1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/texture.c	Tue Nov 03 00:42:08 2015 +0200
     1.3 @@ -0,0 +1,33 @@
     1.4 +#include <GL/gl.h>
     1.5 +#include "texture.h"
     1.6 +
     1.7 +static int next_pow2(int x);
     1.8 +
     1.9 +int image_texture(struct texture *tex, struct image *img)
    1.10 +{
    1.11 +	glGenTextures(1, &tex->id);
    1.12 +	glBindTexture(GL_TEXTURE_2D, tex->id);
    1.13 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    1.14 +	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    1.15 +
    1.16 +	tex->width = img->width;
    1.17 +	tex->height = img->height;
    1.18 +	tex->tex_width = next_pow2(tex->width);
    1.19 +	tex->tex_height = next_pow2(tex->height);
    1.20 +
    1.21 +	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex->tex_width, tex->tex_height, 0,
    1.22 +			GL_RGBA, GL_UNSIGNED_BYTE, 0);
    1.23 +	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, tex->width, tex->height,
    1.24 +			GL_RGBA, GL_UNSIGNED_BYTE, img->pixels);
    1.25 +	return 0;
    1.26 +}
    1.27 +
    1.28 +static int next_pow2(int x)
    1.29 +{
    1.30 +	--x;
    1.31 +	x |= x >> 1;
    1.32 +	x |= x >> 2;
    1.33 +	x |= x >> 4;
    1.34 +	x |= x >> 8;
    1.35 +	return x + 1;
    1.36 +}