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/blend.h"
44 #include "main/macros.h"
47 * Convert GLenum blend tokens to pipe tokens.
48 * Both blend factors and blend funcs are accepted.
51 translate_blend(GLenum blend
)
56 return PIPE_BLEND_ADD
;
57 case GL_FUNC_SUBTRACT
:
58 return PIPE_BLEND_SUBTRACT
;
59 case GL_FUNC_REVERSE_SUBTRACT
:
60 return PIPE_BLEND_REVERSE_SUBTRACT
;
62 return PIPE_BLEND_MIN
;
64 return PIPE_BLEND_MAX
;
68 return PIPE_BLENDFACTOR_ONE
;
70 return PIPE_BLENDFACTOR_SRC_COLOR
;
72 return PIPE_BLENDFACTOR_SRC_ALPHA
;
74 return PIPE_BLENDFACTOR_DST_ALPHA
;
76 return PIPE_BLENDFACTOR_DST_COLOR
;
77 case GL_SRC_ALPHA_SATURATE
:
78 return PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE
;
79 case GL_CONSTANT_COLOR
:
80 return PIPE_BLENDFACTOR_CONST_COLOR
;
81 case GL_CONSTANT_ALPHA
:
82 return PIPE_BLENDFACTOR_CONST_ALPHA
;
84 return PIPE_BLENDFACTOR_SRC1_COLOR
;
86 return PIPE_BLENDFACTOR_SRC1_ALPHA
;
88 return PIPE_BLENDFACTOR_ZERO
;
89 case GL_ONE_MINUS_SRC_COLOR
:
90 return PIPE_BLENDFACTOR_INV_SRC_COLOR
;
91 case GL_ONE_MINUS_SRC_ALPHA
:
92 return PIPE_BLENDFACTOR_INV_SRC_ALPHA
;
93 case GL_ONE_MINUS_DST_COLOR
:
94 return PIPE_BLENDFACTOR_INV_DST_COLOR
;
95 case GL_ONE_MINUS_DST_ALPHA
:
96 return PIPE_BLENDFACTOR_INV_DST_ALPHA
;
97 case GL_ONE_MINUS_CONSTANT_COLOR
:
98 return PIPE_BLENDFACTOR_INV_CONST_COLOR
;
99 case GL_ONE_MINUS_CONSTANT_ALPHA
:
100 return PIPE_BLENDFACTOR_INV_CONST_ALPHA
;
101 case GL_ONE_MINUS_SRC1_COLOR
:
102 return PIPE_BLENDFACTOR_INV_SRC1_COLOR
;
103 case GL_ONE_MINUS_SRC1_ALPHA
:
104 return PIPE_BLENDFACTOR_INV_SRC1_ALPHA
;
106 assert("invalid GL token in translate_blend()" == NULL
);
112 * Figure out if colormasks are different per rt.
115 colormask_per_rt(const struct gl_context
*ctx
)
117 GLbitfield repl_mask0
=
118 _mesa_replicate_colormask(GET_COLORMASK(ctx
->Color
.ColorMask
, 0),
119 ctx
->Const
.MaxDrawBuffers
);
121 return ctx
->Color
.ColorMask
!= repl_mask0
;
125 * Figure out if blend enables/state are different per rt.
128 blend_per_rt(const struct gl_context
*ctx
)
130 if (ctx
->Color
.BlendEnabled
&&
131 (ctx
->Color
.BlendEnabled
!= ((1U << ctx
->Const
.MaxDrawBuffers
) - 1))) {
132 /* This can only happen if GL_EXT_draw_buffers2 is enabled */
135 if (ctx
->Color
._BlendFuncPerBuffer
|| ctx
->Color
._BlendEquationPerBuffer
) {
136 /* this can only happen if GL_ARB_draw_buffers_blend is enabled */
143 st_update_blend( struct st_context
*st
)
145 struct pipe_blend_state
*blend
= &st
->state
.blend
;
146 const struct gl_context
*ctx
= st
->ctx
;
147 unsigned num_state
= 1;
150 memset(blend
, 0, sizeof(*blend
));
152 if (blend_per_rt(ctx
) || colormask_per_rt(ctx
)) {
153 num_state
= ctx
->Const
.MaxDrawBuffers
;
154 blend
->independent_blend_enable
= 1;
156 if (ctx
->Color
.ColorLogicOpEnabled
) {
157 /* logicop enabled */
158 blend
->logicop_enable
= 1;
159 blend
->logicop_func
= ctx
->Color
._LogicOp
;
161 else if (ctx
->Color
.BlendEnabled
&& !ctx
->Color
._AdvancedBlendMode
) {
162 /* blending enabled */
163 for (i
= 0, j
= 0; i
< num_state
; i
++) {
164 if (!(ctx
->Color
.BlendEnabled
& (1 << i
)))
167 if (ctx
->Extensions
.ARB_draw_buffers_blend
)
170 blend
->rt
[i
].blend_enable
= 1;
171 blend
->rt
[i
].rgb_func
=
172 translate_blend(ctx
->Color
.Blend
[j
].EquationRGB
);
174 if (ctx
->Color
.Blend
[i
].EquationRGB
== GL_MIN
||
175 ctx
->Color
.Blend
[i
].EquationRGB
== GL_MAX
) {
176 /* Min/max are special */
177 blend
->rt
[i
].rgb_src_factor
= PIPE_BLENDFACTOR_ONE
;
178 blend
->rt
[i
].rgb_dst_factor
= PIPE_BLENDFACTOR_ONE
;
181 blend
->rt
[i
].rgb_src_factor
=
182 translate_blend(ctx
->Color
.Blend
[j
].SrcRGB
);
183 blend
->rt
[i
].rgb_dst_factor
=
184 translate_blend(ctx
->Color
.Blend
[j
].DstRGB
);
187 blend
->rt
[i
].alpha_func
=
188 translate_blend(ctx
->Color
.Blend
[j
].EquationA
);
190 if (ctx
->Color
.Blend
[i
].EquationA
== GL_MIN
||
191 ctx
->Color
.Blend
[i
].EquationA
== GL_MAX
) {
192 /* Min/max are special */
193 blend
->rt
[i
].alpha_src_factor
= PIPE_BLENDFACTOR_ONE
;
194 blend
->rt
[i
].alpha_dst_factor
= PIPE_BLENDFACTOR_ONE
;
197 blend
->rt
[i
].alpha_src_factor
=
198 translate_blend(ctx
->Color
.Blend
[j
].SrcA
);
199 blend
->rt
[i
].alpha_dst_factor
=
200 translate_blend(ctx
->Color
.Blend
[j
].DstA
);
205 /* no blending / logicop */
208 for (i
= 0; i
< num_state
; i
++)
209 blend
->rt
[i
].colormask
= GET_COLORMASK(ctx
->Color
.ColorMask
, i
);
211 blend
->dither
= ctx
->Color
.DitherFlag
;
213 if (_mesa_is_multisample_enabled(ctx
) &&
214 !(ctx
->DrawBuffer
->_IntegerBuffers
& 0x1)) {
215 /* Unlike in gallium/d3d10 these operations are only performed
216 * if both msaa is enabled and we have a multisample buffer.
218 blend
->alpha_to_coverage
= ctx
->Multisample
.SampleAlphaToCoverage
;
219 blend
->alpha_to_one
= ctx
->Multisample
.SampleAlphaToOne
;
222 cso_set_blend(st
->cso_context
, blend
);
226 st_update_blend_color(struct st_context
*st
)
228 struct pipe_blend_color bc
;
230 COPY_4FV(bc
.color
, st
->ctx
->Color
.BlendColorUnclamped
);
231 cso_set_blend_color(st
->cso_context
, &bc
);