u_prim.h

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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.
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#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

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