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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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, sub license, 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 (including the
* next paragraph) 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 NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
*
**************************************************************************/
/**
* \brief Apply AA coverage to quad alpha valus
* \author Brian Paul
*/
#include "main/glheader.h"
#include "main/macros.h"
#include "pipe/p_defines.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_quad.h"
/**
* Multiply quad's alpha values by the fragment coverage.
*/
static void
coverage_quad(struct quad_stage *qs, struct quad_header *quad)
{
struct softpipe_context *softpipe = qs->softpipe;
if ((softpipe->setup.poly_smooth && quad->prim == PRIM_TRI) ||
(softpipe->setup.line_smooth && quad->prim == PRIM_LINE) ||
(softpipe->setup.point_smooth && quad->prim == PRIM_POINT)) {
GLuint j;
for (j = 0; j < QUAD_SIZE; j++) {
assert(quad->coverage[j] >= 0.0);
assert(quad->coverage[j] <= 1.0);
quad->outputs.color[3][j] *= quad->coverage[j];
}
}
qs->next->run(qs->next, quad);
}
struct quad_stage *sp_quad_coverage_stage( struct softpipe_context *softpipe )
{
struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
stage->softpipe = softpipe;
stage->run = coverage_quad;
return stage;
}
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