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
|
/*
* Copyright © 2011 Intel Corporation
*
* 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 (including the next
* paragraph) 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
#include "piglit-util-gl.h"
/**
* @file renderbuffer-samples.c
*
* Tests that asking for samples gives the correct number of
* GL_RENDERBUFFER_SAMPLES.
*
* From the EXT_framebuffer_multisample spec:
*
* "If <samples> is zero, then RENDERBUFFER_SAMPLES_EXT is set to
* zero. Otherwise <samples> represents a request for a desired
* minimum number of samples. Since different implementations may
* support different sample counts for multisampled rendering,
* the actual number of samples allocated for the renderbuffer
* image is implementation dependent. However, the resulting
* value for RENDERBUFFER_SAMPLES_EXT is guaranteed to be greater
* than or equal to <samples> and no more than the next larger
* sample count supported by the implementation.
*
* Note also this issue:
*
* " (2) What happens when <samples> is zero or one?
*
* RESOLVED, 0 = single sample, 1 = minimum multisample
*
* Resolved by consensus, May 9, 2005
*
* Zero means single sample, as if RenderbufferStorageEXT
* had been called instead of
* RenderbufferStorageMultisampleEXT. One means minimum
* number of samples supported by implementation.
*
* There was a question if one should mean the same thing as
* single-sample (one sample), or if it should mean the
* minimum supported number of samples for multisample
* rendering. The rules for rasterizing in "multisample"
* mode are different than "non-multisample" mode. In the
* end, we decided that some implementations may wish to
* support a "one-sample" multisample buffer to allow for
* multipass multisampling where the sample location can be
* varied either by the implementation or perhaps explicitly
* by a "multisample location" extension."
*/
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
PIGLIT_GL_TEST_CONFIG_END
enum piglit_result
piglit_display(void)
{
/* UNREACHED */
return PIGLIT_FAIL;
}
void
piglit_init(int argc, char **argv)
{
GLint max_samples, samples, prev_rb_samples = 0;
GLuint rb;
bool pass = true;
piglit_require_extension("GL_EXT_framebuffer_multisample");
glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
glGenRenderbuffersEXT(1, &rb);
glBindRenderbufferEXT(GL_RENDERBUFFER, rb);
printf("%10s %10s\n", "requested", "result");
for (samples = 0; samples <= max_samples; samples++) {
GLint rb_samples;
glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER,
samples,
GL_RGBA,
1, 1);
glGetRenderbufferParameterivEXT(GL_RENDERBUFFER,
GL_RENDERBUFFER_SAMPLES,
&rb_samples);
if ((rb_samples < prev_rb_samples) ||
(samples == 0 && rb_samples != 0) ||
(samples > 0 && rb_samples < samples)) {
fprintf(stderr, "%10d %10d (ERROR)\n", samples, rb_samples);
pass = false;
} else {
printf("%10d %10d\n", samples, rb_samples);
}
prev_rb_samples = rb_samples;
}
glDeleteRenderbuffersEXT(1, &rb);
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
|
