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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. #include "st_program.h"
  38. #include "util/u_debug.h"
  39. #include "cso_cache/cso_context.h"
  40.  
  41.  
  42. /* Second state atom for user clip planes:
  43.  */
  44. static void update_clip( struct st_context *st )
  45. {
  46.    struct pipe_clip_state clip;
  47.    const struct gl_context *ctx = st->ctx;
  48.    bool use_eye = FALSE;
  49.  
  50.    STATIC_ASSERT(sizeof(clip.ucp) <= sizeof(ctx->Transform._ClipUserPlane));
  51.  
  52.    /* if we have a vertex shader that writes clip vertex we need to pass
  53.       the pre-projection transformed coordinates into the driver. */
  54.    if (st->vp) {
  55.       if (ctx->Shader.CurrentVertexProgram)
  56.          use_eye = TRUE;
  57.    }
  58.  
  59.    memcpy(clip.ucp,
  60.           use_eye ? ctx->Transform.EyeUserPlane
  61.                   : ctx->Transform._ClipUserPlane, sizeof(clip.ucp));
  62.    st->state.clip = clip;
  63.    cso_set_clip(st->cso_context, &clip);
  64. }
  65.  
  66.  
  67. const struct st_tracked_state st_update_clip = {
  68.    "st_update_clip",                                    /* name */
  69.    {                                                    /* dirty */
  70.       _NEW_TRANSFORM,                                   /* mesa */
  71.       ST_NEW_VERTEX_PROGRAM,                            /* st */
  72.    },
  73.    update_clip                                          /* update */
  74. };
  75.