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backends/platform/libretro/include/libretro-os.h

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+/* Copyright (C) 2023 Giovanni Cascione <ing.cascione@gmail.com>
+ *
+ * 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/>.
+ *
+ */
+#ifndef BACKENDS_LIBRETRO_OS_H
+#define BACKENDS_LIBRETRO_OS_H
+
+#include "audio/mixer_intern.h"
+#include "base/main.h"
+//#include "backends/base-backend.h"
+#include "common/system.h"
+#include "common/mutex.h"
+#include "common/list.h"
+#include "common/events.h"
+#include "backends/modular-backend.h"
+#include "graphics/managed_surface.h"
+
+#define BASE_CURSOR_SPEED 4
+#define CURSOR_STATUS_DOING_JOYSTICK  (1 << 0)
+#define CURSOR_STATUS_DOING_MOUSE     (1 << 1)
+#define CURSOR_STATUS_DOING_X         (1 << 2)
+#define CURSOR_STATUS_DOING_Y         (1 << 3)
+#define CURSOR_STATUS_DOING_SLOWER    (1 << 4)
+
+#define LIBRETRO_G_SYSTEM dynamic_cast<OSystem_libretro *>(g_system)
+
+/**
+ *  Dummy mutex implementation
+ */
+class LibretroMutexInternal final : public Common::MutexInternal {
+public:
+	LibretroMutexInternal() {};
+	~LibretroMutexInternal() override {};
+	bool lock() override {
+		return 0;
+	}
+	bool unlock() override {
+		return 0;
+	};
+};
+
+class OSystem_libretro : public EventsBaseBackend, public ModularGraphicsBackend {
+private:
+	int _relMouseX;
+	int _relMouseY;
+	float _mouseXAcc;
+	float _mouseYAcc;
+	float _dpadXAcc;
+	float _dpadYAcc;
+	float _dpadXVel;
+	float _dpadYVel;
+	float _adjusted_cursor_speed;
+	float _inverse_acceleration_time;
+	uint32 _startTime;
+	uint8 _cursorStatus;
+	Common::String s_systemDir;
+	Common::String s_saveDir;
+	Common::String s_playlistDir;
+	Common::List<Common::Event> _events;
+
+public:
+	Audio::MixerImpl *_mixer;
+	bool _mouseButtons[2];
+	bool _ptrmouseButton;
+	int _mouseX;
+	int _mouseY;
+
+	/* Base */
+	OSystem_libretro(void);
+	~OSystem_libretro(void) override;
+	void initBackend(void) override;
+	void engineInit(void) override;
+	void refreshRetroSettings(void);
+	void refreshScreen(void);
+	void destroy(void);
+	void quit() override {}
+	void resetGraphicsManager(void);
+	void getScreen(const Graphics::ManagedSurface *&screen);
+	int16 getScreenWidth(void);
+	int16 getScreenHeight(void);
+	bool inLauncher(void);
+
+#ifdef USE_OPENGL
+	void resetGraphicsContext(void);
+#ifdef USE_GLAD
+	void *getOpenGLProcAddress(const char *name) const override;
+#endif
+#endif
+
+	/* Events */
+public:
+	bool pollEvent(Common::Event &event) override;
+	uint32 getMillis(bool skipRecord = false) override;
+	void delayMillis(uint msecs) override;
+	Common::MutexInternal *createMutex(void) override;
+	void requestQuit(void);
+	void resetQuit(void);
+	void setMousePosition(int x, int y);
+
+	/* Utils */
+	void getTimeAndDate(TimeDate &t, bool skipRecord) const override;
+	Audio::Mixer *getMixer(void) override;
+	Common::Path getDefaultConfigFileName(void) override;
+	void logMessage(LogMessageType::Type type, const char *message) override;
+	int testGame(const char *filedata, bool autodetect);
+	void addSysArchivesToSearchSet(Common::SearchSet &s, int priority = 0) override;
+	const char *const *buildHelpDialogData() override;
+	Common::String getSaveDir(void);
+	GUI::OptionsContainerWidget *buildBackendOptionsWidget(GUI::GuiObject *boss, const Common::String &name, const Common::String &target) const override;
+	void applyBackendSettings() override;
+private:
+	bool parseGameName(const Common::String &gameName, Common::String &engineId, Common::String &gameId);
+	bool checkPathSetting(const char *setting, Common::String const &defaultPath, bool isDirectory = true);
+	void setLibretroDir(const char *path, Common::String &var);
+
+	/* Inputs */
+public:
+	void processInputs(void);
+	void processKeyEvent(bool down, unsigned keycode, uint32 character, uint16 key_modifiers);
+private:
+	void updateMouseXY(float deltaAcc, float *cumulativeXYAcc, int doing_x);
+	void getMouseXYFromAnalog(bool is_x, int16 coor);
+	void getMouseXYFromButton(bool is_x, int16 sign);
+};
+
+#endif