summaryrefslogtreecommitdiff
path: root/src/gallium/drivers/i965/brw_wm_fp.c
blob: f7ee55cc1c85b03b3a37276b0155a726fe978d2a (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
/*
 Copyright (C) Intel Corp.  2006.  All Rights Reserved.
 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
 develop this 3D driver.
 
 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 (including the
 next paragraph) 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 THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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.
 
 **********************************************************************/
 /*
  * Authors:
  *   Keith Whitwell <keith@tungstengraphics.com>
  */
               

#include "pipe/p_shader_tokens.h"

#include "util/u_math.h"
#include "util/u_memory.h"

#include "tgsi/tgsi_parse.h"
#include "tgsi/tgsi_dump.h"
#include "tgsi/tgsi_info.h"
#include "tgsi/tgsi_util.h"

#include "brw_wm.h"
#include "brw_debug.h"


/***********************************************************************
 * Source regs
 */

static struct brw_fp_src src_reg(GLuint file, GLuint idx)
{
   struct brw_fp_src reg;
   reg.file = file;
   reg.index = idx;
   reg.swizzle = BRW_SWIZZLE_XYZW;
   reg.indirect = 0;
   reg.negate = 0;
   reg.abs = 0;
   return reg;
}

static struct brw_fp_src src_reg_from_dst(struct brw_fp_dst dst)
{
   return src_reg(dst.file, dst.index);
}

static struct brw_fp_src src_undef( void )
{
   return src_reg(TGSI_FILE_NULL, 0);
}

static GLboolean src_is_undef(struct brw_fp_src src)
{
   return src.file == TGSI_FILE_NULL;
}

static struct brw_fp_src src_swizzle( struct brw_fp_src reg, int x, int y, int z, int w )
{
   unsigned swz = reg.swizzle;

   reg.swizzle = ( BRW_GET_SWZ(swz, x) << 0 |
		   BRW_GET_SWZ(swz, y) << 2 |
		   BRW_GET_SWZ(swz, z) << 4 |
		   BRW_GET_SWZ(swz, w) << 6 );

   return reg;
}

static struct brw_fp_src src_scalar( struct brw_fp_src reg, int x )
{
   return src_swizzle(reg, x, x, x, x);
}

static struct brw_fp_src src_abs( struct brw_fp_src src )
{
   src.negate = 0;
   src.abs = 1;
   return src;
}

static struct brw_fp_src src_negate( struct brw_fp_src src )
{
   src.negate = 1;
   src.abs = 0;
   return src;
}


static int match_or_expand_immediate( const float *v,
                                      unsigned nr,
                                      float *v2,
                                      unsigned *nr2,
                                      unsigned *swizzle )
{
   unsigned i, j;
   
   *swizzle = 0;

   for (i = 0; i < nr; i++) {
      boolean found = FALSE;

      for (j = 0; j < *nr2 && !found; j++) {
         if (v[i] == v2[j]) {
            *swizzle |= j << (i * 2);
            found = TRUE;
         }
      }

      if (!found) {
         if (*nr2 >= 4) 
            return FALSE;

         v2[*nr2] = v[i];
         *swizzle |= *nr2 << (i * 2);
         (*nr2)++;
      }
   }

   return TRUE;
}



/* Internally generated immediates: overkill...
 */
static struct brw_fp_src src_imm( struct brw_wm_compile *c, 
				  const GLfloat *v, 
				  unsigned nr)
{
   unsigned i, j;
   unsigned swizzle;

   /* Could do a first pass where we examine all existing immediates
    * without expanding.
    */

   for (i = 0; i < c->nr_immediates; i++) {
      if (match_or_expand_immediate( v, 
                                     nr,
                                     c->immediate[i].v,
                                     &c->immediate[i].nr, 
                                     &swizzle ))
         goto out;
   }

   if (c->nr_immediates < Elements(c->immediate)) {
      i = c->nr_immediates++;
      if (match_or_expand_immediate( v,
                                     nr,
                                     c->immediate[i].v,
                                     &c->immediate[i].nr, 
                                     &swizzle ))
         goto out;
   }

   c->error = 1;
   return src_undef();

out:
   /* Make sure that all referenced elements are from this immediate.
    * Has the effect of making size-one immediates into scalars.
    */
   for (j = nr; j < 4; j++)
      swizzle |= (swizzle & 0x3) << (j * 2);

   return src_swizzle( src_reg( TGSI_FILE_IMMEDIATE, i ),
		       BRW_GET_SWZ(swizzle, X),
		       BRW_GET_SWZ(swizzle, Y),
		       BRW_GET_SWZ(swizzle, Z),
		       BRW_GET_SWZ(swizzle, W) );
}



static struct brw_fp_src src_imm1f( struct brw_wm_compile *c,
				    GLfloat f )
{
   return src_imm(c, &f, 1);
}

static struct brw_fp_src src_imm4f( struct brw_wm_compile *c,
				    GLfloat x,
				    GLfloat y,
				    GLfloat z,
				    GLfloat w)
{
   GLfloat f[4] = {x,y,z,w};
   return src_imm(c, f, 4);
}



/***********************************************************************
 * Dest regs
 */

static struct brw_fp_dst dst_reg(GLuint file, GLuint idx)
{
   struct brw_fp_dst reg;
   reg.file = file;
   reg.index = idx;
   reg.writemask = BRW_WRITEMASK_XYZW;
   reg.indirect = 0;
   reg.saturate = 0;
   return reg;
}

static struct brw_fp_dst dst_mask( struct brw_fp_dst reg, int mask )
{
   reg.writemask &= mask;
   return reg;
}

static struct brw_fp_dst dst_undef( void )
{
   return dst_reg(TGSI_FILE_NULL, 0);
}

static boolean dst_is_undef( struct brw_fp_dst dst )
{
   return dst.file == TGSI_FILE_NULL;
}

static struct brw_fp_dst dst_saturate( struct brw_fp_dst reg, boolean flag )
{
   reg.saturate = flag;
   return reg;
}

static struct brw_fp_dst get_temp( struct brw_wm_compile *c )
{
   int bit = ffs( ~c->fp_temp );

   if (!bit) {
      debug_printf("%s: out of temporaries\n", __FILE__);
   }

   c->fp_temp |= 1<<(bit-1);
   return dst_reg(TGSI_FILE_TEMPORARY, c->fp_first_internal_temp+(bit-1));
}


static void release_temp( struct brw_wm_compile *c, struct brw_fp_dst temp )
{
   c->fp_temp &= ~(1 << (temp.index - c->fp_first_internal_temp));
}


/***********************************************************************
 * Instructions 
 */

static struct brw_fp_instruction *get_fp_inst(struct brw_wm_compile *c)
{
   return &c->fp_instructions[c->nr_fp_insns++];
}

static struct brw_fp_instruction * emit_tex_op(struct brw_wm_compile *c,
					     GLuint op,
					     struct brw_fp_dst dest,
					     GLuint tex_unit,
					     GLuint target,
					     GLuint sampler,
					     struct brw_fp_src src0,
					     struct brw_fp_src src1,
					     struct brw_fp_src src2 )
{
   struct brw_fp_instruction *inst = get_fp_inst(c);

   if (tex_unit || target)
      assert(op == TGSI_OPCODE_TXP ||
             op == TGSI_OPCODE_TXB ||
             op == TGSI_OPCODE_TEX ||
             op == WM_FB_WRITE);

   inst->opcode = op;
   inst->dst = dest;
   inst->tex_unit = tex_unit;
   inst->target = target;
   inst->sampler = sampler;
   inst->src[0] = src0;
   inst->src[1] = src1;
   inst->src[2] = src2;

   return inst;
}
   

static INLINE void emit_op3(struct brw_wm_compile *c,
			    GLuint op,
			    struct brw_fp_dst dest,
			    struct brw_fp_src src0,
			    struct brw_fp_src src1,
			    struct brw_fp_src src2 )
{
   emit_tex_op(c, op, dest, 0, 0, 0, src0, src1, src2);
}


static INLINE void emit_op2(struct brw_wm_compile *c,
			    GLuint op,
			    struct brw_fp_dst dest,
			    struct brw_fp_src src0,
			    struct brw_fp_src src1)
{
   emit_tex_op(c, op, dest, 0, 0, 0, src0, src1, src_undef());
}

static INLINE void emit_op1(struct brw_wm_compile *c,
			    GLuint op,
			    struct brw_fp_dst dest,
			    struct brw_fp_src src0)
{
   emit_tex_op(c, op, dest, 0, 0, 0, src0, src_undef(), src_undef());
}

static INLINE void emit_op0(struct brw_wm_compile *c,
			   GLuint op,
			   struct brw_fp_dst dest)
{
   emit_tex_op(c, op, dest, 0, 0, 0, src_undef(), src_undef(), src_undef());
}



/* Many opcodes produce the same value across all the result channels.
 * We'd rather not have to support that splatting in the opcode implementations,
 * and brw_wm_pass*.c wants to optimize them out by shuffling references around
 * anyway.  We can easily get both by emitting the opcode to one channel, and
 * then MOVing it to the others, which brw_wm_pass*.c already understands.
 */
static void emit_scalar_insn(struct brw_wm_compile *c,
			     unsigned opcode,
			     struct brw_fp_dst dst,
			     struct brw_fp_src src0,
			     struct brw_fp_src src1,
			     struct brw_fp_src src2 )
{
   unsigned first_chan = ffs(dst.writemask) - 1;
   unsigned first_mask = 1 << first_chan;

   if (dst.writemask == 0)
      return;

   emit_op3( c, opcode,
	     dst_mask(dst, first_mask),
	     src0, src1, src2 );

   if (dst.writemask != first_mask) {
      emit_op1(c, TGSI_OPCODE_MOV,
	       dst_mask(dst, ~first_mask),
	       src_scalar(src_reg_from_dst(dst), first_chan));
   }
}


/***********************************************************************
 * Special instructions for interpolation and other tasks
 */

static struct brw_fp_src get_pixel_xy( struct brw_wm_compile *c )
{
   if (src_is_undef(c->fp_pixel_xy)) {
      struct brw_fp_dst pixel_xy = get_temp(c);
      struct brw_fp_src payload_r0_depth = src_reg(BRW_FILE_PAYLOAD, PAYLOAD_DEPTH);
      
      
      /* Emit the out calculations, and hold onto the results.  Use
       * two instructions as a temporary is required.
       */   
      /* pixel_xy.xy = PIXELXY payload[0];
       */
      emit_op1(c,
	       WM_PIXELXY,
	       dst_mask(pixel_xy, BRW_WRITEMASK_XY),
	       payload_r0_depth);

      c->fp_pixel_xy = src_reg_from_dst(pixel_xy);
   }

   return c->fp_pixel_xy;
}

static struct brw_fp_src get_delta_xy( struct brw_wm_compile *c )
{
   if (src_is_undef(c->fp_delta_xy)) {
      struct brw_fp_dst delta_xy = get_temp(c);
      struct brw_fp_src pixel_xy = get_pixel_xy(c);
      struct brw_fp_src payload_r0_depth = src_reg(BRW_FILE_PAYLOAD, PAYLOAD_DEPTH);
      
      /* deltas.xy = DELTAXY pixel_xy, payload[0]
       */
      emit_op3(c,
	      WM_DELTAXY,
	      dst_mask(delta_xy, BRW_WRITEMASK_XY),
	      pixel_xy, 
	      payload_r0_depth,
	      src_undef());
      
      c->fp_delta_xy = src_reg_from_dst(delta_xy);
   }

   return c->fp_delta_xy;
}

static struct brw_fp_src get_pixel_w( struct brw_wm_compile *c )
{
   if (src_is_undef(c->fp_pixel_w)) {
      struct brw_fp_dst pixel_w = get_temp(c);
      struct brw_fp_src deltas = get_delta_xy(c);

      /* XXX: assuming position is always first -- valid? 
       */
      struct brw_fp_src interp_wpos = src_reg(BRW_FILE_PAYLOAD, 0);

      /* deltas.xyw = DELTAS2 deltas.xy, payload.interp_wpos.x
       */
      emit_op3(c,
	       WM_PIXELW,
	       dst_mask(pixel_w, BRW_WRITEMASK_W),
	       interp_wpos,
	       deltas, 
	       src_undef());
      

      c->fp_pixel_w = src_reg_from_dst(pixel_w);
   }

   return c->fp_pixel_w;
}


/***********************************************************************
 * Emit INTERP instructions ahead of first use of each attrib.
 */

static void emit_interp( struct brw_wm_compile *c,
			 GLuint idx,
			 GLuint semantic,
			 GLuint interp_mode )
{
   struct brw_fp_dst dst = dst_reg(TGSI_FILE_INPUT, idx);
   struct brw_fp_src interp = src_reg(BRW_FILE_PAYLOAD, idx);
   struct brw_fp_src deltas = get_delta_xy(c);

   /* Need to use PINTERP on attributes which have been
    * multiplied by 1/W in the SF program, and LINTERP on those
    * which have not:
    */
   switch (semantic) {
   case TGSI_SEMANTIC_POSITION:
      /* Have to treat wpos.xy specially:
       */
      emit_op1(c,
	      WM_WPOSXY,
	      dst_mask(dst, BRW_WRITEMASK_XY),
	      get_pixel_xy(c));
      
      /* TGSI_FILE_INPUT.attr.xyzw = INTERP payload.interp[attr].x, deltas.xyw
       */
      emit_op2(c,
	       WM_LINTERP,
	       dst_mask(dst, BRW_WRITEMASK_ZW),
	       interp,
	       deltas);
      break;

   case TGSI_SEMANTIC_COLOR:
      if (c->key.flat_shade) {
	 emit_op1(c,
		 WM_CINTERP,
		 dst,
		 interp);
      }
      else if (interp_mode == TGSI_INTERPOLATE_LINEAR) {
	 emit_op2(c,
		  WM_LINTERP,
		  dst,
		  interp,
		  deltas);
      }
      else {
	 emit_op3(c,
		  WM_PINTERP,
		  dst,
		  interp,
		  deltas,
		  get_pixel_w(c));
      }

      break;

   case TGSI_SEMANTIC_FOG:
      /* Interpolate the fog coordinate */
      emit_op3(c,
	      WM_PINTERP,
	      dst_mask(dst, BRW_WRITEMASK_X),
	      interp,
	      deltas,
	      get_pixel_w(c));

      emit_op1(c,
	       TGSI_OPCODE_MOV,
	       dst_mask(dst, BRW_WRITEMASK_YZ),
	       src_imm1f(c, 0.0));

      emit_op1(c,
	       TGSI_OPCODE_MOV,
	       dst_mask(dst, BRW_WRITEMASK_W),
	       src_imm1f(c, 1.0));
      break;

   case TGSI_SEMANTIC_FACE:
      /* XXX review/test this case */
      emit_op0(c,
	       WM_FRONTFACING,
	       dst_mask(dst, BRW_WRITEMASK_X));
      
      emit_op1(c,
	      TGSI_OPCODE_MOV,
	      dst_mask(dst, BRW_WRITEMASK_YZ),
	       src_imm1f(c, 0.0));

      emit_op1(c,
	      TGSI_OPCODE_MOV,
	      dst_mask(dst, BRW_WRITEMASK_W),
	       src_imm1f(c, 1.0));
      break;

   case TGSI_SEMANTIC_PSIZE:
      /* XXX review/test this case */
      emit_op3(c,
	       WM_PINTERP,
	       dst_mask(dst, BRW_WRITEMASK_XY),
	       interp,
	       deltas,
	       get_pixel_w(c));

      emit_op1(c,
	      TGSI_OPCODE_MOV,
	      dst_mask(dst, BRW_WRITEMASK_Z),
	      src_imm1f(c, 0.0f));

      emit_op1(c,
	      TGSI_OPCODE_MOV,
	      dst_mask(dst, BRW_WRITEMASK_W),
	      src_imm1f(c, 1.0f));
      break;

   default: 
      switch (interp_mode) {
      case TGSI_INTERPOLATE_CONSTANT:
	 emit_op1(c,
		  WM_CINTERP,
		  dst,
		  interp);
	 break;

      case TGSI_INTERPOLATE_LINEAR:
	 emit_op2(c,
		  WM_LINTERP,
		  dst,
		  interp,
		  deltas);
	 break;

      case TGSI_INTERPOLATE_PERSPECTIVE:
	 emit_op3(c,
		  WM_PINTERP,
		  dst,
		  interp,
		  deltas,
		  get_pixel_w(c));
	 break;
      }
      break;
   }
}


/***********************************************************************
 * Expand various instructions here to simpler forms.  
 */
static void precalc_dst( struct brw_wm_compile *c,
			 struct brw_fp_dst dst,
			 struct brw_fp_src src0,
			 struct brw_fp_src src1 )
{
   if (dst.writemask & BRW_WRITEMASK_Y) {      
      /* dst.y = mul src0.y, src1.y
       */
      emit_op2(c,
	       TGSI_OPCODE_MUL,
	       dst_mask(dst, BRW_WRITEMASK_Y),
	       src0,
	       src1);
   }

   if (dst.writemask & BRW_WRITEMASK_XZ) {
      /* dst.z = mov src0.zzzz
       */
      emit_op1(c,
	      TGSI_OPCODE_MOV,
	      dst_mask(dst, BRW_WRITEMASK_Z),
	      src_scalar(src0, Z));

      /* dst.x = imm1f(1.0)
       */
      emit_op1(c,
	      TGSI_OPCODE_MOV,
	      dst_saturate(dst_mask(dst, BRW_WRITEMASK_X), 0),
	      src_imm1f(c, 1.0));
   }
   if (dst.writemask & BRW_WRITEMASK_W) {
      /* dst.w = mov src1.w
       */
      emit_op1(c,
	       TGSI_OPCODE_MOV,
	       dst_mask(dst, BRW_WRITEMASK_W),
	       src1);
   }
}


static void precalc_lit( struct brw_wm_compile *c,
			 struct brw_fp_dst dst,
			 struct brw_fp_src src0 )
{
   if (dst.writemask & BRW_WRITEMASK_XW) {
      /* dst.xw = imm(1.0f)
       */
      emit_op1(c,
	       TGSI_OPCODE_MOV,
	       dst_saturate(dst_mask(dst, BRW_WRITEMASK_XW), 0),
	       src_imm1f(c, 1.0f));
   }

   if (dst.writemask & BRW_WRITEMASK_YZ) {
      emit_op1(c,
	       TGSI_OPCODE_LIT,
	       dst_mask(dst, BRW_WRITEMASK_YZ),
	       src0);
   }
}


/**
 * Some TEX instructions require extra code, cube map coordinate
 * normalization, or coordinate scaling for RECT textures, etc.
 * This function emits those extra instructions and the TEX
 * instruction itself.
 */
static void precalc_tex( struct brw_wm_compile *c,
			 struct brw_fp_dst dst,
			 unsigned target,
			 unsigned unit,
			 struct brw_fp_src src0,
			 struct brw_fp_src sampler )
{
   struct brw_fp_src coord;
   struct brw_fp_dst tmp = dst_undef();

   assert(unit < BRW_MAX_TEX_UNIT);

   /* Cubemap: find longest component of coord vector and normalize
    * it.
    */
   if (target == TGSI_TEXTURE_CUBE) {
      struct brw_fp_src tmpsrc;

      tmp = get_temp(c);
      tmpsrc = src_reg_from_dst(tmp);

      /* tmp = abs(src0) */
      emit_op1(c, 
	       TGSI_OPCODE_MOV,
	       tmp,
	       src_abs(src0));

      /* tmp.X = MAX(tmp.X, tmp.Y) */
      emit_op2(c, TGSI_OPCODE_MAX,
	       dst_mask(tmp, BRW_WRITEMASK_X),
	       src_scalar(tmpsrc, X),
	       src_scalar(tmpsrc, Y));

      /* tmp.X = MAX(tmp.X, tmp.Z) */
      emit_op2(c, TGSI_OPCODE_MAX,
	       dst_mask(tmp, BRW_WRITEMASK_X),
	       tmpsrc,
	       src_scalar(tmpsrc, Z));

      /* tmp.X = 1 / tmp.X */
      emit_op1(c, TGSI_OPCODE_RCP,
	      dst_mask(tmp, BRW_WRITEMASK_X),
	      tmpsrc);

      /* tmp = src0 * tmp.xxxx */
      emit_op2(c, TGSI_OPCODE_MUL,
	       tmp,
	       src0,
	       src_scalar(tmpsrc, X));

      coord = tmpsrc;
   }
   else if (target == TGSI_TEXTURE_RECT ||
	    target == TGSI_TEXTURE_SHADOWRECT) {
      /* XXX: need a mechanism for internally generated constants.
       */
      coord = src0;
   }
   else {
      coord = src0;
   }

   /* Need to emit YUV texture conversions by hand.  Probably need to
    * do this here - the alternative is in brw_wm_emit.c, but the
    * conversion requires allocating a temporary variable which we
    * don't have the facility to do that late in the compilation.
    */
   if (c->key.yuvtex_mask & (1 << unit)) {
      /* convert ycbcr to RGBA */
      GLboolean  swap_uv = c->key.yuvtex_swap_mask & (1<<unit);
      struct brw_fp_dst tmp = get_temp(c);
      struct brw_fp_src tmpsrc = src_reg_from_dst(tmp);
      struct brw_fp_src C0 = src_imm4f( c,  -.5, -.0625, -.5, 1.164 );
      struct brw_fp_src C1 = src_imm4f( c, 1.596, -0.813, 2.018, -.391 );
     
      /* tmp     = TEX ...
       */
      emit_tex_op(c, 
                  TGSI_OPCODE_TEX,
                  dst_saturate(tmp, dst.saturate),
                  unit,
                  target,
                  sampler.index,
                  coord,
                  src_undef(),
                  src_undef());

      /* tmp.xyz =  ADD TMP, C0
       */
      emit_op2(c, TGSI_OPCODE_ADD,
	       dst_mask(tmp, BRW_WRITEMASK_XYZ),
	       tmpsrc,
	       C0);

      /* YUV.y   = MUL YUV.y, C0.w
       */
      emit_op2(c, TGSI_OPCODE_MUL,
	       dst_mask(tmp, BRW_WRITEMASK_Y),
	       tmpsrc,
	       src_scalar(C0, W));

      /* 
       * if (UV swaped)
       *     RGB.xyz = MAD YUV.zzx, C1, YUV.y
       * else
       *     RGB.xyz = MAD YUV.xxz, C1, YUV.y
       */

      emit_op3(c, TGSI_OPCODE_MAD,
	       dst_mask(dst, BRW_WRITEMASK_XYZ),
	       ( swap_uv ? 
		 src_swizzle(tmpsrc, Z,Z,X,X) : 
		 src_swizzle(tmpsrc, X,X,Z,Z)),
	       C1,
	       src_scalar(tmpsrc, Y));

      /*  RGB.y   = MAD YUV.z, C1.w, RGB.y
       */
      emit_op3(c,
	       TGSI_OPCODE_MAD,
	       dst_mask(dst, BRW_WRITEMASK_Y),
	       src_scalar(tmpsrc, Z),
	       src_scalar(C1, W),
	       src_scalar(src_reg_from_dst(dst), Y));

      release_temp(c, tmp);
   }
   else {
      /* ordinary RGBA tex instruction */
      emit_tex_op(c, 
                  TGSI_OPCODE_TEX,
                  dst,
                  unit,
                  target,
                  sampler.index,
                  coord,
                  src_undef(),
                  src_undef());
   }

   /* XXX: add GL_EXT_texture_swizzle support to gallium -- by
    * generating shader varients in mesa state tracker.
    */

   /* Release this temp if we ended up allocating it:
    */
   if (!dst_is_undef(tmp))
      release_temp(c, tmp);
}


/**
 * Check if the given TXP instruction really needs the divide-by-W step.
 */
static GLboolean projtex( struct brw_wm_compile *c,
			  unsigned target, 
			  struct brw_fp_src src )
{
   /* Only try to detect the simplest cases.  Could detect (later)
    * cases where we are trying to emit code like RCP {1.0}, MUL x,
    * {1.0}, and so on.
    *
    * More complex cases than this typically only arise from
    * user-provided fragment programs anyway:
    */
   if (target == TGSI_TEXTURE_CUBE)
      return GL_FALSE;  /* ut2004 gun rendering !?! */
   
   if (src.file == TGSI_FILE_INPUT && 
       BRW_GET_SWZ(src.swizzle, W) == W &&
       c->fp->info.input_interpolate[src.index] != TGSI_INTERPOLATE_PERSPECTIVE)
      return GL_FALSE;

   return GL_TRUE;
}


/**
 * Emit code for TXP.
 */
static void precalc_txp( struct brw_wm_compile *c,
			 struct brw_fp_dst dst,
			 unsigned target,
			 unsigned unit,
			 struct brw_fp_src src0,
                         struct brw_fp_src sampler )
{
   if (projtex(c, target, src0)) {
      struct brw_fp_dst tmp = get_temp(c);

      /* tmp0.w = RCP inst.arg[0][3]
       */
      emit_op1(c,
	      TGSI_OPCODE_RCP,
	      dst_mask(tmp, BRW_WRITEMASK_W),
	      src_scalar(src0, W));

      /* tmp0.xyz =  MUL inst.arg[0], tmp0.wwww
       */
      emit_op2(c,
	       TGSI_OPCODE_MUL,
	       dst_mask(tmp, BRW_WRITEMASK_XYZ),
	       src0,
	       src_scalar(src_reg_from_dst(tmp), W));

      /* dst = TEX tmp0
       */
      precalc_tex(c, 
		  dst,
		  target,
		  unit,
		  src_reg_from_dst(tmp),
                  sampler );

      release_temp(c, tmp);
   }
   else
   {
      /* dst = TEX src0
       */
      precalc_tex(c, dst, target, unit, src0, sampler);
   }
}


/* XXX: note this returns a src_reg.
 */
static struct brw_fp_src
find_output_by_semantic( struct brw_wm_compile *c,
			 unsigned semantic,
			 unsigned index )
{
   const struct tgsi_shader_info *info = &c->fp->info;
   unsigned i;

   for (i = 0; i < info->num_outputs; i++)
      if (info->output_semantic_name[i] == semantic &&
	  info->output_semantic_index[i] == index)
	 return src_reg( TGSI_FILE_OUTPUT, i );

   /* If not found, return some arbitrary immediate value:
    *
    * XXX: this is a good idea but immediates are up generating extra
    * curbe entries atm, as they would have in the original driver.
    */
   return src_reg( TGSI_FILE_OUTPUT, 0 ); /* src_imm1f(c, 1.0); */
}


static void emit_fb_write( struct brw_wm_compile *c )
{
   struct brw_fp_src payload_r0_depth = src_reg(BRW_FILE_PAYLOAD, PAYLOAD_DEPTH);
   struct brw_fp_src outdepth = find_output_by_semantic(c, TGSI_SEMANTIC_POSITION, 0);
   GLuint i;


   outdepth = src_scalar(outdepth, Z);

   for (i = 0 ; i < c->key.nr_cbufs; i++) {
      struct brw_fp_src outcolor;
      
      outcolor = find_output_by_semantic(c, TGSI_SEMANTIC_COLOR, i);

      /* Use emit_tex_op so that we can specify the inst->target
       * field, which is abused to contain the FB write target and the
       * EOT marker
       */
      emit_tex_op(c, WM_FB_WRITE,
		  dst_undef(),
		  (i == c->key.nr_cbufs - 1), /* EOT */
		  i,
                  0,            /* no sampler */
		  outcolor,
		  payload_r0_depth,
		  outdepth);
   }
}


static struct brw_fp_dst translate_dst( struct brw_wm_compile *c,
					const struct tgsi_full_dst_register *dst,
					unsigned saturate )
{
   struct brw_fp_dst out;

   out.file = dst->Register.File;
   out.index = dst->Register.Index;
   out.writemask = dst->Register.WriteMask;
   out.indirect = dst->Register.Indirect;
   out.saturate = (saturate == TGSI_SAT_ZERO_ONE);
   
   if (out.indirect) {
      assert(dst->Indirect.File == TGSI_FILE_ADDRESS);
      assert(dst->Indirect.Index == 0);
   }
   
   return out;
}


static struct brw_fp_src translate_src( struct brw_wm_compile *c,
					const struct tgsi_full_src_register *src )
{
   struct brw_fp_src out;

   out.file = src->Register.File;
   out.index = src->Register.Index;
   out.indirect = src->Register.Indirect;

   out.swizzle = ((src->Register.SwizzleX << 0) |
		  (src->Register.SwizzleY << 2) |
		  (src->Register.SwizzleZ << 4) |
		  (src->Register.SwizzleW << 6));
   
   switch (tgsi_util_get_full_src_register_sign_mode( src, 0 )) {
   case TGSI_UTIL_SIGN_CLEAR:
      out.abs = 1;
      out.negate = 0;
      break;

   case TGSI_UTIL_SIGN_SET:
      out.abs = 1;
      out.negate = 1;
      break;

   case TGSI_UTIL_SIGN_TOGGLE:
      out.abs = 0;
      out.negate = 1;
      break;

   case TGSI_UTIL_SIGN_KEEP:
   default:
      out.abs = 0;
      out.negate = 0;
      break;
   }

   if (out.indirect) {
      assert(src->Indirect.File == TGSI_FILE_ADDRESS);
      assert(src->Indirect.Index == 0);
   }
   
   return out;
}



static void emit_insn( struct brw_wm_compile *c,
		       const struct tgsi_full_instruction *inst )
{
   unsigned opcode = inst->Instruction.Opcode;
   struct brw_fp_dst dst;
   struct brw_fp_src src[3];
   int i;

   dst = translate_dst( c, &inst->Dst[0],
			inst->Instruction.Saturate );

   for (i = 0; i < inst->Instruction.NumSrcRegs; i++)
      src[i] = translate_src( c, &inst->Src[i] );
   
   switch (opcode) {
   case TGSI_OPCODE_ABS:
      emit_op1(c, TGSI_OPCODE_MOV,
	       dst, 
	       src_abs(src[0]));
      break;

   case TGSI_OPCODE_SUB: 
      emit_op2(c, TGSI_OPCODE_ADD,
	       dst,
	       src[0],
	       src_negate(src[1]));
      break;

   case TGSI_OPCODE_SCS: 
      emit_op1(c, TGSI_OPCODE_SCS,
	       dst_mask(dst, BRW_WRITEMASK_XY),
	       src[0]);
      break;
	 
   case TGSI_OPCODE_DST:
      precalc_dst(c, dst, src[0], src[1]);
      break;

   case TGSI_OPCODE_LIT:
      precalc_lit(c, dst, src[0]);
      break;

   case TGSI_OPCODE_TEX:
      precalc_tex(c, dst,
		  inst->Texture.Texture,
		  src[1].index,	/* use sampler unit for tex idx */
		  src[0],       /* coord */
                  src[1]);      /* sampler */
      break;

   case TGSI_OPCODE_TXP:
      precalc_txp(c, dst,
		  inst->Texture.Texture,
		  src[1].index,	/* use sampler unit for tex idx */
		  src[0],       /* coord */
                  src[1]);      /* sampler */
      break;

   case TGSI_OPCODE_TXB:
      /* XXX: TXB not done
       */
      precalc_tex(c, dst,
		  inst->Texture.Texture,
		  src[1].index,	/* use sampler unit for tex idx*/
		  src[0],
                  src[1]);
      break;

   case TGSI_OPCODE_XPD: 
      emit_op2(c, TGSI_OPCODE_XPD,
	       dst_mask(dst, BRW_WRITEMASK_XYZ),
	       src[0], 
	       src[1]);
      break;

   case TGSI_OPCODE_KIL: 
      emit_op1(c, TGSI_OPCODE_KIL,
	       dst_mask(dst_undef(), 0),
	       src[0]);
      break;

   case TGSI_OPCODE_END:
      emit_fb_write(c);
      break;
   default:
      if (!c->key.has_flow_control &&
	  brw_wm_is_scalar_result(opcode))
	 emit_scalar_insn(c, opcode, dst, src[0], src[1], src[2]);
      else
	 emit_op3(c, opcode, dst, src[0], src[1], src[2]);
      break;
   }
}

/**
 * Initial pass for fragment program code generation.
 * This function is used by both the GLSL and non-GLSL paths.
 */
int brw_wm_pass_fp( struct brw_wm_compile *c )
{
   struct brw_fragment_shader *fs = c->fp;
   struct tgsi_parse_context parse;
   struct tgsi_full_instruction *inst;
   struct tgsi_full_declaration *decl;
   const float *imm;
   GLuint size;
   GLuint i;

   if (BRW_DEBUG & DEBUG_WM) {
      debug_printf("pre-fp:\n");
      tgsi_dump(fs->tokens, 0); 
   }

   c->fp_pixel_xy = src_undef();
   c->fp_delta_xy = src_undef();
   c->fp_pixel_w = src_undef();
   c->nr_fp_insns = 0;
   c->nr_immediates = 0;


   /* Loop over all instructions doing assorted simplifications and
    * transformations.
    */
   tgsi_parse_init( &parse, fs->tokens );
   while( !tgsi_parse_end_of_tokens( &parse ) ) {
      tgsi_parse_token( &parse );

      switch( parse.FullToken.Token.Type ) {
      case TGSI_TOKEN_TYPE_DECLARATION:
	 /* Turn intput declarations into special WM_* instructions.
	  *
	  * XXX: For non-branching shaders, consider deferring variable
	  * initialization as late as possible to minimize register
	  * usage.  This is how the original BRW driver worked.
	  *
	  * In a branching shader, must preamble instructions at decl
	  * time, as instruction order in the shader does not
	  * correspond to the order instructions are executed in the
	  * wild.
	  *
	  * This is where special instructions such as WM_CINTERP,
	  * WM_LINTERP, WM_PINTERP and WM_WPOSXY are emitted to
	  * compute shader inputs from the payload registers and pixel
	  * position.
	  */
         decl = &parse.FullToken.FullDeclaration;
         if( decl->Declaration.File == TGSI_FILE_INPUT ) {
            unsigned first, last, mask;
            unsigned attrib;

            first = decl->Range.First;
            last = decl->Range.Last;
            mask = decl->Declaration.UsageMask;

            for (attrib = first; attrib <= last; attrib++) {
	       emit_interp(c, 
			   attrib, 
			   decl->Semantic.Name,
			   decl->Declaration.Interpolate );
            }
         }
	 
         break;

      case TGSI_TOKEN_TYPE_IMMEDIATE:
	 /* Unlike VS programs we can probably manage fine encoding
	  * immediate values directly into the emitted EU
	  * instructions, as we probably only need to reference one
	  * float value per instruction.  Just save the data for now
	  * and use directly later.
	  */
	 i = c->nr_immediates++;
	 imm = &parse.FullToken.FullImmediate.u[i].Float;
	 size = parse.FullToken.FullImmediate.Immediate.NrTokens - 1;

	 if (c->nr_immediates >= BRW_WM_MAX_CONST)
	    return PIPE_ERROR_OUT_OF_MEMORY;

	 for (i = 0; i < size; i++)
	    c->immediate[c->nr_immediates].v[i] = imm[i];

	 for (; i < 4; i++)
	    c->immediate[c->nr_immediates].v[i] = 0.0;

	 c->immediate[c->nr_immediates].nr = size;
	 c->nr_immediates++;
	 break;

      case TGSI_TOKEN_TYPE_INSTRUCTION:
         inst = &parse.FullToken.FullInstruction;
	 emit_insn(c, inst);
	 break;
      }
   }

   if (BRW_DEBUG & DEBUG_WM) {
      brw_wm_print_fp_program( c, "pass_fp" );
      debug_printf("\n");
   }

   return c->error;
}