tests/shaders/glsl-fs-fragcoord.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-fs-fragcoord.c
  29  *
  30  * Tests that gl_FragCoord produces the expected output in a fragment shader.
  31  */
  32
  33 #include "piglit-util.h"
  34
  35 int piglit_width = 256, piglit_height = 256;
  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         int x, y;
  45
  46         glClearColor(0.5, 0.5, 0.5, 0.5);
  47         glClear(GL_COLOR_BUFFER_BIT);
  48
  49         piglit_draw_rect(0, 0, piglit_width, piglit_height);
  50
  51         for (y = 0; y < piglit_height; y++) {
  52                 for (x = 0; x < piglit_width; x++) {
  53                         float color[3];
  54
  55                         color[0] = x / 256.0;
  56                         color[1] = y / 256.0;
  57                         color[2] = 0;
  58
  59                         pass &= piglit_probe_pixel_rgb(x, y, color);
  60                         if (!pass)
  61                                 break;
  62                 }
  63         }
  64
  65         glutSwapBuffers();
  66
  67         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  68 }
  69
  70 void
  71 piglit_init(int argc, char **argv)
  72 {
  73         GLint vs, fs;
  74
  75         if (!GLEW_VERSION_2_0) {
  76                 printf("Requires OpenGL 2.0\n");
  77                 piglit_report_result(PIGLIT_SKIP);
  78         }
  79
  80         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  81
  82         vs = piglit_compile_shader(GL_VERTEX_SHADER,
  83                                    "shaders/glsl-mvp.vert");
  84         fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
  85                                    "shaders/glsl-fs-fragcoord.frag");
  86
  87         prog = piglit_link_simple_program(vs, fs);
  88
  89         glUseProgram(prog);
  90 }