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 *
quad_shade_stage(struct quad_stage * qs)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
shade_quad(struct quad_stage * qs,struct quad_header * quad)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 machine->flatshade_color = softpipe->rasterizer->flatshade ? TRUE : FALSE;
78 return softpipe->fs_variant->run( softpipe->fs_variant, machine, quad );
79 }
80
81
82
83 static void
coverage_quad(struct quad_stage * qs,struct quad_header * quad)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 < TGSI_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
shade_quads(struct quad_stage * qs,struct quad_header * quads[],unsigned nr)107 shade_quads(struct quad_stage *qs,
108 struct quad_header *quads[],
109 unsigned nr)
110 {
111 struct softpipe_context *softpipe = qs->softpipe;
112 struct tgsi_exec_machine *machine = softpipe->fs_machine;
113 unsigned i, nr_quads = 0;
114
115 tgsi_exec_set_constant_buffers(machine, PIPE_MAX_CONSTANT_BUFFERS,
116 softpipe->mapped_constants[PIPE_SHADER_FRAGMENT],
117 softpipe->const_buffer_size[PIPE_SHADER_FRAGMENT]);
118
119 machine->InterpCoefs = quads[0]->coef;
120
121 for (i = 0; i < nr; i++) {
122 /* Only omit this quad from the output list if all the fragments
123 * are killed _AND_ it's not the first quad in the list.
124 * The first quad is special in the (optimized) depth-testing code:
125 * the quads' Z coordinates are step-wise interpolated with respect
126 * to the first quad in the list.
127 * For multi-pass algorithms we need to produce exactly the same
128 * Z values in each pass. If interpolation starts with different quads
129 * we can get different Z values for the same (x,y).
130 */
131 if (!shade_quad(qs, quads[i]) && i > 0)
132 continue; /* quad totally culled/killed */
133
134 if (/*do_coverage*/ 0)
135 coverage_quad( qs, quads[i] );
136
137 quads[nr_quads++] = quads[i];
138 }
139
140 if (nr_quads)
141 qs->next->run(qs->next, quads, nr_quads);
142 }
143
144
145 /**
146 * Per-primitive (or per-begin?) setup
147 */
148 static void
shade_begin(struct quad_stage * qs)149 shade_begin(struct quad_stage *qs)
150 {
151 qs->next->begin(qs->next);
152 }
153
154
155 static void
shade_destroy(struct quad_stage * qs)156 shade_destroy(struct quad_stage *qs)
157 {
158 FREE( qs );
159 }
160
161
162 struct quad_stage *
sp_quad_shade_stage(struct softpipe_context * softpipe)163 sp_quad_shade_stage( struct softpipe_context *softpipe )
164 {
165 struct quad_shade_stage *qss = CALLOC_STRUCT(quad_shade_stage);
166 if (!qss)
167 goto fail;
168
169 qss->stage.softpipe = softpipe;
170 qss->stage.begin = shade_begin;
171 qss->stage.run = shade_quads;
172 qss->stage.destroy = shade_destroy;
173
174 return &qss->stage;
175
176 fail:
177 FREE(qss);
178 return NULL;
179 }
180