1 /*
2 * Copyright © 2011 Marek Olšák
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 */
24
25 /** @file blending-in-shader.c
26 *
27 * Test programmable blending with GL_NV_texture_barrier.
28 */
29
30 #include "piglit-util-gl.h"
31
32 PIGLIT_GL_TEST_CONFIG_BEGIN
33
34 config.supports_gl_compat_version = 10;
35 config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
36
37 PIGLIT_GL_TEST_CONFIG_END
38
39 static GLuint tex, fbo, prog, texloc;
40 static float tex_data[16*16*4], res_data[16*16*4];
41
42 static const char *fstext = {
43 "uniform sampler2D fb;"
44 "void main() {"
45 " gl_FragColor = sqrt(texture2D(fb, gl_FragCoord.xy / 16.0));"
46 "}"
47 };
48
49 #define PASSES 3
50
piglit_display(void)51 enum piglit_result piglit_display(void)
52 {
53 GLboolean pass = GL_TRUE;
54 int i;
55
56 glBindTexture(GL_TEXTURE_2D, tex);
57 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 16, 16, 0, GL_RGBA, GL_FLOAT, tex_data);
58 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
59 glViewport(0, 0, 16, 16);
60
61 glUseProgram(prog);
62 glUniform1i(texloc, 0);
63
64 for (i = 0; i < PASSES; i++) {
65 if (i != 0)
66 glTextureBarrierNV();
67 piglit_draw_rect_tex(-1, -1, 2, 2, 0, 0, 1, 1);
68 }
69
70 pass = piglit_probe_image_rgba(0, 0, 16, 16, res_data);
71
72 glUseProgram(0);
73 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
74 glViewport(0, 0, piglit_width, piglit_height);
75
76 piglit_draw_rect_tex(-1, -1, 2, 2, 0, 0, 1, 1);
77
78 piglit_present_results();
79
80 return pass ? PIGLIT_PASS : PIGLIT_FAIL;
81 }
82
piglit_init(int argc,char ** argv)83 void piglit_init(int argc, char **argv)
84 {
85 unsigned int i, j;
86
87 piglit_require_extension("GL_EXT_framebuffer_object");
88 piglit_require_extension("GL_NV_texture_barrier");
89 piglit_require_GLSL();
90
91 srand(0);
92 for (i = 0; i < 16 * 16 * 4; ++i) {
93 tex_data[i] = (rand() % 256) / 255.f;
94 res_data[i] = tex_data[i];
95 for (j = 0; j < PASSES; j++)
96 res_data[i] = sqrt(res_data[i]);
97 }
98
99 glEnable(GL_TEXTURE_2D);
100 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
101
102 glGenTextures(1, &tex);
103 glBindTexture(GL_TEXTURE_2D, tex);
104 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
105 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
106 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
107 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
108 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 16, 16, 0, GL_RGBA, GL_FLOAT, NULL);
109
110 glGenFramebuffersEXT(1, &fbo);
111 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
112 glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0);
113 assert(glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) == GL_FRAMEBUFFER_COMPLETE_EXT);
114
115 prog = piglit_build_simple_program(NULL, fstext);
116
117 texloc = glGetUniformLocation(prog, "fb");
118 }
119