+void
+createWindow(Drawable *drawable, const Visual *visual);
+
+void
+destroyWindow(Drawable *drawable);
+
+Drawable *
+createPixmap(unsigned width, unsigned height, unsigned depth);
+
+Drawable *
+createGLPixmap(GLXFBConfig fbconfig, Drawable *pixmap,
+ unsigned width, unsigned height, int *attrib_list);
+
+void
+bindTexImage(glws::Drawable *pixmap, int buffer);
+
+void
+releaseTexImage(glws::Drawable *pixmap, int buffer);
+
+void
+copySubBuffer(glws::Drawable *drawable, int x, int y, int width, int height);
+
+void
+putImageData(glws::Drawable *drawable, char *data,
+ int width, int height, int depth,
+ int bits_per_pixel, int bytes_per_line, int byte_order);
+
+GLXFBConfig
+chooseConfig(int *attrib_list);
+