nuclear@0: #include <GL/gl.h>
nuclear@0: #include "texture.h"
nuclear@0: 
nuclear@0: static int next_pow2(int x);
nuclear@0: 
nuclear@0: int image_texture(struct texture *tex, struct image *img)
nuclear@0: {
nuclear@0: 	glGenTextures(1, &tex->id);
nuclear@0: 	glBindTexture(GL_TEXTURE_2D, tex->id);
nuclear@0: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@0: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@0: 
nuclear@0: 	tex->width = img->width;
nuclear@0: 	tex->height = img->height;
nuclear@0: 	tex->tex_width = next_pow2(tex->width);
nuclear@0: 	tex->tex_height = next_pow2(tex->height);
nuclear@0: 
nuclear@0: 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex->tex_width, tex->tex_height, 0,
nuclear@0: 			GL_RGBA, GL_UNSIGNED_BYTE, 0);
nuclear@0: 	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, tex->width, tex->height,
nuclear@0: 			GL_RGBA, GL_UNSIGNED_BYTE, img->pixels);
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@1: void destroy_texture(struct texture *tex)
nuclear@1: {
nuclear@1: 	glDeleteTextures(1, &tex->id);
nuclear@1: 	tex->id = 0;
nuclear@1: }
nuclear@1: 
nuclear@0: static int next_pow2(int x)
nuclear@0: {
nuclear@0: 	--x;
nuclear@0: 	x |= x >> 1;
nuclear@0: 	x |= x >> 2;
nuclear@0: 	x |= x >> 4;
nuclear@0: 	x |= x >> 8;
nuclear@0: 	return x + 1;
nuclear@0: }