main(int argc, char *argv[])
{
static GLfloat imageFilter[256];
int i;
glutInit(&argc, argv);
glutInitWindowSize(winWidth, winHeight);
if(argc > 1)
{
char *args = argv[1];
GLboolean done = GL_FALSE;
while(!done)
{
switch(*args)
{
case 's': /* single buffer */
printf("Single Buffered\n");
dblbuf = GL_FALSE;
break;
case '-': /* do nothing */
break;
case 0:
done = GL_TRUE;
break;
}
args++;
}
}
if(dblbuf)
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
else
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH);
(void)glutCreateWindow("volume rendering demo");
glutDisplayFunc(redrawVolumeInit);
glutReshapeFunc(reshape);
glutMouseFunc(mouse);
glutMotionFunc(motion);
createMenu();
glutKeyboardFunc(key);
ext_blend_color = glutExtensionSupported("GL_EXT_blend_color");
ext_texture3D = glutExtensionSupported("GL_EXT_texture3D");
/* Initialize OpenGL State */
if (!ext_texture3D) {
printf("EXT_texture3D not supported\n");
exit(1);
}
textureEnable = dummy;
textureDisable = dummy;
tex3ddata = loadtex3d(&texwid, &texht, &texdepth, &texcomps);
#ifdef GL_EXT_texture3D
glTexParameteri(GL_TEXTURE_3D_EXT, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_3D_EXT, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_3D_EXT, GL_TEXTURE_WRAP_R_EXT, GL_REPEAT);
glTexParameteri(GL_TEXTURE_3D_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_3D_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
#endif
key('p', 0, 0); //start in preview mode
CHECK_ERROR("end of main");
glutMainLoop();
return 0;
}
main(int argc, char *argv[])
{
int texcomps;
static GLfloat splane[4] = {1.f/200.f, 0.f, 0.f, .5f};
static GLfloat rplane[4] = {0, 1.f/200.f, 0, .5f};
static GLfloat tplane[4] = {0, 0, 1.f/200.f, .5f};
static GLfloat lightpos[4] = {150., 150., 150., 1.f};
glutInit(&argc, argv);
glutInitWindowSize(winWidth, winHeight);
if(argc > 1)
{
char *args = argv[1];
GLboolean done = GL_FALSE;
while(!done)
{
switch(*args)
{
case 's': /* single buffer */
printf("Single Buffered\n");
dblbuf = GL_FALSE;
break;
case '-': /* do nothing */
break;
case 0:
done = GL_TRUE;
break;
}
args++;
}
}
if(dblbuf)
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
else
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH);
(void)glutCreateWindow("volume rendering demo");
glutDisplayFunc(redraw);
glutReshapeFunc(reshape);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutKeyboardFunc(key);
/* Initialize OpenGL State */
/* draw a perspective scene */
#if 0
glMatrixMode(GL_PROJECTION);
/* cube, 300 on a side */
glFrustum(-150., 150., -150., 150., 300., 600.);
glMatrixMode(GL_MODELVIEW);
/* look at scene from (0, 0, 450) */
gluLookAt(0., 0., 450., 0., 0., 0., 0., 1., 0.);
#else
glMatrixMode(GL_PROJECTION);
/* cube, 300 on a side */
glOrtho(-150., 150., -150., 150., -150., 150.);
glMatrixMode(GL_MODELVIEW);
#endif
glEnable(GL_DEPTH_TEST);
#ifdef GL_EXT_texture3D
glEnable(GL_TEXTURE_3D_EXT);
#endif
glEnable(GL_TEXTURE_GEN_S);
glEnable(GL_TEXTURE_GEN_T);
glEnable(GL_TEXTURE_GEN_R);
glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
glTexGeni(GL_R, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);
glTexGenfv(GL_S, GL_OBJECT_PLANE, splane);
glTexGenfv(GL_T, GL_OBJECT_PLANE, tplane);
glTexGenfv(GL_R, GL_OBJECT_PLANE, rplane);
#ifdef GL_EXT_texture3D
/* to avoid boundary problems */
glTexParameteri(GL_TEXTURE_3D_EXT, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_3D_EXT, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_3D_EXT, GL_TEXTURE_WRAP_R_EXT, GL_CLAMP);
#endif
glEnable(GL_CLIP_PLANE0);
glEnable(GL_CLIP_PLANE1);
glEnable(GL_CLIP_PLANE2);
glEnable(GL_CLIP_PLANE3);
glEnable(GL_CLIP_PLANE4);
glEnable(GL_CLIP_PLANE5);
glDisable(GL_LIGHT0);
glLightfv(GL_LIGHT0, GL_POSITION, lightpos);
tex3ddata = loadtex3d(&texwid, &texht, &texdepth, &texcomps);
slices = texht;
#ifdef GL_EXT_texture3D
glTexParameteri(GL_TEXTURE_3D_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage3DEXT(GL_TEXTURE_3D_EXT, 0, GL_LUMINANCE_ALPHA,
texwid, texht, texdepth,
0,
GL_RGBA, GL_UNSIGNED_BYTE, tex3ddata);
#endif
/* make a display list containing a sphere */
glNewList(SPHERE, GL_COMPILE);
{
static GLfloat lightpos[] = {150.f, 150.f, 150.f, 1.f};
static GLfloat material[] = {1.f, .5f, 1.f, 1.f};
GLUquadricObj *qobj = gluNewQuadric();
glPushAttrib(GL_LIGHTING_BIT);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glLightfv(GL_LIGHT0, GL_POSITION, lightpos);
glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, material);
gluSphere(qobj, 20.f, 20, 20);
gluDeleteQuadric(qobj);
glPopAttrib();
}
glEndList();
key('?', 0, 0); /* print usage message */
CHECK_ERROR("end of main");
if(!glutExtensionSupported("GL_EXT_texture3d")) {
fprintf(stderr,
"volume: requires OpenGL texture 3D extension to operate correctly.\n");
}
hasBlendColor = glutExtensionSupported("GL_EXT_blend_color");
if(!hasBlendColor) {
fprintf(stderr,
"volume: needs OpenGL blend color extension to attenuate.\n");
}
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
