Fix HighlighLayer in additive mode.

src/Layer/babylon.highlightlayer.ts

@@ -133,8 +133,8 @@
         private _vertexBuffers: { [key: string]: VertexBuffer } = {};
         private _indexBuffer: WebGLBuffer;
         private _downSamplePostprocess: PassPostProcess;
-        private _horizontalBlurPostprocess: GlowBlurPostProcess;
-        private _verticalBlurPostprocess: GlowBlurPostProcess;
+        private _horizontalBlurPostprocess: BlurPostProcess;
+        private _verticalBlurPostprocess: BlurPostProcess;
         private _cachedDefines: string;
         private _glowMapGenerationEffect: Effect;
         private _glowMapMergeEffect: Effect;
@@ -352,17 +352,32 @@
                 effect.setTexture("textureSampler", this._mainTexture);
             });
 
-            this._horizontalBlurPostprocess = new GlowBlurPostProcess("HighlightLayerHBP", new BABYLON.Vector2(1.0, 0), this._options.blurHorizontalSize, 1,
-                null, Texture.BILINEAR_SAMPLINGMODE, this._scene.getEngine());
-            this._horizontalBlurPostprocess.onApplyObservable.add(effect => {
-                effect.setFloat2("screenSize", blurTextureWidth, blurTextureHeight);
-            });
-
-            this._verticalBlurPostprocess = new GlowBlurPostProcess("HighlightLayerVBP", new BABYLON.Vector2(0, 1.0), this._options.blurVerticalSize, 1,
+            if (this._options.alphaBlendingMode === Engine.ALPHA_COMBINE) {
+                this._horizontalBlurPostprocess = new GlowBlurPostProcess("HighlightLayerHBP", new BABYLON.Vector2(1.0, 0), this._options.blurHorizontalSize, 1,
+                    null, Texture.BILINEAR_SAMPLINGMODE, this._scene.getEngine());
+                this._horizontalBlurPostprocess.onApplyObservable.add(effect => {
+                    effect.setFloat2("screenSize", blurTextureWidth, blurTextureHeight);
+                });
+
+                this._verticalBlurPostprocess = new GlowBlurPostProcess("HighlightLayerVBP", new BABYLON.Vector2(0, 1.0), this._options.blurVerticalSize, 1,
+                    null, Texture.BILINEAR_SAMPLINGMODE, this._scene.getEngine());
+                this._verticalBlurPostprocess.onApplyObservable.add(effect => {
+                    effect.setFloat2("screenSize", blurTextureWidth, blurTextureHeight);
+                });
+            }
+            else {
+                this._horizontalBlurPostprocess = new BlurPostProcess("HighlightLayerHBP", new BABYLON.Vector2(1.0, 0), this._options.blurHorizontalSize, 1,
                 null, Texture.BILINEAR_SAMPLINGMODE, this._scene.getEngine());
-            this._verticalBlurPostprocess.onApplyObservable.add(effect => {
-                effect.setFloat2("screenSize", blurTextureWidth, blurTextureHeight);
-            });
+                this._horizontalBlurPostprocess.onApplyObservable.add(effect => {
+                    effect.setFloat2("screenSize", blurTextureWidth, blurTextureHeight);
+                });
+
+                this._verticalBlurPostprocess = new BlurPostProcess("HighlightLayerVBP", new BABYLON.Vector2(0, 1.0), this._options.blurVerticalSize, 1,
+                    null, Texture.BILINEAR_SAMPLINGMODE, this._scene.getEngine());
+                this._verticalBlurPostprocess.onApplyObservable.add(effect => {
+                    effect.setFloat2("screenSize", blurTextureWidth, blurTextureHeight);
+                });
+            }
 
             this._mainTexture.onAfterUnbindObservable.add(() => {
                 this.onBeforeBlurObservable.notifyObservers(this);