duplicate phong ps for phong spec

hw3d/PhongPSSpecMap.hlsl

+cbuffer LightCBuf
+{
+    float3 lightPos;
+    float3 ambient;
+    float3 diffuseColor;
+    float diffuseIntensity;
+    float attConst;
+    float attLin;
+    float attQuad;
+};
+
+Texture2D tex;
+Texture2D spec;
+
+SamplerState splr;
+
+
+float4 main(float3 worldPos : Position, float3 n : Normal, float2 tc : Texcoord) : SV_Target
+{
+	// fragment to light vector data
+    const float3 vToL = lightPos - worldPos;
+    const float distToL = length(vToL);
+    const float3 dirToL = vToL / distToL;
+	// attenuation
+    const float att = 1.0f / (attConst + attLin * distToL + attQuad * (distToL * distToL));
+	// diffuse intensity
+    const float3 diffuse = diffuseColor * diffuseIntensity * att * max(0.0f, dot(dirToL, n));
+	// reflected light vector
+    const float3 w = n * dot(vToL, n);
+    const float3 r = w * 2.0f - vToL;
+	// calculate specular intensity based on angle between viewing vector and reflection vector, narrow with power function
+    const float3 specular = att * (diffuseColor * diffuseIntensity) * specularIntensity * pow(max(0.0f, dot(normalize(-r), normalize(worldPos))), specularPower);
+	// final color
+    return float4(saturate(diffuse + ambient + specular), 1.0f) * tex.Sample(splr, tc);
+}
\ No newline at end of file