src/gallium/auxiliary/util/u_prim.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 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,
  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 TUNGSTEN GRAPHICS 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 #ifndef U_BLIT_H
  30 #define U_BLIT_H
  31
  32
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 #include "pipe/p_defines.h"
  38
  39 static INLINE boolean u_validate_pipe_prim( unsigned pipe_prim, unsigned nr )
  40 {
  41    boolean ok = TRUE;
  42
  43    switch (pipe_prim) {
  44    case PIPE_PRIM_POINTS:
  45       ok = (nr >= 1);
  46       break;
  47    case PIPE_PRIM_LINES:
  48       ok = (nr >= 2);
  49       break;
  50    case PIPE_PRIM_LINE_STRIP:
  51    case PIPE_PRIM_LINE_LOOP:
  52       ok = (nr >= 2);
  53       break;
  54    case PIPE_PRIM_TRIANGLES:
  55       ok = (nr >= 3);
  56       break;
  57    case PIPE_PRIM_TRIANGLE_STRIP:
  58    case PIPE_PRIM_TRIANGLE_FAN:
  59    case PIPE_PRIM_POLYGON:
  60       ok = (nr >= 3);
  61       break;
  62    case PIPE_PRIM_QUADS:
  63       ok = (nr >= 4);
  64       break;
  65    case PIPE_PRIM_QUAD_STRIP:
  66       ok = (nr >= 4);
  67       break;
  68    default:
  69       ok = 0;
  70       break;
  71    }
  72
  73    return ok;
  74 }
  75
  76
  77 static INLINE boolean u_trim_pipe_prim( unsigned pipe_prim, unsigned *nr )
  78 {
  79    boolean ok = TRUE;
  80
  81    switch (pipe_prim) {
  82    case PIPE_PRIM_POINTS:
  83       ok = (*nr >= 1);
  84       break;
  85    case PIPE_PRIM_LINES:
  86       ok = (*nr >= 2);
  87       *nr -= (*nr % 2);
  88       break;
  89    case PIPE_PRIM_LINE_STRIP:
  90    case PIPE_PRIM_LINE_LOOP:
  91       ok = (*nr >= 2);
  92       break;
  93    case PIPE_PRIM_TRIANGLES:
  94       ok = (*nr >= 3);
  95       *nr -= (*nr % 3);
  96       break;
  97    case PIPE_PRIM_TRIANGLE_STRIP:
  98    case PIPE_PRIM_TRIANGLE_FAN:
  99    case PIPE_PRIM_POLYGON:
 100       ok = (*nr >= 3);
 101       break;
 102    case PIPE_PRIM_QUADS:
 103       ok = (*nr >= 4);
 104       *nr -= (*nr % 4);
 105       break;
 106    case PIPE_PRIM_QUAD_STRIP:
 107       ok = (*nr >= 4);
 108       *nr -= (*nr % 2);
 109       break;
 110    default:
 111       ok = 0;
 112       break;
 113    }
 114
 115    if (!ok)
 116       *nr = 0;
 117
 118    return ok;
 119 }
 120
 121
 122 static INLINE unsigned u_reduced_prim( unsigned pipe_prim )
 123 {
 124    switch (pipe_prim) {
 125    case PIPE_PRIM_POINTS:
 126       return PIPE_PRIM_POINTS;
 127
 128    case PIPE_PRIM_LINES:
 129    case PIPE_PRIM_LINE_STRIP:
 130    case PIPE_PRIM_LINE_LOOP:
 131       return PIPE_PRIM_LINES;
 132
 133    default:
 134       return PIPE_PRIM_TRIANGLES;
 135    }
 136 }
 137
 138 const char *u_prim_name( unsigned pipe_prim );
 139
 140 #endif