aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/main/texenv.c
blob: e8f3af082a5ddadd6f7363e7710707dc41825021 (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
/*
 * Mesa 3-D graphics library
 * Version:  7.5
 *
 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
 * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/** 
 * \file texenv.c
 *
 * glTexEnv-related functions
 */


#include "main/glheader.h"
#include "main/context.h"
#include "main/enums.h"
#include "main/macros.h"
#include "main/mtypes.h"
#include "main/state.h"
#include "main/texenv.h"
#include "main/texstate.h"


#define TE_ERROR(errCode, msg, value)				\
   _mesa_error(ctx, errCode, msg, _mesa_lookup_enum_by_nr(value));


/** Set texture env mode */
static void
set_env_mode(struct gl_context *ctx,
             struct gl_texture_unit *texUnit,
             GLenum mode)
{
   GLboolean legal;

   if (texUnit->EnvMode == mode)
      return;

   switch (mode) {
   case GL_MODULATE:
   case GL_BLEND:
   case GL_DECAL:
   case GL_REPLACE:
   case GL_ADD:
   case GL_COMBINE:
      legal = GL_TRUE;
      break;
   case GL_REPLACE_EXT:
      mode = GL_REPLACE; /* GL_REPLACE_EXT != GL_REPLACE */
      legal = GL_TRUE;
      break;
   case GL_COMBINE4_NV:
      legal = ctx->Extensions.NV_texture_env_combine4;
      break;
   default:
      legal = GL_FALSE;
   }

   if (legal) {
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->EnvMode = mode;
   }
   else {
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
   }
}


static void
set_env_color(struct gl_context *ctx,
              struct gl_texture_unit *texUnit,
              const GLfloat *color)
{
   if (TEST_EQ_4V(color, texUnit->EnvColorUnclamped))
      return;
   FLUSH_VERTICES(ctx, _NEW_TEXTURE);
   COPY_4FV(texUnit->EnvColorUnclamped, color);
   texUnit->EnvColor[0] = CLAMP(color[0], 0.0F, 1.0F);
   texUnit->EnvColor[1] = CLAMP(color[1], 0.0F, 1.0F);
   texUnit->EnvColor[2] = CLAMP(color[2], 0.0F, 1.0F);
   texUnit->EnvColor[3] = CLAMP(color[3], 0.0F, 1.0F);
}


/** Set an RGB or A combiner mode/function */
static void
set_combiner_mode(struct gl_context *ctx,
                  struct gl_texture_unit *texUnit,
                  GLenum pname, GLenum mode)
{
   GLboolean legal;

   switch (mode) {
   case GL_REPLACE:
   case GL_MODULATE:
   case GL_ADD:
   case GL_ADD_SIGNED:
   case GL_INTERPOLATE:
      legal = GL_TRUE;
      break;
   case GL_SUBTRACT:
      legal = ctx->Extensions.ARB_texture_env_combine;
      break;
   case GL_DOT3_RGB_EXT:
   case GL_DOT3_RGBA_EXT:
      legal = (ctx->API == API_OPENGL_COMPAT &&
               ctx->Extensions.EXT_texture_env_dot3 &&
               pname == GL_COMBINE_RGB);
      break;
   case GL_DOT3_RGB:
   case GL_DOT3_RGBA:
      legal = (ctx->Extensions.ARB_texture_env_dot3 &&
               pname == GL_COMBINE_RGB);
      break;
   case GL_MODULATE_ADD_ATI:
   case GL_MODULATE_SIGNED_ADD_ATI:
   case GL_MODULATE_SUBTRACT_ATI:
      legal = (ctx->API == API_OPENGL_COMPAT &&
               ctx->Extensions.ATI_texture_env_combine3);
      break;
   case GL_BUMP_ENVMAP_ATI:
      legal = (ctx->API == API_OPENGL_COMPAT &&
               ctx->Extensions.ATI_envmap_bumpmap &&
               pname == GL_COMBINE_RGB);
      break;
   default:
      legal = GL_FALSE;
   }

   if (!legal) {
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
      return;
   }

   switch (pname) {
   case GL_COMBINE_RGB:
      if (texUnit->Combine.ModeRGB == mode)
         return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->Combine.ModeRGB = mode;
      break;

   case GL_COMBINE_ALPHA:
      if (texUnit->Combine.ModeA == mode)
         return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->Combine.ModeA = mode;
      break;
   default:
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
   }
}



/** Set an RGB or A combiner source term */
static void
set_combiner_source(struct gl_context *ctx,
                    struct gl_texture_unit *texUnit,
                    GLenum pname, GLenum param)
{
   GLuint term;
   GLboolean alpha, legal;

   /*
    * Translate pname to (term, alpha).
    *
    * The enums were given sequential values for a reason.
    */
   switch (pname) {
   case GL_SOURCE0_RGB:
   case GL_SOURCE1_RGB:
   case GL_SOURCE2_RGB:
   case GL_SOURCE3_RGB_NV:
      term = pname - GL_SOURCE0_RGB;
      alpha = GL_FALSE;
      break;
   case GL_SOURCE0_ALPHA:
   case GL_SOURCE1_ALPHA:
   case GL_SOURCE2_ALPHA:
   case GL_SOURCE3_ALPHA_NV:
      term = pname - GL_SOURCE0_ALPHA;
      alpha = GL_TRUE;
      break;
   default:
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
      return;
   }

   if ((term == 3) && (ctx->API != API_OPENGL_COMPAT
                       || !ctx->Extensions.NV_texture_env_combine4)) {
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
      return;
   }

   assert(term < MAX_COMBINER_TERMS);

   /*
    * Error-check param (the source term)
    */
   switch (param) {
   case GL_TEXTURE:
   case GL_CONSTANT:
   case GL_PRIMARY_COLOR:
   case GL_PREVIOUS:
      legal = GL_TRUE;
      break;
   case GL_TEXTURE0:
   case GL_TEXTURE1:
   case GL_TEXTURE2:
   case GL_TEXTURE3:
   case GL_TEXTURE4:
   case GL_TEXTURE5:
   case GL_TEXTURE6:
   case GL_TEXTURE7:
      legal = (ctx->Extensions.ARB_texture_env_crossbar &&
               param - GL_TEXTURE0 < ctx->Const.MaxTextureUnits);
      break;
   case GL_ZERO:
      legal = (ctx->API == API_OPENGL_COMPAT &&
               (ctx->Extensions.ATI_texture_env_combine3 ||
                ctx->Extensions.NV_texture_env_combine4));
      break;
   case GL_ONE:
      legal = (ctx->API == API_OPENGL_COMPAT &&
               ctx->Extensions.ATI_texture_env_combine3);
      break;
   default:
      legal = GL_FALSE;
   }

   if (!legal) {
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", param);
      return;
   }

   FLUSH_VERTICES(ctx, _NEW_TEXTURE);

   if (alpha)
      texUnit->Combine.SourceA[term] = param;
   else
      texUnit->Combine.SourceRGB[term] = param;
}


/** Set an RGB or A combiner operand term */
static void
set_combiner_operand(struct gl_context *ctx,
                     struct gl_texture_unit *texUnit,
                     GLenum pname, GLenum param)
{
   GLuint term;
   GLboolean alpha, legal;

   /* The enums were given sequential values for a reason.
    */
   switch (pname) {
   case GL_OPERAND0_RGB:
   case GL_OPERAND1_RGB:
   case GL_OPERAND2_RGB:
   case GL_OPERAND3_RGB_NV:
      term = pname - GL_OPERAND0_RGB;
      alpha = GL_FALSE;
      break;
   case GL_OPERAND0_ALPHA:
   case GL_OPERAND1_ALPHA:
   case GL_OPERAND2_ALPHA:
   case GL_OPERAND3_ALPHA_NV:
      term = pname - GL_OPERAND0_ALPHA;
      alpha = GL_TRUE;
      break;
   default:
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
      return;
   }

   if ((term == 3) && (ctx->API != API_OPENGL_COMPAT
                       || !ctx->Extensions.NV_texture_env_combine4)) {
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
      return;
   }

   assert(term < MAX_COMBINER_TERMS);

   /*
    * Error-check param (the source operand)
    */
   switch (param) {
   case GL_SRC_COLOR:
   case GL_ONE_MINUS_SRC_COLOR:
      /* The color input can only be used with GL_OPERAND[01]_RGB in the EXT
       * version.  In the ARB and NV versions and OpenGL ES 1.x they can be
       * used for any RGB operand.
       */
      legal = !alpha
	 && ((term < 2) || ctx->Extensions.ARB_texture_env_combine
	     || ctx->Extensions.NV_texture_env_combine4);
      break;
   case GL_ONE_MINUS_SRC_ALPHA:
      /* GL_ONE_MINUS_SRC_ALPHA can only be used with
       * GL_OPERAND[01]_(RGB|ALPHA) in the EXT version.  In the ARB and NV
       * versions and OpenGL ES 1.x it can be used for any operand.
       */
      legal = (term < 2) || ctx->Extensions.ARB_texture_env_combine
	 || ctx->Extensions.NV_texture_env_combine4;
      break;
   case GL_SRC_ALPHA:
      legal = GL_TRUE;
      break;
   default:
      legal = GL_FALSE;
   }

   if (!legal) {
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", param);
      return;
   }

   FLUSH_VERTICES(ctx, _NEW_TEXTURE);

   if (alpha)
      texUnit->Combine.OperandA[term] = param;
   else
      texUnit->Combine.OperandRGB[term] = param;
}


static void
set_combiner_scale(struct gl_context *ctx,
                   struct gl_texture_unit *texUnit,
                   GLenum pname, GLfloat scale)
{
   GLuint shift;

   if (scale == 1.0F) {
      shift = 0;
   }
   else if (scale == 2.0F) {
      shift = 1;
   }
   else if (scale == 4.0F) {
      shift = 2;
   }
   else {
      _mesa_error( ctx, GL_INVALID_VALUE,
                   "glTexEnv(GL_RGB_SCALE not 1, 2 or 4)" );
      return;
   }

   switch (pname) {
   case GL_RGB_SCALE:
      if (texUnit->Combine.ScaleShiftRGB == shift)
         return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->Combine.ScaleShiftRGB = shift;
      break;
   case GL_ALPHA_SCALE:
      if (texUnit->Combine.ScaleShiftA == shift)
         return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      texUnit->Combine.ScaleShiftA = shift;
      break;
   default:
      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
   }
}



void GLAPIENTRY
_mesa_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
{
   const GLint iparam0 = (GLint) param[0];
   struct gl_texture_unit *texUnit;
   GLuint maxUnit;

   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
      ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
   if (ctx->Texture.CurrentUnit >= maxUnit) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexEnvfv(current unit)");
      return;
   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   if (target == GL_TEXTURE_ENV) {
      switch (pname) {
      case GL_TEXTURE_ENV_MODE:
         set_env_mode(ctx, texUnit, (GLenum) iparam0);
         break;
      case GL_TEXTURE_ENV_COLOR:
         set_env_color(ctx, texUnit, param);
         break;
      case GL_COMBINE_RGB:
      case GL_COMBINE_ALPHA:
         set_combiner_mode(ctx, texUnit, pname, (GLenum) iparam0);
	 break;
      case GL_SOURCE0_RGB:
      case GL_SOURCE1_RGB:
      case GL_SOURCE2_RGB:
      case GL_SOURCE3_RGB_NV:
      case GL_SOURCE0_ALPHA:
      case GL_SOURCE1_ALPHA:
      case GL_SOURCE2_ALPHA:
      case GL_SOURCE3_ALPHA_NV:
         set_combiner_source(ctx, texUnit, pname, (GLenum) iparam0);
	 break;
      case GL_OPERAND0_RGB:
      case GL_OPERAND1_RGB:
      case GL_OPERAND2_RGB:
      case GL_OPERAND3_RGB_NV:
      case GL_OPERAND0_ALPHA:
      case GL_OPERAND1_ALPHA:
      case GL_OPERAND2_ALPHA:
      case GL_OPERAND3_ALPHA_NV:
         set_combiner_operand(ctx, texUnit, pname, (GLenum) iparam0);
	 break;
      case GL_RGB_SCALE:
      case GL_ALPHA_SCALE:
         set_combiner_scale(ctx, texUnit, pname, param[0]);
	 break;
      case GL_BUMP_TARGET_ATI:
         if (ctx->API != API_OPENGL_COMPAT || !ctx->Extensions.ATI_envmap_bumpmap) {
	    _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname=0x%x)", pname );
	    return;
	 }
	 if ((iparam0 < GL_TEXTURE0) ||
             (iparam0 > GL_TEXTURE31)) {
	    /* spec doesn't say this but it seems logical */
	    _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(param=0x%x)", iparam0);
	    return;
	 }
	 if (!((1 << (iparam0 - GL_TEXTURE0)) & ctx->Const.SupportedBumpUnits)) {
	    _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", iparam0);
	    return;
	 }
	 else {
	    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
	    texUnit->BumpTarget = iparam0;
	 }
	 break;
      default:
	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
	 return;
      }
   }
   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
	 if (texUnit->LodBias == param[0])
	    return;
	 FLUSH_VERTICES(ctx, _NEW_TEXTURE);
         texUnit->LodBias = param[0];
      }
      else {
         TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
	 return;
      }
   }
   else if (target == GL_POINT_SPRITE_NV) {
      /* GL_ARB_point_sprite / GL_NV_point_sprite */
      if (!ctx->Extensions.NV_point_sprite
	  && !ctx->Extensions.ARB_point_sprite) {
	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
	 return;
      }
      if (pname == GL_COORD_REPLACE_NV) {
         if (iparam0 == GL_TRUE || iparam0 == GL_FALSE) {
            /* It's kind of weird to set point state via glTexEnv,
             * but that's what the spec calls for.
             */
            const GLboolean state = (GLboolean) iparam0;
            if (ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] == state)
               return;
            FLUSH_VERTICES(ctx, _NEW_POINT);
            ctx->Point.CoordReplace[ctx->Texture.CurrentUnit] = state;
         }
         else {
            _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", iparam0);
            return;
         }
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname=0x%x)", pname );
         return;
      }
   }
   else {
      _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)",target );
      return;
   }

   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
      _mesa_debug(ctx, "glTexEnv %s %s %.1f(%s) ...\n",
                  _mesa_lookup_enum_by_nr(target),
                  _mesa_lookup_enum_by_nr(pname),
                  *param,
                  _mesa_lookup_enum_by_nr((GLenum) iparam0));

   /* Tell device driver about the new texture environment */
   if (ctx->Driver.TexEnv) {
      (*ctx->Driver.TexEnv)( ctx, target, pname, param );
   }
}


void GLAPIENTRY
_mesa_TexEnvf( GLenum target, GLenum pname, GLfloat param )
{
   GLfloat p[4];
   p[0] = param;
   p[1] = p[2] = p[3] = 0.0;
   _mesa_TexEnvfv( target, pname, p );
}



void GLAPIENTRY
_mesa_TexEnvi( GLenum target, GLenum pname, GLint param )
{
   GLfloat p[4];
   p[0] = (GLfloat) param;
   p[1] = p[2] = p[3] = 0.0;
   _mesa_TexEnvfv( target, pname, p );
}


void GLAPIENTRY
_mesa_TexEnviv( GLenum target, GLenum pname, const GLint *param )
{
   GLfloat p[4];
   if (pname == GL_TEXTURE_ENV_COLOR) {
      p[0] = INT_TO_FLOAT( param[0] );
      p[1] = INT_TO_FLOAT( param[1] );
      p[2] = INT_TO_FLOAT( param[2] );
      p[3] = INT_TO_FLOAT( param[3] );
   }
   else {
      p[0] = (GLfloat) param[0];
      p[1] = p[2] = p[3] = 0;  /* init to zero, just to be safe */
   }
   _mesa_TexEnvfv( target, pname, p );
}



/**
 * Helper for glGetTexEnvi/f()
 * \return  value of queried pname or -1 if error.
 */
static GLint
get_texenvi(struct gl_context *ctx, const struct gl_texture_unit *texUnit,
            GLenum pname)
{
   switch (pname) {
   case GL_TEXTURE_ENV_MODE:
      return texUnit->EnvMode;
      break;
   case GL_COMBINE_RGB:
      return texUnit->Combine.ModeRGB;
   case GL_COMBINE_ALPHA:
      return texUnit->Combine.ModeA;
   case GL_SOURCE0_RGB:
   case GL_SOURCE1_RGB:
   case GL_SOURCE2_RGB: {
      const unsigned rgb_idx = pname - GL_SOURCE0_RGB;
      return texUnit->Combine.SourceRGB[rgb_idx];
   }
   case GL_SOURCE3_RGB_NV:
      if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
         return texUnit->Combine.SourceRGB[3];
      }
      else {
         _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
      }
      break;
   case GL_SOURCE0_ALPHA:
   case GL_SOURCE1_ALPHA:
   case GL_SOURCE2_ALPHA: {
      const unsigned alpha_idx = pname - GL_SOURCE0_ALPHA;
      return texUnit->Combine.SourceA[alpha_idx];
   }
   case GL_SOURCE3_ALPHA_NV:
      if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
         return texUnit->Combine.SourceA[3];
      }
      else {
         _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
      }
      break;
   case GL_OPERAND0_RGB:
   case GL_OPERAND1_RGB:
   case GL_OPERAND2_RGB: {
      const unsigned op_rgb = pname - GL_OPERAND0_RGB;
      return texUnit->Combine.OperandRGB[op_rgb];
   }
   case GL_OPERAND3_RGB_NV:
      if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
         return texUnit->Combine.OperandRGB[3];
      }
      else {
         _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
      }
      break;
   case GL_OPERAND0_ALPHA:
   case GL_OPERAND1_ALPHA:
   case GL_OPERAND2_ALPHA: {
      const unsigned op_alpha = pname - GL_OPERAND0_ALPHA;
      return texUnit->Combine.OperandA[op_alpha];
   }
   case GL_OPERAND3_ALPHA_NV:
      if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
         return texUnit->Combine.OperandA[3];
      }
      else {
         _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
      }
      break;
   case GL_RGB_SCALE:
      return 1 << texUnit->Combine.ScaleShiftRGB;
   case GL_ALPHA_SCALE:
      return 1 << texUnit->Combine.ScaleShiftA;
   case GL_BUMP_TARGET_ATI:
      /* spec doesn't say so, but I think this should be queryable */
      if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.ATI_envmap_bumpmap) {
         return texUnit->BumpTarget;
      }
      else {
         _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
      }
      break;

   default:
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
      break;
   }

   return -1; /* error */
}



void GLAPIENTRY
_mesa_GetTexEnvfv( GLenum target, GLenum pname, GLfloat *params )
{
   GLuint maxUnit;
   const struct gl_texture_unit *texUnit;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
      ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
   if (ctx->Texture.CurrentUnit >= maxUnit) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnvfv(current unit)");
      return;
   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   if (target == GL_TEXTURE_ENV) {
      if (pname == GL_TEXTURE_ENV_COLOR) {
         if(ctx->NewState & (_NEW_BUFFERS | _NEW_FRAG_CLAMP))
            _mesa_update_state(ctx);
         if(ctx->Color._ClampFragmentColor)
            COPY_4FV( params, texUnit->EnvColor );
         else
            COPY_4FV( params, texUnit->EnvColorUnclamped );
      }
      else {
         GLint val = get_texenvi(ctx, texUnit, pname);
         if (val >= 0) {
            *params = (GLfloat) val;
         }
      }
   }
   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
         *params = texUnit->LodBias;
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
	 return;
      }
   }
   else if (target == GL_POINT_SPRITE_NV) {
      /* GL_ARB_point_sprite / GL_NV_point_sprite */
      if (!ctx->Extensions.NV_point_sprite
	  && !ctx->Extensions.ARB_point_sprite) {
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
         return;
      }
      if (pname == GL_COORD_REPLACE_NV) {
         *params = (GLfloat) ctx->Point.CoordReplace[ctx->Texture.CurrentUnit];
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
         return;
      }
   }
   else {
      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
      return;
   }
}


void GLAPIENTRY
_mesa_GetTexEnviv( GLenum target, GLenum pname, GLint *params )
{
   GLuint maxUnit;
   const struct gl_texture_unit *texUnit;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
      ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
   if (ctx->Texture.CurrentUnit >= maxUnit) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnviv(current unit)");
      return;
   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   if (target == GL_TEXTURE_ENV) {
      if (pname == GL_TEXTURE_ENV_COLOR) {
         params[0] = FLOAT_TO_INT( texUnit->EnvColor[0] );
         params[1] = FLOAT_TO_INT( texUnit->EnvColor[1] );
         params[2] = FLOAT_TO_INT( texUnit->EnvColor[2] );
         params[3] = FLOAT_TO_INT( texUnit->EnvColor[3] );
      }
      else {
         GLint val = get_texenvi(ctx, texUnit, pname);
         if (val >= 0) {
            *params = val;
         }
      }
   }
   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
         *params = (GLint) texUnit->LodBias;
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
	 return;
      }
   }
   else if (target == GL_POINT_SPRITE_NV) {
      /* GL_ARB_point_sprite / GL_NV_point_sprite */
      if (!ctx->Extensions.NV_point_sprite
	  && !ctx->Extensions.ARB_point_sprite) {
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
         return;
      }
      if (pname == GL_COORD_REPLACE_NV) {
         *params = (GLint) ctx->Point.CoordReplace[ctx->Texture.CurrentUnit];
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
         return;
      }
   }
   else {
      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
      return;
   }
}


/**
 * Why does ATI_envmap_bumpmap require new entrypoints? Should just
 * reuse TexEnv ones...
 */
void GLAPIENTRY
_mesa_TexBumpParameterivATI( GLenum pname, const GLint *param )
{
   GLfloat p[4];
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.ATI_envmap_bumpmap) {
      /* This isn't an "official" error case, but let's tell the user
       * that something's wrong.
       */
      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBumpParameterivATI");
      return;
   }

   if (pname == GL_BUMP_ROT_MATRIX_ATI) {
      /* hope that conversion is correct here */
      p[0] = INT_TO_FLOAT( param[0] );
      p[1] = INT_TO_FLOAT( param[1] );
      p[2] = INT_TO_FLOAT( param[2] );
      p[3] = INT_TO_FLOAT( param[3] );
   }
   else {
      p[0] = (GLfloat) param[0];
      p[1] = p[2] = p[3] = 0.0F;  /* init to zero, just to be safe */
   }
   _mesa_TexBumpParameterfvATI( pname, p );
}


void GLAPIENTRY
_mesa_TexBumpParameterfvATI( GLenum pname, const GLfloat *param )
{
   struct gl_texture_unit *texUnit;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.ATI_envmap_bumpmap) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexBumpParameterfvATI");
      return;
   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   if (pname == GL_BUMP_ROT_MATRIX_ATI) {
      if (TEST_EQ_4V(param, texUnit->RotMatrix))
         return;
      FLUSH_VERTICES(ctx, _NEW_TEXTURE);
      COPY_4FV(texUnit->RotMatrix, param);
   }
   else {
      _mesa_error( ctx, GL_INVALID_ENUM, "glTexBumpParameter(pname)" );
      return;
   }
   /* Drivers might want to know about this, instead of dedicated function
      just shove it into TexEnv where it really belongs anyway */
   if (ctx->Driver.TexEnv) {
      (*ctx->Driver.TexEnv)( ctx, 0, pname, param );
   }
}


void GLAPIENTRY
_mesa_GetTexBumpParameterivATI( GLenum pname, GLint *param )
{
   const struct gl_texture_unit *texUnit;
   GLuint i;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.ATI_envmap_bumpmap) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexBumpParameterivATI");
      return;
   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   if (pname == GL_BUMP_ROT_MATRIX_SIZE_ATI) {
      /* spec leaves open to support larger matrices.
         Don't think anyone would ever want to use it
         (and apps almost certainly would not understand it and
         thus fail to submit matrices correctly) so hardcode this. */
      *param = 4;
   }
   else if (pname == GL_BUMP_ROT_MATRIX_ATI) {
      /* hope that conversion is correct here */
      param[0] = FLOAT_TO_INT(texUnit->RotMatrix[0]);
      param[1] = FLOAT_TO_INT(texUnit->RotMatrix[1]);
      param[2] = FLOAT_TO_INT(texUnit->RotMatrix[2]);
      param[3] = FLOAT_TO_INT(texUnit->RotMatrix[3]);
   }
   else if (pname == GL_BUMP_NUM_TEX_UNITS_ATI) {
      GLint count = 0;
      for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
         if (ctx->Const.SupportedBumpUnits & (1 << i)) {
            count++;
         }
      }
      *param = count;
   }
   else if (pname == GL_BUMP_TEX_UNITS_ATI) {
      for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
         if (ctx->Const.SupportedBumpUnits & (1 << i)) {
            *param++ = i + GL_TEXTURE0;
         }
      }
   }
   else {
      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexBumpParameter(pname)" );
      return;
   }
}


void GLAPIENTRY
_mesa_GetTexBumpParameterfvATI( GLenum pname, GLfloat *param )
{
   const struct gl_texture_unit *texUnit;
   GLuint i;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.ATI_envmap_bumpmap) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexBumpParameterfvATI");
      return;
   }

   texUnit = _mesa_get_current_tex_unit(ctx);

   if (pname == GL_BUMP_ROT_MATRIX_SIZE_ATI) {
      /* spec leaves open to support larger matrices.
         Don't think anyone would ever want to use it
         (and apps might not understand it) so hardcode this. */
      *param = 4.0F;
   }
   else if (pname == GL_BUMP_ROT_MATRIX_ATI) {
      param[0] = texUnit->RotMatrix[0];
      param[1] = texUnit->RotMatrix[1];
      param[2] = texUnit->RotMatrix[2];
      param[3] = texUnit->RotMatrix[3];
   }
   else if (pname == GL_BUMP_NUM_TEX_UNITS_ATI) {
      GLint count = 0;
      for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
         if (ctx->Const.SupportedBumpUnits & (1 << i)) {
            count++;
         }
      }
      *param = (GLfloat) count;
   }
   else if (pname == GL_BUMP_TEX_UNITS_ATI) {
      for (i = 0; i < ctx->Const.MaxTextureImageUnits; i++) {
         if (ctx->Const.SupportedBumpUnits & (1 << i)) {
            *param++ = (GLfloat) (i + GL_TEXTURE0);
         }
      }
   }
   else {
      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexBumpParameter(pname)" );
      return;
   }
}