Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc. |
| 3 | * |
| 4 | * Permission to use, copy, modify, distribute, and sell this software and |
| 5 | * its documentation for any purpose is hereby granted without fee, provided |
| 6 | * that (i) the above copyright notices and this permission notice appear in |
| 7 | * all copies of the software and related documentation, and (ii) the name of |
| 8 | * Silicon Graphics may not be used in any advertising or |
| 9 | * publicity relating to the software without the specific, prior written |
| 10 | * permission of Silicon Graphics. |
| 11 | * |
| 12 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF |
| 13 | * ANY KIND, |
| 14 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
| 15 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
| 16 | * |
| 17 | * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR |
| 18 | * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
| 19 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| 20 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
| 21 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| 22 | * OF THIS SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include <string.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <GL/glut.h> |
| 29 | |
| 30 | GLenum doubleBuffer = 1; |
| 31 | int win; |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 32 | static float tx = 0; |
| 33 | static float ty = 0; |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 34 | static float tw = 0; |
| 35 | static float th = 0; |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 36 | static float z = -5; |
| 37 | |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 38 | |
| 39 | static float win_width = 250; |
| 40 | static float win_height = 250; |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 41 | static enum { |
| 42 | ORTHO, |
| 43 | FRUSTUM, |
| 44 | MODE_MAX |
| 45 | } mode = ORTHO; |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 46 | |
| 47 | static void Init(void) |
| 48 | { |
| 49 | fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); |
| 50 | fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); |
| 51 | fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); |
Keith Whitwell | eb9801c | 2009-03-24 16:35:29 +0000 | [diff] [blame] | 52 | fflush(stderr); |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 53 | |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 54 | glClearColor(0, 0, 0, 0.0); |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | static void Reshape(int width, int height) |
| 58 | { |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 59 | win_width = width; |
| 60 | win_height = height; |
| 61 | glutPostRedisplay(); |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 62 | } |
| 63 | |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 64 | |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 65 | static void Key(unsigned char key, int x, int y) |
| 66 | { |
| 67 | switch (key) { |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 68 | case 27: |
| 69 | exit(0); |
| 70 | case 'w': |
| 71 | tw += 1.0; |
| 72 | break; |
| 73 | case 'W': |
| 74 | tw -= 1.0; |
| 75 | break; |
| 76 | case 'h': |
| 77 | th += 1.0; |
| 78 | break; |
| 79 | case 'H': |
| 80 | th -= 1.0; |
| 81 | break; |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 82 | |
| 83 | case 'z': |
| 84 | z += 1.0; |
| 85 | break; |
| 86 | case 'Z': |
| 87 | z -= 1.0; |
| 88 | break; |
| 89 | case 'm': |
| 90 | mode++; |
| 91 | mode %= MODE_MAX; |
| 92 | break; |
Keith Whitwell | a38f7d9 | 2009-04-20 17:32:15 +0100 | [diff] [blame] | 93 | case ' ': |
| 94 | tw = th = tx = ty = 0; |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 95 | z = -5; |
| 96 | mode = ORTHO; |
Keith Whitwell | a38f7d9 | 2009-04-20 17:32:15 +0100 | [diff] [blame] | 97 | break; |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 98 | default: |
| 99 | break; |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 100 | } |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 101 | glutPostRedisplay(); |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 102 | } |
| 103 | |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 104 | |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 105 | static void Draw(void) |
| 106 | { |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 107 | int i; |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 108 | float w = tw + win_width; |
| 109 | float h = th + win_height; |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 110 | |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 111 | fprintf(stderr, "glViewport(%f %f %f %f)\n", tx, ty, w, h); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 112 | fprintf(stderr, "mode: %s\n", mode == FRUSTUM ? "FRUSTUM" : "ORTHO"); |
| 113 | fprintf(stderr, "z: %f\n", z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 114 | fflush(stderr); |
| 115 | |
| 116 | glMatrixMode(GL_PROJECTION); |
| 117 | glLoadIdentity(); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 118 | |
| 119 | switch (mode) { |
| 120 | case FRUSTUM: |
| 121 | glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0); |
| 122 | break; |
| 123 | case ORTHO: |
| 124 | default: |
| 125 | glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); |
| 126 | break; |
| 127 | } |
| 128 | |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 129 | glMatrixMode(GL_MODELVIEW); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 130 | glLoadIdentity(); |
| 131 | |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 132 | |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 133 | glClear(GL_COLOR_BUFFER_BIT); |
| 134 | |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 135 | |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 136 | /*********************************************************************** |
| 137 | * Should be clipped to be no larger than the triangles: |
| 138 | */ |
| 139 | glViewport(tx, ty, w, h); |
Keith Whitwell | 6e05224 | 2009-04-21 10:59:54 +0100 | [diff] [blame] | 140 | |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 141 | glBegin(GL_POLYGON); |
Keith Whitwell | 6e05224 | 2009-04-21 10:59:54 +0100 | [diff] [blame] | 142 | glColor3f(1,1,0); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 143 | glVertex3f(-100, -100, z); |
| 144 | glVertex3f(-100, 100, z); |
| 145 | glVertex3f(100, 100, z); |
| 146 | glVertex3f(100, -100, z); |
Keith Whitwell | 6e05224 | 2009-04-21 10:59:54 +0100 | [diff] [blame] | 147 | glEnd(); |
| 148 | |
| 149 | glBegin(GL_POLYGON); |
| 150 | glColor3f(0,1,1); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 151 | glVertex3f(-10, -10, z); |
| 152 | glVertex3f(-10, 10, z); |
| 153 | glVertex3f(10, 10, z); |
| 154 | glVertex3f(10, -10, z); |
Keith Whitwell | 6e05224 | 2009-04-21 10:59:54 +0100 | [diff] [blame] | 155 | glEnd(); |
| 156 | |
| 157 | glBegin(GL_POLYGON); |
| 158 | glColor3f(1,0,0); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 159 | glVertex3f(-2, -2, z); |
| 160 | glVertex3f(-2, 2, z); |
| 161 | glVertex3f(2, 2, z); |
| 162 | glVertex3f(2, -2, z); |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 163 | glEnd(); |
| 164 | |
Keith Whitwell | 6e05224 | 2009-04-21 10:59:54 +0100 | [diff] [blame] | 165 | |
| 166 | glBegin(GL_POLYGON); |
| 167 | glColor3f(.5,.5,1); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 168 | glVertex3f(-1, -1, z); |
| 169 | glVertex3f(-1, 1, z); |
| 170 | glVertex3f(1, 1, z); |
| 171 | glVertex3f(1, -1, z); |
Keith Whitwell | 6e05224 | 2009-04-21 10:59:54 +0100 | [diff] [blame] | 172 | glEnd(); |
| 173 | |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 174 | /*********************************************************************** |
| 175 | */ |
| 176 | glViewport(0, 0, win_width, win_height); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 177 | glBegin(GL_LINES); |
| 178 | glColor3f(1,1,0); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 179 | glVertex3f(-1, 0, z); |
| 180 | glVertex3f(1, 0, z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 181 | |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 182 | glVertex3f(0, -1, z); |
| 183 | glVertex3f(0, 1, z); |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 184 | glEnd(); |
| 185 | |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 186 | |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 187 | /*********************************************************************** |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 188 | */ |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 189 | glViewport(tx, ty, w, h); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 190 | glBegin(GL_TRIANGLES); |
| 191 | glColor3f(1,0,0); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 192 | glVertex3f(-1, -1, z); |
| 193 | glVertex3f(0, -1, z); |
| 194 | glVertex3f(-.5, -.5, z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 195 | |
| 196 | glColor3f(1,1,1); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 197 | glVertex3f(0, -1, z); |
| 198 | glVertex3f(1, -1, z); |
| 199 | glVertex3f(.5, -.5, z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 200 | |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 201 | glVertex3f(-.5, -.5, z); |
| 202 | glVertex3f(.5, -.5, z); |
| 203 | glVertex3f(0, 0, z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 204 | |
| 205 | |
| 206 | glColor3f(0,1,0); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 207 | glVertex3f(1, 1, z); |
| 208 | glVertex3f(0, 1, z); |
| 209 | glVertex3f(.5, .5, z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 210 | |
| 211 | glColor3f(1,1,1); |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 212 | glVertex3f(0, 1, z); |
| 213 | glVertex3f(-1, 1, z); |
| 214 | glVertex3f(-.5, .5, z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 215 | |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 216 | glVertex3f(.5, .5, z); |
| 217 | glVertex3f(-.5, .5, z); |
| 218 | glVertex3f( 0, 0, z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 219 | |
| 220 | glEnd(); |
| 221 | |
| 222 | |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 223 | glViewport(0, 0, win_width, win_height); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 224 | |
| 225 | glBegin(GL_LINES); |
| 226 | glColor3f(.5,.5,0); |
| 227 | for (i = -10; i < 10; i++) { |
| 228 | float f = i / 10.0; |
| 229 | |
| 230 | if (i == 0) |
| 231 | continue; |
| 232 | |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 233 | glVertex3f(-1, f, z); |
| 234 | glVertex3f(1, f, z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 235 | |
Keith Whitwell | e20f837 | 2009-04-21 11:40:59 +0100 | [diff] [blame] | 236 | glVertex3f(f, -1, z); |
| 237 | glVertex3f(f, 1, z); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 238 | } |
| 239 | glEnd(); |
| 240 | |
| 241 | |
| 242 | |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 243 | glFlush(); |
| 244 | |
| 245 | if (doubleBuffer) { |
| 246 | glutSwapBuffers(); |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | static GLenum Args(int argc, char **argv) |
| 251 | { |
| 252 | GLint i; |
| 253 | |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 254 | if (getenv("VPX")) |
| 255 | tx = atof(getenv("VPX")); |
| 256 | |
| 257 | if (getenv("VPY")) |
| 258 | ty = atof(getenv("VPY")); |
| 259 | |
| 260 | |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 261 | for (i = 1; i < argc; i++) { |
| 262 | if (strcmp(argv[i], "-sb") == 0) { |
| 263 | doubleBuffer = GL_FALSE; |
| 264 | } else if (strcmp(argv[i], "-db") == 0) { |
| 265 | doubleBuffer = GL_TRUE; |
| 266 | } else { |
| 267 | fprintf(stderr, "%s (Bad option).\n", argv[i]); |
| 268 | return GL_FALSE; |
| 269 | } |
| 270 | } |
| 271 | return GL_TRUE; |
| 272 | } |
| 273 | |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 274 | |
| 275 | static void |
| 276 | special(int k, int x, int y) |
| 277 | { |
| 278 | switch (k) { |
| 279 | case GLUT_KEY_UP: |
| 280 | ty += 1.0; |
| 281 | break; |
| 282 | case GLUT_KEY_DOWN: |
| 283 | ty -= 1.0; |
| 284 | break; |
| 285 | case GLUT_KEY_LEFT: |
| 286 | tx -= 1.0; |
| 287 | break; |
| 288 | case GLUT_KEY_RIGHT: |
| 289 | tx += 1.0; |
| 290 | break; |
| 291 | default: |
Keith Whitwell | 6bfcffa | 2009-04-20 17:30:53 +0100 | [diff] [blame] | 292 | break; |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 293 | } |
| 294 | glutPostRedisplay(); |
| 295 | } |
| 296 | |
| 297 | |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 298 | int main(int argc, char **argv) |
| 299 | { |
| 300 | GLenum type; |
| 301 | |
| 302 | glutInit(&argc, argv); |
| 303 | |
| 304 | if (Args(argc, argv) == GL_FALSE) { |
| 305 | exit(1); |
| 306 | } |
| 307 | |
| 308 | glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250); |
| 309 | |
| 310 | type = GLUT_RGB | GLUT_ALPHA; |
| 311 | type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; |
| 312 | glutInitDisplayMode(type); |
| 313 | |
| 314 | win = glutCreateWindow(*argv); |
| 315 | if (!win) { |
| 316 | exit(1); |
| 317 | } |
| 318 | |
| 319 | Init(); |
| 320 | |
| 321 | glutReshapeFunc(Reshape); |
Keith Whitwell | c691f96 | 2009-04-20 15:50:44 +0100 | [diff] [blame] | 322 | glutKeyboardFunc(Key); |
| 323 | glutSpecialFunc(special); |
Jakob Bornecrantz | bd2f921 | 2009-02-21 11:58:48 +0100 | [diff] [blame] | 324 | glutDisplayFunc(Draw); |
| 325 | glutMainLoop(); |
| 326 | return 0; |
| 327 | } |