1 #include <imago2.h>

2 #include "opengl.h"

3

4 static void bind_common(GLenum type, unsigned int tex, int tex_unit);

5

6 unsigned int load_texture(const char *fname)

7 {

8 unsigned int tex;

9 struct img_pixmap img;

10 int intfmt, fmt, type;

11

12 img_init(&img);

13 if(img_load(&img, fname) == -1) {

14 fprintf(stderr, "failed to load texture: %s\n", fname);

15 return 0;

16 }

17 intfmt = img_glintfmt(&img);

18 fmt = img_glfmt(&img);

19 type = img_gltype(&img);

20

21 glGenTextures(1, &tex);

22 glBindTexture(GL_TEXTURE_2D, tex);

23 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

24 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

25 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

26 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

27 glTexImage2D(GL_TEXTURE_2D, 0, intfmt, img.width, img.height, 0, fmt, type, img.pixels);

28 img_destroy(&img);

29 return tex;

30 }

31

32 unsigned int load_texture_cube(const char *fname)

33 {

34 /* TODO implement */

35 return 0;

36 }

37

38 void free_texture(unsigned int tex)

39 {

40 if(tex && glIsTexture(tex)) {

41 glDeleteTextures(1, &tex);

42 }

43 }

44

45 void bind_texture(unsigned int tex, int tex_unit)

46 {

47 bind_common(GL_TEXTURE_2D, tex, tex_unit);

48 }

49

50 void bind_texture_cube(unsigned int tex, int tex_unit)

51 {

52 bind_common(GL_TEXTURE_CUBE_MAP, tex, tex_unit);

53 }

54

55 static void bind_common(GLenum type, unsigned int tex, int tex_unit)

56 {

57 glActiveTextureARB(GL_TEXTURE0 + (GLenum)tex_unit);

58 if(tex) {

59 glBindTexture(type, tex);

60 glEnable(type);

61 } else {

62 glDisable(type);

63 }

64 glActiveTextureARB(GL_TEXTURE0);

65 }