Destroy location wrappers when they're unused.

src/gameobjects/shader/Shader.js

@@ -12,6 +12,7 @@ var Extend = require('../../utils/object/Extend');
 var SetValue = require('../../utils/object/SetValue');
 var ShaderRender = require('./ShaderRender');
 var TransformMatrix = require('../components/TransformMatrix');
+var ArrayEach = require('../../utils/array/Each');
 
 /**
  * @classdesc
@@ -1218,6 +1219,12 @@ var Shader = new Class({
             this.glTexture = null;
             this.texture = null;
         }
+
+        ArrayEach(this.uniforms, function (uniform)
+        {
+            renderer.deleteUniformLocation(uniform.uniformLocation);
+            uniform.uniformLocation = null;
+        });
     }
 
 });

src/renderer/webgl/WebGLRenderer.js

@@ -2279,6 +2279,42 @@ var WebGLRenderer = new Class({
         return this;
     },
 
+    /**
+     * Deletes a WebGLAttribLocation from the GL instance.
+     * 
+     * @method Phaser.Renderer.WebGL.WebGLRenderer#deleteAttribLocation
+     * @param {Phaser.Renderer.WebGL.Wrappers.WebGLAttribLocationWrapper} attrib - The attrib location to be deleted.
+     * @since 3.80.0
+     */
+    deleteAttribLocation: function (attrib)
+    {
+        if (attrib)
+        {
+            ArrayRemove(this.glAttribLocationWrappers, attrib);
+            attrib.destroy();
+        }
+
+        return this;
+    },
+
+    /**
+     * Deletes a WebGLUniformLocation from the GL instance.
+     * 
+     * @method Phaser.Renderer.WebGL.WebGLRenderer#deleteUniformLocation
+     * @param {Phaser.Renderer.WebGL.Wrappers.WebGLUniformLocationWrapper} uniform - The uniform location to be deleted.
+     * @since 3.80.0
+     */
+    deleteUniformLocation: function (uniform)
+    {
+        if (uniform)
+        {
+            ArrayRemove(this.glUniformLocationWrappers, uniform);
+            uniform.destroy();
+        }
+
+        return this;
+    },
+
     /**
      * Deletes a WebGLBuffer from the GL instance.
      *

src/renderer/webgl/WebGLShader.js

@@ -5,6 +5,7 @@
  */
 
 var Class = require('../../utils/Class');
+var ArrayEach = require('../../utils/array/Each');
 var GetFastValue = require('../../utils/object/GetFastValue');
 var WEBGL_CONST = require('./const');
 
@@ -1167,14 +1168,25 @@ var WebGLShader = new Class({
      */
     destroy: function ()
     {
-        this.renderer.deleteProgram(this.program);
+        var renderer = this.renderer;
+        ArrayEach(this.uniforms, function (uniform)
+        {
+            renderer.deleteUniformLocation(uniform.location);
+        });
+        this.uniforms = null;
+
+        ArrayEach(this.attributes, function (attrib)
+        {
+            renderer.deleteAttribLocation(attrib.location);
+        });
+        this.attributes = null;
+
+        renderer.deleteProgram(this.program);
 
         this.pipeline = null;
         this.renderer = null;
         this.gl = null;
         this.program = null;
-        this.attributes = null;
-        this.uniforms = null;
     }
 
 });

src/renderer/webgl/typedefs/WebGLPipelineAttribute.js

@@ -8,5 +8,5 @@
  * @property {number} offset - The offset, in bytes, of this attribute data in the vertex array. Equivalent to `offsetof(vertex, attrib)` in C.
  * @property {boolean} normalized - Should the attribute data be normalized?
  * @property {boolean} enabled - You should set this to `false` by default. The pipeline will enable it on boot.
- * @property {number} location - You should set this to `-1` by default. The pipeline will set it on boot.
+ * @property {(-1|Phaser.Renderer.WebGL.Wrappers.WebGLAttribLocationWrapper)} location - You should set this to `-1` by default. The pipeline will set it on boot.
  */