float4 Scene_PS (SCENE_VS_OUTPUT Input) : COLOR0
{
	float2 ProjectedTexCoords;
	
    ProjectedTexCoords[0] = Input.ShadowProjection.x / Input.ShadowProjection.w / 2.0f + 0.5f;
    ProjectedTexCoords[1] = -Input.ShadowProjection.y / Input.ShadowProjection.w / 2.0f + 0.5f;
    
	float color = 1.0f;
	
	float4 moments = tex2D(shadowSampler, ProjectedTexCoords);
	
	float len = length(LightPosition - Input.WorldPosition) / MaxLightDepth;
	
	if (len >= moments.x)
	{
		float E_x2 = moments.y;
		float Ex_2 = moments.x * moments.x;
		float variance = min(max(E_x2 - Ex_2, 0.0) + 0.5, 1.0);
		float m_d = (moments.x - len);
		float p = variance / (variance + m_d * m_d);
		
		color = clamp(p, 0, 1);
	}
	
	return color;
}