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"
31 gen6_get_sample_position(struct gl_context
*ctx
,
32 struct gl_framebuffer
*fb
,
33 GLuint index
, GLfloat
*result
)
37 switch (fb
->Visual
.samples
) {
39 result
[0] = result
[1] = 0.5f
;
42 bits
= brw_multisample_positions_1x_2x
>> (8 * index
);
45 bits
= brw_multisample_positions_4x
>> (8 * index
);
48 bits
= brw_multisample_positions_8x
[index
>> 2] >> (8 * (index
& 3));
51 assert(!"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
;
64 gen6_emit_3dstate_multisample(struct brw_context
*brw
,
67 uint32_t number_of_multisamples
= 0;
68 uint32_t sample_positions_3210
= 0;
69 uint32_t sample_positions_7654
= 0;
73 switch (num_samples
) {
76 number_of_multisamples
= MS_NUMSAMPLES_1
;
79 number_of_multisamples
= MS_NUMSAMPLES_4
;
80 sample_positions_3210
= brw_multisample_positions_4x
;
83 number_of_multisamples
= MS_NUMSAMPLES_8
;
84 sample_positions_3210
= brw_multisample_positions_8x
[0];
85 sample_positions_7654
= brw_multisample_positions_8x
[1];
88 assert(!"Unrecognized num_samples in gen6_emit_3dstate_multisample");
92 /* 3DSTATE_MULTISAMPLE is nonpipelined. */
93 intel_emit_post_sync_nonzero_flush(brw
);
95 int len
= brw
->gen
>= 7 ? 4 : 3;
97 OUT_BATCH(_3DSTATE_MULTISAMPLE
<< 16 | (len
- 2));
98 OUT_BATCH(MS_PIXEL_LOCATION_CENTER
| number_of_multisamples
);
99 OUT_BATCH(sample_positions_3210
);
101 OUT_BATCH(sample_positions_7654
);
107 gen6_determine_sample_mask(struct brw_context
*brw
)
109 struct gl_context
*ctx
= &brw
->ctx
;
110 float coverage
= 1.0;
111 float coverage_invert
= false;
112 unsigned sample_mask
= ~0u;
114 unsigned num_samples
= ctx
->DrawBuffer
->Visual
.samples
;
116 if (ctx
->Multisample
._Enabled
) {
117 if (ctx
->Multisample
.SampleCoverage
) {
118 coverage
= ctx
->Multisample
.SampleCoverageValue
;
119 coverage_invert
= ctx
->Multisample
.SampleCoverageInvert
;
121 if (ctx
->Multisample
.SampleMask
) {
122 sample_mask
= ctx
->Multisample
.SampleMaskValue
;
126 if (num_samples
> 1) {
127 int coverage_int
= (int) (num_samples
* coverage
+ 0.5);
128 uint32_t coverage_bits
= (1 << coverage_int
) - 1;
130 coverage_bits
^= (1 << num_samples
) - 1;
131 return coverage_bits
& sample_mask
;
139 * 3DSTATE_SAMPLE_MASK
142 gen6_emit_3dstate_sample_mask(struct brw_context
*brw
, unsigned mask
)
145 OUT_BATCH(_3DSTATE_SAMPLE_MASK
<< 16 | (2 - 2));
151 static void upload_multisample_state(struct brw_context
*brw
)
153 struct gl_context
*ctx
= &brw
->ctx
;
155 /* _NEW_BUFFERS, _NEW_MULTISAMPLE */
156 unsigned num_samples
= ctx
->DrawBuffer
->Visual
.samples
;
158 gen6_emit_3dstate_multisample(brw
, num_samples
);
159 gen6_emit_3dstate_sample_mask(brw
, gen6_determine_sample_mask(brw
));
163 const struct brw_tracked_state gen6_multisample_state
= {
165 .mesa
= _NEW_BUFFERS
|
167 .brw
= BRW_NEW_CONTEXT
,
170 .emit
= upload_multisample_state