message: rebind vao before glData upload
  Fix .
diff: @@ -77,6 +77,8 @@ export default class MeshRenderer extends core.ObjectRenderer {
  mesh._glDatas[renderer.CONTEXT_UID] = glData;
  }
  + renderer.bindVao(glData.vao);
  +
  if (mesh.dirty !== glData.dirty)
  {
  glData.dirty = mesh.dirty;
  @@ -103,7 +105,6 @@ export default class MeshRenderer extends core.ObjectRenderer {
  const drawMode = mesh.drawMode === Mesh.DRAW_MODES.TRIANGLE_MESH ? gl.TRIANGLE_STRIP : gl.TRIANGLES;
  - renderer.bindVao(glData.vao);
  glData.vao.draw(drawMode, mesh.indices.length, 0);
  }
  }
  