Function render

modules/arcgis/src/commons.ts:154–250

(
  resources: RenderResources,
  viewport: {
    width: number;
    height: number;
    longitude: number;
    latitude: number;
    zoom: number;
    altitude?: number;
    pitch: number;
    bearing: number;
    views?: unknown;
    viewState?: unknown;
  }
)

}

export function render(
  resources: RenderResources,
  viewport: {
    width: number;
    height: number;
    longitude: number;
    latitude: number;
    zoom: number;
    altitude?: number;
    pitch: number;
    bearing: number;
    views?: unknown;
    viewState?: unknown;
  }
) {
  const {model, deck, fbo} = resources;
  const device = model.device;
  if (device instanceof WebGLDevice) {
    // @ts-ignore device.getParametersWebGL should return `any` not `void`?
    const rawScreenFbo: WebGLFramebuffer | null = device.getParametersWebGL(GL.FRAMEBUFFER_BINDING);
    const {width, height, views, viewState, ...defaultViewState} = viewport;

    /* global window */
    const dpr = window.devicePixelRatio;
    const pixelWidth = Math.round(width * dpr);
    const pixelHeight = Math.round(height * dpr);

    fbo.resize({width: pixelWidth, height: pixelHeight});

    // luma's Framebuffer.resize() clones and destroys the color attachment texture when
    // dimensions change, leaving the cached texture reference and the model sampler binding
    // pointing at a destroyed GPU handle. Re-sync if the attachment was replaced.
    const currentTexture =
      (fbo.colorAttachments[0] as any).texture ?? (fbo.colorAttachments[0] as unknown as Texture);
    if (currentTexture !== resources.texture) {
      resources.texture = currentTexture;
      (model as any).setBindings({deckglTexture: currentTexture});
    }

    // Pass CSS pixel dimensions — deck handles DPR internally. Passing physical
    // pixels would double-apply DPR and project layer geometry off-screen.
    // Without width/height, deck's viewport aspect diverges from ArcGIS's,
    // causing the overlay to drift off the ground plane under tilt/rotation.
    const deckProps: any = {
      width,
      height,
      viewState: viewState || defaultViewState
    };
    if (views) {
      deckProps.views = views;
    }
    deck.setProps(deckProps);
    // redraw deck immediately into deckFbo
    deck.redraw('arcgis');

    // We overlay the texture on top of the map using the full-screen quad.
    const {gl} = device;