Merge pull request #18378 from WestLangley/dev_webgl_background

WebGLBackground: recompile background material when tone mapping changes

src/renderers/webgl/WebGLBackground.js

@@ -22,6 +22,7 @@ function WebGLBackground( renderer, state, objects, premultipliedAlpha ) {
 	// so we can recompile the material accordingly.
 	var currentBackground = null;
 	var currentBackgroundVersion = 0;
+	var currentTonemapping = null;
 
 	function render( renderList, scene, camera, forceClear ) {
 
@@ -108,12 +109,14 @@ function WebGLBackground( renderer, state, objects, premultipliedAlpha ) {
 			boxMesh.material.uniforms.flipEnvMap.value = texture.isCubeTexture ? - 1 : 1;
 
 			if ( currentBackground !== background ||
-			     currentBackgroundVersion !== texture.version ) {
+				currentBackgroundVersion !== texture.version ||
+				currentTonemapping !== renderer.toneMapping ) {
 
 				boxMesh.material.needsUpdate = true;
 
 				currentBackground = background;
 				currentBackgroundVersion = texture.version;
+				currentTonemapping = renderer.toneMapping;
 
 			}
 
@@ -166,12 +169,14 @@ function WebGLBackground( renderer, state, objects, premultipliedAlpha ) {
 			planeMesh.material.uniforms.uvTransform.value.copy( background.matrix );
 
 			if ( currentBackground !== background ||
-				   currentBackgroundVersion !== background.version ) {
+				currentBackgroundVersion !== background.version ||
+				currentTonemapping !== renderer.toneMapping ) {
 
 				planeMesh.material.needsUpdate = true;
 
 				currentBackground = background;
 				currentBackgroundVersion = background.version;
+				currentTonemapping = renderer.toneMapping;
 
 			}