2 * Copyright © 2012 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 #include "intel_batchbuffer.h"
26 #include "brw_context.h"
27 #include "brw_defines.h"
28 #include "brw_multisample_state.h"
29 #include "main/framebuffer.h"
32 gen6_get_sample_position(struct gl_context
*ctx
,
33 struct gl_framebuffer
*fb
,
34 GLuint index
, GLfloat
*result
)
38 switch (_mesa_geometric_samples(fb
)) {
40 result
[0] = result
[1] = 0.5f
;
43 bits
= brw_multisample_positions_1x_2x
>> (8 * index
);
46 bits
= brw_multisample_positions_4x
>> (8 * index
);
49 bits
= brw_multisample_positions_8x
[index
>> 2] >> (8 * (index
& 3));
52 unreachable("Not implemented");
55 /* Convert from U0.4 back to a floating point coordinate. */
56 result
[0] = ((bits
>> 4) & 0xf) / 16.0f
;
57 result
[1] = (bits
& 0xf) / 16.0f
;
61 * Sample index layout shows the numbering of slots in a rectangular
62 * grid of samples with in a pixel. Sample number layout shows the
63 * rectangular grid of samples roughly corresponding to the real sample
64 * locations with in a pixel. Sample number layout matches the sample
65 * index layout in case of 2X and 4x MSAA, but they are different in
68 * 2X MSAA sample index / number layout
73 * 4X MSAA sample index / number layout
80 * 8X MSAA sample index layout 8x MSAA sample number layout
91 * A sample map is used to map sample indices to sample numbers.
94 gen6_set_sample_maps(struct gl_context
*ctx
)
96 uint8_t map_2x
[2] = {0, 1};
97 uint8_t map_4x
[4] = {0, 1, 2, 3};
98 uint8_t map_8x
[8] = {5, 2, 4, 6, 0, 3, 7, 1};
100 memcpy(ctx
->Const
.SampleMap2x
, map_2x
, sizeof(map_2x
));
101 memcpy(ctx
->Const
.SampleMap4x
, map_4x
, sizeof(map_4x
));
102 memcpy(ctx
->Const
.SampleMap8x
, map_8x
, sizeof(map_8x
));
106 * 3DSTATE_MULTISAMPLE
109 gen6_emit_3dstate_multisample(struct brw_context
*brw
,
110 unsigned num_samples
)
112 uint32_t number_of_multisamples
= 0;
113 uint32_t sample_positions_3210
= 0;
114 uint32_t sample_positions_7654
= 0;
116 assert(brw
->gen
< 8);
118 switch (num_samples
) {
121 number_of_multisamples
= MS_NUMSAMPLES_1
;
124 number_of_multisamples
= MS_NUMSAMPLES_4
;
125 sample_positions_3210
= brw_multisample_positions_4x
;
128 number_of_multisamples
= MS_NUMSAMPLES_8
;
129 sample_positions_3210
= brw_multisample_positions_8x
[0];
130 sample_positions_7654
= brw_multisample_positions_8x
[1];
133 unreachable("Unrecognized num_samples in gen6_emit_3dstate_multisample");
136 int len
= brw
->gen
>= 7 ? 4 : 3;
138 OUT_BATCH(_3DSTATE_MULTISAMPLE
<< 16 | (len
- 2));
139 OUT_BATCH(MS_PIXEL_LOCATION_CENTER
| number_of_multisamples
);
140 OUT_BATCH(sample_positions_3210
);
142 OUT_BATCH(sample_positions_7654
);
148 gen6_determine_sample_mask(struct brw_context
*brw
)
150 struct gl_context
*ctx
= &brw
->ctx
;
151 float coverage
= 1.0;
152 float coverage_invert
= false;
153 unsigned sample_mask
= ~0u;
155 /* BRW_NEW_NUM_SAMPLES */
156 unsigned num_samples
= brw
->num_samples
;
158 if (ctx
->Multisample
._Enabled
) {
159 if (ctx
->Multisample
.SampleCoverage
) {
160 coverage
= ctx
->Multisample
.SampleCoverageValue
;
161 coverage_invert
= ctx
->Multisample
.SampleCoverageInvert
;
163 if (ctx
->Multisample
.SampleMask
) {
164 sample_mask
= ctx
->Multisample
.SampleMaskValue
;
168 if (num_samples
> 1) {
169 int coverage_int
= (int) (num_samples
* coverage
+ 0.5);
170 uint32_t coverage_bits
= (1 << coverage_int
) - 1;
172 coverage_bits
^= (1 << num_samples
) - 1;
173 return coverage_bits
& sample_mask
;
181 * 3DSTATE_SAMPLE_MASK
184 gen6_emit_3dstate_sample_mask(struct brw_context
*brw
, unsigned mask
)
187 OUT_BATCH(_3DSTATE_SAMPLE_MASK
<< 16 | (2 - 2));
193 static void upload_multisample_state(struct brw_context
*brw
)
195 /* BRW_NEW_NUM_SAMPLES */
196 gen6_emit_3dstate_multisample(brw
, brw
->num_samples
);
197 gen6_emit_3dstate_sample_mask(brw
, gen6_determine_sample_mask(brw
));
201 const struct brw_tracked_state gen6_multisample_state
= {
203 .mesa
= _NEW_MULTISAMPLE
,
204 .brw
= BRW_NEW_CONTEXT
|
207 .emit
= upload_multisample_state