xglcomp: src/opengl.cc annotate

xglcomp

added docs

author	John Tsiombikas <nuclear@member.fsf.org>
date	Fri, 29 Jan 2016 10:23:08 +0200
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rev	line source
nuclear@2	1 #include "opengl.h"
nuclear@2	2 #include "logger.h"
nuclear@2	3
nuclear@2	4 extern Display *dpy;
nuclear@2	5 extern Window root_win;
nuclear@2	6 extern int screen_num;
nuclear@2	7 extern int root_width, root_height;
nuclear@2	8
nuclear@2	9 GLXContext create_gl(Window xwin)
nuclear@2	10 {
nuclear@2	11 static int glxattr[] = {
nuclear@2	12 GLX_USE_GL, 1,
nuclear@2	13 GLX_RGBA,
nuclear@2	14 GLX_DOUBLEBUFFER,
nuclear@2	15 GLX_RED_SIZE, 8,
nuclear@2	16 GLX_GREEN_SIZE, 8,
nuclear@2	17 GLX_BLUE_SIZE, 8,
nuclear@2	18 GLX_DEPTH_SIZE, 16,
nuclear@2	19 None
nuclear@2	20 };
nuclear@2	21
nuclear@2	22 XVisualInfo *vis_info = glXChooseVisual(dpy, screen_num, glxattr);
nuclear@2	23 if(!vis_info) {
nuclear@2	24 log_error("failed to find suitable GLX visual\n");
nuclear@2	25 return 0;
nuclear@2	26 }
nuclear@2	27
nuclear@2	28 GLXContext ctx = glXCreateContext(dpy, vis_info, 0, True);
nuclear@2	29 if(!ctx) {
nuclear@2	30 log_error("failed to create OpenGL context\n");
nuclear@2	31 XFree(vis_info);
nuclear@2	32 return 0;
nuclear@2	33 }
nuclear@2	34 XFree(vis_info);
nuclear@2	35
nuclear@2	36 if(!glXMakeCurrent(dpy, xwin, ctx)) {
nuclear@2	37 log_error("failed to attach OpenGL context to window\n");
nuclear@2	38 glXDestroyContext(dpy, ctx);
nuclear@2	39 return 0;
nuclear@2	40 }
nuclear@2	41 return ctx;
nuclear@2	42 }
nuclear@2	43
nuclear@2	44 void destroy_gl(GLXContext ctx)
nuclear@2	45 {
nuclear@2	46 glXMakeCurrent(dpy, 0, 0);
nuclear@2	47 glXDestroyContext(dpy, ctx);
nuclear@2	48 }