xgetshape: src/texture.c annotate

xgetshape

getting the window shape of another window

author	John Tsiombikas <nuclear@member.fsf.org>
date	Tue, 03 Nov 2015 00:42:08 +0200
parents
children	9b560415bad4

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@0	25 static int next_pow2(int x)
nuclear@0	26 {
nuclear@0	27 --x;
nuclear@0	28 x \|= x >> 1;
nuclear@0	29 x \|= x >> 2;
nuclear@0	30 x \|= x >> 4;
nuclear@0	31 x \|= x >> 8;
nuclear@0	32 return x + 1;
nuclear@0	33 }