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      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
      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:
     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
     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.
     25  *
     26  **************************************************************************/
     27 
     28 
     29 #include "st_context.h"
     30 #include "pipe/p_context.h"
     31 #include "st_atom.h"
     32 
     33 #include "cso_cache/cso_context.h"
     34 
     35 
     36 /* Second state atom for user clip planes:
     37  */
     38 static void update_sample_mask( struct st_context *st )
     39 {
     40    unsigned sample_mask = 0xffffffff;
     41    unsigned sample_count = 1;
     42    struct pipe_framebuffer_state *framebuffer = &st->state.framebuffer;
     43 
     44    /* dependency here on bound surface (or rather, sample count) is worrying */
     45    if (framebuffer->zsbuf)
     46       sample_count = framebuffer->zsbuf->texture->nr_samples;
     47    else if (framebuffer->cbufs[0])
     48       sample_count = framebuffer->cbufs[0]->texture->nr_samples;
     49 
     50    if (st->ctx->Multisample.Enabled && sample_count > 1) {
     51    /* unlike in gallium/d3d10 the mask is only active if msaa is enabled */
     52       if (st->ctx->Multisample.SampleCoverage) {
     53          unsigned nr_bits;
     54          nr_bits = st->ctx->Multisample.SampleCoverageValue * (float)sample_count;
     55          /* there's lot of ways how to do this. We just use first few bits,
     56             since we have no knowledge of sample positions here. When
     57             app-supplied mask though is used too might need to be smarter.
     58             Also, there's a interface restriction here in theory it is
     59             encouraged this mask not be the same at each pixel. */
     60          sample_mask = (1 << nr_bits) - 1;
     61          if (st->ctx->Multisample.SampleCoverageInvert)
     62             sample_mask = ~sample_mask;
     63       }
     64       /* TODO merge with app-supplied sample mask */
     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 
     76 const struct st_tracked_state st_update_msaa = {
     77    "st_update_msaa",					/* name */
     78    {							/* dirty */
     79       (_NEW_MULTISAMPLE | _NEW_BUFFERS),		/* mesa */
     80       ST_NEW_FRAMEBUFFER,				/* st */
     81    },
     82    update_sample_mask					/* update */
     83 };
     84