+ glViewport(0, 0, (GLsizei) w, (GLsizei) h); // what's GLsizei? Why is it called inside glViewPort?\r
+ glMatrixMode(GL_PROJECTION); // is it necessary to reset the projection matrix?\r
+ glLoadIdentity();\r
+ if (w <= h) // is this calculation universal, could I use it on another program?\r
+ glOrtho(-5.0, 5.0, -5.0*(GLfloat)h/(GLfloat)w,\r
+ 5.0*(GLfloat)h/(GLfloat)w, -5.0, 5.0);\r
+\r
+ else\r
+ glOrtho(-5.0*(GLfloat)w/(GLfloat)h,\r
+ 5.0*(GLfloat)w/(GLfloat)h, -5.0, 5.0, -5.0, 5.0);\r
+ glMatrixMode(GL_MODELVIEW); // why do I set to GL_MODELVIEW at the end?\r
+ glLoadIdentity(); // why does it get a reset?\r