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/* 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 2
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef SCI_ENGINE_GUEST_ADDITIONS_H
#define SCI_ENGINE_GUEST_ADDITIONS_H
#include "sci/engine/vm_types.h"
namespace Sci {
struct EngineState;
class GameFeatures;
class Kernel;
class Script;
class SegManager;
/**
* The GuestAdditions class hooks into the SCI virtual machine to provide
* enhanced interactions between the ScummVM GUI and the game engine. Currently,
* this enhanced functionality encompasses synchronisation of audio volumes and
* other audio-related settings, and integration of the ScummVM GUI when saving
* and loading game states.
*
* NOTE: Some parts of the code used to manage audio sync are applied as script
* patches using the normal ScriptPatcher mechanism. These patches prevent the
* game from resetting audio volumes to defaults when starting up, and prevent
* the game from restoring audio volumes stored inside of a save game.
*/
class GuestAdditions {
public:
GuestAdditions(EngineState *state, GameFeatures *features, Kernel *kernel);
#pragma mark -
/**
* Synchronises audio volume settings from ScummVM to the game. Called
* whenever the ScummVM global menu is dismissed.
*/
void syncSoundSettingsFromScummVM() const;
/**
* Synchronises all audio settings from ScummVM to the game. Called when the
* game is first started, and when save games are loaded.
*/
void syncAudioOptionsFromScummVM() const;
/**
* Clears audio settings synchronisation state.
*/
void reset();
private:
EngineState *_state;
GameFeatures *_features;
Kernel *_kernel;
SegManager *_segMan;
/**
* Convenience function for invoking selectors that reduces boilerplate code
* required by Sci::invokeSelector.
*/
void invokeSelector(const reg_t objId, const Selector selector, const int argc = 0, const StackPtr argv = nullptr) const;
/**
* Determines whether the current stack contains calls from audio controls
* that indicate a user-initiated change of audio settings.
*/
bool shouldSyncAudioToScummVM() const;
#pragma mark -
#pragma mark Hooks
public:
/**
* Guest additions hook for SciEngine::runGame.
*/
void sciEngineRunGameHook();
/**
* Guest additions hook for write_var.
*/
void writeVarHook(const int type, const int index, const reg_t value);
/**
* Guest additions hook for kDoSoundMasterVolume.
*
* @returns true if the default action should be prevented
*/
bool kDoSoundMasterVolumeHook(const int volume) const;
#ifdef ENABLE_SCI32
/**
* Guest additions hook for SciEngine::initGame.
*/
void sciEngineInitGameHook();
/**
* Guest additions hook for send_selector.
*/
void sendSelectorHook(const reg_t sendObj, Selector &selector, reg_t *argp);
/**
* Guest additions hook for Audio32::setVolume.
*
* @returns true if the default action should be prevented
*/
bool audio32SetVolumeHook(const int16 channelIndex, const int16 volume) const;
/**
* Guest additions hook for kDoSoundSetVolume.
*/
void kDoSoundSetVolumeHook(const reg_t soundObj, const int16 volume) const;
/**
* Guest additions hook for SegManager::instantiateScript.
*/
void instantiateScriptHook(Script &script, const bool ignoreDelayedRestore = false) const;
/**
* Guest additions hook for SegManager::saveLoadWithSerializer.
*/
void segManSaveLoadScriptHook(Script &script) const;
#endif
/**
* Guest additions hook for kGetEvent.
*/
bool kGetEventHook() const;
/**
* Guest additions hook for kWait.
*/
bool kWaitHook() const;
#ifdef ENABLE_SCI32
/**
* Guest additions hook for kPlayDuck(Play) and kPlayVMD(PlayUntilEvent).
*/
bool kPlayDuckPlayVMDHook() const;
#endif
#pragma mark -
#pragma mark Integrated save & restore
public:
/**
* Patches game scripts to use the ScummVM save/load dialogue instead of the
* game's native save/load dialogue when a user tries to save or restore a
* game from inside the game.
*/
void patchGameSaveRestore() const;
private:
/**
* Patches the ScummVM save/load dialogue into the game for SCI16 games that
* use Game::save and Game::restore.
*/
void patchGameSaveRestoreSCI16() const;
#ifdef ENABLE_SCI32
public:
/**
* Finds the correct save file number and description to save or load and
* returns it to the VM. For user-interactive save file lookup, this method
* displays the ScummVM save/load dialogue. For delayed restores, it returns
* the save game number sent by the ScummVM launcher without prompting the
* user.
*/
reg_t kScummVMSaveLoad(EngineState *s, int argc, reg_t *argv) const;
private:
/**
* Patches the ScummVM save/load dialogue into SCI32 games that use
* SRDialog.
*/
void patchGameSaveRestoreSCI32(Script &script) const;
/**
* Patches the ScummVM save/load dialogue into Torin/LSL7.
*/
void patchGameSaveRestoreTorin(Script &script) const;
/**
* Patches the ScummVM save/load dialogue into Phant2.
*/
void patchGameSaveRestorePhant2(Script &script) const;
/**
* Prompts for a save game and returns it to game scripts using default
* SRDialog game class semantics.
*/
reg_t promptSaveRestoreDefault(EngineState *s, int argc, reg_t *argv) const;
/**
* Prompts for a save game and returns it to game scripts using Torin/LSL7's
* custom NewGame class semantics.
*/
reg_t promptSaveRestoreTorin(EngineState *s, int argc, reg_t *argv) const;
/**
* Prompts for a save game and returns it to game scripts using Phant2's
* custom ControlPanel class semantics.
*/
reg_t promptSaveRestorePhant2(EngineState *s, int argc, reg_t *argv) const;
/**
* Prompts the user to save or load a game.
*
* @param isSave If true, the prompt is for saving.
* @param outDescription Will be filled with the save game description.
* Optional for loads, required for saves.
* @param forcedSaveNo During delayed restore, force the returned save game
* number to this value.
*/
int runSaveRestore(const bool isSave, const reg_t outDescription, const int forcedSaveNo = -1) const;
#endif
#pragma mark -
#pragma mark Restore from launcher
private:
/**
* Invokes the game's save restore mechanism to load a save game that was
* selected in the ScummVM launcher when the game was started.
*/
bool restoreFromLauncher() const;
#ifdef ENABLE_SCI32
/**
* If true, GuestAdditions is in the process of handling a delayed game
* restore from the ScummVM launcher or global menu.
*/
mutable bool _restoring;
#endif
#pragma mark -
#pragma mark Message type sync
private:
/**
* True if the message type (text/speech/text+speech) has been synchronised
* from ScummVM to the game.
*/
bool _messageTypeSynced;
/**
* Synchronises the message type (speech/text/speech+text) from ScummVM to
* a game.
*/
void syncMessageTypeFromScummVM() const;
/**
* Synchronises the message type from ScummVM using the default strategy
* (global90).
*/
void syncMessageTypeFromScummVMUsingDefaultStrategy() const;
#ifdef ENABLE_SCI32
/**
* Synchronises the message type from ScummVM using the strategy used by
* Shivers (global211).
*/
void syncMessageTypeFromScummVMUsingShiversStrategy() const;
/**
* Synchronises the message type from ScummVM using the strategy used by
* LSL6hires (gameFlags).
*/
void syncMessageTypeFromScummVMUsingLSL6HiresStrategy() const;
#endif
/**
* Synchronises the message type (speech/text/speech+text) from a game to
* ScummVM.
*/
void syncMessageTypeToScummVM(const int index, const reg_t value);
/**
* Synchronises the message type to ScummVM using the default strategy
* (global90).
*/
void syncMessageTypeToScummVMUsingDefaultStrategy(const int index, const reg_t value);
#ifdef ENABLE_SCI32
/**
* Synchronises the message type to ScummVM using the strategy used by
* Shivers (global211).
*/
void syncMessageTypeToScummVMUsingShiversStrategy(const int index, const reg_t value);
/**
* Synchronises the message type to ScummVM using the strategy used by
* LSL6hires (gameFlags).
*/
void syncMessageTypeToScummVMUsingLSL6HiresStrategy(const reg_t sendObj, Selector &selector, reg_t *argp);
#endif
#pragma mark -
#pragma mark Master volume sync
private:
/**
* Synchronises audio volume settings from ScummVM to the game, for games
* that do not store volume themselves and just call to the kernel.
*/
void syncMasterVolumeFromScummVM() const;
/**
* Synchronises audio volume settings from the game to ScummVM, for games
* that do not store volume themselves and just call to the kernel.
*/
void syncMasterVolumeToScummVM(const int16 masterVolume) const;
#ifdef ENABLE_SCI32
#pragma mark -
#pragma mark Globals volume sync
private:
/**
* Synchronises audio volume settings from ScummVM to the game, for games
* that store volumes in globals.
*/
void syncAudioVolumeGlobalsFromScummVM() const;
/**
* Synchronises audio volume settings from ScummVM to GK1 at game startup
* time.
*/
void syncGK1StartupVolumeFromScummVM(const int index, const reg_t value) const;
/**
* Synchronises audio volume settings from ScummVM to GK1 when the game is
* running.
*/
void syncGK1VolumeFromScummVM(const int16 musicVolume, const int16 dacVolume) const;
void syncGK2VolumeFromScummVM(const int16 musicVolume) const;
void syncLSL6HiresVolumeFromScummVM(const int16 musicVolume) const;
void syncPhant2VolumeFromScummVM(const int16 masterVolume) const;
void syncTorinVolumeFromScummVM(const int16 musicVolume, const int16 sfxVolume, const int16 speechVolume) const;
/**
* Synchronises audio volume settings from a game to ScummVM, for games
* that store volumes in globals.
*/
void syncAudioVolumeGlobalsToScummVM(const int index, const reg_t value) const;
/**
* Synchronises audio volume settings from GK1 to ScummVM.
*/
void syncGK1AudioVolumeToScummVM(const reg_t soundObj, const int16 volume) const;
#pragma mark -
#pragma mark Audio UI sync
private:
/**
* Synchronises the in-game control panel UI in response to a change of
* volume from the ScummVM GUI. The values of the volume parameters passed
* to this function are game-specific.
*/
void syncInGameUI(const int16 musicVolume, const int16 sfxVolume) const;
void syncGK1UI() const;
void syncGK2UI() const;
void syncLSL6HiresUI(const int16 musicVolume) const;
void syncMGDXUI(const int16 musicVolume) const;
void syncPhant1UI(const int16 oldMusicVolume, const int16 musicVolume, reg_t &musicGlobal, const int16 oldDacVolume, const int16 dacVolume, reg_t &dacGlobal) const;
void syncPhant2UI(const int16 masterVolume) const;
void syncPQ4UI(const int16 musicVolume) const;
void syncPQSWATUI() const;
void syncQFG4UI(const int16 musicVolume) const;
void syncShivers1UI(const int16 dacVolume) const;
void syncSQ6UI() const;
void syncTorinUI(const int16 musicVolume, const int16 sfxVolume, const int16 speechVolume) const;
#pragma mark -
#pragma mark Talk speed sync
private:
/**
* Synchronises text speed settings from ScummVM to a game.
*/
void syncTextSpeedFromScummVM() const;
/**
* Synchronises text speed settings from a game to ScummVM.
*/
void syncTextSpeedToScummVM(const int index, const reg_t value) const;
#endif
};
} // End of namespace Sci
#endif // SCI_ENGINE_GUEST_ADDITIONS_H
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