1 /* Unicode libdrawtext example.

2 *

3 * Important parts are marked with XXX comments.

4 */

5 #include <stdio.h>

6 #include <stdlib.h>

7

8 #ifndef __APPLE__

9 #include <GL/glut.h>

10 #else

11 #include <GLUT/glut.h>

12 #endif

13

14 #include "drawtext.h"

15

16 void disp(void);

17 void reshape(int x, int y);

18 void keyb(unsigned char key, int x, int y);

19

20 /* XXX fonts are represented by the opaque struct dtx_font type, so you

21 * need to create at least one with dtx_open_font (see main).

22 */

23 struct dtx_font *freeserif, *klingon;

24

25 #define FONT_SIZE 24

26

27 int main(int argc, char **argv)

28 {

29 glutInit(&argc, argv);

30 glutInitWindowSize(512, 384);

31 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);

32 glutCreateWindow("libdrawtext example: simple");

33

34 glutDisplayFunc(disp);

35 glutReshapeFunc(reshape);

36 glutKeyboardFunc(keyb);

37

38 /* XXX dtx_open_font opens a font file and returns a pointer to dtx_font */

39 if(!(freeserif = dtx_open_font("serif.ttf", 0))) {

40 return 1;

41 }

42 dtx_prepare_range(freeserif, FONT_SIZE, 0, 256); /* prepare ASCII */

43 dtx_prepare_range(freeserif, FONT_SIZE, 0x0370, 0x0400); /* greek */

44 dtx_prepare_range(freeserif, FONT_SIZE, 0x4e00, 0x9fc0); /* kanji */

45

46 if(!(klingon = dtx_open_font("klingon.ttf", 0))) {

47 return 1;

48 }

49 dtx_prepare_range(klingon, FONT_SIZE, 0xf8d0, 0xf900);

50

51 glutMainLoop();

52 return 0;

53 }

54

55 const char *ascii_text = "Hello world!";

56 const char *greek_text = "\xce\x9a\xce\xbf\xcf\x8d\xcf\x81\xce\xb1\xcf\x83\xce\xb7";

57 const char *kanji_text = "\xe4\xb9\x97\xe4\xba\xac";

58 const char *klingon_text = "\xef\xa3\xa3\xef\xa3\x9d\xef\xa3\x93\xef\xa3\x98\xef\xa3\x9d\xef\xa3\xa2\xef\xa3\xa1\xef\xa3\x9d\xef\xa3\x99";

59

60

61 void disp(void)

62 {

63 glClear(GL_COLOR_BUFFER_BIT);

64

65 glMatrixMode(GL_MODELVIEW);

66 glLoadIdentity();

67

68 dtx_use_font(freeserif, FONT_SIZE);

69

70 glTranslatef(-200, 150, 0);

71 /* XXX call dtx_string to draw utf-8 text.

72 * any transformations and the current color apply

73 */

74 dtx_string(ascii_text);

75

76 glTranslatef(0, -40, 0);

77 dtx_string(greek_text);

78

79 glTranslatef(0, -40, 0);

80 dtx_string(kanji_text);

81

82 dtx_use_font(klingon, FONT_SIZE);

83

84 glTranslatef(0, -40, 0);

85 dtx_string(klingon_text);

86

87 glutSwapBuffers();

88 }

89

90 void reshape(int x, int y)

91 {

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

93

94 glMatrixMode(GL_PROJECTION);

95 glLoadIdentity();

96 glOrtho(-x/2, x/2, -y/2, y/2, -1, 1);

97 }

98

99 void keyb(unsigned char key, int x, int y)

100 {

101 if(key == 27) {

102 exit(0);

103 }

104 }