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util: new funcs for triming/validating primitives

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This commit is contained in:
Keith Whitwell 2008-12-09 16:57:53 +00:00
parent 7519107a97
commit 50beb86ce3
1 changed files with 122 additions and 0 deletions
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122
src/gallium/auxiliary/util/u_prim.h Normal file
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/**************************************************************************
*
* Copyright 2008 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.
*
**************************************************************************/
#ifndef U_BLIT_H
#define U_BLIT_H
#ifdef __cplusplus
extern "C" {
#endif
#include "pipe/p_defines.h"
static INLINE boolean u_validate_pipe_prim( unsigned pipe_prim, unsigned nr )
{
boolean ok = TRUE;
switch (pipe_prim) {
case PIPE_PRIM_POINTS:
ok = (nr >= 1);
break;
case PIPE_PRIM_LINES:
ok = (nr >= 2);
break;
case PIPE_PRIM_LINE_STRIP:
case PIPE_PRIM_LINE_LOOP:
ok = (nr >= 2);
break;
case PIPE_PRIM_TRIANGLES:
ok = (nr >= 3);
break;
case PIPE_PRIM_TRIANGLE_STRIP:
case PIPE_PRIM_TRIANGLE_FAN:
case PIPE_PRIM_POLYGON:
ok = (nr >= 3);
break;
case PIPE_PRIM_QUADS:
ok = (nr >= 4);
break;
case PIPE_PRIM_QUAD_STRIP:
ok = (nr >= 4);
break;
default:
ok = 0;
break;
}
return ok;
}
static INLINE boolean u_trim_pipe_prim( unsigned pipe_prim, unsigned *nr )
{
boolean ok = TRUE;
switch (pipe_prim) {
case PIPE_PRIM_POINTS:
ok = (*nr >= 1);
break;
case PIPE_PRIM_LINES:
ok = (*nr >= 2);
*nr -= (*nr % 2);
break;
case PIPE_PRIM_LINE_STRIP:
case PIPE_PRIM_LINE_LOOP:
ok = (*nr >= 2);
break;
case PIPE_PRIM_TRIANGLES:
ok = (*nr >= 3);
*nr -= (*nr % 3);
break;
case PIPE_PRIM_TRIANGLE_STRIP:
case PIPE_PRIM_TRIANGLE_FAN:
case PIPE_PRIM_POLYGON:
ok = (*nr >= 3);
break;
case PIPE_PRIM_QUADS:
ok = (*nr >= 4);
*nr -= (*nr % 4);
break;
case PIPE_PRIM_QUAD_STRIP:
ok = (*nr >= 4);
*nr -= (*nr % 2);
break;
default:
ok = 0;
break;
}
if (!ok)
*nr = 0;
return ok;
}
#endif