1 #include <stdio.h>

2 #include <ctype.h>

3 #include <GL/gl.h>

4 #include "sgl.h"

5

6 void disp(void);

7 void reshape(int x, int y);

8 void keyb(int key, int state);

9 void mouse(int bn, int state, int x, int y);

10 void motion(int x, int y);

11

12

13 int main(void)

14 {

15 if(sgl_init() == -1) {

16 return 1;

17 }

18

19 sgl_create_window(640, 480, SGL_DOUBLE | SGL_DEPTH);

20

21 sgl_set_callback(SGL_DISPLAY, disp);

22 sgl_set_callback(SGL_RESHAPE, reshape);

23 sgl_set_callback(SGL_KEYBOARD, keyb);

24 sgl_set_callback(SGL_MOUSE, mouse);

25 sgl_set_callback(SGL_MOTION, motion);

26

27 sgl_event_loop();

28 sgl_quit();

29 return 0;

30 }

31

32

33 void disp(void)

34 {

35 printf("redisplay\n");

36

37 glClearColor(0.2, 0.2, 0.2, 1);

38 glClear(GL_COLOR_BUFFER_BIT);

39

40 glBegin(GL_QUADS);

41 glColor3f(1, 0, 0);

42 glVertex2f(-1, -1);

43 glColor3f(0, 1, 0);

44 glVertex2f(1, -1);

45 glColor3f(0, 0, 1);

46 glVertex2f(1, 1);

47 glColor3f(1, 1, 0);

48 glVertex2f(-1, 1);

49 glEnd();

50

51 sgl_swap_buffers();

52 }

53

54 void reshape(int x, int y)

55 {

56 printf("reshape: %dx%d\n", x, y);

57 glViewport(0, 0, x, y);

58 }

59

60 void keyb(int key, int state)

61 {

62 char *ststr = state ? "pressed" : "released";

63

64 if(key < 0xff && isprint(key)) {

65 printf("keyboard: '%c' %s\n", (char)key, ststr);

66 } else {

67 printf("keyboard: %x %s\n", key, ststr);

68 }

69

70 if(key == 27) {

71 sgl_quit();

72 }

73 }

74

75 void mouse(int bn, int state, int x, int y)

76 {

77 printf("mouse: button%d %s (ptr: %d %d)\n", bn, state ? "pressed" : "released", x, y);

78 }

79

80 void motion(int x, int y)

81 {

82 printf("mouse dragged to: (%d %d)\n", x, y);

83 }