Support lighting using a graphics buffer that is kep open!

Assets/source/RootConstants.hlsl

@@ -1,5 +1,13 @@
 #ifndef ROOT_CONSTANTS_HLSL
 #define ROOT_CONSTANTS_HLSL
+ 
+struct PointLight
+{
+    float3 Position;
+    float  Radius;
+    float3 Color;
+    float  Intensity;
+};
 
 cbuffer RootConstants : register(b0, space0)
 {
@@ -16,6 +24,9 @@ cbuffer RootConstants : register(b0, space0)
     float    LightPad;
     float3   LightColor;
     float    AmbientIntensity;
+
+    uint     LightBufferIndex;
+    uint     ActiveLightCount;
 };