LayerLit layer mask is now rgb (layer0 is always 100%)

Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Material/Lit/LitData.hlsl

     return result;
 }
 
-void ComputeMaskWeights(float4 inputMasks, out float outWeights[_MAX_LAYER])
+void ComputeMaskWeights(float3 inputMasks, out float outWeights[_MAX_LAYER])
-    masks[0] = inputMasks.r;
-    masks[1] = inputMasks.g;
-    masks[2] = inputMasks.b;
-    masks[3] = inputMasks.a;
+    masks[0] = 1.0f; // Layer 0 is always full
+    masks[1] = inputMasks.r;
+    masks[2] = inputMasks.g;
+    masks[3] = inputMasks.b;
 
     // calculate weight of each layers
     float left = 1.0f;
 
 void GetSurfaceAndBuiltinData(FragInput input, out SurfaceData surfaceData, out BuiltinData builtinData)
 {
-    float4 maskValues = float4(1.0, 0.0, 0.0, 0.0);// input.vertexColor;
+    // Mask Values : Layer 1, 2, 3 are r, g, b
+    float3 maskValues = float3(0.0, 0.0, 0.0);// input.vertexColor;
-    float4 maskMap = SAMPLE_TEXTURE2D(_LayerMaskMap, sampler_LayerMaskMap, input.texCoord0);
-    maskValues = maskMap;
+    maskValues = SAMPLE_TEXTURE2D(_LayerMaskMap, sampler_LayerMaskMap, input.texCoord0).rgb;
 #endif
 
     float weights[_MAX_LAYER];