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249 lines
6.7 KiB
C
249 lines
6.7 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.5
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*
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* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Keith Whitwell <keith@tungstengraphics.com>
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*/
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#include <precomp.h>
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struct vertex_stage_data {
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GLvector4f eye;
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GLvector4f clip;
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GLvector4f proj;
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GLubyte *clipmask;
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GLubyte ormask;
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GLubyte andmask;
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};
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#define VERTEX_STAGE_DATA(stage) ((struct vertex_stage_data *)stage->privatePtr)
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/* This function implements cliptesting for user-defined clip planes.
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* The clipping of primitives to these planes is implemented in
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* t_render_clip.h.
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*/
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#define USER_CLIPTEST(NAME, SZ) \
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static void NAME( struct gl_context *ctx, \
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GLvector4f *clip, \
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GLubyte *clipmask, \
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GLubyte *clipormask, \
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GLubyte *clipandmask ) \
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{ \
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GLuint p; \
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\
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for (p = 0; p < ctx->Const.MaxClipPlanes; p++) \
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if (ctx->Transform.ClipPlanesEnabled & (1 << p)) { \
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GLuint nr, i; \
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const GLfloat a = ctx->Transform._ClipUserPlane[p][0]; \
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const GLfloat b = ctx->Transform._ClipUserPlane[p][1]; \
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const GLfloat c = ctx->Transform._ClipUserPlane[p][2]; \
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const GLfloat d = ctx->Transform._ClipUserPlane[p][3]; \
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GLfloat *coord = (GLfloat *)clip->data; \
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GLuint stride = clip->stride; \
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GLuint count = clip->count; \
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\
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for (nr = 0, i = 0 ; i < count ; i++) { \
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GLfloat dp = coord[0] * a + coord[1] * b; \
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if (SZ > 2) dp += coord[2] * c; \
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if (SZ > 3) dp += coord[3] * d; else dp += d; \
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\
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if (dp < 0) { \
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nr++; \
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clipmask[i] |= CLIP_USER_BIT; \
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} \
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\
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STRIDE_F(coord, stride); \
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} \
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\
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if (nr > 0) { \
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*clipormask |= CLIP_USER_BIT; \
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if (nr == count) { \
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*clipandmask |= CLIP_USER_BIT; \
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return; \
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} \
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} \
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} \
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}
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USER_CLIPTEST(userclip2, 2)
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USER_CLIPTEST(userclip3, 3)
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USER_CLIPTEST(userclip4, 4)
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static void (*(usercliptab[5]))( struct gl_context *,
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GLvector4f *, GLubyte *,
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GLubyte *, GLubyte * ) =
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{
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NULL,
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NULL,
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userclip2,
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userclip3,
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userclip4
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};
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static GLboolean run_vertex_stage( struct gl_context *ctx,
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struct tnl_pipeline_stage *stage )
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{
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struct vertex_stage_data *store = (struct vertex_stage_data *)stage->privatePtr;
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TNLcontext *tnl = TNL_CONTEXT(ctx);
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struct vertex_buffer *VB = &tnl->vb;
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if (ctx->_NeedEyeCoords) {
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/* Separate modelview transformation:
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* Use combined ModelProject to avoid some depth artifacts
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*/
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if (ctx->ModelviewMatrixStack.Top->type == MATRIX_IDENTITY)
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VB->EyePtr = VB->AttribPtr[_TNL_ATTRIB_POS];
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else
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VB->EyePtr = TransformRaw( &store->eye,
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ctx->ModelviewMatrixStack.Top,
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VB->AttribPtr[_TNL_ATTRIB_POS]);
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}
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VB->ClipPtr = TransformRaw( &store->clip,
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&ctx->_ModelProjectMatrix,
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VB->AttribPtr[_TNL_ATTRIB_POS] );
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/* Drivers expect this to be clean to element 4...
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*/
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switch (VB->ClipPtr->size) {
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case 1:
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/* impossible */
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case 2:
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_mesa_vector4f_clean_elem( VB->ClipPtr, VB->Count, 2 );
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/* fall-through */
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case 3:
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_mesa_vector4f_clean_elem( VB->ClipPtr, VB->Count, 3 );
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/* fall-through */
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case 4:
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break;
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}
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/* Cliptest and perspective divide. Clip functions must clear
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* the clipmask.
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*/
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store->ormask = 0;
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store->andmask = CLIP_FRUSTUM_BITS;
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if (tnl->NeedNdcCoords) {
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VB->NdcPtr =
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_mesa_clip_tab[VB->ClipPtr->size]( VB->ClipPtr,
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&store->proj,
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store->clipmask,
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&store->ormask,
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&store->andmask);
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}
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else {
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VB->NdcPtr = NULL;
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_mesa_clip_np_tab[VB->ClipPtr->size]( VB->ClipPtr,
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NULL,
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store->clipmask,
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&store->ormask,
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&store->andmask );
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}
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if (store->andmask)
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return GL_FALSE;
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/* Test userclip planes. This contributes to VB->ClipMask, so
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* is essentially required to be in this stage.
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*/
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if (ctx->Transform.ClipPlanesEnabled) {
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usercliptab[VB->ClipPtr->size]( ctx,
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VB->ClipPtr,
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store->clipmask,
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&store->ormask,
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&store->andmask );
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if (store->andmask)
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return GL_FALSE;
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}
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VB->ClipAndMask = store->andmask;
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VB->ClipOrMask = store->ormask;
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VB->ClipMask = store->clipmask;
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return GL_TRUE;
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}
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static GLboolean init_vertex_stage( struct gl_context *ctx,
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struct tnl_pipeline_stage *stage )
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{
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struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
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struct vertex_stage_data *store;
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GLuint size = VB->Size;
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stage->privatePtr = CALLOC(sizeof(*store));
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store = VERTEX_STAGE_DATA(stage);
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if (!store)
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return GL_FALSE;
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_mesa_vector4f_alloc( &store->eye, 0, size, 32 );
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_mesa_vector4f_alloc( &store->clip, 0, size, 32 );
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_mesa_vector4f_alloc( &store->proj, 0, size, 32 );
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store->clipmask = (GLubyte *) _mesa_align_malloc(sizeof(GLubyte)*size, 32 );
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if (!store->clipmask ||
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!store->eye.data ||
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!store->clip.data ||
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!store->proj.data)
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return GL_FALSE;
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return GL_TRUE;
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}
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static void dtr( struct tnl_pipeline_stage *stage )
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{
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struct vertex_stage_data *store = VERTEX_STAGE_DATA(stage);
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if (store) {
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_mesa_vector4f_free( &store->eye );
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_mesa_vector4f_free( &store->clip );
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_mesa_vector4f_free( &store->proj );
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_mesa_align_free( store->clipmask );
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FREE(store);
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stage->privatePtr = NULL;
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stage->run = init_vertex_stage;
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}
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}
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const struct tnl_pipeline_stage _tnl_vertex_transform_stage =
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{
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"modelview/project/cliptest/divide",
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NULL, /* private data */
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init_vertex_stage,
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dtr, /* destructor */
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NULL,
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run_vertex_stage /* run -- initially set to init */
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};
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