src/mesa/state_tracker/st_atom_clip.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 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   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33
  34 #include "st_context.h"
  35 #include "pipe/p_context.h"
  36 #include "st_atom.h"
  37
  38
  39 /* Second state atom for user clip planes:
  40  */
  41 static void update_clip( struct st_context *st )
  42 {
  43    struct pipe_clip_state clip;
  44    GLuint i;
  45
  46    memset(&clip, 0, sizeof(clip));
  47
  48    for (i = 0; i < PIPE_MAX_CLIP_PLANES; i++) {
  49       if (st->ctx->Transform.ClipPlanesEnabled & (1 << i)) {
  50          memcpy(clip.ucp[clip.nr],
  51                 st->ctx->Transform._ClipUserPlane[i],
  52                 sizeof(clip.ucp[0]));
  53          clip.nr++;
  54       }
  55    }
  56
  57    if (memcmp(&clip, &st->state.clip, sizeof(clip)) != 0) {
  58       st->state.clip = clip;
  59       st->pipe->set_clip_state(st->pipe, &clip);
  60    }
  61 }
  62
  63
  64 const struct st_tracked_state st_update_clip = {
  65    "st_update_clip",                                    /* name */
  66    {                                                    /* dirty */
  67       (_NEW_TRANSFORM),                                 /* mesa */
  68       0,                                                /* st */
  69    },
  70    update_clip                                          /* update */
  71 };