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fix position invariant vertex programs for sw-tnl

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do the same math as for fixed function pipe, including
user clip planes.
(mostly resurrected from the dead t_vb_arbprogram.c code)
This commit is contained in:
Roland Scheidegger
2007-11-15 00:52:38 +01:00
parent f6ab1347d6
commit dab7c810e9
1 changed files with 152 additions and 53 deletions
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199
src/mesa/tnl/t_vb_program.c
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@@ -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).
*/
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.
/* Perform NDC and cliptest operations:
*/
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.
*/
VB->ClipOrMask = store->ormask;
VB->ClipMask = store->clipmask;
return GL_TRUE;
return do_ndc_cliptest(ctx, store);
}