tests/general/fog-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 fog-modes.c
  25  *
  26  * Tests that the three fog modes work with fog enabled using the depth value.
  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 zNear = 0.0, zFar = 1.0;
  45         GLfloat fogcolor[4] = {1, 1, 1, 1};
  46
  47         glEnable(GL_FOG);
  48         glFogfv(GL_FOG_COLOR, fogcolor);
  49         glColor4f(0, 0, 0, 0.5);
  50
  51         glMatrixMode(GL_PROJECTION);
  52         glLoadIdentity();
  53         glOrtho(0, 1, 0, 1, -zNear, -zFar);
  54
  55         for (mode = 0; mode < 3; mode++) {
  56                 float y = mode / 3.0;
  57                 float h = 1.0 / 3.0;
  58
  59                 switch (mode) {
  60                 case 0:
  61                         glFogi(GL_FOG_MODE, GL_LINEAR);
  62                         glFogf(GL_FOG_START, zNear);
  63                         glFogf(GL_FOG_END, zFar);
  64                         break;
  65                 case 1:
  66                         glFogi(GL_FOG_MODE, GL_EXP);
  67                         glFogf(GL_FOG_DENSITY, 2);
  68                         break;
  69                 case 2:
  70                         glFogi(GL_FOG_MODE, GL_EXP2);
  71                         glFogf(GL_FOG_DENSITY, 2);
  72                         break;
  73                 }
  74
  75                 for (i = 0; i < 5; i++) {
  76                         float x = i / 5.0;
  77                         float w = 1.0 / 5.0;
  78                         float z = zNear + (zFar - zNear) * i / 5.0;
  79
  80                         piglit_draw_rect_z(z, x, y, w, h);
  81                 }
  82         }
  83
  84         for (mode = 0; mode < 3; mode++) {
  85                 float y = (mode + 0.5) / 3.0 * piglit_height;
  86                 for (i = 0; i < 5; i++) {
  87                         float x = (i + 0.5) / 5.0 * piglit_width;
  88                         float z = zNear + (zFar - zNear) * i / 5.0;
  89                         float f;
  90                         float color[4];
  91
  92                         switch (mode) {
  93                         case 0:
  94                                 f = (zFar - z) / (zFar - zNear);
  95                                 break;
  96                         case 1:
  97                                 f = expf(-(2.0 * z));
  98                                 break;
  99                         case 2:
 100                                 f = expf(-(2.0 * z) * (2.0 * z));
 101                                 break;
 102                         }
 103                         if (f > 1.0)
 104                                 f = 1.0;
 105                         if (f < 0.0)
 106                                 f = 0.0;
 107
 108                         color[0] = 1.0 - f;
 109                         color[1] = 1.0 - f;
 110                         color[2] = 1.0 - f;
 111                         color[3] = 0.5;
 112
 113                         pass = pass & piglit_probe_pixel_rgba(x, y, color);
 114                 }
 115         }
 116
 117         piglit_present_results();
 118
 119         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 120 }
 121
 122 void piglit_init(int argc, char**argv)
 123 {
 124 }