lots of updates

funnyassets/shaders/brdf.hlsl

@@ -0,0 +1,33 @@
+float GetSpecularThreshold( float m_fMetalness )
+{
+	return 0;
+}
+
+struct BRDF_Data
+{
+	float3 m_vRayIn;
+	float3 m_vRayOut;
+	float3 m_vNormal;
+	float3 m_vAlbedo;
+	float m_fRoughness;
+	float m_fMetalness;
+
+	float FresnelDiffuseTerm( float fSine )
+	{
+		return (fSine * (1 - 0.5 * m_fRoughness) + 0.5 * m_fRoughness);
+	}
+
+	float3 BurleyDiffuse( )
+	{
+		float fSineNormalLight = saturate(dot(m_vNormal, m_vRayOut));
+		float fSineNormalView = saturate(dot(m_vNormal, m_vRayIn));
+		float fFresnelLight = FresnelDiffuseTerm(fSineNormalLight);
+		float fFresnelView = FresnelDiffuseTerm(fSineNormalView);
+		return fFresnelView * fFresnelLight;
+	}
+
+	float3 GetOutGoingDirection()
+	{
+		return 0;
+	}
+}