From be8d2843cdda330683a7eda9eb5c513e6f0daa1f Mon Sep 17 00:00:00 2001
From: Tim Schaub <tim.schaub@gmail.com>
Date: Tue, 16 Aug 2022 16:31:02 -0600
Subject: [PATCH] Avoid append only cache in WebGL tile layers

---
 src/ol/renderer/webgl/TileLayer.js           |  1 +
 test/browser/spec/ol/layer/WebGLTile.test.js | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/ol/renderer/webgl/TileLayer.js b/src/ol/renderer/webgl/TileLayer.js
index 4833fba2e6..5de570b2c8 100644
--- a/src/ol/renderer/webgl/TileLayer.js
+++ b/src/ol/renderer/webgl/TileLayer.js
@@ -674,6 +674,7 @@ class WebGLTileLayerRenderer extends WebGLLayerRenderer {
      * @param {import("../../Map.js").FrameState} frameState Frame state.
      */
     const postRenderFunction = function (map, frameState) {
+      tileSource.updateCacheSize(0.1, frameState.viewState.projection);
       tileSource.expireCache(frameState.viewState.projection, empty);
     };
 
diff --git a/test/browser/spec/ol/layer/WebGLTile.test.js b/test/browser/spec/ol/layer/WebGLTile.test.js
index e9293dfa89..a17bb1aae5 100644
--- a/test/browser/spec/ol/layer/WebGLTile.test.js
+++ b/test/browser/spec/ol/layer/WebGLTile.test.js
@@ -1,5 +1,6 @@
 import DataTileSource from '../../../../../src/ol/source/DataTile.js';
 import Map from '../../../../../src/ol/Map.js';
+import OSM from '../../../../../src/ol/source/OSM.js';
 import TileWMS from '../../../../../src/ol/source/TileWMS.js';
 import View from '../../../../../src/ol/View.js';
 import WebGLHelper from '../../../../../src/ol/webgl/Helper.js';
@@ -269,6 +270,19 @@ describe('ol/layer/WebGLTile', function () {
     });
   });
 
+  describe('caching', () => {
+    it('updates the size of the tile cache on the source ', (done) => {
+      const source = new OSM();
+      const spy = sinon.spy(source, 'updateCacheSize');
+      const layer = new WebGLTileLayer({source: source});
+      map.addLayer(layer);
+      map.once('rendercomplete', () => {
+        expect(spy.called).to.be(true);
+        done();
+      });
+    });
+  });
+
   it('creates fragment and vertex shaders', function () {
     const compileShaderSpy = sinon.spy(WebGLHelper.prototype, 'compileShader');
     const renderer = layer.getRenderer();