OpenGL 4 Shading Language Cookbook - Third Edition

How to do it...

To create a shader pair that implements the Phong reflection model, take the following steps:

1. The vertex shader computes the Phong reflection model at the vertex position and sends the result to the fragment shader:

layout (location = 0) in vec3 VertexPosition; 
layout (location = 1) in vec3 VertexNormal; 
 
out vec3 LightIntensity; 
 
uniform struct LightInfo {  vec4 Position; // Light position in eye coords.  vec3 La;       // Ambient light intensity  vec3 Ld;       // Diffuse light intensity  vec3 Ls;       // Specular light intensity} Light;uniform struct MaterialInfo {  vec3 Ka;      // Ambient reflectivity  vec3 Kd;      // Diffuse reflectivity  vec3 Ks;      // Specular reflectivity  float Shininess; // Specular shininess factor} Material; uniform mat4 ModelViewMatrix; ...