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Store clipping distance for user clip planes as part of vertex processing

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Once the clipping distance is calculated and stored per vertex, the
distances can be re-used when clipping is actually performed.  This
doesn't have any immediate benefit, but it paves the way for
implementing gl_ClipDistance in vertex shaders and result.clip[] in
vertex programs.

This has not produces any oglconform regressions on my G31 system
which uses software TNL.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Ian Romanick
2009-10-08 17:28:02 -07:00
parent cf33aaf8fe
commit f058b25881
4 changed files with 132 additions and 18 deletions
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15
src/mesa/tnl/t_vb_program.c
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@@ -66,6 +66,7 @@ struct vp_stage_data {
GLvector4f results[VERT_RESULT_MAX];
GLvector4f ndcCoords; /**< normalized device coords */
GLfloat *clipdistance[MAX_CLIP_PLANES];
GLubyte *clipmask; /**< clip flags */
GLubyte ormask, andmask; /**< for clipping */
};
@@ -77,6 +78,7 @@ struct vp_stage_data {
static void
userclip( GLcontext *ctx,
GLvector4f *clip,
GLfloat *clipdistance[MAX_CLIP_PLANES],
GLubyte *clipmask,
GLubyte *clipormask,
GLubyte *clipandmask )
@@ -105,6 +107,8 @@ userclip( GLcontext *ctx,
clipmask[i] |= CLIP_USER_BIT;
}
clipdistance[p][i] = dp;
STRIDE_F(coord, stride);
}
@@ -164,6 +168,7 @@ do_ndc_cliptest(GLcontext *ctx, struct vp_stage_data *store)
ctx->VertexProgram.Current->IsPositionInvariant)) {
userclip( ctx,
VB->ClipPtr,
store->clipdistance,
store->clipmask,
&store->ormask,
&store->andmask );
@@ -171,6 +176,9 @@ do_ndc_cliptest(GLcontext *ctx, struct vp_stage_data *store)
if (store->andmask) {
return GL_FALSE;
}
memcpy(VB->ClipDistancePtr, store->clipdistance,
sizeof(store->clipdistance));
}
VB->ClipAndMask = store->andmask;
@@ -514,6 +522,10 @@ init_vp(GLcontext *ctx, struct tnl_pipeline_stage *stage)
_mesa_vector4f_alloc( &store->ndcCoords, 0, size, 32 );
store->clipmask = (GLubyte *) ALIGN_MALLOC(sizeof(GLubyte)*size, 32 );
for (i = 0; i < MAX_CLIP_PLANES; i++)
store->clipdistance[i] =
(GLfloat *) ALIGN_MALLOC(sizeof(GLfloat) * size, 32);
return GL_TRUE;
}
@@ -537,6 +549,9 @@ dtr(struct tnl_pipeline_stage *stage)
_mesa_vector4f_free( &store->ndcCoords );
ALIGN_FREE( store->clipmask );
for (i = 0; i < MAX_CLIP_PLANES; i++)
ALIGN_FREE(store->clipdistance[i]);
FREE( store );
stage->privatePtr = NULL;
}