export function setupCanvas(gl, canvas) {
  canvas.width = canvas.clientWidth * window.devicePixelRatio;
  canvas.height = canvas.clientHeight * window.devicePixelRatio;
  gl.viewport(0, 0, canvas.width, canvas.height);

  return {
    canvas,
    gl,
    aspectRatio: canvas.width / canvas.height
  };
}

export function resizeCanvas(gl, canvas, program) {
  canvas.width = canvas.clientWidth * window.devicePixelRatio;
  canvas.height = canvas.clientHeight * window.devicePixelRatio;
  gl.viewport(0, 0, canvas.width, canvas.height);
  gl.useProgram(program);
  gl.uniform2f(gl.getUniformLocation(program, "u_resolution"), canvas.width, canvas.height);
}