Functions API useful in the OpenGL/GLUT

Talking

Các API sử dụng trong OpenGL/GLUT


Thấy anh em Cviệt rủ nhau cái vụ này và cu Kim nó chịu khó quá
X hơi rảnh tí thu gom một tí API cho anh em tham khảo.

OpenGL/GLUT API

Cac API su dung trong OpenGL
============================

1. Khoi tao chuong trinh dung GLUT
void glutInit(int *argc, char **argv);
Tham so: argc va argv truyen vao tu ham ‘main()’

2. Thiet lap vi tri cua so
void glutInitWindowPosition(int x, int y)
Tham so: toa do cua so tu goc trai tren cung

3. Thiet lap kich thuoc cua so
void glutInitWindowSize(int width, int height)
Tham so:
width – chieu rong cua so
height – chieu dai cua so

4. Thiet lap che do man hinh
void glutInitDisplayMode(int mode)
Tham so:
mode – che do man hinh
Cac kieu che do mode duoc dinh nghia san
a. Che do mau sac
GLUT_RGBA (mac dinh)
GLUT_RGB
GLUT_INDEX
b. Che do rai (buffer mode)
GLUT_SINGLE
GLUT_DOUBLE
c. Che do cac kieu rai
GLUT_ACCUM
GLUT_STENCIL
GLUT_DEPTH

De su dung ket hop cac che do voi nhau, su dung toan tu bitwise OR (|).
Vi du: glutInitDisplayMode( GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA );
tuc la thiet lap man hinh che so sau kieu rai kep o che do RGBA

5. Thiet lap cua so
void glutCreateWindow(char* title)
Tham so:
title – tieu de cua cua so

6. Quy dinh ham xu ly ve man hinh (rendering)
void glutDisplayFunc(void (*func)(void))
Tham so:
(*func)() – con tro toi ham xu ly render
Chu y: bat buoc phai co, khong duoc truyen vao tham so NULL (gay ra crash)

7. Giu chuong trinh chay lien tuc
void glutMainLoop()

8. Ham xu ly khi cua so bi thay doi
void glutReshapeFunc(void (*func)(void))
Tham so:
(*func)() – con tro toi ham xu ly cua so

9. Ham xu ly khi cua so o che do tinh (Idle)
void glutIdleFunc(void (*func)(void))
Tham so:
(*func)() – con tro toi ham xu ly

10. Ham goi trinh xu ly rai doi (double buffering)
void glutSwapBuffers();

11. Ham xu ly tu ban phim voi cac ki tu nhan biet duoc duoi ma ASCII
void glutKeyboardFunc(void (*func) (unsigned char key, int x, int y))
Tham so
(*func)(unsigned char key, int x, int y) – con tro toi ham xu ly
key – ki tu vao
x – toa do x cua chuot (hoanh do)
y – toa do y cua chuot (tung do)

12. Ham xu ly cac ki tu tren ban phim ma nhan biet duoc duoi ma ASCII
void glutSpecialFunc(void (*func)(int key, int x, int y)
Tham so:
tuong tu glutKeyboardFunc() nhung key duoc dinh nghia san la 1 trong so
nhung ma sau:
GLUT_KEY_F1 F1
GLUT_KEY_F2 F2

GLUT_KEY_F12 F12
GLUT_KEY_LEFT Left function key
GLUT_KEY_RIGHT Up function key
GLUT_KEY_UP Right function key
GLUT_KEY_DOWN Down function key
GLUT_KEY_PAGE_UP Page Up function key
GLUT_KEY_PAGE_DOWN Page Down function key
GLUT_KEY_HOME Home function key
GLUT_KEY_END End function key
GLUT_KEY_INSERT Insert function key

13. Ham xu li cac ki tu tren ban phim duoi dang to hop (combination keys)
int glutGetModifiers();
Gia tri tra ve la 1 trong 3 phim duoc dinh nghia san
GLUT_ACTIVE_SHIFT
GLUT_ACTIVE_CTRL
GLUT_ACTIVE_ALT

14. Thiet lap che do lap di lap lai cho ban phim (repeat key mode)
int glutSetKeyRepeat(int repeatMode)
Tham so:
repeatMode – duoc dinh nghia san voi 3 che do sau
GLUT_KEY_REPEAT_OFF
GLUT_KEY_REPEAT_ON
GLUT_KEY_REPEAT_DEFAULT

15. Mot ham khac tuong tu glutSetKeyRepeat() va an toan hon
int glutIgnoreKeyRepeat(int repeatMode)
Tham so
repeatMode – duoc dinh nghia voi 2 gia tri
1 – tu dong lap (auto-repeat)
0 – dung qua trinh lap (non-repeat)

16. Ham kiem tra neu phim thuong duoc nha ra (key release)
void glutKeyboardUpFunc(void (*func)(unsigned char key, int x, int y))

17. Tuong tu glutKeyboardUpFunc() nhung voi cac phim dac biet
void glutSpecialUpFunc(void (*func)(int key, int x, int y))

18. Ham xu ly su kien chuot
void glutMouseFunc(void (*func)(int button, int state, int x, int y))
Tham so:
(*func)(int button, int state, int x, int y) – con tro toi ham xu ly chuot
button – nut chuot duoc an, duoc dinh nghia voi 3 kieu sau
GLUT_LEFT_BUTTON
GLUT_RIGHT_BUTTON
GLUT_MIDDLE_BUTTON
state – trang thai nut chuot duoc dinh nghia voi 2 kieu
GLUT_DOWN
GLUT_UP
x – hoanh do cua chuot
y – tung do cua chuot

19. Ham xu ly chuyen dong chuot o trang thai dong va trang thai tinh
void glutMotionFunc(void (*func)(int x, int y))
void glutPassiveMotionFunc(void (*func)(int x, int y))

20. Ham kiem tra hanh vi chuot vao cua so hay roi cua so
void glutEntryFunc(void (*func)(int state))
Tham so:
(*func)(int state) – con tro xu ly trang thai chuot
state – trang thai chuot so voi cua so, duoc dinh nghia voi 2 kieu
GLUT_LEFT
GLUT_ENTERED

21. Tao menu
int glutCreateMenu(void (*func)(int value))
Tham so:
(*func)(int value) – con tro toi ham xu ly su kien tao menu

22. Them mot item vao menu
void glutAddMenuEntry(char* name, int value)
Tham so:
name – ten menu
value – gia tri thiet lap de su dung khi goi

23. Gan menu vao nut chuot
void glutAttachMenu(int button)
Tham so:
button – nut chuot duoc gan menu vao, duoc dinh nghia voi 3 kieu nut o tren

24. Go menu ra khoi nut
void glutDetachMenu(int button)
tuong tu glutAttachMenu()

25. Xoa menu di
void glutDestroyMenu(int menuIdentifier)
Tham so:
menuIdentifier – id cua menu khi tao qua glutCreateMenu()

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72 Responses to Functions API useful in the OpenGL/GLUT

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