7 * Mesa 3-D graphics library
10 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
12 * Permission is hereby granted, free of charge, to any person obtaining a
13 * copy of this software and associated documentation files (the "Software"),
14 * to deal in the Software without restriction, including without limitation
15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
16 * and/or sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following conditions:
19 * The above copyright notice and this permission notice shall be included
20 * in all copies or substantial portions of the Software.
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
23 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
26 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
27 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
42 * Check if given blend source factor is legal.
43 * \return GL_TRUE if legal, GL_FALSE otherwise.
46 legal_src_factor(const struct gl_context *ctx, GLenum factor)
50 case GL_ONE_MINUS_SRC_COLOR:
51 return ctx->Extensions.NV_blend_square;
55 case GL_ONE_MINUS_DST_COLOR:
57 case GL_ONE_MINUS_SRC_ALPHA:
59 case GL_ONE_MINUS_DST_ALPHA:
60 case GL_SRC_ALPHA_SATURATE:
62 case GL_CONSTANT_COLOR:
63 case GL_ONE_MINUS_CONSTANT_COLOR:
64 case GL_CONSTANT_ALPHA:
65 case GL_ONE_MINUS_CONSTANT_ALPHA:
66 return _mesa_is_desktop_gl(ctx) || ctx->API == API_OPENGLES2;
69 case GL_ONE_MINUS_SRC1_COLOR:
70 case GL_ONE_MINUS_SRC1_ALPHA:
71 return _mesa_is_desktop_gl(ctx)
72 && ctx->Extensions.ARB_blend_func_extended;
80 * Check if given blend destination factor is legal.
81 * \return GL_TRUE if legal, GL_FALSE otherwise.
84 legal_dst_factor(const struct gl_context *ctx, GLenum factor)
88 case GL_ONE_MINUS_DST_COLOR:
89 return ctx->Extensions.NV_blend_square;
93 case GL_ONE_MINUS_SRC_COLOR:
95 case GL_ONE_MINUS_SRC_ALPHA:
97 case GL_ONE_MINUS_DST_ALPHA:
99 case GL_CONSTANT_COLOR:
100 case GL_ONE_MINUS_CONSTANT_COLOR:
101 case GL_CONSTANT_ALPHA:
102 case GL_ONE_MINUS_CONSTANT_ALPHA:
103 return _mesa_is_desktop_gl(ctx) || ctx->API == API_OPENGLES2;
104 case GL_SRC_ALPHA_SATURATE:
105 return (_mesa_is_desktop_gl(ctx)
106 && ctx->Extensions.ARB_blend_func_extended)
107 || _mesa_is_gles3(ctx);
110 case GL_ONE_MINUS_SRC1_COLOR:
111 case GL_ONE_MINUS_SRC1_ALPHA:
112 return _mesa_is_desktop_gl(ctx)
113 && ctx->Extensions.ARB_blend_func_extended;
121 * Check if src/dest RGB/A blend factors are legal. If not generate
123 * \return GL_TRUE if factors are legal, GL_FALSE otherwise.
126 validate_blend_factors(struct gl_context *ctx, const char *func,
127 GLenum sfactorRGB, GLenum dfactorRGB,
128 GLenum sfactorA, GLenum dfactorA)
130 if (!legal_src_factor(ctx, sfactorRGB)) {
131 _mesa_error(ctx, GL_INVALID_ENUM,
132 "%s(sfactorRGB = %s)", func,
133 _mesa_lookup_enum_by_nr(sfactorRGB));
137 if (!legal_dst_factor(ctx, dfactorRGB)) {
138 _mesa_error(ctx, GL_INVALID_ENUM,
139 "%s(dfactorRGB = %s)", func,
140 _mesa_lookup_enum_by_nr(dfactorRGB));
144 if (sfactorA != sfactorRGB && !legal_src_factor(ctx, sfactorA)) {
145 _mesa_error(ctx, GL_INVALID_ENUM,
146 "%s(sfactorA = %s)", func,
147 _mesa_lookup_enum_by_nr(sfactorA));
151 if (dfactorA != dfactorRGB && !legal_dst_factor(ctx, dfactorA)) {
152 _mesa_error(ctx, GL_INVALID_ENUM,
153 "%s(dfactorA = %s)", func,
154 _mesa_lookup_enum_by_nr(dfactorA));
163 * Specify the blending operation.
165 * \param sfactor source factor operator.
166 * \param dfactor destination factor operator.
168 * \sa glBlendFunc, glBlendFuncSeparateEXT
171 _mesa_BlendFunc( GLenum sfactor, GLenum dfactor )
173 _mesa_BlendFuncSeparate(sfactor, dfactor, sfactor, dfactor);
177 blend_factor_is_dual_src(GLenum factor)
179 return (factor == GL_SRC1_COLOR ||
180 factor == GL_SRC1_ALPHA ||
181 factor == GL_ONE_MINUS_SRC1_COLOR ||
182 factor == GL_ONE_MINUS_SRC1_ALPHA);
186 update_uses_dual_src(struct gl_context *ctx, int buf)
188 ctx->Color.Blend[buf]._UsesDualSrc =
189 (blend_factor_is_dual_src(ctx->Color.Blend[buf].SrcRGB) ||
190 blend_factor_is_dual_src(ctx->Color.Blend[buf].DstRGB) ||
191 blend_factor_is_dual_src(ctx->Color.Blend[buf].SrcA) ||
192 blend_factor_is_dual_src(ctx->Color.Blend[buf].DstA));
196 * Set the separate blend source/dest factors for all draw buffers.
198 * \param sfactorRGB RGB source factor operator.
199 * \param dfactorRGB RGB destination factor operator.
200 * \param sfactorA alpha source factor operator.
201 * \param dfactorA alpha destination factor operator.
204 _mesa_BlendFuncSeparate( GLenum sfactorRGB, GLenum dfactorRGB,
205 GLenum sfactorA, GLenum dfactorA )
207 GLuint buf, numBuffers;
209 GET_CURRENT_CONTEXT(ctx);
211 if (MESA_VERBOSE & VERBOSE_API)
212 _mesa_debug(ctx, "glBlendFuncSeparate %s %s %s %s\n",
213 _mesa_lookup_enum_by_nr(sfactorRGB),
214 _mesa_lookup_enum_by_nr(dfactorRGB),
215 _mesa_lookup_enum_by_nr(sfactorA),
216 _mesa_lookup_enum_by_nr(dfactorA));
218 if (!validate_blend_factors(ctx, "glBlendFuncSeparate",
219 sfactorRGB, dfactorRGB,
220 sfactorA, dfactorA)) {
224 numBuffers = ctx->Extensions.ARB_draw_buffers_blend
225 ? ctx->Const.MaxDrawBuffers : 1;
228 for (buf = 0; buf < numBuffers; buf++) {
229 if (ctx->Color.Blend[buf].SrcRGB != sfactorRGB ||
230 ctx->Color.Blend[buf].DstRGB != dfactorRGB ||
231 ctx->Color.Blend[buf].SrcA != sfactorA ||
232 ctx->Color.Blend[buf].DstA != dfactorA) {
240 FLUSH_VERTICES(ctx, _NEW_COLOR);
242 for (buf = 0; buf < numBuffers; buf++) {
243 ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
244 ctx->Color.Blend[buf].DstRGB = dfactorRGB;
245 ctx->Color.Blend[buf].SrcA = sfactorA;
246 ctx->Color.Blend[buf].DstA = dfactorA;
247 update_uses_dual_src(ctx, buf);
249 ctx->Color._BlendFuncPerBuffer = GL_FALSE;
251 if (ctx->Driver.BlendFuncSeparate) {
252 ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB,
259 * Set blend source/dest factors for one color buffer/target.
262 _mesa_BlendFunciARB(GLuint buf, GLenum sfactor, GLenum dfactor)
264 _mesa_BlendFuncSeparateiARB(buf, sfactor, dfactor, sfactor, dfactor);
269 * Set separate blend source/dest factors for one color buffer/target.
272 _mesa_BlendFuncSeparateiARB(GLuint buf, GLenum sfactorRGB, GLenum dfactorRGB,
273 GLenum sfactorA, GLenum dfactorA)
275 GET_CURRENT_CONTEXT(ctx);
277 if (!ctx->Extensions.ARB_draw_buffers_blend) {
278 _mesa_error(ctx, GL_INVALID_OPERATION, "glBlendFunc[Separate]i()");
282 if (buf >= ctx->Const.MaxDrawBuffers) {
283 _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
288 if (!validate_blend_factors(ctx, "glBlendFuncSeparatei",
289 sfactorRGB, dfactorRGB,
290 sfactorA, dfactorA)) {
294 if (ctx->Color.Blend[buf].SrcRGB == sfactorRGB &&
295 ctx->Color.Blend[buf].DstRGB == dfactorRGB &&
296 ctx->Color.Blend[buf].SrcA == sfactorA &&
297 ctx->Color.Blend[buf].DstA == dfactorA)
298 return; /* no change */
300 FLUSH_VERTICES(ctx, _NEW_COLOR);
302 ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
303 ctx->Color.Blend[buf].DstRGB = dfactorRGB;
304 ctx->Color.Blend[buf].SrcA = sfactorA;
305 ctx->Color.Blend[buf].DstA = dfactorA;
306 update_uses_dual_src(ctx, buf);
307 ctx->Color._BlendFuncPerBuffer = GL_TRUE;
309 if (ctx->Driver.BlendFuncSeparatei) {
310 ctx->Driver.BlendFuncSeparatei(ctx, buf, sfactorRGB, dfactorRGB,
317 * Check if given blend equation is legal.
318 * \return GL_TRUE if legal, GL_FALSE otherwise.
321 legal_blend_equation(const struct gl_context *ctx, GLenum mode)
325 case GL_FUNC_SUBTRACT:
326 case GL_FUNC_REVERSE_SUBTRACT:
330 return ctx->Extensions.EXT_blend_minmax;
337 /* This is really an extension function! */
339 _mesa_BlendEquation( GLenum mode )
341 GLuint buf, numBuffers;
343 GET_CURRENT_CONTEXT(ctx);
345 if (MESA_VERBOSE & VERBOSE_API)
346 _mesa_debug(ctx, "glBlendEquation(%s)\n",
347 _mesa_lookup_enum_by_nr(mode));
349 if (!legal_blend_equation(ctx, mode)) {
350 _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
354 numBuffers = ctx->Extensions.ARB_draw_buffers_blend
355 ? ctx->Const.MaxDrawBuffers : 1;
358 for (buf = 0; buf < numBuffers; buf++) {
359 if (ctx->Color.Blend[buf].EquationRGB != mode ||
360 ctx->Color.Blend[buf].EquationA != mode) {
368 FLUSH_VERTICES(ctx, _NEW_COLOR);
369 for (buf = 0; buf < numBuffers; buf++) {
370 ctx->Color.Blend[buf].EquationRGB = mode;
371 ctx->Color.Blend[buf].EquationA = mode;
373 ctx->Color._BlendEquationPerBuffer = GL_FALSE;
375 if (ctx->Driver.BlendEquationSeparate)
376 (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode );
381 * Set blend equation for one color buffer/target.
384 _mesa_BlendEquationiARB(GLuint buf, GLenum mode)
386 GET_CURRENT_CONTEXT(ctx);
388 if (MESA_VERBOSE & VERBOSE_API)
389 _mesa_debug(ctx, "glBlendEquationi(%u, %s)\n",
390 buf, _mesa_lookup_enum_by_nr(mode));
392 if (buf >= ctx->Const.MaxDrawBuffers) {
393 _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
398 if (!legal_blend_equation(ctx, mode)) {
399 _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationi");
403 if (ctx->Color.Blend[buf].EquationRGB == mode &&
404 ctx->Color.Blend[buf].EquationA == mode)
405 return; /* no change */
407 FLUSH_VERTICES(ctx, _NEW_COLOR);
408 ctx->Color.Blend[buf].EquationRGB = mode;
409 ctx->Color.Blend[buf].EquationA = mode;
410 ctx->Color._BlendEquationPerBuffer = GL_TRUE;
412 if (ctx->Driver.BlendEquationSeparatei)
413 ctx->Driver.BlendEquationSeparatei(ctx, buf, mode, mode);
418 _mesa_BlendEquationSeparate( GLenum modeRGB, GLenum modeA )
420 GLuint buf, numBuffers;
422 GET_CURRENT_CONTEXT(ctx);
424 if (MESA_VERBOSE & VERBOSE_API)
425 _mesa_debug(ctx, "glBlendEquationSeparateEXT(%s %s)\n",
426 _mesa_lookup_enum_by_nr(modeRGB),
427 _mesa_lookup_enum_by_nr(modeA));
429 if ( (modeRGB != modeA) && !ctx->Extensions.EXT_blend_equation_separate ) {
430 _mesa_error(ctx, GL_INVALID_OPERATION,
431 "glBlendEquationSeparateEXT not supported by driver");
435 if (!legal_blend_equation(ctx, modeRGB)) {
436 _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)");
440 if (!legal_blend_equation(ctx, modeA)) {
441 _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeA)");
445 numBuffers = ctx->Extensions.ARB_draw_buffers_blend
446 ? ctx->Const.MaxDrawBuffers : 1;
449 for (buf = 0; buf < numBuffers; buf++) {
450 if (ctx->Color.Blend[buf].EquationRGB != modeRGB ||
451 ctx->Color.Blend[buf].EquationA != modeA) {
459 FLUSH_VERTICES(ctx, _NEW_COLOR);
460 for (buf = 0; buf < numBuffers; buf++) {
461 ctx->Color.Blend[buf].EquationRGB = modeRGB;
462 ctx->Color.Blend[buf].EquationA = modeA;
464 ctx->Color._BlendEquationPerBuffer = GL_FALSE;
466 if (ctx->Driver.BlendEquationSeparate)
467 ctx->Driver.BlendEquationSeparate(ctx, modeRGB, modeA);
472 * Set separate blend equations for one color buffer/target.
475 _mesa_BlendEquationSeparateiARB(GLuint buf, GLenum modeRGB, GLenum modeA)
477 GET_CURRENT_CONTEXT(ctx);
479 if (MESA_VERBOSE & VERBOSE_API)
480 _mesa_debug(ctx, "glBlendEquationSeparatei(%u, %s %s)\n", buf,
481 _mesa_lookup_enum_by_nr(modeRGB),
482 _mesa_lookup_enum_by_nr(modeA));
484 if (buf >= ctx->Const.MaxDrawBuffers) {
485 _mesa_error(ctx, GL_INVALID_VALUE, "glBlendEquationSeparatei(buffer=%u)",
490 if (!legal_blend_equation(ctx, modeRGB)) {
491 _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)");
495 if (!legal_blend_equation(ctx, modeA)) {
496 _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeA)");
500 if (ctx->Color.Blend[buf].EquationRGB == modeRGB &&
501 ctx->Color.Blend[buf].EquationA == modeA)
502 return; /* no change */
504 FLUSH_VERTICES(ctx, _NEW_COLOR);
505 ctx->Color.Blend[buf].EquationRGB = modeRGB;
506 ctx->Color.Blend[buf].EquationA = modeA;
507 ctx->Color._BlendEquationPerBuffer = GL_TRUE;
509 if (ctx->Driver.BlendEquationSeparatei)
510 ctx->Driver.BlendEquationSeparatei(ctx, buf, modeRGB, modeA);
515 * Set the blending color.
517 * \param red red color component.
518 * \param green green color component.
519 * \param blue blue color component.
520 * \param alpha alpha color component.
522 * \sa glBlendColor().
524 * Clamps the parameters and updates gl_colorbuffer_attrib::BlendColor. On a
525 * change, flushes the vertices and notifies the driver via
526 * dd_function_table::BlendColor callback.
529 _mesa_BlendColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
532 GET_CURRENT_CONTEXT(ctx);
539 if (TEST_EQ_4V(tmp, ctx->Color.BlendColorUnclamped))
542 FLUSH_VERTICES(ctx, _NEW_COLOR);
543 COPY_4FV( ctx->Color.BlendColorUnclamped, tmp );
545 ctx->Color.BlendColor[0] = CLAMP(tmp[0], 0.0F, 1.0F);
546 ctx->Color.BlendColor[1] = CLAMP(tmp[1], 0.0F, 1.0F);
547 ctx->Color.BlendColor[2] = CLAMP(tmp[2], 0.0F, 1.0F);
548 ctx->Color.BlendColor[3] = CLAMP(tmp[3], 0.0F, 1.0F);
550 if (ctx->Driver.BlendColor)
551 (*ctx->Driver.BlendColor)(ctx, ctx->Color.BlendColor);
556 * Specify the alpha test function.
558 * \param func alpha comparison function.
559 * \param ref reference value.
561 * Verifies the parameters and updates gl_colorbuffer_attrib.
562 * On a change, flushes the vertices and notifies the driver via
563 * dd_function_table::AlphaFunc callback.
566 _mesa_AlphaFunc( GLenum func, GLclampf ref )
568 GET_CURRENT_CONTEXT(ctx);
570 if (MESA_VERBOSE & VERBOSE_API)
571 _mesa_debug(ctx, "glAlphaFunc(%s, %f)\n",
572 _mesa_lookup_enum_by_nr(func), ref);
583 if (ctx->Color.AlphaFunc == func && ctx->Color.AlphaRefUnclamped == ref)
584 return; /* no change */
586 FLUSH_VERTICES(ctx, _NEW_COLOR);
587 ctx->Color.AlphaFunc = func;
588 ctx->Color.AlphaRefUnclamped = ref;
589 ctx->Color.AlphaRef = CLAMP(ref, 0.0F, 1.0F);
591 if (ctx->Driver.AlphaFunc)
592 ctx->Driver.AlphaFunc(ctx, func, ctx->Color.AlphaRef);
596 _mesa_error( ctx, GL_INVALID_ENUM, "glAlphaFunc(func)" );
603 * Specify a logic pixel operation for color index rendering.
605 * \param opcode operation.
607 * Verifies that \p opcode is a valid enum and updates
608 gl_colorbuffer_attrib::LogicOp.
609 * On a change, flushes the vertices and notifies the driver via the
610 * dd_function_table::LogicOpcode callback.
613 _mesa_LogicOp( GLenum opcode )
615 GET_CURRENT_CONTEXT(ctx);
617 if (MESA_VERBOSE & VERBOSE_API)
618 _mesa_debug(ctx, "glLogicOp(%s)\n", _mesa_lookup_enum_by_nr(opcode));
624 case GL_COPY_INVERTED:
634 case GL_AND_INVERTED:
639 _mesa_error( ctx, GL_INVALID_ENUM, "glLogicOp" );
643 if (ctx->Color.LogicOp == opcode)
646 FLUSH_VERTICES(ctx, _NEW_COLOR);
647 ctx->Color.LogicOp = opcode;
649 if (ctx->Driver.LogicOpcode)
650 ctx->Driver.LogicOpcode( ctx, opcode );
655 _mesa_IndexMask( GLuint mask )
657 GET_CURRENT_CONTEXT(ctx);
659 if (ctx->Color.IndexMask == mask)
662 FLUSH_VERTICES(ctx, _NEW_COLOR);
663 ctx->Color.IndexMask = mask;
668 * Enable or disable writing of frame buffer color components.
670 * \param red whether to mask writing of the red color component.
671 * \param green whether to mask writing of the green color component.
672 * \param blue whether to mask writing of the blue color component.
673 * \param alpha whether to mask writing of the alpha color component.
677 * Sets the appropriate value of gl_colorbuffer_attrib::ColorMask. On a
678 * change, flushes the vertices and notifies the driver via the
679 * dd_function_table::ColorMask callback.
682 _mesa_ColorMask( GLboolean red, GLboolean green,
683 GLboolean blue, GLboolean alpha )
685 GET_CURRENT_CONTEXT(ctx);
690 if (MESA_VERBOSE & VERBOSE_API)
691 _mesa_debug(ctx, "glColorMask(%d, %d, %d, %d)\n",
692 red, green, blue, alpha);
694 /* Shouldn't have any information about channel depth in core mesa
695 * -- should probably store these as the native booleans:
697 tmp[RCOMP] = red ? 0xff : 0x0;
698 tmp[GCOMP] = green ? 0xff : 0x0;
699 tmp[BCOMP] = blue ? 0xff : 0x0;
700 tmp[ACOMP] = alpha ? 0xff : 0x0;
703 for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
704 if (!TEST_EQ_4V(tmp, ctx->Color.ColorMask[i])) {
706 FLUSH_VERTICES(ctx, _NEW_COLOR);
709 COPY_4UBV(ctx->Color.ColorMask[i], tmp);
713 if (ctx->Driver.ColorMask)
714 ctx->Driver.ColorMask( ctx, red, green, blue, alpha );
719 * For GL_EXT_draw_buffers2 and GL3
722 _mesa_ColorMaski( GLuint buf, GLboolean red, GLboolean green,
723 GLboolean blue, GLboolean alpha )
726 GET_CURRENT_CONTEXT(ctx);
728 if (MESA_VERBOSE & VERBOSE_API)
729 _mesa_debug(ctx, "glColorMaskIndexed %u %d %d %d %d\n",
730 buf, red, green, blue, alpha);
732 if (buf >= ctx->Const.MaxDrawBuffers) {
733 _mesa_error(ctx, GL_INVALID_VALUE, "glColorMaskIndexed(buf=%u)", buf);
737 /* Shouldn't have any information about channel depth in core mesa
738 * -- should probably store these as the native booleans:
740 tmp[RCOMP] = red ? 0xff : 0x0;
741 tmp[GCOMP] = green ? 0xff : 0x0;
742 tmp[BCOMP] = blue ? 0xff : 0x0;
743 tmp[ACOMP] = alpha ? 0xff : 0x0;
745 if (TEST_EQ_4V(tmp, ctx->Color.ColorMask[buf]))
748 FLUSH_VERTICES(ctx, _NEW_COLOR);
749 COPY_4UBV(ctx->Color.ColorMask[buf], tmp);
751 if (ctx->Driver.ColorMaskIndexed)
752 ctx->Driver.ColorMaskIndexed(ctx, buf, red, green, blue, alpha);
757 _mesa_ClampColor(GLenum target, GLenum clamp)
759 GET_CURRENT_CONTEXT(ctx);
761 if (clamp != GL_TRUE && clamp != GL_FALSE && clamp != GL_FIXED_ONLY_ARB) {
762 _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(clamp)");
767 case GL_CLAMP_VERTEX_COLOR_ARB:
768 FLUSH_VERTICES(ctx, _NEW_LIGHT);
769 ctx->Light.ClampVertexColor = clamp;
770 _mesa_update_clamp_vertex_color(ctx);
772 case GL_CLAMP_FRAGMENT_COLOR_ARB:
773 FLUSH_VERTICES(ctx, _NEW_FRAG_CLAMP);
774 ctx->Color.ClampFragmentColor = clamp;
775 _mesa_update_clamp_fragment_color(ctx);
777 case GL_CLAMP_READ_COLOR_ARB:
778 FLUSH_VERTICES(ctx, _NEW_COLOR);
779 ctx->Color.ClampReadColor = clamp;
782 _mesa_error(ctx, GL_INVALID_ENUM, "glClampColorARB(target)");
788 get_clamp_color(const struct gl_framebuffer *fb, GLenum clamp)
790 if (clamp == GL_TRUE || clamp == GL_FALSE)
793 ASSERT(clamp == GL_FIXED_ONLY);
797 return fb->_AllColorBuffersFixedPoint;
801 _mesa_get_clamp_fragment_color(const struct gl_context *ctx)
803 return get_clamp_color(ctx->DrawBuffer,
804 ctx->Color.ClampFragmentColor);
808 _mesa_get_clamp_vertex_color(const struct gl_context *ctx)
810 return get_clamp_color(ctx->DrawBuffer, ctx->Light.ClampVertexColor);
814 _mesa_get_clamp_read_color(const struct gl_context *ctx)
816 return get_clamp_color(ctx->ReadBuffer, ctx->Color.ClampReadColor);
820 * Update the ctx->Color._ClampFragmentColor field
823 _mesa_update_clamp_fragment_color(struct gl_context *ctx)
825 struct gl_framebuffer *fb = ctx->DrawBuffer;
828 * - there is no colorbuffer
829 * - all colorbuffers are unsigned normalized, so clamping has no effect
830 * - there is an integer colorbuffer
832 if (!fb || !fb->_HasSNormOrFloatColorBuffer || fb->_IntegerColor)
833 ctx->Color._ClampFragmentColor = GL_FALSE;
835 ctx->Color._ClampFragmentColor = _mesa_get_clamp_fragment_color(ctx);
839 * Update the ctx->Color._ClampVertexColor field
842 _mesa_update_clamp_vertex_color(struct gl_context *ctx)
844 ctx->Light._ClampVertexColor = _mesa_get_clamp_vertex_color(ctx);
848 /**********************************************************************/
849 /** \name Initialization */
853 * Initialization of the context's Color attribute group.
855 * \param ctx GL context.
857 * Initializes the related fields in the context color attribute group,
858 * __struct gl_contextRec::Color.
860 void _mesa_init_color( struct gl_context * ctx )
864 /* Color buffer group */
865 ctx->Color.IndexMask = ~0u;
866 memset(ctx->Color.ColorMask, 0xff, sizeof(ctx->Color.ColorMask));
867 ctx->Color.ClearIndex = 0;
868 ASSIGN_4V( ctx->Color.ClearColor.f, 0, 0, 0, 0 );
869 ctx->Color.AlphaEnabled = GL_FALSE;
870 ctx->Color.AlphaFunc = GL_ALWAYS;
871 ctx->Color.AlphaRef = 0;
872 ctx->Color.BlendEnabled = 0x0;
873 for (i = 0; i < Elements(ctx->Color.Blend); i++) {
874 ctx->Color.Blend[i].SrcRGB = GL_ONE;
875 ctx->Color.Blend[i].DstRGB = GL_ZERO;
876 ctx->Color.Blend[i].SrcA = GL_ONE;
877 ctx->Color.Blend[i].DstA = GL_ZERO;
878 ctx->Color.Blend[i].EquationRGB = GL_FUNC_ADD;
879 ctx->Color.Blend[i].EquationA = GL_FUNC_ADD;
881 ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 );
882 ASSIGN_4V( ctx->Color.BlendColorUnclamped, 0.0, 0.0, 0.0, 0.0 );
883 ctx->Color.IndexLogicOpEnabled = GL_FALSE;
884 ctx->Color.ColorLogicOpEnabled = GL_FALSE;
885 ctx->Color.LogicOp = GL_COPY;
886 ctx->Color.DitherFlag = GL_TRUE;
888 if (ctx->Visual.doubleBufferMode) {
889 ctx->Color.DrawBuffer[0] = GL_BACK;
892 ctx->Color.DrawBuffer[0] = GL_FRONT;
895 ctx->Color.ClampFragmentColor = GL_FIXED_ONLY_ARB;
896 ctx->Color._ClampFragmentColor = GL_FALSE;
897 ctx->Color.ClampReadColor = GL_FIXED_ONLY_ARB;
899 if (ctx->API == API_OPENGLES2) {
900 /* GLES 3 behaves as though GL_FRAMEBUFFER_SRGB is always enabled. */
901 ctx->Color.sRGBEnabled = GL_TRUE;
903 ctx->Color.sRGBEnabled = GL_FALSE;