"use strict";

const StairMaterialGame = (function(){

    const StairMaterialGame = function(hollow_bond){

        let material = null;

        this.get = () => {
            if(material) return material;

            const theme_def = (hollow_bond.theme && hollow_bond.theme.stair) ? hollow_bond.theme.stair : {
                vertex: `
                    varying vec3 vNormal;
                    void main(){
                        vNormal = normalize(normalMatrix * normal);
                        gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
                    }
                `,
                fragment: `
                    varying vec3 vNormal;
                    void main(){
                        gl_FragColor = vec4(vec3(0.25) + abs(vNormal.y) * 0.1, 1.0);
                    }
                `
            };

            material = new THREE.ShaderMaterial({
                vertexShader: theme_def.vertex,
                fragmentShader: theme_def.fragment,
                side: THREE.DoubleSide
            });

            return material;
        };

        this.reset = () => {
            if(material){
                material.dispose();
                material = null;
            }
        };

    };

    return StairMaterialGame;
})();