Добро, такая вот тема, есть хук:
@Hook(at = @At(point = InjectionPoint.METHOD_CALL, target = "drawGradientRect", shift = Shift.INSTEAD))
@SideOnly(Side.CLIENT)
public static void drawScreen(GuiContainer guiScreen, int xMouse, int yMouse, float partialTicks, @Hook.LocalVariable(11)...