Freeglut, rather than glut

1. freeglut adds the glumainloopevent and gluleavemainloop. You can hand over control after mainloop starts. 2. You Can Customize multiple forms by using the maid ProgramThe behavior when the form is closed (the default is exit like GLUT ). 3. new callback: Common and special button release callback, joystick callback, menu status callback (one parameter, different from the three parameters), window status callback (also a parameter) scroll wheel callback 4. function Group for string rendering. Render the complete string at a time instead of a single character at a time. In most cases, the length and width of the characters are returned. 5. Two 12-dimensional functions, One dashed line and one fill. 6. The glxgetprocaddress package glxgetprocaddressarb and wglgetprocaddress