Fix MaskPass not locking the stencil buffer, lock stencil buffer test state

examples/js/postprocessing/MaskPass.js

@@ -55,6 +55,7 @@ THREE.MaskPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ),
 		state.buffers.stencil.setOp( context.REPLACE, context.REPLACE, context.REPLACE );
 		state.buffers.stencil.setFunc( context.ALWAYS, writeValue, 0xffffffff );
 		state.buffers.stencil.setClear( clearValue );
+		state.buffers.stencil.setLocked( true );
 
 		// draw into the stencil buffer
 
@@ -73,8 +74,10 @@ THREE.MaskPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ),
 
 		// only render where stencil is set to 1
 
+		state.buffers.stencil.setLocked( false );
 		state.buffers.stencil.setFunc( context.EQUAL, 1, 0xffffffff ); // draw if == 1
 		state.buffers.stencil.setOp( context.KEEP, context.KEEP, context.KEEP );
+		state.buffers.stencil.setLocked( true );
 
 	}
 
@@ -95,6 +98,7 @@ Object.assign( THREE.ClearMaskPass.prototype, {
 
 	render: function ( renderer /*, writeBuffer, readBuffer, deltaTime, maskActive */ ) {
 
+		state.buffers.stencil.setLocked( false );
 		renderer.state.buffers.stencil.setTest( false );
 
 	}

examples/jsm/postprocessing/MaskPass.js

@@ -58,6 +58,7 @@ MaskPass.prototype = Object.assign( Object.create( Pass.prototype ), {
 		state.buffers.stencil.setOp( context.REPLACE, context.REPLACE, context.REPLACE );
 		state.buffers.stencil.setFunc( context.ALWAYS, writeValue, 0xffffffff );
 		state.buffers.stencil.setClear( clearValue );
+		state.buffers.stencil.setLocked( true );
 
 		// draw into the stencil buffer
 
@@ -76,8 +77,10 @@ MaskPass.prototype = Object.assign( Object.create( Pass.prototype ), {
 
 		// only render where stencil is set to 1
 
+		state.buffers.stencil.setLocked( false );
 		state.buffers.stencil.setFunc( context.EQUAL, 1, 0xffffffff ); // draw if == 1
 		state.buffers.stencil.setOp( context.KEEP, context.KEEP, context.KEEP );
+		state.buffers.depth.setLocked( true );
 
 	}
 
@@ -98,6 +101,7 @@ Object.assign( ClearMaskPass.prototype, {
 
 	render: function ( renderer /*, writeBuffer, readBuffer, deltaTime, maskActive */ ) {
 
+		renderer.state.buffers.stencil.setLocked( false );
 		renderer.state.buffers.stencil.setTest( false );
 
 	}

src/renderers/webgl/WebGLState.js

@@ -215,13 +215,17 @@ function WebGLState( gl, extensions, utils, capabilities ) {
 
 			setTest: function ( stencilTest ) {
 
-				if ( stencilTest ) {
+				if ( ! locked ) {
 
-					enable( gl.STENCIL_TEST );
+					if ( stencilTest ) {
 
-				} else {
+						enable( gl.STENCIL_TEST );
+
+					} else {
 
-					disable( gl.STENCIL_TEST );
+						disable( gl.STENCIL_TEST );
+
+					}
 
 				}