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Diffstat (limited to 'src/mesa/tnl/t_vb_program.c')
-rw-r--r--src/mesa/tnl/t_vb_program.c203
1 files changed, 151 insertions, 52 deletions
diff --git a/src/mesa/tnl/t_vb_program.c b/src/mesa/tnl/t_vb_program.c
index f8e561ac57e..f15f9d86197 100644
--- a/src/mesa/tnl/t_vb_program.c
+++ b/src/mesa/tnl/t_vb_program.c
@@ -46,6 +46,23 @@
#include "t_pipeline.h"
+
+/*!
+ * Private storage for the vertex program pipeline stage.
+ */
+struct vp_stage_data {
+ /** The results of running the vertex program go into these arrays. */
+ GLvector4f results[VERT_RESULT_MAX];
+
+ GLvector4f ndcCoords; /**< normalized device coords */
+ GLubyte *clipmask; /**< clip flags */
+ GLubyte ormask, andmask; /**< for clipping */
+};
+
+
+#define VP_STAGE_DATA(stage) ((struct vp_stage_data *)(stage->privatePtr))
+
+
/**
* XXX the texture sampling code in this module is a bit of a hack.
* The texture sampling code is in swrast, though it doesn't have any
@@ -53,6 +70,108 @@
* moved into main/ someday.
*/
+static void userclip( GLcontext *ctx,
+ GLvector4f *clip,
+ GLubyte *clipmask,
+ GLubyte *clipormask,
+ GLubyte *clipandmask )
+{
+ GLuint p;
+
+ for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
+ if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
+ GLuint nr, i;
+ const GLfloat a = ctx->Transform._ClipUserPlane[p][0];
+ const GLfloat b = ctx->Transform._ClipUserPlane[p][1];
+ const GLfloat c = ctx->Transform._ClipUserPlane[p][2];
+ const GLfloat d = ctx->Transform._ClipUserPlane[p][3];
+ GLfloat *coord = (GLfloat *)clip->data;
+ GLuint stride = clip->stride;
+ GLuint count = clip->count;
+
+ for (nr = 0, i = 0 ; i < count ; i++) {
+ GLfloat dp = (coord[0] * a +
+ coord[1] * b +
+ coord[2] * c +
+ coord[3] * d);
+
+ if (dp < 0) {
+ nr++;
+ clipmask[i] |= CLIP_USER_BIT;
+ }
+
+ STRIDE_F(coord, stride);
+ }
+
+ if (nr > 0) {
+ *clipormask |= CLIP_USER_BIT;
+ if (nr == count) {
+ *clipandmask |= CLIP_USER_BIT;
+ return;
+ }
+ }
+ }
+ }
+}
+
+
+static GLboolean
+do_ndc_cliptest(GLcontext *ctx, struct vp_stage_data *store)
+{
+ TNLcontext *tnl = TNL_CONTEXT(ctx);
+ struct vertex_buffer *VB = &tnl->vb;
+ /* Cliptest and perspective divide. Clip functions must clear
+ * the clipmask.
+ */
+ store->ormask = 0;
+ store->andmask = CLIP_FRUSTUM_BITS;
+
+ if (tnl->NeedNdcCoords) {
+ VB->NdcPtr =
+ _mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
+ &store->ndcCoords,
+ store->clipmask,
+ &store->ormask,
+ &store->andmask );
+ }
+ else {
+ VB->NdcPtr = NULL;
+ _mesa_clip_np_tab[VB->ClipPtr->size]( VB->ClipPtr,
+ NULL,
+ store->clipmask,
+ &store->ormask,
+ &store->andmask );
+ }
+
+ if (store->andmask) {
+ /* All vertices are outside the frustum */
+ return GL_FALSE;
+ }
+
+ /* Test userclip planes. This contributes to VB->ClipMask.
+ */
+ /** XXX NEW_SLANG _Enabled ??? */
+ if (ctx->Transform.ClipPlanesEnabled && (!ctx->VertexProgram._Enabled ||
+ ctx->VertexProgram.Current->IsPositionInvariant)) {
+ userclip( ctx,
+ VB->ClipPtr,
+ store->clipmask,
+ &store->ormask,
+ &store->andmask );
+
+ if (store->andmask) {
+ return GL_FALSE;
+ }
+ }
+
+ VB->ClipAndMask = store->andmask;
+ VB->ClipOrMask = store->ormask;
+ VB->ClipMask = store->clipmask;
+
+ return GL_TRUE;
+}
+
+
static void
vp_fetch_texel(GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda,
GLuint unit, GLfloat color[4])
@@ -85,22 +204,6 @@ _tnl_program_string(GLcontext *ctx, GLenum target, struct gl_program *program)
}
-/*!
- * Private storage for the vertex program pipeline stage.
- */
-struct vp_stage_data {
- /** The results of running the vertex program go into these arrays. */
- GLvector4f results[VERT_RESULT_MAX];
-
- GLvector4f ndcCoords; /**< normalized device coords */
- GLubyte *clipmask; /**< clip flags */
- GLubyte ormask, andmask; /**< for clipping */
-};
-
-
-#define VP_STAGE_DATA(stage) ((struct vp_stage_data *)(stage->privatePtr))
-
-
/**
* Initialize virtual machine state prior to executing vertex program.
*/
@@ -334,12 +437,39 @@ run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage )
}
}
+ if (program->IsPositionInvariant) {
+ /* We need the exact same transform as in the fixed function path here
+ to guarantee invariance, depending on compiler optimization flags results
+ could be different otherwise */
+ VB->ClipPtr = TransformRaw( &store->results[0],
+ &ctx->_ModelProjectMatrix,
+ VB->AttribPtr[0] );
+
+ /* Drivers expect this to be clean to element 4...
+ */
+ switch (VB->ClipPtr->size) {
+ case 1:
+ /* impossible */
+ case 2:
+ _mesa_vector4f_clean_elem( VB->ClipPtr, VB->Count, 2 );
+ /* fall-through */
+ case 3:
+ _mesa_vector4f_clean_elem( VB->ClipPtr, VB->Count, 3 );
+ /* fall-through */
+ case 4:
+ break;
+ }
+ }
+
+
/* Setup the VB pointers so that the next pipeline stages get
* their data from the right place (the program output arrays).
*/
- VB->ClipPtr = &store->results[VERT_RESULT_HPOS];
- VB->ClipPtr->size = 4;
- VB->ClipPtr->count = VB->Count;
+ else {
+ VB->ClipPtr = &store->results[VERT_RESULT_HPOS];
+ VB->ClipPtr->size = 4;
+ VB->ClipPtr->count = VB->Count;
+ }
VB->ColorPtr[0] = &store->results[VERT_RESULT_COL0];
VB->ColorPtr[1] = &store->results[VERT_RESULT_BFC0];
VB->SecondaryColorPtr[0] = &store->results[VERT_RESULT_COL1];
@@ -365,41 +495,10 @@ run_vp( GLcontext *ctx, struct tnl_pipeline_stage *stage )
}
}
- /* Cliptest and perspective divide. Clip functions must clear
- * the clipmask.
- */
- store->ormask = 0;
- store->andmask = CLIP_FRUSTUM_BITS;
- if (tnl->NeedNdcCoords) {
- VB->NdcPtr =
- _mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
- &store->ndcCoords,
- store->clipmask,
- &store->ormask,
- &store->andmask );
- }
- else {
- VB->NdcPtr = NULL;
- _mesa_clip_np_tab[VB->ClipPtr->size]( VB->ClipPtr,
- NULL,
- store->clipmask,
- &store->ormask,
- &store->andmask );
- }
-
- if (store->andmask) /* All vertices are outside the frustum */
- return GL_FALSE;
-
-
- /* This is where we'd do clip testing against the user-defined
- * clipping planes, but they're not supported by vertex programs.
+ /* Perform NDC and cliptest operations:
*/
-
- VB->ClipOrMask = store->ormask;
- VB->ClipMask = store->clipmask;
-
- return GL_TRUE;
+ return do_ndc_cliptest(ctx, store);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 01:11:37 +0000