diff options
| -rw-r--r-- | src/mesa/tnl/t_vb_program.c | 203 |
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); } |