1 /**************************************************************************
3 * Copyright 2007 VMware, Inc.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
30 * Keith Whitwell <keithw@vmware.com>
34 #include "st_context.h"
35 #include "pipe/p_context.h"
37 #include "st_program.h"
38 #include "util/u_debug.h"
39 #include "cso_cache/cso_context.h"
42 /* Second state atom for user clip planes:
44 void st_update_clip( struct st_context
*st
)
46 struct pipe_clip_state clip
;
47 const struct gl_context
*ctx
= st
->ctx
;
50 STATIC_ASSERT(sizeof(clip
.ucp
) <= sizeof(ctx
->Transform
._ClipUserPlane
));
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
])
57 /* _ClipUserPlane = _NEW_TRANSFORM | _NEW_PROJECTION
58 * EyeUserPlane = _NEW_TRANSFORM
61 use_eye
? ctx
->Transform
.EyeUserPlane
62 : ctx
->Transform
._ClipUserPlane
, sizeof(clip
.ucp
));
64 if (memcmp(&st
->state
.clip
, &clip
, sizeof(clip
)) != 0) {
65 st
->state
.clip
= clip
;
66 st
->pipe
->set_clip_state(st
->pipe
, &clip
);