Feature node libs

[kalwalt]

jsartoolkitNFT imported in a node environment

This continue from #128. As said in the issue and other, we should create an independentlib for node. The main reason is the loading of files, in node.js is different compared to a browser env. I will try to use the NODEFS loading the FyleSystem (FS). Note that this code in the PR is quite experimental, and i can't assure of the result.

Tasks to be completed

• develop a uniqe lib for node
• removing not necessary code for node
• implement the basic methods to run a simple app

[kalwalt]

The new loadCamera function now can run without errors but i don't receive a message like:
artoolkitNFT_ES6_wasm.js:9 [warning] *** Camera Parameter resized from 640, 480. ***
This should come from setCamera() inside setup():

jsartoolkitNFT/emscripten/ARToolKitJS.cpp

Lines 704 to 741 in 251de77

	int setup(int width, int height, int cameraID) {
	int id = gARControllerID++;
	arController *arc = &(arControllers[id]);
	arc->id = id;
	arc->width = width;
	arc->height = height;
	arc->videoFrameSize = width * height * 4 * sizeof(ARUint8);
	arc->videoFrame = (ARUint8*) malloc(arc->videoFrameSize);
	arc->videoLuma = (ARUint8*) malloc(arc->videoFrameSize / 4);
	setCamera(id, cameraID);
	webarkitLOGi("Allocated videoFrameSize %d", arc->videoFrameSize);
	EM_ASM_({
	if (!artoolkitNFT["frameMalloc"]) {
	artoolkitNFT["frameMalloc"] = ({});
	}
	var frameMalloc = artoolkitNFT["frameMalloc"];
	frameMalloc["framepointer"] = $1;
	frameMalloc["framesize"] = $2;
	frameMalloc["camera"] = $3;
	frameMalloc["transform"] = $4;
	frameMalloc["videoLumaPointer"] = $5;
	},
	arc->id,
	arc->videoFrame,
	arc->videoFrameSize,
	arc->cameraLens,
	gTransform,
	arc->videoLuma //$5
	);
	return arc->id;
	}

setCamera:

jsartoolkitNFT/emscripten/ARToolKitJS.cpp

Lines 413 to 456 in 251de77

	int setCamera(int id, int cameraID) {
	if (arControllers.find(id) == arControllers.end()) { return -1; }
	arController *arc = &(arControllers[id]);
	if (cameraParams.find(cameraID) == cameraParams.end()) { return -1; }
	arc->param = cameraParams[cameraID];
	if (arc->param.xsize != arc->width || arc->param.ysize != arc->height) {
	ARLOGw("*** Camera Parameter resized from %d, %d. ***\n", arc->param.xsize, arc->param.ysize);
	arParamChangeSize(&(arc->param), arc->width, arc->height, &(arc->param));
	}
	// ARLOGi("*** Camera Parameter ***\n");
	// arParamDisp(&(arc->param));
	deleteHandle(arc);
	if ((arc->paramLT = arParamLTCreate(&(arc->param), AR_PARAM_LT_DEFAULT_OFFSET)) == NULL) {
	webarkitLOGe("setCamera(): Error: arParamLTCreate.");
	return -1;
	}
	// ARLOGi("setCamera(): arParamLTCreated\n..%d, %d\n", (arc->paramLT->param).xsize, (arc->paramLT->param).ysize);
	// setup camera
	if ((arc->arhandle = arCreateHandle(arc->paramLT)) == NULL) {
	webarkitLOGe("setCamera(): Error: arCreateHandle.");
	return -1;
	}
	// AR_DEFAULT_PIXEL_FORMAT
	int set = arSetPixelFormat(arc->arhandle, arc->pixFormat);
	arc->ar3DHandle = ar3DCreateHandle(&(arc->param));
	if (arc->ar3DHandle == NULL) {
	webarkitLOGe("setCamera(): Error creating 3D handle");
	return -1;
	}
	arglCameraFrustumRH(&((arc->paramLT)->param), arc->nearPlane, arc->farPlane, arc->cameraLens);
	arc->kpmHandle = createKpmHandle(arc->paramLT);
	return 0;

It could depends by the type of printings, maybe stream by ARLOGw is not outputted in node?

[kalwalt]

i make a simple test, i added a simple std::cout message before:

if (arc->param.xsize != arc->width || arc->param.ysize != arc->height) { 
 		ARLOGw("*** Camera Parameter resized from %d, %d. ***\n", arc->param.xsize, arc->param.ysize); 
 		arParamChangeSize(&(arc->param), arc->width, arc->height, &(arc->param)); 
 	}

and i get the message in the console, so i assume that for some reason simply the camera is not resized.

[kalwalt]

Testing new node listeners, but actually the code (see node/example.js) can't detect and track the pinball image. If the data passed to the process function it should print that the nft marker is tracked, Instead i got a NftMarkerInfo struct with a not found marker. When i have a bit of time i will try to debug why is not detecting.

[kalwalt]

In regards of the previous comment: this could be caused because artoolkitNFT.NFTMarkerInfo Is not attached to the global scope when It Is passed through the EM_ASM_ inside the getNFTMarkerInfo function (ARToolKitJS.cpp). This Is a reminder when i come back from holiday.

[kalwalt]

I improved the code with a new dist dile specyfic for node, i added two new wxamples but still they can't detect the marker. Initially i thought that i was supplying the imnage data in a wrong way, but i'm not sure of this anymore. There is some bug somewhere in the code, maybe i can add some more debug printings in the C++ code?