Function updateTexture

demo/js/index2.js:4836–4838

(gl, source)

}

function updateTexture(gl, source) {
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, source);
}

function setRectangle(gl, x, y, width, height) {
  var x1 = x;