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 */
44static 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
67const struct st_tracked_state st_update_clip = {
68   "st_update_clip",					/* name */
69   {							/* dirty */
70      (_NEW_TRANSFORM | _NEW_PROGRAM),			/* mesa */
71      0,						/* st */
72   },
73   update_clip						/* update */
74};
75