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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
*/
#include "st_context.h"
#include "pipe/p_context.h"
#include "st_atom.h"
#include "st_program.h"
#include "cso_cache/cso_context.h"
/* Second state atom for user clip planes:
*/
static void update_clip( struct st_context *st )
{
struct pipe_clip_state clip;
const struct gl_context *ctx = st->ctx;
GLuint i;
bool use_eye = FALSE;
memset(&clip, 0, sizeof(clip));
/* if we have a vertex shader that writes clip vertex we need to pass
the pre-projection transformed coordinates into the driver. */
if (st->vp) {
if (ctx->Shader.CurrentVertexProgram)
use_eye = TRUE;
}
for (i = 0; i < PIPE_MAX_CLIP_PLANES; i++) {
if (ctx->Transform.ClipPlanesEnabled & (1 << i)) {
memcpy(clip.ucp[clip.nr],
use_eye ? ctx->Transform.EyeUserPlane[i] : ctx->Transform._ClipUserPlane[i],
sizeof(clip.ucp[0]));
clip.nr++;
}
}
clip.depth_clamp = ctx->Transform.DepthClamp != GL_FALSE;
if (memcmp(&clip, &st->state.clip, sizeof(clip)) != 0) {
st->state.clip = clip;
cso_set_clip(st->cso_context, &clip);
}
}
const struct st_tracked_state st_update_clip = {
"st_update_clip", /* name */
{ /* dirty */
(_NEW_TRANSFORM | _NEW_PROGRAM), /* mesa */
0, /* st */
},
update_clip /* update */
};
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