var createShader = function(src, type) {
	var shader = gl.createShader(type);
	gl.shaderSource(shader, src);
	gl.compileShader(shader);
	if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
		throw gl.getShaderInfoLog(shader);
	}
	return shader;
}

var createProgram = function(vs, fs) {
	var program = gl.createProgram();
	var vs = createShader(vs, gl.VERTEX_SHADER);
	var fs = createShader(fs, gl.FRAGMENT_SHADER);
	gl.attachShader(program, vs);
	gl.attachShader(program, fs);
	gl.linkProgram(program);
	if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
		throw gl.getProgramInfoLog(program);
	}
	return program;
}