src/mesa/state_tracker/st_atom_msaa.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  26  **************************************************************************/
  27
  28
  29 #include "st_context.h"
  30 #include "pipe/p_screen.h"
  31 #include "pipe/p_context.h"
  32 #include "st_atom.h"
  33 #include "st_program.h"
  34
  35 #include "cso_cache/cso_context.h"
  36 #include "util/u_framebuffer.h"
  37
  38
  39 /* Second state atom for user clip planes:
  40  */
  41 static void update_sample_mask( struct st_context *st )
  42 {
  43    unsigned sample_mask = 0xffffffff;
  44    struct pipe_framebuffer_state *framebuffer = &st->state.framebuffer;
  45    /* dependency here on bound surface (or rather, sample count) is worrying */
  46    unsigned sample_count = util_framebuffer_get_num_samples(framebuffer);
  47
  48    if (st->ctx->Multisample.Enabled && sample_count > 1) {
  49    /* unlike in gallium/d3d10 the mask is only active if msaa is enabled */
  50       if (st->ctx->Multisample.SampleCoverage) {
  51          unsigned nr_bits;
  52          nr_bits = (unsigned)
  53             (st->ctx->Multisample.SampleCoverageValue * (float)sample_count);
  54          /* there's lot of ways how to do this. We just use first few bits,
  55             since we have no knowledge of sample positions here. When
  56             app-supplied mask though is used too might need to be smarter.
  57             Also, there's a interface restriction here in theory it is
  58             encouraged this mask not be the same at each pixel. */
  59          sample_mask = (1 << nr_bits) - 1;
  60          if (st->ctx->Multisample.SampleCoverageInvert)
  61             sample_mask = ~sample_mask;
  62       }
  63       if (st->ctx->Multisample.SampleMask)
  64          sample_mask &= st->ctx->Multisample.SampleMaskValue;
  65    }
  66
  67    /* mask off unused bits or don't care? */
  68
  69    if (sample_mask != st->state.sample_mask) {
  70       st->state.sample_mask = sample_mask;
  71       cso_set_sample_mask(st->cso_context, sample_mask);
  72    }
  73 }
  74
  75 static void update_sample_shading( struct st_context *st )
  76 {
  77    if (!st->fp)
  78       return;
  79
  80    if (!st->ctx->Extensions.ARB_sample_shading)
  81       return;
  82
  83    cso_set_min_samples(
  84          st->cso_context,
  85          _mesa_get_min_invocations_per_fragment(st->ctx, &st->fp->Base, false));
  86 }
  87
  88 const struct st_tracked_state st_update_msaa = {
  89    "st_update_msaa",                                    /* name */
  90    {                                                    /* dirty */
  91       (_NEW_MULTISAMPLE | _NEW_BUFFERS),                /* mesa */
  92       ST_NEW_FRAMEBUFFER,                               /* st */
  93    },
  94    update_sample_mask                                   /* update */
  95 };
  96
  97 const struct st_tracked_state st_update_sample_shading = {
  98    "st_update_sample_shading",                          /* name */
  99    {                                                    /* dirty */
 100       (_NEW_MULTISAMPLE | _NEW_PROGRAM | _NEW_BUFFERS), /* mesa */
 101       ST_NEW_FRAGMENT_PROGRAM | ST_NEW_FRAMEBUFFER,     /* st */
 102    },
 103    update_sample_shading                                /* update */
 104 };