7 * Mesa 3-D graphics library
9 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice shall be included
19 * in all copies or substantial portions of the Software.
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
22 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
25 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
26 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
27 * 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
:
54 case GL_ONE_MINUS_DST_COLOR
:
56 case GL_ONE_MINUS_SRC_ALPHA
:
58 case GL_ONE_MINUS_DST_ALPHA
:
59 case GL_SRC_ALPHA_SATURATE
:
61 case GL_CONSTANT_COLOR
:
62 case GL_ONE_MINUS_CONSTANT_COLOR
:
63 case GL_CONSTANT_ALPHA
:
64 case GL_ONE_MINUS_CONSTANT_ALPHA
:
65 return _mesa_is_desktop_gl(ctx
) || ctx
->API
== API_OPENGLES2
;
68 case GL_ONE_MINUS_SRC1_COLOR
:
69 case GL_ONE_MINUS_SRC1_ALPHA
:
70 return ctx
->API
!= API_OPENGLES
71 && ctx
->Extensions
.ARB_blend_func_extended
;
79 * Check if given blend destination factor is legal.
80 * \return GL_TRUE if legal, GL_FALSE otherwise.
83 legal_dst_factor(const struct gl_context
*ctx
, GLenum factor
)
87 case GL_ONE_MINUS_DST_COLOR
:
91 case GL_ONE_MINUS_SRC_COLOR
:
93 case GL_ONE_MINUS_SRC_ALPHA
:
95 case GL_ONE_MINUS_DST_ALPHA
:
97 case GL_CONSTANT_COLOR
:
98 case GL_ONE_MINUS_CONSTANT_COLOR
:
99 case GL_CONSTANT_ALPHA
:
100 case GL_ONE_MINUS_CONSTANT_ALPHA
:
101 return _mesa_is_desktop_gl(ctx
) || ctx
->API
== API_OPENGLES2
;
102 case GL_SRC_ALPHA_SATURATE
:
103 return (ctx
->API
!= API_OPENGLES
104 && ctx
->Extensions
.ARB_blend_func_extended
)
105 || _mesa_is_gles3(ctx
);
108 case GL_ONE_MINUS_SRC1_COLOR
:
109 case GL_ONE_MINUS_SRC1_ALPHA
:
110 return ctx
->API
!= API_OPENGLES
111 && ctx
->Extensions
.ARB_blend_func_extended
;
119 * Check if src/dest RGB/A blend factors are legal. If not generate
121 * \return GL_TRUE if factors are legal, GL_FALSE otherwise.
124 validate_blend_factors(struct gl_context
*ctx
, const char *func
,
125 GLenum sfactorRGB
, GLenum dfactorRGB
,
126 GLenum sfactorA
, GLenum dfactorA
)
128 if (!legal_src_factor(ctx
, sfactorRGB
)) {
129 _mesa_error(ctx
, GL_INVALID_ENUM
,
130 "%s(sfactorRGB = %s)", func
,
131 _mesa_enum_to_string(sfactorRGB
));
135 if (!legal_dst_factor(ctx
, dfactorRGB
)) {
136 _mesa_error(ctx
, GL_INVALID_ENUM
,
137 "%s(dfactorRGB = %s)", func
,
138 _mesa_enum_to_string(dfactorRGB
));
142 if (sfactorA
!= sfactorRGB
&& !legal_src_factor(ctx
, sfactorA
)) {
143 _mesa_error(ctx
, GL_INVALID_ENUM
,
144 "%s(sfactorA = %s)", func
,
145 _mesa_enum_to_string(sfactorA
));
149 if (dfactorA
!= dfactorRGB
&& !legal_dst_factor(ctx
, dfactorA
)) {
150 _mesa_error(ctx
, GL_INVALID_ENUM
,
151 "%s(dfactorA = %s)", func
,
152 _mesa_enum_to_string(dfactorA
));
161 * Specify the blending operation.
163 * \param sfactor source factor operator.
164 * \param dfactor destination factor operator.
166 * \sa glBlendFunc, glBlendFuncSeparateEXT
169 _mesa_BlendFunc( GLenum sfactor
, GLenum dfactor
)
171 _mesa_BlendFuncSeparate(sfactor
, dfactor
, sfactor
, dfactor
);
175 blend_factor_is_dual_src(GLenum factor
)
177 return (factor
== GL_SRC1_COLOR
||
178 factor
== GL_SRC1_ALPHA
||
179 factor
== GL_ONE_MINUS_SRC1_COLOR
||
180 factor
== GL_ONE_MINUS_SRC1_ALPHA
);
184 update_uses_dual_src(struct gl_context
*ctx
, int buf
)
186 ctx
->Color
.Blend
[buf
]._UsesDualSrc
=
187 (blend_factor_is_dual_src(ctx
->Color
.Blend
[buf
].SrcRGB
) ||
188 blend_factor_is_dual_src(ctx
->Color
.Blend
[buf
].DstRGB
) ||
189 blend_factor_is_dual_src(ctx
->Color
.Blend
[buf
].SrcA
) ||
190 blend_factor_is_dual_src(ctx
->Color
.Blend
[buf
].DstA
));
195 * Return the number of per-buffer blend states to update in
196 * glBlendFunc, glBlendFuncSeparate, glBlendEquation, etc.
198 static inline unsigned
199 num_buffers(const struct gl_context
*ctx
)
201 return ctx
->Extensions
.ARB_draw_buffers_blend
202 ? ctx
->Const
.MaxDrawBuffers
: 1;
207 * Set the separate blend source/dest factors for all draw buffers.
209 * \param sfactorRGB RGB source factor operator.
210 * \param dfactorRGB RGB destination factor operator.
211 * \param sfactorA alpha source factor operator.
212 * \param dfactorA alpha destination factor operator.
215 _mesa_BlendFuncSeparate( GLenum sfactorRGB
, GLenum dfactorRGB
,
216 GLenum sfactorA
, GLenum dfactorA
)
218 GET_CURRENT_CONTEXT(ctx
);
219 const unsigned numBuffers
= num_buffers(ctx
);
221 bool changed
= false;
223 if (MESA_VERBOSE
& VERBOSE_API
)
224 _mesa_debug(ctx
, "glBlendFuncSeparate %s %s %s %s\n",
225 _mesa_enum_to_string(sfactorRGB
),
226 _mesa_enum_to_string(dfactorRGB
),
227 _mesa_enum_to_string(sfactorA
),
228 _mesa_enum_to_string(dfactorA
));
230 /* Check if we're really changing any state. If not, return early. */
231 if (ctx
->Color
._BlendFuncPerBuffer
) {
232 /* Check all per-buffer states */
233 for (buf
= 0; buf
< numBuffers
; buf
++) {
234 if (ctx
->Color
.Blend
[buf
].SrcRGB
!= sfactorRGB
||
235 ctx
->Color
.Blend
[buf
].DstRGB
!= dfactorRGB
||
236 ctx
->Color
.Blend
[buf
].SrcA
!= sfactorA
||
237 ctx
->Color
.Blend
[buf
].DstA
!= dfactorA
) {
244 /* only need to check 0th per-buffer state */
245 if (ctx
->Color
.Blend
[0].SrcRGB
!= sfactorRGB
||
246 ctx
->Color
.Blend
[0].DstRGB
!= dfactorRGB
||
247 ctx
->Color
.Blend
[0].SrcA
!= sfactorA
||
248 ctx
->Color
.Blend
[0].DstA
!= dfactorA
) {
256 if (!validate_blend_factors(ctx
, "glBlendFuncSeparate",
257 sfactorRGB
, dfactorRGB
,
258 sfactorA
, dfactorA
)) {
262 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
264 for (buf
= 0; buf
< numBuffers
; buf
++) {
265 ctx
->Color
.Blend
[buf
].SrcRGB
= sfactorRGB
;
266 ctx
->Color
.Blend
[buf
].DstRGB
= dfactorRGB
;
267 ctx
->Color
.Blend
[buf
].SrcA
= sfactorA
;
268 ctx
->Color
.Blend
[buf
].DstA
= dfactorA
;
271 update_uses_dual_src(ctx
, 0);
272 for (buf
= 1; buf
< numBuffers
; buf
++) {
273 ctx
->Color
.Blend
[buf
]._UsesDualSrc
= ctx
->Color
.Blend
[0]._UsesDualSrc
;
276 ctx
->Color
._BlendFuncPerBuffer
= GL_FALSE
;
278 if (ctx
->Driver
.BlendFuncSeparate
) {
279 ctx
->Driver
.BlendFuncSeparate(ctx
, sfactorRGB
, dfactorRGB
,
286 * Set blend source/dest factors for one color buffer/target.
289 _mesa_BlendFunciARB(GLuint buf
, GLenum sfactor
, GLenum dfactor
)
291 _mesa_BlendFuncSeparateiARB(buf
, sfactor
, dfactor
, sfactor
, dfactor
);
296 * Set separate blend source/dest factors for one color buffer/target.
299 _mesa_BlendFuncSeparateiARB(GLuint buf
, GLenum sfactorRGB
, GLenum dfactorRGB
,
300 GLenum sfactorA
, GLenum dfactorA
)
302 GET_CURRENT_CONTEXT(ctx
);
304 if (!ctx
->Extensions
.ARB_draw_buffers_blend
) {
305 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glBlendFunc[Separate]i()");
309 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
310 _mesa_error(ctx
, GL_INVALID_VALUE
, "glBlendFuncSeparatei(buffer=%u)",
315 if (ctx
->Color
.Blend
[buf
].SrcRGB
== sfactorRGB
&&
316 ctx
->Color
.Blend
[buf
].DstRGB
== dfactorRGB
&&
317 ctx
->Color
.Blend
[buf
].SrcA
== sfactorA
&&
318 ctx
->Color
.Blend
[buf
].DstA
== dfactorA
)
319 return; /* no change */
321 if (!validate_blend_factors(ctx
, "glBlendFuncSeparatei",
322 sfactorRGB
, dfactorRGB
,
323 sfactorA
, dfactorA
)) {
327 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
329 ctx
->Color
.Blend
[buf
].SrcRGB
= sfactorRGB
;
330 ctx
->Color
.Blend
[buf
].DstRGB
= dfactorRGB
;
331 ctx
->Color
.Blend
[buf
].SrcA
= sfactorA
;
332 ctx
->Color
.Blend
[buf
].DstA
= dfactorA
;
333 update_uses_dual_src(ctx
, buf
);
334 ctx
->Color
._BlendFuncPerBuffer
= GL_TRUE
;
339 * Return true if \p mode is a legal blending equation, excluding
340 * GL_KHR_blend_equation_advanced modes.
343 legal_simple_blend_equation(const struct gl_context
*ctx
, GLenum mode
)
347 case GL_FUNC_SUBTRACT
:
348 case GL_FUNC_REVERSE_SUBTRACT
:
352 return ctx
->Extensions
.EXT_blend_minmax
;
358 static enum gl_advanced_blend_mode
359 advanced_blend_mode_from_gl_enum(GLenum mode
)
362 case GL_MULTIPLY_KHR
:
363 return BLEND_MULTIPLY
;
367 return BLEND_OVERLAY
;
371 return BLEND_LIGHTEN
;
372 case GL_COLORDODGE_KHR
:
373 return BLEND_COLORDODGE
;
374 case GL_COLORBURN_KHR
:
375 return BLEND_COLORBURN
;
376 case GL_HARDLIGHT_KHR
:
377 return BLEND_HARDLIGHT
;
378 case GL_SOFTLIGHT_KHR
:
379 return BLEND_SOFTLIGHT
;
380 case GL_DIFFERENCE_KHR
:
381 return BLEND_DIFFERENCE
;
382 case GL_EXCLUSION_KHR
:
383 return BLEND_EXCLUSION
;
385 return BLEND_HSL_HUE
;
386 case GL_HSL_SATURATION_KHR
:
387 return BLEND_HSL_SATURATION
;
388 case GL_HSL_COLOR_KHR
:
389 return BLEND_HSL_COLOR
;
390 case GL_HSL_LUMINOSITY_KHR
:
391 return BLEND_HSL_LUMINOSITY
;
398 * If \p mode is one of the advanced blending equations defined by
399 * GL_KHR_blend_equation_advanced (and the extension is supported),
400 * return the corresponding BLEND_* enum. Otherwise, return BLEND_NONE
401 * (which can also be treated as false).
403 static enum gl_advanced_blend_mode
404 advanced_blend_mode(const struct gl_context
*ctx
, GLenum mode
)
406 return _mesa_has_KHR_blend_equation_advanced(ctx
) ?
407 advanced_blend_mode_from_gl_enum(mode
) : BLEND_NONE
;
410 /* This is really an extension function! */
412 _mesa_BlendEquation( GLenum mode
)
414 GET_CURRENT_CONTEXT(ctx
);
415 const unsigned numBuffers
= num_buffers(ctx
);
417 bool changed
= false;
418 enum gl_advanced_blend_mode advanced_mode
= advanced_blend_mode(ctx
, mode
);
420 if (MESA_VERBOSE
& VERBOSE_API
)
421 _mesa_debug(ctx
, "glBlendEquation(%s)\n",
422 _mesa_enum_to_string(mode
));
424 if (ctx
->Color
._BlendEquationPerBuffer
) {
425 /* Check all per-buffer states */
426 for (buf
= 0; buf
< numBuffers
; buf
++) {
427 if (ctx
->Color
.Blend
[buf
].EquationRGB
!= mode
||
428 ctx
->Color
.Blend
[buf
].EquationA
!= mode
) {
435 /* only need to check 0th per-buffer state */
436 if (ctx
->Color
.Blend
[0].EquationRGB
!= mode
||
437 ctx
->Color
.Blend
[0].EquationA
!= mode
) {
446 if (!legal_simple_blend_equation(ctx
, mode
) && !advanced_mode
) {
447 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquation");
451 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
453 for (buf
= 0; buf
< numBuffers
; buf
++) {
454 ctx
->Color
.Blend
[buf
].EquationRGB
= mode
;
455 ctx
->Color
.Blend
[buf
].EquationA
= mode
;
457 ctx
->Color
._BlendEquationPerBuffer
= GL_FALSE
;
458 ctx
->Color
._AdvancedBlendMode
= advanced_mode
;
460 if (ctx
->Driver
.BlendEquationSeparate
)
461 ctx
->Driver
.BlendEquationSeparate(ctx
, mode
, mode
);
466 * Set blend equation for one color buffer/target.
469 _mesa_BlendEquationiARB(GLuint buf
, GLenum mode
)
471 GET_CURRENT_CONTEXT(ctx
);
472 enum gl_advanced_blend_mode advanced_mode
= advanced_blend_mode(ctx
, mode
);
474 if (MESA_VERBOSE
& VERBOSE_API
)
475 _mesa_debug(ctx
, "glBlendEquationi(%u, %s)\n",
476 buf
, _mesa_enum_to_string(mode
));
478 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
479 _mesa_error(ctx
, GL_INVALID_VALUE
, "glBlendEquationi(buffer=%u)",
484 if (!legal_simple_blend_equation(ctx
, mode
) && !advanced_mode
) {
485 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationi");
489 if (ctx
->Color
.Blend
[buf
].EquationRGB
== mode
&&
490 ctx
->Color
.Blend
[buf
].EquationA
== mode
)
491 return; /* no change */
493 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
494 ctx
->Color
.Blend
[buf
].EquationRGB
= mode
;
495 ctx
->Color
.Blend
[buf
].EquationA
= mode
;
496 ctx
->Color
._BlendEquationPerBuffer
= GL_TRUE
;
499 ctx
->Color
._AdvancedBlendMode
= advanced_mode
;
504 _mesa_BlendEquationSeparate( GLenum modeRGB
, GLenum modeA
)
506 GET_CURRENT_CONTEXT(ctx
);
507 const unsigned numBuffers
= num_buffers(ctx
);
509 bool changed
= false;
511 if (MESA_VERBOSE
& VERBOSE_API
)
512 _mesa_debug(ctx
, "glBlendEquationSeparateEXT(%s %s)\n",
513 _mesa_enum_to_string(modeRGB
),
514 _mesa_enum_to_string(modeA
));
516 if (ctx
->Color
._BlendEquationPerBuffer
) {
517 /* Check all per-buffer states */
518 for (buf
= 0; buf
< numBuffers
; buf
++) {
519 if (ctx
->Color
.Blend
[buf
].EquationRGB
!= modeRGB
||
520 ctx
->Color
.Blend
[buf
].EquationA
!= modeA
) {
527 /* only need to check 0th per-buffer state */
528 if (ctx
->Color
.Blend
[0].EquationRGB
!= modeRGB
||
529 ctx
->Color
.Blend
[0].EquationA
!= modeA
) {
537 if ( (modeRGB
!= modeA
) && !ctx
->Extensions
.EXT_blend_equation_separate
) {
538 _mesa_error(ctx
, GL_INVALID_OPERATION
,
539 "glBlendEquationSeparateEXT not supported by driver");
543 /* Only allow simple blending equations.
544 * The GL_KHR_blend_equation_advanced spec says:
546 * "NOTE: These enums are not accepted by the <modeRGB> or <modeAlpha>
547 * parameters of BlendEquationSeparate or BlendEquationSeparatei."
549 if (!legal_simple_blend_equation(ctx
, modeRGB
)) {
550 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparateEXT(modeRGB)");
554 if (!legal_simple_blend_equation(ctx
, modeA
)) {
555 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparateEXT(modeA)");
559 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
561 for (buf
= 0; buf
< numBuffers
; buf
++) {
562 ctx
->Color
.Blend
[buf
].EquationRGB
= modeRGB
;
563 ctx
->Color
.Blend
[buf
].EquationA
= modeA
;
565 ctx
->Color
._BlendEquationPerBuffer
= GL_FALSE
;
566 ctx
->Color
._AdvancedBlendMode
= BLEND_NONE
;
568 if (ctx
->Driver
.BlendEquationSeparate
)
569 ctx
->Driver
.BlendEquationSeparate(ctx
, modeRGB
, modeA
);
574 * Set separate blend equations for one color buffer/target.
577 _mesa_BlendEquationSeparateiARB(GLuint buf
, GLenum modeRGB
, GLenum modeA
)
579 GET_CURRENT_CONTEXT(ctx
);
581 if (MESA_VERBOSE
& VERBOSE_API
)
582 _mesa_debug(ctx
, "glBlendEquationSeparatei(%u, %s %s)\n", buf
,
583 _mesa_enum_to_string(modeRGB
),
584 _mesa_enum_to_string(modeA
));
586 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
587 _mesa_error(ctx
, GL_INVALID_VALUE
, "glBlendEquationSeparatei(buffer=%u)",
592 /* Only allow simple blending equations.
593 * The GL_KHR_blend_equation_advanced spec says:
595 * "NOTE: These enums are not accepted by the <modeRGB> or <modeAlpha>
596 * parameters of BlendEquationSeparate or BlendEquationSeparatei."
598 if (!legal_simple_blend_equation(ctx
, modeRGB
)) {
599 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparatei(modeRGB)");
603 if (!legal_simple_blend_equation(ctx
, modeA
)) {
604 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparatei(modeA)");
608 if (ctx
->Color
.Blend
[buf
].EquationRGB
== modeRGB
&&
609 ctx
->Color
.Blend
[buf
].EquationA
== modeA
)
610 return; /* no change */
612 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
613 ctx
->Color
.Blend
[buf
].EquationRGB
= modeRGB
;
614 ctx
->Color
.Blend
[buf
].EquationA
= modeA
;
615 ctx
->Color
._BlendEquationPerBuffer
= GL_TRUE
;
616 ctx
->Color
._AdvancedBlendMode
= BLEND_NONE
;
621 * Set the blending color.
623 * \param red red color component.
624 * \param green green color component.
625 * \param blue blue color component.
626 * \param alpha alpha color component.
628 * \sa glBlendColor().
630 * Clamps the parameters and updates gl_colorbuffer_attrib::BlendColor. On a
631 * change, flushes the vertices and notifies the driver via
632 * dd_function_table::BlendColor callback.
635 _mesa_BlendColor( GLclampf red
, GLclampf green
, GLclampf blue
, GLclampf alpha
)
638 GET_CURRENT_CONTEXT(ctx
);
645 if (TEST_EQ_4V(tmp
, ctx
->Color
.BlendColorUnclamped
))
648 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
649 COPY_4FV( ctx
->Color
.BlendColorUnclamped
, tmp
);
651 ctx
->Color
.BlendColor
[0] = CLAMP(tmp
[0], 0.0F
, 1.0F
);
652 ctx
->Color
.BlendColor
[1] = CLAMP(tmp
[1], 0.0F
, 1.0F
);
653 ctx
->Color
.BlendColor
[2] = CLAMP(tmp
[2], 0.0F
, 1.0F
);
654 ctx
->Color
.BlendColor
[3] = CLAMP(tmp
[3], 0.0F
, 1.0F
);
656 if (ctx
->Driver
.BlendColor
)
657 ctx
->Driver
.BlendColor(ctx
, ctx
->Color
.BlendColor
);
662 * Specify the alpha test function.
664 * \param func alpha comparison function.
665 * \param ref reference value.
667 * Verifies the parameters and updates gl_colorbuffer_attrib.
668 * On a change, flushes the vertices and notifies the driver via
669 * dd_function_table::AlphaFunc callback.
672 _mesa_AlphaFunc( GLenum func
, GLclampf ref
)
674 GET_CURRENT_CONTEXT(ctx
);
676 if (MESA_VERBOSE
& VERBOSE_API
)
677 _mesa_debug(ctx
, "glAlphaFunc(%s, %f)\n",
678 _mesa_enum_to_string(func
), ref
);
680 if (ctx
->Color
.AlphaFunc
== func
&& ctx
->Color
.AlphaRefUnclamped
== ref
)
681 return; /* no change */
692 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
693 ctx
->Color
.AlphaFunc
= func
;
694 ctx
->Color
.AlphaRefUnclamped
= ref
;
695 ctx
->Color
.AlphaRef
= CLAMP(ref
, 0.0F
, 1.0F
);
697 if (ctx
->Driver
.AlphaFunc
)
698 ctx
->Driver
.AlphaFunc(ctx
, func
, ctx
->Color
.AlphaRef
);
702 _mesa_error( ctx
, GL_INVALID_ENUM
, "glAlphaFunc(func)" );
709 * Specify a logic pixel operation for color index rendering.
711 * \param opcode operation.
713 * Verifies that \p opcode is a valid enum and updates
714 * gl_colorbuffer_attrib::LogicOp.
715 * On a change, flushes the vertices and notifies the driver via the
716 * dd_function_table::LogicOpcode callback.
719 _mesa_LogicOp( GLenum opcode
)
721 GET_CURRENT_CONTEXT(ctx
);
723 if (MESA_VERBOSE
& VERBOSE_API
)
724 _mesa_debug(ctx
, "glLogicOp(%s)\n", _mesa_enum_to_string(opcode
));
730 case GL_COPY_INVERTED
:
740 case GL_AND_INVERTED
:
745 _mesa_error( ctx
, GL_INVALID_ENUM
, "glLogicOp" );
749 if (ctx
->Color
.LogicOp
== opcode
)
752 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
753 ctx
->Color
.LogicOp
= opcode
;
755 if (ctx
->Driver
.LogicOpcode
)
756 ctx
->Driver
.LogicOpcode( ctx
, opcode
);
761 _mesa_IndexMask( GLuint mask
)
763 GET_CURRENT_CONTEXT(ctx
);
765 if (ctx
->Color
.IndexMask
== mask
)
768 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
769 ctx
->Color
.IndexMask
= mask
;
774 * Enable or disable writing of frame buffer color components.
776 * \param red whether to mask writing of the red color component.
777 * \param green whether to mask writing of the green color component.
778 * \param blue whether to mask writing of the blue color component.
779 * \param alpha whether to mask writing of the alpha color component.
783 * Sets the appropriate value of gl_colorbuffer_attrib::ColorMask. On a
784 * change, flushes the vertices and notifies the driver via the
785 * dd_function_table::ColorMask callback.
788 _mesa_ColorMask( GLboolean red
, GLboolean green
,
789 GLboolean blue
, GLboolean alpha
)
791 GET_CURRENT_CONTEXT(ctx
);
796 if (MESA_VERBOSE
& VERBOSE_API
)
797 _mesa_debug(ctx
, "glColorMask(%d, %d, %d, %d)\n",
798 red
, green
, blue
, alpha
);
800 /* Shouldn't have any information about channel depth in core mesa
801 * -- should probably store these as the native booleans:
803 tmp
[RCOMP
] = red
? 0xff : 0x0;
804 tmp
[GCOMP
] = green
? 0xff : 0x0;
805 tmp
[BCOMP
] = blue
? 0xff : 0x0;
806 tmp
[ACOMP
] = alpha
? 0xff : 0x0;
809 for (i
= 0; i
< ctx
->Const
.MaxDrawBuffers
; i
++) {
810 if (!TEST_EQ_4V(tmp
, ctx
->Color
.ColorMask
[i
])) {
812 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
815 COPY_4UBV(ctx
->Color
.ColorMask
[i
], tmp
);
819 if (ctx
->Driver
.ColorMask
)
820 ctx
->Driver
.ColorMask( ctx
, red
, green
, blue
, alpha
);
825 * For GL_EXT_draw_buffers2 and GL3
828 _mesa_ColorMaski( GLuint buf
, GLboolean red
, GLboolean green
,
829 GLboolean blue
, GLboolean alpha
)
832 GET_CURRENT_CONTEXT(ctx
);
834 if (MESA_VERBOSE
& VERBOSE_API
)
835 _mesa_debug(ctx
, "glColorMaskIndexed %u %d %d %d %d\n",
836 buf
, red
, green
, blue
, alpha
);
838 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
839 _mesa_error(ctx
, GL_INVALID_VALUE
, "glColorMaskIndexed(buf=%u)", buf
);
843 /* Shouldn't have any information about channel depth in core mesa
844 * -- should probably store these as the native booleans:
846 tmp
[RCOMP
] = red
? 0xff : 0x0;
847 tmp
[GCOMP
] = green
? 0xff : 0x0;
848 tmp
[BCOMP
] = blue
? 0xff : 0x0;
849 tmp
[ACOMP
] = alpha
? 0xff : 0x0;
851 if (TEST_EQ_4V(tmp
, ctx
->Color
.ColorMask
[buf
]))
854 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
855 COPY_4UBV(ctx
->Color
.ColorMask
[buf
], tmp
);
860 _mesa_ClampColor(GLenum target
, GLenum clamp
)
862 GET_CURRENT_CONTEXT(ctx
);
864 /* Check for both the extension and the GL version, since the Intel driver
865 * does not advertise the extension in core profiles.
867 if (ctx
->Version
<= 30 && !ctx
->Extensions
.ARB_color_buffer_float
) {
868 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glClampColor()");
872 if (clamp
!= GL_TRUE
&& clamp
!= GL_FALSE
&& clamp
!= GL_FIXED_ONLY_ARB
) {
873 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClampColorARB(clamp)");
878 case GL_CLAMP_VERTEX_COLOR_ARB
:
879 if (ctx
->API
== API_OPENGL_CORE
)
881 FLUSH_VERTICES(ctx
, _NEW_LIGHT
);
882 ctx
->Light
.ClampVertexColor
= clamp
;
883 _mesa_update_clamp_vertex_color(ctx
, ctx
->DrawBuffer
);
885 case GL_CLAMP_FRAGMENT_COLOR_ARB
:
886 if (ctx
->API
== API_OPENGL_CORE
)
888 FLUSH_VERTICES(ctx
, _NEW_FRAG_CLAMP
);
889 ctx
->Color
.ClampFragmentColor
= clamp
;
890 _mesa_update_clamp_fragment_color(ctx
, ctx
->DrawBuffer
);
892 case GL_CLAMP_READ_COLOR_ARB
:
893 ctx
->Color
.ClampReadColor
= clamp
;
901 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClampColor(%s)",
902 _mesa_enum_to_string(target
));
906 get_clamp_color(const struct gl_framebuffer
*fb
, GLenum clamp
)
908 if (clamp
== GL_TRUE
|| clamp
== GL_FALSE
)
911 assert(clamp
== GL_FIXED_ONLY
);
915 return fb
->_AllColorBuffersFixedPoint
;
919 _mesa_get_clamp_fragment_color(const struct gl_context
*ctx
,
920 const struct gl_framebuffer
*drawFb
)
922 return get_clamp_color(drawFb
, ctx
->Color
.ClampFragmentColor
);
926 _mesa_get_clamp_vertex_color(const struct gl_context
*ctx
,
927 const struct gl_framebuffer
*drawFb
)
929 return get_clamp_color(drawFb
, ctx
->Light
.ClampVertexColor
);
933 _mesa_get_clamp_read_color(const struct gl_context
*ctx
,
934 const struct gl_framebuffer
*readFb
)
936 return get_clamp_color(readFb
, ctx
->Color
.ClampReadColor
);
940 * Update the ctx->Color._ClampFragmentColor field
943 _mesa_update_clamp_fragment_color(struct gl_context
*ctx
,
944 const struct gl_framebuffer
*drawFb
)
947 * - there is no colorbuffer
948 * - all colorbuffers are unsigned normalized, so clamping has no effect
949 * - there is an integer colorbuffer
951 if (!drawFb
|| !drawFb
->_HasSNormOrFloatColorBuffer
||
952 drawFb
->_IntegerBuffers
)
953 ctx
->Color
._ClampFragmentColor
= GL_FALSE
;
955 ctx
->Color
._ClampFragmentColor
=
956 _mesa_get_clamp_fragment_color(ctx
, drawFb
);
960 * Update the ctx->Color._ClampVertexColor field
963 _mesa_update_clamp_vertex_color(struct gl_context
*ctx
,
964 const struct gl_framebuffer
*drawFb
)
966 ctx
->Light
._ClampVertexColor
=
967 _mesa_get_clamp_vertex_color(ctx
, drawFb
);
971 * Returns an appropriate mesa_format for color rendering based on the
972 * GL_FRAMEBUFFER_SRGB state.
974 * Some drivers implement GL_FRAMEBUFFER_SRGB using a flag on the blend state
975 * (which GL_FRAMEBUFFER_SRGB maps to reasonably), but some have to do so by
976 * overriding the format of the surface. This is a helper for doing the
977 * surface format override variant.
980 _mesa_get_render_format(const struct gl_context
*ctx
, mesa_format format
)
982 if (ctx
->Color
.sRGBEnabled
)
985 return _mesa_get_srgb_format_linear(format
);
988 /**********************************************************************/
989 /** \name Initialization */
993 * Initialization of the context's Color attribute group.
995 * \param ctx GL context.
997 * Initializes the related fields in the context color attribute group,
998 * __struct gl_contextRec::Color.
1000 void _mesa_init_color( struct gl_context
* ctx
)
1004 /* Color buffer group */
1005 ctx
->Color
.IndexMask
= ~0u;
1006 memset(ctx
->Color
.ColorMask
, 0xff, sizeof(ctx
->Color
.ColorMask
));
1007 ctx
->Color
.ClearIndex
= 0;
1008 ASSIGN_4V( ctx
->Color
.ClearColor
.f
, 0, 0, 0, 0 );
1009 ctx
->Color
.AlphaEnabled
= GL_FALSE
;
1010 ctx
->Color
.AlphaFunc
= GL_ALWAYS
;
1011 ctx
->Color
.AlphaRef
= 0;
1012 ctx
->Color
.BlendEnabled
= 0x0;
1013 for (i
= 0; i
< ARRAY_SIZE(ctx
->Color
.Blend
); i
++) {
1014 ctx
->Color
.Blend
[i
].SrcRGB
= GL_ONE
;
1015 ctx
->Color
.Blend
[i
].DstRGB
= GL_ZERO
;
1016 ctx
->Color
.Blend
[i
].SrcA
= GL_ONE
;
1017 ctx
->Color
.Blend
[i
].DstA
= GL_ZERO
;
1018 ctx
->Color
.Blend
[i
].EquationRGB
= GL_FUNC_ADD
;
1019 ctx
->Color
.Blend
[i
].EquationA
= GL_FUNC_ADD
;
1021 ASSIGN_4V( ctx
->Color
.BlendColor
, 0.0, 0.0, 0.0, 0.0 );
1022 ASSIGN_4V( ctx
->Color
.BlendColorUnclamped
, 0.0, 0.0, 0.0, 0.0 );
1023 ctx
->Color
.IndexLogicOpEnabled
= GL_FALSE
;
1024 ctx
->Color
.ColorLogicOpEnabled
= GL_FALSE
;
1025 ctx
->Color
.LogicOp
= GL_COPY
;
1026 ctx
->Color
.DitherFlag
= GL_TRUE
;
1028 /* GL_FRONT is not possible on GLES. Instead GL_BACK will render to either
1029 * the front or the back buffer depending on the config */
1030 if (ctx
->Visual
.doubleBufferMode
|| _mesa_is_gles(ctx
)) {
1031 ctx
->Color
.DrawBuffer
[0] = GL_BACK
;
1034 ctx
->Color
.DrawBuffer
[0] = GL_FRONT
;
1037 ctx
->Color
.ClampFragmentColor
= ctx
->API
== API_OPENGL_COMPAT
?
1038 GL_FIXED_ONLY_ARB
: GL_FALSE
;
1039 ctx
->Color
._ClampFragmentColor
= GL_FALSE
;
1040 ctx
->Color
.ClampReadColor
= GL_FIXED_ONLY_ARB
;
1042 /* GLES 1/2/3 behaves as though GL_FRAMEBUFFER_SRGB is always enabled
1043 * if EGL_KHR_gl_colorspace has been used to request sRGB.
1045 ctx
->Color
.sRGBEnabled
= _mesa_is_gles(ctx
);
1047 ctx
->Color
.BlendCoherent
= true;