def load_spritesheet(self, filename):
if filename[-4:] == ".png":
glcontext = gtk.gtkgl.widget_get_gl_context(self.drawing_area)
gldrawable = gtk.gtkgl.widget_get_gl_drawable(self.drawing_area)
gldrawable.gl_begin(glcontext)
#construction uses OpenGL so needs to be in GL context.
self.spritesheet = Graphic(filename)
self.spritesheet.draw()
if gldrawable.is_double_buffered():
gldrawable.swap_buffers()
else:
glFlush()
gldrawable.gl_end()
glcontext = gtk.gtkgl.widget_get_gl_context(self.preview_gl)
gldrawable = gtk.gtkgl.widget_get_gl_drawable(self.preview_gl)
gldrawable.gl_begin(glcontext)
self.preview = Animated(filename)
gldrawable.gl_end()
self.builder.get_object("action").set_sensitive(True)
self.builder.get_object("preview_frame").set_sensitive(True)
