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
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21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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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 Quad occlusion counter stage
35 #include "pipe/p_defines.h"
36 #include "util/u_memory.h"
37 #include "sp_context.h"
39 #include "sp_surface.h"
40 #include "sp_quad_pipe.h"
42 static unsigned count_bits( unsigned val
)
46 for (i
= 0; val
; val
>>= 1)
53 occlusion_count_quad(struct quad_stage
*qs
, struct quad_header
*quad
)
55 struct softpipe_context
*softpipe
= qs
->softpipe
;
57 softpipe
->occlusion_count
+= count_bits(quad
->inout
.mask
);
59 qs
->next
->run(qs
->next
, quad
);
63 static void occlusion_begin(struct quad_stage
*qs
)
65 qs
->next
->begin(qs
->next
);
69 static void occlusion_destroy(struct quad_stage
*qs
)
75 struct quad_stage
*sp_quad_occlusion_stage( struct softpipe_context
*softpipe
)
77 struct quad_stage
*stage
= CALLOC_STRUCT(quad_stage
);
79 stage
->softpipe
= softpipe
;
80 stage
->begin
= occlusion_begin
;
81 stage
->run
= occlusion_count_quad
;
82 stage
->destroy
= occlusion_destroy
;