export function compile_shader(gl, type, src) {
	const s = gl.createShader(type);
	gl.shaderSource(s, src);
	gl.compileShader(s);
	if (!gl.getShaderParameter(s, gl.COMPILE_STATUS)) { throw new Error(gl.getShaderInfoLog(s)); }
	return s;
}

export function create_program(gl, vs_src, fs_src) {
	const p = gl.createProgram();
	gl.attachShader(p, compile_shader(gl, gl.VERTEX_SHADER,   vs_src));
	gl.attachShader(p, compile_shader(gl, gl.FRAGMENT_SHADER, fs_src));
	gl.linkProgram(p);
	if (!gl.getProgramParameter(p, gl.LINK_STATUS)) { throw new Error(gl.getProgramInfoLog(p)); }
	return p;
}

export function make_buffer(gl, data) {
	const buf = gl.createBuffer();
	gl.bindBuffer(gl.ARRAY_BUFFER, buf);
	gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);
	return buf;
}