tests/shaders/glsl-fs-fogcolor-statechange.c

   1 /*
   2  * Copyright © 2011 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
  24 /** @file glsl-fs-fogcolor-statechange.c
  25  *
  26  * Tests that changing just gl_Fog.color is reflected in program
  27  * execution.
  28  */
  29
  30 #include "piglit-util-gl.h"
  31
  32 PIGLIT_GL_TEST_CONFIG_BEGIN
  33
  34         config.supports_gl_compat_version = 10;
  35
  36         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  37
  38 PIGLIT_GL_TEST_CONFIG_END
  39
  40 enum piglit_result
  41 piglit_display(void)
  42 {
  43         GLboolean pass = GL_TRUE;
  44         static const float green[] = {0.0, 1.0, 0.0, 0.0};
  45         static const float blue[] = {0.0, 0.0, 1.0, 0.0};
  46
  47         glClearColor(1.0, 0.0, 0.0, 0.0);
  48         glClear(GL_COLOR_BUFFER_BIT);
  49
  50         glFogfv(GL_FOG_COLOR, green);
  51         piglit_draw_rect(-1, -1, 1, 2);
  52
  53         glFogfv(GL_FOG_COLOR, blue);
  54         piglit_draw_rect(0, -1, 1, 2);
  55
  56         pass &= piglit_probe_rect_rgba(0, 0,
  57                                        piglit_width / 2, piglit_height,
  58                                        green);
  59         pass &= piglit_probe_rect_rgba(piglit_width / 2, 0,
  60                                        piglit_width / 2, piglit_height,
  61                                        blue);
  62
  63         piglit_present_results();
  64
  65         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  66 }
  67
  68 void
  69 piglit_init(int argc, char **argv)
  70 {
  71         GLint vs, fs, prog;
  72         const char *fs_source =
  73                 "void main()\n"
  74                 "{\n"
  75                 "       gl_FragColor = gl_Fog.color;\n"
  76                 "}\n";
  77
  78         piglit_require_gl_version(20);
  79
  80         vs = piglit_compile_shader(GL_VERTEX_SHADER,
  81                                    "shaders/glsl-mvp.vert");
  82         fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);
  83
  84         prog = piglit_link_simple_program(vs, fs);
  85
  86         glUseProgram(prog);
  87 }