st_atom_clip.c

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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
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 /*
  * Authors:
  *   Keith Whitwell <keith@tungstengraphics.com>
  */
 

#include "st_context.h"
#include "pipe/p_context.h"
#include "st_atom.h"


/* Second state atom for user clip planes:
 */
static void update_clip( struct st_context *st )
{
   struct pipe_clip_state clip;
   GLuint i;

   memset(&clip, 0, sizeof(clip));

   for (i = 0; i < PIPE_MAX_CLIP_PLANES; i++) {
      if (st->ctx->Transform.ClipPlanesEnabled & (1 << i)) {
         memcpy(clip.ucp[clip.nr], 
                st->ctx->Transform._ClipUserPlane[i], 
                sizeof(clip.ucp[0]));
         clip.nr++;
      }
   }
      
   if (memcmp(&clip, &st->state.clip, sizeof(clip)) != 0) {
      st->state.clip = clip;
      st->pipe->set_clip_state(st->pipe, &clip);
   }
}


const struct st_tracked_state st_update_clip = {
   "st_update_clip",                                    /* name */
   {                                                    /* dirty */
      (_NEW_TRANSFORM),                                 /* mesa */
      0,                                                /* st */
   },
   update_clip                                          /* update */
};

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