private void unloadGL()
{
GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
GL.BindVertexArray(0);
GL.UseProgram(0);
GL.DeleteFramebuffer(frameBufferObject);
GL.DeleteBuffer(quadVertexObject);
GL.DeleteVertexArray(quadArrayObject);
GL.DeleteBuffer(vertexBufferObject);
GL.DeleteBuffer(elementBufferObject);
GL.DeleteVertexArray(vertexArrayObject);
lineMat.Dispose();
blitMat.Dispose();
threshMat.Dispose();
blurMat.Dispose();
}
