1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
5 * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26/**
27 * \file texenv.c
28 *
29 * glTexEnv-related functions
30 */
31
32
33#include "main/glheader.h"
34#include "main/context.h"
35#include "main/blend.h"
36#include "main/enums.h"
37#include "main/macros.h"
38#include "main/mtypes.h"
39#include "main/state.h"
40#include "main/texenv.h"
41#include "main/texstate.h"
42
43
44#define TE_ERROR(errCode, msg, value)				\
45   _mesa_error(ctx, errCode, msg, _mesa_enum_to_string(value));
46
47
48/** Set texture env mode */
49static void
50set_env_mode(struct gl_context *ctx,
51             struct gl_fixedfunc_texture_unit *texUnit,
52             GLenum mode)
53{
54   GLboolean legal;
55
56   if (texUnit->EnvMode == mode)
57      return;
58
59   switch (mode) {
60   case GL_MODULATE:
61   case GL_BLEND:
62   case GL_DECAL:
63   case GL_REPLACE:
64   case GL_ADD:
65   case GL_COMBINE:
66      legal = GL_TRUE;
67      break;
68   case GL_REPLACE_EXT:
69      mode = GL_REPLACE; /* GL_REPLACE_EXT != GL_REPLACE */
70      legal = GL_TRUE;
71      break;
72   case GL_COMBINE4_NV:
73      legal = ctx->Extensions.NV_texture_env_combine4;
74      break;
75   default:
76      legal = GL_FALSE;
77   }
78
79   if (legal) {
80      FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
81      texUnit->EnvMode = mode;
82   }
83   else {
84      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
85   }
86}
87
88
89static void
90set_env_color(struct gl_context *ctx,
91              struct gl_fixedfunc_texture_unit *texUnit,
92              const GLfloat *color)
93{
94   if (TEST_EQ_4V(color, texUnit->EnvColorUnclamped))
95      return;
96   FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
97   COPY_4FV(texUnit->EnvColorUnclamped, color);
98   texUnit->EnvColor[0] = CLAMP(color[0], 0.0F, 1.0F);
99   texUnit->EnvColor[1] = CLAMP(color[1], 0.0F, 1.0F);
100   texUnit->EnvColor[2] = CLAMP(color[2], 0.0F, 1.0F);
101   texUnit->EnvColor[3] = CLAMP(color[3], 0.0F, 1.0F);
102}
103
104
105/** Set an RGB or A combiner mode/function */
106static bool
107set_combiner_mode(struct gl_context *ctx,
108                  struct gl_fixedfunc_texture_unit *texUnit,
109                  GLenum pname, GLenum mode)
110{
111   GLboolean legal;
112
113   switch (mode) {
114   case GL_REPLACE:
115   case GL_MODULATE:
116   case GL_ADD:
117   case GL_ADD_SIGNED:
118   case GL_INTERPOLATE:
119      legal = GL_TRUE;
120      break;
121   case GL_SUBTRACT:
122      legal = ctx->Extensions.ARB_texture_env_combine;
123      break;
124   case GL_DOT3_RGB_EXT:
125   case GL_DOT3_RGBA_EXT:
126      legal = (ctx->API == API_OPENGL_COMPAT &&
127               ctx->Extensions.EXT_texture_env_dot3 &&
128               pname == GL_COMBINE_RGB);
129      break;
130   case GL_DOT3_RGB:
131   case GL_DOT3_RGBA:
132      legal = (ctx->Extensions.ARB_texture_env_dot3 &&
133               pname == GL_COMBINE_RGB);
134      break;
135   case GL_MODULATE_ADD_ATI:
136   case GL_MODULATE_SIGNED_ADD_ATI:
137   case GL_MODULATE_SUBTRACT_ATI:
138      legal = (ctx->API == API_OPENGL_COMPAT &&
139               ctx->Extensions.ATI_texture_env_combine3);
140      break;
141   default:
142      legal = GL_FALSE;
143   }
144
145   if (!legal) {
146      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
147      return false;
148   }
149
150   switch (pname) {
151   case GL_COMBINE_RGB:
152      if (texUnit->Combine.ModeRGB == mode)
153         return true;
154      FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
155      texUnit->Combine.ModeRGB = mode;
156      break;
157
158   case GL_COMBINE_ALPHA:
159      if (texUnit->Combine.ModeA == mode)
160         return true;
161      FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
162      texUnit->Combine.ModeA = mode;
163      break;
164   default:
165      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
166      return false;
167   }
168
169   return true;
170}
171
172
173
174/** Set an RGB or A combiner source term */
175static bool
176set_combiner_source(struct gl_context *ctx,
177                    struct gl_fixedfunc_texture_unit *texUnit,
178                    GLenum pname, GLenum param)
179{
180   GLuint term;
181   GLboolean alpha, legal;
182
183   /*
184    * Translate pname to (term, alpha).
185    *
186    * The enums were given sequential values for a reason.
187    */
188   switch (pname) {
189   case GL_SOURCE0_RGB:
190   case GL_SOURCE1_RGB:
191   case GL_SOURCE2_RGB:
192   case GL_SOURCE3_RGB_NV:
193      term = pname - GL_SOURCE0_RGB;
194      alpha = GL_FALSE;
195      break;
196   case GL_SOURCE0_ALPHA:
197   case GL_SOURCE1_ALPHA:
198   case GL_SOURCE2_ALPHA:
199   case GL_SOURCE3_ALPHA_NV:
200      term = pname - GL_SOURCE0_ALPHA;
201      alpha = GL_TRUE;
202      break;
203   default:
204      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
205      return false;
206   }
207
208   if ((term == 3) && (ctx->API != API_OPENGL_COMPAT
209                       || !ctx->Extensions.NV_texture_env_combine4)) {
210      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
211      return false;
212   }
213
214   assert(term < MAX_COMBINER_TERMS);
215
216   /*
217    * Error-check param (the source term)
218    */
219   switch (param) {
220   case GL_TEXTURE:
221   case GL_CONSTANT:
222   case GL_PRIMARY_COLOR:
223   case GL_PREVIOUS:
224      legal = GL_TRUE;
225      break;
226   case GL_TEXTURE0:
227   case GL_TEXTURE1:
228   case GL_TEXTURE2:
229   case GL_TEXTURE3:
230   case GL_TEXTURE4:
231   case GL_TEXTURE5:
232   case GL_TEXTURE6:
233   case GL_TEXTURE7:
234      legal = (ctx->Extensions.ARB_texture_env_crossbar &&
235               param - GL_TEXTURE0 < ctx->Const.MaxTextureUnits);
236      break;
237   case GL_ZERO:
238      legal = (ctx->API == API_OPENGL_COMPAT &&
239               (ctx->Extensions.ATI_texture_env_combine3 ||
240                ctx->Extensions.NV_texture_env_combine4));
241      break;
242   case GL_ONE:
243      legal = (ctx->API == API_OPENGL_COMPAT &&
244               ctx->Extensions.ATI_texture_env_combine3);
245      break;
246   default:
247      legal = GL_FALSE;
248   }
249
250   if (!legal) {
251      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", param);
252      return false;
253   }
254
255   FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
256
257   if (alpha)
258      texUnit->Combine.SourceA[term] = param;
259   else
260      texUnit->Combine.SourceRGB[term] = param;
261
262   return true;
263}
264
265
266/** Set an RGB or A combiner operand term */
267static bool
268set_combiner_operand(struct gl_context *ctx,
269                     struct gl_fixedfunc_texture_unit *texUnit,
270                     GLenum pname, GLenum param)
271{
272   GLuint term;
273   GLboolean alpha, legal;
274
275   /* The enums were given sequential values for a reason.
276    */
277   switch (pname) {
278   case GL_OPERAND0_RGB:
279   case GL_OPERAND1_RGB:
280   case GL_OPERAND2_RGB:
281   case GL_OPERAND3_RGB_NV:
282      term = pname - GL_OPERAND0_RGB;
283      alpha = GL_FALSE;
284      break;
285   case GL_OPERAND0_ALPHA:
286   case GL_OPERAND1_ALPHA:
287   case GL_OPERAND2_ALPHA:
288   case GL_OPERAND3_ALPHA_NV:
289      term = pname - GL_OPERAND0_ALPHA;
290      alpha = GL_TRUE;
291      break;
292   default:
293      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
294      return false;
295   }
296
297   if ((term == 3) && (ctx->API != API_OPENGL_COMPAT
298                       || !ctx->Extensions.NV_texture_env_combine4)) {
299      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
300      return false;
301   }
302
303   assert(term < MAX_COMBINER_TERMS);
304
305   /*
306    * Error-check param (the source operand)
307    */
308   switch (param) {
309   case GL_SRC_COLOR:
310   case GL_ONE_MINUS_SRC_COLOR:
311      /* The color input can only be used with GL_OPERAND[01]_RGB in the EXT
312       * version.  In the ARB and NV versions and OpenGL ES 1.x they can be
313       * used for any RGB operand.
314       */
315      legal = !alpha
316	 && ((term < 2) || ctx->Extensions.ARB_texture_env_combine
317	     || ctx->Extensions.NV_texture_env_combine4);
318      break;
319   case GL_ONE_MINUS_SRC_ALPHA:
320      /* GL_ONE_MINUS_SRC_ALPHA can only be used with
321       * GL_OPERAND[01]_(RGB|ALPHA) in the EXT version.  In the ARB and NV
322       * versions and OpenGL ES 1.x it can be used for any operand.
323       */
324      legal = (term < 2) || ctx->Extensions.ARB_texture_env_combine
325	 || ctx->Extensions.NV_texture_env_combine4;
326      break;
327   case GL_SRC_ALPHA:
328      legal = GL_TRUE;
329      break;
330   default:
331      legal = GL_FALSE;
332   }
333
334   if (!legal) {
335      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", param);
336      return false;
337   }
338
339   FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
340
341   if (alpha)
342      texUnit->Combine.OperandA[term] = param;
343   else
344      texUnit->Combine.OperandRGB[term] = param;
345
346   return true;
347}
348
349
350static bool
351set_combiner_scale(struct gl_context *ctx,
352                   struct gl_fixedfunc_texture_unit *texUnit,
353                   GLenum pname, GLfloat scale)
354{
355   GLuint shift;
356
357   if (scale == 1.0F) {
358      shift = 0;
359   }
360   else if (scale == 2.0F) {
361      shift = 1;
362   }
363   else if (scale == 4.0F) {
364      shift = 2;
365   }
366   else {
367      _mesa_error( ctx, GL_INVALID_VALUE,
368                   "glTexEnv(GL_RGB_SCALE not 1, 2 or 4)" );
369      return false;
370   }
371
372   switch (pname) {
373   case GL_RGB_SCALE:
374      if (texUnit->Combine.ScaleShiftRGB == shift)
375         return true;
376      FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
377      texUnit->Combine.ScaleShiftRGB = shift;
378      break;
379   case GL_ALPHA_SCALE:
380      if (texUnit->Combine.ScaleShiftA == shift)
381         return true;
382      FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
383      texUnit->Combine.ScaleShiftA = shift;
384      break;
385   default:
386      TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
387      return false;
388   }
389
390   return true;
391}
392
393
394
395void GLAPIENTRY
396_mesa_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
397{
398   const GLint iparam0 = (GLint) param[0];
399   GLuint maxUnit;
400   GET_CURRENT_CONTEXT(ctx);
401
402   maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
403      ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
404   if (ctx->Texture.CurrentUnit >= maxUnit) {
405      _mesa_error(ctx, GL_INVALID_OPERATION, "glTexEnvfv(current unit)");
406      return;
407   }
408
409   if (target == GL_TEXTURE_ENV) {
410      struct gl_fixedfunc_texture_unit *texUnit =
411         _mesa_get_current_fixedfunc_tex_unit(ctx);
412
413      /* The GL spec says that we should report an error if the unit is greater
414       * than GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, but in practice, only
415       * fixed-function units are usable. This is probably a spec bug.
416       * Ignore glTexEnv(GL_TEXTURE_ENV) calls for non-fixed-func units,
417       * because we don't want to process calls that have no effect.
418       */
419      if (!texUnit)
420         return;
421
422      switch (pname) {
423      case GL_TEXTURE_ENV_MODE:
424         set_env_mode(ctx, texUnit, (GLenum) iparam0);
425         break;
426      case GL_TEXTURE_ENV_COLOR:
427         set_env_color(ctx, texUnit, param);
428         break;
429      case GL_COMBINE_RGB:
430      case GL_COMBINE_ALPHA:
431         if (!set_combiner_mode(ctx, texUnit, pname, (GLenum) iparam0))
432            return;
433	 break;
434      case GL_SOURCE0_RGB:
435      case GL_SOURCE1_RGB:
436      case GL_SOURCE2_RGB:
437      case GL_SOURCE3_RGB_NV:
438      case GL_SOURCE0_ALPHA:
439      case GL_SOURCE1_ALPHA:
440      case GL_SOURCE2_ALPHA:
441      case GL_SOURCE3_ALPHA_NV:
442         if (!set_combiner_source(ctx, texUnit, pname, (GLenum) iparam0))
443            return;
444	 break;
445      case GL_OPERAND0_RGB:
446      case GL_OPERAND1_RGB:
447      case GL_OPERAND2_RGB:
448      case GL_OPERAND3_RGB_NV:
449      case GL_OPERAND0_ALPHA:
450      case GL_OPERAND1_ALPHA:
451      case GL_OPERAND2_ALPHA:
452      case GL_OPERAND3_ALPHA_NV:
453         if (!set_combiner_operand(ctx, texUnit, pname, (GLenum) iparam0))
454            return;
455	 break;
456      case GL_RGB_SCALE:
457      case GL_ALPHA_SCALE:
458         if (!set_combiner_scale(ctx, texUnit, pname, param[0]))
459            return;
460	 break;
461      default:
462	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
463	 return;
464      }
465   }
466   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
467      struct gl_texture_unit *texUnit =
468         _mesa_get_current_tex_unit(ctx);
469
470      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
471	 if (texUnit->LodBias == param[0])
472	    return;
473	 FLUSH_VERTICES(ctx, _NEW_TEXTURE_OBJECT);
474         texUnit->LodBias = param[0];
475      }
476      else {
477         TE_ERROR(GL_INVALID_ENUM, "glTexEnv(pname=%s)", pname);
478	 return;
479      }
480   }
481   else if (target == GL_POINT_SPRITE_NV) {
482      /* GL_ARB_point_sprite / GL_NV_point_sprite */
483      if (!ctx->Extensions.NV_point_sprite
484	  && !ctx->Extensions.ARB_point_sprite) {
485	 _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(target=0x%x)", target );
486	 return;
487      }
488      if (pname == GL_COORD_REPLACE_NV) {
489         /* It's kind of weird to set point state via glTexEnv,
490          * but that's what the spec calls for.
491          */
492         if (iparam0 == GL_TRUE) {
493            if (ctx->Point.CoordReplace & (1u << ctx->Texture.CurrentUnit))
494               return;
495            ctx->Point.CoordReplace |= (1u << ctx->Texture.CurrentUnit);
496         } else if (iparam0 == GL_FALSE) {
497            if (~(ctx->Point.CoordReplace) & (1u << ctx->Texture.CurrentUnit))
498               return;
499            ctx->Point.CoordReplace &= ~(1u << ctx->Texture.CurrentUnit);
500         } else {
501            _mesa_error( ctx, GL_INVALID_VALUE, "glTexEnv(param=0x%x)", iparam0);
502            return;
503         }
504         FLUSH_VERTICES(ctx, _NEW_POINT);
505      }
506      else {
507         _mesa_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname=0x%x)", pname );
508         return;
509      }
510   }
511   else {
512      _mesa_error(ctx, GL_INVALID_ENUM, "glTexEnv(target=%s)",
513                  _mesa_enum_to_string(target));
514      return;
515   }
516
517   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
518      _mesa_debug(ctx, "glTexEnv %s %s %.1f(%s) ...\n",
519                  _mesa_enum_to_string(target),
520                  _mesa_enum_to_string(pname),
521                  *param,
522                  _mesa_enum_to_string((GLenum) iparam0));
523
524   /* Tell device driver about the new texture environment */
525   if (ctx->Driver.TexEnv) {
526      ctx->Driver.TexEnv(ctx, target, pname, param);
527   }
528}
529
530
531void GLAPIENTRY
532_mesa_TexEnvf( GLenum target, GLenum pname, GLfloat param )
533{
534   GLfloat p[4];
535   p[0] = param;
536   p[1] = p[2] = p[3] = 0.0;
537   _mesa_TexEnvfv( target, pname, p );
538}
539
540
541
542void GLAPIENTRY
543_mesa_TexEnvi( GLenum target, GLenum pname, GLint param )
544{
545   GLfloat p[4];
546   p[0] = (GLfloat) param;
547   p[1] = p[2] = p[3] = 0.0;
548   _mesa_TexEnvfv( target, pname, p );
549}
550
551
552void GLAPIENTRY
553_mesa_TexEnviv( GLenum target, GLenum pname, const GLint *param )
554{
555   GLfloat p[4];
556   if (pname == GL_TEXTURE_ENV_COLOR) {
557      p[0] = INT_TO_FLOAT( param[0] );
558      p[1] = INT_TO_FLOAT( param[1] );
559      p[2] = INT_TO_FLOAT( param[2] );
560      p[3] = INT_TO_FLOAT( param[3] );
561   }
562   else {
563      p[0] = (GLfloat) param[0];
564      p[1] = p[2] = p[3] = 0;  /* init to zero, just to be safe */
565   }
566   _mesa_TexEnvfv( target, pname, p );
567}
568
569
570
571/**
572 * Helper for glGetTexEnvi/f()
573 * \return  value of queried pname or -1 if error.
574 */
575static GLint
576get_texenvi(struct gl_context *ctx,
577            const struct gl_fixedfunc_texture_unit *texUnit,
578            GLenum pname)
579{
580   switch (pname) {
581   case GL_TEXTURE_ENV_MODE:
582      return texUnit->EnvMode;
583      break;
584   case GL_COMBINE_RGB:
585      return texUnit->Combine.ModeRGB;
586   case GL_COMBINE_ALPHA:
587      return texUnit->Combine.ModeA;
588   case GL_SOURCE0_RGB:
589   case GL_SOURCE1_RGB:
590   case GL_SOURCE2_RGB: {
591      const unsigned rgb_idx = pname - GL_SOURCE0_RGB;
592      return texUnit->Combine.SourceRGB[rgb_idx];
593   }
594   case GL_SOURCE3_RGB_NV:
595      if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
596         return texUnit->Combine.SourceRGB[3];
597      }
598      else {
599         _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
600      }
601      break;
602   case GL_SOURCE0_ALPHA:
603   case GL_SOURCE1_ALPHA:
604   case GL_SOURCE2_ALPHA: {
605      const unsigned alpha_idx = pname - GL_SOURCE0_ALPHA;
606      return texUnit->Combine.SourceA[alpha_idx];
607   }
608   case GL_SOURCE3_ALPHA_NV:
609      if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
610         return texUnit->Combine.SourceA[3];
611      }
612      else {
613         _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
614      }
615      break;
616   case GL_OPERAND0_RGB:
617   case GL_OPERAND1_RGB:
618   case GL_OPERAND2_RGB: {
619      const unsigned op_rgb = pname - GL_OPERAND0_RGB;
620      return texUnit->Combine.OperandRGB[op_rgb];
621   }
622   case GL_OPERAND3_RGB_NV:
623      if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
624         return texUnit->Combine.OperandRGB[3];
625      }
626      else {
627         _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
628      }
629      break;
630   case GL_OPERAND0_ALPHA:
631   case GL_OPERAND1_ALPHA:
632   case GL_OPERAND2_ALPHA: {
633      const unsigned op_alpha = pname - GL_OPERAND0_ALPHA;
634      return texUnit->Combine.OperandA[op_alpha];
635   }
636   case GL_OPERAND3_ALPHA_NV:
637      if (ctx->API == API_OPENGL_COMPAT && ctx->Extensions.NV_texture_env_combine4) {
638         return texUnit->Combine.OperandA[3];
639      }
640      else {
641         _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
642      }
643      break;
644   case GL_RGB_SCALE:
645      return 1 << texUnit->Combine.ScaleShiftRGB;
646   case GL_ALPHA_SCALE:
647      return 1 << texUnit->Combine.ScaleShiftA;
648   default:
649      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)");
650      break;
651   }
652
653   return -1; /* error */
654}
655
656
657
658void GLAPIENTRY
659_mesa_GetTexEnvfv( GLenum target, GLenum pname, GLfloat *params )
660{
661   GLuint maxUnit;
662   GET_CURRENT_CONTEXT(ctx);
663
664   maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
665      ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
666   if (ctx->Texture.CurrentUnit >= maxUnit) {
667      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnvfv(current unit)");
668      return;
669   }
670
671   if (target == GL_TEXTURE_ENV) {
672      struct gl_fixedfunc_texture_unit *texUnit =
673         _mesa_get_current_fixedfunc_tex_unit(ctx);
674
675      /* The GL spec says that we should report an error if the unit is greater
676       * than GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, but in practice, only
677       * fixed-function units are usable. This is probably a spec bug.
678       * Ignore calls for non-fixed-func units, because we don't process
679       * glTexEnv for them either.
680       */
681      if (!texUnit)
682         return;
683
684      if (pname == GL_TEXTURE_ENV_COLOR) {
685         if(ctx->NewState & (_NEW_BUFFERS | _NEW_FRAG_CLAMP))
686            _mesa_update_state(ctx);
687         if (_mesa_get_clamp_fragment_color(ctx, ctx->DrawBuffer))
688            COPY_4FV( params, texUnit->EnvColor );
689         else
690            COPY_4FV( params, texUnit->EnvColorUnclamped );
691      }
692      else {
693         GLint val = get_texenvi(ctx, texUnit, pname);
694         if (val >= 0) {
695            *params = (GLfloat) val;
696         }
697      }
698   }
699   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
700      const struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
701
702      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
703         *params = texUnit->LodBias;
704      }
705      else {
706         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
707	 return;
708      }
709   }
710   else if (target == GL_POINT_SPRITE_NV) {
711      /* GL_ARB_point_sprite / GL_NV_point_sprite */
712      if (!ctx->Extensions.NV_point_sprite
713	  && !ctx->Extensions.ARB_point_sprite) {
714         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
715         return;
716      }
717      if (pname == GL_COORD_REPLACE_NV) {
718         if (ctx->Point.CoordReplace & (1u << ctx->Texture.CurrentUnit))
719            *params = 1.0f;
720         else
721            *params = 0.0f;
722      }
723      else {
724         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(pname)" );
725         return;
726      }
727   }
728   else {
729      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnvfv(target)" );
730      return;
731   }
732}
733
734
735void GLAPIENTRY
736_mesa_GetTexEnviv( GLenum target, GLenum pname, GLint *params )
737{
738   GLuint maxUnit;
739   GET_CURRENT_CONTEXT(ctx);
740
741   maxUnit = (target == GL_POINT_SPRITE_NV && pname == GL_COORD_REPLACE_NV)
742      ? ctx->Const.MaxTextureCoordUnits : ctx->Const.MaxCombinedTextureImageUnits;
743   if (ctx->Texture.CurrentUnit >= maxUnit) {
744      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetTexEnviv(current unit)");
745      return;
746   }
747
748   if (target == GL_TEXTURE_ENV) {
749      struct gl_fixedfunc_texture_unit *texUnit =
750         _mesa_get_current_fixedfunc_tex_unit(ctx);
751
752      /* The GL spec says that we should report an error if the unit is greater
753       * than GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, but in practice, only
754       * fixed-function units are usable. This is probably a spec bug.
755       * Ignore calls for non-fixed-func units, because we don't process
756       * glTexEnv for them either.
757       */
758      if (!texUnit)
759         return;
760
761      if (pname == GL_TEXTURE_ENV_COLOR) {
762         params[0] = FLOAT_TO_INT( texUnit->EnvColor[0] );
763         params[1] = FLOAT_TO_INT( texUnit->EnvColor[1] );
764         params[2] = FLOAT_TO_INT( texUnit->EnvColor[2] );
765         params[3] = FLOAT_TO_INT( texUnit->EnvColor[3] );
766      }
767      else {
768         GLint val = get_texenvi(ctx, texUnit, pname);
769         if (val >= 0) {
770            *params = val;
771         }
772      }
773   }
774   else if (target == GL_TEXTURE_FILTER_CONTROL_EXT) {
775      const struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
776
777      if (pname == GL_TEXTURE_LOD_BIAS_EXT) {
778         *params = (GLint) texUnit->LodBias;
779      }
780      else {
781         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
782	 return;
783      }
784   }
785   else if (target == GL_POINT_SPRITE_NV) {
786      /* GL_ARB_point_sprite / GL_NV_point_sprite */
787      if (!ctx->Extensions.NV_point_sprite
788	  && !ctx->Extensions.ARB_point_sprite) {
789         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
790         return;
791      }
792      if (pname == GL_COORD_REPLACE_NV) {
793         if (ctx->Point.CoordReplace & (1u << ctx->Texture.CurrentUnit))
794            *params = GL_TRUE;
795         else
796            *params = GL_FALSE;
797      }
798      else {
799         _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(pname)" );
800         return;
801      }
802   }
803   else {
804      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexEnviv(target)" );
805      return;
806   }
807}
808
809