Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 1 | /* |
Brian Paul | 8fa5075 | 2003-06-13 02:42:57 +0000 | [diff] [blame] | 2 | * GL_ARB_occlusion_query demo |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 3 | * |
| 4 | * Brian Paul |
| 5 | * 12 June 2003 |
| 6 | * |
| 7 | * Copyright (C) 2003 Brian Paul All Rights Reserved. |
| 8 | * |
| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 10 | * copy of this software and associated documentation files (the "Software"), |
| 11 | * to deal in the Software without restriction, including without limitation |
| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
| 14 | * Software is furnished to do so, subject to the following conditions: |
| 15 | * |
| 16 | * The above copyright notice and this permission notice shall be included |
| 17 | * in all copies or substantial portions of the Software. |
| 18 | * |
| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 25 | */ |
| 26 | |
| 27 | #include <assert.h> |
| 28 | #include <stdio.h> |
| 29 | #include <stdlib.h> |
| 30 | #include <string.h> |
| 31 | #include <math.h> |
José Fonseca | 2e61d13 | 2009-01-24 16:39:49 +0000 | [diff] [blame] | 32 | #include <GL/glew.h> |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 33 | #include <GL/glut.h> |
| 34 | |
Brian Paul | dbe1eca | 2004-06-28 22:03:44 +0000 | [diff] [blame] | 35 | #define TEST_DISPLAY_LISTS 0 |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 36 | |
Brian Paul | 8fa5075 | 2003-06-13 02:42:57 +0000 | [diff] [blame] | 37 | static GLboolean Anim = GL_TRUE; |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 38 | static GLfloat Xpos = 0; |
| 39 | static GLuint OccQuery; |
Brian Paul | 6c14bdc | 2008-12-18 09:48:20 -0700 | [diff] [blame] | 40 | static GLint Win = 0; |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 41 | |
| 42 | |
| 43 | static void |
| 44 | PrintString(const char *s) |
| 45 | { |
| 46 | while (*s) { |
| 47 | glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s); |
| 48 | s++; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | |
| 53 | |
| 54 | static void Idle(void) |
| 55 | { |
| 56 | static int lastTime = 0; |
| 57 | static int sign = +1; |
| 58 | int time = glutGet(GLUT_ELAPSED_TIME); |
| 59 | float step; |
| 60 | |
| 61 | if (lastTime == 0) |
| 62 | lastTime = time; |
| 63 | else if (time - lastTime < 20) /* 50Hz update */ |
| 64 | return; |
| 65 | |
| 66 | step = (time - lastTime) / 1000.0 * sign; |
| 67 | lastTime = time; |
| 68 | |
| 69 | Xpos += step; |
| 70 | |
| 71 | if (Xpos > 2.5) { |
| 72 | Xpos = 2.5; |
| 73 | sign = -1; |
| 74 | } |
| 75 | else if (Xpos < -2.5) { |
| 76 | Xpos = -2.5; |
| 77 | sign = +1; |
| 78 | } |
| 79 | glutPostRedisplay(); |
| 80 | } |
| 81 | |
| 82 | |
| 83 | static void Display( void ) |
| 84 | { |
| 85 | GLuint passed; |
| 86 | GLint ready; |
| 87 | char s[100]; |
| 88 | |
| 89 | glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); |
| 90 | |
| 91 | glMatrixMode( GL_PROJECTION ); |
| 92 | glLoadIdentity(); |
| 93 | glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 ); |
| 94 | glMatrixMode( GL_MODELVIEW ); |
| 95 | glLoadIdentity(); |
| 96 | glTranslatef( 0.0, 0.0, -15.0 ); |
| 97 | |
| 98 | /* draw the occluding polygons */ |
| 99 | glColor3f(0, 0.6, 0.8); |
| 100 | glBegin(GL_QUADS); |
| 101 | glVertex2f(-1.6, -1.5); |
| 102 | glVertex2f(-0.4, -1.5); |
| 103 | glVertex2f(-0.4, 1.5); |
| 104 | glVertex2f(-1.6, 1.5); |
| 105 | |
| 106 | glVertex2f( 0.4, -1.5); |
| 107 | glVertex2f( 1.6, -1.5); |
| 108 | glVertex2f( 1.6, 1.5); |
| 109 | glVertex2f( 0.4, 1.5); |
| 110 | glEnd(); |
| 111 | |
| 112 | /* draw the test polygon with occlusion testing */ |
| 113 | glPushMatrix(); |
| 114 | glTranslatef(Xpos, 0, -0.5); |
| 115 | glScalef(0.3, 0.3, 1.0); |
| 116 | glRotatef(-90.0 * Xpos, 0, 0, 1); |
| 117 | |
Brian Paul | b58091a | 2005-01-09 17:00:57 +0000 | [diff] [blame] | 118 | #if defined(GL_ARB_occlusion_query) |
Brian Paul | dbe1eca | 2004-06-28 22:03:44 +0000 | [diff] [blame] | 119 | #if TEST_DISPLAY_LISTS |
| 120 | glNewList(10, GL_COMPILE); |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 121 | glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery); |
Brian Paul | dbe1eca | 2004-06-28 22:03:44 +0000 | [diff] [blame] | 122 | glEndList(); |
| 123 | glCallList(10); |
| 124 | #else |
| 125 | glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery); |
| 126 | #endif |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 127 | |
| 128 | glColorMask(0, 0, 0, 0); |
| 129 | glDepthMask(GL_FALSE); |
| 130 | |
| 131 | glBegin(GL_POLYGON); |
| 132 | glVertex3f(-1, -1, 0); |
| 133 | glVertex3f( 1, -1, 0); |
| 134 | glVertex3f( 1, 1, 0); |
| 135 | glVertex3f(-1, 1, 0); |
| 136 | glEnd(); |
| 137 | |
Brian Paul | dbe1eca | 2004-06-28 22:03:44 +0000 | [diff] [blame] | 138 | #if TEST_DISPLAY_LISTS |
| 139 | glNewList(11, GL_COMPILE); |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 140 | glEndQueryARB(GL_SAMPLES_PASSED_ARB); |
Brian Paul | dbe1eca | 2004-06-28 22:03:44 +0000 | [diff] [blame] | 141 | glEndList(); |
| 142 | glCallList(11); |
| 143 | #else |
| 144 | glEndQueryARB(GL_SAMPLES_PASSED_ARB); |
| 145 | #endif |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 146 | |
| 147 | do { |
| 148 | /* do useful work here, if any */ |
| 149 | glGetQueryObjectivARB(OccQuery, GL_QUERY_RESULT_AVAILABLE_ARB, &ready); |
| 150 | } while (!ready); |
| 151 | glGetQueryObjectuivARB(OccQuery, GL_QUERY_RESULT_ARB, &passed); |
| 152 | |
| 153 | /* turn off occlusion testing */ |
| 154 | glColorMask(1, 1, 1, 1); |
| 155 | glDepthMask(GL_TRUE); |
Brian Paul | b58091a | 2005-01-09 17:00:57 +0000 | [diff] [blame] | 156 | #endif /* GL_ARB_occlusion_query */ |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 157 | |
| 158 | /* draw the orange rect, so we can see what's going on */ |
| 159 | glColor3f(0.8, 0.5, 0); |
| 160 | glBegin(GL_POLYGON); |
| 161 | glVertex3f(-1, -1, 0); |
| 162 | glVertex3f( 1, -1, 0); |
| 163 | glVertex3f( 1, 1, 0); |
| 164 | glVertex3f(-1, 1, 0); |
| 165 | glEnd(); |
| 166 | |
| 167 | glPopMatrix(); |
| 168 | |
| 169 | |
| 170 | /* Print result message */ |
| 171 | glMatrixMode( GL_PROJECTION ); |
| 172 | glLoadIdentity(); |
| 173 | glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 ); |
| 174 | glMatrixMode( GL_MODELVIEW ); |
| 175 | glLoadIdentity(); |
| 176 | |
| 177 | glColor3f(1, 1, 1); |
Brian Paul | b58091a | 2005-01-09 17:00:57 +0000 | [diff] [blame] | 178 | #if defined(GL_ARB_occlusion_query) |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 179 | sprintf(s, " %4d Fragments Visible", passed); |
| 180 | glRasterPos3f(-0.50, -0.7, 0); |
| 181 | PrintString(s); |
| 182 | if (!passed) { |
| 183 | glRasterPos3f(-0.25, -0.8, 0); |
| 184 | PrintString("Fully Occluded"); |
| 185 | } |
Brian Paul | b58091a | 2005-01-09 17:00:57 +0000 | [diff] [blame] | 186 | #else |
| 187 | glRasterPos3f(-0.25, -0.8, 0); |
| 188 | PrintString("GL_ARB_occlusion_query not available at compile time"); |
| 189 | #endif /* GL_ARB_occlusion_query */ |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 190 | |
| 191 | glutSwapBuffers(); |
| 192 | } |
| 193 | |
| 194 | |
| 195 | static void Reshape( int width, int height ) |
| 196 | { |
| 197 | glViewport( 0, 0, width, height ); |
| 198 | } |
| 199 | |
| 200 | |
| 201 | static void Key( unsigned char key, int x, int y ) |
| 202 | { |
| 203 | (void) x; |
| 204 | (void) y; |
| 205 | switch (key) { |
| 206 | case 27: |
Brian Paul | 6c14bdc | 2008-12-18 09:48:20 -0700 | [diff] [blame] | 207 | glutDestroyWindow(Win); |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 208 | exit(0); |
| 209 | break; |
Brian Paul | 8fa5075 | 2003-06-13 02:42:57 +0000 | [diff] [blame] | 210 | case ' ': |
| 211 | Anim = !Anim; |
| 212 | if (Anim) |
| 213 | glutIdleFunc(Idle); |
| 214 | else |
| 215 | glutIdleFunc(NULL); |
| 216 | break; |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 217 | } |
| 218 | glutPostRedisplay(); |
| 219 | } |
| 220 | |
| 221 | |
| 222 | static void SpecialKey( int key, int x, int y ) |
| 223 | { |
| 224 | const GLfloat step = 0.1; |
| 225 | (void) x; |
| 226 | (void) y; |
| 227 | switch (key) { |
| 228 | case GLUT_KEY_LEFT: |
| 229 | Xpos -= step; |
| 230 | break; |
| 231 | case GLUT_KEY_RIGHT: |
| 232 | Xpos += step; |
| 233 | break; |
| 234 | } |
| 235 | glutPostRedisplay(); |
| 236 | } |
| 237 | |
| 238 | |
| 239 | static void Init( void ) |
| 240 | { |
| 241 | const char *ext = (const char *) glGetString(GL_EXTENSIONS); |
| 242 | GLint bits; |
| 243 | |
| 244 | if (!strstr(ext, "GL_ARB_occlusion_query")) { |
| 245 | printf("Sorry, this demo requires the GL_ARB_occlusion_query extension\n"); |
| 246 | exit(-1); |
| 247 | } |
| 248 | |
Brian Paul | b58091a | 2005-01-09 17:00:57 +0000 | [diff] [blame] | 249 | #if defined(GL_ARB_occlusion_query) |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 250 | glGetQueryivARB(GL_SAMPLES_PASSED_ARB, GL_QUERY_COUNTER_BITS_ARB, &bits); |
| 251 | if (!bits) { |
| 252 | printf("Hmmm, GL_QUERY_COUNTER_BITS_ARB is zero!\n"); |
| 253 | exit(-1); |
| 254 | } |
Brian Paul | b58091a | 2005-01-09 17:00:57 +0000 | [diff] [blame] | 255 | #endif /* GL_ARB_occlusion_query */ |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 256 | |
Brian Paul | dbe1eca | 2004-06-28 22:03:44 +0000 | [diff] [blame] | 257 | glGetIntegerv(GL_DEPTH_BITS, &bits); |
| 258 | printf("Depthbits: %d\n", bits); |
| 259 | |
Brian Paul | b58091a | 2005-01-09 17:00:57 +0000 | [diff] [blame] | 260 | #if defined(GL_ARB_occlusion_query) |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 261 | glGenQueriesARB(1, &OccQuery); |
Brian Paul | dbe1eca | 2004-06-28 22:03:44 +0000 | [diff] [blame] | 262 | assert(OccQuery > 0); |
Brian Paul | b58091a | 2005-01-09 17:00:57 +0000 | [diff] [blame] | 263 | #endif /* GL_ARB_occlusion_query */ |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 264 | |
| 265 | glEnable(GL_DEPTH_TEST); |
| 266 | } |
| 267 | |
| 268 | |
| 269 | int main( int argc, char *argv[] ) |
| 270 | { |
| 271 | glutInit( &argc, argv ); |
| 272 | glutInitWindowPosition( 0, 0 ); |
| 273 | glutInitWindowSize( 400, 400 ); |
| 274 | glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH ); |
Brian Paul | 6c14bdc | 2008-12-18 09:48:20 -0700 | [diff] [blame] | 275 | Win = glutCreateWindow(argv[0]); |
José Fonseca | 2e61d13 | 2009-01-24 16:39:49 +0000 | [diff] [blame] | 276 | glewInit(); |
Brian Paul | 8625803 | 2003-06-13 02:38:35 +0000 | [diff] [blame] | 277 | glutReshapeFunc( Reshape ); |
| 278 | glutKeyboardFunc( Key ); |
| 279 | glutSpecialFunc( SpecialKey ); |
| 280 | glutIdleFunc( Idle ); |
| 281 | glutDisplayFunc( Display ); |
| 282 | Init(); |
| 283 | glutMainLoop(); |
| 284 | return 0; |
| 285 | } |