adding initial code for Another World engine

svn-id: r13783

1 files changed, 145 insertions, 0 deletions

diff --git a/awe/engine.cpp b/awe/engine.cpp
new file mode 100644
index 0000000000..ab8b60dea4
--- /dev/null
+++ b/awe/engine.cpp
@@ -0,0 +1,145 @@
+/* AWE - Another World Engine
+ * Copyright (C) 2004 Gregory Montoir
+ * Copyright (C) 2004 The ScummVM project
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include "stdafx.h"
+
+#include "awe.h"
+#include "engine.h"
+#include "file.h"
+#include "serializer.h"
+#include "systemstub.h"
+
+namespace Awe {
+
+Engine::Engine(SystemStub *stub, const char *dataDir, const char *saveDir)
+	: _stub(stub), _log(&_res, &_vid, stub), _res(&_vid, dataDir), _vid(&_res, stub), 
+	_dataDir(dataDir), _saveDir(saveDir), _stateSlot(0) {
+}
+
+void Engine::run() {
+	_stub->init("Out Of This World");
+	setup();
+	// XXX
+	_log.restartAt(0x3E80); // demo starts at 0x3E81
+	while (!_stub->_pi.quit) {
+		_log.setupScripts();
+		_log.inp_updatePlayer();
+		processInput();
+		_log.runScripts();
+	}
+	finish();
+	_stub->destroy();
+}
+
+void Engine::setup() {
+	_vid.init();
+	_res.allocMemBlock();
+	_res.readEntries();
+	_log.init();
+}
+
+void Engine::finish() {
+	 // XXX
+	 _res.freeMemBlock();
+}
+
+void Engine::processInput() {
+	if (_stub->_pi.load) {
+		loadGameState(_stateSlot);
+		_stub->_pi.load = false;
+	}
+	if (_stub->_pi.save) {
+		saveGameState(_stateSlot, "quicksave");
+		_stub->_pi.save = false;
+	}
+	if (_stub->_pi.fastMode) {
+		_log._fastMode = !_log._fastMode;
+		_stub->_pi.fastMode = false;
+	}
+	if (_stub->_pi.stateSlot != 0) {
+		int8 slot = _stateSlot + _stub->_pi.stateSlot;
+		if (slot >= 0 && slot < MAX_SAVE_SLOTS) {
+			_stateSlot = slot;
+			debug(DBG_INFO, "Current game state slot is %d", _stateSlot);
+		}
+		_stub->_pi.stateSlot = 0;
+	}
+}
+
+void Engine::makeGameStateName(uint8 slot, char *buf) {
+	sprintf(buf, "raw.s%02d", slot);
+}
+
+void Engine::saveGameState(uint8 slot, const char *desc) {
+	char stateFile[20];
+	makeGameStateName(slot, stateFile);
+	File f(true);
+	if (!f.open(stateFile, _saveDir, "wb")) {
+		::warning("Unable to save state file '%s'", stateFile);
+	} else {
+		// header
+		f.writeUint32BE('AWSV');
+		f.writeUint16BE(Serializer::CUR_VER);
+		f.writeUint16BE(0);
+		char hdrdesc[32];
+		strncpy(hdrdesc, desc, sizeof(hdrdesc) - 1);
+		f.write(hdrdesc, sizeof(hdrdesc));
+		// contents
+		Serializer s(&f, Serializer::SM_SAVE, _res._memPtrStart);
+		_log.saveOrLoad(s);
+		_res.saveOrLoad(s);
+		_vid.saveOrLoad(s);
+		if (f.ioErr()) {
+			::warning("I/O error when saving game state");
+		} else {
+			debug(DBG_INFO, "Saved state to slot %d", _stateSlot);
+		}
+	}
+}
+
+void Engine::loadGameState(uint8 slot) {
+	char stateFile[20];
+	makeGameStateName(slot, stateFile);
+	File f(true);
+	if (!f.open(stateFile, _saveDir, "rb")) {
+		::warning("Unable to open state file '%s'", stateFile);
+	} else {
+		uint32 id = f.readUint32BE();
+		if (id != 'AWSV') {
+			::warning("Bad savegame format");
+		} else {
+			uint16 ver = f.readUint16BE();
+			f.readUint16BE();
+			char hdrdesc[32];
+			f.read(hdrdesc, sizeof(hdrdesc));
+			// contents
+			Serializer s(&f, Serializer::SM_LOAD, _res._memPtrStart, ver);
+			_log.saveOrLoad(s);
+			_res.saveOrLoad(s);
+			_vid.saveOrLoad(s);
+		}
+		if (f.ioErr()) {
+			::warning("I/O error when loading game state");
+		} else {
+			debug(DBG_INFO, "Loaded state from slot %d", _stateSlot);
+		}
+	}
+}
+
+}