Merge pull request #51577 from m4gr3d/update_external_texture_config

Update external texture flag configuration.

doc/classes/ExternalTexture.xml

@@ -18,7 +18,7 @@
 		</method>
 	</methods>
 	<members>
-		<member name="flags" type="int" setter="set_flags" getter="get_flags" override="true" default="0" />
+		<member name="flags" type="int" setter="set_flags" getter="get_flags" override="true" default="2048" />
 		<member name="size" type="Vector2" setter="set_size" getter="get_size" default="Vector2( 1, 1 )">
 			External texture size.
 		</member>

scene/resources/texture.cpp

@@ -2610,15 +2610,14 @@ void ExternalTexture::set_flags(uint32_t p_flags) {
 }
 
 uint32_t ExternalTexture::get_flags() const {
-	// not supported
-	return 0;
+	return Texture::FLAG_VIDEO_SURFACE;
 }
 
 ExternalTexture::ExternalTexture() {
 	size = Size2(1.0, 1.0);
 	texture = VisualServer::get_singleton()->texture_create();
 
-	VisualServer::get_singleton()->texture_allocate(texture, size.width, size.height, 0, Image::FORMAT_RGBA8, VS::TEXTURE_TYPE_EXTERNAL, 0);
+	VisualServer::get_singleton()->texture_allocate(texture, size.width, size.height, 0, Image::FORMAT_RGBA8, VS::TEXTURE_TYPE_EXTERNAL, Texture::FLAG_VIDEO_SURFACE);
 	_change_notify();
 	emit_changed();
 }