src/mesa/pipe/softpipe/sp_quad_occlusion.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  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.
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  27
  28
  29 /**
  30  * \brief  Quad occlusion counter stage
  31  * \author  Brian Paul
  32  */
  33
  34
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_util.h"
  37 #include "sp_context.h"
  38 #include "sp_headers.h"
  39 #include "sp_surface.h"
  40 #include "sp_quad.h"
  41
  42
  43 static void
  44 occlusion_count_quad(struct quad_stage *qs, struct quad_header *quad)
  45 {
  46    struct softpipe_context *softpipe = qs->softpipe;
  47    struct pipe_query_object *occ
  48       = softpipe->queries[PIPE_QUERY_OCCLUSION_COUNTER];
  49
  50    occ->count += (quad->mask     ) & 1;
  51    occ->count += (quad->mask >> 1) & 1;
  52    occ->count += (quad->mask >> 2) & 1;
  53    occ->count += (quad->mask >> 3) & 1;
  54
  55    if (quad->mask)
  56       qs->next->run(qs->next, quad);
  57 }
  58
  59
  60 static void occlusion_begin(struct quad_stage *qs)
  61 {
  62    if (qs->next)
  63       qs->next->begin(qs->next);
  64 }
  65
  66
  67 static void occlusion_destroy(struct quad_stage *qs)
  68 {
  69    FREE( qs );
  70 }
  71
  72
  73 struct quad_stage *sp_quad_occlusion_stage( struct softpipe_context *softpipe )
  74 {
  75    struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
  76
  77    stage->softpipe = softpipe;
  78    stage->begin = occlusion_begin;
  79    stage->run = occlusion_count_quad;
  80    stage->destroy = occlusion_destroy;
  81
  82    return stage;
  83 }