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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.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
#include "draw_private.h"
#include "draw_context.h"
static void
draw_prim_info(unsigned prim, unsigned *first, unsigned *incr)
{
assert(prim >= PIPE_PRIM_POINTS);
assert(prim <= PIPE_PRIM_POLYGON);
switch (prim) {
case PIPE_PRIM_POINTS:
*first = 1;
*incr = 1;
break;
case PIPE_PRIM_LINES:
*first = 2;
*incr = 2;
break;
case PIPE_PRIM_LINE_STRIP:
*first = 2;
*incr = 1;
break;
case PIPE_PRIM_LINE_LOOP:
*first = 2;
*incr = 1;
break;
case PIPE_PRIM_TRIANGLES:
*first = 3;
*incr = 3;
break;
case PIPE_PRIM_TRIANGLE_STRIP:
*first = 3;
*incr = 1;
break;
case PIPE_PRIM_TRIANGLE_FAN:
case PIPE_PRIM_POLYGON:
*first = 3;
*incr = 1;
break;
case PIPE_PRIM_QUADS:
*first = 4;
*incr = 4;
break;
case PIPE_PRIM_QUAD_STRIP:
*first = 4;
*incr = 2;
break;
default:
assert(0);
*first = 1;
*incr = 1;
break;
}
}
unsigned
draw_trim_prim( unsigned mode, unsigned count )
{
unsigned length, first, incr;
draw_prim_info( mode, &first, &incr );
if (count < first)
length = 0;
else
length = count - (count - first) % incr;
return length;
}
boolean
draw_validate_prim( unsigned mode, unsigned count )
{
return (count > 0 &&
count == draw_trim_prim( mode, count ));
}
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