We'll set up our shader by starting with the shader pair from the Blinn-Phong recipe, but we'll change the fragment shader. Let's set up some uniforms for the light and material information.
For the light sources, we just need a position and an intensity:
uniform struct LightInfo { vec4 Position; // Light position in cam. coords. vec3 L; // Intensity} Light[3];
For materials, we need the three values mentioned previously:
uniform struct MaterialInfo { float Rough; // Roughness bool Metal; // Metallic (true) or dielectric (false) vec3 Color; // Diffuse color for dielectrics, f0 for metallic} Material;
