From 335b86f34289f71849d20226fb740b89a799b274 Mon Sep 17 00:00:00 2001
From: phoboslab <dominic@phoboslab.org>
Date: Sun, 1 Dec 2019 17:21:49 +0100
Subject: [PATCH] Attempt to cleanly free WebGL context

---
 src/webgl.js | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/webgl.js b/src/webgl.js
index ab7b362c..e1c25eb5 100644
--- a/src/webgl.js
+++ b/src/webgl.js
@@ -65,13 +65,15 @@ var WebGLRenderer = function(options) {
 WebGLRenderer.prototype.destroy = function() {
 	var gl = this.gl;
 	
-	gl.deleteTexture(this.textureY);
-	gl.deleteTexture(this.textureCb);
-	gl.deleteTexture(this.textureCr);
+	this.deleteTexture(gl.TEXTURE0, this.textureY);
+	this.deleteTexture(gl.TEXTURE1, this.textureCb);
+	this.deleteTexture(gl.TEXTURE2, this.textureCr);
 
+	gl.useProgram(null);
 	gl.deleteProgram(this.program);
 	gl.deleteProgram(this.loadingProgram);
 
+	gl.bindBuffer(gl.ARRAY_BUFFER, null);
 	gl.deleteBuffer(this.vertexBuffer);
 
 	gl.getExtension('WEBGL_lose_context').loseContext();
@@ -197,7 +199,14 @@ WebGLRenderer.prototype.updateTexture = function(unit, texture, w, h, data) {
 			gl.LUMINANCE, gl.UNSIGNED_BYTE, data
 		);
 	}
-}
+};
+
+WebGLRenderer.prototype.deleteTexture = function(unit, texture) {
+	var gl = this.gl;
+	gl.activeTexture(unit);
+	gl.bindTexture(gl.TEXTURE_2D, null);
+	gl.deleteTexture(texture);
+};
 
 WebGLRenderer.IsSupported = function() {
 	try {