src/gallium/auxiliary/draw/draw_vertex.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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,
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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
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /*
  29  * Functions for specifying the post-transformation vertex layout.
  30  *
  31  * Author:
  32  *    Brian Paul
  33  *    Keith Whitwell
  34  */
  35
  36
  37 #include "draw/draw_private.h"
  38 #include "draw/draw_vertex.h"
  39
  40
  41 /**
  42  * Compute the size of a vertex, in dwords/floats, to update the
  43  * vinfo->size field.
  44  */
  45 void
  46 draw_compute_vertex_size(struct vertex_info *vinfo)
  47 {
  48    uint i;
  49
  50    vinfo->size = 0;
  51    for (i = 0; i < vinfo->num_attribs; i++) {
  52       switch (vinfo->emit[i]) {
  53       case EMIT_OMIT:
  54          break;
  55       case EMIT_HEADER:
  56          vinfo->size += sizeof(struct vertex_header) / 4;
  57          break;
  58       case EMIT_4UB:
  59          /* fall-through */
  60       case EMIT_1F_PSIZE:
  61          /* fall-through */
  62       case EMIT_1F:
  63          vinfo->size += 1;
  64          break;
  65       case EMIT_2F:
  66          vinfo->size += 2;
  67          break;
  68       case EMIT_3F:
  69          vinfo->size += 3;
  70          break;
  71       case EMIT_4F:
  72          vinfo->size += 4;
  73          break;
  74       case EMIT_ALL:
  75          /* fall-through */
  76       default:
  77          assert(0);
  78       }
  79    }
  80
  81    assert(vinfo->size * 4 <= MAX_VERTEX_SIZE);
  82 }