Merge branch 'master' of ssh://git.freedesktop.org/git/mesa/mesa into pipe-video
[mesa.git] / src / gallium / drivers / softpipe / sp_quad_fs.c
1 /**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 * Copyright 2008 VMware, Inc. All rights reserved.
6 *
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:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
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 TUNGSTEN GRAPHICS 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.
26 *
27 **************************************************************************/
28
29 /* Vertices are just an array of floats, with all the attributes
30 * packed. We currently assume a layout like:
31 *
32 * attr[0][0..3] - window position
33 * attr[1..n][0..3] - remaining attributes.
34 *
35 * Attributes are assumed to be 4 floats wide but are packed so that
36 * all the enabled attributes run contiguously.
37 */
38
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"
43
44 #include "sp_context.h"
45 #include "sp_state.h"
46 #include "sp_quad.h"
47 #include "sp_quad_pipe.h"
48
49
50 struct quad_shade_stage
51 {
52 struct quad_stage stage; /**< base class */
53
54 /* no other fields at this time */
55 };
56
57
58 /** cast wrapper */
59 static INLINE struct quad_shade_stage *
60 quad_shade_stage(struct quad_stage *qs)
61 {
62 return (struct quad_shade_stage *) qs;
63 }
64
65
66 /**
67 * Execute fragment shader for the four fragments in the quad.
68 * \return TRUE if quad is alive, FALSE if all four pixels are killed
69 */
70 static INLINE boolean
71 shade_quad(struct quad_stage *qs, struct quad_header *quad)
72 {
73 struct softpipe_context *softpipe = qs->softpipe;
74 struct tgsi_exec_machine *machine = softpipe->fs_machine;
75
76 /* run shader */
77 return softpipe->fs->run( softpipe->fs, machine, quad );
78 }
79
80
81
82 static void
83 coverage_quad(struct quad_stage *qs, struct quad_header *quad)
84 {
85 struct softpipe_context *softpipe = qs->softpipe;
86 uint cbuf;
87
88 /* loop over colorbuffer outputs */
89 for (cbuf = 0; cbuf < softpipe->framebuffer.nr_cbufs; cbuf++) {
90 float (*quadColor)[4] = quad->output.color[cbuf];
91 unsigned j;
92 for (j = 0; j < QUAD_SIZE; j++) {
93 assert(quad->input.coverage[j] >= 0.0);
94 assert(quad->input.coverage[j] <= 1.0);
95 quadColor[3][j] *= quad->input.coverage[j];
96 }
97 }
98 }
99
100
101 /**
102 * Shade/write an array of quads
103 * Called via quad_stage::run()
104 */
105 static void
106 shade_quads(struct quad_stage *qs,
107 struct quad_header *quads[],
108 unsigned nr)
109 {
110 struct softpipe_context *softpipe = qs->softpipe;
111 struct tgsi_exec_machine *machine = softpipe->fs_machine;
112 unsigned i, nr_quads = 0;
113
114 tgsi_exec_set_constant_buffers(machine, PIPE_MAX_CONSTANT_BUFFERS,
115 softpipe->mapped_constants[PIPE_SHADER_FRAGMENT],
116 softpipe->const_buffer_size[PIPE_SHADER_FRAGMENT]);
117
118 machine->InterpCoefs = quads[0]->coef;
119
120 for (i = 0; i < nr; i++) {
121 if (!shade_quad(qs, quads[i]))
122 continue; /* quad totally culled/killed */
123
124 if (/*do_coverage*/ 0)
125 coverage_quad( qs, quads[i] );
126
127 quads[nr_quads++] = quads[i];
128 }
129
130 if (nr_quads)
131 qs->next->run(qs->next, quads, nr_quads);
132 }
133
134
135 /**
136 * Per-primitive (or per-begin?) setup
137 */
138 static void
139 shade_begin(struct quad_stage *qs)
140 {
141 struct softpipe_context *softpipe = qs->softpipe;
142
143 softpipe->fs->prepare( softpipe->fs,
144 softpipe->fs_machine,
145 (struct tgsi_sampler **)
146 softpipe->tgsi.frag_samplers_list );
147
148 qs->next->begin(qs->next);
149 }
150
151
152 static void
153 shade_destroy(struct quad_stage *qs)
154 {
155 FREE( qs );
156 }
157
158
159 struct quad_stage *
160 sp_quad_shade_stage( struct softpipe_context *softpipe )
161 {
162 struct quad_shade_stage *qss = CALLOC_STRUCT(quad_shade_stage);
163 if (!qss)
164 goto fail;
165
166 qss->stage.softpipe = softpipe;
167 qss->stage.begin = shade_begin;
168 qss->stage.run = shade_quads;
169 qss->stage.destroy = shade_destroy;
170
171 return &qss->stage;
172
173 fail:
174 FREE(qss);
175 return NULL;
176 }