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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
* 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.
*/
/** \file blit-flipped.cpp
*
* From the GL 4.3 spec, section 18.3.1 "Blitting Pixel Rectangles":
*
* If SAMPLE_BUFFERS for either the read framebuffer or draw
* framebuffer is greater than zero, no copy is performed and an
* INVALID_OPERATION error is generated if the dimensions of the
* source and destination rectangles provided to BlitFramebuffer
* are not identical, or if the formats of the read and draw
* framebuffers are not identical.
*
* It is not clear from the spec whether "dimensions" should mean both
* sign and magnitude, or just magnitude. However, Y flips are likely
* to be commonplace in OpenGL applications that have been ported from
* DirectX applications, as a result of the fact that DirectX and
* OpenGL differ in their orientation of the Y axis. Furthermore, at
* least one commercial driver (nVidia) permits Y flips, and L4D2
* relies on them being permitted. So it seems prudent to assume that
* "dimensions" means just magnitude, not sign.
*
* This test verifies that a blit from a multisampled buffer to a
* single-sampled buffer is permitted to flip either in the X or Y
* direction, and that the resulting image is the same as what would
* be obtained by doing a non-flipped blit to a single-sampled buffer,
* and then a second blit that performs a flip.
*/
#include "piglit-test-pattern.h"
#include "piglit-fbo.h"
using namespace piglit_util_fbo;
using namespace piglit_util_test_pattern;
const int pattern_width = 256; const int pattern_height = 256;
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_width = pattern_width*2;
config.window_height = pattern_height;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
PIGLIT_GL_TEST_CONFIG_END
static Fbo multisampled_fbo, singlesampled_fbo;
static TestPattern *test_pattern;
static GLint srcX0, srcY0, srcX1, srcY1;
static void
print_usage_and_exit(char *prog_name)
{
printf("Usage: %s <num_samples> <flip_direction>\n"
" where <flip_direction> is either x or y\n",
prog_name);
piglit_report_result(PIGLIT_FAIL);
}
void
piglit_init(int argc, char **argv)
{
if (argc != 3)
print_usage_and_exit(argv[0]);
/* 1st arg: num_samples */
char *endptr = NULL;
int num_samples = strtol(argv[1], &endptr, 0);
if (endptr != argv[1] + strlen(argv[1]))
print_usage_and_exit(argv[0]);
/* 2nd arg: flip_direction */
if (strcmp(argv[2], "x") == 0) {
srcX0 = pattern_width;
srcX1 = 0;
srcY0 = 0;
srcY1 = pattern_height;
} else if (strcmp(argv[2], "y") == 0) {
srcX0 = 0;
srcX1 = pattern_width;
srcY0 = pattern_height;
srcY1 = 0;
} else {
print_usage_and_exit(argv[0]);
}
piglit_require_gl_version(21);
piglit_require_extension("GL_ARB_framebuffer_object");
piglit_require_extension("GL_ARB_vertex_array_object");
/* 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);
singlesampled_fbo.setup(FboConfig(0,
pattern_width,
pattern_height));
multisampled_fbo.setup(FboConfig(num_samples,
pattern_width,
pattern_height));
test_pattern = new Triangles();
test_pattern->compile();
if (!piglit_check_gl_error(GL_NO_ERROR)) {
piglit_report_result(PIGLIT_FAIL);
}
}
enum piglit_result
piglit_display()
{
bool pass = true;
/* Draw the test pattern into the multisampled buffer. */
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
multisampled_fbo.set_viewport();
test_pattern->draw(TestPattern::no_projection);
/* Blit it to a single-sampled buffer, flipping the
* appropriate coordinate. This will only work if the
* implementation allows multisampled blits to be flipped.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
glBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
0, 0, pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
/* Blit the resulting image to the screen, performing no
* additional flip. This is the test image.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glBlitFramebuffer(0, 0, pattern_width, pattern_height,
0, 0, pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Blit the test pattern into the single-sampled buffer with
* no flip. This should always work.
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
glBlitFramebuffer(0, 0, pattern_width, pattern_height,
0, 0, pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
/* Blit the resulting image to the screen, flipping the
* appropriate coordinate, to produce the reference image.
* This should always work (since it is blitting from
* single-sampled to single-sampled).
*/
glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
glBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
pattern_width, 0, 2*pattern_width, pattern_height,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
/* Compare the test and reference images. */
glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
pass = piglit_probe_rect_halves_equal_rgba(0, 0, 2*pattern_width,
pattern_height) && pass;
piglit_present_results();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
|
