EU7 scenery format and models streaming

scene/eu7/eu7_bake.h

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+/*
+This Source Code Form is subject to the
+terms of the Mozilla Public License, v.
+2.0. If a copy of the MPL was not
+distributed with this file, You can
+obtain one at
+http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include <string>
+
+namespace scene::eu7 {
+
+struct Eu7BakeOutcome {
+    bool ok { false };
+    bool regenerated { false };
+    std::string message;
+};
+
+// Czy wejscie to tekst SCM/SCN bez gotowego .eu7 przy wlaczonym auto-bake.
+[[nodiscard]] bool
+scenario_needs_eu7_regen( std::string const &ScenarioFile );
+
+// Przed ladowaniem mapy: uzyj istniejacego <stem>.eu7 lub wygeneruj cale drzewo include.
+[[nodiscard]] Eu7BakeOutcome
+ensure_scenario_eu7( std::string const &ScenarioFile );
+
+} // namespace scene::eu7