Initial commit

engines/glk/zcode/zcode.cpp

@@ -0,0 +1,151 @@
+/* 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 "glk/zcode/zcode.h"
+#include "glk/zcode/frotz_types.h"
+#include "glk/zcode/screen.h"
+#include "glk/zcode/quetzal.h"
+#include "engines/util.h"
+#include "common/config-manager.h"
+#include "common/translation.h"
+
+namespace Glk {
+namespace ZCode {
+
+ZCode *g_vm;
+
+ZCode::ZCode(OSystem *syst, const GlkGameDescription &gameDesc) :
+		Processor(syst, gameDesc) {
+	g_vm = this;
+}
+
+ZCode::~ZCode() {
+	reset_memory();
+}
+
+void ZCode::initGraphicsMode() {
+	_gameFile.seek(0);
+	byte version = _gameFile.readByte();
+
+	if (version == 6) {
+		// The V6 games have graphics that expect 320x200 mode
+		Graphics::PixelFormat pixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0);
+		initGraphics(320, 200, &pixelFormat);
+	} else {
+		GlkEngine::initGraphicsMode();
+	}
+}
+
+Screen *ZCode::createScreen() {
+	return new FrotzScreen();
+}
+
+void ZCode::runGame() {
+	story_fp = &_gameFile;
+	initialize();
+
+	// If save was selected from the launcher, handle loading it
+	int saveSlot = ConfMan.hasKey("save_slot") ? ConfMan.getInt("save_slot") : -1;
+	if (saveSlot != -1) {
+		int loadResult = loadGameState(saveSlot).getCode() == Common::kNoError ? 2 : -1;
+
+		if (h_version <= V3)
+			branch(loadResult);
+		else
+			store(loadResult);
+	}
+
+	// Game loop
+	interpret();
+
+	if (!shouldQuit()) {
+		flush_buffer();
+		glk_exit();
+	}
+}
+
+void ZCode::initialize() {
+	// Call process initialization
+	Processor::initialize();
+
+	// Restart the game
+	z_restart();
+}
+
+Common::Error ZCode::loadGameState(int slot) {
+	FileReference ref(slot, "", fileusage_SavedGame | fileusage_TextMode);
+
+	strid_t file = _streams->openFileStream(&ref, filemode_Read);
+	if (file == nullptr)
+		return Common::kReadingFailed;
+
+	Quetzal q(story_fp);
+	bool success = q.restore(*file, this) == 2;
+
+	if (success) {
+		zbyte old_screen_rows;
+		zbyte old_screen_cols;
+
+		// In V3, reset the upper window.
+		if (h_version == V3)
+			split_window(0);
+
+		LOW_BYTE(H_SCREEN_ROWS, old_screen_rows);
+		LOW_BYTE(H_SCREEN_COLS, old_screen_cols);
+
+		// Reload cached header fields
+		restart_header();
+
+		/* Since QUETZAL files may be saved on many different machines,
+		 * the screen sizes may vary a lot. Erasing the status window
+		 * seems to cover up most of the resulting badness.
+		 */
+		if (h_version > V3 && h_version != V6 && (h_screen_rows != old_screen_rows
+			|| h_screen_cols != old_screen_cols))
+			erase_window(1);
+	} else {
+		error("Error reading save file");
+	}
+
+	return Common::kNoError;
+}
+
+Common::Error ZCode::saveGameState(int slot, const Common::String &desc, bool isAutosave) {
+	Common::String msg;
+	FileReference ref(slot, desc, fileusage_BinaryMode | fileusage_SavedGame);
+
+	strid_t file = _streams->openFileStream(&ref, filemode_Write);
+	if (file == nullptr)
+		return Common::kWritingFailed;
+
+	Quetzal q(story_fp);
+	bool success = q.save(*file, this, desc);
+	file->close();
+
+	if (!success)
+		print_string_uni(_("Error writing save file\n").u32_str());
+
+	return Common::kNoError;
+
+}
+
+} // End of namespace ZCode
+} // End of namespace Glk