softpipe: comments and whitespace fixes
[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 struct tgsi_exec_machine *machine;
54 struct tgsi_exec_vector *inputs, *outputs;
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 quad_shade_stage *qss = quad_shade_stage( qs );
74 struct softpipe_context *softpipe = qs->softpipe;
75 struct tgsi_exec_machine *machine = qss->machine;
76
77 /* run shader */
78 return softpipe->fs->run( softpipe->fs, machine, quad );
79 }
80
81
82
83 static void
84 coverage_quad(struct quad_stage *qs, struct quad_header *quad)
85 {
86 struct softpipe_context *softpipe = qs->softpipe;
87 uint cbuf;
88
89 /* loop over colorbuffer outputs */
90 for (cbuf = 0; cbuf < softpipe->framebuffer.nr_cbufs; cbuf++) {
91 float (*quadColor)[4] = quad->output.color[cbuf];
92 unsigned j;
93 for (j = 0; j < QUAD_SIZE; j++) {
94 assert(quad->input.coverage[j] >= 0.0);
95 assert(quad->input.coverage[j] <= 1.0);
96 quadColor[3][j] *= quad->input.coverage[j];
97 }
98 }
99 }
100
101
102 /**
103 * Shade/write an array of quads
104 * Called via quad_stage::run()
105 */
106 static void
107 shade_quads(struct quad_stage *qs,
108 struct quad_header *quads[],
109 unsigned nr)
110 {
111 struct quad_shade_stage *qss = quad_shade_stage( qs );
112 struct softpipe_context *softpipe = qs->softpipe;
113 struct tgsi_exec_machine *machine = qss->machine;
114 unsigned i, pass = 0;
115
116 for (i = 0; i < PIPE_MAX_CONSTANT_BUFFERS; i++) {
117 machine->Consts[i] = softpipe->mapped_constants[PIPE_SHADER_FRAGMENT][i];
118 }
119 machine->InterpCoefs = quads[0]->coef;
120
121 for (i = 0; i < nr; i++) {
122 if (!shade_quad(qs, quads[i]))
123 continue; /* quad totally culled/killed */
124
125 if (/*do_coverage*/ 0)
126 coverage_quad( qs, quads[i] );
127
128 quads[pass++] = quads[i];
129 }
130
131 if (pass)
132 qs->next->run(qs->next, quads, pass);
133 }
134
135
136 /**
137 * Per-primitive (or per-begin?) setup
138 */
139 static void
140 shade_begin(struct quad_stage *qs)
141 {
142 struct quad_shade_stage *qss = quad_shade_stage(qs);
143 struct softpipe_context *softpipe = qs->softpipe;
144
145 softpipe->fs->prepare( softpipe->fs,
146 qss->machine,
147 (struct tgsi_sampler **)
148 softpipe->tgsi.frag_samplers_list );
149
150 qs->next->begin(qs->next);
151 }
152
153
154 static void
155 shade_destroy(struct quad_stage *qs)
156 {
157 struct quad_shade_stage *qss = (struct quad_shade_stage *) qs;
158
159 tgsi_exec_machine_destroy(qss->machine);
160
161 FREE( qs );
162 }
163
164
165 struct quad_stage *
166 sp_quad_shade_stage( struct softpipe_context *softpipe )
167 {
168 struct quad_shade_stage *qss = CALLOC_STRUCT(quad_shade_stage);
169 if (!qss)
170 goto fail;
171
172 qss->stage.softpipe = softpipe;
173 qss->stage.begin = shade_begin;
174 qss->stage.run = shade_quads;
175 qss->stage.destroy = shade_destroy;
176
177 qss->machine = tgsi_exec_machine_create();
178 if (!qss->machine)
179 goto fail;
180
181 return &qss->stage;
182
183 fail:
184 if (qss && qss->machine)
185 tgsi_exec_machine_destroy(qss->machine);
186
187 FREE(qss);
188 return NULL;
189 }