89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/**************************************************************************
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*
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* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
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* 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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* 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
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* \brief Apply AA coverage to quad alpha valus
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* \author Brian Paul
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*/
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#include "pipe/p_defines.h"
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#include "pipe/p_util.h"
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#include "sp_context.h"
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#include "sp_headers.h"
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#include "sp_quad.h"
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/**
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* Multiply quad's alpha values by the fragment coverage.
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*/
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static void
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coverage_quad(struct quad_stage *qs, struct quad_header *quad)
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{
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struct softpipe_context *softpipe = qs->softpipe;
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if ((softpipe->rasterizer->poly_smooth && quad->prim == PRIM_TRI) ||
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(softpipe->rasterizer->line_smooth && quad->prim == PRIM_LINE) ||
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(softpipe->rasterizer->point_smooth && quad->prim == PRIM_POINT)) {
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float (*quadColor)[4] = quad->outputs.color;
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unsigned j;
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for (j = 0; j < QUAD_SIZE; j++) {
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assert(quad->coverage[j] >= 0.0);
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assert(quad->coverage[j] <= 1.0);
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quadColor[3][j] *= quad->coverage[j];
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}
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}
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qs->next->run(qs->next, quad);
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}
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static void coverage_begin(struct quad_stage *qs)
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{
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qs->next->begin(qs->next);
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}
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static void coverage_destroy(struct quad_stage *qs)
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{
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FREE( qs );
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}
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struct quad_stage *sp_quad_coverage_stage( struct softpipe_context *softpipe )
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{
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struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
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stage->softpipe = softpipe;
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stage->begin = coverage_begin;
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stage->run = coverage_quad;
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stage->destroy = coverage_destroy;
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return stage;
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}
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