Function getViewport

modules/mapbox/src/deck-utils.ts:276–303

(deck: Deck, map: Map, renderParameters?: unknown)

};

function getViewport(deck: Deck, map: Map, renderParameters?: unknown): Viewport | null {
  const viewState = getViewState(map);
  // View is always MapView or GlobeView in this context
  const view = (deck.getView(MAPBOX_VIEW_ID) || getDefaultView(map)) as MapView | GlobeView;

  if (renderParameters) {
    // Called from MapboxLayerGroup.render
    // Magic number, matches mapbox-gl@>=1.3.0's projection matrix
    view.props.nearZMultiplier = 0.2;
  }

  // Get the base map near/far plane
  // renderParameters is maplibre API but not mapbox
  // Transform is not an official API, properties could be undefined for older versions
  const nearZ = (renderParameters as MaplibreRenderParameters)?.nearZ ?? map.transform._nearZ;
  const farZ = (renderParameters as MaplibreRenderParameters)?.farZ ?? map.transform._farZ;
  if (Number.isFinite(nearZ)) {
    viewState.nearZ = nearZ / map.transform.height;
    viewState.farZ = farZ / map.transform.height;
  }
  // Otherwise fallback to default calculation using nearZMultiplier/farZMultiplier

  return view.makeViewport({
    width: deck.width,
    height: deck.height,
    viewState
  });
}

function afterRender(deck: Deck, map: Map): void {
  // Draw non-Mapbox layers (layers that don't have a corresponding MapboxLayerGroup on the map)