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  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. #include "cso_cache/cso_context.h"
  39.  
  40.  
  41. /* Second state atom for user clip planes:
  42.  */
  43. static void update_clip( struct st_context *st )
  44. {
  45.    struct pipe_clip_state clip;
  46.    GLuint i;
  47.  
  48.    memset(&clip, 0, sizeof(clip));
  49.  
  50.    for (i = 0; i < PIPE_MAX_CLIP_PLANES; i++) {
  51.       if (st->ctx->Transform.ClipPlanesEnabled & (1 << i)) {
  52.          memcpy(clip.ucp[clip.nr],
  53.                 st->ctx->Transform._ClipUserPlane[i],
  54.                 sizeof(clip.ucp[0]));
  55.          clip.nr++;
  56.       }
  57.    }
  58.  
  59.    clip.depth_clamp = st->ctx->Transform.DepthClamp != GL_FALSE;
  60.      
  61.    if (memcmp(&clip, &st->state.clip, sizeof(clip)) != 0) {
  62.       st->state.clip = clip;
  63.       cso_set_clip(st->cso_context, &clip);
  64.    }
  65. }
  66.  
  67.  
  68. const struct st_tracked_state st_update_clip = {
  69.    "st_update_clip",                                    /* name */
  70.    {                                                    /* dirty */
  71.       (_NEW_TRANSFORM),                                 /* mesa */
  72.       0,                                                /* st */
  73.    },
  74.    update_clip                                          /* update */
  75. };
  76.