Multiple point lights

enginecustom/Light.vs

@@ -2,6 +2,10 @@
 // Filename: light.vs
 ////////////////////////////////////////////////////////////////////////////////
 
+/////////////
+// DEFINES //
+/////////////
+#define NUM_LIGHTS 4
 
 /////////////
 // GLOBALS //
@@ -19,6 +23,11 @@ cbuffer CameraBuffer
     float padding;
 };
 
+cbuffer LightPositionBuffer
+{
+    float4 lightPosition[NUM_LIGHTS];
+};
+
 //////////////
 // TYPEDEFS //
 //////////////
@@ -34,7 +43,7 @@ struct PixelInputType
     float4 position : SV_POSITION;
     float2 tex : TEXCOORD0;
     float3 normal : NORMAL;
-    float3 viewDirection : TEXCOORD1;
+    float3 lightPos[NUM_LIGHTS] : TEXCOORD1;
 };
 
 
@@ -45,7 +54,7 @@ PixelInputType LightVertexShader(VertexInputType input)
 {
     PixelInputType output;
     float4 worldPosition;
-
+    int i;
 
     // Change the position vector to be 4 units for proper matrix calculations.
     input.position.w = 1.0f;
@@ -67,11 +76,14 @@ PixelInputType LightVertexShader(VertexInputType input)
      // 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);
+    for(i=0; i<NUM_LIGHTS; i++)
+    {
+        // Determine the light positions based on the position of the lights and the position of the vertex in the world.
+        output.lightPos[i] = lightPosition[i].xyz - worldPosition.xyz;
+
+        // Normalize the light position vectors.
+        output.lightPos[i] = normalize(output.lightPos[i]);
+    }
 
     return output;
 }