skein/frag_lit.glsl

#version 330 core

in vec3 Normal;
in vec3 FragPos;
in mat4x4 ModelViewProjection;

out vec4 FragColor;

void main()
{
    vec3 objectColor = vec3(1.0, 0.5, 0.2);
    vec3 result;

    // Ambient lighting
    vec3 ambientLightColor = vec3(1.0, 1.0, 1.0);
    float ambientStrength = 0.1;
    vec3 ambient = ambientStrength * ambientLightColor;

    // Directional lighting
    vec3 directionalLightColor = vec3(1.0, 1.0, 1.0);
    vec3 lightPos = (ModelViewProjection * vec4(6.0, -7.0, 8.0, 1.0)).xyz;
    vec3 normal = normalize(Normal);
    vec3 lightDir = normalize(lightPos - FragPos);
    float diff = max(dot(normal, lightDir), 0.0);
    vec3 diffuse = diff * directionalLightColor;

    result = (ambient + diffuse) * objectColor;

    FragColor = vec4(result, 1.0);
}