Merge pull request #15568 from Mugen87/dev21

WebGLShadowMap: Fix blending bug

Author: mrdoob

src/renderers/webgl/WebGLShadowMap.js

@@ -3,7 +3,7 @@
  * @author mrdoob / http://mrdoob.com/
  */
 
-import { FrontSide, BackSide, DoubleSide, RGBAFormat, NearestFilter, PCFShadowMap, RGBADepthPacking } from '../../constants.js';
+import { FrontSide, BackSide, DoubleSide, RGBAFormat, NearestFilter, PCFShadowMap, RGBADepthPacking, NoBlending } from '../../constants.js';
 import { WebGLRenderTarget } from '../WebGLRenderTarget.js';
 import { MeshDepthMaterial } from '../../materials/MeshDepthMaterial.js';
 import { MeshDistanceMaterial } from '../../materials/MeshDistanceMaterial.js';
@@ -100,12 +100,10 @@ function WebGLShadowMap( _renderer, _objects, maxTextureSize ) {
 
 		if ( lights.length === 0 ) return;
 
-		// TODO Clean up (needed in case of contextlost)
-		var _gl = _renderer.context;
 		var _state = _renderer.state;
 
 		// Set GL state for depth map.
-		_state.disable( _gl.BLEND );
+		_state.setBlending( NoBlending );
 		_state.buffers.color.setClear( 1, 1, 1, 1 );
 		_state.buffers.depth.setTest( true );
 		_state.setScissorTest( false );