summaryrefslogtreecommitdiff
path: root/src/mesa/shader/arbprogparse.c
blob: 12db64612ee4ffa27d0f1822b9264e26e56c830e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
/*
 * Mesa 3-D graphics library
 * Version:  6.5
 *
 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#define DEBUG_PARSING 0

/**
 * \file arbprogparse.c
 * ARB_*_program parser core
 * \author Karl Rasche
 */

#include "glheader.h"
#include "imports.h"
#include "arbprogparse.h"
#include "grammar_mesa.h"
#include "program.h"
#include "context.h"
#include "mtypes.h"
#include "program_instruction.h"


#define MAX_INSTRUCTIONS 256


/**
 * This is basically a union of the vertex_program and fragment_program
 * structs that we can use to parse the program into
 *
 * XXX we can probably get rid of this entirely someday.
 */
struct arb_program
{
   struct program Base;

   GLuint Position;       /* Just used for error reporting while parsing */
   GLuint MajorVersion;
   GLuint MinorVersion;

   /* ARB_vertex_progmra options */
   GLboolean HintPositionInvariant;

   /* ARB_fragment_progmra options */
   GLenum PrecisionOption; /* GL_DONT_CARE, GL_NICEST or GL_FASTEST */
   GLenum FogOption;       /* GL_NONE, GL_LINEAR, GL_EXP or GL_EXP2 */

   /* ARB_fragment_program specifics */
   GLbitfield TexturesUsed[MAX_TEXTURE_IMAGE_UNITS]; 
   GLuint NumAluInstructions; 
   GLuint NumTexInstructions;
   GLuint NumTexIndirections;

   GLboolean UsesKill;
};


#ifndef __extension__
#if !defined(__GNUC__) || (__GNUC__ < 2) || \
    ((__GNUC__ == 2) && (__GNUC_MINOR__ <= 7))
# define __extension__
#endif
#endif

/* TODO:
 *    Fragment Program Stuff:
 *    -----------------------------------------------------
 *
 *    - things from Michal's email
 *       + overflow on atoi
 *       + not-overflowing floats (don't use parse_integer..)
 *       + can remove range checking in arbparse.c
 *
 *    - check all limits of number of various variables
 *      + parameters
 *
 *    - test! test! test!
 *
 *    Vertex Program Stuff:
 *    -----------------------------------------------------
 *    - Optimize param array usage and count limits correctly, see spec,
 *         section 2.14.3.7
 *       + Record if an array is reference absolutly or relatively (or both)
 *       + For absolute arrays, store a bitmap of accesses
 *       + For single parameters, store an access flag
 *       + After parsing, make a parameter cleanup and merging pass, where
 *           relative arrays are layed out first, followed by abs arrays, and
 *           finally single state.
 *       + Remap offsets for param src and dst registers
 *       + Now we can properly count parameter usage
 *
 *    - Multiple state binding errors in param arrays (see spec, just before
 *         section 2.14.3.3)
 *    - grep for XXX
 *
 *    Mesa Stuff
 *    -----------------------------------------------------
 *    - User clipping planes vs. PositionInvariant
 *    - Is it sufficient to just multiply by the mvp to transform in the
 *        PositionInvariant case? Or do we need something more involved?
 *
 *    - vp_src swizzle is GLubyte, fp_src swizzle is GLuint
 *    - fetch state listed in program_parameters list
 *       + WTF should this go???
 *       + currently in nvvertexec.c and s_nvfragprog.c
 *
 *    - allow for multiple address registers (and fetch address regs properly)
 *
 *    Cosmetic Stuff
 *    -----------------------------------------------------
 * 	- remove any leftover unused grammer.c stuff (dict_ ?)
 * 	- fix grammer.c error handling so its not static
 * 	- #ifdef around stuff pertaining to extentions
 *
 *    Outstanding Questions:
 *    -----------------------------------------------------
 *    - ARB_matrix_palette / ARB_vertex_blend -- not supported
 *      what gets hacked off because of this:
 *       + VERTEX_ATTRIB_MATRIXINDEX
 *       + VERTEX_ATTRIB_WEIGHT
 *       + MATRIX_MODELVIEW
 *       + MATRIX_PALETTE
 *
 *    - When can we fetch env/local params from their own register files, and
 *      when to we have to fetch them into the main state register file?
 *      (think arrays)
 *
 *    Grammar Changes:
 *    -----------------------------------------------------
 */

/* Changes since moving the file to shader directory

2004-III-4 ------------------------------------------------------------
- added #include "grammar_mesa.h"
- removed grammar specific code part (it resides now in grammar.c)
- added GL_ARB_fragment_program_shadow tokens
- modified #include "arbparse_syn.h"
- major changes inside _mesa_parse_arb_program()
- check the program string for '\0' characters
- copy the program string to a one-byte-longer location to have
  it null-terminated
- position invariance test (not writing to result.position) moved
  to syntax part
*/

typedef GLubyte *production;

/**
 * This is the text describing the rules to parse the grammar
 */
__extension__ static char arb_grammar_text[] =
#include "arbprogram_syn.h"
;

/**
 * These should match up with the values defined in arbprogram.syn
 */

/*
    Changes:
    - changed and merged V_* and F_* opcode values to OP_*.
    - added GL_ARB_fragment_program_shadow specific tokens (michal)
*/
#define  REVISION                                   0x09

/* program type */
#define  FRAGMENT_PROGRAM                           0x01
#define  VERTEX_PROGRAM                             0x02

/* program section */
#define  OPTION                                     0x01
#define  INSTRUCTION                                0x02
#define  DECLARATION                                0x03
#define  END                                        0x04

/* GL_ARB_fragment_program option */
#define  ARB_PRECISION_HINT_FASTEST                 0x00
#define  ARB_PRECISION_HINT_NICEST                  0x01
#define  ARB_FOG_EXP                                0x02
#define  ARB_FOG_EXP2                               0x03
#define  ARB_FOG_LINEAR                             0x04

/* GL_ARB_vertex_program option */
#define  ARB_POSITION_INVARIANT                     0x05

/* GL_ARB_fragment_program_shadow option */
#define  ARB_FRAGMENT_PROGRAM_SHADOW                0x06

/* GL_ARB_draw_buffers option */
#define  ARB_DRAW_BUFFERS                           0x07

/* GL_ARB_fragment_program instruction class */
#define  OP_ALU_INST                                0x00
#define  OP_TEX_INST                                0x01

/* GL_ARB_vertex_program instruction class */
/*       OP_ALU_INST */

/* GL_ARB_fragment_program instruction type */
#define  OP_ALU_VECTOR                               0x00
#define  OP_ALU_SCALAR                               0x01
#define  OP_ALU_BINSC                                0x02
#define  OP_ALU_BIN                                  0x03
#define  OP_ALU_TRI                                  0x04
#define  OP_ALU_SWZ                                  0x05
#define  OP_TEX_SAMPLE                               0x06
#define  OP_TEX_KIL                                  0x07

/* GL_ARB_vertex_program instruction type */
#define  OP_ALU_ARL                                  0x08
/*       OP_ALU_VECTOR */
/*       OP_ALU_SCALAR */
/*       OP_ALU_BINSC */
/*       OP_ALU_BIN */
/*       OP_ALU_TRI */
/*       OP_ALU_SWZ */

/* GL_ARB_fragment_program instruction code */
#define  OP_ABS                                     0x00
#define  OP_ABS_SAT                                 0x1B
#define  OP_FLR                                     0x09
#define  OP_FLR_SAT                                 0x26
#define  OP_FRC                                     0x0A
#define  OP_FRC_SAT                                 0x27
#define  OP_LIT                                     0x0C
#define  OP_LIT_SAT                                 0x2A
#define  OP_MOV                                     0x11
#define  OP_MOV_SAT                                 0x30
#define  OP_COS                                     0x1F
#define  OP_COS_SAT                                 0x20
#define  OP_EX2                                     0x07
#define  OP_EX2_SAT                                 0x25
#define  OP_LG2                                     0x0B
#define  OP_LG2_SAT                                 0x29
#define  OP_RCP                                     0x14
#define  OP_RCP_SAT                                 0x33
#define  OP_RSQ                                     0x15
#define  OP_RSQ_SAT                                 0x34
#define  OP_SIN                                     0x38
#define  OP_SIN_SAT                                 0x39
#define  OP_SCS                                     0x35
#define  OP_SCS_SAT                                 0x36
#define  OP_POW                                     0x13
#define  OP_POW_SAT                                 0x32
#define  OP_ADD                                     0x01
#define  OP_ADD_SAT                                 0x1C
#define  OP_DP3                                     0x03
#define  OP_DP3_SAT                                 0x21
#define  OP_DP4                                     0x04
#define  OP_DP4_SAT                                 0x22
#define  OP_DPH                                     0x05
#define  OP_DPH_SAT                                 0x23
#define  OP_DST                                     0x06
#define  OP_DST_SAT                                 0x24
#define  OP_MAX                                     0x0F
#define  OP_MAX_SAT                                 0x2E
#define  OP_MIN                                     0x10
#define  OP_MIN_SAT                                 0x2F
#define  OP_MUL                                     0x12
#define  OP_MUL_SAT                                 0x31
#define  OP_SGE                                     0x16
#define  OP_SGE_SAT                                 0x37
#define  OP_SLT                                     0x17
#define  OP_SLT_SAT                                 0x3A
#define  OP_SUB                                     0x18
#define  OP_SUB_SAT                                 0x3B
#define  OP_XPD                                     0x1A
#define  OP_XPD_SAT                                 0x43
#define  OP_CMP                                     0x1D
#define  OP_CMP_SAT                                 0x1E
#define  OP_LRP                                     0x2B
#define  OP_LRP_SAT                                 0x2C
#define  OP_MAD                                     0x0E
#define  OP_MAD_SAT                                 0x2D
#define  OP_SWZ                                     0x19
#define  OP_SWZ_SAT                                 0x3C
#define  OP_TEX                                     0x3D
#define  OP_TEX_SAT                                 0x3E
#define  OP_TXB                                     0x3F
#define  OP_TXB_SAT                                 0x40
#define  OP_TXP                                     0x41
#define  OP_TXP_SAT                                 0x42
#define  OP_KIL                                     0x28

/* GL_ARB_vertex_program instruction code */
#define  OP_ARL                                     0x02
/*       OP_ABS */
/*       OP_FLR */
/*       OP_FRC */
/*       OP_LIT */
/*       OP_MOV */
/*       OP_EX2 */
#define  OP_EXP                                     0x08
/*       OP_LG2 */
#define  OP_LOG                                     0x0D
/*       OP_RCP */
/*       OP_RSQ */
/*       OP_POW */
/*       OP_ADD */
/*       OP_DP3 */
/*       OP_DP4 */
/*       OP_DPH */
/*       OP_DST */
/*       OP_MAX */
/*       OP_MIN */
/*       OP_MUL */
/*       OP_SGE */
/*       OP_SLT */
/*       OP_SUB */
/*       OP_XPD */
/*       OP_MAD */
/*       OP_SWZ */

/* fragment attribute binding */
#define  FRAGMENT_ATTRIB_COLOR                      0x01
#define  FRAGMENT_ATTRIB_TEXCOORD                   0x02
#define  FRAGMENT_ATTRIB_FOGCOORD                   0x03
#define  FRAGMENT_ATTRIB_POSITION                   0x04

/* vertex attribute binding */
#define  VERTEX_ATTRIB_POSITION                     0x01
#define  VERTEX_ATTRIB_WEIGHT                       0x02
#define  VERTEX_ATTRIB_NORMAL                       0x03
#define  VERTEX_ATTRIB_COLOR                        0x04
#define  VERTEX_ATTRIB_FOGCOORD                     0x05
#define  VERTEX_ATTRIB_TEXCOORD                     0x06
#define  VERTEX_ATTRIB_MATRIXINDEX                  0x07
#define  VERTEX_ATTRIB_GENERIC                      0x08

/* fragment result binding */
#define  FRAGMENT_RESULT_COLOR                      0x01
#define  FRAGMENT_RESULT_DEPTH                      0x02

/* vertex result binding */
#define  VERTEX_RESULT_POSITION                     0x01
#define  VERTEX_RESULT_COLOR                        0x02
#define  VERTEX_RESULT_FOGCOORD                     0x03
#define  VERTEX_RESULT_POINTSIZE                    0x04
#define  VERTEX_RESULT_TEXCOORD                     0x05

/* texture target */
#define  TEXTARGET_1D                               0x01
#define  TEXTARGET_2D                               0x02
#define  TEXTARGET_3D                               0x03
#define  TEXTARGET_RECT                             0x04
#define  TEXTARGET_CUBE                             0x05
/* GL_ARB_fragment_program_shadow */
#define  TEXTARGET_SHADOW1D                         0x06
#define  TEXTARGET_SHADOW2D                         0x07
#define  TEXTARGET_SHADOWRECT                       0x08

/* face type */
#define  FACE_FRONT                                 0x00
#define  FACE_BACK                                  0x01

/* color type */
#define  COLOR_PRIMARY                              0x00
#define  COLOR_SECONDARY                            0x01

/* component */
#define  COMPONENT_X                                0x00
#define  COMPONENT_Y                                0x01
#define  COMPONENT_Z                                0x02
#define  COMPONENT_W                                0x03
#define  COMPONENT_0                                0x04
#define  COMPONENT_1                                0x05

/* array index type */
#define  ARRAY_INDEX_ABSOLUTE                       0x00
#define  ARRAY_INDEX_RELATIVE                       0x01

/* matrix name */
#define  MATRIX_MODELVIEW                           0x01
#define  MATRIX_PROJECTION                          0x02
#define  MATRIX_MVP                                 0x03
#define  MATRIX_TEXTURE                             0x04
#define  MATRIX_PALETTE                             0x05
#define  MATRIX_PROGRAM                             0x06

/* matrix modifier */
#define  MATRIX_MODIFIER_IDENTITY                   0x00
#define  MATRIX_MODIFIER_INVERSE                    0x01
#define  MATRIX_MODIFIER_TRANSPOSE                  0x02
#define  MATRIX_MODIFIER_INVTRANS                   0x03

/* constant type */
#define  CONSTANT_SCALAR                            0x01
#define  CONSTANT_VECTOR                            0x02

/* program param type */
#define  PROGRAM_PARAM_ENV                          0x01
#define  PROGRAM_PARAM_LOCAL                        0x02

/* register type */
#define  REGISTER_ATTRIB                            0x01
#define  REGISTER_PARAM                             0x02
#define  REGISTER_RESULT                            0x03
#define  REGISTER_ESTABLISHED_NAME                  0x04

/* param binding */
#define  PARAM_NULL                                 0x00
#define  PARAM_ARRAY_ELEMENT                        0x01
#define  PARAM_STATE_ELEMENT                        0x02
#define  PARAM_PROGRAM_ELEMENT                      0x03
#define  PARAM_PROGRAM_ELEMENTS                     0x04
#define  PARAM_CONSTANT                             0x05

/* param state property */
#define  STATE_MATERIAL_PARSER                      0x01
#define  STATE_LIGHT_PARSER                         0x02
#define  STATE_LIGHT_MODEL                          0x03
#define  STATE_LIGHT_PROD                           0x04
#define  STATE_FOG                                  0x05
#define  STATE_MATRIX_ROWS                          0x06
/* GL_ARB_fragment_program */
#define  STATE_TEX_ENV                              0x07
#define  STATE_DEPTH                                0x08
/* GL_ARB_vertex_program */
#define  STATE_TEX_GEN                              0x09
#define  STATE_CLIP_PLANE                           0x0A
#define  STATE_POINT                                0x0B

/* state material property */
#define  MATERIAL_AMBIENT                           0x01
#define  MATERIAL_DIFFUSE                           0x02
#define  MATERIAL_SPECULAR                          0x03
#define  MATERIAL_EMISSION                          0x04
#define  MATERIAL_SHININESS                         0x05

/* state light property */
#define  LIGHT_AMBIENT                              0x01
#define  LIGHT_DIFFUSE                              0x02
#define  LIGHT_SPECULAR                             0x03
#define  LIGHT_POSITION                             0x04
#define  LIGHT_ATTENUATION                          0x05
#define  LIGHT_HALF                                 0x06
#define  LIGHT_SPOT_DIRECTION                       0x07

/* state light model property */
#define  LIGHT_MODEL_AMBIENT                        0x01
#define  LIGHT_MODEL_SCENECOLOR                     0x02

/* state light product property */
#define  LIGHT_PROD_AMBIENT                         0x01
#define  LIGHT_PROD_DIFFUSE                         0x02
#define  LIGHT_PROD_SPECULAR                        0x03

/* state texture environment property */
#define  TEX_ENV_COLOR                              0x01

/* state texture generation coord property */
#define  TEX_GEN_EYE                                0x01
#define  TEX_GEN_OBJECT                             0x02

/* state fog property */
#define  FOG_COLOR                                  0x01
#define  FOG_PARAMS                                 0x02

/* state depth property */
#define  DEPTH_RANGE                                0x01

/* state point parameters property */
#define  POINT_SIZE                                 0x01
#define  POINT_ATTENUATION                          0x02

/* declaration */
#define  ATTRIB                                     0x01
#define  PARAM                                      0x02
#define  TEMP                                       0x03
#define  OUTPUT                                     0x04
#define  ALIAS                                      0x05
/* GL_ARB_vertex_program */
#define  ADDRESS                                    0x06

/*-----------------------------------------------------------------------
 * From here on down is the semantic checking portion
 *
 */

/**
 * Variable Table Handling functions
 */
typedef enum
{
   vt_none,
   vt_address,
   vt_attrib,
   vt_param,
   vt_temp,
   vt_output,
   vt_alias
} var_type;


/**
 * Setting an explicit field for each of the binding properties is a bit
 * wasteful of space, but it should be much more clear when reading later on..
 */
struct var_cache
{
   const GLubyte *name;         /* don't free() - no need */
   var_type type;
   GLuint address_binding;      /* The index of the address register we should
                                 * be using                                        */
   GLuint attrib_binding;       /* For type vt_attrib, see nvfragprog.h for values */
   GLuint attrib_is_generic;    /* If the attrib was specified through a generic
                                 * vertex attrib                                   */
   GLuint temp_binding;         /* The index of the temp register we are to use    */
   GLuint output_binding;       /* Output/result register number */
   struct var_cache *alias_binding;     /* For type vt_alias, points to the var_cache entry
                                         * that this is aliased to                         */
   GLuint param_binding_type;   /* {PROGRAM_STATE_VAR, PROGRAM_LOCAL_PARAM,
                                 *    PROGRAM_ENV_PARAM}                           */
   GLuint param_binding_begin;  /* This is the offset into the program_parameter_list where
                                 * the tokens representing our bound state (or constants)
                                 * start */
   GLuint param_binding_length; /* This is how many entries in the the program_parameter_list
                                 * we take up with our state tokens or constants. Note that
                                 * this is _not_ the same as the number of param registers
                                 * we eventually use */
   struct var_cache *next;
};

static GLvoid
var_cache_create (struct var_cache **va)
{
   *va = (struct var_cache *) _mesa_malloc (sizeof (struct var_cache));
   if (*va) {
      (**va).name = NULL;
      (**va).type = vt_none;
      (**va).attrib_binding = ~0;
      (**va).attrib_is_generic = 0;
      (**va).temp_binding = ~0;
      (**va).output_binding = ~0;
      (**va).param_binding_type = ~0;
      (**va).param_binding_begin = ~0;
      (**va).param_binding_length = ~0;
      (**va).alias_binding = NULL;
      (**va).next = NULL;
   }
}

static GLvoid
var_cache_destroy (struct var_cache **va)
{
   if (*va) {
      var_cache_destroy (&(**va).next);
      _mesa_free (*va);
      *va = NULL;
   }
}

static GLvoid
var_cache_append (struct var_cache **va, struct var_cache *nv)
{
   if (*va)
      var_cache_append (&(**va).next, nv);
   else
      *va = nv;
}

static struct var_cache *
var_cache_find (struct var_cache *va, GLubyte * name)
{
   /*struct var_cache *first = va;*/

   while (va) {
      if (!_mesa_strcmp ( (const char*) name, (const char*) va->name)) {
         if (va->type == vt_alias)
            return va->alias_binding;
         return va;
      }

      va = va->next;
   }

   return NULL;
}

/**
 * constructs an integer from 4 GLubytes in LE format
 */
static GLuint
parse_position (GLubyte ** inst)
{
   GLuint value;

   value =  (GLuint) (*(*inst)++);
   value += (GLuint) (*(*inst)++) * 0x100;
   value += (GLuint) (*(*inst)++) * 0x10000;
   value += (GLuint) (*(*inst)++) * 0x1000000;

   return value;
}

/**
 * This will, given a string, lookup the string as a variable name in the
 * var cache. If the name is found, the var cache node corresponding to the
 * var name is returned. If it is not found, a new entry is allocated
 *
 * \param  I     Points into the binary array where the string identifier begins
 * \param  found 1 if the string was found in the var_cache, 0 if it was allocated
 * \return       The location on the var_cache corresponding the the string starting at I
 */
static struct var_cache *
parse_string (GLubyte ** inst, struct var_cache **vc_head,
              struct arb_program *Program, GLuint * found)
{
   GLubyte *i = *inst;
   struct var_cache *va = NULL;
   (void) Program;

   *inst += _mesa_strlen ((char *) i) + 1;

   va = var_cache_find (*vc_head, i);

   if (va) {
      *found = 1;
      return va;
   }

   *found = 0;
   var_cache_create (&va);
   va->name = (const GLubyte *) i;

   var_cache_append (vc_head, va);

   return va;
}

static char *
parse_string_without_adding (GLubyte ** inst, struct arb_program *Program)
{
   GLubyte *i = *inst;
   (void) Program;
   
   *inst += _mesa_strlen ((char *) i) + 1;

   return (char *) i;
}

/**
 * \return -1 if we parse '-', return 1 otherwise
 */
static GLint
parse_sign (GLubyte ** inst)
{
   /*return *(*inst)++ != '+'; */

   if (**inst == '-') {
      (*inst)++;
      return -1;
   }
   else if (**inst == '+') {
      (*inst)++;
      return 1;
   }

   return 1;
}

/**
 * parses and returns signed integer
 */
static GLint
parse_integer (GLubyte ** inst, struct arb_program *Program)
{
   GLint sign;
   GLint value;

   /* check if *inst points to '+' or '-'
    * if yes, grab the sign and increment *inst
    */
   sign = parse_sign (inst);

   /* now check if *inst points to 0
    * if yes, increment the *inst and return the default value
    */
   if (**inst == 0) {
      (*inst)++;
      return 0;
   }

   /* parse the integer as you normally would do it */
   value = _mesa_atoi (parse_string_without_adding (inst, Program));

   /* now, after terminating 0 there is a position
    * to parse it - parse_position()
    */
   Program->Position = parse_position (inst);

   return value * sign;
}

/**
  Accumulate this string of digits, and return them as 
  a large integer represented in floating point (for range).
  If scale is not NULL, also accumulates a power-of-ten
  integer scale factor that represents the number of digits 
  in the string.
*/
static GLdouble
parse_float_string(GLubyte ** inst, struct arb_program *Program, GLdouble *scale)
{
   GLdouble value = 0.0;
   GLdouble oscale = 1.0;

   if (**inst == 0) { /* this string of digits is empty-- do nothing */
      (*inst)++;
   }
   else { /* nonempty string-- parse out the digits */
      while (**inst >= '0' && **inst <= '9') {
         GLubyte digit = *((*inst)++);
         value = value * 10.0 + (GLint) (digit - '0');
         oscale *= 10.0;
      }
      assert(**inst == 0); /* integer string should end with 0 */
      (*inst)++; /* skip over terminating 0 */
      Program->Position = parse_position(inst); /* skip position (from integer) */
   }
   if (scale)
      *scale = oscale;
   return value;
}

/**
  Parse an unsigned floating-point number from this stream of tokenized
  characters.  Example floating-point formats supported:
     12.34
     12
     0.34
     .34
     12.34e-4
 */
static GLfloat
parse_float (GLubyte ** inst, struct arb_program *Program)
{
   GLint exponent;
   GLdouble whole, fraction, fracScale = 1.0;

   whole = parse_float_string(inst, Program, 0);
   fraction = parse_float_string(inst, Program, &fracScale);
   
   /* Parse signed exponent */
   exponent = parse_integer(inst, Program);   /* This is the exponent */

   /* Assemble parts of floating-point number: */
   return (GLfloat) ((whole + fraction / fracScale) *
                     _mesa_pow(10.0, (GLfloat) exponent));
}


/**
 */
static GLfloat
parse_signed_float (GLubyte ** inst, struct arb_program *Program)
{
   GLint sign = parse_sign (inst);
   GLfloat value = parse_float (inst, Program);
   return value * sign;
}

/**
 * This picks out a constant value from the parsed array. The constant vector is r
 * returned in the *values array, which should be of length 4.
 *
 * \param values - The 4 component vector with the constant value in it
 */
static GLvoid
parse_constant (GLubyte ** inst, GLfloat *values, struct arb_program *Program,
                GLboolean use)
{
   GLuint components, i;


   switch (*(*inst)++) {
      case CONSTANT_SCALAR:
         if (use == GL_TRUE) {
            values[0] =
               values[1] =
               values[2] = values[3] = parse_float (inst, Program);
         }
         else {
            values[0] =
               values[1] =
               values[2] = values[3] = parse_signed_float (inst, Program);
         }

         break;
      case CONSTANT_VECTOR:
         values[0] = values[1] = values[2] = 0;
         values[3] = 1;
         components = *(*inst)++;
         for (i = 0; i < components; i++) {
            values[i] = parse_signed_float (inst, Program);
         }
         break;
   }
}

/**
 * \param offset The offset from the address register that we should
 *                address
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_relative_offset (GLcontext *ctx, GLubyte **inst, struct arb_program *Program,
                        GLint *offset)
{
   (void) ctx;
   *offset = parse_integer(inst, Program);
   return 0;
}

/**
 * \param  color 0 if color type is primary, 1 if color type is secondary
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_color_type (GLcontext * ctx, GLubyte ** inst, struct arb_program *Program,
                  GLint * color)
{
   (void) ctx; (void) Program;
   *color = *(*inst)++ != COLOR_PRIMARY;
   return 0;
}

/**
 * Get an integer corresponding to a generic vertex attribute.
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_generic_attrib_num(GLcontext *ctx, GLubyte ** inst,
                       struct arb_program *Program, GLuint *attrib)
{
   GLint i = parse_integer(inst, Program);

   if ((i < 0) || (i >= MAX_VERTEX_PROGRAM_ATTRIBS))
   {
      _mesa_set_program_error (ctx, Program->Position,
                               "Invalid generic vertex attribute index");
      _mesa_error (ctx, GL_INVALID_OPERATION, "Invalid generic vertex attribute index");

      return 1;
   }

   *attrib = (GLuint) i;

   return 0;
}


/**
 * \param color The index of the color buffer to write into
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_output_color_num (GLcontext * ctx, GLubyte ** inst,
                    struct arb_program *Program, GLuint * color)
{
   GLint i = parse_integer (inst, Program);

   if ((i < 0) || (i >= (int)ctx->Const.MaxDrawBuffers)) {
      _mesa_set_program_error (ctx, Program->Position,
                               "Invalid draw buffer index");
      _mesa_error (ctx, GL_INVALID_OPERATION, "Invalid draw buffer index");
      return 1;
   }

   *color = (GLuint) i;
   return 0;
}


/**
 * \param coord The texture unit index
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_texcoord_num (GLcontext * ctx, GLubyte ** inst,
                    struct arb_program *Program, GLuint * coord)
{
   GLint i = parse_integer (inst, Program);

   if ((i < 0) || (i >= (int)ctx->Const.MaxTextureUnits)) {
      _mesa_set_program_error (ctx, Program->Position,
                               "Invalid texture unit index");
      _mesa_error (ctx, GL_INVALID_OPERATION, "Invalid texture unit index");
      return 1;
   }

   *coord = (GLuint) i;
   return 0;
}

/**
 * \param coord The weight index
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_weight_num (GLcontext * ctx, GLubyte ** inst, struct arb_program *Program,
                  GLint * coord)
{
   *coord = parse_integer (inst, Program);

   if ((*coord < 0) || (*coord >= 1)) {
      _mesa_set_program_error (ctx, Program->Position,
                               "Invalid weight index");
      _mesa_error (ctx, GL_INVALID_OPERATION, "Invalid weight index");
      return 1;
   }

   return 0;
}

/**
 * \param coord The clip plane index
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_clipplane_num (GLcontext * ctx, GLubyte ** inst,
                     struct arb_program *Program, GLint * coord)
{
   *coord = parse_integer (inst, Program);

   if ((*coord < 0) || (*coord >= (GLint) ctx->Const.MaxClipPlanes)) {
      _mesa_set_program_error (ctx, Program->Position,
                               "Invalid clip plane index");
      _mesa_error (ctx, GL_INVALID_OPERATION, "Invalid clip plane index");
      return 1;
   }

   return 0;
}


/**
 * \return 0 on front face, 1 on back face
 */
static GLuint
parse_face_type (GLubyte ** inst)
{
   switch (*(*inst)++) {
      case FACE_FRONT:
         return 0;

      case FACE_BACK:
         return 1;
   }
   return 0;
}


/**
 * Given a matrix and a modifier token on the binary array, return tokens
 * that _mesa_fetch_state() [program.c] can understand.
 *
 * \param matrix - the matrix we are talking about
 * \param matrix_idx - the index of the matrix we have (for texture & program matricies)
 * \param matrix_modifier - the matrix modifier (trans, inv, etc)
 * \return 0 on sucess, 1 on failure
 */
static GLuint
parse_matrix (GLcontext * ctx, GLubyte ** inst, struct arb_program *Program,
              GLint * matrix, GLint * matrix_idx, GLint * matrix_modifier)
{
   GLubyte mat = *(*inst)++;

   *matrix_idx = 0;

   switch (mat) {
      case MATRIX_MODELVIEW:
         *matrix = STATE_MODELVIEW;
         *matrix_idx = parse_integer (inst, Program);
         if (*matrix_idx > 0) {
            _mesa_set_program_error (ctx, Program->Position,
               "ARB_vertex_blend not supported\n");
            _mesa_error (ctx, GL_INVALID_OPERATION,
               "ARB_vertex_blend not supported\n");
            return 1;
         }
         break;

      case MATRIX_PROJECTION:
         *matrix = STATE_PROJECTION;
         break;

      case MATRIX_MVP:
         *matrix = STATE_MVP;
         break;

      case MATRIX_TEXTURE:
         *matrix = STATE_TEXTURE;
         *matrix_idx = parse_integer (inst, Program);
         if (*matrix_idx >= (GLint) ctx->Const.MaxTextureUnits) {
            _mesa_set_program_error (ctx, Program->Position,
                                     "Invalid Texture Unit");
            _mesa_error (ctx, GL_INVALID_OPERATION,
                         "Invalid Texture Unit: %d", *matrix_idx);
            return 1;
         }
         break;

         /* This is not currently supported (ARB_matrix_palette) */
      case MATRIX_PALETTE:
         *matrix_idx = parse_integer (inst, Program);
         _mesa_set_program_error (ctx, Program->Position,
              "ARB_matrix_palette not supported\n");
         _mesa_error (ctx, GL_INVALID_OPERATION,
              "ARB_matrix_palette not supported\n");
         return 1;
         break;

      case MATRIX_PROGRAM:
         *matrix = STATE_PROGRAM;
         *matrix_idx = parse_integer (inst, Program);
         if (*matrix_idx >= (GLint) ctx->Const.MaxProgramMatrices) {
            _mesa_set_program_error (ctx, Program->Position,
                                     "Invalid Program Matrix");
            _mesa_error (ctx, GL_INVALID_OPERATION,
                         "Invalid Program Matrix: %d", *matrix_idx);
            return 1;
         }
         break;
   }

   switch (*(*inst)++) {
      case MATRIX_MODIFIER_IDENTITY:
         *matrix_modifier = 0;
         break;
      case MATRIX_MODIFIER_INVERSE:
         *matrix_modifier = STATE_MATRIX_INVERSE;
         break;
      case MATRIX_MODIFIER_TRANSPOSE:
         *matrix_modifier = STATE_MATRIX_TRANSPOSE;
         break;
      case MATRIX_MODIFIER_INVTRANS:
         *matrix_modifier = STATE_MATRIX_INVTRANS;
         break;
   }

   return 0;
}


/**
 * This parses a state string (rather, the binary version of it) into
 * a 6-token sequence as described in _mesa_fetch_state() [program.c]
 *
 * \param inst         - the start in the binary arry to start working from
 * \param state_tokens - the storage for the 6-token state description
 * \return             - 0 on sucess, 1 on error
 */
static GLuint
parse_state_single_item (GLcontext * ctx, GLubyte ** inst,
                         struct arb_program *Program, GLint * state_tokens)
{
   switch (*(*inst)++) {
      case STATE_MATERIAL_PARSER:
         state_tokens[0] = STATE_MATERIAL;
         state_tokens[1] = parse_face_type (inst);
         switch (*(*inst)++) {
            case MATERIAL_AMBIENT:
               state_tokens[2] = STATE_AMBIENT;
               break;
            case MATERIAL_DIFFUSE:
               state_tokens[2] = STATE_DIFFUSE;
               break;
            case MATERIAL_SPECULAR:
               state_tokens[2] = STATE_SPECULAR;
               break;
            case MATERIAL_EMISSION:
               state_tokens[2] = STATE_EMISSION;
	       break;
            case MATERIAL_SHININESS:
               state_tokens[2] = STATE_SHININESS;
               break;
         }
         break;

      case STATE_LIGHT_PARSER:
         state_tokens[0] = STATE_LIGHT;
         state_tokens[1] = parse_integer (inst, Program);

         /* Check the value of state_tokens[1] against the # of lights */
         if (state_tokens[1] >= (GLint) ctx->Const.MaxLights) {
            _mesa_set_program_error (ctx, Program->Position,
                                     "Invalid Light Number");
            _mesa_error (ctx, GL_INVALID_OPERATION,
                         "Invalid Light Number: %d", state_tokens[1]);
            return 1;
         }

         switch (*(*inst)++) {
            case LIGHT_AMBIENT:
               state_tokens[2] = STATE_AMBIENT;
               break;
            case LIGHT_DIFFUSE:
               state_tokens[2] = STATE_DIFFUSE;
               break;
            case LIGHT_SPECULAR:
               state_tokens[2] = STATE_SPECULAR;
               break;
            case LIGHT_POSITION:
               state_tokens[2] = STATE_POSITION;
               break;
            case LIGHT_ATTENUATION:
               state_tokens[2] = STATE_ATTENUATION;
               break;
            case LIGHT_HALF:
               state_tokens[2] = STATE_HALF;
               break;
            case LIGHT_SPOT_DIRECTION:
               state_tokens[2] = STATE_SPOT_DIRECTION;
               break;
         }
         break;

      case STATE_LIGHT_MODEL:
         switch (*(*inst)++) {
            case LIGHT_MODEL_AMBIENT:
               state_tokens[0] = STATE_LIGHTMODEL_AMBIENT;
               break;
            case LIGHT_MODEL_SCENECOLOR:
               state_tokens[0] = STATE_LIGHTMODEL_SCENECOLOR;
               state_tokens[1] = parse_face_type (inst);
               break;
         }
         break;

      case STATE_LIGHT_PROD:
         state_tokens[0] = STATE_LIGHTPROD;
         state_tokens[1] = parse_integer (inst, Program);

         /* Check the value of state_tokens[1] against the # of lights */
         if (state_tokens[1] >= (GLint) ctx->Const.MaxLights) {
            _mesa_set_program_error (ctx, Program->Position,
                                     "Invalid Light Number");
            _mesa_error (ctx, GL_INVALID_OPERATION,
                         "Invalid Light Number: %d", state_tokens[1]);
            return 1;
         }

         state_tokens[2] = parse_face_type (inst);
         switch (*(*inst)++) {
            case LIGHT_PROD_AMBIENT:
               state_tokens[3] = STATE_AMBIENT;
               break;
            case LIGHT_PROD_DIFFUSE:
               state_tokens[3] = STATE_DIFFUSE;
               break;
            case LIGHT_PROD_SPECULAR:
               state_tokens[3] = STATE_SPECULAR;
               break;
         }
         break;


      case STATE_FOG:
         switch (*(*inst)++) {
            case FOG_COLOR:
               state_tokens[0] = STATE_FOG_COLOR;
               break;
            case FOG_PARAMS:
               state_tokens[0] = STATE_FOG_PARAMS;
               break;
         }
         break;

      case STATE_TEX_ENV:
         state_tokens[1] = parse_integer (inst, Program);
         switch (*(*inst)++) {
            case TEX_ENV_COLOR:
               state_tokens[0] = STATE_TEXENV_COLOR;
               break;
         }
         break;

      case STATE_TEX_GEN:
         {
            GLuint type, coord;

            state_tokens[0] = STATE_TEXGEN;
            /*state_tokens[1] = parse_integer (inst, Program);*/    /* Texture Unit */

            if (parse_texcoord_num (ctx, inst, Program, &coord))
               return 1;
	    state_tokens[1] = coord;

            /* EYE or OBJECT */
            type = *(*inst++);

            /* 0 - s, 1 - t, 2 - r, 3 - q */
            coord = *(*inst++);

            if (type == TEX_GEN_EYE) {
               switch (coord) {
                  case COMPONENT_X:
                     state_tokens[2] = STATE_TEXGEN_EYE_S;
                     break;
                  case COMPONENT_Y:
                     state_tokens[2] = STATE_TEXGEN_EYE_T;
                     break;
                  case COMPONENT_Z:
                     state_tokens[2] = STATE_TEXGEN_EYE_R;
                     break;
                  case COMPONENT_W:
                     state_tokens[2] = STATE_TEXGEN_EYE_Q;
                     break;
               }
            }
            else {
               switch (coord) {
                  case COMPONENT_X:
                     state_tokens[2] = STATE_TEXGEN_OBJECT_S;
                     break;
                  case COMPONENT_Y:
                     state_tokens[2] = STATE_TEXGEN_OBJECT_T;
                     break;
                  case COMPONENT_Z:
                     state_tokens[2] = STATE_TEXGEN_OBJECT_R;
                     break;
                  case COMPONENT_W:
                     state_tokens[2] = STATE_TEXGEN_OBJECT_Q;
                     break;
               }
            }
         }
         break;

      case STATE_DEPTH:
         switch (*(*inst)++) {
            case DEPTH_RANGE:
               state_tokens[0] = STATE_DEPTH_RANGE;
               break;
         }
         break;

      case STATE_CLIP_PLANE:
         state_tokens[0] = STATE_CLIPPLANE;
         state_tokens[1] = parse_integer (inst, Program);
         if (parse_clipplane_num (ctx, inst, Program, &state_tokens[1]))
            return 1;
         break;

      case STATE_POINT:
         switch (*(*inst++)) {
            case POINT_SIZE:
               state_tokens[0] = STATE_POINT_SIZE;
               break;

            case POINT_ATTENUATION:
               state_tokens[0] = STATE_POINT_ATTENUATION;
               break;
         }
         break;

         /* XXX: I think this is the correct format for a matrix row */
      case STATE_MATRIX_ROWS:
         state_tokens[0] = STATE_MATRIX;
         if (parse_matrix
             (ctx, inst, Program, &state_tokens[1], &state_tokens[2],
              &state_tokens[5]))
            return 1;

         state_tokens[3] = parse_integer (inst, Program);       /* The first row to grab */

         if ((**inst) != 0) {                                   /* Either the last row, 0 */
            state_tokens[4] = parse_integer (inst, Program);
            if (state_tokens[4] < state_tokens[3]) {
               _mesa_set_program_error (ctx, Program->Position,
                     "Second matrix index less than the first");
               _mesa_error (ctx, GL_INVALID_OPERATION,
                     "Second matrix index (%d) less than the first (%d)",
                     state_tokens[4], state_tokens[3]);
               return 1;
            }
         }
         else {
            state_tokens[4] = state_tokens[3];
            (*inst)++;
         }
         break;
   }

   return 0;
}

/**
 * This parses a state string (rather, the binary version of it) into
 * a 6-token similar for the state fetching code in program.c
 *
 * One might ask, why fetch these parameters into just like  you fetch
 * state when they are already stored in other places?
 *
 * Because of array offsets -> We can stick env/local parameters in the
 * middle of a parameter array and then index someplace into the array
 * when we execute.
 *
 * One optimization might be to only do this for the cases where the
 * env/local parameters end up inside of an array, and leave the
 * single parameters (or arrays of pure env/local pareameters) in their
 * respective register files.
 *
 * For ENV parameters, the format is:
 *    state_tokens[0] = STATE_FRAGMENT_PROGRAM / STATE_VERTEX_PROGRAM
 *    state_tokens[1] = STATE_ENV
 *    state_tokens[2] = the parameter index
 *
 * for LOCAL parameters, the format is:
 *    state_tokens[0] = STATE_FRAGMENT_PROGRAM / STATE_VERTEX_PROGRAM
 *    state_tokens[1] = STATE_LOCAL
 *    state_tokens[2] = the parameter index
 *
 * \param inst         - the start in the binary arry to start working from
 * \param state_tokens - the storage for the 6-token state description
 * \return             - 0 on sucess, 1 on failure
 */
static GLuint
parse_program_single_item (GLcontext * ctx, GLubyte ** inst,
                           struct arb_program *Program, GLint * state_tokens)
{
   if (Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB)
      state_tokens[0] = STATE_FRAGMENT_PROGRAM;
   else
      state_tokens[0] = STATE_VERTEX_PROGRAM;


   switch (*(*inst)++) {
      case PROGRAM_PARAM_ENV:
         state_tokens[1] = STATE_ENV;
         state_tokens[2] = parse_integer (inst, Program);

         /* Check state_tokens[2] against the number of ENV parameters available */
         if (((Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) &&
              (state_tokens[2] >= (GLint) ctx->Const.FragmentProgram.MaxEnvParams))
             ||
             ((Program->Base.Target == GL_VERTEX_PROGRAM_ARB) &&
              (state_tokens[2] >= (GLint) ctx->Const.VertexProgram.MaxEnvParams))) {
            _mesa_set_program_error (ctx, Program->Position,
                                     "Invalid Program Env Parameter");
            _mesa_error (ctx, GL_INVALID_OPERATION,
                         "Invalid Program Env Parameter: %d",
                         state_tokens[2]);
            return 1;
         }

         break;

      case PROGRAM_PARAM_LOCAL:
         state_tokens[1] = STATE_LOCAL;
         state_tokens[2] = parse_integer (inst, Program);

         /* Check state_tokens[2] against the number of LOCAL parameters available */
         if (((Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) &&
              (state_tokens[2] >= (GLint) ctx->Const.FragmentProgram.MaxLocalParams))
             ||
             ((Program->Base.Target == GL_VERTEX_PROGRAM_ARB) &&
              (state_tokens[2] >= (GLint) ctx->Const.VertexProgram.MaxLocalParams))) {
            _mesa_set_program_error (ctx, Program->Position,
                                     "Invalid Program Local Parameter");
            _mesa_error (ctx, GL_INVALID_OPERATION,
                         "Invalid Program Local Parameter: %d",
                         state_tokens[2]);
            return 1;
         }
         break;
   }

   return 0;
}

/**
 * For ARB_vertex_program, programs are not allowed to use both an explicit
 * vertex attribute and a generic vertex attribute corresponding to the same
 * state. See section 2.14.3.1 of the GL_ARB_vertex_program spec.
 *
 * This will walk our var_cache and make sure that nobody does anything fishy.
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
generic_attrib_check(struct var_cache *vc_head)
{
   int a;
   struct var_cache *curr;
   GLboolean explicitAttrib[MAX_VERTEX_PROGRAM_ATTRIBS],
      genericAttrib[MAX_VERTEX_PROGRAM_ATTRIBS];

   for (a=0; a<MAX_VERTEX_PROGRAM_ATTRIBS; a++) {
      explicitAttrib[a] = GL_FALSE;
      genericAttrib[a] = GL_FALSE;
   }

   curr = vc_head;
   while (curr) {
      if (curr->type == vt_attrib) {
         if (curr->attrib_is_generic)
            genericAttrib[ curr->attrib_binding ] = GL_TRUE;
         else
            explicitAttrib[ curr->attrib_binding ] = GL_TRUE;
      }

      curr = curr->next;
   }

   for (a=0; a<MAX_VERTEX_PROGRAM_ATTRIBS; a++) {
      if ((explicitAttrib[a]) && (genericAttrib[a]))
         return 1;
   }

   return 0;
}

/**
 * This will handle the binding side of an ATTRIB var declaration
 *
 * \param inputReg  returns the input register index, one of the
 *                  VERT_ATTRIB_* or FRAG_ATTRIB_* values.
 * \return returns 0 on sucess, 1 on error
 */
static GLuint
parse_attrib_binding(GLcontext * ctx, GLubyte ** inst,
                     struct arb_program *Program,
                     GLuint *inputReg, GLuint *is_generic)
{
   GLint err = 0;

   *is_generic = 0;

   if (Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
      switch (*(*inst)++) {
         case FRAGMENT_ATTRIB_COLOR:
            {
               GLint coord;
               err = parse_color_type (ctx, inst, Program, &coord);
               *inputReg = FRAG_ATTRIB_COL0 + coord;
            }
            break;
         case FRAGMENT_ATTRIB_TEXCOORD:
            {
               GLuint texcoord;
               err = parse_texcoord_num (ctx, inst, Program, &texcoord);
               *inputReg = FRAG_ATTRIB_TEX0 + texcoord;
            }
            break;
         case FRAGMENT_ATTRIB_FOGCOORD:
            *inputReg = FRAG_ATTRIB_FOGC;
            break;
         case FRAGMENT_ATTRIB_POSITION:
            *inputReg = FRAG_ATTRIB_WPOS;
            break;
         default:
            err = 1;
            break;
      }
   }
   else {
      switch (*(*inst)++) {
         case VERTEX_ATTRIB_POSITION:
            *inputReg = VERT_ATTRIB_POS;
            break;

         case VERTEX_ATTRIB_WEIGHT:
            {
               const char *msg = "ARB_vertex_blend not supported";
               GLint weight;
               err = parse_weight_num (ctx, inst, Program, &weight);
               *inputReg = VERT_ATTRIB_WEIGHT;
               _mesa_set_program_error(ctx, Program->Position, msg);
               _mesa_error(ctx, GL_INVALID_OPERATION, msg);
            }
            return 1;

         case VERTEX_ATTRIB_NORMAL:
            *inputReg = VERT_ATTRIB_NORMAL;
            break;

         case VERTEX_ATTRIB_COLOR:
            {
               GLint color;
               err = parse_color_type (ctx, inst, Program, &color);
               if (color) {
                  *inputReg = VERT_ATTRIB_COLOR1;
               }
               else {
                  *inputReg = VERT_ATTRIB_COLOR0;
               }
            }
            break;

         case VERTEX_ATTRIB_FOGCOORD:
            *inputReg = VERT_ATTRIB_FOG;
            break;

         case VERTEX_ATTRIB_TEXCOORD:
            {
               GLuint unit;
               err = parse_texcoord_num (ctx, inst, Program, &unit);
               *inputReg = VERT_ATTRIB_TEX0 + unit;
            }
            break;

         case VERTEX_ATTRIB_MATRIXINDEX:
            /* Not supported at this time */
            {
               const char *msg = "ARB_palette_matrix not supported";
               parse_integer (inst, Program);
               _mesa_set_program_error (ctx, Program->Position, msg);
               _mesa_error (ctx, GL_INVALID_OPERATION, msg);
            }
            return 1;

         case VERTEX_ATTRIB_GENERIC:
            {
               GLuint attrib;

               err = parse_generic_attrib_num(ctx, inst, Program, &attrib);

			   if (!err) {
                  *is_generic = 1;
                  /* Add VERT_ATTRIB_GENERIC0 here because ARB_vertex_program's
                   * attributes do not alias the conventional vertex
                   * attributes.
                   */
                  if (attrib > 0)
                     *inputReg = attrib + VERT_ATTRIB_GENERIC0;
                  else
                     *inputReg = 0;
               }
            }
            break;

         default:
            err = 1;
            break;
      }
   }

   if (err) {
      const char *msg = "Bad attribute binding";
      _mesa_set_program_error(ctx, Program->Position, msg);
      _mesa_error(ctx, GL_INVALID_OPERATION, msg);
   }

   Program->Base.InputsRead |= (1 << *inputReg);

   return err;
}


/**
 * This translates between a binary token for an output variable type
 * and the mesa token for the same thing.
 *
 * \param inst       The parsed tokens
 * \param outputReg  Returned index/number of the output register,
 *                   one of the VERT_RESULT_* or FRAG_RESULT_* values.
 */
static GLuint
parse_result_binding(GLcontext *ctx, GLubyte **inst,
                     GLuint *outputReg, struct arb_program *Program)
{
   const GLubyte token = *(*inst)++;

   switch (token) {
      case FRAGMENT_RESULT_COLOR:
         if (Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
            GLuint out_color;

            /* This gets result of the color buffer we're supposed to 
             * draw into.  This pertains to GL_ARB_draw_buffers.
             */
            parse_output_color_num(ctx, inst, Program, &out_color);
            ASSERT(out_color < MAX_DRAW_BUFFERS);
            *outputReg = FRAG_RESULT_COLR;
         }
         else {
            /* for vtx programs, this is VERTEX_RESULT_POSITION */
            *outputReg = VERT_RESULT_HPOS;
         }
         break;

      case FRAGMENT_RESULT_DEPTH:
         if (Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
            /* for frag programs, this is FRAGMENT_RESULT_DEPTH */
            *outputReg = FRAG_RESULT_DEPR;
         }
         else {
            /* for vtx programs, this is VERTEX_RESULT_COLOR */
            GLint color_type;
            GLuint face_type = parse_face_type(inst);
	    GLint err = parse_color_type(ctx, inst, Program, &color_type);
            if (err)
               return 1;

            if (face_type) {
               /* back face */
               if (color_type) {
                  *outputReg = VERT_RESULT_BFC1; /* secondary color */
               }
               else {
                  *outputReg = VERT_RESULT_BFC0; /* primary color */
               }
            }
            else {
               /* front face */
               if (color_type) {
                  *outputReg = VERT_RESULT_COL1; /* secondary color */
               }
               /* primary color */
               else {
                  *outputReg = VERT_RESULT_COL0; /* primary color */
               }
            }
         }
         break;

      case VERTEX_RESULT_FOGCOORD:
         *outputReg = VERT_RESULT_FOGC;
         break;

      case VERTEX_RESULT_POINTSIZE:
         *outputReg = VERT_RESULT_PSIZ;
         break;

      case VERTEX_RESULT_TEXCOORD:
         {
            GLuint unit;
            if (parse_texcoord_num (ctx, inst, Program, &unit))
               return 1;
            *outputReg = VERT_RESULT_TEX0 + unit;
         }
         break;
   }

   Program->Base.OutputsWritten |= (1 << *outputReg);

   return 0;
}


/**
 * This handles the declaration of ATTRIB variables
 *
 * XXX: Still needs
 *      parse_vert_attrib_binding(), or something like that
 *
 * \return 0 on sucess, 1 on error
 */
static GLint
parse_attrib (GLcontext * ctx, GLubyte ** inst, struct var_cache **vc_head,
              struct arb_program *Program)
{
   GLuint found;
   char *error_msg;
   struct var_cache *attrib_var;

   attrib_var = parse_string (inst, vc_head, Program, &found);
   Program->Position = parse_position (inst);
   if (found) {
      error_msg = (char *)
         _mesa_malloc (_mesa_strlen ((char *) attrib_var->name) + 40);
      _mesa_sprintf (error_msg, "Duplicate Varible Declaration: %s",
                     attrib_var->name);

      _mesa_set_program_error (ctx, Program->Position, error_msg);
      _mesa_error (ctx, GL_INVALID_OPERATION, error_msg);

      _mesa_free (error_msg);
      return 1;
   }

   attrib_var->type = vt_attrib;

   if (parse_attrib_binding(ctx, inst, Program, &attrib_var->attrib_binding,
                            &attrib_var->attrib_is_generic))
      return 1;

   if (generic_attrib_check(*vc_head)) {
      _mesa_set_program_error(ctx, Program->Position,
                              "Cannot use both a generic vertex attribute "
                              "and a specific attribute of the same type");
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "Cannot use both a generic vertex attribute and a specific "
                  "attribute of the same type");
      return 1;
   }

   Program->Base.NumAttributes++;
   return 0;
}

/**
 * \param use -- TRUE if we're called when declaring implicit parameters,
 *               FALSE if we're declaraing variables. This has to do with
 *               if we get a signed or unsigned float for scalar constants
 */
static GLuint
parse_param_elements (GLcontext * ctx, GLubyte ** inst,
                      struct var_cache *param_var,
                      struct arb_program *Program, GLboolean use)
{
   GLint idx;
   GLuint err = 0;
   GLint state_tokens[6];
   GLfloat const_values[4];

   switch (*(*inst)++) {
      case PARAM_STATE_ELEMENT:
         if (parse_state_single_item (ctx, inst, Program, state_tokens))
            return 1;

         /* If we adding STATE_MATRIX that has multiple rows, we need to
          * unroll it and call _mesa_add_state_reference() for each row
          */
         if ((state_tokens[0] == STATE_MATRIX)
             && (state_tokens[3] != state_tokens[4])) {
            GLint row;
            GLint first_row = state_tokens[3];
            GLint last_row = state_tokens[4];

            for (row = first_row; row <= last_row; row++) {
               state_tokens[3] = state_tokens[4] = row;

               idx = _mesa_add_state_reference(Program->Base.Parameters,
                                               state_tokens);
               if (param_var->param_binding_begin == ~0U)
                  param_var->param_binding_begin = idx;
               param_var->param_binding_length++;
               Program->Base.NumParameters++;
            }
         }
         else {
            idx = _mesa_add_state_reference(Program->Base.Parameters,
                                            state_tokens);
            if (param_var->param_binding_begin == ~0U)
               param_var->param_binding_begin = idx;
            param_var->param_binding_length++;
            Program->Base.NumParameters++;
         }
         break;

      case PARAM_PROGRAM_ELEMENT:
         if (parse_program_single_item (ctx, inst, Program, state_tokens))
            return 1;
         idx = _mesa_add_state_reference (Program->Base.Parameters, state_tokens);
         if (param_var->param_binding_begin == ~0U)
            param_var->param_binding_begin = idx;
         param_var->param_binding_length++;
         Program->Base.NumParameters++;

         /* Check if there is more: 0 -> we're done, else its an integer */
         if (**inst) {
            GLuint out_of_range, new_idx;
            GLuint start_idx = state_tokens[2] + 1;
            GLuint end_idx = parse_integer (inst, Program);

            out_of_range = 0;
            if (Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
               if (((state_tokens[1] == STATE_ENV)
                    && (end_idx >= ctx->Const.FragmentProgram.MaxEnvParams))
                   || ((state_tokens[1] == STATE_LOCAL)
                       && (end_idx >=
                           ctx->Const.FragmentProgram.MaxLocalParams)))
                  out_of_range = 1;
            }
            else {
               if (((state_tokens[1] == STATE_ENV)
                    && (end_idx >= ctx->Const.VertexProgram.MaxEnvParams))
                   || ((state_tokens[1] == STATE_LOCAL)
                       && (end_idx >=
                           ctx->Const.VertexProgram.MaxLocalParams)))
                  out_of_range = 1;
            }
            if (out_of_range) {
               _mesa_set_program_error (ctx, Program->Position,
                                        "Invalid Program Parameter");
               _mesa_error (ctx, GL_INVALID_OPERATION,
                            "Invalid Program Parameter: %d", end_idx);
               return 1;
            }

            for (new_idx = start_idx; new_idx <= end_idx; new_idx++) {
               state_tokens[2] = new_idx;
               idx = _mesa_add_state_reference(Program->Base.Parameters,
                                               state_tokens);
               param_var->param_binding_length++;
               Program->Base.NumParameters++;
            }
         }
         else {
            (*inst)++;
         }
         break;

      case PARAM_CONSTANT:
         parse_constant (inst, const_values, Program, use);
         idx = _mesa_add_named_constant(Program->Base.Parameters,
                                        (char *) param_var->name,
                                        const_values);
         if (param_var->param_binding_begin == ~0U)
            param_var->param_binding_begin = idx;
         param_var->param_binding_length++;
         Program->Base.NumParameters++;
         break;

      default:
         _mesa_set_program_error(ctx, Program->Position,
                                 "Unexpected token in parse_param_elements()");
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "Unexpected token in parse_param_elements()");
         return 1;
   }

   /* Make sure we haven't blown past our parameter limits */
   if (((Program->Base.Target == GL_VERTEX_PROGRAM_ARB) &&
        (Program->Base.NumParameters >=
         ctx->Const.VertexProgram.MaxLocalParams))
       || ((Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB)
           && (Program->Base.NumParameters >=
               ctx->Const.FragmentProgram.MaxLocalParams))) {
      _mesa_set_program_error (ctx, Program->Position,
                               "Too many parameter variables");
      _mesa_error (ctx, GL_INVALID_OPERATION, "Too many parameter variables");
      return 1;
   }

   return err;
}


/**
 * This picks out PARAM program parameter bindings.
 *
 * XXX: This needs to be stressed & tested
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_param (GLcontext * ctx, GLubyte ** inst, struct var_cache **vc_head,
             struct arb_program *Program)
{
   GLuint found, err;
   GLint specified_length;
   struct var_cache *param_var;

   err = 0;
   param_var = parse_string (inst, vc_head, Program, &found);
   Program->Position = parse_position (inst);

   if (found) {
      char *error_msg = (char *)
         _mesa_malloc (_mesa_strlen ((char *) param_var->name) + 40);
      _mesa_sprintf (error_msg, "Duplicate Varible Declaration: %s",
                     param_var->name);

      _mesa_set_program_error (ctx, Program->Position, error_msg);
      _mesa_error (ctx, GL_INVALID_OPERATION, error_msg);

      _mesa_free (error_msg);
      return 1;
   }

   specified_length = parse_integer (inst, Program);

   if (specified_length < 0) {
      _mesa_set_program_error (ctx, Program->Position,
                               "Negative parameter array length");
      _mesa_error (ctx, GL_INVALID_OPERATION,
                   "Negative parameter array length: %d", specified_length);
      return 1;
   }

   param_var->type = vt_param;
   param_var->param_binding_length = 0;

   /* Right now, everything is shoved into the main state register file.
    *
    * In the future, it would be nice to leave things ENV/LOCAL params
    * in their respective register files, if possible
    */
   param_var->param_binding_type = PROGRAM_STATE_VAR;

   /* Remember to:
    * *   - add each guy to the parameter list
    * *   - increment the param_var->param_binding_len
    * *   - store the param_var->param_binding_begin for the first one
    * *   - compare the actual len to the specified len at the end
    */
   while (**inst != PARAM_NULL) {
      if (parse_param_elements (ctx, inst, param_var, Program, GL_FALSE))
         return 1;
   }

   /* Test array length here! */
   if (specified_length) {
      if (specified_length != (int)param_var->param_binding_length) {
         const char *msg
            = "Declared parameter array length does not match parameter list";
         _mesa_set_program_error(ctx, Program->Position, msg);
         _mesa_error(ctx, GL_INVALID_OPERATION, msg);
      }
   }

   (*inst)++;

   return 0;
}

/**
 *
 */
static GLuint
parse_param_use (GLcontext * ctx, GLubyte ** inst, struct var_cache **vc_head,
                 struct arb_program *Program, struct var_cache **new_var)
{
   struct var_cache *param_var;

   /* First, insert a dummy entry into the var_cache */
   var_cache_create (&param_var);
   param_var->name = (const GLubyte *) " ";
   param_var->type = vt_param;

   param_var->param_binding_length = 0;
   /* Don't fill in binding_begin; We use the default value of -1
    * to tell if its already initialized, elsewhere.
    *
    * param_var->param_binding_begin  = 0;
    */
   param_var->param_binding_type = PROGRAM_STATE_VAR;

   var_cache_append (vc_head, param_var);

   /* Then fill it with juicy parameter goodness */
   if (parse_param_elements (ctx, inst, param_var, Program, GL_TRUE))
      return 1;

   *new_var = param_var;

   return 0;
}


/**
 * This handles the declaration of TEMP variables
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_temp (GLcontext * ctx, GLubyte ** inst, struct var_cache **vc_head,
            struct arb_program *Program)
{
   GLuint found;
   struct var_cache *temp_var;

   while (**inst != 0) {
      temp_var = parse_string (inst, vc_head, Program, &found);
      Program->Position = parse_position (inst);
      if (found) {
         char *error_msg = (char *)
            _mesa_malloc (_mesa_strlen ((char *) temp_var->name) + 40);
         _mesa_sprintf (error_msg, "Duplicate Varible Declaration: %s",
                        temp_var->name);

         _mesa_set_program_error (ctx, Program->Position, error_msg);
         _mesa_error (ctx, GL_INVALID_OPERATION, error_msg);

         _mesa_free (error_msg);
         return 1;
      }

      temp_var->type = vt_temp;

      if (((Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) &&
           (Program->Base.NumTemporaries >=
            ctx->Const.FragmentProgram.MaxTemps))
          || ((Program->Base.Target == GL_VERTEX_PROGRAM_ARB)
              && (Program->Base.NumTemporaries >=
                  ctx->Const.VertexProgram.MaxTemps))) {
         _mesa_set_program_error (ctx, Program->Position,
                                  "Too many TEMP variables declared");
         _mesa_error (ctx, GL_INVALID_OPERATION,
                      "Too many TEMP variables declared");
         return 1;
      }

      temp_var->temp_binding = Program->Base.NumTemporaries;
      Program->Base.NumTemporaries++;
   }
   (*inst)++;

   return 0;
}

/**
 * This handles variables of the OUTPUT variety
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_output (GLcontext * ctx, GLubyte ** inst, struct var_cache **vc_head,
              struct arb_program *Program)
{
   GLuint found;
   struct var_cache *output_var;
   GLuint err;

   output_var = parse_string (inst, vc_head, Program, &found);
   Program->Position = parse_position (inst);
   if (found) {
      char *error_msg = (char *)
         _mesa_malloc (_mesa_strlen ((char *) output_var->name) + 40);
      _mesa_sprintf (error_msg, "Duplicate Varible Declaration: %s",
                     output_var->name);

      _mesa_set_program_error (ctx, Program->Position, error_msg);
      _mesa_error (ctx, GL_INVALID_OPERATION, error_msg);

      _mesa_free (error_msg);
      return 1;
   }

   output_var->type = vt_output;

   err = parse_result_binding(ctx, inst, &output_var->output_binding, Program);
   return err;
}

/**
 * This handles variables of the ALIAS kind
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_alias (GLcontext * ctx, GLubyte ** inst, struct var_cache **vc_head,
             struct arb_program *Program)
{
   GLuint found;
   struct var_cache *temp_var;

   temp_var = parse_string (inst, vc_head, Program, &found);
   Program->Position = parse_position (inst);

   if (found) {
      char *error_msg = (char *)
         _mesa_malloc (_mesa_strlen ((char *) temp_var->name) + 40);
      _mesa_sprintf (error_msg, "Duplicate Varible Declaration: %s",
                     temp_var->name);

      _mesa_set_program_error (ctx, Program->Position, error_msg);
      _mesa_error (ctx, GL_INVALID_OPERATION, error_msg);

      _mesa_free (error_msg);
      return 1;
   }

   temp_var->type = vt_alias;
   temp_var->alias_binding =  parse_string (inst, vc_head, Program, &found);
   Program->Position = parse_position (inst);

   if (!found)
   {
      char *error_msg = (char *)
         _mesa_malloc (_mesa_strlen ((char *) temp_var->name) + 40);
      _mesa_sprintf (error_msg, "Alias value %s is not defined",
                     temp_var->alias_binding->name);

      _mesa_set_program_error (ctx, Program->Position, error_msg);
      _mesa_error (ctx, GL_INVALID_OPERATION, error_msg);

      _mesa_free (error_msg);
      return 1;
   }

   return 0;
}

/**
 * This handles variables of the ADDRESS kind
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_address (GLcontext * ctx, GLubyte ** inst, struct var_cache **vc_head,
               struct arb_program *Program)
{
   GLuint found;
   struct var_cache *temp_var;

   while (**inst != 0) {
      temp_var = parse_string (inst, vc_head, Program, &found);
      Program->Position = parse_position (inst);
      if (found) {
         char *error_msg = (char *)
            _mesa_malloc (_mesa_strlen ((char *) temp_var->name) + 40);
         _mesa_sprintf (error_msg, "Duplicate Varible Declaration: %s",
                        temp_var->name);

         _mesa_set_program_error (ctx, Program->Position, error_msg);
         _mesa_error (ctx, GL_INVALID_OPERATION, error_msg);

         _mesa_free (error_msg);
         return 1;
      }

      temp_var->type = vt_address;

      if (Program->Base.NumAddressRegs >=
          ctx->Const.VertexProgram.MaxAddressRegs) {
         const char *msg = "Too many ADDRESS variables declared";
         _mesa_set_program_error(ctx, Program->Position, msg);
                                  
         _mesa_error(ctx, GL_INVALID_OPERATION, msg);
         return 1;
      }

      temp_var->address_binding = Program->Base.NumAddressRegs;
      Program->Base.NumAddressRegs++;
   }
   (*inst)++;

   return 0;
}

/**
 * Parse a program declaration
 *
 * \return 0 on sucess, 1 on error
 */
static GLint
parse_declaration (GLcontext * ctx, GLubyte ** inst, struct var_cache **vc_head,
                   struct arb_program *Program)
{
   GLint err = 0;

   switch (*(*inst)++) {
      case ADDRESS:
         err = parse_address (ctx, inst, vc_head, Program);
         break;

      case ALIAS:
         err = parse_alias (ctx, inst, vc_head, Program);
         break;

      case ATTRIB:
         err = parse_attrib (ctx, inst, vc_head, Program);
         break;

      case OUTPUT:
         err = parse_output (ctx, inst, vc_head, Program);
         break;

      case PARAM:
         err = parse_param (ctx, inst, vc_head, Program);
         break;

      case TEMP:
         err = parse_temp (ctx, inst, vc_head, Program);
         break;
   }

   return err;
}

/**
 * Handle the parsing out of a masked destination register, either for a
 * vertex or fragment program.
 *
 * If we are a vertex program, make sure we don't write to
 * result.position if we have specified that the program is
 * position invariant
 *
 * \param File      - The register file we write to
 * \param Index     - The register index we write to
 * \param WriteMask - The mask controlling which components we write (1->write)
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_masked_dst_reg (GLcontext * ctx, GLubyte ** inst,
                      struct var_cache **vc_head, struct arb_program *Program,
                      enum register_file *File, GLuint *Index, GLint *WriteMask)
{
   GLuint tmp, result;
   struct var_cache *dst;

   /* We either have a result register specified, or a
    * variable that may or may not be writable
    */
   switch (*(*inst)++) {
      case REGISTER_RESULT:
         if (parse_result_binding(ctx, inst, Index, Program))
            return 1;
         *File = PROGRAM_OUTPUT;
         break;

      case REGISTER_ESTABLISHED_NAME:
         dst = parse_string (inst, vc_head, Program, &result);
         Program->Position = parse_position (inst);

         /* If the name has never been added to our symbol table, we're hosed */
         if (!result) {
            _mesa_set_program_error (ctx, Program->Position,
                                     "0: Undefined variable");
            _mesa_error (ctx, GL_INVALID_OPERATION, "0: Undefined variable: %s",
                         dst->name);
            return 1;
         }

         switch (dst->type) {
            case vt_output:
               *File = PROGRAM_OUTPUT;
               *Index = dst->output_binding;
               break;

            case vt_temp:
               *File = PROGRAM_TEMPORARY;
               *Index = dst->temp_binding;
               break;

               /* If the var type is not vt_output or vt_temp, no go */
            default:
               _mesa_set_program_error (ctx, Program->Position,
                                        "Destination register is read only");
               _mesa_error (ctx, GL_INVALID_OPERATION,
                            "Destination register is read only: %s",
                            dst->name);
               return 1;
         }
         break;

      default:
         _mesa_set_program_error (ctx, Program->Position,
                                  "Unexpected opcode in parse_masked_dst_reg()");
         _mesa_error (ctx, GL_INVALID_OPERATION,
                      "Unexpected opcode in parse_masked_dst_reg()");
         return 1;
   }


   /* Position invariance test */
   /* This test is done now in syntax portion - when position invariance OPTION
      is specified, "result.position" rule is disabled so there is no way
      to write the position
   */
   /*if ((Program->HintPositionInvariant) && (*File == PROGRAM_OUTPUT) &&
      (*Index == 0))   {
      _mesa_set_program_error (ctx, Program->Position,
                  "Vertex program specified position invariance and wrote vertex position");
      _mesa_error (ctx, GL_INVALID_OPERATION,
                  "Vertex program specified position invariance and wrote vertex position");
   }*/

   /* And then the mask.
    *  w,a -> bit 0
    *  z,b -> bit 1
    *  y,g -> bit 2
    *  x,r -> bit 3
    *
    * ==> Need to reverse the order of bits for this!
    */
   tmp =  (GLint) *(*inst)++;
   *WriteMask = (((tmp>>3) & 0x1) |
		 ((tmp>>1) & 0x2) |
		 ((tmp<<1) & 0x4) |
		 ((tmp<<3) & 0x8));

   return 0;
}


/**
 * Handle the parsing of a address register
 *
 * \param Index     - The register index we write to
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_address_reg (GLcontext * ctx, GLubyte ** inst,
                          struct var_cache **vc_head,
                          struct arb_program *Program, GLint * Index)
{
   struct var_cache *dst;
   GLuint result;

   *Index = 0; /* XXX */

   dst = parse_string (inst, vc_head, Program, &result);
   Program->Position = parse_position (inst);

   /* If the name has never been added to our symbol table, we're hosed */
   if (!result) {
      _mesa_set_program_error (ctx, Program->Position, "Undefined variable");
      _mesa_error (ctx, GL_INVALID_OPERATION, "Undefined variable: %s",
                   dst->name);
      return 1;
   }

   if (dst->type != vt_address) {
      _mesa_set_program_error (ctx, Program->Position,
                               "Variable is not of type ADDRESS");
      _mesa_error (ctx, GL_INVALID_OPERATION,
                   "Variable: %s is not of type ADDRESS", dst->name);
      return 1;
   }

   return 0;
}

#if 0 /* unused */
/**
 * Handle the parsing out of a masked address register
 *
 * \param Index     - The register index we write to
 * \param WriteMask - The mask controlling which components we write (1->write)
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_masked_address_reg (GLcontext * ctx, GLubyte ** inst,
                          struct var_cache **vc_head,
                          struct arb_program *Program, GLint * Index,
                          GLboolean * WriteMask)
{
   if (parse_address_reg (ctx, inst, vc_head, Program, Index))
      return 1;

   /* This should be 0x8 */
   (*inst)++;

   /* Writemask of .x is implied */
   WriteMask[0] = 1;
   WriteMask[1] = WriteMask[2] = WriteMask[3] = 0;

   return 0;
}
#endif

/**
 * Parse out a swizzle mask.
 *
 * Basically convert COMPONENT_X/Y/Z/W to SWIZZLE_X/Y/Z/W
 *
 * The len parameter allows us to grab 4 components for a vector
 * swizzle, or just 1 component for a scalar src register selection
 */
static void
parse_swizzle_mask(GLubyte ** inst, GLubyte *swizzle, GLint len)
{
   GLint i;

   for (i = 0; i < 4; i++)
      swizzle[i] = i;

   for (i = 0; i < len; i++) {
      switch (*(*inst)++) {
         case COMPONENT_X:
            swizzle[i] = SWIZZLE_X;
            break;
         case COMPONENT_Y:
            swizzle[i] = SWIZZLE_Y;
            break;
         case COMPONENT_Z:
            swizzle[i] = SWIZZLE_Z;
            break;
         case COMPONENT_W:
            swizzle[i] = SWIZZLE_W;
            break;
         default:
            _mesa_problem(NULL, "bad component in parse_swizzle_mask()");
            return;
      }
   }
}


/**
 * Parse an extended swizzle mask which is a sequence of
 * four x/y/z/w/0/1 tokens.
 * \return swizzle  four swizzle values
 * \return negateMask  four element bitfield
 */
static void
parse_extended_swizzle_mask(GLubyte **inst, GLubyte swizzle[4],
                            GLubyte *negateMask)
{
   GLint i;

   *negateMask = 0x0;
   for (i = 0; i < 4; i++) {
      GLubyte swz;
      if (parse_sign(inst) == -1)
         *negateMask |= (1 << i);

      swz = *(*inst)++;

      switch (swz) {
         case COMPONENT_0:
            swizzle[i] = SWIZZLE_ZERO;
            break;
         case COMPONENT_1:
            swizzle[i] = SWIZZLE_ONE;
            break;
         case COMPONENT_X:
            swizzle[i] = SWIZZLE_X;
            break;
         case COMPONENT_Y:
            swizzle[i] = SWIZZLE_Y;
            break;
         case COMPONENT_Z:
            swizzle[i] = SWIZZLE_Z;
            break;
         case COMPONENT_W:
            swizzle[i] = SWIZZLE_W;
            break;
         default:
            _mesa_problem(NULL, "bad case in parse_extended_swizzle_mask()");
            return;
      }
   }
}


static GLuint
parse_src_reg (GLcontext * ctx, GLubyte ** inst, struct var_cache **vc_head,
               struct arb_program *Program,
               enum register_file * File, GLint * Index,
               GLboolean *IsRelOffset )
{
   struct var_cache *src;
   GLuint binding, is_generic, found;
   GLint offset;

   *IsRelOffset = 0;

   /* And the binding for the src */
   switch (*(*inst)++) {
      case REGISTER_ATTRIB:
         if (parse_attrib_binding
             (ctx, inst, Program, &binding, &is_generic))
            return 1;
         *File = PROGRAM_INPUT;
         *Index = binding;

         /* We need to insert a dummy variable into the var_cache so we can
          * catch generic vertex attrib aliasing errors
          */
         var_cache_create(&src);
         src->type = vt_attrib;
         src->name = (const GLubyte *) "Dummy Attrib Variable";
         src->attrib_binding = binding;
         src->attrib_is_generic = is_generic;
         var_cache_append(vc_head, src);
         if (generic_attrib_check(*vc_head)) {
            const char *msg = "Cannot use both a generic vertex attribute "
               "and a specific attribute of the same type";
            _mesa_set_program_error (ctx, Program->Position, msg);
            _mesa_error (ctx, GL_INVALID_OPERATION, msg);
            return 1;
         }
         break;

      case REGISTER_PARAM:
         switch (**inst) {
            case PARAM_ARRAY_ELEMENT:
               (*inst)++;
               src = parse_string (inst, vc_head, Program, &found);
               Program->Position = parse_position (inst);

               if (!found) {
                  _mesa_set_program_error (ctx, Program->Position,
                                           "2: Undefined variable");
                  _mesa_error (ctx, GL_INVALID_OPERATION,
                               "2: Undefined variable: %s", src->name);
                  return 1;
               }

               *File = (enum register_file) src->param_binding_type;

               switch (*(*inst)++) {
                  case ARRAY_INDEX_ABSOLUTE:
                     offset = parse_integer (inst, Program);

                     if ((offset < 0)
                         || (offset >= (int)src->param_binding_length)) {
                        _mesa_set_program_error (ctx, Program->Position,
                                                 "Index out of range");
                        _mesa_error (ctx, GL_INVALID_OPERATION,
                                     "Index %d out of range for %s", offset,
                                     src->name);
                        return 1;
                     }

                     *Index = src->param_binding_begin + offset;
                     break;

                  case ARRAY_INDEX_RELATIVE:
                     {
                        GLint addr_reg_idx, rel_off;

                        /* First, grab the address regiseter */
                        if (parse_address_reg (ctx, inst, vc_head, Program, &addr_reg_idx))
                           return 1;

                        /* And the .x */
                        ((*inst)++);
                        ((*inst)++);
                        ((*inst)++);
                        ((*inst)++);

                        /* Then the relative offset */
                        if (parse_relative_offset(ctx, inst, Program, &rel_off)) return 1;

                        /* And store it properly */
                        *Index = src->param_binding_begin + rel_off;
                        *IsRelOffset = 1;
                     }
                     break;
               }
               break;

            default:
               if (parse_param_use (ctx, inst, vc_head, Program, &src))
                  return 1;

               *File = (enum register_file) src->param_binding_type;
               *Index = src->param_binding_begin;
               break;
         }
         break;

      case REGISTER_ESTABLISHED_NAME:
         src = parse_string (inst, vc_head, Program, &found);
         Program->Position = parse_position (inst);

         /* If the name has never been added to our symbol table, we're hosed */
         if (!found) {
            _mesa_set_program_error (ctx, Program->Position,
                                     "3: Undefined variable");
            _mesa_error (ctx, GL_INVALID_OPERATION, "3: Undefined variable: %s",
                         src->name);
            return 1;
         }

         switch (src->type) {
            case vt_attrib:
               *File = PROGRAM_INPUT;
               *Index = src->attrib_binding;
               break;

               /* XXX: We have to handle offsets someplace in here!  -- or are those above? */
            case vt_param:
               *File = (enum register_file) src->param_binding_type;
               *Index = src->param_binding_begin;
               break;

            case vt_temp:
               *File = PROGRAM_TEMPORARY;
               *Index = src->temp_binding;
               break;

               /* If the var type is vt_output no go */
            default:
               _mesa_set_program_error (ctx, Program->Position,
                                        "destination register is read only");
               _mesa_error (ctx, GL_INVALID_OPERATION,
                            "destination register is read only: %s",
                            src->name);
               return 1;
         }
         break;

      default:
         _mesa_set_program_error (ctx, Program->Position,
                                  "Unknown token in parse_src_reg");
         _mesa_error (ctx, GL_INVALID_OPERATION,
                      "Unknown token in parse_src_reg");
         return 1;
   }

   return 0;
}

/**
 * Parse fragment program vector source register.
 */
static GLuint
parse_fp_vector_src_reg(GLcontext * ctx, GLubyte ** inst,
                        struct var_cache **vc_head,
                        struct arb_program *program,
                        struct prog_src_register *reg)
{
   enum register_file file;
   GLint index;
   GLboolean negate;
   GLubyte swizzle[4];
   GLboolean isRelOffset;

   /* Grab the sign */
   negate = (parse_sign (inst) == -1) ? 0xf : 0x0;

   /* And the src reg */
   if (parse_src_reg(ctx, inst, vc_head, program, &file, &index, &isRelOffset))
      return 1;

   /* finally, the swizzle */
   parse_swizzle_mask(inst, swizzle, 4);

   reg->File = file;
   reg->Index = index;
   reg->Abs = 0;		/* NV only */
   reg->NegateAbs = 0;		/* NV only */
   reg->NegateBase = negate;
   reg->Swizzle = MAKE_SWIZZLE4(swizzle[0], swizzle[1], swizzle[2], swizzle[3]);
   return 0;
}


static GLuint 
parse_fp_dst_reg(GLcontext * ctx, GLubyte ** inst,
		 struct var_cache **vc_head, struct arb_program *Program,
		 struct prog_dst_register *reg )
{
   GLint mask;
   GLuint idx;
   enum register_file file;

   if (parse_masked_dst_reg (ctx, inst, vc_head, Program, &file, &idx, &mask))
      return 1;

   reg->CondMask = 0;		/* NV only */
   reg->CondSwizzle = 0;	/* NV only */
   reg->File = file;
   reg->Index = idx;
   reg->WriteMask = mask;
   return 0;
}


/**
 * Parse fragment program scalar src register.
 */
static GLuint
parse_fp_scalar_src_reg (GLcontext * ctx, GLubyte ** inst,
			 struct var_cache **vc_head,
                         struct arb_program *Program,
			 struct prog_src_register *reg )
{
   enum register_file File;
   GLint Index;
   GLubyte Negate;
   GLubyte Swizzle[4];
   GLboolean IsRelOffset;

   /* Grab the sign */
   Negate = (parse_sign (inst) == -1) ? 0x1 : 0x0;

   /* And the src reg */
   if (parse_src_reg (ctx, inst, vc_head, Program, &File, &Index, &IsRelOffset))
      return 1;

   /* finally, the swizzle */
   parse_swizzle_mask(inst, Swizzle, 1);

   reg->File = File;
   reg->Index = Index;
   reg->Abs = 0;		/* NV only */
   reg->NegateAbs = 0;		/* NV only */
   reg->NegateBase = Negate;
   reg->Swizzle = (Swizzle[0] << 0);

   return 0;
}


/**
 * This is a big mother that handles getting opcodes into the instruction
 * and handling the src & dst registers for fragment program instructions
 */
static GLuint
parse_fp_instruction (GLcontext * ctx, GLubyte ** inst,
                      struct var_cache **vc_head, struct arb_program *Program,
                      struct prog_instruction *fp)
{
   GLint a;
   GLuint texcoord;
   GLubyte instClass, type, code;
   GLboolean rel;

   _mesa_init_instruction(fp);

   /* Record the position in the program string for debugging */
   fp->StringPos = Program->Position;

   /* OP_ALU_INST or OP_TEX_INST */
   instClass = *(*inst)++;

   /* OP_ALU_{VECTOR, SCALAR, BINSC, BIN, TRI, SWZ},
    * OP_TEX_{SAMPLE, KIL}
    */
   type = *(*inst)++;

   /* The actual opcode name */
   code = *(*inst)++;

   /* Increment the correct count */
   switch (instClass) {
      case OP_ALU_INST:
         Program->NumAluInstructions++;
         break;
      case OP_TEX_INST:
         Program->NumTexInstructions++;
         break;
   }

   switch (type) {
      case OP_ALU_VECTOR:
         switch (code) {
            case OP_ABS_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_ABS:
               fp->Opcode = OPCODE_ABS;
               break;

            case OP_FLR_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_FLR:
               fp->Opcode = OPCODE_FLR;
               break;

            case OP_FRC_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_FRC:
               fp->Opcode = OPCODE_FRC;
               break;

            case OP_LIT_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_LIT:
               fp->Opcode = OPCODE_LIT;
               break;

            case OP_MOV_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_MOV:
               fp->Opcode = OPCODE_MOV;
               break;
         }

         if (parse_fp_dst_reg (ctx, inst, vc_head, Program, &fp->DstReg))
            return 1;

         if (parse_fp_vector_src_reg(ctx, inst, vc_head, Program, &fp->SrcReg[0]))
            return 1;
         break;

      case OP_ALU_SCALAR:
         switch (code) {
            case OP_COS_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_COS:
               fp->Opcode = OPCODE_COS;
               break;

            case OP_EX2_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_EX2:
               fp->Opcode = OPCODE_EX2;
               break;

            case OP_LG2_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_LG2:
               fp->Opcode = OPCODE_LG2;
               break;

            case OP_RCP_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_RCP:
               fp->Opcode = OPCODE_RCP;
               break;

            case OP_RSQ_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_RSQ:
               fp->Opcode = OPCODE_RSQ;
               break;

            case OP_SIN_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_SIN:
               fp->Opcode = OPCODE_SIN;
               break;

            case OP_SCS_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_SCS:

               fp->Opcode = OPCODE_SCS;
               break;
         }

         if (parse_fp_dst_reg (ctx, inst, vc_head, Program, &fp->DstReg))
            return 1;

         if (parse_fp_scalar_src_reg(ctx, inst, vc_head, Program, &fp->SrcReg[0]))
            return 1;
         break;

      case OP_ALU_BINSC:
         switch (code) {
            case OP_POW_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_POW:
               fp->Opcode = OPCODE_POW;
               break;
         }

         if (parse_fp_dst_reg(ctx, inst, vc_head, Program, &fp->DstReg))
            return 1;

         for (a = 0; a < 2; a++) {
	    if (parse_fp_scalar_src_reg(ctx, inst, vc_head, Program, &fp->SrcReg[a]))
               return 1;
         }
         break;


      case OP_ALU_BIN:
         switch (code) {
            case OP_ADD_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_ADD:
               fp->Opcode = OPCODE_ADD;
               break;

            case OP_DP3_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_DP3:
               fp->Opcode = OPCODE_DP3;
               break;

            case OP_DP4_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_DP4:
               fp->Opcode = OPCODE_DP4;
               break;

            case OP_DPH_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_DPH:
               fp->Opcode = OPCODE_DPH;
               break;

            case OP_DST_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_DST:
               fp->Opcode = OPCODE_DST;
               break;

            case OP_MAX_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_MAX:
               fp->Opcode = OPCODE_MAX;
               break;

            case OP_MIN_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_MIN:
               fp->Opcode = OPCODE_MIN;
               break;

            case OP_MUL_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_MUL:
               fp->Opcode = OPCODE_MUL;
               break;

            case OP_SGE_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_SGE:
               fp->Opcode = OPCODE_SGE;
               break;

            case OP_SLT_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_SLT:
               fp->Opcode = OPCODE_SLT;
               break;

            case OP_SUB_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_SUB:
               fp->Opcode = OPCODE_SUB;
               break;

            case OP_XPD_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_XPD:
               fp->Opcode = OPCODE_XPD;
               break;
         }

         if (parse_fp_dst_reg (ctx, inst, vc_head, Program, &fp->DstReg))
            return 1;
         for (a = 0; a < 2; a++) {
	    if (parse_fp_vector_src_reg(ctx, inst, vc_head, Program, &fp->SrcReg[a]))
	       return 1;
         }
         break;

      case OP_ALU_TRI:
         switch (code) {
            case OP_CMP_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_CMP:
               fp->Opcode = OPCODE_CMP;
               break;

            case OP_LRP_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_LRP:
               fp->Opcode = OPCODE_LRP;
               break;

            case OP_MAD_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_MAD:
               fp->Opcode = OPCODE_MAD;
               break;
         }

         if (parse_fp_dst_reg (ctx, inst, vc_head, Program, &fp->DstReg))
            return 1;

         for (a = 0; a < 3; a++) {
	    if (parse_fp_vector_src_reg(ctx, inst, vc_head, Program, &fp->SrcReg[a]))
	       return 1;
         }
         break;

      case OP_ALU_SWZ:
         switch (code) {
            case OP_SWZ_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_SWZ:
               fp->Opcode = OPCODE_SWZ;
               break;
         }
         if (parse_fp_dst_reg (ctx, inst, vc_head, Program, &fp->DstReg))
            return 1;

	 {
	    GLubyte swizzle[4];
	    GLubyte negateMask;
            enum register_file file;
	    GLint index;

	    if (parse_src_reg(ctx, inst, vc_head, Program, &file, &index, &rel))
	       return 1;
	    parse_extended_swizzle_mask(inst, swizzle, &negateMask);
	    fp->SrcReg[0].File = file;
	    fp->SrcReg[0].Index = index;
	    fp->SrcReg[0].NegateBase = negateMask;
	    fp->SrcReg[0].Swizzle = MAKE_SWIZZLE4(swizzle[0],
                                                  swizzle[1],
                                                  swizzle[2],
                                                  swizzle[3]);
	 }
         break;

      case OP_TEX_SAMPLE:
         switch (code) {
            case OP_TEX_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_TEX:
               fp->Opcode = OPCODE_TEX;
               break;

            case OP_TXP_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_TXP:
               fp->Opcode = OPCODE_TXP;
               break;

            case OP_TXB_SAT:
               fp->SaturateMode = SATURATE_ZERO_ONE;
            case OP_TXB:
               fp->Opcode = OPCODE_TXB;
               break;
         }

         if (parse_fp_dst_reg (ctx, inst, vc_head, Program, &fp->DstReg))
            return 1;

	 if (parse_fp_vector_src_reg(ctx, inst, vc_head, Program, &fp->SrcReg[0]))
            return 1;

         /* texImageUnit */
         if (parse_texcoord_num (ctx, inst, Program, &texcoord))
            return 1;
         fp->TexSrcUnit = texcoord;

         /* texTarget */
         switch (*(*inst)++) {
            case TEXTARGET_1D:
               fp->TexSrcTarget = TEXTURE_1D_INDEX;
               break;
            case TEXTARGET_2D:
               fp->TexSrcTarget = TEXTURE_2D_INDEX;
               break;
            case TEXTARGET_3D:
               fp->TexSrcTarget = TEXTURE_3D_INDEX;
               break;
            case TEXTARGET_RECT:
               fp->TexSrcTarget = TEXTURE_RECT_INDEX;
               break;
            case TEXTARGET_CUBE:
               fp->TexSrcTarget = TEXTURE_CUBE_INDEX;
               break;
	    case TEXTARGET_SHADOW1D:
	    case TEXTARGET_SHADOW2D:
	    case TEXTARGET_SHADOWRECT:
	       /* TODO ARB_fragment_program_shadow code */
	       break;
         }
         Program->TexturesUsed[texcoord] |= (1<<fp->TexSrcTarget);
         break;

      case OP_TEX_KIL:
         Program->UsesKill = 1;
	 if (parse_fp_vector_src_reg(ctx, inst, vc_head, Program, &fp->SrcReg[0]))
            return 1;
         fp->Opcode = OPCODE_KIL;
         break;
   }

   return 0;
}

static GLuint 
parse_vp_dst_reg(GLcontext * ctx, GLubyte ** inst,
		 struct var_cache **vc_head, struct arb_program *Program,
		 struct prog_dst_register *reg )
{
   GLint mask;
   GLuint idx;
   enum register_file file;

   if (parse_masked_dst_reg(ctx, inst, vc_head, Program, &file, &idx, &mask))
      return 1;

   reg->File = file;
   reg->Index = idx;
   reg->WriteMask = mask;
   return 0;
}

/**
 * Handle the parsing out of a masked address register
 *
 * \param Index     - The register index we write to
 * \param WriteMask - The mask controlling which components we write (1->write)
 *
 * \return 0 on sucess, 1 on error
 */
static GLuint
parse_vp_address_reg (GLcontext * ctx, GLubyte ** inst,
		      struct var_cache **vc_head,
		      struct arb_program *Program,
		      struct prog_dst_register *reg)
{
   GLint idx;

   if (parse_address_reg (ctx, inst, vc_head, Program, &idx))
      return 1;

   /* This should be 0x8 */
   (*inst)++;

   reg->File = PROGRAM_ADDRESS;
   reg->Index = idx;

   /* Writemask of .x is implied */
   reg->WriteMask = 0x1;
   return 0;
}

/**
 * Parse vertex program vector source register.
 */
static GLuint
parse_vp_vector_src_reg(GLcontext * ctx, GLubyte ** inst,
                        struct var_cache **vc_head,
                        struct arb_program *program,
                        struct prog_src_register *reg )
{
   enum register_file file;
   GLint index;
   GLubyte negateMask;
   GLubyte swizzle[4];
   GLboolean isRelOffset;

   /* Grab the sign */
   negateMask = (parse_sign (inst) == -1) ? 0xf : 0x0;

   /* And the src reg */
   if (parse_src_reg (ctx, inst, vc_head, program, &file, &index, &isRelOffset))
      return 1;

   /* finally, the swizzle */
   parse_swizzle_mask(inst, swizzle, 4);

   reg->File = file;
   reg->Index = index;
   reg->Swizzle = MAKE_SWIZZLE4(swizzle[0], swizzle[1],
                                swizzle[2], swizzle[3]);
   reg->NegateBase = negateMask;
   reg->RelAddr = isRelOffset;
   return 0;
}


static GLuint
parse_vp_scalar_src_reg (GLcontext * ctx, GLubyte ** inst,
			 struct var_cache **vc_head,
                         struct arb_program *Program,
			 struct prog_src_register *reg )
{
   enum register_file File;
   GLint Index;
   GLubyte Negate;
   GLubyte Swizzle[4];
   GLboolean IsRelOffset;

   /* Grab the sign */
   Negate = (parse_sign (inst) == -1) ? 0x1 : 0x0;

   /* And the src reg */
   if (parse_src_reg (ctx, inst, vc_head, Program, &File, &Index, &IsRelOffset))
      return 1;

   /* finally, the swizzle */
   parse_swizzle_mask(inst, Swizzle, 1);

   reg->File = File;
   reg->Index = Index;
   reg->Swizzle = (Swizzle[0] << 0);
   reg->NegateBase = Negate;
   reg->RelAddr = IsRelOffset;
   return 0;
}


/**
 * This is a big mother that handles getting opcodes into the instruction
 * and handling the src & dst registers for vertex program instructions
 */
static GLuint
parse_vp_instruction (GLcontext * ctx, GLubyte ** inst,
                      struct var_cache **vc_head, struct arb_program *Program,
                      struct prog_instruction *vp)
{
   GLint a;
   GLubyte type, code;

   /* OP_ALU_{ARL, VECTOR, SCALAR, BINSC, BIN, TRI, SWZ} */
   type = *(*inst)++;

   /* The actual opcode name */
   code = *(*inst)++;

   _mesa_init_instruction(vp);
   /* Record the position in the program string for debugging */
   vp->StringPos = Program->Position;

   switch (type) {
         /* XXX: */
      case OP_ALU_ARL:
         vp->Opcode = OPCODE_ARL;

         /* Remember to set SrcReg.RelAddr; */

         /* Get the masked address register [dst] */
         if (parse_vp_address_reg(ctx, inst, vc_head, Program, &vp->DstReg))
            return 1;

         vp->DstReg.File = PROGRAM_ADDRESS;

         /* Get a scalar src register */
	 if (parse_vp_scalar_src_reg(ctx, inst, vc_head, Program, &vp->SrcReg[0]))
            return 1;

         break;

      case OP_ALU_VECTOR:
         switch (code) {
            case OP_ABS:
               vp->Opcode = OPCODE_ABS;
               break;
            case OP_FLR:
               vp->Opcode = OPCODE_FLR;
               break;
            case OP_FRC:
               vp->Opcode = OPCODE_FRC;
               break;
            case OP_LIT:
               vp->Opcode = OPCODE_LIT;
               break;
            case OP_MOV:
               vp->Opcode = OPCODE_MOV;
               break;
         }

         if (parse_vp_dst_reg(ctx, inst, vc_head, Program, &vp->DstReg))
            return 1;

         if (parse_vp_vector_src_reg(ctx, inst, vc_head, Program, &vp->SrcReg[0]))
            return 1;
         break;

      case OP_ALU_SCALAR:
         switch (code) {
            case OP_EX2:
               vp->Opcode = OPCODE_EX2;
               break;
            case OP_EXP:
               vp->Opcode = OPCODE_EXP;
               break;
            case OP_LG2:
               vp->Opcode = OPCODE_LG2;
               break;
            case OP_LOG:
               vp->Opcode = OPCODE_LOG;
               break;
            case OP_RCP:
               vp->Opcode = OPCODE_RCP;
               break;
            case OP_RSQ:
               vp->Opcode = OPCODE_RSQ;
               break;
         }
         if (parse_vp_dst_reg(ctx, inst, vc_head, Program, &vp->DstReg))
            return 1;

	 if (parse_vp_scalar_src_reg(ctx, inst, vc_head, Program, &vp->SrcReg[0]))
            return 1;
         break;

      case OP_ALU_BINSC:
         switch (code) {
            case OP_POW:
               vp->Opcode = OPCODE_POW;
               break;
         }
         if (parse_vp_dst_reg(ctx, inst, vc_head, Program, &vp->DstReg))
            return 1;

         for (a = 0; a < 2; a++) {
	    if (parse_vp_scalar_src_reg(ctx, inst, vc_head, Program, &vp->SrcReg[a]))
               return 1;
         }
         break;

      case OP_ALU_BIN:
         switch (code) {
            case OP_ADD:
               vp->Opcode = OPCODE_ADD;
               break;
            case OP_DP3:
               vp->Opcode = OPCODE_DP3;
               break;
            case OP_DP4:
               vp->Opcode = OPCODE_DP4;
               break;
            case OP_DPH:
               vp->Opcode = OPCODE_DPH;
               break;
            case OP_DST:
               vp->Opcode = OPCODE_DST;
               break;
            case OP_MAX:
               vp->Opcode = OPCODE_MAX;
               break;
            case OP_MIN:
               vp->Opcode = OPCODE_MIN;
               break;
            case OP_MUL:
               vp->Opcode = OPCODE_MUL;
               break;
            case OP_SGE:
               vp->Opcode = OPCODE_SGE;
               break;
            case OP_SLT:
               vp->Opcode = OPCODE_SLT;
               break;
            case OP_SUB:
               vp->Opcode = OPCODE_SUB;
               break;
            case OP_XPD:
               vp->Opcode = OPCODE_XPD;
               break;
         }
         if (parse_vp_dst_reg(ctx, inst, vc_head, Program, &vp->DstReg))
            return 1;

         for (a = 0; a < 2; a++) {
	    if (parse_vp_vector_src_reg(ctx, inst, vc_head, Program, &vp->SrcReg[a]))
               return 1;
         }
         break;

      case OP_ALU_TRI:
         switch (code) {
            case OP_MAD:
               vp->Opcode = OPCODE_MAD;
               break;
         }

         if (parse_vp_dst_reg(ctx, inst, vc_head, Program, &vp->DstReg))
            return 1;

         for (a = 0; a < 3; a++) {
	    if (parse_vp_vector_src_reg(ctx, inst, vc_head, Program, &vp->SrcReg[a]))
               return 1;
         }
         break;

      case OP_ALU_SWZ:
         switch (code) {
            case OP_SWZ:
               vp->Opcode = OPCODE_SWZ;
               break;
         }
	 {
	    GLubyte swizzle[4]; 
	    GLubyte negateMask;
	    GLboolean relAddr;
            enum register_file file;
	    GLint index;

	    if (parse_vp_dst_reg(ctx, inst, vc_head, Program, &vp->DstReg))
	       return 1;

	    if (parse_src_reg(ctx, inst, vc_head, Program, &file, &index, &relAddr))
	       return 1;
	    parse_extended_swizzle_mask (inst, swizzle, &negateMask);
	    vp->SrcReg[0].File = file;
	    vp->SrcReg[0].Index = index;
	    vp->SrcReg[0].NegateBase = negateMask;
	    vp->SrcReg[0].Swizzle = MAKE_SWIZZLE4(swizzle[0],
                                                  swizzle[1],
                                                  swizzle[2],
                                                  swizzle[3]);
	    vp->SrcReg[0].RelAddr = relAddr;
	 }
         break;
   }
   return 0;
}

#if DEBUG_PARSING

static GLvoid
print_state_token (GLint token)
{
   switch (token) {
      case STATE_MATERIAL:
         fprintf (stderr, "STATE_MATERIAL ");
         break;
      case STATE_LIGHT:
         fprintf (stderr, "STATE_LIGHT ");
         break;

      case STATE_LIGHTMODEL_AMBIENT:
         fprintf (stderr, "STATE_AMBIENT ");
         break;

      case STATE_LIGHTMODEL_SCENECOLOR:
         fprintf (stderr, "STATE_SCENECOLOR ");
         break;

      case STATE_LIGHTPROD:
         fprintf (stderr, "STATE_LIGHTPROD ");
         break;

      case STATE_TEXGEN:
         fprintf (stderr, "STATE_TEXGEN ");
         break;

      case STATE_FOG_COLOR:
         fprintf (stderr, "STATE_FOG_COLOR ");
         break;

      case STATE_FOG_PARAMS:
         fprintf (stderr, "STATE_FOG_PARAMS ");
         break;

      case STATE_CLIPPLANE:
         fprintf (stderr, "STATE_CLIPPLANE ");
         break;

      case STATE_POINT_SIZE:
         fprintf (stderr, "STATE_POINT_SIZE ");
         break;

      case STATE_POINT_ATTENUATION:
         fprintf (stderr, "STATE_ATTENUATION ");
         break;

      case STATE_MATRIX:
         fprintf (stderr, "STATE_MATRIX ");
         break;

      case STATE_MODELVIEW:
         fprintf (stderr, "STATE_MODELVIEW ");
         break;

      case STATE_PROJECTION:
         fprintf (stderr, "STATE_PROJECTION ");
         break;

      case STATE_MVP:
         fprintf (stderr, "STATE_MVP ");
         break;

      case STATE_TEXTURE:
         fprintf (stderr, "STATE_TEXTURE ");
         break;

      case STATE_PROGRAM:
         fprintf (stderr, "STATE_PROGRAM ");
         break;

      case STATE_MATRIX_INVERSE:
         fprintf (stderr, "STATE_INVERSE ");
         break;

      case STATE_MATRIX_TRANSPOSE:
         fprintf (stderr, "STATE_TRANSPOSE ");
         break;

      case STATE_MATRIX_INVTRANS:
         fprintf (stderr, "STATE_INVTRANS ");
         break;

      case STATE_AMBIENT:
         fprintf (stderr, "STATE_AMBIENT ");
         break;

      case STATE_DIFFUSE:
         fprintf (stderr, "STATE_DIFFUSE ");
         break;

      case STATE_SPECULAR:
         fprintf (stderr, "STATE_SPECULAR ");
         break;

      case STATE_EMISSION:
         fprintf (stderr, "STATE_EMISSION ");
         break;

      case STATE_SHININESS:
         fprintf (stderr, "STATE_SHININESS ");
         break;

      case STATE_HALF:
         fprintf (stderr, "STATE_HALF ");
         break;

      case STATE_POSITION:
         fprintf (stderr, "STATE_POSITION ");
         break;

      case STATE_ATTENUATION:
         fprintf (stderr, "STATE_ATTENUATION ");
         break;

      case STATE_SPOT_DIRECTION:
         fprintf (stderr, "STATE_DIRECTION ");
         break;

      case STATE_TEXGEN_EYE_S:
         fprintf (stderr, "STATE_TEXGEN_EYE_S ");
         break;

      case STATE_TEXGEN_EYE_T:
         fprintf (stderr, "STATE_TEXGEN_EYE_T ");
         break;

      case STATE_TEXGEN_EYE_R:
         fprintf (stderr, "STATE_TEXGEN_EYE_R ");
         break;

      case STATE_TEXGEN_EYE_Q:
         fprintf (stderr, "STATE_TEXGEN_EYE_Q ");
         break;

      case STATE_TEXGEN_OBJECT_S:
         fprintf (stderr, "STATE_TEXGEN_EYE_S ");
         break;

      case STATE_TEXGEN_OBJECT_T:
         fprintf (stderr, "STATE_TEXGEN_OBJECT_T ");
         break;

      case STATE_TEXGEN_OBJECT_R:
         fprintf (stderr, "STATE_TEXGEN_OBJECT_R ");
         break;

      case STATE_TEXGEN_OBJECT_Q:
         fprintf (stderr, "STATE_TEXGEN_OBJECT_Q ");
         break;

      case STATE_TEXENV_COLOR:
         fprintf (stderr, "STATE_TEXENV_COLOR ");
         break;

      case STATE_DEPTH_RANGE:
         fprintf (stderr, "STATE_DEPTH_RANGE ");
         break;

      case STATE_VERTEX_PROGRAM:
         fprintf (stderr, "STATE_VERTEX_PROGRAM ");
         break;

      case STATE_FRAGMENT_PROGRAM:
         fprintf (stderr, "STATE_FRAGMENT_PROGRAM ");
         break;

      case STATE_ENV:
         fprintf (stderr, "STATE_ENV ");
         break;

      case STATE_LOCAL:
         fprintf (stderr, "STATE_LOCAL ");
         break;

   }
   fprintf (stderr, "[%d] ", token);
}


static GLvoid
debug_variables (GLcontext * ctx, struct var_cache *vc_head,
                 struct arb_program *Program)
{
   struct var_cache *vc;
   GLint a, b;

   fprintf (stderr, "debug_variables, vc_head: %x\n", vc_head);

   /* First of all, print out the contents of the var_cache */
   vc = vc_head;
   while (vc) {
      fprintf (stderr, "[%x]\n", vc);
      switch (vc->type) {
         case vt_none:
            fprintf (stderr, "UNDEFINED %s\n", vc->name);
            break;
         case vt_attrib:
            fprintf (stderr, "ATTRIB    %s\n", vc->name);
            fprintf (stderr, "          binding: 0x%x\n", vc->attrib_binding);
            break;
         case vt_param:
            fprintf (stderr, "PARAM     %s  begin: %d len: %d\n", vc->name,
                     vc->param_binding_begin, vc->param_binding_length);
            b = vc->param_binding_begin;
            for (a = 0; a < vc->param_binding_length; a++) {
               fprintf (stderr, "%s\n",
                        Program->Parameters->Parameters[a + b].Name);
               if (Program->Parameters->Parameters[a + b].Type == STATE) {
                  print_state_token (Program->Parameters->Parameters[a + b].
                                     StateIndexes[0]);
                  print_state_token (Program->Parameters->Parameters[a + b].
                                     StateIndexes[1]);
                  print_state_token (Program->Parameters->Parameters[a + b].
                                     StateIndexes[2]);
                  print_state_token (Program->Parameters->Parameters[a + b].
                                     StateIndexes[3]);
                  print_state_token (Program->Parameters->Parameters[a + b].
                                     StateIndexes[4]);
                  print_state_token (Program->Parameters->Parameters[a + b].
                                     StateIndexes[5]);
               }
               else
                  fprintf (stderr, "%f %f %f %f\n",
                           Program->Parameters->Parameters[a + b].Values[0],
                           Program->Parameters->Parameters[a + b].Values[1],
                           Program->Parameters->Parameters[a + b].Values[2],
                           Program->Parameters->Parameters[a + b].Values[3]);
            }
            break;
         case vt_temp:
            fprintf (stderr, "TEMP      %s\n", vc->name);
            fprintf (stderr, "          binding: 0x%x\n", vc->temp_binding);
            break;
         case vt_output:
            fprintf (stderr, "OUTPUT    %s\n", vc->name);
            fprintf (stderr, "          binding: 0x%x\n", vc->output_binding);
            break;
         case vt_alias:
            fprintf (stderr, "ALIAS     %s\n", vc->name);
            fprintf (stderr, "          binding: 0x%x (%s)\n",
                     vc->alias_binding, vc->alias_binding->name);
            break;
      }
      vc = vc->next;
   }
}

#endif /* DEBUG_PARSING */


/**
 * The main loop for parsing a fragment or vertex program
 *
 * \return 1 on error, 0 on success
 */
static GLint
parse_instructions(GLcontext * ctx, GLubyte * inst, struct var_cache **vc_head,
                  struct arb_program *Program)
{
   const GLuint maxInst = (Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB)
      ? ctx->Const.FragmentProgram.MaxInstructions
      : ctx->Const.VertexProgram.MaxInstructions;
   GLint err = 0;

   ASSERT(MAX_INSTRUCTIONS >= maxInst);

   Program->MajorVersion = (GLuint) * inst++;
   Program->MinorVersion = (GLuint) * inst++;

   while (*inst != END) {
      switch (*inst++) {

         case OPTION:
            switch (*inst++) {
               case ARB_PRECISION_HINT_FASTEST:
                  Program->PrecisionOption = GL_FASTEST;
                  break;

               case ARB_PRECISION_HINT_NICEST:
                  Program->PrecisionOption = GL_NICEST;
                  break;

               case ARB_FOG_EXP:
                  Program->FogOption = GL_EXP;
                  break;

               case ARB_FOG_EXP2:
                  Program->FogOption = GL_EXP2;
                  break;

               case ARB_FOG_LINEAR:
                  Program->FogOption = GL_LINEAR;
                  break;

               case ARB_POSITION_INVARIANT:
                  if (Program->Base.Target == GL_VERTEX_PROGRAM_ARB)
                     Program->HintPositionInvariant = GL_TRUE;
                  break;

               case ARB_FRAGMENT_PROGRAM_SHADOW:
	          if (Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
	             /* TODO ARB_fragment_program_shadow code */
		  }
		  break;

               case ARB_DRAW_BUFFERS:
	          if (Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
                     /* do nothing for now */
                  }
                  break;
            }
            break;

         case INSTRUCTION:
            /* check length */
            if (Program->Base.NumInstructions + 1 >= maxInst) {
               const char *msg = "Max instruction count exceeded";
               _mesa_set_program_error(ctx, Program->Position, msg);
               _mesa_error(ctx, GL_INVALID_OPERATION, msg);
               return 1;
            }
            Program->Position = parse_position (&inst);
            /* parse the current instruction */
            if (Program->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
               err = parse_fp_instruction (ctx, &inst, vc_head, Program,
                      &Program->Base.Instructions[Program->Base.NumInstructions]);
            }
            else {
               err = parse_vp_instruction (ctx, &inst, vc_head, Program,
                      &Program->Base.Instructions[Program->Base.NumInstructions]);
            }

            /* increment instuction count */
            Program->Base.NumInstructions++;
            break;

         case DECLARATION:
            err = parse_declaration (ctx, &inst, vc_head, Program);
            break;

         default:
            break;
      }

      if (err)
         break;
   }

   /* Finally, tag on an OPCODE_END instruction */
   {
      const GLuint numInst = Program->Base.NumInstructions;
      _mesa_init_instruction(Program->Base.Instructions + numInst);
      Program->Base.Instructions[numInst].Opcode = OPCODE_END;
      /* YYY Wrong Position in program, whatever, at least not random -> crash
	 Program->Position = parse_position (&inst);
      */
      Program->Base.Instructions[numInst].StringPos = Program->Position;
   }
   Program->Base.NumInstructions++;

   /*
    * Initialize native counts to logical counts.  The device driver may
    * change them if program is translated into a hardware program.
    */
   Program->Base.NumNativeInstructions = Program->Base.NumInstructions;
   Program->Base.NumNativeTemporaries = Program->Base.NumTemporaries;
   Program->Base.NumNativeParameters = Program->Base.NumParameters;
   Program->Base.NumNativeAttributes = Program->Base.NumAttributes;
   Program->Base.NumNativeAddressRegs = Program->Base.NumAddressRegs;

   return err;
}


/* XXX temporary */
__extension__ static char core_grammar_text[] =
#include "grammar_syn.h"
;


/**
 * Set a grammar parameter.
 * \param name the grammar parameter
 * \param value the new parameter value
 * \return 0 if OK, 1 if error
 */
static int
set_reg8 (GLcontext *ctx, grammar id, const char *name, GLubyte value)
{
   char error_msg[300];
   GLint error_pos;

   if (grammar_set_reg8 (id, (const byte *) name, value))
      return 0;

   grammar_get_last_error ((byte *) error_msg, 300, &error_pos);
   _mesa_set_program_error (ctx, error_pos, error_msg);
   _mesa_error (ctx, GL_INVALID_OPERATION, "Grammar Register Error");
   return 1;
}


/**
 * Enable support for the given language option in the parser.
 * \return 1 if OK, 0 if error
 */
static int
enable_ext(GLcontext *ctx, grammar id, const char *name)
{
   return !set_reg8(ctx, id, name, 1);
}


/**
 * Enable parser extensions based on which OpenGL extensions are supported
 * by this rendering context.
 *
 * \return GL_TRUE if OK, GL_FALSE if error.
 */
static GLboolean
enable_parser_extensions(GLcontext *ctx, grammar id)
{
#if 0
   /* These are not supported at this time */
   if ((ctx->Extensions.ARB_vertex_blend ||
        ctx->Extensions.EXT_vertex_weighting)
       && !enable_ext(ctx, id, "point_parameters"))
      return GL_FALSE;
   if (ctx->Extensions.ARB_matrix_palette
       && !enable_ext(ctx, id, "matrix_palette"))
      return GL_FALSE;
   if (ctx->Extensions.ARB_fragment_program_shadow
       && !enable_ext(ctx, id, "fragment_program_shadow"))
      return GL_FALSE;
#endif
   if (ctx->Extensions.EXT_point_parameters
       && !enable_ext(ctx, id, "point_parameters"))
      return GL_FALSE;
   if (ctx->Extensions.EXT_secondary_color
       && !enable_ext(ctx, id, "secondary_color"))
      return GL_FALSE;
   if (ctx->Extensions.EXT_fog_coord
       && !enable_ext(ctx, id, "fog_coord"))
      return GL_FALSE;
   if (ctx->Extensions.NV_texture_rectangle
       && !enable_ext(ctx, id, "texture_rectangle"))
      return GL_FALSE;
   if (ctx->Extensions.ARB_draw_buffers
       && !enable_ext(ctx, id, "draw_buffers"))
      return GL_FALSE;

   return GL_TRUE;
}


/**
 * This kicks everything off.
 *
 * \param ctx - The GL Context
 * \param str - The program string
 * \param len - The program string length
 * \param program - The arb_program struct to return all the parsed info in
 * \return GL_TRUE on sucess, GL_FALSE on error
 */
static GLboolean
_mesa_parse_arb_program(GLcontext *ctx, GLenum target,
                        const GLubyte *str, GLsizei len,
                        struct arb_program *program)
{
   GLint a, err, error_pos;
   char error_msg[300];
   GLuint parsed_len;
   struct var_cache *vc_head;
   grammar arbprogram_syn_id;
   GLubyte *parsed, *inst;
   GLubyte *strz = NULL;
   static int arbprogram_syn_is_ok = 0;		/* XXX temporary */

   /* set the program target before parsing */
   program->Base.Target = target;

   /* Reset error state */
   _mesa_set_program_error(ctx, -1, NULL);

   /* check if arb_grammar_text (arbprogram.syn) is syntactically correct */
   if (!arbprogram_syn_is_ok) {
      /* One-time initialization of parsing system */
      grammar grammar_syn_id;
      GLuint parsed_len;

      grammar_syn_id = grammar_load_from_text ((byte *) core_grammar_text);
      if (grammar_syn_id == 0) {
         grammar_get_last_error ((byte *) error_msg, 300, &error_pos);
         /* XXX this is not a GL error - it's an implementation bug! - FIX */
         _mesa_set_program_error (ctx, error_pos, error_msg);
         _mesa_error (ctx, GL_INVALID_OPERATION,
                      "glProgramStringARB(Error loading grammar rule set)");
         return GL_FALSE;
      }

      err = !grammar_check(grammar_syn_id, (byte *) arb_grammar_text,
                           &parsed, &parsed_len);

      /* 'parsed' is unused here */
      _mesa_free (parsed);
      parsed = NULL;

      /* NOTE: we can't destroy grammar_syn_id right here because
       * grammar_destroy() can reset the last error
       */
      if (err) {
         /* XXX this is not a GL error - it's an implementation bug! - FIX */
         grammar_get_last_error ((byte *) error_msg, 300, &error_pos);
         _mesa_set_program_error (ctx, error_pos, error_msg);
         _mesa_error (ctx, GL_INVALID_OPERATION,
                      "glProgramString(Error loading grammar rule set");
         grammar_destroy (grammar_syn_id);
         return GL_FALSE;
      }

      grammar_destroy (grammar_syn_id);

      arbprogram_syn_is_ok = 1;
   }

   /* create the grammar object */
   arbprogram_syn_id = grammar_load_from_text ((byte *) arb_grammar_text);
   if (arbprogram_syn_id == 0) {
      /* XXX this is not a GL error - it's an implementation bug! - FIX */
      grammar_get_last_error ((GLubyte *) error_msg, 300, &error_pos);
      _mesa_set_program_error (ctx, error_pos, error_msg);
      _mesa_error (ctx, GL_INVALID_OPERATION,
                   "glProgramString(Error loading grammer rule set)");
      return GL_FALSE;
   }

   /* Set program_target register value */
   if (set_reg8 (ctx, arbprogram_syn_id, "program_target",
      program->Base.Target == GL_FRAGMENT_PROGRAM_ARB ? 0x10 : 0x20)) {
      grammar_destroy (arbprogram_syn_id);
      return GL_FALSE;
   }

   if (!enable_parser_extensions(ctx, arbprogram_syn_id)) {
      grammar_destroy(arbprogram_syn_id);
      return GL_FALSE;
   }

   /* check for NULL character occurences */
   {
      GLint i;
      for (i = 0; i < len; i++) {
         if (str[i] == '\0') {
            _mesa_set_program_error (ctx, i, "invalid character");
            _mesa_error (ctx, GL_INVALID_OPERATION,
                         "glProgramStringARB(illegal character)");
            grammar_destroy (arbprogram_syn_id);
            return GL_FALSE;
         }
      }
   }

   /* copy the program string to a null-terminated string */
   strz = (GLubyte *) _mesa_malloc (len + 1);
   if (!strz) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glProgramStringARB");
      grammar_destroy (arbprogram_syn_id);
      return GL_FALSE;
   }
   _mesa_memcpy (strz, str, len);
   strz[len] = '\0';

   /* do a fast check on program string - initial production buffer is 4K */
   err = !grammar_fast_check(arbprogram_syn_id, strz,
                             &parsed, &parsed_len, 0x1000);

   /* Syntax parse error */
   if (err) {
      _mesa_free(strz);
      _mesa_free(parsed);
      grammar_get_last_error ((GLubyte *) error_msg, 300, &error_pos);
      _mesa_set_program_error (ctx, error_pos, error_msg);
      _mesa_error (ctx, GL_INVALID_OPERATION,
                   "glProgramStringARB(syntax error)");

      /* useful for debugging */
#if DEBUG_PARSING
      do {
         int line, col;
         char *s;
         fprintf(stderr, "program: %s\n", (char *) strz);
         fprintf(stderr, "Error Pos: %d\n", ctx->program.ErrorPos);
         s = (char *) _mesa_find_line_column(strz, strz+ctx->program.ErrorPos, &line, &col);
         fprintf(stderr, "line %d col %d: %s\n", line, col, s);
      } while (0)
#endif

      grammar_destroy (arbprogram_syn_id);
      return GL_FALSE;
   }

   grammar_destroy (arbprogram_syn_id);

   /*
    * Program string is syntactically correct at this point
    * Parse the tokenized version of the program now, generating
    * vertex/fragment program instructions.
    */

   /* Initialize the arb_program struct */
   program->Base.String = strz;
   program->Base.Instructions = (struct prog_instruction *)
      _mesa_malloc(MAX_INSTRUCTIONS * sizeof(struct prog_instruction));
   program->Base.NumInstructions =
   program->Base.NumTemporaries =
   program->Base.NumParameters =
   program->Base.NumAttributes = program->Base.NumAddressRegs = 0;
   program->Base.Parameters = _mesa_new_parameter_list ();
   program->Base.InputsRead = 0x0;
   program->Base.OutputsWritten = 0x0;
   program->Position = 0;
   program->MajorVersion = program->MinorVersion = 0;
   program->PrecisionOption = GL_DONT_CARE;
   program->FogOption = GL_NONE;
   program->HintPositionInvariant = GL_FALSE;
   for (a = 0; a < MAX_TEXTURE_IMAGE_UNITS; a++)
      program->TexturesUsed[a] = 0x0;
   program->NumAluInstructions =
   program->NumTexInstructions =
   program->NumTexIndirections = 0;
   program->UsesKill = 0;

   vc_head = NULL;
   err = GL_FALSE;

   /* Start examining the tokens in the array */
   inst = parsed;

   /* Check the grammer rev */
   if (*inst++ != REVISION) {
      _mesa_set_program_error (ctx, 0, "Grammar version mismatch");
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glProgramStringARB(Grammar version mismatch)");
      err = GL_TRUE;
   }
   else {
      /* ignore program target */
      inst++;
      err = parse_instructions(ctx, inst, &vc_head, program);
   }

   /*debug_variables(ctx, vc_head, program); */

   /* We're done with the parsed binary array */
   var_cache_destroy (&vc_head);

   _mesa_free (parsed);

   /* Reallocate the instruction array from size [MAX_INSTRUCTIONS]
    * to size [ap.Base.NumInstructions].
    */
   program->Base.Instructions = (struct prog_instruction *)
      _mesa_realloc(program->Base.Instructions,
             MAX_INSTRUCTIONS * sizeof(struct prog_instruction),/*orig*/
             program->Base.NumInstructions * sizeof(struct prog_instruction));
   
   return !err;
}



void
_mesa_parse_arb_fragment_program(GLcontext* ctx, GLenum target,
                                 const GLvoid *str, GLsizei len,
                                 struct fragment_program *program)
{
   struct arb_program ap;
   GLuint i;

   ASSERT(target == GL_FRAGMENT_PROGRAM_ARB);
   if (!_mesa_parse_arb_program(ctx, target, (const GLubyte*) str, len, &ap)) {
      /* Error in the program. Just return. */
      return;
   }

   /* Copy the relevant contents of the arb_program struct into the
    * fragment_program struct.
    */
   program->Base.String          = ap.Base.String;
   program->Base.NumInstructions = ap.Base.NumInstructions;
   program->Base.NumTemporaries  = ap.Base.NumTemporaries;
   program->Base.NumParameters   = ap.Base.NumParameters;
   program->Base.NumAttributes   = ap.Base.NumAttributes;
   program->Base.NumAddressRegs  = ap.Base.NumAddressRegs;
   program->NumAluInstructions   = ap.NumAluInstructions;
   program->NumTexInstructions   = ap.NumTexInstructions;
   program->NumTexIndirections   = ap.NumTexIndirections;
   program->NumNativeAluInstructions = ap.NumAluInstructions;
   program->NumNativeTexInstructions = ap.NumTexInstructions;
   program->NumNativeTexIndirections = ap.NumTexIndirections;
   program->Base.InputsRead      = ap.Base.InputsRead;
   program->Base.OutputsWritten  = ap.Base.OutputsWritten;
   for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
      program->TexturesUsed[i] = ap.TexturesUsed[i];
   program->FogOption          = ap.FogOption;

   if (program->Base.Instructions)
      _mesa_free(program->Base.Instructions);
   program->Base.Instructions = ap.Base.Instructions;

   if (program->Base.Parameters)
      _mesa_free_parameter_list(program->Base.Parameters);
   program->Base.Parameters    = ap.Base.Parameters;

#if DEBUG_FP
   _mesa_print_program(&program.Base);
#endif
}



/**
 * Parse the vertex program string.  If success, update the given
 * vertex_program object with the new program.  Else, leave the vertex_program
 * object unchanged.
 */
void
_mesa_parse_arb_vertex_program(GLcontext *ctx, GLenum target,
			       const GLvoid *str, GLsizei len,
			       struct vertex_program *program)
{
   struct arb_program ap;

   ASSERT(target == GL_VERTEX_PROGRAM_ARB);

   if (!_mesa_parse_arb_program(ctx, target, (const GLubyte*) str, len, &ap)) {
      /* Error in the program. Just return. */
      return;
   }

   /* Copy the relevant contents of the arb_program struct into the 
    * vertex_program struct.
    */
   program->Base.String          = ap.Base.String;
   program->Base.NumInstructions = ap.Base.NumInstructions;
   program->Base.NumTemporaries  = ap.Base.NumTemporaries;
   program->Base.NumParameters   = ap.Base.NumParameters;
   program->Base.NumAttributes   = ap.Base.NumAttributes;
   program->Base.NumAddressRegs  = ap.Base.NumAddressRegs;
   program->Base.InputsRead     = ap.Base.InputsRead;
   program->Base.OutputsWritten = ap.Base.OutputsWritten;
   program->IsPositionInvariant = ap.HintPositionInvariant;

   if (program->Base.Instructions)
      _mesa_free(program->Base.Instructions);
   program->Base.Instructions = ap.Base.Instructions;

   if (program->Base.Parameters)
      _mesa_free_parameter_list(program->Base.Parameters);
   program->Base.Parameters = ap.Base.Parameters; 

#if DEBUG_VP
   _mesa_print_program(&program->Base);
#endif
}