1 /**************************************************************************
3 * Copyright 2007 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
30 * Keith Whitwell <keithw@vmware.com>
35 #include "st_context.h"
38 #include "pipe/p_context.h"
39 #include "pipe/p_defines.h"
40 #include "cso_cache/cso_context.h"
42 #include "framebuffer.h"
43 #include "main/macros.h"
46 * Convert GLenum blend tokens to pipe tokens.
47 * Both blend factors and blend funcs are accepted.
50 translate_blend(GLenum blend
)
55 return PIPE_BLEND_ADD
;
56 case GL_FUNC_SUBTRACT
:
57 return PIPE_BLEND_SUBTRACT
;
58 case GL_FUNC_REVERSE_SUBTRACT
:
59 return PIPE_BLEND_REVERSE_SUBTRACT
;
61 return PIPE_BLEND_MIN
;
63 return PIPE_BLEND_MAX
;
67 return PIPE_BLENDFACTOR_ONE
;
69 return PIPE_BLENDFACTOR_SRC_COLOR
;
71 return PIPE_BLENDFACTOR_SRC_ALPHA
;
73 return PIPE_BLENDFACTOR_DST_ALPHA
;
75 return PIPE_BLENDFACTOR_DST_COLOR
;
76 case GL_SRC_ALPHA_SATURATE
:
77 return PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE
;
78 case GL_CONSTANT_COLOR
:
79 return PIPE_BLENDFACTOR_CONST_COLOR
;
80 case GL_CONSTANT_ALPHA
:
81 return PIPE_BLENDFACTOR_CONST_ALPHA
;
83 return PIPE_BLENDFACTOR_SRC1_COLOR
;
85 return PIPE_BLENDFACTOR_SRC1_ALPHA
;
87 return PIPE_BLENDFACTOR_ZERO
;
88 case GL_ONE_MINUS_SRC_COLOR
:
89 return PIPE_BLENDFACTOR_INV_SRC_COLOR
;
90 case GL_ONE_MINUS_SRC_ALPHA
:
91 return PIPE_BLENDFACTOR_INV_SRC_ALPHA
;
92 case GL_ONE_MINUS_DST_COLOR
:
93 return PIPE_BLENDFACTOR_INV_DST_COLOR
;
94 case GL_ONE_MINUS_DST_ALPHA
:
95 return PIPE_BLENDFACTOR_INV_DST_ALPHA
;
96 case GL_ONE_MINUS_CONSTANT_COLOR
:
97 return PIPE_BLENDFACTOR_INV_CONST_COLOR
;
98 case GL_ONE_MINUS_CONSTANT_ALPHA
:
99 return PIPE_BLENDFACTOR_INV_CONST_ALPHA
;
100 case GL_ONE_MINUS_SRC1_COLOR
:
101 return PIPE_BLENDFACTOR_INV_SRC1_COLOR
;
102 case GL_ONE_MINUS_SRC1_ALPHA
:
103 return PIPE_BLENDFACTOR_INV_SRC1_ALPHA
;
105 assert("invalid GL token in translate_blend()" == NULL
);
112 * Convert GLenum logicop tokens to pipe tokens.
115 translate_logicop(GLenum logicop
)
119 return PIPE_LOGICOP_CLEAR
;
121 return PIPE_LOGICOP_NOR
;
122 case GL_AND_INVERTED
:
123 return PIPE_LOGICOP_AND_INVERTED
;
124 case GL_COPY_INVERTED
:
125 return PIPE_LOGICOP_COPY_INVERTED
;
127 return PIPE_LOGICOP_AND_REVERSE
;
129 return PIPE_LOGICOP_INVERT
;
131 return PIPE_LOGICOP_XOR
;
133 return PIPE_LOGICOP_NAND
;
135 return PIPE_LOGICOP_AND
;
137 return PIPE_LOGICOP_EQUIV
;
139 return PIPE_LOGICOP_NOOP
;
141 return PIPE_LOGICOP_OR_INVERTED
;
143 return PIPE_LOGICOP_COPY
;
145 return PIPE_LOGICOP_OR_REVERSE
;
147 return PIPE_LOGICOP_OR
;
149 return PIPE_LOGICOP_SET
;
151 assert("invalid GL token in translate_logicop()" == NULL
);
157 * Figure out if colormasks are different per rt.
160 colormask_per_rt(const struct gl_context
*ctx
)
162 /* a bit suboptimal have to compare lots of values */
164 for (i
= 1; i
< ctx
->Const
.MaxDrawBuffers
; i
++) {
165 if (memcmp(ctx
->Color
.ColorMask
[0], ctx
->Color
.ColorMask
[i
], 4)) {
173 * Figure out if blend enables/state are different per rt.
176 blend_per_rt(const struct gl_context
*ctx
)
178 if (ctx
->Color
.BlendEnabled
&&
179 (ctx
->Color
.BlendEnabled
!= ((1U << ctx
->Const
.MaxDrawBuffers
) - 1))) {
180 /* This can only happen if GL_EXT_draw_buffers2 is enabled */
183 if (ctx
->Color
._BlendFuncPerBuffer
|| ctx
->Color
._BlendEquationPerBuffer
) {
184 /* this can only happen if GL_ARB_draw_buffers_blend is enabled */
191 st_update_blend( struct st_context
*st
)
193 struct pipe_blend_state
*blend
= &st
->state
.blend
;
194 const struct gl_context
*ctx
= st
->ctx
;
195 unsigned num_state
= 1;
198 memset(blend
, 0, sizeof(*blend
));
200 if (blend_per_rt(ctx
) || colormask_per_rt(ctx
)) {
201 num_state
= ctx
->Const
.MaxDrawBuffers
;
202 blend
->independent_blend_enable
= 1;
204 if (ctx
->Color
.ColorLogicOpEnabled
) {
205 /* logicop enabled */
206 blend
->logicop_enable
= 1;
207 blend
->logicop_func
= translate_logicop(ctx
->Color
.LogicOp
);
209 else if (ctx
->Color
.BlendEnabled
&& !ctx
->Color
._AdvancedBlendMode
) {
210 /* blending enabled */
211 for (i
= 0, j
= 0; i
< num_state
; i
++) {
213 blend
->rt
[i
].blend_enable
= (ctx
->Color
.BlendEnabled
>> i
) & 0x1;
215 if (ctx
->Extensions
.ARB_draw_buffers_blend
)
218 blend
->rt
[i
].rgb_func
=
219 translate_blend(ctx
->Color
.Blend
[j
].EquationRGB
);
221 if (ctx
->Color
.Blend
[i
].EquationRGB
== GL_MIN
||
222 ctx
->Color
.Blend
[i
].EquationRGB
== GL_MAX
) {
223 /* Min/max are special */
224 blend
->rt
[i
].rgb_src_factor
= PIPE_BLENDFACTOR_ONE
;
225 blend
->rt
[i
].rgb_dst_factor
= PIPE_BLENDFACTOR_ONE
;
228 blend
->rt
[i
].rgb_src_factor
=
229 translate_blend(ctx
->Color
.Blend
[j
].SrcRGB
);
230 blend
->rt
[i
].rgb_dst_factor
=
231 translate_blend(ctx
->Color
.Blend
[j
].DstRGB
);
234 blend
->rt
[i
].alpha_func
=
235 translate_blend(ctx
->Color
.Blend
[j
].EquationA
);
237 if (ctx
->Color
.Blend
[i
].EquationA
== GL_MIN
||
238 ctx
->Color
.Blend
[i
].EquationA
== GL_MAX
) {
239 /* Min/max are special */
240 blend
->rt
[i
].alpha_src_factor
= PIPE_BLENDFACTOR_ONE
;
241 blend
->rt
[i
].alpha_dst_factor
= PIPE_BLENDFACTOR_ONE
;
244 blend
->rt
[i
].alpha_src_factor
=
245 translate_blend(ctx
->Color
.Blend
[j
].SrcA
);
246 blend
->rt
[i
].alpha_dst_factor
=
247 translate_blend(ctx
->Color
.Blend
[j
].DstA
);
252 /* no blending / logicop */
255 /* Colormask - maybe reverse these bits? */
256 for (i
= 0; i
< num_state
; i
++) {
257 if (ctx
->Color
.ColorMask
[i
][0])
258 blend
->rt
[i
].colormask
|= PIPE_MASK_R
;
259 if (ctx
->Color
.ColorMask
[i
][1])
260 blend
->rt
[i
].colormask
|= PIPE_MASK_G
;
261 if (ctx
->Color
.ColorMask
[i
][2])
262 blend
->rt
[i
].colormask
|= PIPE_MASK_B
;
263 if (ctx
->Color
.ColorMask
[i
][3])
264 blend
->rt
[i
].colormask
|= PIPE_MASK_A
;
267 blend
->dither
= ctx
->Color
.DitherFlag
;
269 if (_mesa_is_multisample_enabled(ctx
) &&
270 !(ctx
->DrawBuffer
->_IntegerBuffers
& 0x1)) {
271 /* Unlike in gallium/d3d10 these operations are only performed
272 * if both msaa is enabled and we have a multisample buffer.
274 blend
->alpha_to_coverage
= ctx
->Multisample
.SampleAlphaToCoverage
;
275 blend
->alpha_to_one
= ctx
->Multisample
.SampleAlphaToOne
;
278 cso_set_blend(st
->cso_context
, blend
);
282 st_update_blend_color(struct st_context
*st
)
284 struct pipe_blend_color bc
;
286 COPY_4FV(bc
.color
, st
->ctx
->Color
.BlendColorUnclamped
);
287 cso_set_blend_color(st
->cso_context
, &bc
);