Allow WebGL tile layer style to be updated

src/ol/webgl/Helper.js

@@ -340,7 +340,6 @@ class WebGLHelper extends Disposable {
      * @type {WebGLRenderingContext}
      */
     this.gl_ = getContext(this.canvas_);
-    const gl = this.getGL();
 
     /**
      * @private
@@ -407,14 +406,11 @@ class WebGLHelper extends Disposable {
      */
     this.uniforms_ = [];
     if (options.uniforms) {
-      for (const name in options.uniforms) {
-        this.uniforms_.push({
-          name: name,
-          value: options.uniforms[name],
-        });
-      }
+      this.setUniforms(options.uniforms);
     }
 
+    const gl = this.getGL();
+
     /**
      * An array of PostProcessingPass objects is kept in this variable, built from the steps provided in the
      * options. If no post process was given, a default one is used (so as not to have to make an exception to
@@ -447,6 +443,20 @@ class WebGLHelper extends Disposable {
     this.startTime_ = Date.now();
   }
 
+  /**
+   * @param {Object<string, UniformValue>} uniforms Uniform definitions.
+   */
+  setUniforms(uniforms) {
+    this.uniforms_ = [];
+    for (const name in uniforms) {
+      this.uniforms_.push({
+        name: name,
+        value: uniforms[name],
+      });
+    }
+    this.uniformLocations_ = {};
+  }
+
   /**
    * @param {string} canvasCacheKey The canvas cache key.
    * @return {boolean} The provided key matches the one this helper was constructed with.