revert code, included material.extensions in TEXTURE_LOD_EXT

src/renderers/webgl/WebGLProgram.js

@@ -121,7 +121,7 @@ function generateExtensions( extensions, parameters, rendererExtensions ) {
 		( extensions.derivatives || parameters.envMapCubeUV || parameters.bumpMap || ( parameters.normalMap && ! parameters.objectSpaceNormalMap ) || parameters.flatShading ) ? '#extension GL_OES_standard_derivatives : enable' : '',
 		( extensions.fragDepth || parameters.logarithmicDepthBuffer ) && rendererExtensions.get( 'EXT_frag_depth' ) ? '#extension GL_EXT_frag_depth : enable' : '',
 		( extensions.drawBuffers ) && rendererExtensions.get( 'WEBGL_draw_buffers' ) ? '#extension GL_EXT_draw_buffers : require' : '',
-		( extensions.shaderTextureLOD ) && rendererExtensions.get( 'EXT_shader_texture_lod' ) ? '#extension GL_EXT_shader_texture_lod : enable' : ''
+		( extensions.shaderTextureLOD || parameters.envMap ) && rendererExtensions.get( 'EXT_shader_texture_lod' ) ? '#extension GL_EXT_shader_texture_lod : enable' : ''
 	];
 
 	return chunks.filter( filterEmptyLine ).join( '\n' );
@@ -525,7 +525,7 @@ function WebGLProgram( renderer, extensions, code, material, shader, parameters,
 			parameters.logarithmicDepthBuffer ? '#define USE_LOGDEPTHBUF' : '',
 			parameters.logarithmicDepthBuffer && ( capabilities.isWebGL2 || extensions.get( 'EXT_frag_depth' ) ) ? '#define USE_LOGDEPTHBUF_EXT' : '',
 
-			( capabilities.isWebGL2 || extensions.get( 'EXT_shader_texture_lod' ) ) ? '#define TEXTURE_LOD_EXT' : '',
+			( ( ! material.extensions || material.extensions.shaderTextureLOD ) || parameters.envMap ) && ( capabilities.isWebGL2 || extensions.get( 'EXT_shader_texture_lod' ) ) ? '#define TEXTURE_LOD_EXT' : '',
 
 			'uniform mat4 viewMatrix;',
 			'uniform vec3 cameraPosition;',