src/tests/osdemo32.c

   1 /* $Id: osdemo32.c,v 1.1 2003/03/08 19:05:45 brianp Exp $ */
   2
   3 /*
   4  * Test OSMesa with GLfloat color channels.
   5  */
   6
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include "GL/osmesa.h"
  11 #include "GL/glut.h"
  12
  13
  14 #define SAVE_TARGA
  15
  16
  17 #define WIDTH 400
  18 #define HEIGHT 400
  19
  20
  21
  22 static void render_image( void )
  23 {
  24    GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
  25    GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
  26    GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  27    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
  28    GLfloat red_mat[]   = { 1.0, 0.2, 0.2, 1.0 };
  29    GLfloat green_mat[] = { 0.2, 1.0, 0.2, 0.5 };
  30    GLfloat blue_mat[]  = { 0.2, 0.2, 1.0, 1.0 };
  31    GLfloat white_mat[]  = { 1.0, 1.0, 1.0, 1.0 };
  32    GLfloat purple_mat[] = { 1.0, 0.2, 1.0, 1.0 };
  33    GLUquadricObj *qobj = gluNewQuadric();
  34
  35    glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
  36    glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
  37    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
  38    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  39
  40    glEnable(GL_LIGHTING);
  41    glEnable(GL_LIGHT0);
  42    glEnable(GL_DEPTH_TEST);
  43
  44    glMatrixMode(GL_PROJECTION);
  45    glLoadIdentity();
  46    glOrtho(-2.5, 2.5, -2.5, 2.5, -10.0, 10.0);
  47    glMatrixMode(GL_MODELVIEW);
  48
  49    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  50
  51    glPushMatrix();
  52    glRotatef(20.0, 1.0, 0.0, 0.0);
  53
  54 #if 0
  55    glPushMatrix();
  56    glTranslatef(-0.75, 0.5, 0.0);
  57    glRotatef(90.0, 1.0, 0.0, 0.0);
  58    glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red_mat );
  59    glutSolidTorus(0.275, 0.85, 20, 20);
  60    glPopMatrix();
  61 #endif
  62
  63    /* red square */
  64    glPushMatrix();
  65    glTranslatef(0.0, -0.5, 0.0);
  66    glRotatef(90, 1, 0.5, 0);
  67    glScalef(3, 3, 3);
  68    glDisable(GL_LIGHTING);
  69    glColor4f(1, 0, 0, 0.5);
  70    glBegin(GL_POLYGON);
  71    glVertex2f(-1, -1);
  72    glVertex2f( 1, -1);
  73    glVertex2f( 1,  1);
  74    glVertex2f(-1,  1);
  75    glEnd();
  76    glEnable(GL_LIGHTING);
  77    glPopMatrix();
  78
  79 #if 0
  80    /* green square */
  81    glPushMatrix();
  82    glTranslatef(0.0, 0.5, 0.1);
  83    glDisable(GL_LIGHTING);
  84    glColor3f(0, 1, 0);
  85    glBegin(GL_POLYGON);
  86    glVertex2f(-1, -1);
  87    glVertex2f( 1, -1);
  88    glVertex2f( 1,  1);
  89    glVertex2f(-1,  1);
  90    glEnd();
  91    glEnable(GL_LIGHTING);
  92    glPopMatrix();
  93
  94    /* blue square */
  95    glPushMatrix();
  96    glTranslatef(0.75, 0.5, 0.3);
  97    glDisable(GL_LIGHTING);
  98    glColor3f(0, 0, 0.5);
  99    glBegin(GL_POLYGON);
 100    glVertex2f(-1, -1);
 101    glVertex2f( 1, -1);
 102    glVertex2f( 1,  1);
 103    glVertex2f(-1,  1);
 104    glEnd();
 105    glEnable(GL_LIGHTING);
 106    glPopMatrix();
 107 #endif
 108    glPushMatrix();
 109    glTranslatef(-0.75, -0.5, 0.0);
 110    glRotatef(270.0, 1.0, 0.0, 0.0);
 111    glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green_mat );
 112    glColor4f(0,1,0,0.5);
 113    glEnable(GL_BLEND);
 114    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 115    gluCylinder(qobj, 1.0, 0.0, 2.0, 16, 1);
 116    glDisable(GL_BLEND);
 117    glPopMatrix();
 118
 119    glPushMatrix();
 120    glTranslatef(0.75, 1.0, 1.0);
 121    glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
 122    gluSphere(qobj, 1.0, 20, 20);
 123    glPopMatrix();
 124
 125    glPopMatrix();
 126
 127    gluDeleteQuadric(qobj);
 128
 129    {
 130       GLint r, g, b, a;
 131       glGetIntegerv(GL_RED_BITS, &r);
 132       glGetIntegerv(GL_GREEN_BITS, &g);
 133       glGetIntegerv(GL_BLUE_BITS, &b);
 134       glGetIntegerv(GL_ALPHA_BITS, &a);
 135       printf("channel sizes: %d %d %d %d\n", r, g, b, a);
 136    }
 137 }
 138
 139
 140
 141 static void
 142 write_targa(const char *filename, const GLfloat *buffer, int width, int height)
 143 {
 144    FILE *f = fopen( filename, "w" );
 145    if (f) {
 146       int i, x, y;
 147       const GLfloat *ptr = buffer;
 148       printf ("osdemo, writing tga file \n");
 149       fputc (0x00, f);  /* ID Length, 0 => No ID        */
 150       fputc (0x00, f);  /* Color Map Type, 0 => No color map included   */
 151       fputc (0x02, f);  /* Image Type, 2 => Uncompressed, True-color Image */
 152       fputc (0x00, f);  /* Next five bytes are about the color map entries */
 153       fputc (0x00, f);  /* 2 bytes Index, 2 bytes length, 1 byte size */
 154       fputc (0x00, f);
 155       fputc (0x00, f);
 156       fputc (0x00, f);
 157       fputc (0x00, f);  /* X-origin of Image    */
 158       fputc (0x00, f);
 159       fputc (0x00, f);  /* Y-origin of Image    */
 160       fputc (0x00, f);
 161       fputc (WIDTH & 0xff, f);      /* Image Width      */
 162       fputc ((WIDTH>>8) & 0xff, f);
 163       fputc (HEIGHT & 0xff, f);     /* Image Height     */
 164       fputc ((HEIGHT>>8) & 0xff, f);
 165       fputc (0x18, f);          /* Pixel Depth, 0x18 => 24 Bits */
 166       fputc (0x20, f);          /* Image Descriptor     */
 167       fclose(f);
 168       f = fopen( filename, "ab" );  /* reopen in binary append mode */
 169       for (y=height-1; y>=0; y--) {
 170          for (x=0; x<width; x++) {
 171             int r, g, b;
 172             i = (y*width + x) * 4;
 173             r = (int) (ptr[i+0] * 255.0);
 174             g = (int) (ptr[i+1] * 255.0);
 175             b = (int) (ptr[i+2] * 255.0);
 176             if (r > 255) r = 255;
 177             if (g > 255) g = 255;
 178             if (b > 255) b = 255;
 179             fputc(b, f); /* write blue */
 180             fputc(g, f); /* write green */
 181             fputc(r, f); /* write red */
 182          }
 183       }
 184    }
 185 }
 186
 187
 188 static void
 189 write_ppm(const char *filename, const GLubyte *buffer, int width, int height)
 190 {
 191    const int binary = 0;
 192    FILE *f = fopen( filename, "w" );
 193    if (f) {
 194       int i, x, y;
 195       const GLubyte *ptr = buffer;
 196       if (binary) {
 197          fprintf(f,"P6\n");
 198          fprintf(f,"# ppm-file created by osdemo.c\n");
 199          fprintf(f,"%i %i\n", width,height);
 200          fprintf(f,"255\n");
 201          fclose(f);
 202          f = fopen( filename, "ab" );  /* reopen in binary append mode */
 203          for (y=height-1; y>=0; y--) {
 204             for (x=0; x<width; x++) {
 205                i = (y*width + x) * 4;
 206                fputc(ptr[i], f);   /* write red */
 207                fputc(ptr[i+1], f); /* write green */
 208                fputc(ptr[i+2], f); /* write blue */
 209             }
 210          }
 211       }
 212       else {
 213          /*ASCII*/
 214          int counter = 0;
 215          fprintf(f,"P3\n");
 216          fprintf(f,"# ascii ppm file created by osdemo.c\n");
 217          fprintf(f,"%i %i\n", width, height);
 218          fprintf(f,"255\n");
 219          for (y=height-1; y>=0; y--) {
 220             for (x=0; x<width; x++) {
 221                i = (y*width + x) * 4;
 222                fprintf(f, " %3d %3d %3d", ptr[i], ptr[i+1], ptr[i+2]);
 223                counter++;
 224                if (counter % 5 == 0)
 225                   fprintf(f, "\n");
 226             }
 227          }
 228       }
 229       fclose(f);
 230    }
 231 }
 232
 233
 234
 235 int main( int argc, char *argv[] )
 236 {
 237    void *buffer;
 238
 239    /* Create an RGBA-mode context */
 240 #if OSMESA_MAJOR_VERSION * 100 + OSMESA_MINOR_VERSION >= 305
 241    /* specify Z, stencil, accum sizes */
 242    OSMesaContext ctx = OSMesaCreateContextExt( GL_RGBA, 16, 0, 0, NULL );
 243 #else
 244    OSMesaContext ctx = OSMesaCreateContext( GL_RGBA, NULL );
 245 #endif
 246    if (!ctx) {
 247       printf("OSMesaCreateContext failed!\n");
 248       return 0;
 249    }
 250
 251    /* Allocate the image buffer */
 252    buffer = malloc( WIDTH * HEIGHT * 4 * sizeof(GLfloat));
 253    if (!buffer) {
 254       printf("Alloc image buffer failed!\n");
 255       return 0;
 256    }
 257
 258    /* Bind the buffer to the context and make it current */
 259    if (!OSMesaMakeCurrent( ctx, buffer, GL_FLOAT, WIDTH, HEIGHT )) {
 260       printf("OSMesaMakeCurrent failed!\n");
 261       return 0;
 262    }
 263
 264    render_image();
 265
 266    if (argc>1) {
 267 #ifdef SAVE_TARGA
 268       write_targa(argv[1], buffer, WIDTH, HEIGHT);
 269 #else
 270       write_ppm(argv[1], buffer, WIDTH, HEIGHT);
 271 #endif
 272    }
 273    else {
 274       printf("Specify a filename if you want to make an image file\n");
 275    }
 276
 277    printf("all done\n");
 278
 279    /* free the image buffer */
 280    free( buffer );
 281
 282    /* destroy the context */
 283    OSMesaDestroyContext( ctx );
 284
 285    return 0;
 286 }