1. Basic Program with OpenGL and GLUT

2. Outline Development Environment What is GLUT? Set up a GLUT Project
Overview of GLUT Programs
A Basic Program Example
Some GLUT Functions
API Documentation

3. Development EnvironmentOS
IDE
Library
Windows 10
Windows 8
Windows 7
GLUT
(includes OpenGL and GLU)
Visual Studio 2013 Community version
系計中為win7 + visual studio 2013

4. What is GLUT? (1 / 2) OpenGL Utility Toolkit (GLUT)
Window system independent toolkit
Simple windowing API for OpenGL
Functions start with a prefix of “glut”
(e.g., glutInit, glutMainLoop)

5. What is GLUT? (2 / 2) What can GLUT do?
Initializing and creating window
Handling window and input events
Drawing preset 3D objects
Running the program

6. Set up a GLUT Project (1 / 9)
include
lib
dll
glut.h
gl.h (glut.h)
glu.h (glut.h)
glut32.lib
glut32.dll

7. Set up a GLUT Project (2 / 9)

8. Set up a GLUT Project (3 / 9)

9. Set up a GLUT Project (4 / 9)

10. Set up a GLUT Project (5 / 9)

11. Set up a GLUT Project (6 / 9)

12. Set up a GLUT Project (7 / 9)

13. Set up a GLUT Project (8 / 9)
把實際需要使用的library列出

14. Set up a GLUT Project (9 / 9)

15. Overview of GLUT Programs
Point to
Call
Callback
functions
Initialization
Set function pointers
while(true){
if(funcBool){
funcBool = false;
(*funcPtr)(…); }
Main loop

16. A Basic Program Example (1 / 3)

17. A Basic Program Example (2 / 3)

18. A Basic Program Example (3 / 3)

19. Some GLUT Functions This section includes the following:
Initialization and window
Callback Registration
Geometric Object Rendering
Beginning Event Processing

20. Initialization and Window (1 / 3)
void glutInit(int *argcp, char **argv);
Initializing the GLUT library
Should be called before any GLUT functions
void glutInitDisplayMode(unsigned int mode);
Specify a display mode for windows created
Color: GLUT_RGBA, GLUT_RGB or GLUT_INDEX
Framebuffer: GLUT_SINGLE or GLUT_DOUBLE
Buffer: GLUT_DEPTH, GLUT_STENCIL and GLUT_ACCUM

21. Initialization and Window (2 / 3)
void glutInitWindowSize(int width, int height);
Set the initial window size
void glutInitWindowPosition(int x, int y);
Set the initial window position
The actual position is left to the window system to determine
int glutCreateWindow(char *name);
Create and open a window with previous settings

22. Initialization and Window (3 / 3)
void glutPostRedisplay(void);
Mark the current window as needing to be redisplayed
The window‘s display callback will be called
void glutSwapBuffers(void);
Swap the buffers of the current window if double buffered
An implicit glFlush is done by glutSwapBuffers

23. Callback Registration (1 / 5)
void glutDisplayFunc(void (*func)(void));
Put whatever you want to render in the callback
The callback is called when the window need to be redisplayed
Call glutPostRedisplay() to trigger the callback
void glutReshapeFunc(void (*func)(int width, int height));
The callback is called when a window is created, resized or moved
Always call glViewport() to resize your viewport

24. Callback Registration (2 / 5)
void glutKeyboardFunc(void (*func)(unsigned char key, int x, int y));
Each key press generating a keyboard callback
key: The ASCII character generated by the pressed key
x and y: The mouse location in window relative coordinates when the key was pressed

25. Callback Registration (3 / 5)
void glutMouseFunc(void (*func)(int button, int state,
int x, int y));
Each press and each release mouse button in a window generates a mouse callback
button: GLUT_LEFT_BUTTON, GLUT_MIDDLE_BUTTON or GLUT_RIGHT_BUTTON
state: GLUT_UP or GLUT_DOWN
x and y: The mouse location in window relative coordinates when the mouse button state changed

26. Callback Registration (4 / 5)
void glutMotionFunc(void (*func)(int x, int y));
The callback is called when the mouse moves within the window while any mouse buttons are pressed
x and y: the mouse location in window relative coordinates
void glutPassiveMotionFunc(void (*func)(int x, int y));
The callback is called when the mouse moves within the window while no mouse buttons are pressed

27. Callback Registration (5 / 5)
void glutIdleFunc(void (*func)(void));
Perform background processing tasks or continuous animation when window system events are not being received
The idle callback is continuously called when events are not being received

28. Geometric Object Rendering
Provide many objects such as sphere, cube, cone, torus
All objects have wireframe and solid versions
void glutSolidCube(GLdouble size);
void glutWireTeapot(GLdouble size);

29. Beginning Event Processing
void glutMainLoop(void);
Enter the GLUT event processing loop
Once called, this routine will never return
while(true){
if(funcBool){
funcBool = false;
(*funcPtr)(…); }
Call
Callback
functions

30. API Documentation (1 / 2) OpenGL 2.1 Reference Pages OpenGL and GLU
This course use legacy OpenGL (1.0 – 2.1)

31. API Documentation (2 / 2)
GLUT API Version 3
For GLUT 3.x

32. Thanks for listening!
Any questions?