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/**************************************************************************
*
* Copyright 2010 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#include "st_context.h"
#include "pipe/p_screen.h"
#include "pipe/p_context.h"
#include "st_atom.h"
#include "st_program.h"
#include "cso_cache/cso_context.h"
#include "main/framebuffer.h"
/* Update the sample mask for MSAA.
*/
void
st_update_sample_mask(struct st_context *st)
{
unsigned sample_mask = 0xffffffff;
unsigned sample_count = st->state.fb_num_samples;
if (_mesa_is_multisample_enabled(st->ctx) && sample_count > 1) {
/* unlike in gallium/d3d10 the mask is only active if msaa is enabled */
if (st->ctx->Multisample.SampleCoverage) {
unsigned nr_bits = (unsigned)
(st->ctx->Multisample.SampleCoverageValue * (float) sample_count);
/* there's lot of ways how to do this. We just use first few bits,
* since we have no knowledge of sample positions here. When
* app-supplied mask though is used too might need to be smarter.
* Also, there's an interface restriction here in theory it is
* encouraged this mask not be the same at each pixel.
*/
sample_mask = (1 << nr_bits) - 1;
if (st->ctx->Multisample.SampleCoverageInvert)
sample_mask = ~sample_mask;
}
if (st->ctx->Multisample.SampleMask)
sample_mask &= st->ctx->Multisample.SampleMaskValue;
}
cso_set_sample_mask(st->cso_context, sample_mask);
}
void
st_update_sample_shading(struct st_context *st)
{
if (!st->fp)
return;
if (!st->ctx->Extensions.ARB_sample_shading)
return;
cso_set_min_samples(st->cso_context,
_mesa_get_min_invocations_per_fragment(st->ctx, &st->fp->Base, false));
}
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