thi-ng/umbrella

import { V3 } from "@thi.ng/shader-ast/api/types";
import type { GLSL } from "./api/glsl.js";
import type { Material } from "./api/material.js";
import type { ShaderUniformSpecs } from "./api/shader.js";

export const DEFAULT_MATERIAL: Material = {
    ambientCol: [0.1, 0.1, 0.1],
    diffuseCol: [0.8, 0.8, 0.8],
    specularCol: [1, 1, 1],
};

const TYPES: Record<keyof Material, GLSL> = {
    ambientCol: V3,
    diffuseCol: V3,
    specularCol: V3,
};

export const defMaterial = (
    mat: Partial<Material> = {},
    flags: Partial<Record<keyof Material, boolean>> = {},
    base = DEFAULT_MATERIAL
): ShaderUniformSpecs =>
    Object.keys(base).reduce((acc: any, id) => {
        (<any>flags)[id] !== false &&
            (acc[id] = [(<any>TYPES)[id], (<any>mat)[id] || (<any>base)[id]]);
        return acc;
    }, {});