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-gl.h"
  34
  35 PIGLIT_GL_TEST_CONFIG_BEGIN
  36
  37         config.supports_gl_compat_version = 10;
  38
  39         config.window_width = 256;
  40         config.window_height = 256;
  41         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  42
  43 PIGLIT_GL_TEST_CONFIG_END
  44
  45 static GLint prog;
  46
  47 enum piglit_result
  48 piglit_display(void)
  49 {
  50         GLboolean pass = GL_TRUE;
  51         int x, y;
  52
  53         glClearColor(0.5, 0.5, 0.5, 0.5);
  54         glClear(GL_COLOR_BUFFER_BIT);
  55
  56         piglit_draw_rect(0, 0, piglit_width, piglit_height);
  57
  58         for (y = 8; y < piglit_height && pass; y += 16) {
  59                 for (x = 8; x < piglit_width; x += 16) {
  60                         float color[3];
  61
  62                         color[0] = x / 256.0;
  63                         color[1] = y / 256.0;
  64                         color[2] = 0;
  65
  66                         pass &= piglit_probe_pixel_rgb(x, y, color);
  67                         if (!pass)
  68                                 break;
  69                 }
  70         }
  71
  72         piglit_present_results();
  73
  74         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  75 }
  76
  77 void
  78 piglit_init(int argc, char **argv)
  79 {
  80         GLint vs, fs;
  81
  82         piglit_require_gl_version(20);
  83
  84         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  85
  86         vs = piglit_compile_shader(GL_VERTEX_SHADER,
  87                                    "shaders/glsl-mvp.vert");
  88         fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
  89                                    "shaders/glsl-fs-fragcoord.frag");
  90
  91         prog = piglit_link_simple_program(vs, fs);
  92
  93         glUseProgram(prog);
  94 }