def begin(callback_data):
buffer_id = self.buffer.get_buffer_id()
if buffer_id and not self.xfb_active:
gl.glEnable(gl.GL_RASTERIZER_DISCARD)
gl.glBindBufferBase(gl.GL_TRANSFORM_FEEDBACK_BUFFER, 0, buffer_id)
gl.glBeginTransformFeedback(gl.GL_TRIANGLES)
self.xfb_active = True
callback_data.upcall()
def begin_callback(callback_data):
buffer_id = self.data.buffer_meshes.get_buffer_id()
if buffer_id and not self.xfb_active:
gl.glEnable(gl.GL_RASTERIZER_DISCARD)
gl.glBindBufferBase(gl.GL_TRANSFORM_FEEDBACK_BUFFER, 0, buffer_id)
gl.glBeginTransformFeedback(gl.GL_TRIANGLES)
self.xfb_active = True
callback_data.upcall()
def feedback(self, mode=GL.GL_POINTS):
GL.glBeginTransformFeedback(mode)
yield
GL.glEndTransformFeedback()
