1 /**************************************************************************
3 * Copyright 2010 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 THE AUTHORS 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 **************************************************************************/
29 #include "st_context.h"
30 #include "pipe/p_screen.h"
31 #include "pipe/p_context.h"
33 #include "st_program.h"
35 #include "cso_cache/cso_context.h"
36 #include "main/framebuffer.h"
39 /* Update the sample mask for MSAA.
42 st_update_sample_mask(struct st_context
*st
)
44 unsigned sample_mask
= 0xffffffff;
45 unsigned sample_count
= st
->state
.fb_num_samples
;
47 if (_mesa_is_multisample_enabled(st
->ctx
) && sample_count
> 1) {
48 /* unlike in gallium/d3d10 the mask is only active if msaa is enabled */
49 if (st
->ctx
->Multisample
.SampleCoverage
) {
50 unsigned nr_bits
= (unsigned)
51 (st
->ctx
->Multisample
.SampleCoverageValue
* (float) sample_count
);
52 /* there's lot of ways how to do this. We just use first few bits,
53 * since we have no knowledge of sample positions here. When
54 * app-supplied mask though is used too might need to be smarter.
55 * Also, there's an interface restriction here in theory it is
56 * encouraged this mask not be the same at each pixel.
58 sample_mask
= (1 << nr_bits
) - 1;
59 if (st
->ctx
->Multisample
.SampleCoverageInvert
)
60 sample_mask
= ~sample_mask
;
62 if (st
->ctx
->Multisample
.SampleMask
)
63 sample_mask
&= st
->ctx
->Multisample
.SampleMaskValue
;
66 cso_set_sample_mask(st
->cso_context
, sample_mask
);
71 st_update_sample_shading(struct st_context
*st
)
76 if (!st
->ctx
->Extensions
.ARB_sample_shading
)
79 cso_set_min_samples(st
->cso_context
,
80 _mesa_get_min_invocations_per_fragment(st
->ctx
, &st
->fp
->Base
, false));