- glViewport(0, 0, width, (GLint) height);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- /*glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0); */
- gluPerspective(65.0, (GLfloat) width / (GLfloat) height, 0.1, 20.0);
- glMatrixMode(GL_MODELVIEW);
+ double h = (GLfloat) height / (GLfloat) width;
+ int y = 0;
+
+ if (width > height * 5) { /* tiny window: show middle */
+ height = width * 9/16;
+ y = -height/2;
+ h = height / (GLfloat) width;
+ }
+ glViewport(0, y, width, (GLint) height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ /*glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0); */
+ gluPerspective(65.0, 1/h, 0.1, 20.0);
+ glMatrixMode(GL_MODELVIEW);