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 * Check if given blend equation is legal.
340 * \return GL_TRUE if legal, GL_FALSE otherwise.
343 legal_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
;
359 /* This is really an extension function! */
361 _mesa_BlendEquation( GLenum mode
)
363 GET_CURRENT_CONTEXT(ctx
);
364 const unsigned numBuffers
= num_buffers(ctx
);
366 bool changed
= false;
368 if (MESA_VERBOSE
& VERBOSE_API
)
369 _mesa_debug(ctx
, "glBlendEquation(%s)\n",
370 _mesa_enum_to_string(mode
));
372 if (ctx
->Color
._BlendEquationPerBuffer
) {
373 /* Check all per-buffer states */
374 for (buf
= 0; buf
< numBuffers
; buf
++) {
375 if (ctx
->Color
.Blend
[buf
].EquationRGB
!= mode
||
376 ctx
->Color
.Blend
[buf
].EquationA
!= mode
) {
383 /* only need to check 0th per-buffer state */
384 if (ctx
->Color
.Blend
[0].EquationRGB
!= mode
||
385 ctx
->Color
.Blend
[0].EquationA
!= mode
) {
393 if (!legal_blend_equation(ctx
, mode
)) {
394 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquation");
398 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
400 for (buf
= 0; buf
< numBuffers
; buf
++) {
401 ctx
->Color
.Blend
[buf
].EquationRGB
= mode
;
402 ctx
->Color
.Blend
[buf
].EquationA
= mode
;
404 ctx
->Color
._BlendEquationPerBuffer
= GL_FALSE
;
406 if (ctx
->Driver
.BlendEquationSeparate
)
407 ctx
->Driver
.BlendEquationSeparate(ctx
, mode
, mode
);
412 * Set blend equation for one color buffer/target.
415 _mesa_BlendEquationiARB(GLuint buf
, GLenum mode
)
417 GET_CURRENT_CONTEXT(ctx
);
419 if (MESA_VERBOSE
& VERBOSE_API
)
420 _mesa_debug(ctx
, "glBlendEquationi(%u, %s)\n",
421 buf
, _mesa_enum_to_string(mode
));
423 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
424 _mesa_error(ctx
, GL_INVALID_VALUE
, "glBlendEquationi(buffer=%u)",
429 if (!legal_blend_equation(ctx
, mode
)) {
430 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationi");
434 if (ctx
->Color
.Blend
[buf
].EquationRGB
== mode
&&
435 ctx
->Color
.Blend
[buf
].EquationA
== mode
)
436 return; /* no change */
438 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
439 ctx
->Color
.Blend
[buf
].EquationRGB
= mode
;
440 ctx
->Color
.Blend
[buf
].EquationA
= mode
;
441 ctx
->Color
._BlendEquationPerBuffer
= GL_TRUE
;
446 _mesa_BlendEquationSeparate( GLenum modeRGB
, GLenum modeA
)
448 GET_CURRENT_CONTEXT(ctx
);
449 const unsigned numBuffers
= num_buffers(ctx
);
451 bool changed
= false;
453 if (MESA_VERBOSE
& VERBOSE_API
)
454 _mesa_debug(ctx
, "glBlendEquationSeparateEXT(%s %s)\n",
455 _mesa_enum_to_string(modeRGB
),
456 _mesa_enum_to_string(modeA
));
458 if (ctx
->Color
._BlendEquationPerBuffer
) {
459 /* Check all per-buffer states */
460 for (buf
= 0; buf
< numBuffers
; buf
++) {
461 if (ctx
->Color
.Blend
[buf
].EquationRGB
!= modeRGB
||
462 ctx
->Color
.Blend
[buf
].EquationA
!= modeA
) {
469 /* only need to check 0th per-buffer state */
470 if (ctx
->Color
.Blend
[0].EquationRGB
!= modeRGB
||
471 ctx
->Color
.Blend
[0].EquationA
!= modeA
) {
479 if ( (modeRGB
!= modeA
) && !ctx
->Extensions
.EXT_blend_equation_separate
) {
480 _mesa_error(ctx
, GL_INVALID_OPERATION
,
481 "glBlendEquationSeparateEXT not supported by driver");
485 if (!legal_blend_equation(ctx
, modeRGB
)) {
486 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparateEXT(modeRGB)");
490 if (!legal_blend_equation(ctx
, modeA
)) {
491 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparateEXT(modeA)");
495 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
497 for (buf
= 0; buf
< numBuffers
; buf
++) {
498 ctx
->Color
.Blend
[buf
].EquationRGB
= modeRGB
;
499 ctx
->Color
.Blend
[buf
].EquationA
= modeA
;
501 ctx
->Color
._BlendEquationPerBuffer
= GL_FALSE
;
503 if (ctx
->Driver
.BlendEquationSeparate
)
504 ctx
->Driver
.BlendEquationSeparate(ctx
, modeRGB
, modeA
);
509 * Set separate blend equations for one color buffer/target.
512 _mesa_BlendEquationSeparateiARB(GLuint buf
, GLenum modeRGB
, GLenum modeA
)
514 GET_CURRENT_CONTEXT(ctx
);
516 if (MESA_VERBOSE
& VERBOSE_API
)
517 _mesa_debug(ctx
, "glBlendEquationSeparatei(%u, %s %s)\n", buf
,
518 _mesa_enum_to_string(modeRGB
),
519 _mesa_enum_to_string(modeA
));
521 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
522 _mesa_error(ctx
, GL_INVALID_VALUE
, "glBlendEquationSeparatei(buffer=%u)",
527 if (!legal_blend_equation(ctx
, modeRGB
)) {
528 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparatei(modeRGB)");
532 if (!legal_blend_equation(ctx
, modeA
)) {
533 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBlendEquationSeparatei(modeA)");
537 if (ctx
->Color
.Blend
[buf
].EquationRGB
== modeRGB
&&
538 ctx
->Color
.Blend
[buf
].EquationA
== modeA
)
539 return; /* no change */
541 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
542 ctx
->Color
.Blend
[buf
].EquationRGB
= modeRGB
;
543 ctx
->Color
.Blend
[buf
].EquationA
= modeA
;
544 ctx
->Color
._BlendEquationPerBuffer
= GL_TRUE
;
549 * Set the blending color.
551 * \param red red color component.
552 * \param green green color component.
553 * \param blue blue color component.
554 * \param alpha alpha color component.
556 * \sa glBlendColor().
558 * Clamps the parameters and updates gl_colorbuffer_attrib::BlendColor. On a
559 * change, flushes the vertices and notifies the driver via
560 * dd_function_table::BlendColor callback.
563 _mesa_BlendColor( GLclampf red
, GLclampf green
, GLclampf blue
, GLclampf alpha
)
566 GET_CURRENT_CONTEXT(ctx
);
573 if (TEST_EQ_4V(tmp
, ctx
->Color
.BlendColorUnclamped
))
576 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
577 COPY_4FV( ctx
->Color
.BlendColorUnclamped
, tmp
);
579 ctx
->Color
.BlendColor
[0] = CLAMP(tmp
[0], 0.0F
, 1.0F
);
580 ctx
->Color
.BlendColor
[1] = CLAMP(tmp
[1], 0.0F
, 1.0F
);
581 ctx
->Color
.BlendColor
[2] = CLAMP(tmp
[2], 0.0F
, 1.0F
);
582 ctx
->Color
.BlendColor
[3] = CLAMP(tmp
[3], 0.0F
, 1.0F
);
584 if (ctx
->Driver
.BlendColor
)
585 ctx
->Driver
.BlendColor(ctx
, ctx
->Color
.BlendColor
);
590 * Specify the alpha test function.
592 * \param func alpha comparison function.
593 * \param ref reference value.
595 * Verifies the parameters and updates gl_colorbuffer_attrib.
596 * On a change, flushes the vertices and notifies the driver via
597 * dd_function_table::AlphaFunc callback.
600 _mesa_AlphaFunc( GLenum func
, GLclampf ref
)
602 GET_CURRENT_CONTEXT(ctx
);
604 if (MESA_VERBOSE
& VERBOSE_API
)
605 _mesa_debug(ctx
, "glAlphaFunc(%s, %f)\n",
606 _mesa_enum_to_string(func
), ref
);
608 if (ctx
->Color
.AlphaFunc
== func
&& ctx
->Color
.AlphaRefUnclamped
== ref
)
609 return; /* no change */
620 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
621 ctx
->Color
.AlphaFunc
= func
;
622 ctx
->Color
.AlphaRefUnclamped
= ref
;
623 ctx
->Color
.AlphaRef
= CLAMP(ref
, 0.0F
, 1.0F
);
625 if (ctx
->Driver
.AlphaFunc
)
626 ctx
->Driver
.AlphaFunc(ctx
, func
, ctx
->Color
.AlphaRef
);
630 _mesa_error( ctx
, GL_INVALID_ENUM
, "glAlphaFunc(func)" );
637 * Specify a logic pixel operation for color index rendering.
639 * \param opcode operation.
641 * Verifies that \p opcode is a valid enum and updates
642 * gl_colorbuffer_attrib::LogicOp.
643 * On a change, flushes the vertices and notifies the driver via the
644 * dd_function_table::LogicOpcode callback.
647 _mesa_LogicOp( GLenum opcode
)
649 GET_CURRENT_CONTEXT(ctx
);
651 if (MESA_VERBOSE
& VERBOSE_API
)
652 _mesa_debug(ctx
, "glLogicOp(%s)\n", _mesa_enum_to_string(opcode
));
658 case GL_COPY_INVERTED
:
668 case GL_AND_INVERTED
:
673 _mesa_error( ctx
, GL_INVALID_ENUM
, "glLogicOp" );
677 if (ctx
->Color
.LogicOp
== opcode
)
680 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
681 ctx
->Color
.LogicOp
= opcode
;
683 if (ctx
->Driver
.LogicOpcode
)
684 ctx
->Driver
.LogicOpcode( ctx
, opcode
);
689 _mesa_IndexMask( GLuint mask
)
691 GET_CURRENT_CONTEXT(ctx
);
693 if (ctx
->Color
.IndexMask
== mask
)
696 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
697 ctx
->Color
.IndexMask
= mask
;
702 * Enable or disable writing of frame buffer color components.
704 * \param red whether to mask writing of the red color component.
705 * \param green whether to mask writing of the green color component.
706 * \param blue whether to mask writing of the blue color component.
707 * \param alpha whether to mask writing of the alpha color component.
711 * Sets the appropriate value of gl_colorbuffer_attrib::ColorMask. On a
712 * change, flushes the vertices and notifies the driver via the
713 * dd_function_table::ColorMask callback.
716 _mesa_ColorMask( GLboolean red
, GLboolean green
,
717 GLboolean blue
, GLboolean alpha
)
719 GET_CURRENT_CONTEXT(ctx
);
724 if (MESA_VERBOSE
& VERBOSE_API
)
725 _mesa_debug(ctx
, "glColorMask(%d, %d, %d, %d)\n",
726 red
, green
, blue
, alpha
);
728 /* Shouldn't have any information about channel depth in core mesa
729 * -- should probably store these as the native booleans:
731 tmp
[RCOMP
] = red
? 0xff : 0x0;
732 tmp
[GCOMP
] = green
? 0xff : 0x0;
733 tmp
[BCOMP
] = blue
? 0xff : 0x0;
734 tmp
[ACOMP
] = alpha
? 0xff : 0x0;
737 for (i
= 0; i
< ctx
->Const
.MaxDrawBuffers
; i
++) {
738 if (!TEST_EQ_4V(tmp
, ctx
->Color
.ColorMask
[i
])) {
740 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
743 COPY_4UBV(ctx
->Color
.ColorMask
[i
], tmp
);
747 if (ctx
->Driver
.ColorMask
)
748 ctx
->Driver
.ColorMask( ctx
, red
, green
, blue
, alpha
);
753 * For GL_EXT_draw_buffers2 and GL3
756 _mesa_ColorMaski( GLuint buf
, GLboolean red
, GLboolean green
,
757 GLboolean blue
, GLboolean alpha
)
760 GET_CURRENT_CONTEXT(ctx
);
762 if (MESA_VERBOSE
& VERBOSE_API
)
763 _mesa_debug(ctx
, "glColorMaskIndexed %u %d %d %d %d\n",
764 buf
, red
, green
, blue
, alpha
);
766 if (buf
>= ctx
->Const
.MaxDrawBuffers
) {
767 _mesa_error(ctx
, GL_INVALID_VALUE
, "glColorMaskIndexed(buf=%u)", buf
);
771 /* Shouldn't have any information about channel depth in core mesa
772 * -- should probably store these as the native booleans:
774 tmp
[RCOMP
] = red
? 0xff : 0x0;
775 tmp
[GCOMP
] = green
? 0xff : 0x0;
776 tmp
[BCOMP
] = blue
? 0xff : 0x0;
777 tmp
[ACOMP
] = alpha
? 0xff : 0x0;
779 if (TEST_EQ_4V(tmp
, ctx
->Color
.ColorMask
[buf
]))
782 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
783 COPY_4UBV(ctx
->Color
.ColorMask
[buf
], tmp
);
788 _mesa_ClampColor(GLenum target
, GLenum clamp
)
790 GET_CURRENT_CONTEXT(ctx
);
792 if (clamp
!= GL_TRUE
&& clamp
!= GL_FALSE
&& clamp
!= GL_FIXED_ONLY_ARB
) {
793 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClampColorARB(clamp)");
798 case GL_CLAMP_VERTEX_COLOR_ARB
:
799 if (ctx
->API
== API_OPENGL_CORE
&&
800 !ctx
->Extensions
.ARB_color_buffer_float
) {
803 FLUSH_VERTICES(ctx
, _NEW_LIGHT
);
804 ctx
->Light
.ClampVertexColor
= clamp
;
805 _mesa_update_clamp_vertex_color(ctx
, ctx
->DrawBuffer
);
807 case GL_CLAMP_FRAGMENT_COLOR_ARB
:
808 if (ctx
->API
== API_OPENGL_CORE
&&
809 !ctx
->Extensions
.ARB_color_buffer_float
) {
812 FLUSH_VERTICES(ctx
, _NEW_FRAG_CLAMP
);
813 ctx
->Color
.ClampFragmentColor
= clamp
;
814 _mesa_update_clamp_fragment_color(ctx
, ctx
->DrawBuffer
);
816 case GL_CLAMP_READ_COLOR_ARB
:
817 ctx
->Color
.ClampReadColor
= clamp
;
825 _mesa_error(ctx
, GL_INVALID_ENUM
, "glClampColor(%s)",
826 _mesa_enum_to_string(target
));
830 get_clamp_color(const struct gl_framebuffer
*fb
, GLenum clamp
)
832 if (clamp
== GL_TRUE
|| clamp
== GL_FALSE
)
835 assert(clamp
== GL_FIXED_ONLY
);
839 return fb
->_AllColorBuffersFixedPoint
;
843 _mesa_get_clamp_fragment_color(const struct gl_context
*ctx
,
844 const struct gl_framebuffer
*drawFb
)
846 return get_clamp_color(drawFb
, ctx
->Color
.ClampFragmentColor
);
850 _mesa_get_clamp_vertex_color(const struct gl_context
*ctx
,
851 const struct gl_framebuffer
*drawFb
)
853 return get_clamp_color(drawFb
, ctx
->Light
.ClampVertexColor
);
857 _mesa_get_clamp_read_color(const struct gl_context
*ctx
,
858 const struct gl_framebuffer
*readFb
)
860 return get_clamp_color(readFb
, ctx
->Color
.ClampReadColor
);
864 * Update the ctx->Color._ClampFragmentColor field
867 _mesa_update_clamp_fragment_color(struct gl_context
*ctx
,
868 const struct gl_framebuffer
*drawFb
)
871 * - there is no colorbuffer
872 * - all colorbuffers are unsigned normalized, so clamping has no effect
873 * - there is an integer colorbuffer
875 if (!drawFb
|| !drawFb
->_HasSNormOrFloatColorBuffer
||
876 drawFb
->_IntegerColor
)
877 ctx
->Color
._ClampFragmentColor
= GL_FALSE
;
879 ctx
->Color
._ClampFragmentColor
=
880 _mesa_get_clamp_fragment_color(ctx
, drawFb
);
884 * Update the ctx->Color._ClampVertexColor field
887 _mesa_update_clamp_vertex_color(struct gl_context
*ctx
,
888 const struct gl_framebuffer
*drawFb
)
890 ctx
->Light
._ClampVertexColor
=
891 _mesa_get_clamp_vertex_color(ctx
, drawFb
);
895 * Returns an appropriate mesa_format for color rendering based on the
896 * GL_FRAMEBUFFER_SRGB state.
898 * Some drivers implement GL_FRAMEBUFFER_SRGB using a flag on the blend state
899 * (which GL_FRAMEBUFFER_SRGB maps to reasonably), but some have to do so by
900 * overriding the format of the surface. This is a helper for doing the
901 * surface format override variant.
904 _mesa_get_render_format(const struct gl_context
*ctx
, mesa_format format
)
906 if (ctx
->Color
.sRGBEnabled
)
909 return _mesa_get_srgb_format_linear(format
);
912 /**********************************************************************/
913 /** \name Initialization */
917 * Initialization of the context's Color attribute group.
919 * \param ctx GL context.
921 * Initializes the related fields in the context color attribute group,
922 * __struct gl_contextRec::Color.
924 void _mesa_init_color( struct gl_context
* ctx
)
928 /* Color buffer group */
929 ctx
->Color
.IndexMask
= ~0u;
930 memset(ctx
->Color
.ColorMask
, 0xff, sizeof(ctx
->Color
.ColorMask
));
931 ctx
->Color
.ClearIndex
= 0;
932 ASSIGN_4V( ctx
->Color
.ClearColor
.f
, 0, 0, 0, 0 );
933 ctx
->Color
.AlphaEnabled
= GL_FALSE
;
934 ctx
->Color
.AlphaFunc
= GL_ALWAYS
;
935 ctx
->Color
.AlphaRef
= 0;
936 ctx
->Color
.BlendEnabled
= 0x0;
937 for (i
= 0; i
< ARRAY_SIZE(ctx
->Color
.Blend
); i
++) {
938 ctx
->Color
.Blend
[i
].SrcRGB
= GL_ONE
;
939 ctx
->Color
.Blend
[i
].DstRGB
= GL_ZERO
;
940 ctx
->Color
.Blend
[i
].SrcA
= GL_ONE
;
941 ctx
->Color
.Blend
[i
].DstA
= GL_ZERO
;
942 ctx
->Color
.Blend
[i
].EquationRGB
= GL_FUNC_ADD
;
943 ctx
->Color
.Blend
[i
].EquationA
= GL_FUNC_ADD
;
945 ASSIGN_4V( ctx
->Color
.BlendColor
, 0.0, 0.0, 0.0, 0.0 );
946 ASSIGN_4V( ctx
->Color
.BlendColorUnclamped
, 0.0, 0.0, 0.0, 0.0 );
947 ctx
->Color
.IndexLogicOpEnabled
= GL_FALSE
;
948 ctx
->Color
.ColorLogicOpEnabled
= GL_FALSE
;
949 ctx
->Color
.LogicOp
= GL_COPY
;
950 ctx
->Color
.DitherFlag
= GL_TRUE
;
952 /* GL_FRONT is not possible on GLES. Instead GL_BACK will render to either
953 * the front or the back buffer depending on the config */
954 if (ctx
->Visual
.doubleBufferMode
|| _mesa_is_gles(ctx
)) {
955 ctx
->Color
.DrawBuffer
[0] = GL_BACK
;
958 ctx
->Color
.DrawBuffer
[0] = GL_FRONT
;
961 ctx
->Color
.ClampFragmentColor
= ctx
->API
== API_OPENGL_COMPAT
?
962 GL_FIXED_ONLY_ARB
: GL_FALSE
;
963 ctx
->Color
._ClampFragmentColor
= GL_FALSE
;
964 ctx
->Color
.ClampReadColor
= GL_FIXED_ONLY_ARB
;
966 /* GLES 1/2/3 behaves as though GL_FRAMEBUFFER_SRGB is always enabled
967 * if EGL_KHR_gl_colorspace has been used to request sRGB.
969 ctx
->Color
.sRGBEnabled
= _mesa_is_gles(ctx
);