public static unsafe IntPtr CreateShim(ICallbackHandler handler)
{
if (handler == null)
{
return(IntPtr.Zero);
}
if (savedDelegates != null)
{
throw new InvalidOperationException("Callbacks should only be initialized once; bgfx can only deal with one set at a time.");
}
var memory = Marshal.AllocHGlobal(Marshal.SizeOf <CallbackShim>());
var shim = (CallbackShim *)memory;
var saver = new DelegateSaver(handler, shim);
// the shim uses the unnecessary ctor slot to act as a vtbl pointer to itself,
// so that the same block of memory can act as both bgfx_callback_interface_t and bgfx_callback_vtbl_t
shim->vtbl = memory + IntPtr.Size;
// cache the data so we can free it later
shimMemory = memory;
savedDelegates = saver;
return(memory);
}
public static void FreeShim()
{
if (savedDelegates == null)
return;
savedDelegates = null;
Marshal.FreeHGlobal(shimMemory);
}
public static unsafe IntPtr CreateShim(ICallbackHandler handler)
{
if (handler == null)
return IntPtr.Zero;
if (savedDelegates != null)
throw new InvalidOperationException("Callbacks should only be initialized once; bgfx can only deal with one set at a time.");
var memory = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(CallbackShim)));
var shim = (CallbackShim*)memory;
var saver = new DelegateSaver(handler, shim);
// the shim uses the unnecessary ctor slot to act as a vtbl pointer to itself,
// so that the same block of memory can act as both bgfx_callback_interface_t and bgfx_callback_vtbl_t
shim->vtbl = memory + IntPtr.Size;
// cache the data so we can free it later
shimMemory = memory;
savedDelegates = saver;
return memory;
}
