fix flipped ortophot + clear cache

editor/editorOrthophoto.cpp

@@ -417,6 +417,9 @@ bool fetch(http_client &Client, std::string const &Url, fs::path const &Path, st
 bool decode(std::vector<std::uint8_t> const &Data, image &Out, std::string &Error)
 {
 	int width{0}, height{0}, components{0};
+	// WMS GetMap is north-up. the texture loader sets a process-wide stb flip for OpenGL;
+	// pin this thread to no flip immediately before load so the first row stays north
+	stbi_set_flip_vertically_on_load_thread(0);
 	stbi_uc *pixels = stbi_load_from_memory(Data.data(), static_cast<int>(Data.size()), &width, &height, &components, 4);
 	if (pixels == nullptr)
 	{
@@ -738,6 +741,21 @@ void editor_orthophoto::cancel_pending()
 		entry.second.requested = 0;
 }
 
+void editor_orthophoto::clear_cache()
+{
+	cancel_pending();
+	for (auto &entry : m_tiles)
+		release_tile(entry.second);
+	m_tiles.clear();
+	++m_generation;
+	{
+		std::lock_guard<std::mutex> lock(m_mutex);
+		m_done.clear();
+	}
+	std::error_code ec;
+	fs::remove_all(cache_root(), ec);
+}
+
 void editor_orthophoto::retry_failed()
 {
 	for (auto &entry : m_tiles)

editor/editorOrthophoto.hpp

@@ -107,6 +107,8 @@ class editor_orthophoto
 	void draw(glm::mat4 const &ViewProjection, glm::dvec3 const &CameraPos, float ScreenWidth, float ScreenHeight) const;
 	// forgets pending (not yet started) downloads, e.g. when the editor is left
 	void cancel_pending();
+	// drops resident tiles and deletes the on-disk cache; enabled tiles are fetched again
+	void clear_cache();
 	// clears failure state so failed tiles are attempted again
 	void retry_failed();