Redo of render paths

res/shaders/lib/LightEnv.slang

@@ -0,0 +1,70 @@
+import InputGeometry;
+import BRDF;
+import Common;
+
+interface ILightEnv
+{
+	float3 illuminate<B:IBRDF>(InputGeometry input, B brdf, float3 wo);
+};
+
+struct DirectionalLight : ILightEnv
+{
+	float4 color;
+	float4 direction;
+	float4 intensity;
+
+    float3 illuminate<B:IBRDF>(MaterialPixelParameter input, B brdf, float3 wo)
+	{
+		return intensity.xyz * brdf.evaluate(wo, direction.xyz, input.normal, input.tangent, input.biTangent, color.xyz);	
+    }
+};
+
+struct PointLight : ILightEnv
+{
+    float4 positionWS;
+    float4 positionVS;
+    float3 color;
+    float range;
+
+    float3 illuminate<B:IBRDF>(MaterialPixelParameter input, B brdf, float3 viewDir)
+	{
+        float3 lightVec = positionWS.xyz - input.position;
+        float d = length(lightVec);
+        float3 direction = normalize(lightVec);
+        float illuminance = max(1 - d / range, 0);
+		return illuminance * brdf.evaluate(viewDir, direction, input.normal, input.tangent, input.biTangent, color);
+    }
+
+	bool insidePlane(Plane plane)
+	{
+        return dot(plane.n, positionVS.xyz) - plane.d < -range;
+	}
+
+	bool insideFrustum(Frustum frustum, float zNear, float zFar)
+	{
+        bool result = true;
+
+		//if(positionVS.z - range > zNear || positionVS.z + range < zFar)
+		{
+		//	result = false;
+		}
+		for(int i = 0; i < 4 && result; ++i)
+		{
+			if(insidePlane(frustum.planes[i]))
+			{
+				result = false;
+			}
+		}
+		return result;
+	}
+};
+
+#define MAX_DIRECTIONAL_LIGHTS 4
+#define MAX_POINT_LIGHTS 256
+struct Lights
+{
+    DirectionalLight directionalLights[MAX_DIRECTIONAL_LIGHTS];
+    PointLight pointLights[MAX_POINT_LIGHTS];
+    uint numDirectionalLights;
+    uint numPointLights;
+};