Support lighting using a graphics buffer that is kep open!

Assets/source/Triangle.vert.hlsl

@@ -2,6 +2,7 @@ struct Output
 {
     float4 Color : TEXCOORD0;
     float3 WorldNormal : TEXCOORD1;
+    float3 WorldPosition : TEXCOORD2;
     float4 Position : SV_Position;
 };
 
@@ -20,8 +21,10 @@ Output main(uint vertexIndex : SV_VertexID)
     float3 normal = asfloat(buffer.Load3(offset + 12));
     float4 col = asfloat(buffer.Load4(offset + 24));
 
-    output.Position = mul(ViewProjection, mul(Model, float4(pos, 1.0f)));
+    float4 worldPos = mul(Model, float4(pos, 1.0f));
+    output.Position = mul(ViewProjection, worldPos);
     output.Color = col;
+    output.WorldPosition = worldPos.xyz;
     
     float3 worldNormal = mul((float3x3)Model, normal);
     output.WorldNormal = worldNormal;