var cubeShader = new shaderProgram();
cubeShader.addShader(shaders.colorVertexShader);
cubeShader.addShader(shaders.colorFragmentShader);
cubeShader.init();
cubeShader.enableAttrib("position", 3, 4 * (3 + 3), 0);
cubeShader.enableAttrib("color", 3, 4 * (3 + 3), 3 * 4);

class shaderProgram {
    constructor() {
        this.Id = gl.createProgram();
    }

    public Id;

    public addShader(shader:WebGLShader[]):void {
        if(shader instanceof Array) {
            shader.forEach(s => {
                gl.attachShader(this.Id, s);
            });
        } else {
            gl.attachShader(this.Id, shader);
        }
    }

    public init():void {
        gl.linkProgram(this.Id);
    }

    public setActive() {
        gl.useProgram(this.Id);
    }

    public enableAttrib(attribName: string, index: number, stride:number, offset: number) {
        var attrib = gl.getAttribLocation(this.Id, attribName);
        gl.enableVertexAttribArray(attrib);
        gl.vertexAttribPointer(attrib, index, gl.FLOAT, false, stride, offset);
    }

    public setFloatAttrib(attribName:string, value:number) {
        var attrib = gl.getAttribLocation(this.Id, attribName);
        gl.vertexAttrib1f(attrib, value);
    }

    public setMatrix(uniName: string, value: number[]) {
        var uniform = gl.getUniformLocation(this.Id, uniName);
        gl.uniformMatrix4fv(uniform, false, value);
    }
}

public render():void {
    gl.drawElements(gl.TRIANGLES, this._triangles, gl.UNSIGNED_SHORT, 0);
}

attribute vec3 position; //the position of the point
uniform mat4 Pmatrix;
uniform mat4 Vmatrix;
uniform mat4 Mmatrix;
attribute vec3 color; //the color of the point
varying vec3 vColor;
void main(void) { //pre-built function
    gl_Position = Pmatrix*Vmatrix*Mmatrix*vec4(position, 1.); //0. is the z, and 1 is w
    vColor=color;
}