diff --git a/src/core/renderers/webgl/WebGLRenderer.js b/src/core/renderers/webgl/WebGLRenderer.js
index dbb401f..8c0e68f 100644
--- a/src/core/renderers/webgl/WebGLRenderer.js
+++ b/src/core/renderers/webgl/WebGLRenderer.js
@@ -108,7 +108,7 @@
      * @member {WebGLRenderingContext}
      */
     // initialize the context so it is ready for the managers.
-    this.gl = createContext(this.view, this._contextOptions);
+    this.gl = options.context || createContext(this.view, this._contextOptions);
 
     this.CONTEXT_UID = CONTEXT_UID++;
 
@@ -239,7 +239,7 @@
 
     // apply transform..
 
-    this.currentRenderer.flush();
+    this.setObjectRenderer(this.emptyRenderer);
 
     this.emit('postrender');
 };
@@ -279,6 +279,8 @@
  */
 WebGLRenderer.prototype.resize = function (width, height)
 {
+    if(width * this.resolution === this.width && height * this.resolution === this.height)return;
+
     SystemRenderer.prototype.resize.call(this, width, height);
 
     this.rootRenderTarget.resize(width, height);

diff --git a/src/core/renderers/webgl/WebGLRenderer.js b/src/core/renderers/webgl/WebGLRenderer.js
index dbb401f..8c0e68f 100644
--- a/src/core/renderers/webgl/WebGLRenderer.js
+++ b/src/core/renderers/webgl/WebGLRenderer.js
@@ -108,7 +108,7 @@
      * @member {WebGLRenderingContext}
      */
     // initialize the context so it is ready for the managers.
-    this.gl = createContext(this.view, this._contextOptions);
+    this.gl = options.context || createContext(this.view, this._contextOptions);
 
     this.CONTEXT_UID = CONTEXT_UID++;
 
@@ -239,7 +239,7 @@
 
     // apply transform..
 
-    this.currentRenderer.flush();
+    this.setObjectRenderer(this.emptyRenderer);
 
     this.emit('postrender');
 };
@@ -279,6 +279,8 @@
  */
 WebGLRenderer.prototype.resize = function (width, height)
 {
+    if(width * this.resolution === this.width && height * this.resolution === this.height)return;
+
     SystemRenderer.prototype.resize.call(this, width, height);
 
     this.rootRenderTarget.resize(width, height);
diff --git a/src/core/textures/BaseRenderTexture.js b/src/core/textures/BaseRenderTexture.js
index c690dc4..db8d2d8 100644
--- a/src/core/textures/BaseRenderTexture.js
+++ b/src/core/textures/BaseRenderTexture.js
@@ -47,11 +47,6 @@
  */
 function BaseRenderTexture(width, height, scaleMode, resolution)
 {
-    if (!renderer)
-    {
-        throw new Error('Unable to create BaseRenderTexture, you must pass a renderer into the constructor.');
-    }
-
     BaseTexture.call(this, null, scaleMode);
 
     this.width = width || 100;

diff --git a/src/core/renderers/webgl/WebGLRenderer.js b/src/core/renderers/webgl/WebGLRenderer.js
index dbb401f..8c0e68f 100644
--- a/src/core/renderers/webgl/WebGLRenderer.js
+++ b/src/core/renderers/webgl/WebGLRenderer.js
@@ -108,7 +108,7 @@
      * @member {WebGLRenderingContext}
      */
     // initialize the context so it is ready for the managers.
-    this.gl = createContext(this.view, this._contextOptions);
+    this.gl = options.context || createContext(this.view, this._contextOptions);
 
     this.CONTEXT_UID = CONTEXT_UID++;
 
@@ -239,7 +239,7 @@
 
     // apply transform..
 
-    this.currentRenderer.flush();
+    this.setObjectRenderer(this.emptyRenderer);
 
     this.emit('postrender');
 };
@@ -279,6 +279,8 @@
  */
 WebGLRenderer.prototype.resize = function (width, height)
 {
+    if(width * this.resolution === this.width && height * this.resolution === this.height)return;
+
     SystemRenderer.prototype.resize.call(this, width, height);
 
     this.rootRenderTarget.resize(width, height);
diff --git a/src/core/textures/BaseRenderTexture.js b/src/core/textures/BaseRenderTexture.js
index c690dc4..db8d2d8 100644
--- a/src/core/textures/BaseRenderTexture.js
+++ b/src/core/textures/BaseRenderTexture.js
@@ -47,11 +47,6 @@
  */
 function BaseRenderTexture(width, height, scaleMode, resolution)
 {
-    if (!renderer)
-    {
-        throw new Error('Unable to create BaseRenderTexture, you must pass a renderer into the constructor.');
-    }
-
     BaseTexture.call(this, null, scaleMode);
 
     this.width = width || 100;
diff --git a/src/core/textures/RenderTexture.js b/src/core/textures/RenderTexture.js
index 9ea0c33..c5551c4 100644
--- a/src/core/textures/RenderTexture.js
+++ b/src/core/textures/RenderTexture.js
@@ -45,10 +45,6 @@
  */
 function RenderTexture(baseRenderTexture, frame)
 {
-    if (!renderer)
-    {
-        throw new Error('Unable to create RenderTexture, you must pass a renderer into the constructor.');
-    }
 
     /**
      * The base texture object that this texture uses