public void UpdateShadowMap(Scene s, Matrix4 VP)
{
var viewportBounds = new int[4];
GL.GetInteger(GetPName.Viewport, viewportBounds);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, frameBuffer);
GL.DrawBuffer(DrawBufferMode.None);
GL.Disable(EnableCap.Blend);
GL.ClearDepth(1);
GL.Clear(ClearBufferMask.DepthBufferBit);
GL.Viewport(0, 0, ShadowMapSize, ShadowMapSize);
ShadowGenShader Instance = ShadowGenShader.Instance;
Instance.Bind();
//GL.Disable (EnableCap.CullFace);
s.RenderWithShader(VP, Instance);
GL.Enable(EnableCap.CullFace);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
GL.DrawBuffer(DrawBufferMode.Back);
GL.Viewport(viewportBounds[0], viewportBounds[1], viewportBounds[2], viewportBounds[3]);
/*GL.DepthFunc (DepthFunction.Always);
* OrthoRenderEngine.DrawColoredTextureOnEntireScreen (Util.White, shadowMap);
* GL.DepthFunc (DepthFunction.Never);*/
GL.Enable(EnableCap.DepthTest);
GL.Enable(EnableCap.Blend);
}
