Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Demo of off-screen Mesa rendering with 32-bit float color channels. |
| 3 | * This requires the libOSMesa32.so library. |
| 4 | * |
| 5 | * Compile with something like this: |
| 6 | * |
Brian Paul | 371f576 | 2005-01-29 13:48:27 +0000 | [diff] [blame] | 7 | * gcc osdemo32.c -I../../include -L../../lib -lglut -lGLU -lOSMesa32 -lm -o osdemo32 |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | |
| 11 | #include <stdio.h> |
| 12 | #include <stdlib.h> |
| 13 | #include "GL/osmesa.h" |
| 14 | #include "GL/glut.h" |
| 15 | |
| 16 | |
| 17 | #define SAVE_TARGA |
| 18 | |
| 19 | |
| 20 | #define WIDTH 400 |
| 21 | #define HEIGHT 400 |
| 22 | |
| 23 | |
| 24 | |
| 25 | static void render_image( void ) |
| 26 | { |
| 27 | GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 }; |
| 28 | GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 }; |
| 29 | GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 }; |
| 30 | GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 }; |
| 31 | GLfloat red_mat[] = { 1.0, 0.2, 0.2, 1.0 }; |
| 32 | GLfloat green_mat[] = { 0.2, 1.0, 0.2, 0.5 }; |
| 33 | GLfloat blue_mat[] = { 0.2, 0.2, 1.0, 1.0 }; |
| 34 | GLfloat white_mat[] = { 1.0, 1.0, 1.0, 1.0 }; |
| 35 | GLfloat purple_mat[] = { 1.0, 0.2, 1.0, 1.0 }; |
| 36 | GLUquadricObj *qobj = gluNewQuadric(); |
| 37 | |
| 38 | glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient); |
| 39 | glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); |
| 40 | glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular); |
| 41 | glLightfv(GL_LIGHT0, GL_POSITION, light_position); |
| 42 | |
| 43 | glEnable(GL_LIGHTING); |
| 44 | glEnable(GL_LIGHT0); |
| 45 | glEnable(GL_DEPTH_TEST); |
| 46 | |
| 47 | glMatrixMode(GL_PROJECTION); |
| 48 | glLoadIdentity(); |
| 49 | glOrtho(-2.5, 2.5, -2.5, 2.5, -10.0, 10.0); |
| 50 | glMatrixMode(GL_MODELVIEW); |
| 51 | |
| 52 | glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); |
| 53 | |
| 54 | glPushMatrix(); |
| 55 | glRotatef(20.0, 1.0, 0.0, 0.0); |
| 56 | |
| 57 | #if 0 |
| 58 | glPushMatrix(); |
| 59 | glTranslatef(-0.75, 0.5, 0.0); |
| 60 | glRotatef(90.0, 1.0, 0.0, 0.0); |
| 61 | glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red_mat ); |
| 62 | glutSolidTorus(0.275, 0.85, 20, 20); |
| 63 | glPopMatrix(); |
| 64 | #endif |
| 65 | |
| 66 | /* red square */ |
| 67 | glPushMatrix(); |
| 68 | glTranslatef(0.0, -0.5, 0.0); |
| 69 | glRotatef(90, 1, 0.5, 0); |
| 70 | glScalef(3, 3, 3); |
| 71 | glDisable(GL_LIGHTING); |
| 72 | glColor4f(1, 0, 0, 0.5); |
| 73 | glBegin(GL_POLYGON); |
| 74 | glVertex2f(-1, -1); |
| 75 | glVertex2f( 1, -1); |
| 76 | glVertex2f( 1, 1); |
| 77 | glVertex2f(-1, 1); |
| 78 | glEnd(); |
| 79 | glEnable(GL_LIGHTING); |
| 80 | glPopMatrix(); |
| 81 | |
| 82 | #if 0 |
| 83 | /* green square */ |
| 84 | glPushMatrix(); |
| 85 | glTranslatef(0.0, 0.5, 0.1); |
| 86 | glDisable(GL_LIGHTING); |
| 87 | glColor3f(0, 1, 0); |
| 88 | glBegin(GL_POLYGON); |
| 89 | glVertex2f(-1, -1); |
| 90 | glVertex2f( 1, -1); |
| 91 | glVertex2f( 1, 1); |
| 92 | glVertex2f(-1, 1); |
| 93 | glEnd(); |
| 94 | glEnable(GL_LIGHTING); |
| 95 | glPopMatrix(); |
| 96 | |
| 97 | /* blue square */ |
| 98 | glPushMatrix(); |
| 99 | glTranslatef(0.75, 0.5, 0.3); |
| 100 | glDisable(GL_LIGHTING); |
| 101 | glColor3f(0, 0, 0.5); |
| 102 | glBegin(GL_POLYGON); |
| 103 | glVertex2f(-1, -1); |
| 104 | glVertex2f( 1, -1); |
| 105 | glVertex2f( 1, 1); |
| 106 | glVertex2f(-1, 1); |
| 107 | glEnd(); |
| 108 | glEnable(GL_LIGHTING); |
| 109 | glPopMatrix(); |
| 110 | #endif |
| 111 | glPushMatrix(); |
| 112 | glTranslatef(-0.75, -0.5, 0.0); |
| 113 | glRotatef(270.0, 1.0, 0.0, 0.0); |
| 114 | glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green_mat ); |
| 115 | glColor4f(0,1,0,0.5); |
| 116 | glEnable(GL_BLEND); |
| 117 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
| 118 | gluCylinder(qobj, 1.0, 0.0, 2.0, 16, 1); |
| 119 | glDisable(GL_BLEND); |
| 120 | glPopMatrix(); |
| 121 | |
| 122 | glPushMatrix(); |
| 123 | glTranslatef(0.75, 1.0, 1.0); |
| 124 | glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat ); |
| 125 | gluSphere(qobj, 1.0, 20, 20); |
| 126 | glPopMatrix(); |
| 127 | |
| 128 | glPopMatrix(); |
| 129 | |
Brian Paul | c84cde7 | 2005-01-29 12:57:36 +0000 | [diff] [blame] | 130 | /* This is very important!!! |
| 131 | * Make sure buffered commands are finished!!! |
| 132 | */ |
| 133 | glFinish(); |
| 134 | |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 135 | gluDeleteQuadric(qobj); |
| 136 | |
| 137 | { |
| 138 | GLint r, g, b, a; |
| 139 | glGetIntegerv(GL_RED_BITS, &r); |
| 140 | glGetIntegerv(GL_GREEN_BITS, &g); |
| 141 | glGetIntegerv(GL_BLUE_BITS, &b); |
| 142 | glGetIntegerv(GL_ALPHA_BITS, &a); |
| 143 | printf("channel sizes: %d %d %d %d\n", r, g, b, a); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | |
| 148 | |
| 149 | static void |
| 150 | write_targa(const char *filename, const GLfloat *buffer, int width, int height) |
| 151 | { |
| 152 | FILE *f = fopen( filename, "w" ); |
| 153 | if (f) { |
| 154 | int i, x, y; |
| 155 | const GLfloat *ptr = buffer; |
| 156 | printf ("osdemo, writing tga file \n"); |
| 157 | fputc (0x00, f); /* ID Length, 0 => No ID */ |
| 158 | fputc (0x00, f); /* Color Map Type, 0 => No color map included */ |
| 159 | fputc (0x02, f); /* Image Type, 2 => Uncompressed, True-color Image */ |
| 160 | fputc (0x00, f); /* Next five bytes are about the color map entries */ |
| 161 | fputc (0x00, f); /* 2 bytes Index, 2 bytes length, 1 byte size */ |
| 162 | fputc (0x00, f); |
| 163 | fputc (0x00, f); |
| 164 | fputc (0x00, f); |
| 165 | fputc (0x00, f); /* X-origin of Image */ |
| 166 | fputc (0x00, f); |
| 167 | fputc (0x00, f); /* Y-origin of Image */ |
| 168 | fputc (0x00, f); |
| 169 | fputc (WIDTH & 0xff, f); /* Image Width */ |
| 170 | fputc ((WIDTH>>8) & 0xff, f); |
| 171 | fputc (HEIGHT & 0xff, f); /* Image Height */ |
| 172 | fputc ((HEIGHT>>8) & 0xff, f); |
| 173 | fputc (0x18, f); /* Pixel Depth, 0x18 => 24 Bits */ |
| 174 | fputc (0x20, f); /* Image Descriptor */ |
| 175 | fclose(f); |
| 176 | f = fopen( filename, "ab" ); /* reopen in binary append mode */ |
| 177 | for (y=height-1; y>=0; y--) { |
| 178 | for (x=0; x<width; x++) { |
| 179 | int r, g, b; |
| 180 | i = (y*width + x) * 4; |
| 181 | r = (int) (ptr[i+0] * 255.0); |
| 182 | g = (int) (ptr[i+1] * 255.0); |
| 183 | b = (int) (ptr[i+2] * 255.0); |
| 184 | if (r > 255) r = 255; |
| 185 | if (g > 255) g = 255; |
| 186 | if (b > 255) b = 255; |
| 187 | fputc(b, f); /* write blue */ |
| 188 | fputc(g, f); /* write green */ |
| 189 | fputc(r, f); /* write red */ |
| 190 | } |
| 191 | } |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | |
| 196 | static void |
Brian Paul | 371f576 | 2005-01-29 13:48:27 +0000 | [diff] [blame] | 197 | write_ppm(const char *filename, const GLfloat *buffer, int width, int height) |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 198 | { |
| 199 | const int binary = 0; |
| 200 | FILE *f = fopen( filename, "w" ); |
| 201 | if (f) { |
| 202 | int i, x, y; |
Brian Paul | 371f576 | 2005-01-29 13:48:27 +0000 | [diff] [blame] | 203 | const GLfloat *ptr = buffer; |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 204 | if (binary) { |
| 205 | fprintf(f,"P6\n"); |
| 206 | fprintf(f,"# ppm-file created by osdemo.c\n"); |
| 207 | fprintf(f,"%i %i\n", width,height); |
| 208 | fprintf(f,"255\n"); |
| 209 | fclose(f); |
| 210 | f = fopen( filename, "ab" ); /* reopen in binary append mode */ |
| 211 | for (y=height-1; y>=0; y--) { |
| 212 | for (x=0; x<width; x++) { |
Brian Paul | 371f576 | 2005-01-29 13:48:27 +0000 | [diff] [blame] | 213 | int r, g, b; |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 214 | i = (y*width + x) * 4; |
Brian Paul | 371f576 | 2005-01-29 13:48:27 +0000 | [diff] [blame] | 215 | r = (int) (ptr[i+0] * 255.0); |
| 216 | g = (int) (ptr[i+1] * 255.0); |
| 217 | b = (int) (ptr[i+2] * 255.0); |
| 218 | if (r > 255) r = 255; |
| 219 | if (g > 255) g = 255; |
| 220 | if (b > 255) b = 255; |
| 221 | fputc(r, f); /* write red */ |
| 222 | fputc(g, f); /* write green */ |
| 223 | fputc(b, f); /* write blue */ |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 224 | } |
| 225 | } |
| 226 | } |
| 227 | else { |
| 228 | /*ASCII*/ |
| 229 | int counter = 0; |
| 230 | fprintf(f,"P3\n"); |
| 231 | fprintf(f,"# ascii ppm file created by osdemo.c\n"); |
| 232 | fprintf(f,"%i %i\n", width, height); |
| 233 | fprintf(f,"255\n"); |
| 234 | for (y=height-1; y>=0; y--) { |
| 235 | for (x=0; x<width; x++) { |
Brian Paul | 371f576 | 2005-01-29 13:48:27 +0000 | [diff] [blame] | 236 | int r, g, b; |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 237 | i = (y*width + x) * 4; |
Brian Paul | 371f576 | 2005-01-29 13:48:27 +0000 | [diff] [blame] | 238 | r = (int) (ptr[i+0] * 255.0); |
| 239 | g = (int) (ptr[i+1] * 255.0); |
| 240 | b = (int) (ptr[i+2] * 255.0); |
| 241 | if (r > 255) r = 255; |
| 242 | if (g > 255) g = 255; |
| 243 | if (b > 255) b = 255; |
| 244 | fprintf(f, " %3d %3d %3d", r, g, b); |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 245 | counter++; |
| 246 | if (counter % 5 == 0) |
| 247 | fprintf(f, "\n"); |
| 248 | } |
| 249 | } |
| 250 | } |
| 251 | fclose(f); |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | |
| 256 | |
| 257 | int main( int argc, char *argv[] ) |
| 258 | { |
Brian Paul | 371f576 | 2005-01-29 13:48:27 +0000 | [diff] [blame] | 259 | GLfloat *buffer; |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 260 | |
| 261 | /* Create an RGBA-mode context */ |
| 262 | #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305 |
| 263 | /* specify Z, stencil, accum sizes */ |
| 264 | OSMesaContext ctx = OSMesaCreateContextExt( GL_RGBA, 16, 0, 0, NULL ); |
| 265 | #else |
| 266 | OSMesaContext ctx = OSMesaCreateContext( GL_RGBA, NULL ); |
| 267 | #endif |
| 268 | if (!ctx) { |
| 269 | printf("OSMesaCreateContext failed!\n"); |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | /* Allocate the image buffer */ |
Brian Paul | 371f576 | 2005-01-29 13:48:27 +0000 | [diff] [blame] | 274 | buffer = (GLfloat *) malloc( WIDTH * HEIGHT * 4 * sizeof(GLfloat)); |
Brian Paul | 7d01c34 | 2004-09-24 23:00:52 +0000 | [diff] [blame] | 275 | if (!buffer) { |
| 276 | printf("Alloc image buffer failed!\n"); |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | /* Bind the buffer to the context and make it current */ |
| 281 | if (!OSMesaMakeCurrent( ctx, buffer, GL_FLOAT, WIDTH, HEIGHT )) { |
| 282 | printf("OSMesaMakeCurrent failed!\n"); |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | render_image(); |
| 287 | |
| 288 | if (argc>1) { |
| 289 | #ifdef SAVE_TARGA |
| 290 | write_targa(argv[1], buffer, WIDTH, HEIGHT); |
| 291 | #else |
| 292 | write_ppm(argv[1], buffer, WIDTH, HEIGHT); |
| 293 | #endif |
| 294 | } |
| 295 | else { |
| 296 | printf("Specify a filename if you want to make an image file\n"); |
| 297 | } |
| 298 | |
| 299 | printf("all done\n"); |
| 300 | |
| 301 | /* free the image buffer */ |
| 302 | free( buffer ); |
| 303 | |
| 304 | /* destroy the context */ |
| 305 | OSMesaDestroyContext( ctx ); |
| 306 | |
| 307 | return 0; |
| 308 | } |