summaryrefslogtreecommitdiffstats
path: root/src/mesa/tnl/t_vp_build.c
blob: 9034fc77121e355ce28b9d9d00574f1a86e1eac0 (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
/*
 * Mesa 3-D graphics library
 * Version:  6.3
 *
 * Copyright (C) 2005  Tungsten Graphics   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
 * TUNGSTEN GRAPHICS 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.
 */

/**
 * \file t_vp_build.c
 * Create a vertex program to execute the current fixed function T&L pipeline.
 * \author Keith Whitwell
 */


#include <strings.h>

#include "glheader.h"
#include "macros.h"
#include "enums.h"
#include "t_context.h"
#include "t_vp_build.h"

#include "shader/program.h"
#include "shader/nvvertprog.h"
#include "shader/arbvertparse.h"


/* Very useful debugging tool - produces annotated listing of
 * generated program with line/function references for each
 * instruction back into this file:
 */
#define DISASSEM 0

/* Use uregs to represent registers internally, translate to Mesa's
 * expected formats on emit.  
 *
 * NOTE: These are passed by value extensively in this file rather
 * than as usual by pointer reference.  If this disturbs you, try
 * remembering they are just 32bits in size.
 *
 * GCC is smart enough to deal with these dword-sized structures in
 * much the same way as if I had defined them as dwords and was using
 * macros to access and set the fields.  This is much nicer and easier
 * to evolve.
 */
struct ureg {
   GLuint file:4;
   GLuint idx:8;
   GLuint negate:1;
   GLuint swz:12;
   GLuint pad:7;
};


struct tnl_program {
   GLcontext *ctx;
   struct vertex_program *program;
   
   GLuint temp_flag;
   GLuint temp_reserved;
   
   struct ureg eye_position;
   struct ureg eye_position_normalized;
   struct ureg eye_normal;
   struct ureg identity;

   GLuint materials;
   GLuint color_materials;
};


const static struct ureg undef = { 
   ~0,
   ~0,
   0,
   0,
   0
};

/* Local shorthand:
 */
#define X    SWIZZLE_X
#define Y    SWIZZLE_Y
#define Z    SWIZZLE_Z
#define W    SWIZZLE_W


/* Construct a ureg:
 */
static struct ureg make_ureg(GLuint file, GLuint idx)
{
   struct ureg reg;
   reg.file = file;
   reg.idx = idx;
   reg.negate = 0;
   reg.swz = SWIZZLE_NOOP;
   reg.pad = 0;
   return reg;
}



static struct ureg negate( struct ureg reg )
{
   reg.negate ^= 1;
   return reg;
} 


static struct ureg swizzle( struct ureg reg, int x, int y, int z, int w )
{
   reg.swz = MAKE_SWIZZLE4(GET_SWZ(reg.swz, x),
			   GET_SWZ(reg.swz, y),
			   GET_SWZ(reg.swz, z),
			   GET_SWZ(reg.swz, w));

   return reg;
}

static struct ureg swizzle1( struct ureg reg, int x )
{
   return swizzle(reg, x, x, x, x);
}

static struct ureg get_temp( struct tnl_program *p )
{
   int bit = ffs( ~p->temp_flag );
   if (!bit) {
      fprintf(stderr, "%s: out of temporaries\n", __FILE__);
      exit(1);
   }

   p->temp_flag |= 1<<(bit-1);
   return make_ureg(PROGRAM_TEMPORARY, bit-1);
}

static struct ureg reserve_temp( struct tnl_program *p )
{
   struct ureg temp = get_temp( p );
   p->temp_reserved |= 1<<temp.idx;
   return temp;
}

static void release_temp( struct tnl_program *p, struct ureg reg )
{
   if (reg.file == PROGRAM_TEMPORARY) {
      p->temp_flag &= ~(1<<reg.idx);
      p->temp_flag |= p->temp_reserved; /* can't release reserved temps */
   }
}

static void release_temps( struct tnl_program *p )
{
   p->temp_flag = p->temp_reserved;
}



static struct ureg register_input( struct tnl_program *p, GLuint input )
{
   p->program->InputsRead |= (1<<input);
   return make_ureg(PROGRAM_INPUT, input);
}

static struct ureg register_output( struct tnl_program *p, GLuint output )
{
   p->program->OutputsWritten |= (1<<output);
   return make_ureg(PROGRAM_OUTPUT, output);
}

static struct ureg register_const4f( struct tnl_program *p, 
			      GLfloat s0,
			      GLfloat s1,
			      GLfloat s2,
			      GLfloat s3)
{
   GLfloat values[4];
   GLuint idx;
   values[0] = s0;
   values[1] = s1;
   values[2] = s2;
   values[3] = s3;
   idx = _mesa_add_unnamed_constant( p->program->Parameters, values );
   return make_ureg(PROGRAM_STATE_VAR, idx);
}

#define register_const1f(p, s0)         register_const4f(p, s0, 0, 0, 1)
#define register_const2f(p, s0, s1)     register_const4f(p, s0, s1, 0, 1)
#define register_const3f(p, s0, s1, s2) register_const4f(p, s0, s1, s2, 1)

static GLboolean is_undef( struct ureg reg )
{
   return reg.file == 0xf;
}

static struct ureg get_identity_param( struct tnl_program *p )
{
   if (is_undef(p->identity)) 
      p->identity = register_const4f(p, 0,0,0,1);

   return p->identity;
}

static struct ureg register_param6( struct tnl_program *p, 
				   GLint s0,
				   GLint s1,
				   GLint s2,
				   GLint s3,
				   GLint s4,
				   GLint s5)
{
   GLint tokens[6];
   GLuint idx;
   tokens[0] = s0;
   tokens[1] = s1;
   tokens[2] = s2;
   tokens[3] = s3;
   tokens[4] = s4;
   tokens[5] = s5;
   idx = _mesa_add_state_reference( p->program->Parameters, tokens );
   return make_ureg(PROGRAM_STATE_VAR, idx);
}


#define register_param1(p,s0)          register_param6(p,s0,0,0,0,0,0)
#define register_param2(p,s0,s1)       register_param6(p,s0,s1,0,0,0,0)
#define register_param3(p,s0,s1,s2)    register_param6(p,s0,s1,s2,0,0,0)
#define register_param4(p,s0,s1,s2,s3) register_param6(p,s0,s1,s2,s3,0,0)


static void register_matrix_param6( struct tnl_program *p,
				    GLint s0,
				    GLint s1,
				    GLint s2,
				    GLint s3,
				    GLint s4,
				    GLint s5,
				    struct ureg *matrix )
{
   GLuint i;

   /* This is a bit sad as the support is there to pull the whole
    * matrix out in one go:
    */
   for (i = 0; i <= s4 - s3; i++) 
      matrix[i] = register_param6( p, s0, s1, s2, i, i, s5 );
}


static void emit_arg( struct vp_src_register *src,
		      struct ureg reg )
{
   src->File = reg.file;
   src->Index = reg.idx;
   src->Swizzle = reg.swz;
   src->Negate = reg.negate;
   src->RelAddr = 0;
   src->pad = 0;
}

static void emit_dst( struct vp_dst_register *dst,
		      struct ureg reg, GLuint mask )
{
   dst->File = reg.file;
   dst->Index = reg.idx;
   /* allow zero as a shorthand for xyzw */
   dst->WriteMask = mask ? mask : WRITEMASK_XYZW; 
   dst->pad = 0;
}

static void debug_insn( struct vp_instruction *inst, const char *fn,
			GLuint line )
{
#if DISASSEM
   static const char *last_fn;
   
   if (fn != last_fn) {
      last_fn = fn;
      _mesa_printf("%s:\n", fn);
   }
	 
   _mesa_printf("%d:\t", line);
   _mesa_debug_vp_inst(1, inst);
#endif
}


static void emit_op3fn(struct tnl_program *p,
		       GLuint op,
		       struct ureg dest,
		       GLuint mask,
		       struct ureg src0,
		       struct ureg src1,
		       struct ureg src2,
		       const char *fn,
		       GLuint line)
{
   GLuint nr = p->program->Base.NumInstructions++;
   struct vp_instruction *inst = &p->program->Instructions[nr];
      
   inst->Opcode = op; 
   
   emit_arg( &inst->SrcReg[0], src0 );
   emit_arg( &inst->SrcReg[1], src1 );
   emit_arg( &inst->SrcReg[2], src2 );   

   emit_dst( &inst->DstReg, dest, mask );

   debug_insn(inst, fn, line);
}

   

#define emit_op3(p, op, dst, mask, src0, src1, src2) \
   emit_op3fn(p, op, dst, mask, src0, src1, src2, __FUNCTION__, __LINE__)

#define emit_op2(p, op, dst, mask, src0, src1) \
    emit_op3fn(p, op, dst, mask, src0, src1, undef, __FUNCTION__, __LINE__)

#define emit_op1(p, op, dst, mask, src0) \
    emit_op3fn(p, op, dst, mask, src0, undef, undef, __FUNCTION__, __LINE__)


static struct ureg make_temp( struct tnl_program *p, struct ureg reg )
{
   if (reg.file == PROGRAM_TEMPORARY && 
       !(p->temp_reserved & (1<<reg.idx)))
      return reg;
   else {
      struct ureg temp = get_temp(p);
      emit_op1(p, VP_OPCODE_MOV, temp, 0, reg);
      return temp;
   }
}


/* Currently no tracking performed of input/output/register size or
 * active elements.  Could be used to reduce these operations, as
 * could the matrix type.
 */
static void emit_matrix_transform_vec4( struct tnl_program *p,
					struct ureg dest,
					const struct ureg *mat,
					struct ureg src)
{
   emit_op2(p, VP_OPCODE_DP4, dest, WRITEMASK_X, src, mat[0]);
   emit_op2(p, VP_OPCODE_DP4, dest, WRITEMASK_Y, src, mat[1]);
   emit_op2(p, VP_OPCODE_DP4, dest, WRITEMASK_Z, src, mat[2]);
   emit_op2(p, VP_OPCODE_DP4, dest, WRITEMASK_W, src, mat[3]);
}

/* This version is much easier to implement if writemasks are not
 * supported natively on the target or (like SSE), the target doesn't
 * have a clean/obvious dotproduct implementation.
 */
static void emit_transpose_matrix_transform_vec4( struct tnl_program *p,
						  struct ureg dest,
						  const struct ureg *mat,
						  struct ureg src)
{
   struct ureg tmp;

   if (dest.file != PROGRAM_TEMPORARY)
      tmp = get_temp(p);
   else
      tmp = dest;

   emit_op2(p, VP_OPCODE_MUL, tmp, 0, swizzle1(src,X), mat[0]);
   emit_op3(p, VP_OPCODE_MAD, tmp, 0, swizzle1(src,Y), mat[1], tmp);
   emit_op3(p, VP_OPCODE_MAD, tmp, 0, swizzle1(src,Z), mat[2], tmp);
   emit_op3(p, VP_OPCODE_MAD, dest, 0, swizzle1(src,W), mat[3], tmp);

   if (dest.file != PROGRAM_TEMPORARY)
      release_temp(p, tmp);
}

static void emit_matrix_transform_vec3( struct tnl_program *p,
					struct ureg dest,
					const struct ureg *mat,
					struct ureg src)
{
   emit_op2(p, VP_OPCODE_DP3, dest, WRITEMASK_X, src, mat[0]);
   emit_op2(p, VP_OPCODE_DP3, dest, WRITEMASK_Y, src, mat[1]);
   emit_op2(p, VP_OPCODE_DP3, dest, WRITEMASK_Z, src, mat[2]);
}


static void emit_normalize_vec3( struct tnl_program *p,
				 struct ureg dest,
				 struct ureg src )
{
   struct ureg tmp = get_temp(p);
   emit_op2(p, VP_OPCODE_DP3, tmp, 0, src, src);
   emit_op1(p, VP_OPCODE_RSQ, tmp, 0, tmp);
   emit_op2(p, VP_OPCODE_MUL, dest, 0, src, tmp);
   release_temp(p, tmp);
}

static struct ureg get_eye_position( struct tnl_program *p )
{
   if (is_undef(p->eye_position)) {
      struct ureg pos = register_input( p, VERT_ATTRIB_POS ); 
      struct ureg modelview[4];

      register_matrix_param6( p, STATE_MATRIX, STATE_MODELVIEW, 0, 0, 3, 
			      STATE_MATRIX_TRANSPOSE, modelview );
      p->eye_position = reserve_temp(p);

      emit_transpose_matrix_transform_vec4(p, p->eye_position, modelview, pos);
   }
   
   return p->eye_position;
}


static struct ureg get_eye_position_normalized( struct tnl_program *p )
{
   if (is_undef(p->eye_position_normalized)) {
      struct ureg eye = get_eye_position(p);
      p->eye_position_normalized = reserve_temp(p);
      emit_normalize_vec3(p, p->eye_position_normalized, eye);
   }
   
   return p->eye_position_normalized;
}


static struct ureg get_eye_normal( struct tnl_program *p )
{
   if (is_undef(p->eye_normal)) {
      struct ureg normal = register_input(p, VERT_ATTRIB_NORMAL );
      struct ureg mvinv[3];

      register_matrix_param6( p, STATE_MATRIX, STATE_MODELVIEW, 0, 0, 2,
			      STATE_MATRIX_INVTRANS, mvinv );

      p->eye_normal = reserve_temp(p);

      /* Transform to eye space:
       */
      emit_matrix_transform_vec3( p, p->eye_normal, mvinv, normal );

      /* Normalize/Rescale:
       */
      if (p->ctx->Transform.Normalize) {
	 emit_normalize_vec3( p, p->eye_normal, p->eye_normal );
      }
      else if (p->ctx->Transform.RescaleNormals) {
	 struct ureg rescale = register_param2(p, STATE_INTERNAL,
					       STATE_NORMAL_SCALE);

	 emit_op2( p, VP_OPCODE_MUL, p->eye_normal, 0, normal, 
		   swizzle1(rescale, X));
      }
   }

   return p->eye_normal;
}



static void build_hpos( struct tnl_program *p )
{
   struct ureg pos = register_input( p, VERT_ATTRIB_POS ); 
   struct ureg hpos = register_output( p, VERT_RESULT_HPOS );
   struct ureg mvp[4];

   register_matrix_param6( p, STATE_MATRIX, STATE_MVP, 0, 0, 3, 
			   STATE_MATRIX_TRANSPOSE, mvp );
   emit_transpose_matrix_transform_vec4( p, hpos, mvp, pos );
}


static GLuint material_attrib( GLuint side, GLuint property )
{
   return (_TNL_ATTRIB_MAT_FRONT_AMBIENT + 
	   (property - STATE_AMBIENT) * 2 + 
	   side);
}

static void set_material_flags( struct tnl_program *p )
{
   GLcontext *ctx = p->ctx;
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   GLuint i;

   p->color_materials = 0;
   p->materials = 0;

   if (ctx->Light.ColorMaterialEnabled) {
      p->materials = 
	 p->color_materials = 
	 ctx->Light.ColorMaterialBitmask << _TNL_ATTRIB_MAT_FRONT_AMBIENT;
   }

   for (i = _TNL_ATTRIB_MAT_FRONT_AMBIENT ; i < _TNL_ATTRIB_INDEX ; i++) 
      if (tnl->vb.AttribPtr[i]->stride) 
	 p->materials |= 1<<i;
}


static struct ureg get_material( struct tnl_program *p, GLuint side, 
				 GLuint property )
{
   GLuint attrib = material_attrib(side, property);

   if (p->color_materials & (1<<attrib))
      return register_input(p, VERT_ATTRIB_COLOR0);
   else if (p->materials & (1<<attrib)) 
      return register_input( p, attrib );
   else
      return register_param3( p, STATE_MATERIAL, side, property );
}

#define SCENE_COLOR_BITS(side) (( _TNL_BIT_MAT_FRONT_EMISSION | \
				   _TNL_BIT_MAT_FRONT_AMBIENT | \
				   _TNL_BIT_MAT_FRONT_DIFFUSE) << (side))

/* Either return a precalculated constant value or emit code to
 * calculate these values dynamically in the case where material calls
 * are present between begin/end pairs.
 *
 * Probably want to shift this to the program compilation phase - if
 * we always emitted the calculation here, a smart compiler could
 * detect that it was constant (given a certain set of inputs), and
 * lift it out of the main loop.  That way the programs created here
 * would be independent of the vertex_buffer details.
 */
static struct ureg get_scenecolor( struct tnl_program *p, GLuint side )
{
   if (p->materials & SCENE_COLOR_BITS(side)) {
      struct ureg lm_ambient = register_param1(p, STATE_LIGHTMODEL_AMBIENT);
      struct ureg material_emission = get_material(p, side, STATE_EMISSION);
      struct ureg material_ambient = get_material(p, side, STATE_AMBIENT);
      struct ureg material_diffuse = get_material(p, side, STATE_DIFFUSE);
      struct ureg tmp = make_temp(p, material_diffuse);
      emit_op3(p, VP_OPCODE_MAD, tmp,  WRITEMASK_XYZ, lm_ambient, 
	       material_ambient, material_emission);
      return tmp;
   }
   else
      return register_param2( p, STATE_LIGHTMODEL_SCENECOLOR, side );
}


static struct ureg get_lightprod( struct tnl_program *p, GLuint light, 
				  GLuint side, GLuint property )
{
   GLuint attrib = material_attrib(side, property);
   if (p->materials & (1<<attrib)) {
      struct ureg light_value = 
	 register_param3(p, STATE_LIGHT, light, property);
      struct ureg material_value = get_material(p, side, property);
      struct ureg tmp = get_temp(p);
      emit_op2(p, VP_OPCODE_MUL, tmp,  0, light_value, material_value);
      return tmp;
   }
   else
      return register_param4(p, STATE_LIGHTPROD, light, side, property);
}

static struct ureg calculate_light_attenuation( struct tnl_program *p,
						GLuint i, 
						struct gl_light *light,
						struct ureg VPpli,
						struct ureg dist )
{
   struct ureg attenuation = register_param3(p, STATE_LIGHT, i,
					     STATE_ATTENUATION);
   struct ureg att = get_temp(p);

   /* Calculate spot attenuation:
    */
   if (light->SpotCutoff != 180.0F) {
      struct ureg spot_dir = register_param3(p, STATE_LIGHT, i,
					     STATE_SPOT_DIRECTION);
      struct ureg spot = get_temp(p);
      struct ureg slt = get_temp(p);
	       
      emit_normalize_vec3( p, spot, spot_dir ); /* XXX: precompute! */
      emit_op2(p, VP_OPCODE_DP3, spot, 0, negate(VPpli), spot_dir);
      emit_op2(p, VP_OPCODE_SLT, slt, 0, swizzle1(spot_dir,W), spot);
      emit_op2(p, VP_OPCODE_POW, spot, 0, spot, swizzle1(attenuation, W));
      emit_op2(p, VP_OPCODE_MUL, att, 0, slt, spot);

      release_temp(p, spot);
      release_temp(p, slt);
   }

   /* Calculate distance attenuation:
    */
   if (light->ConstantAttenuation != 1.0 ||
       light->LinearAttenuation != 1.0 ||
       light->QuadraticAttenuation != 1.0) {

      /* 1/d,d,d,1/d */
      emit_op1(p, VP_OPCODE_RCP, dist, WRITEMASK_YZ, dist); 
      /* 1,d,d*d,1/d */
      emit_op2(p, VP_OPCODE_MUL, dist, WRITEMASK_XZ, dist, swizzle1(dist,Y)); 
      /* 1/dist-atten */
      emit_op2(p, VP_OPCODE_DP3, dist, 0, attenuation, dist); 

      if (light->SpotCutoff != 180.0F) {
	 /* dist-atten */
	 emit_op1(p, VP_OPCODE_RCP, dist, 0, dist); 
	 /* spot-atten * dist-atten */
	 emit_op2(p, VP_OPCODE_MUL, att, 0, dist, att);	
      } else {
	 /* dist-atten */
	 emit_op1(p, VP_OPCODE_RCP, att, 0, dist); 
      }
   }

   return att;
}
						




/* Need to add some addtional parameters to allow lighting in object
 * space - STATE_SPOT_DIRECTION and STATE_HALF implicitly assume eye
 * space lighting.
 */
static void build_lighting( struct tnl_program *p )
{
   GLcontext *ctx = p->ctx;
   const GLboolean twoside = ctx->Light.Model.TwoSide;
   const GLboolean separate = (ctx->Light.Model.ColorControl ==
			       GL_SEPARATE_SPECULAR_COLOR);
   GLuint nr_lights = 0, count = 0;
   struct ureg normal = get_eye_normal(p);
   struct ureg lit = get_temp(p);
   struct ureg dots = get_temp(p);
   struct ureg _col0 = undef, _col1 = undef;
   struct ureg _bfc0 = undef, _bfc1 = undef;
   GLuint i;

   for (i = 0; i < MAX_LIGHTS; i++) 
      if (ctx->Light.Light[i].Enabled)
	 nr_lights++;
   
   set_material_flags(p);

   {
      struct ureg shininess = get_material(p, 0, STATE_SHININESS);
      emit_op1(p, VP_OPCODE_MOV, dots,  WRITEMASK_W, swizzle1(shininess,X));
      release_temp(p, shininess);

      _col0 = make_temp(p, get_scenecolor(p, 0));
      if (separate)
	 _col1 = make_temp(p, get_identity_param(p));
      else
	 _col1 = _col0;

   }

   if (twoside) {
      struct ureg shininess = get_material(p, 1, STATE_SHININESS);
      emit_op1(p, VP_OPCODE_MOV, dots, WRITEMASK_Z, 
	       negate(swizzle1(shininess,X)));
      release_temp(p, shininess);

      _bfc0 = make_temp(p, get_scenecolor(p, 1));
      if (separate)
	 _bfc1 = make_temp(p, get_identity_param(p));
      else
	 _bfc1 = _bfc0;
   }

   for (i = 0; i < MAX_LIGHTS; i++) {
      struct gl_light *light = &ctx->Light.Light[i];

      if (light->Enabled) {
	 struct ureg half = undef;
	 struct ureg att = undef, VPpli = undef;
	  
	 count++;

	 if (light->EyePosition[3] == 0) {
	    /* Can used precomputed constants in this case.
	     * Attenuation never applies to infinite lights.
	     */
	    VPpli = register_param3(p, STATE_LIGHT, i, 
				    STATE_POSITION_NORMALIZED); 
	    half = register_param3(p, STATE_LIGHT, i, STATE_HALF);
	 } 
	 else {
	    struct ureg Ppli = register_param3(p, STATE_LIGHT, i, 
					       STATE_POSITION); 
	    struct ureg V = get_eye_position(p);
	    struct ureg dist = get_temp(p);

	    VPpli = get_temp(p); 
	    half = get_temp(p);
 
	    /* Calulate VPpli vector
	     */
	    emit_op2(p, VP_OPCODE_SUB, VPpli, 0, Ppli, V); 

	    /* Normalize VPpli.  The dist value also used in
	     * attenuation below.
	     */
	    emit_op2(p, VP_OPCODE_DP3, dist, 0, VPpli, VPpli);
	    emit_op1(p, VP_OPCODE_RSQ, dist, 0, dist);
	    emit_op2(p, VP_OPCODE_MUL, VPpli, 0, VPpli, dist);


	    /* Calculate  attenuation:
	     */ 
	    if (light->SpotCutoff != 180.0 ||
		light->ConstantAttenuation != 1.0 ||
		light->LinearAttenuation != 1.0 ||
		light->QuadraticAttenuation != 1.0) {
	       att = calculate_light_attenuation(p, i, light, VPpli, dist);
	    }
	 
      
	    /* Calculate viewer direction, or use infinite viewer:
	     */
	    if (ctx->Light.Model.LocalViewer) {
	       struct ureg eye_hat = get_eye_position_normalized(p);
	       emit_op2(p, VP_OPCODE_SUB, half, 0, VPpli, eye_hat);
	    }
	    else {
	       struct ureg z_dir = swizzle(get_identity_param(p),X,Y,W,Z); 
	       emit_op2(p, VP_OPCODE_ADD, half, 0, VPpli, z_dir);
	    }

	    emit_normalize_vec3(p, half, half);

	    release_temp(p, dist);
	 }

	 /* Calculate dot products:
	  */
	 emit_op2(p, VP_OPCODE_DP3, dots, WRITEMASK_X, normal, VPpli);
	 emit_op2(p, VP_OPCODE_DP3, dots, WRITEMASK_Y, normal, half);

	
	 /* Front face lighting:
	  */
	 {
	    struct ureg ambient = get_lightprod(p, i, 0, STATE_AMBIENT);
	    struct ureg diffuse = get_lightprod(p, i, 0, STATE_DIFFUSE);
	    struct ureg specular = get_lightprod(p, i, 0, STATE_SPECULAR);
	    struct ureg res0, res1;

	    emit_op1(p, VP_OPCODE_LIT, lit, 0, dots);
   
	    if (!is_undef(att)) 
	       emit_op2(p, VP_OPCODE_MUL, lit, 0, lit, att);
   
	    
	    if (count == nr_lights) {
	       if (separate) {
		  res0 = register_output( p, VERT_RESULT_COL0 );
		  res1 = register_output( p, VERT_RESULT_COL1 );
	       }
	       else {
		  res0 = _col0;
		  res1 = register_output( p, VERT_RESULT_COL0 );
	       }
	    } else {
	       res0 = _col0;
	       res1 = _col1;
	    }

	    emit_op3(p, VP_OPCODE_MAD, _col0, 0, swizzle1(lit,X), ambient, _col0);
	    emit_op3(p, VP_OPCODE_MAD, res0, 0, swizzle1(lit,Y), diffuse, _col0);
	    emit_op3(p, VP_OPCODE_MAD, res1, 0, swizzle1(lit,Z), specular, _col1);
      
	    release_temp(p, ambient);
	    release_temp(p, diffuse);
	    release_temp(p, specular);
	 }

	 /* Back face lighting:
	  */
	 if (twoside) {
	    struct ureg ambient = get_lightprod(p, i, 1, STATE_AMBIENT);
	    struct ureg diffuse = get_lightprod(p, i, 1, STATE_DIFFUSE);
	    struct ureg specular = get_lightprod(p, i, 1, STATE_SPECULAR);
	    struct ureg res0, res1;
	       
	    emit_op1(p, VP_OPCODE_LIT, lit, 0, negate(swizzle(dots,X,Y,W,Z)));

	    if (!is_undef(att)) 
	       emit_op2(p, VP_OPCODE_MUL, lit, 0, lit, att);

	    if (count == nr_lights) {
	       if (separate) {
		  res0 = register_output( p, VERT_RESULT_BFC0 );
		  res1 = register_output( p, VERT_RESULT_BFC1 );
	       }
	       else {
		  res0 = _bfc0;
		  res1 = register_output( p, VERT_RESULT_BFC0 );
	       }
	    } else {
	       res0 = _bfc0;
	       res1 = _bfc1;
	    }


	    emit_op3(p, VP_OPCODE_MAD, _bfc0, 0, swizzle1(lit,X), ambient, _bfc0);
	    emit_op3(p, VP_OPCODE_MAD, res0, 0, swizzle1(lit,Y), diffuse, _bfc0);
	    emit_op3(p, VP_OPCODE_MAD, res1, 0, swizzle1(lit,Z), specular, _bfc1);

	    release_temp(p, ambient);
	    release_temp(p, diffuse);
	    release_temp(p, specular);
	 }

	 release_temp(p, half);
	 release_temp(p, VPpli);
	 release_temp(p, att);
      }
   }

   release_temps( p );
}


static void build_fog( struct tnl_program *p )
{
   GLcontext *ctx = p->ctx;
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct ureg fog = register_output(p, VERT_RESULT_FOGC);
   struct ureg input;
   
   if (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT) {
      input = swizzle1(get_eye_position(p), Z);
   }
   else {
      input = swizzle1(register_input(p, VERT_ATTRIB_FOG), X);
   }

   if (tnl->_DoVertexFog) {
      struct ureg params = register_param1(p, STATE_FOG_PARAMS);
      struct ureg tmp = get_temp(p);

      switch (ctx->Fog.Mode) {
      case GL_LINEAR: {
	 struct ureg id = get_identity_param(p);
	 emit_op2(p, VP_OPCODE_SUB, tmp, 0, swizzle1(params,Z), input); 
	 emit_op2(p, VP_OPCODE_MUL, tmp, 0, tmp, swizzle1(params,W)); 
	 emit_op2(p, VP_OPCODE_MAX, tmp, 0, tmp, swizzle1(id,X)); /* saturate */
	 emit_op2(p, VP_OPCODE_MIN, fog, WRITEMASK_X, tmp, swizzle1(id,W));
	 break;
      }
      case GL_EXP:
	 emit_op1(p, VP_OPCODE_ABS, tmp, 0, input); 
	 emit_op2(p, VP_OPCODE_MUL, tmp, 0, tmp, swizzle1(params,X)); 
	 emit_op2(p, VP_OPCODE_POW, fog, WRITEMASK_X, 
		  register_const1f(p, M_E), negate(tmp)); 
	 break;
      case GL_EXP2:
	 emit_op2(p, VP_OPCODE_MUL, tmp, 0, input, swizzle1(params,X)); 
	 emit_op2(p, VP_OPCODE_MUL, tmp, 0, tmp, tmp); 
	 emit_op2(p, VP_OPCODE_POW, fog, WRITEMASK_X, 
		  register_const1f(p, M_E), negate(tmp)); 
	 break;
      }
      
      release_temp(p, tmp);
   }
   else {
      /* results = incoming fog coords (compute fog per-fragment later) 
       *
       * KW:  Is it really necessary to do anything in this case?
       */
      emit_op1(p, VP_OPCODE_MOV, fog, WRITEMASK_X, input);
   }
}
 
static void build_reflect_texgen( struct tnl_program *p,
				  struct ureg dest,
				  GLuint writemask )
{
   struct ureg normal = get_eye_normal(p);
   struct ureg eye_hat = get_eye_position_normalized(p);
   struct ureg tmp = get_temp(p);

   /* n.u */
   emit_op2(p, VP_OPCODE_DP3, tmp, 0, normal, eye_hat); 
   /* 2n.u */
   emit_op2(p, VP_OPCODE_ADD, tmp, 0, tmp, tmp); 
   /* (-2n.u)n + u */
   emit_op3(p, VP_OPCODE_MAD, dest, writemask, negate(tmp), normal, eye_hat);
}

static void build_sphere_texgen( struct tnl_program *p,
				 struct ureg dest,
				 GLuint writemask )
{
   struct ureg normal = get_eye_normal(p);
   struct ureg eye_hat = get_eye_position_normalized(p);
   struct ureg tmp = get_temp(p);
   struct ureg half = register_const1f(p, .5);
   struct ureg r = get_temp(p);
   struct ureg inv_m = get_temp(p);
   struct ureg id = get_identity_param(p);

   /* Could share the above calculations, but it would be
    * a fairly odd state for someone to set (both sphere and
    * reflection active for different texture coordinate
    * components.  Of course - if two texture units enable
    * reflect and/or sphere, things start to tilt in favour
    * of seperating this out:
    */

   /* n.u */
   emit_op2(p, VP_OPCODE_DP3, tmp, 0, normal, eye_hat); 
   /* 2n.u */
   emit_op2(p, VP_OPCODE_ADD, tmp, 0, tmp, tmp); 
   /* (-2n.u)n + u */
   emit_op3(p, VP_OPCODE_MAD, r, 0, negate(tmp), normal, eye_hat); 
   /* r + 0,0,1 */
   emit_op2(p, VP_OPCODE_ADD, tmp, 0, r, swizzle(id,X,Y,W,Z)); 
   /* rx^2 + ry^2 + (rz+1)^2 */
   emit_op2(p, VP_OPCODE_DP3, tmp, 0, tmp, tmp); 
   /* 2/m */
   emit_op1(p, VP_OPCODE_RSQ, tmp, 0, tmp); 
   /* 1/m */
   emit_op2(p, VP_OPCODE_MUL, inv_m, 0, tmp, swizzle1(half,X)); 
   /* r/m + 1/2 */
   emit_op3(p, VP_OPCODE_MAD, dest, writemask, r, inv_m, swizzle1(half,X)); 
	       
   release_temp(p, tmp);
   release_temp(p, r);
   release_temp(p, inv_m);
}


static void build_texture_transform( struct tnl_program *p )
{
   GLcontext *ctx = p->ctx;
   GLuint i, j;

   for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {
      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
      GLuint texmat_enabled = ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i);
      struct ureg out = register_output(p, VERT_RESULT_TEX0 + i);

      if (texUnit->TexGenEnabled || texmat_enabled) {
	 struct ureg out_texgen = undef;

	 if (texUnit->TexGenEnabled) {
	    GLuint copy_mask = 0;
	    GLuint sphere_mask = 0;
	    GLuint reflect_mask = 0;
	    GLuint normal_mask = 0;
	    GLuint modes[4];
	 
	    if (texmat_enabled) 
	       out_texgen = get_temp(p);
	    else
	       out_texgen = out;

	    modes[0] = texUnit->GenModeS;
	    modes[1] = texUnit->GenModeT;
	    modes[2] = texUnit->GenModeR;
	    modes[3] = texUnit->GenModeQ;

	    for (j = 0; j < 4; j++) {
	       if (texUnit->TexGenEnabled & (1<<j)) {
		  switch (modes[j]) {
		  case GL_OBJECT_LINEAR: {
		     struct ureg obj = register_input(p, VERT_ATTRIB_POS);
		     struct ureg plane = 
			register_param3(p, STATE_TEXGEN, i,
					STATE_TEXGEN_OBJECT_S + j);

		     emit_op2(p, VP_OPCODE_DP4, out_texgen, WRITEMASK_X << j, 
			      obj, plane );
		     break;
		  }
		  case GL_EYE_LINEAR: {
		     struct ureg eye = get_eye_position(p);
		     struct ureg plane = 
			register_param3(p, STATE_TEXGEN, i, 
					STATE_TEXGEN_EYE_S + j);

		     emit_op2(p, VP_OPCODE_DP4, out_texgen, WRITEMASK_X << j, 
			      eye, plane );
		     break;
		  }
		  case GL_SPHERE_MAP: 
		     sphere_mask |= WRITEMASK_X << j;
		     break;
		  case GL_REFLECTION_MAP_NV:
		     reflect_mask |= WRITEMASK_X << j;
		     break;
		  case GL_NORMAL_MAP_NV: 
		     normal_mask |= WRITEMASK_X << j;
		     break;
		  }
	       }
	       else 
		  copy_mask |= WRITEMASK_X << j;
	    }

	 
	    if (sphere_mask) {
	       build_sphere_texgen(p, out_texgen, sphere_mask);
	    }

	    if (reflect_mask) {
	       build_reflect_texgen(p, out_texgen, reflect_mask);
	    }

	    if (normal_mask) {
	       struct ureg normal = get_eye_normal(p);
	       emit_op1(p, VP_OPCODE_MOV, out_texgen, normal_mask, normal );
	    }

	    if (copy_mask) {
	       struct ureg in = register_input(p, VERT_ATTRIB_TEX0+i);
	       emit_op1(p, VP_OPCODE_MOV, out_texgen, copy_mask, in );
	    }
	 }

	 if (texmat_enabled) {
	    struct ureg texmat[4];
	    struct ureg in = (!is_undef(out_texgen) ? 
			      out_texgen : 
			      register_input(p, VERT_ATTRIB_TEX0+i));
	    register_matrix_param6( p, STATE_MATRIX, STATE_TEXTURE, i, 
				    0, 3, 0, texmat );
	    emit_matrix_transform_vec4( p, out, texmat, in );
	 }

	 release_temps(p);
      }
   }
}


/* Seems like it could be tighter:
 */
static void build_pointsize( struct tnl_program *p )
{
   struct ureg eye = get_eye_position(p);
   struct ureg state_size = register_param1(p, STATE_POINT_SIZE);
   struct ureg state_attenuation = register_param1(p, STATE_POINT_ATTENUATION);
   struct ureg out = register_output(p, VERT_RESULT_PSIZ);
   struct ureg ut = get_temp(p);

   /* 1, -Z, Z * Z, 1 */      
   emit_op1(p, VP_OPCODE_MOV, ut, 0, swizzle1(get_identity_param(p), W));
   emit_op2(p, VP_OPCODE_MUL, ut, WRITEMASK_YZ, ut, negate(swizzle1(eye, Z)));
   emit_op2(p, VP_OPCODE_MUL, ut, WRITEMASK_Z, ut, negate(swizzle1(eye, Z)));


   /* p1 +  p2 * dist + p3 * dist * dist, 0 */
   emit_op2(p, VP_OPCODE_DP3, ut, 0, ut, state_attenuation);

   /* 1 / factor */
   emit_op1(p, VP_OPCODE_RCP, ut, 0, ut ); 

   /* out = pointSize / factor */
   emit_op2(p, VP_OPCODE_MUL, out, WRITEMASK_X, ut, state_size); 

   release_temp(p, ut);
}


static void build_passthrough( struct tnl_program *p, GLuint inputs )
{
}



void _tnl_UpdateFixedFunctionProgram( GLcontext *ctx )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct tnl_program p;

   if (ctx->VertexProgram._Enabled)
      return;

   memset(&p, 0, sizeof(p));
   p.ctx = ctx;
   p.program = &ctx->_TnlProgram;
   
   p.eye_position = undef;
   p.eye_position_normalized = undef;
   p.eye_normal = undef;
   p.identity = undef;

   p.temp_flag = 0;
   p.temp_reserved = ~((1<<MAX_NV_VERTEX_PROGRAM_TEMPS)-1);

   if (p.program->Instructions == NULL) {
      p.program->Instructions = MALLOC(sizeof(struct vp_instruction) * 100);
   }

   /* Initialize the arb_program struct */
   p.program->Base.String = 0;
   p.program->Base.NumInstructions =
   p.program->Base.NumTemporaries =
   p.program->Base.NumParameters =
   p.program->Base.NumAttributes = p.program->Base.NumAddressRegs = 0;
   if (p.program->Parameters)
      _mesa_free_parameter_list(p.program->Parameters);
   p.program->Parameters = _mesa_new_parameter_list ();
   p.program->InputsRead = 0;
   p.program->OutputsWritten = 0;

   /* Emit the program, starting with modelviewproject:
    */
   build_hpos(&p);

   /* Lighting calculations:
    */
   if (ctx->Light.Enabled)
      build_lighting(&p);

   if (ctx->Fog.Enabled)
      build_fog(&p);

   if (ctx->Texture._TexGenEnabled || ctx->Texture._TexMatEnabled)
      build_texture_transform(&p);

   if (ctx->Point._Attenuated)
      build_pointsize(&p);

   /* Is there a need to copy inputs to outputs?  The software
    * implementation might do this more efficiently by just assigning
    * the missing results to point at input arrays.
    */
   if (/* tnl->vp_copy_inputs &&  */
       (tnl->render_inputs & ~p.program->OutputsWritten)) {
      build_passthrough(&p, tnl->render_inputs);
   }


   /* Finish up:
    */
   emit_op1(&p, VP_OPCODE_END, undef, 0, undef);

   /* Disassemble:
    */
   if (DISASSEM) {
      _mesa_printf ("\n");
   }
}