1 /*
2 * Copyright © 2010 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 * Authors:
24 * Eric Anholt <eric@anholt.net>
25 *
26 */
27
28 /** @file fbo-readpixels-small.c
29 *
30 * Tests that PBO blit readpixels on a 2x2 FBO works correctly. Based
31 * on a description of a failure in clutter and figuring out the associated
32 * bug.
33 *
34 * https://bugs.freedesktop.org/show_bug.cgi?id=25921
35 */
36
37 #include "piglit-util-gl.h"
38
39 #define BUF_WIDTH 8
40 #define BUF_HEIGHT 8
41
42 PIGLIT_GL_TEST_CONFIG_BEGIN
43
44 config.supports_gl_compat_version = 10;
45
46 config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
47 config.khr_no_error_support = PIGLIT_NO_ERRORS;
48
49 PIGLIT_GL_TEST_CONFIG_END
50
51 static void
make_fbo(GLuint * fbo,GLuint * tex)52 make_fbo(GLuint *fbo, GLuint *tex)
53 {
54 GLenum status;
55
56 glGenTextures(1, tex);
57 glBindTexture(GL_TEXTURE_2D, *tex);
58 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
59 2, 2, 0,
60 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
61
62 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
63 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
64
65 glGenFramebuffersEXT(1, fbo);
66 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, *fbo);
67 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
68 GL_COLOR_ATTACHMENT0_EXT,
69 GL_TEXTURE_2D,
70 *tex,
71 0);
72 if (!piglit_check_gl_error(GL_NO_ERROR))
73 piglit_report_result(PIGLIT_FAIL);
74
75 status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
76 if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
77 fprintf(stderr, "framebuffer incomplete (status = 0x%04x)\n",
78 status);
79 abort();
80 }
81 }
82
83 static GLboolean
probe(int x,int y,uint8_t * expected,uint8_t * observed)84 probe(int x, int y, uint8_t *expected, uint8_t *observed)
85 {
86 if (expected[0] != observed[0] ||
87 expected[1] != observed[1] ||
88 expected[2] != observed[2]) {
89 printf("Probe color at (%i,%i)\n", x, y);
90 printf(" Expected: b = 0x%02x g = 0x%02x r = 0x%02x a = 0x%02x\n",
91 expected[0], expected[1], expected[2], expected[3]);
92 printf(" Observed: b = 0x%02x g = 0x%02x r = 0x%02x a = 0x%02x\n",
93 observed[0], observed[1], observed[2], observed[3]);
94
95 return GL_FALSE;
96 } else {
97 return GL_TRUE;
98 }
99 }
100
101 enum piglit_result
piglit_display(void)102 piglit_display(void)
103 {
104 GLboolean pass = GL_TRUE;
105 GLuint fbo, tex, pbo;
106 uint8_t *addr;
107 static uint8_t green[] = {0x00, 0xFF, 0x00, 0x00};
108 static uint8_t blue[] = {0xFF, 0x00, 0x00, 0x00};
109
110 make_fbo(&fbo, &tex);
111
112 glClear(GL_COLOR_BUFFER_BIT);
113
114 glGenBuffersARB(1, &pbo);
115 glBindBufferARB(GL_PIXEL_PACK_BUFFER, pbo);
116 glBufferDataARB(GL_PIXEL_PACK_BUFFER, 4 * 4, NULL, GL_STREAM_DRAW_ARB);
117 glPixelStorei(GL_PACK_ALIGNMENT, 1);
118
119 glViewport(0, 0, 2, 2);
120 piglit_ortho_projection(2, 2, GL_FALSE);
121
122 /* bottom: green. top: blue. */
123 glColor4f(0.0, 1.0, 0.0, 0.0);
124 piglit_draw_rect(0, 0, 2, 1);
125 glColor4f(0.0, 0.0, 1.0, 0.0);
126 piglit_draw_rect(0, 1, 2, 1);
127
128 /* Read the whole buffer. */
129 glReadPixels(0, 0, 2, 2,
130 GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)0);
131 addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
132
133 pass &= probe(0, 0, green, addr);
134 pass &= probe(1, 0, green, addr + 4);
135 pass &= probe(0, 1, blue, addr + 8);
136 pass &= probe(1, 1, blue, addr + 12);
137 glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
138
139 /* Read with an offset. */
140 glReadPixels(1, 0, 1, 1,
141 GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4);
142 addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
143 pass &= probe(1, 0, green, addr + 4);
144 glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
145
146 /* Read with an offset. */
147 glReadPixels(1, 1, 1, 1,
148 GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4);
149 addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB);
150 pass &= probe(1, 1, blue, addr + 4);
151 glUnmapBufferARB(GL_PIXEL_PACK_BUFFER);
152
153 glDeleteBuffersARB(1, &pbo);
154
155 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
156
157 glViewport(0, 0, piglit_width, piglit_height);
158 piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
159
160 glBindTexture(GL_TEXTURE_2D, tex);
161 glEnable(GL_TEXTURE_2D);
162 glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
163
164 piglit_draw_rect_tex(0, 0, piglit_width, piglit_height,
165 0, 0, 1, 1);
166 glDisable(GL_TEXTURE_2D);
167
168 glDeleteFramebuffersEXT(1, &fbo);
169 glDeleteTextures(1, &tex);
170
171 piglit_present_results();
172
173 return pass ? PIGLIT_PASS : PIGLIT_FAIL;
174 }
175
piglit_init(int argc,char ** argv)176 void piglit_init(int argc, char **argv)
177 {
178 piglit_require_extension("GL_EXT_framebuffer_object");
179 piglit_require_extension("GL_ARB_pixel_buffer_object");
180
181 glDisable(GL_DITHER);
182 }
183