From 4acb45dc781a6aefc642c34afb489449a7bbbb33 Mon Sep 17 00:00:00 2001
From: mike-000 <49240900+mike-000@users.noreply.github.com>
Date: Tue, 21 Dec 2021 17:07:57 +0000
Subject: [PATCH] include layer opacity in shader

---
 src/ol/layer/Heatmap.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/ol/layer/Heatmap.js b/src/ol/layer/Heatmap.js
index 2b41e56d37..5c9066a1eb 100644
--- a/src/ol/layer/Heatmap.js
+++ b/src/ol/layer/Heatmap.js
@@ -285,12 +285,13 @@ class Heatmap extends BaseVector {
 
             uniform sampler2D u_image;
             uniform sampler2D u_gradientTexture;
+            uniform float u_opacity;
 
             varying vec2 v_texCoord;
 
             void main() {
               vec4 color = texture2D(u_image, v_texCoord);
-              gl_FragColor.a = color.a;
+              gl_FragColor.a = color.a * u_opacity;
               gl_FragColor.rgb = texture2D(u_gradientTexture, vec2(0.5, color.a)).rgb;
               gl_FragColor.rgb *= gl_FragColor.a;
             }`,
@@ -298,6 +299,9 @@ class Heatmap extends BaseVector {
             u_gradientTexture: function () {
               return this.gradient_;
             }.bind(this),
+            u_opacity: function () {
+              return this.getOpacity();
+            }.bind(this),
           },
         },
       ],