[v9] Fix GoogleMapsOverlay by not clearing canvas (#8351)

Author: zbigg

modules/core/src/passes/layers-pass.ts

@@ -66,7 +66,7 @@ export default class LayersPass extends Pass {
         viewport: [0, 0, width, height]
       },
       // clear depth and color buffers, restoring transparency
-      clearColor: options.clearColor || (options.clearCanvas ? [0, 0, 0, 0] : undefined),
+      clearColor: options.clearColor ?? (options.clearCanvas ? [0, 0, 0, 0] : false),
       clearDepth: options.clearCanvas ? 1 : undefined
     });
 
@@ -85,8 +85,7 @@ export default class LayersPass extends Pass {
       viewports,
       views,
       onViewportActive,
-      clearStack = true,
-      clearCanvas = true
+      clearStack = true
     } = options;
     options.pass = options.pass || 'unknown';
 

modules/google-maps/src/google-maps-overlay.ts

@@ -242,6 +242,11 @@ export default class GoogleMapsOverlay {
       // @ts-expect-error
       deck.setProps({_framebuffer});
 
+      // With external gl context, animation loop doesn't resize webgl-canvas and thus fails to
+      // calculate corrext pixel ratio. Force this manually.
+      // @ts-expect-error
+      deck.device.canvasContext.resize();
+
       // Camera changed, will trigger a map repaint right after this
       // Clear any change flag triggered by setting viewState so that deck does not request
       // a second repaint