local SHADER = {
    shared = {
        uniform = {
            time = 0,
        },
    },

    vertex = {
        uniform = {
            camera_matrix = "mat4",
            model_matrix = "mat4",
        },
        attributes = {
            {pos = "vec3"},
            {normal = "vec3"},
            {uv = "vec2"},
        },
        source = [[
            void main()
            {
                // if this is commented out, the normal is just
                // passed onto the fragment shader as it is

                /*
                    mat3 world_inverse = transpose(mat3(camera_matrix));
                    mat3 normal_matrix = transpose(inverse(mat3(model_matrix)));
                    glw_out_normal = normalize(world_inverse * normal_matrix * normal);
                */

                gl_Position = camera_matrix * model_matrix * vec4(pos, 1.0);
            }
        ]]
    },

    fragment = {
        uniform = {
            diffuse = "sampler2D",
            bump = "sampler2D",
            specular = "sampler2D",
        },
        attributes = {
            pos = "vec3",
            normal = "vec3",
            uv = "vec2",
        },
        source = [[
            out vec4 out_data[4];

            void main()
            {
                out_data[0] = texture2D(diffuse, uv);
                out_data[1] = vec4(normalize(normal.xyz + texture2D(bump, uv).xyz), 1);
                out_data[2] = vec4(pos.xyz, 1);
                out_data[3] = texture2D(specular, uv);
            }
        ]]
    }
}