xgetshape
annotate src/texture.c @ 1:9b560415bad4
blured shadow
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Tue, 03 Nov 2015 04:08:32 +0200 |
| parents | 2f02f100b20f |
| children |
| rev | line source |
|---|---|
| nuclear@0 | 1 #include <GL/gl.h> |
| nuclear@0 | 2 #include "texture.h" |
| nuclear@0 | 3 |
| nuclear@0 | 4 static int next_pow2(int x); |
| nuclear@0 | 5 |
| nuclear@0 | 6 int image_texture(struct texture *tex, struct image *img) |
| nuclear@0 | 7 { |
| nuclear@0 | 8 glGenTextures(1, &tex->id); |
| nuclear@0 | 9 glBindTexture(GL_TEXTURE_2D, tex->id); |
| nuclear@0 | 10 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| nuclear@0 | 11 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| nuclear@0 | 12 |
| nuclear@0 | 13 tex->width = img->width; |
| nuclear@0 | 14 tex->height = img->height; |
| nuclear@0 | 15 tex->tex_width = next_pow2(tex->width); |
| nuclear@0 | 16 tex->tex_height = next_pow2(tex->height); |
| nuclear@0 | 17 |
| nuclear@0 | 18 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex->tex_width, tex->tex_height, 0, |
| nuclear@0 | 19 GL_RGBA, GL_UNSIGNED_BYTE, 0); |
| nuclear@0 | 20 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, tex->width, tex->height, |
| nuclear@0 | 21 GL_RGBA, GL_UNSIGNED_BYTE, img->pixels); |
| nuclear@0 | 22 return 0; |
| nuclear@0 | 23 } |
| nuclear@0 | 24 |
| nuclear@1 | 25 void destroy_texture(struct texture *tex) |
| nuclear@1 | 26 { |
| nuclear@1 | 27 glDeleteTextures(1, &tex->id); |
| nuclear@1 | 28 tex->id = 0; |
| nuclear@1 | 29 } |
| nuclear@1 | 30 |
| nuclear@0 | 31 static int next_pow2(int x) |
| nuclear@0 | 32 { |
| nuclear@0 | 33 --x; |
| nuclear@0 | 34 x |= x >> 1; |
| nuclear@0 | 35 x |= x >> 2; |
| nuclear@0 | 36 x |= x >> 4; |
| nuclear@0 | 37 x |= x >> 8; |
| nuclear@0 | 38 return x + 1; |
| nuclear@0 | 39 } |