tests/shaders/glsl-vs-sqrt-zero.c

   1 /*
   2  * Copyright © 2009 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 glsl-vs-sqrt-zero.c
  29  *
  30  * Tests that sqrt(0.0) in the VS produces 0.0.
  31  */
  32
  33 #include "piglit-util.h"
  34
  35 int piglit_width = 100, piglit_height = 100;
  36 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  37
  38 static GLint prog;
  39
  40 enum piglit_result
  41 piglit_display(void)
  42 {
  43         GLboolean pass = GL_TRUE;
  44         float color[4] = {0.75, 0.75, 0.75, 0.75};
  45         int x, y;
  46
  47         glClearColor(0.5, 0.5, 0.5, 0.5);
  48         glClear(GL_COLOR_BUFFER_BIT);
  49
  50         piglit_draw_rect(10, 10, 10, 10);
  51
  52         for (x = 10; x < 20; x++) {
  53                 for (y = 10; y < 20; y++) {
  54                         pass &= piglit_probe_pixel_rgb(x, y, color);
  55                 }
  56         }
  57
  58         glutSwapBuffers();
  59
  60         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  61 }
  62
  63 void
  64 piglit_init(int argc, char **argv)
  65 {
  66         GLint vs, fs;
  67
  68         if (!GLEW_VERSION_2_0) {
  69                 printf("Requires OpenGL 2.0\n");
  70                 piglit_report_result(PIGLIT_SKIP);
  71         }
  72
  73         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  74
  75         vs = piglit_compile_shader(GL_VERTEX_SHADER,
  76                                    "shaders/glsl-vs-sqrt-zero.vert");
  77         fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
  78                                    "shaders/glsl-color.frag");
  79
  80         prog = piglit_link_simple_program(vs, fs);
  81
  82         glUseProgram(prog);
  83 }