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path: root/src/gallium/drivers/llvmpipe/lp_quad_occlusion.c
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/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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 TUNGSTEN GRAPHICS 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.
 * 
 **************************************************************************/


/**
 * \brief  Quad occlusion counter stage
 * \author  Brian Paul
 */


#include "pipe/p_defines.h"
#include "util/u_memory.h"
#include "lp_context.h"
#include "lp_quad.h"
#include "lp_surface.h"
#include "lp_quad_pipe.h"

static unsigned count_bits( unsigned val )
{
   unsigned i;

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

   return i;
}

static void
occlusion_count_quads(struct quad_stage *qs, struct quad_header *quads[], unsigned nr)
{
   struct llvmpipe_context *llvmpipe = qs->llvmpipe;
   unsigned i;

   for (i = 0; i < nr; i++)
      llvmpipe->occlusion_count += count_bits(quads[i]->inout.mask);

   qs->next->run(qs->next, quads, nr);
}


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 *lp_quad_occlusion_stage( struct llvmpipe_context *llvmpipe )
{
   struct quad_stage *stage = CALLOC_STRUCT(quad_stage);

   stage->llvmpipe = llvmpipe;
   stage->begin = occlusion_begin;
   stage->run = occlusion_count_quads;
   stage->destroy = occlusion_destroy;

   return stage;
}