1 /*
2 * Copyright © 2012 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23 #include "piglit-test-pattern.h"
24 #include "piglit-fbo.h"
25 using namespace piglit_util_fbo;
26 using namespace piglit_util_test_pattern;
27
28 /**
29 * \file unaligned-blit.cpp
30 *
31 * Verify the accuracy of blits involving MSAA buffers when the blit
32 * coordinates are not aligned to simple powers of two.
33 *
34 * This test operates through the use of a sequence of blits that
35 * might be called a "scrambling blit": a source image (whose size is
36 * not a power of two) is divided up into tiles (whose size is also
37 * not a power of two), and these tiles are blitted one at a time from
38 * the source to the destination buffer, permuting the order of the
39 * tiles in a deterministic way. The scrambling ensures that we test
40 * a wide variety of different offsets and coordinate misalignments.
41 *
42 * The test performs the following operations: First an unscrambled
43 * test image is created in a source buffer, which may or may not be
44 * multisampled. Then a scrambling blit is used to copy it to a
45 * destination buffer, which also may or may not be multisampled.
46 * Finally, the destination buffer is blitted to the window system
47 * framebuffer, using the inverse permutation. This should result in
48 * an unscrambled test image.
49 *
50 * To verify that the test image is correct, we produce a reference
51 * image by repeating the same operation using ordinary unscrambled
52 * blits.
53 */
54 const int pattern_size = 245;
55 const int tile_size = 49;
56 const int tiles_across = 5;
57 const int num_tiles = tiles_across * tiles_across;
58
59 PIGLIT_GL_TEST_CONFIG_BEGIN
60
61 config.supports_gl_compat_version = 10;
62
63 config.window_width = 2*pattern_size;
64 config.window_height = pattern_size;
65 config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
66 config.khr_no_error_support = PIGLIT_NO_ERRORS;
67
68 PIGLIT_GL_TEST_CONFIG_END
69
70 const int permutation[num_tiles] = {
71 10, 5, 6, 17, 3, 11, 16, 21, 14, 24, 23, 8, 15, 18, 0, 12, 9,
72 4, 22, 19, 20, 2, 7, 13, 1
73 };
74
75 const int inverse_permutation[num_tiles] = {
76 14, 24, 21, 4, 17, 1, 2, 22, 11, 16, 0, 5, 15, 23, 8, 12, 6,
77 3, 13, 19, 20, 7, 18, 10, 9
78 };
79
80 Fbo src_fbo;
81 Fbo dst_fbo;
82 TestPattern *test_pattern = NULL;
83 ManifestProgram *manifest_program = NULL;
84 GLbitfield buffer_to_test;
85
86 void
scrambling_blit(const int * permutation)87 scrambling_blit(const int *permutation)
88 {
89 for (int i = 0; i < num_tiles; ++i) {
90 int src_x = (i % tiles_across) * tile_size;
91 int src_y = (i / tiles_across) * tile_size;
92 int dst_x = (permutation[i] % tiles_across) * tile_size;
93 int dst_y = (permutation[i] / tiles_across) * tile_size;
94 glBlitFramebuffer(src_x, src_y,
95 src_x + tile_size, src_y + tile_size,
96 dst_x, dst_y,
97 dst_x + tile_size, dst_y + tile_size,
98 buffer_to_test, GL_NEAREST);
99 }
100 }
101
102 void
print_usage_and_exit(char * prog_name)103 NORETURN print_usage_and_exit(char *prog_name)
104 {
105 printf("Usage: %s <num_samples> <buffer_type> <blit_type>\n"
106 " where <buffer_type> is one of:\n"
107 " color\n"
108 " stencil\n"
109 " depth\n"
110 " and <blit_type> is one of:\n"
111 " msaa\n"
112 " upsample\n"
113 " downsample\n",
114 prog_name);
115 piglit_report_result(PIGLIT_FAIL);
116 }
117
118 void
piglit_init(int argc,char ** argv)119 piglit_init(int argc, char **argv)
120 {
121 int num_samples;
122 int src_samples;
123 int dst_samples;
124 if (argc < 4)
125 print_usage_and_exit(argv[0]);
126
127 char *endptr = NULL;
128 num_samples = strtol(argv[1], &endptr, 0);
129 if (endptr != argv[1] + strlen(argv[1]))
130 print_usage_and_exit(argv[0]);
131
132 piglit_require_gl_version(21);
133 piglit_require_extension("GL_ARB_framebuffer_object");
134 piglit_require_extension("GL_ARB_vertex_array_object");
135
136 /* Skip the test if num_samples > GL_MAX_SAMPLES */
137 GLint max_samples;
138 glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
139 if (num_samples > max_samples)
140 piglit_report_result(PIGLIT_SKIP);
141
142 if (strcmp(argv[2], "color") == 0) {
143 test_pattern = new Triangles();
144 buffer_to_test = GL_COLOR_BUFFER_BIT;
145 } else if (strcmp(argv[2], "depth") == 0) {
146 test_pattern = new DepthSunburst();
147 manifest_program = new ManifestDepth();
148 buffer_to_test = GL_DEPTH_BUFFER_BIT;
149 } else if (strcmp(argv[2], "stencil") == 0) {
150 test_pattern = new StencilSunburst();
151 manifest_program = new ManifestStencil();
152 buffer_to_test = GL_STENCIL_BUFFER_BIT;
153 } else {
154 print_usage_and_exit(argv[0]);
155 }
156
157 if (strcmp(argv[3], "msaa") == 0) {
158 src_samples = dst_samples = num_samples;
159 } else if (strcmp(argv[3], "upsample") == 0) {
160 src_samples = 0;
161 dst_samples = num_samples;
162 } else if (strcmp(argv[3], "downsample") == 0) {
163 src_samples = num_samples;
164 dst_samples = 0;
165 } else {
166 print_usage_and_exit(argv[0]);
167 }
168
169 test_pattern->compile();
170 if (manifest_program)
171 manifest_program->compile();
172 src_fbo.setup(FboConfig(src_samples, pattern_size, pattern_size));
173 dst_fbo.setup(FboConfig(dst_samples, pattern_size, pattern_size));
174 }
175
176 enum piglit_result
piglit_display()177 piglit_display()
178 {
179 bool pass = true;
180
181 /* Draw the test pattern in src_fbo. */
182 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, src_fbo.handle);
183 src_fbo.set_viewport();
184 test_pattern->draw(TestPattern::no_projection);
185
186 /* Blit from src_fbo to dst_fbo, scrambling the pattern as we go. */
187 glBindFramebuffer(GL_READ_FRAMEBUFFER, src_fbo.handle);
188 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst_fbo.handle);
189 scrambling_blit(permutation);
190
191 /* Blit from dst_fbo to the left half of the window system
192 * framebuffer, unscrambling as we go.
193 */
194 glBindFramebuffer(GL_READ_FRAMEBUFFER, dst_fbo.handle);
195 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
196 scrambling_blit(inverse_permutation);
197
198 /* Blit from src_fbo to dst_fbo with no scrambling. */
199 glBindFramebuffer(GL_READ_FRAMEBUFFER, src_fbo.handle);
200 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst_fbo.handle);
201 glBlitFramebuffer(0, 0, pattern_size, pattern_size,
202 0, 0, pattern_size, pattern_size,
203 buffer_to_test, GL_NEAREST);
204
205 /* Blit from dst_fbo to the right half of the window system
206 * framebuffer, with no scrambling.
207 */
208 glBindFramebuffer(GL_READ_FRAMEBUFFER, dst_fbo.handle);
209 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
210 glBlitFramebuffer(0, 0, pattern_size, pattern_size,
211 pattern_size, 0, pattern_size*2, pattern_size,
212 buffer_to_test, GL_NEAREST);
213
214 /* If we were testing depth or stencil, manifest the image so
215 * that we can see it.
216 */
217 glViewport(0, 0, piglit_width, piglit_height);
218 if (manifest_program)
219 manifest_program->run();
220
221 /* Check that the left and right halves of the screen match. */
222 glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
223 pass = piglit_probe_rect_halves_equal_rgba(0, 0, piglit_width,
224 piglit_height) && pass;
225
226 pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
227
228 piglit_present_results();
229
230 return pass ? PIGLIT_PASS : PIGLIT_FAIL;
231 }
232