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 blend_factor_is_dual_src(GLenum factor
)
163 return (factor
== GL_SRC1_COLOR
||
164 factor
== GL_SRC1_ALPHA
||
165 factor
== GL_ONE_MINUS_SRC1_COLOR
||
166 factor
== GL_ONE_MINUS_SRC1_ALPHA
);
170 update_uses_dual_src(struct gl_context
*ctx
, int buf
)
172 ctx
->Color
.Blend
[buf
]._UsesDualSrc
=
173 (blend_factor_is_dual_src(ctx
->Color
.Blend
[buf
].SrcRGB
) ||
174 blend_factor_is_dual_src(ctx
->Color
.Blend
[buf
].DstRGB
) ||
175 blend_factor_is_dual_src(ctx
->Color
.Blend
[buf
].SrcA
) ||
176 blend_factor_is_dual_src(ctx
->Color
.Blend
[buf
].DstA
));
181 * Return the number of per-buffer blend states to update in
182 * glBlendFunc, glBlendFuncSeparate, glBlendEquation, etc.
184 static inline unsigned
185 num_buffers(const struct gl_context
*ctx
)
187 return ctx
->Extensions
.ARB_draw_buffers_blend
188 ? ctx
->Const
.MaxDrawBuffers
: 1;
192 /* Returns true if there was no change */
194 skip_blend_state_update(const struct gl_context
*ctx
,
195 GLenum sfactorRGB
, GLenum dfactorRGB
,
196 GLenum sfactorA
, GLenum dfactorA
)
198 /* Check if we're really changing any state. If not, return early. */
199 if (ctx
->Color
._BlendFuncPerBuffer
) {
200 const unsigned numBuffers
= num_buffers(ctx
);
202 /* Check all per-buffer states */
203 for (unsigned buf
= 0; buf
< numBuffers
; buf
++) {
204 if (ctx
->Color
.Blend
[buf
].SrcRGB
!= sfactorRGB
||
205 ctx
->Color
.Blend
[buf
].DstRGB
!= dfactorRGB
||
206 ctx
->Color
.Blend
[buf
].SrcA
!= sfactorA
||
207 ctx
->Color
.Blend
[buf
].DstA
!= dfactorA
) {
213 /* only need to check 0th per-buffer state */
214 if (ctx
->Color
.Blend
[0].SrcRGB
!= sfactorRGB
||
215 ctx
->Color
.Blend
[0].DstRGB
!= dfactorRGB
||
216 ctx
->Color
.Blend
[0].SrcA
!= sfactorA
||
217 ctx
->Color
.Blend
[0].DstA
!= dfactorA
) {
227 blend_func_separate(struct gl_context
*ctx
,
228 GLenum sfactorRGB
, GLenum dfactorRGB
,
229 GLenum sfactorA
, GLenum dfactorA
)
231 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewBlend
? 0 : _NEW_COLOR
);
232 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewBlend
;
234 const unsigned numBuffers
= num_buffers(ctx
);
235 for (unsigned buf
= 0; buf
< numBuffers
; buf
++) {
236 ctx
->Color
.Blend
[buf
].SrcRGB
= sfactorRGB
;
237 ctx
->Color
.Blend
[buf
].DstRGB
= dfactorRGB
;
238 ctx
->Color
.Blend
[buf
].SrcA
= sfactorA
;
239 ctx
->Color
.Blend
[buf
].DstA
= dfactorA
;
242 update_uses_dual_src(ctx
, 0);
243 for (unsigned buf
= 1; buf
< numBuffers
; buf
++) {
244 ctx
->Color
.Blend
[buf
]._UsesDualSrc
= ctx
->Color
.Blend
[0]._UsesDualSrc
;
247 ctx
->Color
._BlendFuncPerBuffer
= GL_FALSE
;
249 if (ctx
->Driver
.BlendFuncSeparate
) {
250 ctx
->Driver
.BlendFuncSeparate(ctx
, sfactorRGB
, dfactorRGB
,
257 * Specify the blending operation.
259 * \param sfactor source factor operator.
260 * \param dfactor destination factor operator.
262 * \sa glBlendFunc, glBlendFuncSeparateEXT
265 _mesa_BlendFunc( GLenum sfactor
, GLenum dfactor
)
267 GET_CURRENT_CONTEXT(ctx
);
269 if (skip_blend_state_update(ctx
, sfactor
, dfactor
, sfactor
, dfactor
))
272 if (!validate_blend_factors(ctx
, "glBlendFunc",
273 sfactor
, dfactor
, sfactor
, dfactor
)) {
277 blend_func_separate(ctx
, sfactor
, dfactor
, sfactor
, dfactor
);
282 _mesa_BlendFunc_no_error(GLenum sfactor
, GLenum dfactor
)
284 GET_CURRENT_CONTEXT(ctx
);
286 if (skip_blend_state_update(ctx
, sfactor
, dfactor
, sfactor
, dfactor
))
289 blend_func_separate(ctx
, sfactor
, dfactor
, sfactor
, dfactor
);
294 * Set the separate blend source/dest factors for all draw buffers.
296 * \param sfactorRGB RGB source factor operator.
297 * \param dfactorRGB RGB destination factor operator.
298 * \param sfactorA alpha source factor operator.
299 * \param dfactorA alpha destination factor operator.
302 _mesa_BlendFuncSeparate( GLenum sfactorRGB
, GLenum dfactorRGB
,
303 GLenum sfactorA
, GLenum dfactorA
)
305 GET_CURRENT_CONTEXT(ctx
);
307 if (MESA_VERBOSE
& VERBOSE_API
)
308 _mesa_debug(ctx
, "glBlendFuncSeparate %s %s %s %s\n",
309 _mesa_enum_to_string(sfactorRGB
),
310 _mesa_enum_to_string(dfactorRGB
),
311 _mesa_enum_to_string(sfactorA
),
312 _mesa_enum_to_string(dfactorA
));
316 if (skip_blend_state_update(ctx
, sfactorRGB
, dfactorRGB
, sfactorA
, dfactorA
))
319 if (!validate_blend_factors(ctx
, "glBlendFuncSeparate",
320 sfactorRGB
, dfactorRGB
,
321 sfactorA
, dfactorA
)) {
325 blend_func_separate(ctx
, sfactorRGB
, dfactorRGB
, sfactorA
, dfactorA
);
330 _mesa_BlendFuncSeparate_no_error(GLenum sfactorRGB
, GLenum dfactorRGB
,
331 GLenum sfactorA
, GLenum dfactorA
)
333 GET_CURRENT_CONTEXT(ctx
);
335 if (skip_blend_state_update(ctx
, sfactorRGB
, dfactorRGB
, sfactorA
, dfactorA
))
338 blend_func_separate(ctx
, sfactorRGB
, dfactorRGB
, sfactorA
, dfactorA
);
343 _mesa_BlendFunciARB_no_error(GLuint buf
, GLenum sfactor
, GLenum dfactor
)
345 _mesa_BlendFuncSeparateiARB_no_error(buf
, sfactor
, dfactor
, sfactor
,
351 * Set blend source/dest factors for one color buffer/target.
354 _mesa_BlendFunciARB(GLuint buf
, GLenum sfactor
, GLenum dfactor
)
356 _mesa_BlendFuncSeparateiARB(buf
, sfactor
, dfactor
, sfactor
, dfactor
);
360 static ALWAYS_INLINE
void
361 blend_func_separatei(GLuint buf
, GLenum sfactorRGB
, GLenum dfactorRGB
,
362 GLenum sfactorA
, GLenum dfactorA
, bool no_error
)
364 GET_CURRENT_CONTEXT(ctx
);
367 if (!ctx
->Extensions
.ARB_draw_buffers_blend
) {
368 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glBlendFunc[Separate]i()");
372 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
373 _mesa_error(ctx
, GL_INVALID_VALUE
, "glBlendFuncSeparatei(buffer=%u)",
379 if (ctx
->Color
.Blend
[buf
].SrcRGB
== sfactorRGB
&&
380 ctx
->Color
.Blend
[buf
].DstRGB
== dfactorRGB
&&
381 ctx
->Color
.Blend
[buf
].SrcA
== sfactorA
&&
382 ctx
->Color
.Blend
[buf
].DstA
== dfactorA
)
383 return; /* no change */
385 if (!no_error
&& !validate_blend_factors(ctx
, "glBlendFuncSeparatei",
386 sfactorRGB
, dfactorRGB
,
387 sfactorA
, dfactorA
)) {
391 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewBlend
? 0 : _NEW_COLOR
);
392 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewBlend
;
394 ctx
->Color
.Blend
[buf
].SrcRGB
= sfactorRGB
;
395 ctx
->Color
.Blend
[buf
].DstRGB
= dfactorRGB
;
396 ctx
->Color
.Blend
[buf
].SrcA
= sfactorA
;
397 ctx
->Color
.Blend
[buf
].DstA
= dfactorA
;
398 update_uses_dual_src(ctx
, buf
);
399 ctx
->Color
._BlendFuncPerBuffer
= GL_TRUE
;
404 _mesa_BlendFuncSeparateiARB_no_error(GLuint buf
, GLenum sfactorRGB
,
405 GLenum dfactorRGB
, GLenum sfactorA
,
408 blend_func_separatei(buf
, sfactorRGB
, dfactorRGB
, sfactorA
, dfactorA
,
414 * Set separate blend source/dest factors for one color buffer/target.
417 _mesa_BlendFuncSeparateiARB(GLuint buf
, GLenum sfactorRGB
, GLenum dfactorRGB
,
418 GLenum sfactorA
, GLenum dfactorA
)
420 blend_func_separatei(buf
, sfactorRGB
, dfactorRGB
, sfactorA
, dfactorA
,
426 * Return true if \p mode is a legal blending equation, excluding
427 * GL_KHR_blend_equation_advanced modes.
430 legal_simple_blend_equation(const struct gl_context
*ctx
, GLenum mode
)
434 case GL_FUNC_SUBTRACT
:
435 case GL_FUNC_REVERSE_SUBTRACT
:
439 return ctx
->Extensions
.EXT_blend_minmax
;
445 static enum gl_advanced_blend_mode
446 advanced_blend_mode_from_gl_enum(GLenum mode
)
449 case GL_MULTIPLY_KHR
:
450 return BLEND_MULTIPLY
;
454 return BLEND_OVERLAY
;
458 return BLEND_LIGHTEN
;
459 case GL_COLORDODGE_KHR
:
460 return BLEND_COLORDODGE
;
461 case GL_COLORBURN_KHR
:
462 return BLEND_COLORBURN
;
463 case GL_HARDLIGHT_KHR
:
464 return BLEND_HARDLIGHT
;
465 case GL_SOFTLIGHT_KHR
:
466 return BLEND_SOFTLIGHT
;
467 case GL_DIFFERENCE_KHR
:
468 return BLEND_DIFFERENCE
;
469 case GL_EXCLUSION_KHR
:
470 return BLEND_EXCLUSION
;
472 return BLEND_HSL_HUE
;
473 case GL_HSL_SATURATION_KHR
:
474 return BLEND_HSL_SATURATION
;
475 case GL_HSL_COLOR_KHR
:
476 return BLEND_HSL_COLOR
;
477 case GL_HSL_LUMINOSITY_KHR
:
478 return BLEND_HSL_LUMINOSITY
;
485 * If \p mode is one of the advanced blending equations defined by
486 * GL_KHR_blend_equation_advanced (and the extension is supported),
487 * return the corresponding BLEND_* enum. Otherwise, return BLEND_NONE
488 * (which can also be treated as false).
490 static enum gl_advanced_blend_mode
491 advanced_blend_mode(const struct gl_context
*ctx
, GLenum mode
)
493 return _mesa_has_KHR_blend_equation_advanced(ctx
) ?
494 advanced_blend_mode_from_gl_enum(mode
) : BLEND_NONE
;
497 /* This is really an extension function! */
499 _mesa_BlendEquation( GLenum mode
)
501 GET_CURRENT_CONTEXT(ctx
);
502 const unsigned numBuffers
= num_buffers(ctx
);
504 bool changed
= false;
505 enum gl_advanced_blend_mode advanced_mode
= advanced_blend_mode(ctx
, mode
);
507 if (MESA_VERBOSE
& VERBOSE_API
)
508 _mesa_debug(ctx
, "glBlendEquation(%s)\n",
509 _mesa_enum_to_string(mode
));
511 if (ctx
->Color
._BlendEquationPerBuffer
) {
512 /* Check all per-buffer states */
513 for (buf
= 0; buf
< numBuffers
; buf
++) {
514 if (ctx
->Color
.Blend
[buf
].EquationRGB
!= mode
||
515 ctx
->Color
.Blend
[buf
].EquationA
!= mode
) {
522 /* only need to check 0th per-buffer state */
523 if (ctx
->Color
.Blend
[0].EquationRGB
!= mode
||
524 ctx
->Color
.Blend
[0].EquationA
!= mode
) {
533 if (!legal_simple_blend_equation(ctx
, mode
) && !advanced_mode
) {
534 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquation");
538 _mesa_flush_vertices_for_blend_adv(ctx
, ctx
->Color
.BlendEnabled
,
541 for (buf
= 0; buf
< numBuffers
; buf
++) {
542 ctx
->Color
.Blend
[buf
].EquationRGB
= mode
;
543 ctx
->Color
.Blend
[buf
].EquationA
= mode
;
545 ctx
->Color
._BlendEquationPerBuffer
= GL_FALSE
;
546 ctx
->Color
._AdvancedBlendMode
= advanced_mode
;
548 if (ctx
->Driver
.BlendEquationSeparate
)
549 ctx
->Driver
.BlendEquationSeparate(ctx
, mode
, mode
);
554 * Set blend equation for one color buffer/target.
557 blend_equationi(struct gl_context
*ctx
, GLuint buf
, GLenum mode
,
558 enum gl_advanced_blend_mode advanced_mode
)
560 if (ctx
->Color
.Blend
[buf
].EquationRGB
== mode
&&
561 ctx
->Color
.Blend
[buf
].EquationA
== mode
)
562 return; /* no change */
564 _mesa_flush_vertices_for_blend_adv(ctx
, ctx
->Color
.BlendEnabled
,
566 ctx
->Color
.Blend
[buf
].EquationRGB
= mode
;
567 ctx
->Color
.Blend
[buf
].EquationA
= mode
;
568 ctx
->Color
._BlendEquationPerBuffer
= GL_TRUE
;
571 ctx
->Color
._AdvancedBlendMode
= advanced_mode
;
576 _mesa_BlendEquationiARB_no_error(GLuint buf
, GLenum mode
)
578 GET_CURRENT_CONTEXT(ctx
);
580 enum gl_advanced_blend_mode advanced_mode
= advanced_blend_mode(ctx
, mode
);
581 blend_equationi(ctx
, buf
, mode
, advanced_mode
);
586 _mesa_BlendEquationiARB(GLuint buf
, GLenum mode
)
588 GET_CURRENT_CONTEXT(ctx
);
589 enum gl_advanced_blend_mode advanced_mode
= advanced_blend_mode(ctx
, mode
);
591 if (MESA_VERBOSE
& VERBOSE_API
)
592 _mesa_debug(ctx
, "glBlendEquationi(%u, %s)\n",
593 buf
, _mesa_enum_to_string(mode
));
595 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
596 _mesa_error(ctx
, GL_INVALID_VALUE
, "glBlendEquationi(buffer=%u)",
601 if (!legal_simple_blend_equation(ctx
, mode
) && !advanced_mode
) {
602 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationi");
606 blend_equationi(ctx
, buf
, mode
, advanced_mode
);
611 blend_equation_separate(struct gl_context
*ctx
, GLenum modeRGB
, GLenum modeA
,
614 const unsigned numBuffers
= num_buffers(ctx
);
616 bool changed
= false;
618 if (ctx
->Color
._BlendEquationPerBuffer
) {
619 /* Check all per-buffer states */
620 for (buf
= 0; buf
< numBuffers
; buf
++) {
621 if (ctx
->Color
.Blend
[buf
].EquationRGB
!= modeRGB
||
622 ctx
->Color
.Blend
[buf
].EquationA
!= modeA
) {
628 /* only need to check 0th per-buffer state */
629 if (ctx
->Color
.Blend
[0].EquationRGB
!= modeRGB
||
630 ctx
->Color
.Blend
[0].EquationA
!= modeA
) {
639 if ((modeRGB
!= modeA
) && !ctx
->Extensions
.EXT_blend_equation_separate
) {
640 _mesa_error(ctx
, GL_INVALID_OPERATION
,
641 "glBlendEquationSeparateEXT not supported by driver");
645 /* Only allow simple blending equations.
646 * The GL_KHR_blend_equation_advanced spec says:
648 * "NOTE: These enums are not accepted by the <modeRGB> or <modeAlpha>
649 * parameters of BlendEquationSeparate or BlendEquationSeparatei."
651 if (!legal_simple_blend_equation(ctx
, modeRGB
)) {
652 _mesa_error(ctx
, GL_INVALID_ENUM
,
653 "glBlendEquationSeparateEXT(modeRGB)");
657 if (!legal_simple_blend_equation(ctx
, modeA
)) {
658 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparateEXT(modeA)");
663 _mesa_flush_vertices_for_blend_state(ctx
);
665 for (buf
= 0; buf
< numBuffers
; buf
++) {
666 ctx
->Color
.Blend
[buf
].EquationRGB
= modeRGB
;
667 ctx
->Color
.Blend
[buf
].EquationA
= modeA
;
669 ctx
->Color
._BlendEquationPerBuffer
= GL_FALSE
;
670 ctx
->Color
._AdvancedBlendMode
= BLEND_NONE
;
672 if (ctx
->Driver
.BlendEquationSeparate
)
673 ctx
->Driver
.BlendEquationSeparate(ctx
, modeRGB
, modeA
);
678 _mesa_BlendEquationSeparate_no_error(GLenum modeRGB
, GLenum modeA
)
680 GET_CURRENT_CONTEXT(ctx
);
681 blend_equation_separate(ctx
, modeRGB
, modeA
, true);
686 _mesa_BlendEquationSeparate(GLenum modeRGB
, GLenum modeA
)
688 GET_CURRENT_CONTEXT(ctx
);
690 if (MESA_VERBOSE
& VERBOSE_API
)
691 _mesa_debug(ctx
, "glBlendEquationSeparateEXT(%s %s)\n",
692 _mesa_enum_to_string(modeRGB
),
693 _mesa_enum_to_string(modeA
));
695 blend_equation_separate(ctx
, modeRGB
, modeA
, false);
699 static ALWAYS_INLINE
void
700 blend_equation_separatei(struct gl_context
*ctx
, GLuint buf
, GLenum modeRGB
,
701 GLenum modeA
, bool no_error
)
703 if (ctx
->Color
.Blend
[buf
].EquationRGB
== modeRGB
&&
704 ctx
->Color
.Blend
[buf
].EquationA
== modeA
)
705 return; /* no change */
708 /* Only allow simple blending equations.
709 * The GL_KHR_blend_equation_advanced spec says:
711 * "NOTE: These enums are not accepted by the <modeRGB> or <modeAlpha>
712 * parameters of BlendEquationSeparate or BlendEquationSeparatei."
714 if (!legal_simple_blend_equation(ctx
, modeRGB
)) {
715 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparatei(modeRGB)");
719 if (!legal_simple_blend_equation(ctx
, modeA
)) {
720 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparatei(modeA)");
725 _mesa_flush_vertices_for_blend_state(ctx
);
726 ctx
->Color
.Blend
[buf
].EquationRGB
= modeRGB
;
727 ctx
->Color
.Blend
[buf
].EquationA
= modeA
;
728 ctx
->Color
._BlendEquationPerBuffer
= GL_TRUE
;
729 ctx
->Color
._AdvancedBlendMode
= BLEND_NONE
;
734 _mesa_BlendEquationSeparateiARB_no_error(GLuint buf
, GLenum modeRGB
,
737 GET_CURRENT_CONTEXT(ctx
);
738 blend_equation_separatei(ctx
, buf
, modeRGB
, modeA
, true);
743 * Set separate blend equations for one color buffer/target.
746 _mesa_BlendEquationSeparateiARB(GLuint buf
, GLenum modeRGB
, GLenum modeA
)
748 GET_CURRENT_CONTEXT(ctx
);
750 if (MESA_VERBOSE
& VERBOSE_API
)
751 _mesa_debug(ctx
, "glBlendEquationSeparatei(%u, %s %s)\n", buf
,
752 _mesa_enum_to_string(modeRGB
),
753 _mesa_enum_to_string(modeA
));
755 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
756 _mesa_error(ctx
, GL_INVALID_VALUE
, "glBlendEquationSeparatei(buffer=%u)",
761 blend_equation_separatei(ctx
, buf
, modeRGB
, modeA
, false);
766 * Set the blending color.
768 * \param red red color component.
769 * \param green green color component.
770 * \param blue blue color component.
771 * \param alpha alpha color component.
773 * \sa glBlendColor().
775 * Clamps the parameters and updates gl_colorbuffer_attrib::BlendColor. On a
776 * change, flushes the vertices and notifies the driver via
777 * dd_function_table::BlendColor callback.
780 _mesa_BlendColor( GLclampf red
, GLclampf green
, GLclampf blue
, GLclampf alpha
)
783 GET_CURRENT_CONTEXT(ctx
);
790 if (TEST_EQ_4V(tmp
, ctx
->Color
.BlendColorUnclamped
))
793 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewBlendColor
? 0 : _NEW_COLOR
);
794 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewBlendColor
;
795 COPY_4FV( ctx
->Color
.BlendColorUnclamped
, tmp
);
797 ctx
->Color
.BlendColor
[0] = CLAMP(tmp
[0], 0.0F
, 1.0F
);
798 ctx
->Color
.BlendColor
[1] = CLAMP(tmp
[1], 0.0F
, 1.0F
);
799 ctx
->Color
.BlendColor
[2] = CLAMP(tmp
[2], 0.0F
, 1.0F
);
800 ctx
->Color
.BlendColor
[3] = CLAMP(tmp
[3], 0.0F
, 1.0F
);
802 if (ctx
->Driver
.BlendColor
)
803 ctx
->Driver
.BlendColor(ctx
, ctx
->Color
.BlendColor
);
808 * Specify the alpha test function.
810 * \param func alpha comparison function.
811 * \param ref reference value.
813 * Verifies the parameters and updates gl_colorbuffer_attrib.
814 * On a change, flushes the vertices and notifies the driver via
815 * dd_function_table::AlphaFunc callback.
818 _mesa_AlphaFunc( GLenum func
, GLclampf ref
)
820 GET_CURRENT_CONTEXT(ctx
);
822 if (MESA_VERBOSE
& VERBOSE_API
)
823 _mesa_debug(ctx
, "glAlphaFunc(%s, %f)\n",
824 _mesa_enum_to_string(func
), ref
);
826 if (ctx
->Color
.AlphaFunc
== func
&& ctx
->Color
.AlphaRefUnclamped
== ref
)
827 return; /* no change */
838 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewAlphaTest
? 0 : _NEW_COLOR
);
839 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewAlphaTest
;
840 ctx
->Color
.AlphaFunc
= func
;
841 ctx
->Color
.AlphaRefUnclamped
= ref
;
842 ctx
->Color
.AlphaRef
= CLAMP(ref
, 0.0F
, 1.0F
);
844 if (ctx
->Driver
.AlphaFunc
)
845 ctx
->Driver
.AlphaFunc(ctx
, func
, ctx
->Color
.AlphaRef
);
849 _mesa_error( ctx
, GL_INVALID_ENUM
, "glAlphaFunc(func)" );
854 static const enum gl_logicop_mode color_logicop_mapping
[16] = {
857 COLOR_LOGICOP_AND_REVERSE
,
859 COLOR_LOGICOP_AND_INVERTED
,
865 COLOR_LOGICOP_INVERT
,
866 COLOR_LOGICOP_OR_REVERSE
,
867 COLOR_LOGICOP_COPY_INVERTED
,
868 COLOR_LOGICOP_OR_INVERTED
,
873 static ALWAYS_INLINE
void
874 logic_op(struct gl_context
*ctx
, GLenum opcode
, bool no_error
)
876 if (ctx
->Color
.LogicOp
== opcode
)
884 case GL_COPY_INVERTED
:
894 case GL_AND_INVERTED
:
899 _mesa_error( ctx
, GL_INVALID_ENUM
, "glLogicOp" );
904 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewLogicOp
? 0 : _NEW_COLOR
);
905 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewLogicOp
;
906 ctx
->Color
.LogicOp
= opcode
;
907 ctx
->Color
._LogicOp
= color_logicop_mapping
[opcode
& 0x0f];
909 if (ctx
->Driver
.LogicOpcode
)
910 ctx
->Driver
.LogicOpcode(ctx
, ctx
->Color
._LogicOp
);
915 * Specify a logic pixel operation for color index rendering.
917 * \param opcode operation.
919 * Verifies that \p opcode is a valid enum and updates
920 * gl_colorbuffer_attrib::LogicOp.
921 * On a change, flushes the vertices and notifies the driver via the
922 * dd_function_table::LogicOpcode callback.
925 _mesa_LogicOp( GLenum opcode
)
927 GET_CURRENT_CONTEXT(ctx
);
929 if (MESA_VERBOSE
& VERBOSE_API
)
930 _mesa_debug(ctx
, "glLogicOp(%s)\n", _mesa_enum_to_string(opcode
));
932 logic_op(ctx
, opcode
, false);
937 _mesa_LogicOp_no_error(GLenum opcode
)
939 GET_CURRENT_CONTEXT(ctx
);
940 logic_op(ctx
, opcode
, true);
945 _mesa_IndexMask( GLuint mask
)
947 GET_CURRENT_CONTEXT(ctx
);
949 if (ctx
->Color
.IndexMask
== mask
)
952 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewColorMask
? 0 : _NEW_COLOR
);
953 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewColorMask
;
954 ctx
->Color
.IndexMask
= mask
;
959 * Enable or disable writing of frame buffer color components.
961 * \param red whether to mask writing of the red color component.
962 * \param green whether to mask writing of the green color component.
963 * \param blue whether to mask writing of the blue color component.
964 * \param alpha whether to mask writing of the alpha color component.
968 * Sets the appropriate value of gl_colorbuffer_attrib::ColorMask. On a
969 * change, flushes the vertices and notifies the driver via the
970 * dd_function_table::ColorMask callback.
973 _mesa_ColorMask( GLboolean red
, GLboolean green
,
974 GLboolean blue
, GLboolean alpha
)
976 GET_CURRENT_CONTEXT(ctx
);
978 if (MESA_VERBOSE
& VERBOSE_API
)
979 _mesa_debug(ctx
, "glColorMask(%d, %d, %d, %d)\n",
980 red
, green
, blue
, alpha
);
982 GLbitfield mask
= (!!red
) |
986 mask
= _mesa_replicate_colormask(mask
, ctx
->Const
.MaxDrawBuffers
);
988 if (ctx
->Color
.ColorMask
== mask
)
991 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewColorMask
? 0 : _NEW_COLOR
);
992 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewColorMask
;
993 ctx
->Color
.ColorMask
= mask
;
995 if (ctx
->Driver
.ColorMask
)
996 ctx
->Driver
.ColorMask( ctx
, red
, green
, blue
, alpha
);
1001 * For GL_EXT_draw_buffers2 and GL3
1004 _mesa_ColorMaski(GLuint buf
, GLboolean red
, GLboolean green
,
1005 GLboolean blue
, GLboolean alpha
)
1007 GET_CURRENT_CONTEXT(ctx
);
1009 if (MESA_VERBOSE
& VERBOSE_API
)
1010 _mesa_debug(ctx
, "glColorMaski %u %d %d %d %d\n",
1011 buf
, red
, green
, blue
, alpha
);
1013 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
1014 _mesa_error(ctx
, GL_INVALID_VALUE
, "glColorMaski(buf=%u)", buf
);
1018 GLbitfield mask
= (!!red
) |
1023 if (GET_COLORMASK(ctx
->Color
.ColorMask
, buf
) == mask
)
1026 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewColorMask
? 0 : _NEW_COLOR
);
1027 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewColorMask
;
1028 ctx
->Color
.ColorMask
&= ~(0xf << (4 * buf
));
1029 ctx
->Color
.ColorMask
|= mask
<< (4 * buf
);
1034 _mesa_ClampColor(GLenum target
, GLenum clamp
)
1036 GET_CURRENT_CONTEXT(ctx
);
1038 /* Check for both the extension and the GL version, since the Intel driver
1039 * does not advertise the extension in core profiles.
1041 if (ctx
->Version
<= 30 && !ctx
->Extensions
.ARB_color_buffer_float
) {
1042 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glClampColor()");
1046 if (clamp
!= GL_TRUE
&& clamp
!= GL_FALSE
&& clamp
!= GL_FIXED_ONLY_ARB
) {
1047 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClampColorARB(clamp)");
1052 case GL_CLAMP_VERTEX_COLOR_ARB
:
1053 if (ctx
->API
== API_OPENGL_CORE
)
1055 FLUSH_VERTICES(ctx
, _NEW_LIGHT
);
1056 ctx
->Light
.ClampVertexColor
= clamp
;
1057 _mesa_update_clamp_vertex_color(ctx
, ctx
->DrawBuffer
);
1059 case GL_CLAMP_FRAGMENT_COLOR_ARB
:
1060 if (ctx
->API
== API_OPENGL_CORE
)
1062 FLUSH_VERTICES(ctx
, _NEW_FRAG_CLAMP
);
1063 ctx
->Color
.ClampFragmentColor
= clamp
;
1064 _mesa_update_clamp_fragment_color(ctx
, ctx
->DrawBuffer
);
1066 case GL_CLAMP_READ_COLOR_ARB
:
1067 ctx
->Color
.ClampReadColor
= clamp
;
1075 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClampColor(%s)",
1076 _mesa_enum_to_string(target
));
1080 get_clamp_color(const struct gl_framebuffer
*fb
, GLenum clamp
)
1082 if (clamp
== GL_TRUE
|| clamp
== GL_FALSE
)
1085 assert(clamp
== GL_FIXED_ONLY
);
1089 return fb
->_AllColorBuffersFixedPoint
;
1093 _mesa_get_clamp_fragment_color(const struct gl_context
*ctx
,
1094 const struct gl_framebuffer
*drawFb
)
1096 return get_clamp_color(drawFb
, ctx
->Color
.ClampFragmentColor
);
1100 _mesa_get_clamp_vertex_color(const struct gl_context
*ctx
,
1101 const struct gl_framebuffer
*drawFb
)
1103 return get_clamp_color(drawFb
, ctx
->Light
.ClampVertexColor
);
1107 _mesa_get_clamp_read_color(const struct gl_context
*ctx
,
1108 const struct gl_framebuffer
*readFb
)
1110 return get_clamp_color(readFb
, ctx
->Color
.ClampReadColor
);
1114 * Update the ctx->Color._ClampFragmentColor field
1117 _mesa_update_clamp_fragment_color(struct gl_context
*ctx
,
1118 const struct gl_framebuffer
*drawFb
)
1121 * - there is no colorbuffer
1122 * - all colorbuffers are unsigned normalized, so clamping has no effect
1123 * - there is an integer colorbuffer
1125 if (!drawFb
|| !drawFb
->_HasSNormOrFloatColorBuffer
||
1126 drawFb
->_IntegerBuffers
)
1127 ctx
->Color
._ClampFragmentColor
= GL_FALSE
;
1129 ctx
->Color
._ClampFragmentColor
=
1130 _mesa_get_clamp_fragment_color(ctx
, drawFb
);
1134 * Update the ctx->Color._ClampVertexColor field
1137 _mesa_update_clamp_vertex_color(struct gl_context
*ctx
,
1138 const struct gl_framebuffer
*drawFb
)
1140 ctx
->Light
._ClampVertexColor
=
1141 _mesa_get_clamp_vertex_color(ctx
, drawFb
);
1145 * Returns an appropriate mesa_format for color rendering based on the
1146 * GL_FRAMEBUFFER_SRGB state.
1148 * Some drivers implement GL_FRAMEBUFFER_SRGB using a flag on the blend state
1149 * (which GL_FRAMEBUFFER_SRGB maps to reasonably), but some have to do so by
1150 * overriding the format of the surface. This is a helper for doing the
1151 * surface format override variant.
1154 _mesa_get_render_format(const struct gl_context
*ctx
, mesa_format format
)
1156 if (ctx
->Color
.sRGBEnabled
)
1159 return _mesa_get_srgb_format_linear(format
);
1162 /**********************************************************************/
1163 /** \name Initialization */
1167 * Initialization of the context's Color attribute group.
1169 * \param ctx GL context.
1171 * Initializes the related fields in the context color attribute group,
1172 * __struct gl_contextRec::Color.
1174 void _mesa_init_color( struct gl_context
* ctx
)
1178 /* Color buffer group */
1179 ctx
->Color
.IndexMask
= ~0u;
1180 ctx
->Color
.ColorMask
= 0xffffffff;
1181 ctx
->Color
.ClearIndex
= 0;
1182 ASSIGN_4V( ctx
->Color
.ClearColor
.f
, 0, 0, 0, 0 );
1183 ctx
->Color
.AlphaEnabled
= GL_FALSE
;
1184 ctx
->Color
.AlphaFunc
= GL_ALWAYS
;
1185 ctx
->Color
.AlphaRef
= 0;
1186 ctx
->Color
.BlendEnabled
= 0x0;
1187 for (i
= 0; i
< ARRAY_SIZE(ctx
->Color
.Blend
); i
++) {
1188 ctx
->Color
.Blend
[i
].SrcRGB
= GL_ONE
;
1189 ctx
->Color
.Blend
[i
].DstRGB
= GL_ZERO
;
1190 ctx
->Color
.Blend
[i
].SrcA
= GL_ONE
;
1191 ctx
->Color
.Blend
[i
].DstA
= GL_ZERO
;
1192 ctx
->Color
.Blend
[i
].EquationRGB
= GL_FUNC_ADD
;
1193 ctx
->Color
.Blend
[i
].EquationA
= GL_FUNC_ADD
;
1195 ASSIGN_4V( ctx
->Color
.BlendColor
, 0.0, 0.0, 0.0, 0.0 );
1196 ASSIGN_4V( ctx
->Color
.BlendColorUnclamped
, 0.0, 0.0, 0.0, 0.0 );
1197 ctx
->Color
.IndexLogicOpEnabled
= GL_FALSE
;
1198 ctx
->Color
.ColorLogicOpEnabled
= GL_FALSE
;
1199 ctx
->Color
.LogicOp
= GL_COPY
;
1200 ctx
->Color
._LogicOp
= COLOR_LOGICOP_COPY
;
1201 ctx
->Color
.DitherFlag
= GL_TRUE
;
1203 /* GL_FRONT is not possible on GLES. Instead GL_BACK will render to either
1204 * the front or the back buffer depending on the config */
1205 if (ctx
->Visual
.doubleBufferMode
|| _mesa_is_gles(ctx
)) {
1206 ctx
->Color
.DrawBuffer
[0] = GL_BACK
;
1209 ctx
->Color
.DrawBuffer
[0] = GL_FRONT
;
1212 ctx
->Color
.ClampFragmentColor
= ctx
->API
== API_OPENGL_COMPAT
?
1213 GL_FIXED_ONLY_ARB
: GL_FALSE
;
1214 ctx
->Color
._ClampFragmentColor
= GL_FALSE
;
1215 ctx
->Color
.ClampReadColor
= GL_FIXED_ONLY_ARB
;
1217 /* GLES 1/2/3 behaves as though GL_FRAMEBUFFER_SRGB is always enabled
1218 * if EGL_KHR_gl_colorspace has been used to request sRGB.
1220 ctx
->Color
.sRGBEnabled
= _mesa_is_gles(ctx
);
1222 ctx
->Color
.BlendCoherent
= true;