2 * Copyright © 2009 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
28 #include "brw_context.h"
29 #include "brw_state.h"
30 #include "brw_defines.h"
32 #include "intel_batchbuffer.h"
33 #include "main/macros.h"
36 prepare_blend_state(struct brw_context
*brw
)
38 struct gl_context
*ctx
= &brw
->intel
.ctx
;
39 struct gen6_blend_state
*blend
;
41 int nr_draw_buffers
= ctx
->DrawBuffer
->_NumColorDrawBuffers
;
44 /* We need at least one BLEND_STATE written, because we might do
45 * thread dispatch even if _NumColorDrawBuffers is 0 (for example
46 * for computed depth or alpha test), which will do an FB write
47 * with render target 0, which will reference BLEND_STATE[0] for
50 if (nr_draw_buffers
== 0 && ctx
->Color
.AlphaEnabled
)
53 size
= sizeof(*blend
) * nr_draw_buffers
;
54 blend
= brw_state_batch(brw
, AUB_TRACE_BLEND_STATE
,
55 size
, 64, &brw
->cc
.blend_state_offset
);
57 memset(blend
, 0, size
);
59 for (b
= 0; b
< nr_draw_buffers
; b
++) {
61 if (ctx
->Color
.ColorLogicOpEnabled
) {
62 struct gl_renderbuffer
*rb
= ctx
->DrawBuffer
->_ColorDrawBuffers
[b
];
64 /* Floating point RTs should have no effect from LogicOp,
65 * except for disabling of blending
67 if (_mesa_get_format_datatype(rb
->Format
) != GL_FLOAT
) {
68 blend
[b
].blend1
.logic_op_enable
= 1;
69 blend
[b
].blend1
.logic_op_func
=
70 intel_translate_logic_op(ctx
->Color
.LogicOp
);
72 } else if (ctx
->Color
.BlendEnabled
& (1 << b
)) {
73 GLenum eqRGB
= ctx
->Color
.Blend
[0].EquationRGB
;
74 GLenum eqA
= ctx
->Color
.Blend
[0].EquationA
;
75 GLenum srcRGB
= ctx
->Color
.Blend
[0].SrcRGB
;
76 GLenum dstRGB
= ctx
->Color
.Blend
[0].DstRGB
;
77 GLenum srcA
= ctx
->Color
.Blend
[0].SrcA
;
78 GLenum dstA
= ctx
->Color
.Blend
[0].DstA
;
80 if (eqRGB
== GL_MIN
|| eqRGB
== GL_MAX
) {
81 srcRGB
= dstRGB
= GL_ONE
;
84 if (eqA
== GL_MIN
|| eqA
== GL_MAX
) {
88 blend
[b
].blend0
.dest_blend_factor
= brw_translate_blend_factor(dstRGB
);
89 blend
[b
].blend0
.source_blend_factor
= brw_translate_blend_factor(srcRGB
);
90 blend
[b
].blend0
.blend_func
= brw_translate_blend_equation(eqRGB
);
92 blend
[b
].blend0
.ia_dest_blend_factor
= brw_translate_blend_factor(dstA
);
93 blend
[b
].blend0
.ia_source_blend_factor
= brw_translate_blend_factor(srcA
);
94 blend
[b
].blend0
.ia_blend_func
= brw_translate_blend_equation(eqA
);
96 blend
[b
].blend0
.blend_enable
= 1;
97 blend
[b
].blend0
.ia_blend_enable
= (srcA
!= srcRGB
||
102 /* See section 8.1.6 "Pre-Blend Color Clamping" of the
103 * SandyBridge PRM Volume 2 Part 1 for HW requirements.
105 * We do our ARB_color_buffer_float CLAMP_FRAGMENT_COLOR
106 * clamping in the fragment shader. For its clamping of
107 * blending, the spec says:
109 * "RESOLVED: For fixed-point color buffers, the inputs and
110 * the result of the blending equation are clamped. For
111 * floating-point color buffers, no clamping occurs."
113 * So, generally, we want clamping to the render target's range.
114 * And, good news, the hardware tables for both pre- and
115 * post-blend color clamping are either ignored, or any are
116 * allowed, or clamping is required but RT range clamping is a
119 blend
[b
].blend1
.pre_blend_clamp_enable
= 1;
120 blend
[b
].blend1
.post_blend_clamp_enable
= 1;
121 blend
[b
].blend1
.clamp_range
= BRW_RENDERTARGET_CLAMPRANGE_FORMAT
;
124 if (ctx
->Color
.AlphaEnabled
) {
125 blend
[b
].blend1
.alpha_test_enable
= 1;
126 blend
[b
].blend1
.alpha_test_func
=
127 intel_translate_compare_func(ctx
->Color
.AlphaFunc
);
132 if (ctx
->Color
.DitherFlag
) {
133 blend
[b
].blend1
.dither_enable
= 1;
134 blend
[b
].blend1
.y_dither_offset
= 0;
135 blend
[b
].blend1
.x_dither_offset
= 0;
138 blend
[b
].blend1
.write_disable_r
= !ctx
->Color
.ColorMask
[b
][0];
139 blend
[b
].blend1
.write_disable_g
= !ctx
->Color
.ColorMask
[b
][1];
140 blend
[b
].blend1
.write_disable_b
= !ctx
->Color
.ColorMask
[b
][2];
141 blend
[b
].blend1
.write_disable_a
= !ctx
->Color
.ColorMask
[b
][3];
144 brw
->state
.dirty
.cache
|= CACHE_NEW_BLEND_STATE
;
147 const struct brw_tracked_state gen6_blend_state
= {
149 .mesa
= (_NEW_COLOR
|
151 .brw
= BRW_NEW_BATCH
,
154 .prepare
= prepare_blend_state
,
158 gen6_prepare_color_calc_state(struct brw_context
*brw
)
160 struct gl_context
*ctx
= &brw
->intel
.ctx
;
161 struct gen6_color_calc_state
*cc
;
163 cc
= brw_state_batch(brw
, AUB_TRACE_CC_STATE
,
164 sizeof(*cc
), 64, &brw
->cc
.state_offset
);
165 memset(cc
, 0, sizeof(*cc
));
168 cc
->cc0
.alpha_test_format
= BRW_ALPHATEST_FORMAT_UNORM8
;
169 UNCLAMPED_FLOAT_TO_UBYTE(cc
->cc1
.alpha_ref_fi
.ui
, ctx
->Color
.AlphaRef
);
172 cc
->cc0
.stencil_ref
= ctx
->Stencil
.Ref
[0];
173 cc
->cc0
.bf_stencil_ref
= ctx
->Stencil
.Ref
[ctx
->Stencil
._BackFace
];
176 cc
->constant_r
= ctx
->Color
.BlendColorUnclamped
[0];
177 cc
->constant_g
= ctx
->Color
.BlendColorUnclamped
[1];
178 cc
->constant_b
= ctx
->Color
.BlendColorUnclamped
[2];
179 cc
->constant_a
= ctx
->Color
.BlendColorUnclamped
[3];
181 brw
->state
.dirty
.cache
|= CACHE_NEW_COLOR_CALC_STATE
;
184 const struct brw_tracked_state gen6_color_calc_state
= {
186 .mesa
= _NEW_COLOR
| _NEW_STENCIL
,
187 .brw
= BRW_NEW_BATCH
,
190 .prepare
= gen6_prepare_color_calc_state
,
193 static void upload_cc_state_pointers(struct brw_context
*brw
)
195 struct intel_context
*intel
= &brw
->intel
;
198 OUT_BATCH(_3DSTATE_CC_STATE_POINTERS
<< 16 | (4 - 2));
199 OUT_BATCH(brw
->cc
.blend_state_offset
| 1);
200 OUT_BATCH(brw
->cc
.depth_stencil_state_offset
| 1);
201 OUT_BATCH(brw
->cc
.state_offset
| 1);
205 const struct brw_tracked_state gen6_cc_state_pointers
= {
208 .brw
= (BRW_NEW_BATCH
|
209 BRW_NEW_STATE_BASE_ADDRESS
),
210 .cache
= (CACHE_NEW_BLEND_STATE
|
211 CACHE_NEW_COLOR_CALC_STATE
|
212 CACHE_NEW_DEPTH_STENCIL_STATE
)
214 .emit
= upload_cc_state_pointers
,