1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/opengl.cc	Fri Jan 22 06:31:03 2016 +0200
     1.3 @@ -0,0 +1,48 @@
     1.4 +#include "opengl.h"
     1.5 +#include "logger.h"
     1.6 +
     1.7 +extern Display *dpy;
     1.8 +extern Window root_win;
     1.9 +extern int screen_num;
    1.10 +extern int root_width, root_height;
    1.11 +
    1.12 +GLXContext create_gl(Window xwin)
    1.13 +{
    1.14 +	static int glxattr[] = {
    1.15 +		GLX_USE_GL, 1,
    1.16 +		GLX_RGBA,
    1.17 +		GLX_DOUBLEBUFFER,
    1.18 +		GLX_RED_SIZE, 8,
    1.19 +		GLX_GREEN_SIZE, 8,
    1.20 +		GLX_BLUE_SIZE, 8,
    1.21 +		GLX_DEPTH_SIZE, 16,
    1.22 +		None
    1.23 +	};
    1.24 +
    1.25 +	XVisualInfo *vis_info = glXChooseVisual(dpy, screen_num, glxattr);
    1.26 +	if(!vis_info) {
    1.27 +		log_error("failed to find suitable GLX visual\n");
    1.28 +		return 0;
    1.29 +	}
    1.30 +
    1.31 +	GLXContext ctx = glXCreateContext(dpy, vis_info, 0, True);
    1.32 +	if(!ctx) {
    1.33 +		log_error("failed to create OpenGL context\n");
    1.34 +		XFree(vis_info);
    1.35 +		return 0;
    1.36 +	}
    1.37 +	XFree(vis_info);
    1.38 +
    1.39 +	if(!glXMakeCurrent(dpy, xwin, ctx)) {
    1.40 +		log_error("failed to attach OpenGL context to window\n");
    1.41 +		glXDestroyContext(dpy, ctx);
    1.42 +		return 0;
    1.43 +	}
    1.44 +	return ctx;
    1.45 +}
    1.46 +
    1.47 +void destroy_gl(GLXContext ctx)
    1.48 +{
    1.49 +	glXMakeCurrent(dpy, 0, 0);
    1.50 +	glXDestroyContext(dpy, ctx);
    1.51 +}