sp_quad_occlusion.c

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/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
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 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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#include "pipe/p_defines.h"
#include "util/u_memory.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"

static unsigned count_bits( unsigned val )
{
   unsigned i;

   for (i = 0; val ; val >>= 1)
      i += (val & 1);

   return i;
}

static void
occlusion_count_quad(struct quad_stage *qs, struct quad_header *quad)
{
   struct softpipe_context *softpipe = qs->softpipe;

   softpipe->occlusion_count += count_bits(quad->inout.mask);

   qs->next->run(qs->next, quad);
}


static void occlusion_begin(struct quad_stage *qs)
{
   qs->next->begin(qs->next);
}


static void occlusion_destroy(struct quad_stage *qs)
{
   FREE( qs );
}


struct quad_stage *sp_quad_occlusion_stage( struct softpipe_context *softpipe )
{
   struct quad_stage *stage = CALLOC_STRUCT(quad_stage);

   stage->softpipe = softpipe;
   stage->begin = occlusion_begin;
   stage->run = occlusion_count_quad;
   stage->destroy = occlusion_destroy;

   return stage;
}

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