1 /**************************************************************************
3 * Copyright 2007 VMware, Inc.
5 * Copyright 2008 VMware, Inc. All rights reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 **************************************************************************/
29 /* Vertices are just an array of floats, with all the attributes
30 * packed. We currently assume a layout like:
32 * attr[0][0..3] - window position
33 * attr[1..n][0..3] - remaining attributes.
35 * Attributes are assumed to be 4 floats wide but are packed so that
36 * all the enabled attributes run contiguously.
39 #include "util/u_math.h"
40 #include "util/u_memory.h"
41 #include "pipe/p_defines.h"
42 #include "pipe/p_shader_tokens.h"
44 #include "sp_context.h"
47 #include "sp_quad_pipe.h"
50 struct quad_shade_stage
52 struct quad_stage stage
; /**< base class */
54 /* no other fields at this time */
59 * Execute fragment shader for the four fragments in the quad.
60 * \return TRUE if quad is alive, FALSE if all four pixels are killed
63 shade_quad(struct quad_stage
*qs
, struct quad_header
*quad
)
65 struct softpipe_context
*softpipe
= qs
->softpipe
;
66 struct tgsi_exec_machine
*machine
= softpipe
->fs_machine
;
68 if (softpipe
->active_statistics_queries
) {
69 softpipe
->pipeline_statistics
.ps_invocations
+=
70 util_bitcount(quad
->inout
.mask
);
74 machine
->flatshade_color
= softpipe
->rasterizer
->flatshade
? TRUE
: FALSE
;
75 return softpipe
->fs_variant
->run( softpipe
->fs_variant
, machine
, quad
, softpipe
->early_depth
);
81 coverage_quad(struct quad_stage
*qs
, struct quad_header
*quad
)
83 struct softpipe_context
*softpipe
= qs
->softpipe
;
86 /* loop over colorbuffer outputs */
87 for (cbuf
= 0; cbuf
< softpipe
->framebuffer
.nr_cbufs
; cbuf
++) {
88 float (*quadColor
)[4] = quad
->output
.color
[cbuf
];
90 for (j
= 0; j
< TGSI_QUAD_SIZE
; j
++) {
91 assert(quad
->input
.coverage
[j
] >= 0.0);
92 assert(quad
->input
.coverage
[j
] <= 1.0);
93 quadColor
[3][j
] *= quad
->input
.coverage
[j
];
100 * Shade/write an array of quads
101 * Called via quad_stage::run()
104 shade_quads(struct quad_stage
*qs
,
105 struct quad_header
*quads
[],
108 struct softpipe_context
*softpipe
= qs
->softpipe
;
109 struct tgsi_exec_machine
*machine
= softpipe
->fs_machine
;
110 unsigned i
, nr_quads
= 0;
112 tgsi_exec_set_constant_buffers(machine
, PIPE_MAX_CONSTANT_BUFFERS
,
113 softpipe
->mapped_constants
[PIPE_SHADER_FRAGMENT
],
114 softpipe
->const_buffer_size
[PIPE_SHADER_FRAGMENT
]);
116 machine
->InterpCoefs
= quads
[0]->coef
;
118 for (i
= 0; i
< nr
; i
++) {
119 /* Only omit this quad from the output list if all the fragments
120 * are killed _AND_ it's not the first quad in the list.
121 * The first quad is special in the (optimized) depth-testing code:
122 * the quads' Z coordinates are step-wise interpolated with respect
123 * to the first quad in the list.
124 * For multi-pass algorithms we need to produce exactly the same
125 * Z values in each pass. If interpolation starts with different quads
126 * we can get different Z values for the same (x,y).
128 if (!shade_quad(qs
, quads
[i
]) && i
> 0)
129 continue; /* quad totally culled/killed */
131 if (/*do_coverage*/ 0)
132 coverage_quad( qs
, quads
[i
] );
134 quads
[nr_quads
++] = quads
[i
];
138 qs
->next
->run(qs
->next
, quads
, nr_quads
);
143 * Per-primitive (or per-begin?) setup
146 shade_begin(struct quad_stage
*qs
)
148 qs
->next
->begin(qs
->next
);
153 shade_destroy(struct quad_stage
*qs
)
160 sp_quad_shade_stage( struct softpipe_context
*softpipe
)
162 struct quad_shade_stage
*qss
= CALLOC_STRUCT(quad_shade_stage
);
166 qss
->stage
.softpipe
= softpipe
;
167 qss
->stage
.begin
= shade_begin
;
168 qss
->stage
.run
= shade_quads
;
169 qss
->stage
.destroy
= shade_destroy
;