Specular Lighting

enginecustom/Light.vs

@@ -13,6 +13,12 @@ cbuffer MatrixBuffer
     matrix projectionMatrix;
 };
 
+cbuffer CameraBuffer
+{
+    float3 cameraPosition;
+    float padding;
+};
+
 //////////////
 // TYPEDEFS //
 //////////////
@@ -28,6 +34,7 @@ struct PixelInputType
     float4 position : SV_POSITION;
     float2 tex : TEXCOORD0;
     float3 normal : NORMAL;
+    float3 viewDirection : TEXCOORD1;
 };
 
 
@@ -37,7 +44,8 @@ struct PixelInputType
 PixelInputType LightVertexShader(VertexInputType input)
 {
     PixelInputType output;
-    
+    float4 worldPosition;
+
 
     // Change the position vector to be 4 units for proper matrix calculations.
     input.position.w = 1.0f;
@@ -56,5 +64,14 @@ PixelInputType LightVertexShader(VertexInputType input)
     // Normalize the normal vector.
     output.normal = normalize(output.normal);
 
+     // Calculate the position of the vertex in the world.
+    worldPosition = mul(input.position, worldMatrix);
+
+    // Determine the viewing direction based on the position of the camera and the position of the vertex in the world.
+    output.viewDirection = cameraPosition.xyz - worldPosition.xyz;
+	
+    // Normalize the viewing direction vector.
+    output.viewDirection = normalize(output.viewDirection);
+
     return output;
 }