Постоянная COLOR_ATTACHMENT12
Реализация
static const int COLOR_ATTACHMENT12 = 0x8CEC;
© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-web_gl/WebGL/COLOR_ATTACHMENT12-constant.html
