112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
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/*
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* Mesa 3-D graphics library
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* Version: 6.1
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*
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* Copyright (C) 1999-2004 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 "glheader.h"
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#include "colormac.h"
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#include "context.h"
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#include "macros.h"
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#include "imports.h"
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#include "mtypes.h"
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#include "math/m_xform.h"
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#include "t_context.h"
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#include "t_pipeline.h"
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/* EXT_vertex_cull. Not really a big win, but probably depends on
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* your application. This stage not included in the default pipeline.
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*/
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static GLboolean run_cull_stage( GLcontext *ctx,
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struct tnl_pipeline_stage *stage )
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{
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TNLcontext *tnl = TNL_CONTEXT(ctx);
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struct vertex_buffer *VB = &tnl->vb;
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const GLfloat a = ctx->Transform.CullObjPos[0];
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const GLfloat b = ctx->Transform.CullObjPos[1];
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const GLfloat c = ctx->Transform.CullObjPos[2];
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GLfloat *norm = (GLfloat *)VB->NormalPtr->data;
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GLuint stride = VB->NormalPtr->stride;
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GLuint count = VB->Count;
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GLuint i;
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VB->ClipOrMask &= ~CLIP_CULL_BIT;
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VB->ClipAndMask |= CLIP_CULL_BIT;
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for (i = 0 ; i < count ; i++) {
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GLfloat dp = (norm[0] * a +
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norm[1] * b +
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norm[2] * c);
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if (dp < 0) {
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VB->ClipMask[i] |= CLIP_CULL_BIT;
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VB->ClipOrMask |= CLIP_CULL_BIT;
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}
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else {
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VB->ClipMask[i] &= ~CLIP_CULL_BIT;
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VB->ClipAndMask &= ~CLIP_CULL_BIT;
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}
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STRIDE_F(norm, stride);
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}
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return !(VB->ClipAndMask & CLIP_CULL_BIT);
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}
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static void check_cull( GLcontext *ctx, struct tnl_pipeline_stage *stage )
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{
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stage->active = (!ctx->VertexProgram._Enabled &&
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ctx->Transform.CullVertexFlag);
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}
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static void dtr( struct tnl_pipeline_stage *stage )
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{
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}
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const struct tnl_pipeline_stage _tnl_vertex_cull_stage =
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{
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"EXT_cull_vertex",
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_NEW_PROGRAM |
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_NEW_TRANSFORM,
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_NEW_TRANSFORM,
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GL_TRUE, /* active */
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_TNL_BIT_NORMAL |
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_TNL_BIT_POS, /* inputs */
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_TNL_BIT_POS, /* outputs */
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0, /* changed_inputs */
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NULL, /* private data */
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dtr, /* destructor */
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check_cull, /* check */
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run_cull_stage /* run -- initially set to init */
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};
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