1 /**************************************************************************
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
30 * \brief Apply AA coverage to quad alpha valus
35 #include "pipe/p_defines.h"
36 #include "util/u_memory.h"
37 #include "sp_context.h"
38 #include "sp_headers.h"
43 * Multiply quad's alpha values by the fragment coverage.
46 coverage_quad(struct quad_stage
*qs
, struct quad_header
*quad
)
48 struct softpipe_context
*softpipe
= qs
->softpipe
;
50 if ((softpipe
->rasterizer
->poly_smooth
&& quad
->input
.prim
== PRIM_TRI
) ||
51 (softpipe
->rasterizer
->line_smooth
&& quad
->input
.prim
== PRIM_LINE
) ||
52 (softpipe
->rasterizer
->point_smooth
&& quad
->input
.prim
== PRIM_POINT
)) {
55 /* loop over colorbuffer outputs */
56 for (cbuf
= 0; cbuf
< softpipe
->framebuffer
.num_cbufs
; cbuf
++) {
57 float (*quadColor
)[4] = quad
->output
.color
[cbuf
];
59 for (j
= 0; j
< QUAD_SIZE
; j
++) {
60 assert(quad
->input
.coverage
[j
] >= 0.0);
61 assert(quad
->input
.coverage
[j
] <= 1.0);
62 quadColor
[3][j
] *= quad
->input
.coverage
[j
];
67 qs
->next
->run(qs
->next
, quad
);
71 static void coverage_begin(struct quad_stage
*qs
)
73 qs
->next
->begin(qs
->next
);
77 static void coverage_destroy(struct quad_stage
*qs
)
83 struct quad_stage
*sp_quad_coverage_stage( struct softpipe_context
*softpipe
)
85 struct quad_stage
*stage
= CALLOC_STRUCT(quad_stage
);
87 stage
->softpipe
= softpipe
;
88 stage
->begin
= coverage_begin
;
89 stage
->run
= coverage_quad
;
90 stage
->destroy
= coverage_destroy
;