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
168
169
|
/*
* Copyright © 2012 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 "common.h"
/**
* \file line-smooth.cpp
*
* Page 128 (in the PDF) of the OpenGL 3.0 spec says:
* "If MULTISAMPLE is enabled, and the value of SAMPLE BUFFERS is one,
* then lines are rasterized using the following algorithm, regardless
* of whether line antialias-ing (LINE_SMOOTH) is enabled or disabled".
* This test operates by drawing a test pattern with GL_LINE_SMOOTH
* disabled. Blit it in to right half of window system framebuffer.
* This is our reference image.
*
* Draw the same test pattern second time with GL_LINE_SMOOTH enabled
* in a multisample buffer. Blit it in to left half of window system
* framebuffer. This is our test image.
*
* To verify that GL_LINE_SMOOTH don't affect MSAA, compare the two
* halves of default framebuffer. They are expected to match.
*
*/
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = 512;
config.window_height = 256;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_ALPHA | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
PIGLIT_GL_TEST_CONFIG_END
const int pattern_width = 256; const int pattern_height = 256;
Fbo test_fbo;
TestPattern *test_pattern = NULL;
GLbitfield buffer_to_test;
void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples>\n",
prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
int num_samples;
if (argc < 2)
print_usage_and_exit(argv[0]);
{
char *endptr = NULL;
num_samples = strtol(argv[1], &endptr, 0);
if (endptr != argv[1] + strlen(argv[1]))
print_usage_and_exit(argv[0]);
}
piglit_require_gl_version(30);
glClear(GL_COLOR_BUFFER_BIT);
/* Skip the test if num_samples > GL_MAX_SAMPLES */
GLint max_samples;
glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
if (num_samples > max_samples)
piglit_report_result(PIGLIT_SKIP);
buffer_to_test = GL_COLOR_BUFFER_BIT;
test_pattern = new Lines();
test_pattern->compile();
test_fbo.setup(FboConfig(num_samples, pattern_width, pattern_height));
glEnable (GL_BLEND);
glBlendFunc (GL_SRC_ALPHA_SATURATE, GL_ONE);
}
enum piglit_result
piglit_display()
{
bool pass = true;
float proj[4][4] = {
{ 1, 0, 0, 0 },
{ 0, 1, 0, 0 },
{ 0, 0, 1, 0 },
{ 0, 0, 0, 1 } };
/* Draw test pattern in multisample test_fbo with GL_LINE_SMOOTH
* disabled.
*/
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, test_fbo.handle);
glClear(buffer_to_test);
test_fbo.set_viewport();
test_pattern->draw(proj);
/* Blit test_fbo to the right half of window system framebuffer.
* This is the reference image.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, test_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, pattern_width, pattern_height,
pattern_width, 0, 2*pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Draw test pattern in mulisample test_fbo with GL_LINE_SMOOTH
* enabled
*/
glEnable(GL_LINE_SMOOTH);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
/* Disable depth test to correctly render overlapping smooth
* primitives. Otherwise we have to render the primitives in
* back to front order
*/
glDisable (GL_DEPTH_TEST);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, test_fbo.handle);
test_fbo.set_viewport();
test_pattern->draw(proj);
glDisable(GL_LINE_SMOOTH);
/* Now blit test_fbo to the left half of window system framebuffer.
* This is the test image.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, test_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, pattern_width, pattern_height,
0, 0, pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Check that the left and right halves of the screen match. If they
* don't, then GL_LINE_SMOOTH is not ignored with multisample
* rendering.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
pass = piglit_probe_rect_halves_equal_rgba(0, 0, piglit_width,
piglit_height) && pass;
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
|
