Specular Lighting

enginecustom/Light.ps

@@ -14,6 +14,8 @@ cbuffer LightBuffer
     float4 diffuseColor;
     float3 lightDirection;
     float padding;
+    float specularPower;
+    float4 specularColor;
 };
 
 
@@ -25,6 +27,7 @@ struct PixelInputType
     float4 position : SV_POSITION;
     float2 tex : TEXCOORD0;
     float3 normal : NORMAL;
+    float3 viewDirection : TEXCOORD1;
 };
 
 
@@ -37,6 +40,8 @@ float4 LightPixelShader(PixelInputType input) : SV_TARGET
     float3 lightDir;
     float lightIntensity;
     float4 color;
+    float3 reflection;
+    float4 specular;
 
 
     // Sample the pixel color from the texture using the sampler at this texture coordinate location.
@@ -45,6 +50,10 @@ float4 LightPixelShader(PixelInputType input) : SV_TARGET
     // Set the default output color to the ambient light value for all pixels.
     color = ambientColor;
 
+    // Initialize the specular color.
+    specular = float4(0.0f, 0.0f, 0.0f, 0.0f);
+
+
 	// Invert the light direction for calculations.
     lightDir = -lightDirection;
 
@@ -55,13 +64,22 @@ float4 LightPixelShader(PixelInputType input) : SV_TARGET
     {
         // Determine the final diffuse color based on the diffuse color and the amount of light intensity.
         color += (diffuseColor * lightIntensity);
-    }
 
-    // Saturate the final light color.
-    color = saturate(color);
+        // Saturate the ambient and diffuse color.
+        color = saturate(color);
+
+        // Calculate the reflection vector based on the light intensity, normal vector, and light direction.
+        reflection = normalize(2.0f * lightIntensity * input.normal - lightDir); 
+
+        // Determine the amount of specular light based on the reflection vector, viewing direction, and specular power.
+        specular = pow(saturate(dot(reflection, input.viewDirection)), specularPower);
+    }
 
     // Multiply the texture pixel and the final diffuse color to get the final pixel color result.
     color = color * textureColor;
 
+    // Add the specular component last to the output color.
+    color = saturate(color + specular);
+
     return color;
 }