Brian Paul | f6e806a | 2008-10-09 19:45:03 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Simple test of multiple textures |
| 3 | */ |
| 4 | |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <math.h> |
| 9 | #include <GL/glut.h> |
| 10 | #include "readtex.h" |
| 11 | |
| 12 | #define MAX_TEXTURES 8 |
| 13 | |
| 14 | |
| 15 | static int Win; |
| 16 | static GLfloat Xrot = 0, Yrot = 0, Zrot = 0; |
| 17 | static GLboolean Anim = GL_TRUE; |
| 18 | static GLboolean Blend = GL_FALSE; |
| 19 | static GLboolean MipMap = 1+GL_FALSE; |
| 20 | |
| 21 | static GLuint NumTextures; |
| 22 | static GLuint Textures[MAX_TEXTURES]; |
| 23 | static float TexRot[MAX_TEXTURES][3]; |
| 24 | static float TexPos[MAX_TEXTURES][3]; |
| 25 | static float TexAspect[MAX_TEXTURES]; |
| 26 | |
| 27 | static const char *DefaultFiles[] = { |
| 28 | "../images/arch.rgb", |
| 29 | "../images/reflect.rgb", |
| 30 | "../images/tree2.rgba", |
| 31 | "../images/tile.rgb" |
| 32 | }; |
| 33 | |
| 34 | |
| 35 | static void |
| 36 | Idle(void) |
| 37 | { |
| 38 | Xrot = glutGet(GLUT_ELAPSED_TIME) * 0.02; |
| 39 | Yrot = glutGet(GLUT_ELAPSED_TIME) * 0.04; |
| 40 | //Zrot += 2.0; |
| 41 | glutPostRedisplay(); |
| 42 | } |
| 43 | |
| 44 | |
| 45 | static void |
| 46 | DrawTextures(void) |
| 47 | { |
| 48 | GLuint i; |
| 49 | |
| 50 | for (i = 0; i < NumTextures; i++) { |
| 51 | GLfloat ar = TexAspect[i]; |
| 52 | |
| 53 | glPushMatrix(); |
| 54 | glTranslatef(TexPos[i][0], TexPos[i][1], TexPos[i][2]); |
| 55 | glRotatef(TexRot[i][0], 1, 0, 0); |
| 56 | glRotatef(TexRot[i][1], 0, 1, 0); |
| 57 | glRotatef(TexRot[i][2], 0, 0, 1); |
| 58 | |
| 59 | glBindTexture(GL_TEXTURE_2D, Textures[i]); |
| 60 | glBegin(GL_POLYGON); |
| 61 | glTexCoord2f( 0.0, 0.0 ); glVertex2f( -ar, -1.0 ); |
| 62 | glTexCoord2f( 1.0, 0.0 ); glVertex2f( ar, -1.0 ); |
| 63 | glTexCoord2f( 1.0, 1.0 ); glVertex2f( ar, 1.0 ); |
| 64 | glTexCoord2f( 0.0, 1.0 ); glVertex2f( -ar, 1.0 ); |
| 65 | glEnd(); |
| 66 | |
| 67 | glPopMatrix(); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | static void |
| 72 | Draw(void) |
| 73 | { |
| 74 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| 75 | |
| 76 | if (Blend) { |
| 77 | glEnable(GL_BLEND); |
| 78 | glDisable(GL_DEPTH_TEST); |
| 79 | } |
| 80 | else { |
| 81 | glDisable(GL_BLEND); |
| 82 | glEnable(GL_DEPTH_TEST); |
| 83 | } |
| 84 | |
| 85 | glPushMatrix(); |
| 86 | glRotatef(Xrot, 1, 0, 0); |
| 87 | glRotatef(Yrot, 0, 1, 0); |
| 88 | glRotatef(Zrot, 0, 0, 1); |
| 89 | |
| 90 | DrawTextures(); |
| 91 | |
| 92 | glPopMatrix(); |
| 93 | |
| 94 | glutSwapBuffers(); |
| 95 | } |
| 96 | |
| 97 | |
| 98 | static void |
| 99 | Reshape(int width, int height) |
| 100 | { |
| 101 | glViewport(0, 0, width, height); |
| 102 | glMatrixMode(GL_PROJECTION); |
| 103 | glLoadIdentity(); |
| 104 | glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 50.0); |
| 105 | glMatrixMode(GL_MODELVIEW); |
| 106 | glLoadIdentity(); |
| 107 | glTranslatef(0.0, 0.0, -10.0); |
| 108 | } |
| 109 | |
| 110 | |
| 111 | static GLfloat |
| 112 | RandFloat(float min, float max) |
| 113 | { |
| 114 | float x = (float) (rand() % 1000) * 0.001; |
| 115 | x = x * (max - min) + min; |
| 116 | return x; |
| 117 | } |
| 118 | |
| 119 | |
| 120 | static void |
| 121 | Randomize(void) |
| 122 | { |
| 123 | GLfloat k = 1.0; |
| 124 | GLuint i; |
| 125 | |
| 126 | srand(glutGet(GLUT_ELAPSED_TIME)); |
| 127 | |
| 128 | for (i = 0; i < NumTextures; i++) { |
| 129 | TexRot[i][0] = RandFloat(0.0, 360); |
| 130 | TexRot[i][1] = RandFloat(0.0, 360); |
| 131 | TexRot[i][2] = RandFloat(0.0, 360); |
| 132 | TexPos[i][0] = RandFloat(-k, k); |
| 133 | TexPos[i][1] = RandFloat(-k, k); |
| 134 | TexPos[i][2] = RandFloat(-k, k); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | |
| 139 | static void |
| 140 | SetTexFilters(void) |
| 141 | { |
| 142 | GLuint i; |
| 143 | for (i = 0; i < NumTextures; i++) { |
| 144 | glBindTexture(GL_TEXTURE_2D, Textures[i]); |
| 145 | if (MipMap) { |
| 146 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, |
| 147 | GL_LINEAR_MIPMAP_LINEAR); |
| 148 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| 149 | } |
| 150 | else { |
| 151 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| 152 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| 153 | } |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | |
| 158 | static void |
| 159 | Key(unsigned char key, int x, int y) |
| 160 | { |
| 161 | const GLfloat step = 3.0; |
| 162 | (void) x; |
| 163 | (void) y; |
| 164 | switch (key) { |
| 165 | case 'a': |
| 166 | Anim = !Anim; |
| 167 | if (Anim) |
| 168 | glutIdleFunc(Idle); |
| 169 | else |
| 170 | glutIdleFunc(NULL); |
| 171 | break; |
| 172 | case 'b': |
| 173 | Blend = !Blend; |
| 174 | break; |
| 175 | case 'm': |
| 176 | MipMap = !MipMap; |
| 177 | SetTexFilters(); |
| 178 | break; |
| 179 | case 'r': |
| 180 | Randomize(); |
| 181 | case 'z': |
| 182 | Zrot -= step; |
| 183 | break; |
| 184 | case 'Z': |
| 185 | Zrot += step; |
| 186 | break; |
| 187 | case 27: |
| 188 | glutDestroyWindow(Win); |
| 189 | exit(0); |
| 190 | break; |
| 191 | } |
| 192 | |
| 193 | printf("Blend=%s MipMap=%s\n", |
| 194 | Blend ? "Y" : "n", |
| 195 | MipMap ? "Y" : "n"); |
| 196 | |
| 197 | glutPostRedisplay(); |
| 198 | } |
| 199 | |
| 200 | |
| 201 | static void |
| 202 | SpecialKey(int key, int x, int y) |
| 203 | { |
| 204 | const GLfloat step = 3.0; |
| 205 | (void) x; |
| 206 | (void) y; |
| 207 | switch (key) { |
| 208 | case GLUT_KEY_UP: |
| 209 | Xrot -= step; |
| 210 | break; |
| 211 | case GLUT_KEY_DOWN: |
| 212 | Xrot += step; |
| 213 | break; |
| 214 | case GLUT_KEY_LEFT: |
| 215 | Yrot -= step; |
| 216 | break; |
| 217 | case GLUT_KEY_RIGHT: |
| 218 | Yrot += step; |
| 219 | break; |
| 220 | } |
| 221 | glutPostRedisplay(); |
| 222 | } |
| 223 | |
| 224 | |
| 225 | static void |
| 226 | LoadTextures(GLuint n, const char *files[]) |
| 227 | { |
| 228 | GLuint i; |
| 229 | |
| 230 | NumTextures = n < MAX_TEXTURES ? n : MAX_TEXTURES; |
| 231 | |
| 232 | glGenTextures(n, Textures); |
| 233 | |
| 234 | for (i = 0; i < n; i++) { |
| 235 | GLint w, h; |
| 236 | glBindTexture(GL_TEXTURE_2D, Textures[i]); |
| 237 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| 238 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| 239 | if (!LoadRGBMipmaps2(files[i], GL_TEXTURE_2D, GL_RGB, &w, &h)) { |
| 240 | printf("Error: couldn't load %s\n", files[i]); |
| 241 | exit(1); |
| 242 | } |
| 243 | TexAspect[i] = (float) w / (float) h; |
| 244 | printf("Loaded %s\n", files[i]); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | |
| 249 | static void |
| 250 | Init(int argc, const char *argv[]) |
| 251 | { |
| 252 | if (argc == 1) |
| 253 | LoadTextures(4, DefaultFiles); |
| 254 | else |
| 255 | LoadTextures(argc - 1, argv + 1); |
| 256 | |
| 257 | Randomize(); |
| 258 | |
| 259 | glEnable(GL_TEXTURE_2D); |
| 260 | |
| 261 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
| 262 | glColor4f(1, 1, 1, 0.5); |
| 263 | |
| 264 | #if 0 |
| 265 | /* setup lighting, etc */ |
| 266 | glEnable(GL_LIGHTING); |
| 267 | glEnable(GL_LIGHT0); |
| 268 | #endif |
| 269 | } |
| 270 | |
| 271 | |
| 272 | static void |
| 273 | Usage(void) |
| 274 | { |
| 275 | printf("Usage:\n"); |
| 276 | printf(" textures [file.rgb] ...\n"); |
| 277 | printf("Keys:\n"); |
| 278 | printf(" a - toggle animation\n"); |
| 279 | printf(" b - toggle blending\n"); |
| 280 | printf(" m - toggle mipmapping\n"); |
| 281 | printf(" r - randomize\n"); |
| 282 | printf(" ESC - exit\n"); |
| 283 | } |
| 284 | |
| 285 | |
| 286 | int |
| 287 | main(int argc, char *argv[]) |
| 288 | { |
| 289 | glutInit(&argc, argv); |
| 290 | glutInitWindowPosition(0, 0); |
| 291 | glutInitWindowSize(400, 400); |
| 292 | glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); |
| 293 | Win = glutCreateWindow(argv[0]); |
| 294 | glutReshapeFunc(Reshape); |
| 295 | glutKeyboardFunc(Key); |
| 296 | glutSpecialFunc(SpecialKey); |
| 297 | glutDisplayFunc(Draw); |
| 298 | if (Anim) |
| 299 | glutIdleFunc(Idle); |
| 300 | Init(argc, (const char **) argv); |
| 301 | Usage(); |
| 302 | glutMainLoop(); |
| 303 | return 0; |
| 304 | } |