Added way to set global light from game.

+ Some clean up in the mesh renderer

Assets/source/RootConstants.hlsl

@@ -21,19 +21,21 @@ cbuffer RootConstants : register(b0, space0)
     uint     TransformsBufferIndex;
     uint     BufferIndex;
     uint     TextureIndex;
-    uint     VertexOffset; // Base vertex for indexed drawing with bindless buffers
-    uint     _Padding;     // Padding for alignment
-    float2   Scale;        // 2D scale factor
-    float2   Translate;    // 2D translation
-    float2   _Padding2;    // Explicit padding to align LightDirection to 16 bytes
-    
-    float3   GlobalLightDirection;  // Normalized, world-space
-    float    GlobalLightPad;
-    float3   GlobalLightColor;
-    float    GlobalAmbientIntensity;
-
+    uint     VertexOffset;          // Base vertex for indexed drawing with bindless buffers
     uint     LightBufferIndex;
     uint     ActiveLightCount;
+    float    GlobalAmbientIntensity;
+
+    float3   GlobalLightDirection;  // Normalized, world-space
+    uint     _Pad1;
+
+    float3   GlobalLightColor;
+    uint     _Pad2;
+    
+    float2   Scale;                 // 2D scale factor
+    float2   Translate;             // 2D translation
+
+    float4   MeshAlbedo;
 };