Added support for texture encoding for lightMap

src/renderers/shaders/ShaderChunk/lightmap_fragment.glsl.js

@@ -1,7 +1,8 @@
 export default /* glsl */`
 #ifdef USE_LIGHTMAP
 
-	reflectedLight.indirectDiffuse += PI * texture2D( lightMap, vUv2 ).xyz * lightMapIntensity; // factor of PI should not be present; included here to prevent breakage
+	vec4 lightMapTexel= texture2D( lightMap, vUv2 )
+	reflectedLight.indirectDiffuse += PI * lightMapTexelToLinear( lightMapTexel ).rgb * lightMapIntensity; // factor of PI should not be present; included here to prevent breakage
 
 #endif
 `;

src/renderers/webgl/WebGLProgram.js

@@ -628,12 +628,13 @@ function WebGLProgram( renderer, extensions, cacheKey, material, shader, paramet
 
 			parameters.dithering ? '#define DITHERING' : '',
 
-			( parameters.outputEncoding || parameters.mapEncoding || parameters.matcapEncoding || parameters.envMapEncoding || parameters.emissiveMapEncoding ) ?
+			( parameters.outputEncoding || parameters.mapEncoding || parameters.matcapEncoding || parameters.envMapEncoding || parameters.emissiveMapEncoding || parameters.lightMapEncoding ) ?
 				ShaderChunk[ 'encodings_pars_fragment' ] : '', // this code is required here because it is used by the various encoding/decoding function defined below
 			parameters.mapEncoding ? getTexelDecodingFunction( 'mapTexelToLinear', parameters.mapEncoding ) : '',
 			parameters.matcapEncoding ? getTexelDecodingFunction( 'matcapTexelToLinear', parameters.matcapEncoding ) : '',
 			parameters.envMapEncoding ? getTexelDecodingFunction( 'envMapTexelToLinear', parameters.envMapEncoding ) : '',
 			parameters.emissiveMapEncoding ? getTexelDecodingFunction( 'emissiveMapTexelToLinear', parameters.emissiveMapEncoding ) : '',
+			parameters.lightMapEncoding ? getTexelDecodingFunction( 'lightMapTexelToLinear', parameters.lightMapEncoding ) : '',
 			parameters.outputEncoding ? getTexelEncodingFunction( 'linearToOutputTexel', parameters.outputEncoding ) : '',
 
 			parameters.depthPacking ? '#define DEPTH_PACKING ' + material.depthPacking : '',

src/renderers/webgl/WebGLPrograms.js

@@ -37,7 +37,7 @@ function WebGLPrograms( renderer, extensions, capabilities ) {
 	var parameterNames = [
 		"precision", "isWebGL2", "supportsVertexTextures", "outputEncoding", "instancing", "numMultiviewViews",
 		"map", "mapEncoding", "matcap", "matcapEncoding", "envMap", "envMapMode", "envMapEncoding", "envMapCubeUV",
-		"lightMap", "aoMap", "emissiveMap", "emissiveMapEncoding", "bumpMap", "normalMap", "objectSpaceNormalMap", "tangentSpaceNormalMap", "clearcoatNormalMap", "displacementMap", "specularMap",
+		"lightMap", "lightMapEncoding", "aoMap", "emissiveMap", "emissiveMapEncoding", "bumpMap", "normalMap", "objectSpaceNormalMap", "tangentSpaceNormalMap", "clearcoatNormalMap", "displacementMap", "specularMap",
 		"roughnessMap", "metalnessMap", "gradientMap",
 		"alphaMap", "combine", "vertexColors", "vertexTangents", "vertexUvs", "uvsVertexOnly", "fog", "useFog", "fogExp2",
 		"flatShading", "sizeAttenuation", "logarithmicDepthBuffer", "skinning",
@@ -163,6 +163,7 @@ function WebGLPrograms( renderer, extensions, capabilities ) {
 			envMapEncoding: getTextureEncodingFromMap( material.envMap, renderer.gammaInput ),
 			envMapCubeUV: ( !! material.envMap ) && ( ( material.envMap.mapping === CubeUVReflectionMapping ) || ( material.envMap.mapping === CubeUVRefractionMapping ) ),
 			lightMap: !! material.lightMap,
+			lightMapEncoding: getTextureEncodingFromMap( material.lightMap, renderer.gammaInput ),
 			aoMap: !! material.aoMap,
 			emissiveMap: !! material.emissiveMap,
 			emissiveMapEncoding: getTextureEncodingFromMap( material.emissiveMap, renderer.gammaInput ),