1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* Mesa 3-D graphics library
* Version: 6.5
*
* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \brief Quad depth testing
*/
#include "main/glheader.h"
#include "main/imports.h"
#include "pipe/p_defines.h"
#include "sp_context.h"
#include "sp_headers.h"
#include "sp_surface.h"
#include "sp_quad.h"
/**
* Do depth testing for a quad.
* Not static since it's used by the stencil code.
*/
void
sp_depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
struct softpipe_context *softpipe = qs->softpipe;
struct softpipe_surface *sps = softpipe_surface(softpipe->framebuffer.zbuf);
GLuint bzzzz[QUAD_SIZE]; /**< Z values fetched from depth buffer */
GLuint qzzzz[QUAD_SIZE]; /**< Z values from the quad */
GLuint zmask = 0;
GLuint j;
GLfloat scale;
assert(sps); /* shouldn't get here if there's no zbuffer */
/*
* To increase efficiency, we should probably have multiple versions
* of this function that are specifically for Z16, Z32 and FP Z buffers.
* Try to effectively do that with codegen...
*/
if (sps->surface.format == PIPE_FORMAT_U_Z16)
scale = 65535.0;
else
assert(0); /* XXX fix this someday */
/*
* Convert quad's float depth values to int depth values.
* If the Z buffer stores integer values, we _have_ to do the depth
* compares with integers (not floats). Otherwise, the float->int->float
* conversion of Z values (which isn't an identity function) will cause
* Z-fighting errors.
*/
for (j = 0; j < QUAD_SIZE; j++) {
qzzzz[j] = (GLuint) (quad->outputs.depth[j] * scale);
}
/* get zquad from zbuffer */
sps->read_quad_z(sps, quad->x0, quad->y0, bzzzz);
switch (softpipe->depth_test.func) {
case PIPE_FUNC_NEVER:
/* zmask = 0 */
break;
case PIPE_FUNC_LESS:
/* Note this is pretty much a single sse or cell instruction.
* Like this: quad->mask &= (quad->outputs.depth < zzzz);
*/
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] < bzzzz[j])
zmask |= 1 << j;
}
break;
case PIPE_FUNC_EQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] == bzzzz[j])
zmask |= 1 << j;
}
break;
case PIPE_FUNC_LEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] <= bzzzz[j])
zmask |= (1 << j);
}
break;
case PIPE_FUNC_GREATER:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] > bzzzz[j])
zmask |= (1 << j);
}
break;
case PIPE_FUNC_NOTEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] != bzzzz[j])
zmask |= (1 << j);
}
break;
case PIPE_FUNC_GEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (qzzzz[j] >= bzzzz[j])
zmask |= (1 << j);
}
break;
case PIPE_FUNC_ALWAYS:
zmask = MASK_ALL;
break;
default:
abort();
}
quad->mask &= zmask;
if (softpipe->depth_test.writemask) {
/* This is also efficient with sse / spe instructions:
*/
for (j = 0; j < QUAD_SIZE; j++) {
if (quad->mask & (1 << j)) {
bzzzz[j] = qzzzz[j];
}
}
/* write updated zquad to zbuffer */
sps->write_quad_z(sps, quad->x0, quad->y0, bzzzz);
}
}
static void
depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
{
sp_depth_test_quad(qs, quad);
if (quad->mask)
qs->next->run(qs->next, quad);
}
struct quad_stage *sp_quad_depth_test_stage( struct softpipe_context *softpipe )
{
struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
stage->softpipe = softpipe;
stage->run = depth_test_quad;
return stage;
}
|
