Steve Gifford mousebird

Who

Stamen is a design/technology company known for its data visualization and open work (e.g. Stamen Watercolor). SteveG consults for Stamen now and then on mobile and is known for another open source map toolkit (WhirlyGlobe-Maply) which made the transition to Metal years ago.

What

We're floating a proposal with some of Stamen's clients to upgrade MapLibre Native to:

Open up the rendering subsystem in MapLibre Native
Implement a Metal rendering module for iOS / MacOS

	// Add a marker for each point in a list of vectors
	private void insertClusteredMarkers(List<VectorObject> vectors, MaplyBaseController inController)
	{
	// The markers will be 32x32 pixels
	Point2d size = new Point2d(32, 32);
	List<ScreenMarker> markers = new ArrayList<>();
	Bitmap icon = BitmapFactory.decodeResource(getActivity().getResources(), R.drawable.sticker);

	// For each vector object, add a marker in the middle
	for (VectorObject v : vectors) {

	static public CoordSystem MakeBNGCoordSystem(Activity activity, boolean displayVersion)
	{
	String projStr = "+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m +no_defs";
	Proj4CoordSystem coordSys = new Proj4CoordSystem(projStr);

	// Set the bounding box for validity. It assumes it can go everywhere by default
	Mbr bbox = new Mbr();
	bbox.addPoint(new Point2d(1393.0196,13494.9764));
	bbox.addPoint(new Point2d(671196.3657,1230275.0454));

	func addStickers (_ arrayComp: NSArray , baseViewC: MaplyBaseViewController) {

	// Pick up a smiley face image
	let startImage = UIImage(named: "Smiley_Face_Avatar_by_PixelTwist")
	var stickers = [MaplySticker]()

	// Add a sticker for each input point
	for object in arrayComp {
	let sticker = MaplySticker()
	let center = (object as! MaplyVectorObject).center()

	<?xml version="1.0" encoding="UTF-8"?>
	<StyledLayerDescriptor version="1.0.0" xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd" xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<NamedLayer>
	<Name>openstreetmap buildings</Name>
	<UserStyle>
	<Name>normal</Name>
	<FeatureTypeStyle>
	<Rule>
	<MinScaleDenominator>0</MinScaleDenominator>
	<MaxScaleDenominator>13000</MaxScaleDenominator>

	struct VertexArgBufferA {
	const device Uniforms *uniforms [[ id(WKSUniformArgBuffer) ]];
	const device UniformDrawStateA *uniDrawState [[ id(WKSUniformDrawStateArgBuffer) ]];
	};

	// Vertex shader for simple line on the globe
	vertex ProjVertexA vertexLineOnly_globe(
	VertexA vert [[stage_in]],
	const device VertexArgBufferA & vertArgs [[buffer(WKSVertexArgBuffer)]])
	{