tests/shaders/glsl-sin.c

   1 /*
   2  * Copyright © 2009 Marek Olšák (maraeo@gmail.com)
   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  *    Marek Olšák <mareao@gmail.com>
  25  *
  26  */
  27
  28 /** @file glsl-sin.c
  29  *
  30  * Tests "sin" in both vertex and fragment shaders
  31  */
  32
  33 #include "piglit-util-gl.h"
  34
  35 PIGLIT_GL_TEST_CONFIG_BEGIN
  36
  37         config.supports_gl_compat_version = 10;
  38
  39         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  40
  41 PIGLIT_GL_TEST_CONFIG_END
  42
  43 static char vs_code[] =
  44     "uniform float a;\n"
  45     "varying float val;\n"
  46
  47     "void main()\n"
  48     "{\n"
  49     "    gl_Position = ftransform();\n"
  50     "    val = sin(a);\n"
  51     "}\n";
  52
  53 static char fs_code[] =
  54     "uniform float a;\n"
  55     "varying float val;\n"
  56
  57     "void main()\n"
  58     "{\n"
  59     "    gl_FragColor = vec4(val, sin(a), -1.0, 1.0) * 0.5 + 0.5;\n"
  60     "}\n";
  61
  62 static GLuint setup_shaders()
  63 {
  64     GLuint vs, fs, prog;
  65
  66     vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_code);
  67     fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_code);
  68     prog = piglit_link_simple_program(vs, fs);
  69
  70     glUseProgram(prog);
  71     return prog;
  72 }
  73
  74 static GLboolean test()
  75 {
  76     GLint prog, location;
  77     GLboolean pass = GL_TRUE;
  78     int i;
  79     float color[4] = {0, 0, 0, 1};
  80     float DEGREES_30 = 0.523598776;
  81
  82     prog = setup_shaders();
  83     location = glGetUniformLocation(prog, "a");
  84
  85     for (i = 0; i <= 50; i++) {
  86         glUniform1f(location, (i - 25) * DEGREES_30);
  87         piglit_draw_rect((i % 10) * 10, (i / 10) * 10, 10, 10);
  88     }
  89     if (!piglit_check_gl_error(GL_NO_ERROR))
  90              piglit_report_result(PIGLIT_FAIL);
  91
  92     for (i = 0; i <= 50; i++) {
  93         color[0] = color[1] = sin((i - 25) * DEGREES_30) * 0.5 + 0.5;
  94         pass = piglit_probe_pixel_rgb((i % 10) * 10 + 5, (i / 10) * 10 + 5, color) && pass;
  95     }
  96
  97     return pass;
  98 }
  99
 100 enum piglit_result piglit_display(void)
 101 {
 102     GLboolean pass;
 103
 104     piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 105
 106     glClearColor(0.5, 0.5, 0.5, 0.5);
 107     glClear(GL_COLOR_BUFFER_BIT);
 108
 109     pass = test();
 110
 111     piglit_present_results();
 112
 113     return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 114 }
 115
 116 void piglit_init(int argc, char **argv)
 117 {
 118         piglit_require_gl_version(20);
 119 }
 120