diff options
Diffstat (limited to 'src/gallium/drivers/softpipe/sp_quad_coverage.c')
-rw-r--r-- | src/gallium/drivers/softpipe/sp_quad_coverage.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/gallium/drivers/softpipe/sp_quad_coverage.c b/src/gallium/drivers/softpipe/sp_quad_coverage.c new file mode 100644 index 0000000..b3d3fae --- /dev/null +++ b/src/gallium/drivers/softpipe/sp_quad_coverage.c @@ -0,0 +1,88 @@ +/************************************************************************** + * + * 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 "pipe/p_defines.h" +#include "pipe/p_util.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->rasterizer->poly_smooth && quad->prim == PRIM_TRI) || + (softpipe->rasterizer->line_smooth && quad->prim == PRIM_LINE) || + (softpipe->rasterizer->point_smooth && quad->prim == PRIM_POINT)) { + float (*quadColor)[4] = quad->outputs.color; + unsigned j; + for (j = 0; j < QUAD_SIZE; j++) { + assert(quad->coverage[j] >= 0.0); + assert(quad->coverage[j] <= 1.0); + quadColor[3][j] *= quad->coverage[j]; + } + } + + qs->next->run(qs->next, quad); +} + + +static void coverage_begin(struct quad_stage *qs) +{ + qs->next->begin(qs->next); +} + + +static void coverage_destroy(struct quad_stage *qs) +{ + FREE( qs ); +} + + +struct quad_stage *sp_quad_coverage_stage( struct softpipe_context *softpipe ) +{ + struct quad_stage *stage = CALLOC_STRUCT(quad_stage); + + stage->softpipe = softpipe; + stage->begin = coverage_begin; + stage->run = coverage_quad; + stage->destroy = coverage_destroy; + + return stage; +} |