Various debug to check lighting

Assets/source/RootConstants.hlsl

@@ -27,10 +27,10 @@ cbuffer RootConstants : register(b0, space0)
     float2   Translate;    // 2D translation
     float2   _Padding2;    // Explicit padding to align LightDirection to 16 bytes
     
-    float3   LightDirection;  // Normalized, world-space
-    float    LightPad;
-    float3   LightColor;
-    float    AmbientIntensity;
+    float3   GlobalLightDirection;  // Normalized, world-space
+    float    GlobalLightPad;
+    float3   GlobalLightColor;
+    float    GlobalAmbientIntensity;
 
     uint     LightBufferIndex;
     uint     ActiveLightCount;