progs/tests/osdemo16.c

   1 /* $Id: osdemo16.c,v 1.1 2001/03/08 15:24:18 brianp Exp $ */
   2
   3 /*
   4  * Demo of off-screen Mesa rendering
   5  *
   6  * See Mesa/include/GL/osmesa.h for documentation of the OSMesa functions.
   7  *
   8  * If you want to render BIG images you'll probably have to increase
   9  * MAX_WIDTH and MAX_HEIGHT in src/config.h.
  10  *
  11  * This program is in the public domain.
  12  *
  13  * Brian Paul
  14  *
  15  * PPM output provided by Joerg Schmalzl.
  16  * ASCII PPM output added by Brian Paul.
  17  */
  18
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include "GL/osmesa.h"
  23 #include "GL/glut.h"
  24
  25
  26 #define SAVE_TARGA
  27
  28
  29 #define WIDTH 400
  30 #define HEIGHT 400
  31
  32
  33
  34 static void render_image( void )
  35 {
  36    GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
  37    GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
  38    GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  39    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
  40    GLfloat red_mat[]   = { 1.0, 0.2, 0.2, 1.0 };
  41    GLfloat green_mat[] = { 0.2, 1.0, 0.2, 0.5 };
  42    GLfloat blue_mat[]  = { 0.2, 0.2, 1.0, 1.0 };
  43    GLfloat white_mat[]  = { 1.0, 1.0, 1.0, 1.0 };
  44    GLfloat purple_mat[] = { 1.0, 0.2, 1.0, 1.0 };
  45    GLUquadricObj *qobj = gluNewQuadric();
  46
  47    glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
  48    glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
  49    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
  50    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  51
  52    glEnable(GL_LIGHTING);
  53    glEnable(GL_LIGHT0);
  54    glEnable(GL_DEPTH_TEST);
  55
  56    glMatrixMode(GL_PROJECTION);
  57    glLoadIdentity();
  58    glOrtho(-2.5, 2.5, -2.5, 2.5, -10.0, 10.0);
  59    glMatrixMode(GL_MODELVIEW);
  60
  61    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  62
  63    glPushMatrix();
  64    glRotatef(20.0, 1.0, 0.0, 0.0);
  65
  66 #if 0
  67    glPushMatrix();
  68    glTranslatef(-0.75, 0.5, 0.0);
  69    glRotatef(90.0, 1.0, 0.0, 0.0);
  70    glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red_mat );
  71    glutSolidTorus(0.275, 0.85, 20, 20);
  72    glPopMatrix();
  73 #endif
  74
  75    /* red square */
  76    glPushMatrix();
  77    glTranslatef(0.0, -0.5, 0.0);
  78    glRotatef(90, 1, 0.5, 0);
  79    glScalef(3, 3, 3);
  80    glDisable(GL_LIGHTING);
  81    glColor4f(1, 0, 0, 0.5);
  82    glBegin(GL_POLYGON);
  83    glVertex2f(-1, -1);
  84    glVertex2f( 1, -1);
  85    glVertex2f( 1,  1);
  86    glVertex2f(-1,  1);
  87    glEnd();
  88    glEnable(GL_LIGHTING);
  89    glPopMatrix();
  90
  91 #if 0
  92    /* green square */
  93    glPushMatrix();
  94    glTranslatef(0.0, 0.5, 0.1);
  95    glDisable(GL_LIGHTING);
  96    glColor3f(0, 1, 0);
  97    glBegin(GL_POLYGON);
  98    glVertex2f(-1, -1);
  99    glVertex2f( 1, -1);
 100    glVertex2f( 1,  1);
 101    glVertex2f(-1,  1);
 102    glEnd();
 103    glEnable(GL_LIGHTING);
 104    glPopMatrix();
 105
 106    /* blue square */
 107    glPushMatrix();
 108    glTranslatef(0.75, 0.5, 0.3);
 109    glDisable(GL_LIGHTING);
 110    glColor3f(0, 0, 0.5);
 111    glBegin(GL_POLYGON);
 112    glVertex2f(-1, -1);
 113    glVertex2f( 1, -1);
 114    glVertex2f( 1,  1);
 115    glVertex2f(-1,  1);
 116    glEnd();
 117    glEnable(GL_LIGHTING);
 118    glPopMatrix();
 119 #endif
 120    glPushMatrix();
 121    glTranslatef(-0.75, -0.5, 0.0);
 122    glRotatef(270.0, 1.0, 0.0, 0.0);
 123    glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green_mat );
 124    glColor4f(0,1,0,0.5);
 125    glEnable(GL_BLEND);
 126    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 127    gluCylinder(qobj, 1.0, 0.0, 2.0, 16, 1);
 128    glDisable(GL_BLEND);
 129    glPopMatrix();
 130
 131    glPushMatrix();
 132    glTranslatef(0.75, 1.0, 1.0);
 133    glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
 134    gluSphere(qobj, 1.0, 20, 20);
 135    glPopMatrix();
 136
 137    glPopMatrix();
 138
 139    gluDeleteQuadric(qobj);
 140
 141    {
 142       GLint r, g, b, a;
 143       glGetIntegerv(GL_RED_BITS, &r);
 144       glGetIntegerv(GL_GREEN_BITS, &g);
 145       glGetIntegerv(GL_BLUE_BITS, &b);
 146       glGetIntegerv(GL_ALPHA_BITS, &a);
 147       printf("channel sizes: %d %d %d %d\n", r, g, b, a);
 148    }
 149 }
 150
 151
 152
 153 static void
 154 write_targa(const char *filename, const GLushort *buffer, int width, int height)
 155 {
 156    FILE *f = fopen( filename, "w" );
 157    if (f) {
 158       int i, x, y;
 159       const GLushort *ptr = buffer;
 160       printf ("osdemo, writing tga file \n");
 161       fputc (0x00, f);  /* ID Length, 0 => No ID        */
 162       fputc (0x00, f);  /* Color Map Type, 0 => No color map included   */
 163       fputc (0x02, f);  /* Image Type, 2 => Uncompressed, True-color Image */
 164       fputc (0x00, f);  /* Next five bytes are about the color map entries */
 165       fputc (0x00, f);  /* 2 bytes Index, 2 bytes length, 1 byte size */
 166       fputc (0x00, f);
 167       fputc (0x00, f);
 168       fputc (0x00, f);
 169       fputc (0x00, f);  /* X-origin of Image    */
 170       fputc (0x00, f);
 171       fputc (0x00, f);  /* Y-origin of Image    */
 172       fputc (0x00, f);
 173       fputc (WIDTH & 0xff, f);      /* Image Width      */
 174       fputc ((WIDTH>>8) & 0xff, f);
 175       fputc (HEIGHT & 0xff, f);     /* Image Height     */
 176       fputc ((HEIGHT>>8) & 0xff, f);
 177       fputc (0x18, f);          /* Pixel Depth, 0x18 => 24 Bits */
 178       fputc (0x20, f);          /* Image Descriptor     */
 179       fclose(f);
 180       f = fopen( filename, "ab" );  /* reopen in binary append mode */
 181       for (y=height-1; y>=0; y--) {
 182          for (x=0; x<width; x++) {
 183             i = (y*width + x) * 4;
 184             fputc(ptr[i+2] >> 8, f); /* write blue */
 185             fputc(ptr[i+1] >> 8, f); /* write green */
 186             fputc(ptr[i] >> 8, f);   /* write red */
 187          }
 188       }
 189    }
 190 }
 191
 192
 193 static void
 194 write_ppm(const char *filename, const GLubyte *buffer, int width, int height)
 195 {
 196    const int binary = 0;
 197    FILE *f = fopen( filename, "w" );
 198    if (f) {
 199       int i, x, y;
 200       const GLubyte *ptr = buffer;
 201       if (binary) {
 202          fprintf(f,"P6\n");
 203          fprintf(f,"# ppm-file created by osdemo.c\n");
 204          fprintf(f,"%i %i\n", width,height);
 205          fprintf(f,"255\n");
 206          fclose(f);
 207          f = fopen( filename, "ab" );  /* reopen in binary append mode */
 208          for (y=height-1; y>=0; y--) {
 209             for (x=0; x<width; x++) {
 210                i = (y*width + x) * 4;
 211                fputc(ptr[i], f);   /* write red */
 212                fputc(ptr[i+1], f); /* write green */
 213                fputc(ptr[i+2], f); /* write blue */
 214             }
 215          }
 216       }
 217       else {
 218          /*ASCII*/
 219          int counter = 0;
 220          fprintf(f,"P3\n");
 221          fprintf(f,"# ascii ppm file created by osdemo.c\n");
 222          fprintf(f,"%i %i\n", width, height);
 223          fprintf(f,"255\n");
 224          for (y=height-1; y>=0; y--) {
 225             for (x=0; x<width; x++) {
 226                i = (y*width + x) * 4;
 227                fprintf(f, " %3d %3d %3d", ptr[i], ptr[i+1], ptr[i+2]);
 228                counter++;
 229                if (counter % 5 == 0)
 230                   fprintf(f, "\n");
 231             }
 232          }
 233       }
 234       fclose(f);
 235    }
 236 }
 237
 238
 239
 240 int main( int argc, char *argv[] )
 241 {
 242    void *buffer;
 243
 244    /* Create an RGBA-mode context */
 245 #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
 246    /* specify Z, stencil, accum sizes */
 247    OSMesaContext ctx = OSMesaCreateContextExt( GL_RGBA, 16, 0, 0, NULL );
 248 #else
 249    OSMesaContext ctx = OSMesaCreateContext( GL_RGBA, NULL );
 250 #endif
 251    if (!ctx) {
 252       printf("OSMesaCreateContext failed!\n");
 253       return 0;
 254    }
 255
 256    /* Allocate the image buffer */
 257    buffer = malloc( WIDTH * HEIGHT * 4 * sizeof(GLushort));
 258    if (!buffer) {
 259       printf("Alloc image buffer failed!\n");
 260       return 0;
 261    }
 262
 263    /* Bind the buffer to the context and make it current */
 264    if (!OSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_SHORT, WIDTH, HEIGHT )) {
 265       printf("OSMesaMakeCurrent failed!\n");
 266       return 0;
 267    }
 268
 269    render_image();
 270
 271    if (argc>1) {
 272 #ifdef SAVE_TARGA
 273       write_targa(argv[1], buffer, WIDTH, HEIGHT);
 274 #else
 275       write_ppm(argv[1], buffer, WIDTH, HEIGHT);
 276 #endif
 277    }
 278    else {
 279       printf("Specify a filename if you want to make an image file\n");
 280    }
 281
 282    printf("all done\n");
 283
 284    /* free the image buffer */
 285    free( buffer );
 286
 287    /* destroy the context */
 288    OSMesaDestroyContext( ctx );
 289
 290    return 0;
 291 }