Shaders: add comment for GetSpecular()

bin/CoreData/Shaders/GLSL/Lighting.glsl

@@ -163,6 +163,7 @@ float GetDiffuseVolumetric(vec3 worldPos)
     #endif
 }
 
+// https://en.wikipedia.org/wiki/Blinn%E2%80%93Phong_reflection_model
 float GetSpecular(vec3 normal, vec3 eyeVec, vec3 lightDir, float specularPower)
 {
     vec3 halfVec = normalize(normalize(eyeVec) + lightDir);  

bin/CoreData/Shaders/HLSL/Lighting.hlsl

@@ -176,6 +176,7 @@ float GetDiffuseVolumetric(float3 worldPos)
     #endif
 }
 
+// https://en.wikipedia.org/wiki/Blinn%E2%80%93Phong_reflection_model
 float GetSpecular(float3 normal, float3 eyeVec, float3 lightDir, float specularPower)
 {
     float3 halfVec = normalize(normalize(eyeVec) + lightDir);