summaryrefslogtreecommitdiff
path: root/src/mesa/state_tracker/st_mesa_to_tgsi.c
blob: 537a6a864829843de97c452cec191fc85a64e36c (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
/**************************************************************************
 * 
 * Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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, sub license, 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS 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.
 * 
 **************************************************************************/

/*
 * \author
 * Michal Krol,
 * Keith Whitwell
 */

#include "pipe/p_compiler.h"
#include "pipe/p_shader_tokens.h"
#include "pipe/p_state.h"
#include "pipe/p_context.h"
#include "tgsi/tgsi_ureg.h"
#include "st_mesa_to_tgsi.h"
#include "st_context.h"
#include "shader/prog_instruction.h"
#include "shader/prog_parameter.h"
#include "util/u_debug.h"
#include "util/u_math.h"
#include "util/u_memory.h"

struct label {
   unsigned branch_target;
   unsigned token;
};


/**
 * Intermediate state used during shader translation.
 */
struct st_translate {
   struct ureg_program *ureg;

   struct ureg_dst temps[MAX_PROGRAM_TEMPS];
   struct ureg_src *constants;
   struct ureg_dst outputs[PIPE_MAX_SHADER_OUTPUTS];
   struct ureg_src inputs[PIPE_MAX_SHADER_INPUTS];
   struct ureg_dst address[1];
   struct ureg_src samplers[PIPE_MAX_SAMPLERS];
   struct ureg_dst psizregreal;
   struct ureg_src pointSizeConst;
   GLint psizoutindex;
   GLboolean prevInstWrotePsiz;

   const GLuint *inputMapping;
   const GLuint *outputMapping;

   /* For every instruction that contains a label (eg CALL), keep
    * details so that we can go back afterwards and emit the correct
    * tgsi instruction number for each label.
    */
   struct label *labels;
   unsigned labels_size;
   unsigned labels_count;

   /* Keep a record of the tgsi instruction number that each mesa
    * instruction starts at, will be used to fix up labels after
    * translation.
    */
   unsigned *insn;
   unsigned insn_size;
   unsigned insn_count;

   unsigned procType;  /**< TGSI_PROCESSOR_VERTEX/FRAGMENT */

   boolean error;
};


static unsigned *get_label( struct st_translate *t,
                            unsigned branch_target )
{
   unsigned i;

   if (t->labels_count + 1 >= t->labels_size) {
      unsigned old_size = t->labels_size;
      t->labels_size = 1 << (util_logbase2(t->labels_size) + 1);
      t->labels = REALLOC( t->labels, 
                           old_size * sizeof t->labels[0], 
                           t->labels_size * sizeof t->labels[0] );
      if (t->labels == NULL) {
         static unsigned dummy;
         t->error = TRUE;
         return &dummy;
      }
   }

   i = t->labels_count++;
   t->labels[i].branch_target = branch_target;
   return &t->labels[i].token;
}


static void set_insn_start( struct st_translate *t,
                            unsigned start )
{
   if (t->insn_count + 1 >= t->insn_size) {
      unsigned old_size = t->insn_size;
      t->insn_size = 1 << (util_logbase2(t->insn_size) + 1);
      t->insn = REALLOC( t->insn, 
                         old_size * sizeof t->insn[0], 
                         t->insn_size * sizeof t->insn[0] );
      if (t->insn == NULL) {
         t->error = TRUE;
         return;
      }
   }

   t->insn[t->insn_count++] = start;
}


/*
 * Map mesa register file to TGSI register file.
 */
static struct ureg_dst
dst_register( struct st_translate *t,
              gl_register_file file,
              GLuint index )
{
   switch( file ) {
   case PROGRAM_UNDEFINED:
      return ureg_dst_undef();

   case PROGRAM_TEMPORARY:
      if (ureg_dst_is_undef(t->temps[index]))
         t->temps[index] = ureg_DECL_temporary( t->ureg );

      return t->temps[index];

   case PROGRAM_OUTPUT:
      if (index == t->psizoutindex)
         t->prevInstWrotePsiz = GL_TRUE;
      return t->outputs[t->outputMapping[index]];

   case PROGRAM_ADDRESS:
      return t->address[index];

   default:
      debug_assert( 0 );
      return ureg_dst_undef();
   }
}


static struct ureg_src
src_register( struct st_translate *t,
              gl_register_file file,
              GLint index )
{
   switch( file ) {
   case PROGRAM_UNDEFINED:
      return ureg_src_undef();

   case PROGRAM_TEMPORARY:
      ASSERT(index >= 0);
      if (ureg_dst_is_undef(t->temps[index]))
         t->temps[index] = ureg_DECL_temporary( t->ureg );
      return ureg_src(t->temps[index]);

   case PROGRAM_NAMED_PARAM:
   case PROGRAM_ENV_PARAM:
   case PROGRAM_LOCAL_PARAM:
   case PROGRAM_UNIFORM:
      ASSERT(index >= 0);
      return t->constants[index];
   case PROGRAM_STATE_VAR:
   case PROGRAM_CONSTANT:       /* ie, immediate */
      if (index < 0)
         return ureg_DECL_constant( t->ureg, 0 );
      else
         return t->constants[index];

   case PROGRAM_INPUT:
      return t->inputs[t->inputMapping[index]];

   case PROGRAM_OUTPUT:
      return ureg_src(t->outputs[t->outputMapping[index]]); /* not needed? */

   case PROGRAM_ADDRESS:
      return ureg_src(t->address[index]);

   default:
      debug_assert( 0 );
      return ureg_src_undef();
   }
}


/**
 * Map mesa texture target to TGSI texture target.
 */
static unsigned
translate_texture_target( GLuint textarget,
                          GLboolean shadow )
{
   if (shadow) {
      switch( textarget ) {
      case TEXTURE_1D_INDEX:   return TGSI_TEXTURE_SHADOW1D;
      case TEXTURE_2D_INDEX:   return TGSI_TEXTURE_SHADOW2D;
      case TEXTURE_RECT_INDEX: return TGSI_TEXTURE_SHADOWRECT;
      default: break;
      }
   }

   switch( textarget ) {
   case TEXTURE_1D_INDEX:   return TGSI_TEXTURE_1D;
   case TEXTURE_2D_INDEX:   return TGSI_TEXTURE_2D;
   case TEXTURE_3D_INDEX:   return TGSI_TEXTURE_3D;
   case TEXTURE_CUBE_INDEX: return TGSI_TEXTURE_CUBE;
   case TEXTURE_RECT_INDEX: return TGSI_TEXTURE_RECT;
   default:
      debug_assert( 0 );
      return TGSI_TEXTURE_1D;
   }
}


static struct ureg_dst
translate_dst( struct st_translate *t,
               const struct prog_dst_register *DstReg,
               boolean saturate )
{
   struct ureg_dst dst = dst_register( t, 
                                       DstReg->File,
                                       DstReg->Index );

   dst = ureg_writemask( dst, 
                         DstReg->WriteMask );
   
   if (saturate)
      dst = ureg_saturate( dst );

   if (DstReg->RelAddr)
      dst = ureg_dst_indirect( dst, ureg_src(t->address[0]) );

   return dst;
}


static struct ureg_src
translate_src( struct st_translate *t,
               const struct prog_src_register *SrcReg )
{
   struct ureg_src src = src_register( t, SrcReg->File, SrcReg->Index );

   src = ureg_swizzle( src,
                       GET_SWZ( SrcReg->Swizzle, 0 ) & 0x3,
                       GET_SWZ( SrcReg->Swizzle, 1 ) & 0x3,
                       GET_SWZ( SrcReg->Swizzle, 2 ) & 0x3,
                       GET_SWZ( SrcReg->Swizzle, 3 ) & 0x3);

   if (SrcReg->Negate == NEGATE_XYZW)
      src = ureg_negate(src);

   if (SrcReg->Abs) 
      src = ureg_abs(src);

   if (SrcReg->RelAddr) {
      src = ureg_src_indirect( src, ureg_src(t->address[0]));
      /* If SrcReg->Index was negative, it was set to zero in
       * src_register().  Reassign it now.
       */
      src.Index = SrcReg->Index;
   }

   return src;
}


static struct ureg_src swizzle_4v( struct ureg_src src,
                                   const unsigned *swz )
{
   return ureg_swizzle( src, swz[0], swz[1], swz[2], swz[3] );
}


/**
 * Translate a SWZ instruction into a MOV, MUL or MAD instruction.  EG:
 *
 *   SWZ dst, src.x-y10 
 * 
 * becomes:
 *
 *   MAD dst {1,-1,0,0}, src.xyxx, {0,0,1,0}
 */
static void emit_swz( struct st_translate *t,
                      struct ureg_dst dst,
                      const struct prog_src_register *SrcReg )
{
   struct ureg_program *ureg = t->ureg;
   struct ureg_src src = src_register( t, SrcReg->File, SrcReg->Index );

   unsigned negate_mask =  SrcReg->Negate;

   unsigned one_mask = ((GET_SWZ(SrcReg->Swizzle, 0) == SWIZZLE_ONE) << 0 |
                        (GET_SWZ(SrcReg->Swizzle, 1) == SWIZZLE_ONE) << 1 |
                        (GET_SWZ(SrcReg->Swizzle, 2) == SWIZZLE_ONE) << 2 |
                        (GET_SWZ(SrcReg->Swizzle, 3) == SWIZZLE_ONE) << 3);

   unsigned zero_mask = ((GET_SWZ(SrcReg->Swizzle, 0) == SWIZZLE_ZERO) << 0 |
                         (GET_SWZ(SrcReg->Swizzle, 1) == SWIZZLE_ZERO) << 1 |
                         (GET_SWZ(SrcReg->Swizzle, 2) == SWIZZLE_ZERO) << 2 |
                         (GET_SWZ(SrcReg->Swizzle, 3) == SWIZZLE_ZERO) << 3);

   unsigned negative_one_mask = one_mask & negate_mask;
   unsigned positive_one_mask = one_mask & ~negate_mask;
   
   struct ureg_src imm;
   unsigned i;
   unsigned mul_swizzle[4] = {0,0,0,0};
   unsigned add_swizzle[4] = {0,0,0,0};
   unsigned src_swizzle[4] = {0,0,0,0};
   boolean need_add = FALSE;
   boolean need_mul = FALSE;

   if (dst.WriteMask == 0)
      return;

   /* Is this just a MOV?
    */
   if (zero_mask == 0 &&
       one_mask == 0 &&
       (negate_mask == 0 || negate_mask == TGSI_WRITEMASK_XYZW)) 
   {
      ureg_MOV( ureg, dst, translate_src( t, SrcReg ));
      return;
   }

#define IMM_ZERO    0
#define IMM_ONE     1
#define IMM_NEG_ONE 2

   imm = ureg_imm3f( ureg, 0, 1, -1 );

   for (i = 0; i < 4; i++) {
      unsigned bit = 1 << i;

      if (dst.WriteMask & bit) {
         if (positive_one_mask & bit) {
            mul_swizzle[i] = IMM_ZERO;
            add_swizzle[i] = IMM_ONE;
            need_add = TRUE;
         }
         else if (negative_one_mask & bit) {
            mul_swizzle[i] = IMM_ZERO;
            add_swizzle[i] = IMM_NEG_ONE;
            need_add = TRUE;
         }
         else if (zero_mask & bit) {
            mul_swizzle[i] = IMM_ZERO;
            add_swizzle[i] = IMM_ZERO;
            need_add = TRUE;
         }
         else {
            add_swizzle[i] = IMM_ZERO;
            src_swizzle[i] = GET_SWZ(SrcReg->Swizzle, i);
            need_mul = TRUE;
            if (negate_mask & bit) {
               mul_swizzle[i] = IMM_NEG_ONE;
            }
            else {
               mul_swizzle[i] = IMM_ONE;
            }
         }
      }
   }

   if (need_mul && need_add) {
      ureg_MAD( ureg, 
                dst,
                swizzle_4v( src, src_swizzle ),
                swizzle_4v( imm, mul_swizzle ),
                swizzle_4v( imm, add_swizzle ) );
   }
   else if (need_mul) {
      ureg_MUL( ureg, 
                dst,
                swizzle_4v( src, src_swizzle ),
                swizzle_4v( imm, mul_swizzle ) );
   }
   else if (need_add) {
      ureg_MOV( ureg, 
                dst,
                swizzle_4v( imm, add_swizzle ) );
   }
   else {
      debug_assert(0);
   }

#undef IMM_ZERO
#undef IMM_ONE
#undef IMM_NEG_ONE
}


/**
 * Negate the value of DDY to match GL semantics where (0,0) is the
 * lower-left corner of the window.
 * Note that the GL_ARB_fragment_coord_conventions extension will
 * effect this someday.
 */
static void emit_ddy( struct st_translate *t,
                      struct ureg_dst dst,
                      const struct prog_src_register *SrcReg )
{
   struct ureg_program *ureg = t->ureg;
   struct ureg_src src = translate_src( t, SrcReg );
   src = ureg_negate( src );
   ureg_DDY( ureg, dst, src );
}



static unsigned
translate_opcode( unsigned op )
{
   switch( op ) {
   case OPCODE_ARL:
      return TGSI_OPCODE_ARL;
   case OPCODE_ABS:
      return TGSI_OPCODE_ABS;
   case OPCODE_ADD:
      return TGSI_OPCODE_ADD;
   case OPCODE_BGNLOOP:
      return TGSI_OPCODE_BGNLOOP;
   case OPCODE_BGNSUB:
      return TGSI_OPCODE_BGNSUB;
   case OPCODE_BRA:
      return TGSI_OPCODE_BRA;
   case OPCODE_BRK:
      return TGSI_OPCODE_BRK;
   case OPCODE_CAL:
      return TGSI_OPCODE_CAL;
   case OPCODE_CMP:
      return TGSI_OPCODE_CMP;
   case OPCODE_CONT:
      return TGSI_OPCODE_CONT;
   case OPCODE_COS:
      return TGSI_OPCODE_COS;
   case OPCODE_DDX:
      return TGSI_OPCODE_DDX;
   case OPCODE_DDY:
      return TGSI_OPCODE_DDY;
   case OPCODE_DP2:
      return TGSI_OPCODE_DP2;
   case OPCODE_DP2A:
      return TGSI_OPCODE_DP2A;
   case OPCODE_DP3:
      return TGSI_OPCODE_DP3;
   case OPCODE_DP4:
      return TGSI_OPCODE_DP4;
   case OPCODE_DPH:
      return TGSI_OPCODE_DPH;
   case OPCODE_DST:
      return TGSI_OPCODE_DST;
   case OPCODE_ELSE:
      return TGSI_OPCODE_ELSE;
   case OPCODE_ENDIF:
      return TGSI_OPCODE_ENDIF;
   case OPCODE_ENDLOOP:
      return TGSI_OPCODE_ENDLOOP;
   case OPCODE_ENDSUB:
      return TGSI_OPCODE_ENDSUB;
   case OPCODE_EX2:
      return TGSI_OPCODE_EX2;
   case OPCODE_EXP:
      return TGSI_OPCODE_EXP;
   case OPCODE_FLR:
      return TGSI_OPCODE_FLR;
   case OPCODE_FRC:
      return TGSI_OPCODE_FRC;
   case OPCODE_IF:
      return TGSI_OPCODE_IF;
   case OPCODE_TRUNC:
      return TGSI_OPCODE_TRUNC;
   case OPCODE_KIL:
      return TGSI_OPCODE_KIL;
   case OPCODE_KIL_NV:
      return TGSI_OPCODE_KILP;
   case OPCODE_LG2:
      return TGSI_OPCODE_LG2;
   case OPCODE_LOG:
      return TGSI_OPCODE_LOG;
   case OPCODE_LIT:
      return TGSI_OPCODE_LIT;
   case OPCODE_LRP:
      return TGSI_OPCODE_LRP;
   case OPCODE_MAD:
      return TGSI_OPCODE_MAD;
   case OPCODE_MAX:
      return TGSI_OPCODE_MAX;
   case OPCODE_MIN:
      return TGSI_OPCODE_MIN;
   case OPCODE_MOV:
      return TGSI_OPCODE_MOV;
   case OPCODE_MUL:
      return TGSI_OPCODE_MUL;
   case OPCODE_NOP:
      return TGSI_OPCODE_NOP;
   case OPCODE_NRM3:
      return TGSI_OPCODE_NRM;
   case OPCODE_NRM4:
      return TGSI_OPCODE_NRM4;
   case OPCODE_POW:
      return TGSI_OPCODE_POW;
   case OPCODE_RCP:
      return TGSI_OPCODE_RCP;
   case OPCODE_RET:
      return TGSI_OPCODE_RET;
   case OPCODE_RSQ:
      return TGSI_OPCODE_RSQ;
   case OPCODE_SCS:
      return TGSI_OPCODE_SCS;
   case OPCODE_SEQ:
      return TGSI_OPCODE_SEQ;
   case OPCODE_SGE:
      return TGSI_OPCODE_SGE;
   case OPCODE_SGT:
      return TGSI_OPCODE_SGT;
   case OPCODE_SIN:
      return TGSI_OPCODE_SIN;
   case OPCODE_SLE:
      return TGSI_OPCODE_SLE;
   case OPCODE_SLT:
      return TGSI_OPCODE_SLT;
   case OPCODE_SNE:
      return TGSI_OPCODE_SNE;
   case OPCODE_SSG:
      return TGSI_OPCODE_SSG;
   case OPCODE_SUB:
      return TGSI_OPCODE_SUB;
   case OPCODE_TEX:
      return TGSI_OPCODE_TEX;
   case OPCODE_TXB:
      return TGSI_OPCODE_TXB;
   case OPCODE_TXD:
      return TGSI_OPCODE_TXD;
   case OPCODE_TXL:
      return TGSI_OPCODE_TXL;
   case OPCODE_TXP:
      return TGSI_OPCODE_TXP;
   case OPCODE_XPD:
      return TGSI_OPCODE_XPD;
   case OPCODE_END:
      return TGSI_OPCODE_END;
   default:
      debug_assert( 0 );
      return TGSI_OPCODE_NOP;
   }
}


static void
compile_instruction(
   struct st_translate *t,
   const struct prog_instruction *inst )
{
   struct ureg_program *ureg = t->ureg;
   GLuint i;
   struct ureg_dst dst[1];
   struct ureg_src src[4];
   unsigned num_dst;
   unsigned num_src;

   num_dst = _mesa_num_inst_dst_regs( inst->Opcode );
   num_src = _mesa_num_inst_src_regs( inst->Opcode );

   if (num_dst) 
      dst[0] = translate_dst( t, 
                              &inst->DstReg,
                              inst->SaturateMode );

   for (i = 0; i < num_src; i++) 
      src[i] = translate_src( t, &inst->SrcReg[i] );

   switch( inst->Opcode ) {
   case OPCODE_SWZ:
      emit_swz( t, dst[0], &inst->SrcReg[0] );
      return;

   case OPCODE_BGNLOOP:
   case OPCODE_CAL:
   case OPCODE_ELSE:
   case OPCODE_ENDLOOP:
   case OPCODE_IF:
      debug_assert(num_dst == 0);
      ureg_label_insn( ureg,
                       translate_opcode( inst->Opcode ),
                       src, num_src,
                       get_label( t, inst->BranchTarget ));
      return;

   case OPCODE_TEX:
   case OPCODE_TXB:
   case OPCODE_TXD:
   case OPCODE_TXL:
   case OPCODE_TXP:
      src[num_src++] = t->samplers[inst->TexSrcUnit];
      ureg_tex_insn( ureg,
                     translate_opcode( inst->Opcode ),
                     dst, num_dst, 
                     translate_texture_target( inst->TexSrcTarget,
                                               inst->TexShadow ),
                     src, num_src );
      return;

   case OPCODE_SCS:
      dst[0] = ureg_writemask(dst[0], TGSI_WRITEMASK_XY );
      ureg_insn( ureg, 
                 translate_opcode( inst->Opcode ), 
                 dst, num_dst, 
                 src, num_src );
      break;

   case OPCODE_XPD:
      dst[0] = ureg_writemask(dst[0], TGSI_WRITEMASK_XYZ );
      ureg_insn( ureg, 
                 translate_opcode( inst->Opcode ), 
                 dst, num_dst, 
                 src, num_src );
      break;

   case OPCODE_NOISE1:
   case OPCODE_NOISE2:
   case OPCODE_NOISE3:
   case OPCODE_NOISE4:
      /* At some point, a motivated person could add a better
       * implementation of noise.  Currently not even the nvidia
       * binary drivers do anything more than this.  In any case, the
       * place to do this is in the GL state tracker, not the poor
       * driver.
       */
      ureg_MOV( ureg, dst[0], ureg_imm1f(ureg, 0.5) );
      break;
		 
   case OPCODE_DDY:
      emit_ddy( t, dst[0], &inst->SrcReg[0] );
      break;

   default:
      ureg_insn( ureg, 
                 translate_opcode( inst->Opcode ), 
                 dst, num_dst, 
                 src, num_src );
      break;
   }
}

/**
 * Emit the TGSI instructions to adjust the WPOS pixel center convention
 */
static void
emit_adjusted_wpos( struct st_translate *t,
                    const struct gl_program *program, GLfloat value)
{
   struct ureg_program *ureg = t->ureg;
   struct ureg_dst wpos_temp = ureg_DECL_temporary(ureg);
   struct ureg_src wpos_input = t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]];

   ureg_ADD(ureg, ureg_writemask(wpos_temp, TGSI_WRITEMASK_X | TGSI_WRITEMASK_Y),
		   wpos_input, ureg_imm1f(ureg, value));

   t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]] = ureg_src(wpos_temp);
}

/**
 * Emit the TGSI instructions for inverting the WPOS y coordinate.
 */
static void
emit_inverted_wpos( struct st_translate *t,
                    const struct gl_program *program )
{
   struct ureg_program *ureg = t->ureg;

   /* Fragment program uses fragment position input.
    * Need to replace instances of INPUT[WPOS] with temp T
    * where T = INPUT[WPOS] by y is inverted.
    */
   static const gl_state_index winSizeState[STATE_LENGTH]
      = { STATE_INTERNAL, STATE_FB_SIZE, 0, 0, 0 };
   
   /* XXX: note we are modifying the incoming shader here!  Need to
    * do this before emitting the constant decls below, or this
    * will be missed:
    */
   unsigned winHeightConst = _mesa_add_state_reference(program->Parameters,
                                                       winSizeState);

   struct ureg_src winsize = ureg_DECL_constant( ureg, winHeightConst );
   struct ureg_dst wpos_temp;
   struct ureg_src wpos_input = t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]];

   /* MOV wpos_temp, input[wpos]
    */
   if (wpos_input.File == TGSI_FILE_TEMPORARY)
      wpos_temp = ureg_dst(wpos_input);
   else {
      wpos_temp = ureg_DECL_temporary( ureg );
      ureg_MOV( ureg, wpos_temp, wpos_input );
   }

   /* SUB wpos_temp.y, winsize_const, wpos_input
    */
   ureg_SUB( ureg,
             ureg_writemask(wpos_temp, TGSI_WRITEMASK_Y ),
             winsize,
             wpos_input);

   /* Use wpos_temp as position input from here on:
    */
   t->inputs[t->inputMapping[FRAG_ATTRIB_WPOS]] = ureg_src(wpos_temp);
}


/**
 * OpenGL's fragment gl_FrontFace input is 1 for front-facing, 0 for back.
 * TGSI uses +1 for front, -1 for back.
 * This function converts the TGSI value to the GL value.  Simply clamping/
 * saturating the value to [0,1] does the job.
 */
static void
emit_face_var( struct st_translate *t,
               const struct gl_program *program )
{
   struct ureg_program *ureg = t->ureg;
   struct ureg_dst face_temp = ureg_DECL_temporary( ureg );
   struct ureg_src face_input = t->inputs[t->inputMapping[FRAG_ATTRIB_FACE]];

   /* MOV_SAT face_temp, input[face]
    */
   face_temp = ureg_saturate( face_temp );
   ureg_MOV( ureg, face_temp, face_input );

   /* Use face_temp as face input from here on:
    */
   t->inputs[t->inputMapping[FRAG_ATTRIB_FACE]] = ureg_src(face_temp);
}


static void
emit_edgeflags( struct st_translate *t,
                 const struct gl_program *program )
{
   struct ureg_program *ureg = t->ureg;
   struct ureg_dst edge_dst = t->outputs[t->outputMapping[VERT_RESULT_EDGE]];
   struct ureg_src edge_src = t->inputs[t->inputMapping[VERT_ATTRIB_EDGEFLAG]];

   ureg_MOV( ureg, edge_dst, edge_src );
}


/**
 * Translate Mesa program to TGSI format.
 * \param program  the program to translate
 * \param numInputs  number of input registers used
 * \param inputMapping  maps Mesa fragment program inputs to TGSI generic
 *                      input indexes
 * \param inputSemanticName  the TGSI_SEMANTIC flag for each input
 * \param inputSemanticIndex  the semantic index (ex: which texcoord) for
 *                            each input
 * \param interpMode  the TGSI_INTERPOLATE_LINEAR/PERSP mode for each input
 * \param numOutputs  number of output registers used
 * \param outputMapping  maps Mesa fragment program outputs to TGSI
 *                       generic outputs
 * \param outputSemanticName  the TGSI_SEMANTIC flag for each output
 * \param outputSemanticIndex  the semantic index (ex: which texcoord) for
 *                             each output
 *
 * \return  PIPE_OK or PIPE_ERROR_OUT_OF_MEMORY
 */
enum pipe_error
st_translate_mesa_program(
   GLcontext *ctx,
   uint procType,
   struct ureg_program *ureg,
   const struct gl_program *program,
   GLuint numInputs,
   const GLuint inputMapping[],
   const ubyte inputSemanticName[],
   const ubyte inputSemanticIndex[],
   const GLuint interpMode[],
   GLuint numOutputs,
   const GLuint outputMapping[],
   const ubyte outputSemanticName[],
   const ubyte outputSemanticIndex[],
   boolean passthrough_edgeflags )
{
   struct st_translate translate, *t;
   unsigned i;
   enum pipe_error ret = PIPE_OK;

   t = &translate;
   memset(t, 0, sizeof *t);

   t->procType = procType;
   t->inputMapping = inputMapping;
   t->outputMapping = outputMapping;
   t->ureg = ureg;
   t->psizoutindex = -1;
   t->prevInstWrotePsiz = GL_FALSE;

   /*_mesa_print_program(program);*/

   /*
    * Declare input attributes.
    */
   if (procType == TGSI_PROCESSOR_FRAGMENT) {
      struct gl_fragment_program* fp = (struct gl_fragment_program*)program;
      for (i = 0; i < numInputs; i++) {
         if (program->InputFlags[0] & PROG_PARAM_BIT_CYL_WRAP) {
            t->inputs[i] = ureg_DECL_fs_input_cyl(ureg,
                                                  inputSemanticName[i],
                                                  inputSemanticIndex[i],
                                                  interpMode[i],
                                                  TGSI_CYLINDRICAL_WRAP_X);
         }
         else {
            t->inputs[i] = ureg_DECL_fs_input(ureg,
                                              inputSemanticName[i],
                                              inputSemanticIndex[i],
                                              interpMode[i]);
         }
      }

      if (program->InputsRead & FRAG_BIT_WPOS) {
         /* Must do this after setting up t->inputs, and before
          * emitting constant references, below:
          */
         struct pipe_screen* pscreen = st_context(ctx)->pipe->screen;
         boolean invert = FALSE;

         if (fp->OriginUpperLeft) {
            if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT)) {
            }
            else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT)) {
               ureg_property_fs_coord_origin(ureg, TGSI_FS_COORD_ORIGIN_LOWER_LEFT);
               invert = TRUE;
            }
            else
               assert(0);
         }
         else {
            if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT))
               ureg_property_fs_coord_origin(ureg, TGSI_FS_COORD_ORIGIN_LOWER_LEFT);
            else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT))
               invert = TRUE;
            else
               assert(0);
         }

         if (fp->PixelCenterInteger) {
            if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER))
               ureg_property_fs_coord_pixel_center(ureg, TGSI_FS_COORD_PIXEL_CENTER_INTEGER);
            else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER))
               emit_adjusted_wpos(t, program, invert ? 0.5f : -0.5f);
            else
               assert(0);
         }
         else {
            if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER)) {
            }
            else if (pscreen->get_param(pscreen, PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER)) {
               ureg_property_fs_coord_pixel_center(ureg, TGSI_FS_COORD_PIXEL_CENTER_INTEGER);
               emit_adjusted_wpos(t, program, invert ? -0.5f : 0.5f);
            }
            else
               assert(0);
         }

         /* we invert after adjustment so that we avoid the MOV to temporary,
          * and reuse the adjustment ADD instead */
         if (invert)
            emit_inverted_wpos(t, program);
      }

      if (program->InputsRead & FRAG_BIT_FACE) {
         emit_face_var( t, program );
      }

      /*
       * Declare output attributes.
       */
      for (i = 0; i < numOutputs; i++) {
         switch (outputSemanticName[i]) {
         case TGSI_SEMANTIC_POSITION:
            t->outputs[i] = ureg_DECL_output( ureg,
                                              TGSI_SEMANTIC_POSITION, /* Z / Depth */
                                              outputSemanticIndex[i] );

            t->outputs[i] = ureg_writemask( t->outputs[i],
                                            TGSI_WRITEMASK_Z );
            break;
         case TGSI_SEMANTIC_COLOR:
            t->outputs[i] = ureg_DECL_output( ureg,
                                              TGSI_SEMANTIC_COLOR,
                                              outputSemanticIndex[i] );
            break;
         default:
            debug_assert(0);
            return 0;
         }
      }
   }
   else {
      for (i = 0; i < numInputs; i++) {
         t->inputs[i] = ureg_DECL_vs_input(ureg, i);
      }

      for (i = 0; i < numOutputs; i++) {
         t->outputs[i] = ureg_DECL_output( ureg,
                                           outputSemanticName[i],
                                           outputSemanticIndex[i] );
         if ((outputSemanticName[i] == TGSI_SEMANTIC_PSIZE) && program->Id) {
            static const gl_state_index pointSizeClampState[STATE_LENGTH]
               = { STATE_INTERNAL, STATE_POINT_SIZE_IMPL_CLAMP, 0, 0, 0 };
               /* XXX: note we are modifying the incoming shader here!  Need to
               * do this before emitting the constant decls below, or this
               * will be missed:
               */
            unsigned pointSizeClampConst = _mesa_add_state_reference(program->Parameters,
                                                                     pointSizeClampState);
            struct ureg_dst psizregtemp = ureg_DECL_temporary( ureg );
            t->pointSizeConst = ureg_DECL_constant( ureg, pointSizeClampConst );
            t->psizregreal = t->outputs[i];
            t->psizoutindex = i;
            t->outputs[i] = psizregtemp;
         }
      }
      if (passthrough_edgeflags)
         emit_edgeflags( t, program );
   }

   /* Declare address register.
    */
   if (program->NumAddressRegs > 0) {
      debug_assert( program->NumAddressRegs == 1 );
      t->address[0] = ureg_DECL_address( ureg );
   }


   /* Emit constants and immediates.  Mesa uses a single index space
    * for these, so we put all the translated regs in t->constants.
    */
   if (program->Parameters) {
      
      t->constants = CALLOC( program->Parameters->NumParameters,
                             sizeof t->constants[0] );
      if (t->constants == NULL) {
         ret = PIPE_ERROR_OUT_OF_MEMORY;
         goto out;
      }
      
      for (i = 0; i < program->Parameters->NumParameters; i++) {
         switch (program->Parameters->Parameters[i].Type) {
         case PROGRAM_ENV_PARAM:
         case PROGRAM_LOCAL_PARAM:
         case PROGRAM_STATE_VAR:
         case PROGRAM_NAMED_PARAM:
         case PROGRAM_UNIFORM:
            t->constants[i] = ureg_DECL_constant( ureg, i );
            break;

            /* Emit immediates only when there is no address register
             * in use.  FIXME: Be smarter and recognize param arrays:
             * indirect addressing is only valid within the referenced
             * array.
             */
         case PROGRAM_CONSTANT:
            if (program->NumAddressRegs > 0) 
               t->constants[i] = ureg_DECL_constant( ureg, i );
            else
               t->constants[i] = 
                  ureg_DECL_immediate( ureg,
                                       program->Parameters->ParameterValues[i],
                                       4 );
            break;
         default:
            break;
         }
      }
   }

   /* texture samplers */
   for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
      if (program->SamplersUsed & (1 << i)) {
         t->samplers[i] = ureg_DECL_sampler( ureg, i );
      }
   }

   /* Emit each instruction in turn:
    */
   for (i = 0; i < program->NumInstructions; i++) {
      set_insn_start( t, ureg_get_instruction_number( ureg ));
      compile_instruction( t, &program->Instructions[i] );

      /* note can't do that easily at the end of prog due to
         possible early return */
      if (t->prevInstWrotePsiz && program->Id) {
         set_insn_start( t, ureg_get_instruction_number( ureg ));
         ureg_MAX( t->ureg, ureg_writemask(t->outputs[t->psizoutindex], WRITEMASK_X),
                   ureg_src(t->outputs[t->psizoutindex]),
                   ureg_swizzle(t->pointSizeConst, 1,1,1,1));
         ureg_MIN( t->ureg, ureg_writemask(t->psizregreal, WRITEMASK_X),
                   ureg_src(t->outputs[t->psizoutindex]),
                   ureg_swizzle(t->pointSizeConst, 2,2,2,2));
      }
      t->prevInstWrotePsiz = GL_FALSE;
   }

   /* Fix up all emitted labels:
    */
   for (i = 0; i < t->labels_count; i++) {
      ureg_fixup_label( ureg,
                        t->labels[i].token,
                        t->insn[t->labels[i].branch_target] );
   }

out:
   FREE(t->insn);
   FREE(t->labels);
   FREE(t->constants);

   if (t->error) {
      debug_printf("%s: translate error flag set\n", __FUNCTION__);
   }

   return ret;
}


/**
 * Tokens cannot be free with _mesa_free otherwise the builtin gallium
 * malloc debugging will get confused.
 */
void
st_free_tokens(const struct tgsi_token *tokens)
{
   FREE((void *)tokens);
}