Implementing per-fragment point light with attenuation

The previous recipe handled a directional light source but without attenuation. The relevant changes to enable per-fragment point light with attenuation will be given in this recipe. We start by implementing per-fragment point light, as in the Implementing per-vertex and per-fragment point lighting recipe.

Getting started

The code for this recipe is contained in the Chapter4/PointLight folder.

How to do it…

Implementing per-fragment point light is demonstrated by following these steps:

1. From the vertex shader, output the eye space vertex position and normal.

   #version 330 core
   layout(location=0) in vec3 vVertex;
   layout(location=1) in vec3 vNormal;
   uniform mat4 MVP;
   uniform mat4 MV;
   uniform mat3 N;
   smooth out vec3 vEyeSpaceNormal;
   smooth out vec3 vEyeSpacePosition;
   
   void main() {
       vEyeSpacePosition = (MV*vec4(vVertex,1)).xyz;
       vEyeSpaceNormal   = N*vNormal;
       gl_Position = MVP*vec4(vVertex,1);
   }

2. In the fragment shader, calculate the light...