sp_quad_coverage.c

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00001 /**************************************************************************
00002  * 
00003  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
00004  * All Rights Reserved.
00005  * 
00006  * Permission is hereby granted, free of charge, to any person obtaining a
00007  * copy of this software and associated documentation files (the
00008  * "Software"), to deal in the Software without restriction, including
00009  * without limitation the rights to use, copy, modify, merge, publish,
00010  * distribute, sub license, and/or sell copies of the Software, and to
00011  * permit persons to whom the Software is furnished to do so, subject to
00012  * the following conditions:
00013  * 
00014  * The above copyright notice and this permission notice (including the
00015  * next paragraph) shall be included in all copies or substantial portions
00016  * of the Software.
00017  * 
00018  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
00019  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00020  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
00021  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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00024  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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00026  **************************************************************************/
00027 
00028 
00035 #include "pipe/p_defines.h"
00036 #include "util/u_memory.h"
00037 #include "sp_context.h"
00038 #include "sp_headers.h"
00039 #include "sp_quad.h"
00040 
00041 
00045 static void
00046 coverage_quad(struct quad_stage *qs, struct quad_header *quad)
00047 {
00048    struct softpipe_context *softpipe = qs->softpipe;
00049 
00050    if ((softpipe->rasterizer->poly_smooth && quad->input.prim == PRIM_TRI) ||
00051        (softpipe->rasterizer->line_smooth && quad->input.prim == PRIM_LINE) ||
00052        (softpipe->rasterizer->point_smooth && quad->input.prim == PRIM_POINT)) {
00053       uint cbuf;
00054 
00055       /* loop over colorbuffer outputs */
00056       for (cbuf = 0; cbuf < softpipe->framebuffer.num_cbufs; cbuf++) {
00057          float (*quadColor)[4] = quad->output.color[cbuf];
00058          unsigned j;
00059          for (j = 0; j < QUAD_SIZE; j++) {
00060             assert(quad->input.coverage[j] >= 0.0);
00061             assert(quad->input.coverage[j] <= 1.0);
00062          quadColor[3][j] *= quad->input.coverage[j];
00063          }
00064       }
00065    }
00066 
00067    qs->next->run(qs->next, quad);
00068 }
00069 
00070 
00071 static void coverage_begin(struct quad_stage *qs)
00072 {
00073    qs->next->begin(qs->next);
00074 }
00075 
00076 
00077 static void coverage_destroy(struct quad_stage *qs)
00078 {
00079    FREE( qs );
00080 }
00081 
00082 
00083 struct quad_stage *sp_quad_coverage_stage( struct softpipe_context *softpipe )
00084 {
00085    struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
00086 
00087    stage->softpipe = softpipe;
00088    stage->begin = coverage_begin;
00089    stage->run = coverage_quad;
00090    stage->destroy = coverage_destroy;
00091 
00092    return stage;
00093 }

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