// ===========================================================================
// Copyright 2018 Autodesk, Inc. All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk license
// agreement provided at the time of installation or download, or which
// otherwise accompanies this software in either electronic or hard copy form.
// ===========================================================================
//
//
//  Creation Date:  Dec 2014
//
//  Description:	Add and remove callbacks triggered before or after rendering a frame.
//
//
//<doc>
//<name addFrameRenderCallback>
//
//<synopsis>
//	addFrameRenderCallback (string $beforeOrAfter, string $commandString)
//
//<description>
//      This proc registers a user-defined command string which will be triggered before or after rendering a frame.
//
//<flags>
//		string $beforeOrAfter	A string, either "before" or "after", to specify the callback type.
//		string $commandString	The callback function to be triggered before or after rendering a frame.
//
//<returns>
//
//<examples>
//	addFrameRenderCallback("after", "clearUpMyRendererResource()");
//	removeFrameRenderCallback("after", "clearUpMyRendererResource()");
//
//</doc>
//

global string $gBeforeFrameRenderCallbacks[];
global string $gAfterFrameRenderCallbacks[];

global proc addFrameRenderCallback(string $beforeOrAfter, string $commandString)
{
	global string $gBeforeFrameRenderCallbacks[];
	global string $gAfterFrameRenderCallbacks[];
	if ($beforeOrAfter=="before") {
		$gBeforeFrameRenderCallbacks[size($gBeforeFrameRenderCallbacks)] = $commandString;
	}
	else {
		$gAfterFrameRenderCallbacks[size($gAfterFrameRenderCallbacks)] = $commandString;
	}
}

global proc removeFrameRenderCallback(string $beforeOrAfter, string $commandString)
{
	global string $gBeforeFrameRenderCallbacks[];
	global string $gAfterFrameRenderCallbacks[];

	if ($beforeOrAfter=="before") {
		int $index = stringArrayFind($commandString, 0, $gBeforeFrameRenderCallbacks);
		if (-1 != $index) {
			stringArrayRemoveAtIndex($index, $gBeforeFrameRenderCallbacks);
		}
	}
	else {
		int $index = stringArrayFind($commandString, 0, $gAfterFrameRenderCallbacks);
		if (-1 != $index) {
			stringArrayRemoveAtIndex($index, $gAfterFrameRenderCallbacks);
		}
	}
}