progs/demos/osdemo.c

   1 /* $Id: osdemo.c,v 1.2 2000/01/15 06:11:33 rjfrank 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 /*
  21  * $Log: osdemo.c,v $
  22  * Revision 1.2  2000/01/15 06:11:33  rjfrank
  23  * Added test for the occlusion test code.
  24  *
  25  * Revision 1.1.1.1  1999/08/19 00:55:40  jtg
  26  * Imported sources
  27  *
  28  * Revision 3.0  1998/02/14 18:42:29  brianp
  29  * initial rev
  30  *
  31  */
  32
  33
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include "GL/osmesa.h"
  38 #include "GL/glut.h"
  39
  40
  41
  42 #define WIDTH 400
  43 #define HEIGHT 400
  44
  45
  46
  47 static void render_image( void )
  48 {
  49    GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
  50    GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
  51    GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  52    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
  53    GLfloat red_mat[]   = { 1.0, 0.2, 0.2, 1.0 };
  54    GLfloat green_mat[] = { 0.2, 1.0, 0.2, 1.0 };
  55    GLfloat blue_mat[]  = { 0.2, 0.2, 1.0, 1.0 };
  56
  57
  58    glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
  59    glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
  60    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
  61    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  62
  63    glEnable(GL_LIGHTING);
  64    glEnable(GL_LIGHT0);
  65    glEnable(GL_DEPTH_TEST);
  66
  67    glMatrixMode(GL_PROJECTION);
  68    glLoadIdentity();
  69    glOrtho(-2.5, 2.5, -2.5, 2.5, -10.0, 10.0);
  70    glMatrixMode(GL_MODELVIEW);
  71
  72    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  73
  74    glPushMatrix();
  75    glRotatef(20.0, 1.0, 0.0, 0.0);
  76
  77    glPushMatrix();
  78    glTranslatef(-0.75, 0.5, 0.0);
  79    glRotatef(90.0, 1.0, 0.0, 0.0);
  80    glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red_mat );
  81    glutSolidTorus(0.275, 0.85, 20, 20);
  82    glPopMatrix();
  83
  84    glPushMatrix();
  85    glTranslatef(-0.75, -0.5, 0.0);
  86    glRotatef(270.0, 1.0, 0.0, 0.0);
  87    glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green_mat );
  88    glutSolidCone(1.0, 2.0, 16, 1);
  89    glPopMatrix();
  90
  91 #ifdef OSMESA_OCCLUSION_TEST_RESULT_HP
  92    {
  93       GLboolean bRet;
  94       OSMesaGetBooleanv(OSMESA_OCCLUSION_TEST_RESULT_HP,&bRet);
  95       glDepthMask(GL_FALSE);
  96       glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE);
  97
  98       glPushMatrix();
  99       glTranslatef(0.75, 0.0, -1.0);
 100       glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
 101       glutSolidSphere(1.0, 20, 20);
 102       glPopMatrix();
 103
 104       OSMesaGetBooleanv(OSMESA_OCCLUSION_TEST_RESULT_HP,&bRet);
 105       printf("Occlusion test 1 (result should be 1): %d\n",bRet);
 106
 107       glDepthMask(GL_TRUE);
 108       glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_TRUE);
 109    }
 110 #endif
 111
 112    glPushMatrix();
 113    glTranslatef(0.75, 0.0, -1.0);
 114    glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
 115    glutSolidSphere(1.0, 20, 20);
 116    glPopMatrix();
 117
 118 #ifdef OSMESA_OCCLUSION_TEST_RESULT_HP
 119    {
 120       GLboolean bRet;
 121
 122       OSMesaGetBooleanv(OSMESA_OCCLUSION_TEST_RESULT_HP,&bRet);
 123       glDepthMask(GL_FALSE);
 124       glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE);
 125
 126       /* draw a sphere inside the previous sphere */
 127       glPushMatrix();
 128       glTranslatef(0.75, 0.0, -1.0);
 129       glMaterialfv( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat );
 130       glutSolidSphere(0.5, 20, 20);
 131       glPopMatrix();
 132
 133       OSMesaGetBooleanv(OSMESA_OCCLUSION_TEST_RESULT_HP,&bRet);
 134       printf("Occlusion test 2 (result should be 0): %d\n",bRet);
 135
 136       glDepthMask(GL_TRUE);
 137       glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_TRUE);
 138    }
 139 #endif
 140
 141    glPopMatrix();
 142 }
 143
 144
 145
 146 int main( int argc, char *argv[] )
 147 {
 148    OSMesaContext ctx;
 149    void *buffer;
 150
 151    /* Create an RGBA-mode context */
 152    ctx = OSMesaCreateContext( GL_RGBA, NULL );
 153
 154    /* Allocate the image buffer */
 155    buffer = malloc( WIDTH * HEIGHT * 4 );
 156
 157    /* Bind the buffer to the context and make it current */
 158    OSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, WIDTH, HEIGHT );
 159
 160    render_image();
 161
 162    if (argc>1) {
 163       /* write PPM file */
 164       FILE *f = fopen( argv[1], "w" );
 165       if (f) {
 166          int i, x, y;
 167          GLubyte *ptr = (GLubyte *) buffer;
 168 #define BINARY 0
 169 #if BINARY
 170          fprintf(f,"P6\n");
 171          fprintf(f,"# ppm-file created by %s\n",  argv[0]);
 172          fprintf(f,"%i %i\n", WIDTH,HEIGHT);
 173          fprintf(f,"255\n");
 174          fclose(f);
 175          f = fopen( argv[1], "ab" );  /* reopen in binary append mode */
 176          for (y=HEIGHT-1; y>=0; y--) {
 177             for (x=0; x<WIDTH; x++) {
 178                i = (y*WIDTH + x) * 4;
 179                fputc(ptr[i], f);   /* write red */
 180                fputc(ptr[i+1], f); /* write green */
 181                fputc(ptr[i+2], f); /* write blue */
 182             }
 183          }
 184 #else /*ASCII*/
 185          int counter = 0;
 186          fprintf(f,"P3\n");
 187          fprintf(f,"# ascii ppm file created by %s\n", argv[0]);
 188          fprintf(f,"%i %i\n", WIDTH, HEIGHT);
 189          fprintf(f,"255\n");
 190          for (y=HEIGHT-1; y>=0; y--) {
 191             for (x=0; x<WIDTH; x++) {
 192                i = (y*WIDTH + x) * 4;
 193                fprintf(f, " %3d %3d %3d", ptr[i], ptr[i+1], ptr[i+2]);
 194                counter++;
 195                if (counter % 5 == 0)
 196                   fprintf(f, "\n");
 197             }
 198          }
 199 #endif
 200          fclose(f);
 201       }
 202    }
 203    else {
 204       printf("Specify a filename if you want to make a ppm file\n");
 205    }
 206
 207    printf("all done\n");
 208
 209    /* free the image buffer */
 210    free( buffer );
 211
 212    /* destroy the context */
 213    OSMesaDestroyContext( ctx );
 214
 215    return 0;
 216 }