R"(#version 330 core
out vec4 color;
uniform vec3 u_color;

in vec3 normal;
in vec4 pos;

void main()
{
    vec3 norm = normalize(normal);
    vec3 lightDir = normalize(vec3(4.0,3.0,3.0) - pos.xyz);

    float diff = max(dot(norm, lightDir), 0.0);

    // set light color
    vec3 diffuse = diff * vec3(1.0,1.0,1.0);

    vec3 result = (diffuse) * u_color;
    color = vec4(result,0.0);
})";