WebGLRenderer: Avoid unnecesary gl state resets at plugin render time. See #4628.

src/extras/renderers/plugins/LensFlarePlugin.js

@@ -283,6 +283,8 @@ THREE.LensFlarePlugin = function () {
 		_gl.enable( _gl.DEPTH_TEST );
 		_gl.depthMask( true );
 
+		_renderer.resetGLState();
+
 	};
 
 	function createProgram ( shader, precision ) {

src/extras/renderers/plugins/ShadowMapPlugin.js

@@ -45,7 +45,7 @@ THREE.ShadowMapPlugin = function () {
 
 	this.render = function ( scene, camera ) {
 
-		if ( ! ( _renderer.shadowMapEnabled && _renderer.shadowMapAutoUpdate ) ) return;
+		if ( _renderer.shadowMapEnabled === false || _renderer.shadowMapAutoUpdate === false ) return;
 
 		this.update( scene, camera );
 
@@ -330,6 +330,8 @@ THREE.ShadowMapPlugin = function () {
 
 		}
 
+		_renderer.resetGLState();
+
 	};
 	
 	function projectObject(scene, object,shadowCamera){

src/renderers/WebGLRenderer.js

@@ -412,6 +412,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 	this.addPostPlugin = function ( plugin ) {
 
 		plugin.init( this, lights, _webglObjects, _webglObjectsImmediate );
+
 		this.renderPluginsPost.push( plugin );
 
 	};
@@ -419,6 +420,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 	this.addPrePlugin = function ( plugin ) {
 
 		plugin.init( this, lights, _webglObjects, _webglObjectsImmediate );
+
 		this.renderPluginsPre.push( plugin );
 
 	};
@@ -3150,7 +3152,6 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 	};
 
-
 	// Rendering
 
 	this.render = function ( scene, camera, renderTarget, forceClear ) {
@@ -3371,38 +3372,8 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		for ( var i = 0, il = plugins.length; i < il; i ++ ) {
 
-			// reset state for plugin (to start from clean slate)
-
-			_currentProgram = null;
-			_currentCamera = null;
-
-			_oldBlending = - 1;
-			_oldDepthTest = - 1;
-			_oldDepthWrite = - 1;
-			_oldDoubleSided = - 1;
-			_oldFlipSided = - 1;
-			_currentGeometryGroupHash = - 1;
-			_currentMaterialId = - 1;
-
-			_lightsNeedUpdate = true;
-
 			plugins[ i ].render( scene, camera, _currentWidth, _currentHeight );
 
-			// reset state after plugin (anything could have changed)
-
-			_currentProgram = null;
-			_currentCamera = null;
-
-			_oldBlending = - 1;
-			_oldDepthTest = - 1;
-			_oldDepthWrite = - 1;
-			_oldDoubleSided = - 1;
-			_oldFlipSided = - 1;
-			_currentGeometryGroupHash = - 1;
-			_currentMaterialId = - 1;
-
-			_lightsNeedUpdate = true;
-
 		}
 
 	};
@@ -6242,7 +6213,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		}
 
-	};
+	}
 
 	function setDefaultGLState () {
 
@@ -6265,7 +6236,26 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 		_gl.clearColor( _clearColor.r, _clearColor.g, _clearColor.b, _clearAlpha );
 
-	};
+	}
+
+	function resetGLState() {
+
+		_currentProgram = null;
+		_currentCamera = null;
+
+		_oldBlending = - 1;
+		_oldDepthTest = - 1;
+		_oldDepthWrite = - 1;
+		_oldDoubleSided = - 1;
+		_oldFlipSided = - 1;
+		_currentGeometryGroupHash = - 1;
+		_currentMaterialId = - 1;
+
+		_lightsNeedUpdate = true;
+
+	}
+
+	this.resetGLState = resetGLState;
 
 	// default plugins (order is important)