1 /*

2 Stereoscopic tunnel for iOS.

3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>

4

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

9

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU General Public License for more details.

14

15 You should have received a copy of the GNU General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

18

19 #include <stdio.h>

20 #include <stdlib.h>

21 #include <string.h>

22 #include <errno.h>

23 #include "opengl.h"

24 #include "tex.h"

25 #include "config.h"

26 #include "imago2.h"

27

28 unsigned int load_texture(const char *fname)

29 {

30 int xsz, ysz;

31 unsigned int tex;

32 void *pixels;

33

34 if(!fname) {

35 return 0;

36 }

37 if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {

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

39 return 0;

40 }

41

42 glGenTextures(1, &tex);

43 glBindTexture(GL_TEXTURE_2D, tex);

44 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

45 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

46 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

47 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

48 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);

49 img_free_pixels(pixels);

50

51 return tex;

52 }

53

54 void bind_texture(unsigned int tex, int unit)

55 {

56 glActiveTexture(GL_TEXTURE0 + unit);

57

58 #ifndef IPHONE

59 if(tex) {

60 glEnable(GL_TEXTURE_2D);

61 } else {

62 glDisable(GL_TEXTURE_2D);

63 }

64 #endif

65

66 glBindTexture(GL_TEXTURE_2D, tex);

67 }