tests/spec/ext_fog_coord/modes.c

   1 /*
   2  * Copyright © 2010 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 modes.c
  25  *
  26  * Tests that the three fog modes work with fog enabled using EXT_fog_coord.
  27  */
  28
  29 #include "piglit-util-gl.h"
  30
  31 PIGLIT_GL_TEST_CONFIG_BEGIN
  32
  33         config.supports_gl_compat_version = 10;
  34
  35         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  36
  37 PIGLIT_GL_TEST_CONFIG_END
  38
  39 enum piglit_result
  40 piglit_display(void)
  41 {
  42         GLboolean pass = GL_TRUE;
  43         int i, mode;
  44         float near = 0.0, far = 1.0;
  45         GLfloat fogcolor[4] = {1, 1, 1, 1};
  46
  47         glEnable(GL_FOG);
  48         glFogfv(GL_FOG_COLOR, fogcolor);
  49         glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
  50         glColor4f(0, 0, 0, 0.5);
  51
  52         glMatrixMode(GL_PROJECTION);
  53         glLoadIdentity();
  54         glOrtho(0, 1, 0, 1, -near, -far);
  55
  56         for (mode = 0; mode < 3; mode++) {
  57                 float y = mode / 3.0;
  58                 float h = 1.0 / 3.0;
  59
  60                 switch (mode) {
  61                 case 0:
  62                         glFogi(GL_FOG_MODE, GL_LINEAR);
  63                         glFogf(GL_FOG_START, near);
  64                         glFogf(GL_FOG_END, far);
  65                         break;
  66                 case 1:
  67                         glFogi(GL_FOG_MODE, GL_EXP);
  68                         glFogf(GL_FOG_DENSITY, 2);
  69                         break;
  70                 case 2:
  71                         glFogi(GL_FOG_MODE, GL_EXP2);
  72                         glFogf(GL_FOG_DENSITY, 2);
  73                         break;
  74                 }
  75
  76                 for (i = 0; i < 5; i++) {
  77                         float x = i / 5.0;
  78                         float w = 1.0 / 5.0;
  79                         float z = near + (far - near) * i / 5.0;
  80
  81                         glFogCoordfEXT(z);
  82                         piglit_draw_rect(x, y, w, h);
  83                 }
  84         }
  85
  86         for (mode = 0; mode < 3; mode++) {
  87                 float y = (mode + 0.5) / 3.0 * piglit_height;
  88                 for (i = 0; i < 5; i++) {
  89                         float x = (i + 0.5) / 5.0 * piglit_width;
  90                         float z = near + (far - near) * i / 5.0;
  91                         float f;
  92                         float color[4];
  93
  94                         switch (mode) {
  95                         case 0:
  96                                 f = (far - z) / (far - near);
  97                                 break;
  98                         case 1:
  99                                 f = expf(-(2.0 * z));
 100                                 break;
 101                         case 2:
 102                                 f = expf(-(2.0 * z) * (2.0 * z));
 103                                 break;
 104                         }
 105                         if (f > 1.0)
 106                                 f = 1.0;
 107                         if (f < 0.0)
 108                                 f = 0.0;
 109
 110                         color[0] = 1.0 - f;
 111                         color[1] = 1.0 - f;
 112                         color[2] = 1.0 - f;
 113                         color[3] = 0.5;
 114
 115                         pass = pass & piglit_probe_pixel_rgba(x, y, color);
 116                 }
 117         }
 118
 119         piglit_present_results();
 120
 121         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 122 }
 123
 124 void piglit_init(int argc, char**argv)
 125 {
 126         piglit_require_extension("GL_EXT_fog_coord");
 127 }