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Diffstat (limited to 'src/mesa/tnl/t_vb_vertex.c')
-rw-r--r--src/mesa/tnl/t_vb_vertex.c267
1 files changed, 267 insertions, 0 deletions
diff --git a/src/mesa/tnl/t_vb_vertex.c b/src/mesa/tnl/t_vb_vertex.c
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index 00000000000..e0a58aaaf3e
--- /dev/null
+++ b/src/mesa/tnl/t_vb_vertex.c
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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5
+ *
+ * Copyright (C) 1999-2006 Brian Paul 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, sublicense,
+ * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL 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 "glheader.h"
+#include "colormac.h"
+#include "context.h"
+#include "macros.h"
+#include "imports.h"
+#include "mtypes.h"
+
+#include "math/m_xform.h"
+
+#include "t_context.h"
+#include "t_pipeline.h"
+
+
+
+struct vertex_stage_data {
+ GLvector4f eye;
+ GLvector4f clip;
+ GLvector4f proj;
+ GLubyte *clipmask;
+ GLubyte ormask;
+ GLubyte andmask;
+};
+
+#define VERTEX_STAGE_DATA(stage) ((struct vertex_stage_data *)stage->privatePtr)
+
+
+
+
+/* This function implements cliptesting for user-defined clip planes.
+ * The clipping of primitives to these planes is implemented in
+ * t_render_clip.h.
+ */
+#define USER_CLIPTEST(NAME, SZ) \
+static void NAME( 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; \
+ if (SZ > 2) dp += coord[2] * c; \
+ if (SZ > 3) dp += coord[3] * d; else dp += 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; \
+ } \
+ } \
+ } \
+}
+
+
+USER_CLIPTEST(userclip2, 2)
+USER_CLIPTEST(userclip3, 3)
+USER_CLIPTEST(userclip4, 4)
+
+static void (*(usercliptab[5]))( GLcontext *,
+ GLvector4f *, GLubyte *,
+ GLubyte *, GLubyte * ) =
+{
+ NULL,
+ NULL,
+ userclip2,
+ userclip3,
+ userclip4
+};
+
+
+
+static GLboolean run_vertex_stage( GLcontext *ctx,
+ struct tnl_pipeline_stage *stage )
+{
+ struct vertex_stage_data *store = (struct vertex_stage_data *)stage->privatePtr;
+ TNLcontext *tnl = TNL_CONTEXT(ctx);
+ struct vertex_buffer *VB = &tnl->vb;
+
+ if (ctx->ShaderObjects._VertexShaderPresent)
+ return GL_TRUE;
+
+ if (ctx->VertexProgram._Enabled)
+ return GL_TRUE;
+
+ if (ctx->_NeedEyeCoords) {
+ /* Separate modelview transformation:
+ * Use combined ModelProject to avoid some depth artifacts
+ */
+ if (ctx->ModelviewMatrixStack.Top->type == MATRIX_IDENTITY)
+ VB->EyePtr = VB->ObjPtr;
+ else
+ VB->EyePtr = TransformRaw( &store->eye,
+ ctx->ModelviewMatrixStack.Top,
+ VB->ObjPtr);
+ }
+
+ VB->ClipPtr = TransformRaw( &store->clip,
+ &ctx->_ModelProjectMatrix,
+ VB->ObjPtr );
+
+ /* 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;
+ }
+
+
+ /* Cliptest and perspective divide. Clip functions must clear
+ * the clipmask.
+ */
+ store->ormask = 0;
+ store->andmask = CLIP_ALL_BITS;
+
+ if (tnl->NeedNdcCoords) {
+ VB->NdcPtr =
+ _mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
+ &store->proj,
+ 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)
+ return GL_FALSE;
+
+
+ /* Test userclip planes. This contributes to VB->ClipMask, so
+ * is essentially required to be in this stage.
+ */
+ if (ctx->Transform.ClipPlanesEnabled) {
+ usercliptab[VB->ClipPtr->size]( 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 GLboolean init_vertex_stage( GLcontext *ctx,
+ struct tnl_pipeline_stage *stage )
+{
+ struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
+ struct vertex_stage_data *store;
+ GLuint size = VB->Size;
+
+ stage->privatePtr = CALLOC(sizeof(*store));
+ store = VERTEX_STAGE_DATA(stage);
+ if (!store)
+ return GL_FALSE;
+
+ _mesa_vector4f_alloc( &store->eye, 0, size, 32 );
+ _mesa_vector4f_alloc( &store->clip, 0, size, 32 );
+ _mesa_vector4f_alloc( &store->proj, 0, size, 32 );
+
+ store->clipmask = (GLubyte *) ALIGN_MALLOC(sizeof(GLubyte)*size, 32 );
+
+ if (!store->clipmask ||
+ !store->eye.data ||
+ !store->clip.data ||
+ !store->proj.data)
+ return GL_FALSE;
+
+ return GL_TRUE;
+}
+
+static void dtr( struct tnl_pipeline_stage *stage )
+{
+ struct vertex_stage_data *store = VERTEX_STAGE_DATA(stage);
+
+ if (store) {
+ _mesa_vector4f_free( &store->eye );
+ _mesa_vector4f_free( &store->clip );
+ _mesa_vector4f_free( &store->proj );
+ ALIGN_FREE( store->clipmask );
+ FREE(store);
+ stage->privatePtr = NULL;
+ stage->run = init_vertex_stage;
+ }
+}
+
+
+const struct tnl_pipeline_stage _tnl_vertex_transform_stage =
+{
+ "modelview/project/cliptest/divide",
+ NULL, /* private data */
+ init_vertex_stage,
+ dtr, /* destructor */
+ NULL,
+ run_vertex_stage /* run -- initially set to init */
+};
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