1 /**************************************************************************
2 *
3 * Copyright 2007 VMware, Inc.
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 VMWARE 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 <keithw@vmware.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 */
st_update_clip(struct st_context * st)44 void st_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 (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX])
55 use_eye = TRUE;
56
57 /* _ClipUserPlane = _NEW_TRANSFORM | _NEW_PROJECTION
58 * EyeUserPlane = _NEW_TRANSFORM
59 */
60 memcpy(clip.ucp,
61 use_eye ? ctx->Transform.EyeUserPlane
62 : ctx->Transform._ClipUserPlane, sizeof(clip.ucp));
63
64 if (memcmp(&st->state.clip, &clip, sizeof(clip)) != 0) {
65 st->state.clip = clip;
66 st->pipe->set_clip_state(st->pipe, &clip);
67 }
68 }
69