Initial commit

backends/plugins/sdl/sdl-provider.cpp

@@ -0,0 +1,92 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "common/scummsys.h"
+
+// RiscOS uses its own plugin provider and SDL one doesn't work
+#if defined(DYNAMIC_MODULES) && defined(SDL_BACKEND)
+
+#include "backends/plugins/sdl/sdl-provider.h"
+#include "backends/plugins/dynamic-plugin.h"
+#include "common/fs.h"
+
+#include "backends/platform/sdl/sdl-sys.h"
+
+class SDLPlugin : public DynamicPlugin {
+protected:
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+	SDL_SharedObject *_dlHandle;
+#else
+	void *_dlHandle;
+#endif
+
+	virtual VoidFunc findSymbol(const char *symbol) {
+#if SDL_VERSION_ATLEAST(3, 0, 0)
+		SDL_FunctionPointer func;
+#else
+		void *func ;
+#endif
+		func = SDL_LoadFunction(_dlHandle, symbol);
+		if (!func)
+			warning("Failed loading symbol '%s' from plugin '%s' (%s)", symbol, _filename.toString(Common::Path::kNativeSeparator).c_str(), SDL_GetError());
+
+		// FIXME HACK: This is a HACK to circumvent a clash between the ISO C++
+		// standard and POSIX: ISO C++ disallows casting between function pointers
+		// and data pointers, but dlsym always returns a void pointer. For details,
+		// see e.g. <https://web.archive.org/web/20061205092618/http://www.trilithium.com/johan/2004/12/problem-with-dlsym/>.
+		assert(sizeof(VoidFunc) == sizeof(func));
+		VoidFunc tmp;
+		memcpy(&tmp, &func, sizeof(VoidFunc));
+		return tmp;
+	}
+
+public:
+	SDLPlugin(const Common::Path &filename)
+		: DynamicPlugin(filename), _dlHandle(0) {}
+
+	bool loadPlugin() {
+		assert(!_dlHandle);
+		_dlHandle = SDL_LoadObject(_filename.toString(Common::Path::kNativeSeparator).c_str());
+
+		if (!_dlHandle) {
+			warning("Failed loading plugin '%s' (%s)", _filename.toString(Common::Path::kNativeSeparator).c_str(), SDL_GetError());
+			return false;
+		}
+
+		return DynamicPlugin::loadPlugin();
+	}
+
+	void unloadPlugin() {
+		DynamicPlugin::unloadPlugin();
+		if (_dlHandle) {
+			SDL_UnloadObject(_dlHandle);
+			_dlHandle = 0;
+		}
+	}
+};
+
+
+Plugin* SDLPluginProvider::createPlugin(const Common::FSNode &node) const {
+	return new SDLPlugin(node.getPath());
+}
+
+
+#endif // defined(DYNAMIC_MODULES) && defined(SDL_BACKEND)