fix level mipmap and support compressed tex (#27313)

src/renderers/WebGLRenderer.js

@@ -2445,7 +2445,7 @@ class WebGLRenderer {
 				textures.setTexture3D( dstTexture, 0 );
 				glTarget = _gl.TEXTURE_3D;
 
-			} else if ( dstTexture.isDataArrayTexture ) {
+			} else if ( dstTexture.isDataArrayTexture || dstTexture.isCompressedArrayTexture ) {
 
 				textures.setTexture2DArray( dstTexture, 0 );
 				glTarget = _gl.TEXTURE_2D_ARRAY;
@@ -2467,7 +2467,7 @@ class WebGLRenderer {
 			const unpackSkipRows = _gl.getParameter( _gl.UNPACK_SKIP_ROWS );
 			const unpackSkipImages = _gl.getParameter( _gl.UNPACK_SKIP_IMAGES );
 
-			const image = srcTexture.isCompressedTexture ? srcTexture.mipmaps[ 0 ] : srcTexture.image;
+			const image = srcTexture.isCompressedTexture ? srcTexture.mipmaps[ level ] : srcTexture.image;
 
 			_gl.pixelStorei( _gl.UNPACK_ROW_LENGTH, image.width );
 			_gl.pixelStorei( _gl.UNPACK_IMAGE_HEIGHT, image.height );