WebGLState: Implement true reset.

Author: Mugen87

src/renderers/webgl/WebGLState.js

@@ -318,7 +318,7 @@ function WebGLState( gl, extensions, capabilities ) {
 
 	let currentProgram = null;
 
-	let currentBlendingEnabled = null;
+	let currentBlendingEnabled = false;
 	let currentBlending = null;
 	let currentBlendEquation = null;
 	let currentBlendSrc = null;
@@ -480,7 +480,7 @@ function WebGLState( gl, extensions, capabilities ) {
 
 		if ( blending === NoBlending ) {
 
-			if ( currentBlendingEnabled ) {
+			if ( currentBlendingEnabled === true ) {
 
 				disable( gl.BLEND );
 				currentBlendingEnabled = false;
@@ -491,7 +491,7 @@ function WebGLState( gl, extensions, capabilities ) {
 
 		}
 
-		if ( ! currentBlendingEnabled ) {
+		if ( currentBlendingEnabled === false ) {
 
 			enable( gl.BLEND );
 			currentBlendingEnabled = true;
@@ -877,14 +877,46 @@ function WebGLState( gl, extensions, capabilities ) {
 
 	function reset() {
 
+		// reset state
+
+		gl.disable( gl.BLEND );
+		gl.disable( gl.CULL_FACE );
+		gl.disable( gl.DEPTH_TEST );
+		gl.disable( gl.POLYGON_OFFSET_FILL );
+		gl.disable( gl.SCISSOR_TEST );
+		gl.disable( gl.STENCIL_TEST );
+
+		gl.blendEquation( gl.FUNC_ADD );
+		gl.blendFunc( gl.ONE, gl.ZERO );
+		gl.blendFuncSeparate( gl.ONE, gl.ZERO, gl.ONE, gl.ZERO );
+
+		gl.colorMask( true, true, true, true );
+		gl.clearColor( 0, 0, 0, 0 );
+
+		gl.depthMask( true );
+		gl.depthFunc( gl.LESS );
+		gl.clearDepth( 1 );
+
+		gl.stencilMask( 0xffffffff );
+		gl.stencilFunc( gl.ALWAYS, 0, 1 );
+		gl.stencilOp( gl.KEEP, gl.KEEP, gl.KEEP );
+		gl.clearStencil( 0 );
+
+		gl.cullFace( gl.BACK );
+		gl.frontFace( gl.CCW );
+
+		gl.polygonOffset( 0, 0 );
+
+		// reset internals
+
 		enabledCapabilities = {};
 
 		currentTextureSlot = null;
 		currentBoundTextures = {};
 
 		currentProgram = null;
 
-		currentBlendingEnabled = null;
+		currentBlendingEnabled = false;
 		currentBlending = null;
 		currentBlendEquation = null;
 		currentBlendSrc = null;