To create a shader program that renders using the Blinn-Phong reflection model with multiple light sources, use the following steps:
In the vertex shader, we'll use a similar structure as in the previous recipes, except we will use an array of structures for the lights. In addition, we just store two intensities for each light. The first is the ambient intensity and the second is used for both diffuse and specular. The phongModel function is updated to use light information from one of the values in the array:
layout (location = 0) in vec3 VertexPosition;
layout (location = 1) in vec3 VertexNormal;
out vec3 Color;
uniform struct LightInfo { vec4 Position; // Light position in eye coords. vec3 La; // Ambient light intesity ...
