buffer tests

• test ELEMENT_ARRAY_BUFFER17ms ‣

  const {gl} = createContext2();
  if (!gl) {
    return;
  }
  const tracker = new MemInfoTracker(gl, 'buffer');
  const va1 = gl.createVertexArray();
  gl.bindVertexArray(va1);
  const buf1 = gl.createBuffer();
  tracker.addObjects(1);
  gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buf1);
  const size1 = 26;
  gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, size1, gl.STATIC_DRAW);
  tracker.addMemory(size1);
  const va2 = gl.createVertexArray();
  gl.bindVertexArray(va2);
  const buf2 = gl.createBuffer();
  tracker.addObjects(1);
  gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buf2);
  const size2 = 55;
  gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, size2, gl.STATIC_DRAW);
  tracker.addMemory(size2);
  gl.bindVertexArray(va1);
  const size1a = 5;
  gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, size1a, gl.STATIC_DRAW);
  tracker.addMemory(size1a - size1);
  gl.deleteBuffer(buf1);
  tracker.deleteObjectAndMemory(size1a);
  gl.deleteBuffer(buf2);
  tracker.deleteObjectAndMemory(size2);