Merge pull request #19087 from sciecode/dev-pmrem-data

PMREMGenerator: set internal/output render targets as RGBE.

src/extras/PMREMGenerator.js

@@ -230,9 +230,9 @@ PMREMGenerator.prototype = {
 			magFilter: NearestFilter,
 			minFilter: NearestFilter,
 			generateMipmaps: false,
-			type: equirectangular ? equirectangular.type : UnsignedByteType,
-			format: equirectangular ? equirectangular.format : RGBEFormat,
-			encoding: equirectangular ? equirectangular.encoding : RGBEEncoding,
+			type: UnsignedByteType,
+			format: RGBEFormat,
+			encoding: _isLDR( equirectangular ) ? equirectangular.encoding : RGBEEncoding,
 			depthBuffer: false,
 			stencilBuffer: false
 		};
@@ -358,7 +358,7 @@ PMREMGenerator.prototype = {
 		}
 
 		uniforms[ 'inputEncoding' ].value = ENCODINGS[ texture.encoding ];
-		uniforms[ 'outputEncoding' ].value = ENCODINGS[ texture.encoding ];
+		uniforms[ 'outputEncoding' ].value = ENCODINGS[ cubeUVRenderTarget.texture.encoding ];
 
 		_setViewport( cubeUVRenderTarget, 0, 0, 3 * SIZE_MAX, 2 * SIZE_MAX );
 
@@ -505,6 +505,14 @@ PMREMGenerator.prototype = {
 
 };
 
+function _isLDR( texture ) {
+
+	if ( texture === undefined || texture.type !== UnsignedByteType ) return false;
+
+	return texture.encoding === LinearEncoding || texture.encoding === sRGBEncoding || texture.encoding === GammaEncoding;
+
+}
+
 function _createPlanes() {
 
 	var _lodPlanes = [];