Added support for SCN-based non-interactive demos

svn-id: r40122

1 files changed, 152 insertions, 0 deletions

diff --git a/engines/gob/scnplayer.cpp b/engines/gob/scnplayer.cpp
new file mode 100644
index 0000000000..3581f1678e
--- /dev/null
+++ b/engines/gob/scnplayer.cpp
@@ -0,0 +1,152 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "common/endian.h"
+
+#include "gob/gob.h"
+#include "gob/scnplayer.h"
+#include "gob/util.h"
+#include "gob/draw.h"
+#include "gob/inter.h"
+#include "gob/videoplayer.h"
+
+namespace Gob {
+
+SCNPlayer::SCNPlayer(GobEngine *vm) : _vm(vm) {
+}
+
+SCNPlayer::~SCNPlayer() {
+}
+
+inline bool SCNPlayer::lineStartsWith(const Common::String &line, const char *start) {
+	return (strstr(line.c_str(), start) == line.c_str());
+}
+
+bool SCNPlayer::play(const char *fileName) {
+	debugC(1, kDebugSCN, "Playing SCN \"%s\"", fileName);
+
+	// The video player needs some fake variables
+	_vm->_inter->allocateVars(32);
+
+	// Init the screen
+	_vm->_draw->initScreen();
+	_vm->_draw->_cursorIndex = -1;
+
+	_vm->_util->longDelay(200); // Letting everything settle
+
+	Common::File scn;
+
+	if (!scn.open(fileName))
+		return false;
+
+	return play(scn);
+}
+
+bool SCNPlayer::play(Common::File &scn) {
+	// Read labels
+	LabelMap labels;
+	if (!readLabels(scn, labels))
+		return false;
+
+	// Iterate over all lines
+	while (!scn.err() && !scn.eos()) {
+		Common::String line = scn.readLine();
+
+		// Interpret
+		if (line == "CLEAR") {
+			clearScreen();
+		} else if (lineStartsWith(line, "IMD_PRELOAD ")) {
+			playVideo(line.c_str() + 12);
+		} else if (lineStartsWith(line, "GOTO ")) {
+			gotoLabel(scn, labels, line.c_str() + 5);
+		}
+
+		// Mind user input
+		_vm->_util->processInput();
+		if (_vm->shouldQuit())
+			return true;
+	}
+
+	if (scn.err())
+		return false;
+
+	return true;
+}
+
+bool SCNPlayer::readLabels(Common::File &scn, LabelMap &labels) {
+	debugC(1, kDebugSCN, "Reading SCN labels");
+
+	int32 startPos = scn.pos();
+
+	// Iterate over all lines
+	while (!scn.err() && !scn.eos()) {
+		Common::String line = scn.readLine();
+
+		if (lineStartsWith(line, "LABEL ")) {
+			// Label => Add to the hashmap
+			labels.setVal(line.c_str() + 6, scn.pos());
+			debugC(2, kDebugSCN, "Found label \"%s\" (%d)", line.c_str() + 6, scn.pos());
+		}
+	}
+
+	if (scn.err())
+		return false;
+
+	// Seek back
+	if (!scn.seek(startPos))
+		return false;
+
+	return true;
+}
+
+void SCNPlayer::gotoLabel(Common::File &scn, const LabelMap &labels, const char *label) {
+	debugC(2, kDebugSCN, "Jumping to label \"%s\"", label);
+
+	if (!labels.contains(label))
+		return;
+
+	scn.seek(labels.getVal(label));
+}
+
+void SCNPlayer::clearScreen() {
+	debugC(1, kDebugSCN, "Clearing the screen");
+	_vm->_video->clearScreen();
+}
+
+void SCNPlayer::playVideo(const char *fileName) {
+	// Trimming spaces
+	while (*fileName == ' ')
+		fileName++;
+
+	debugC(1, kDebugSCN, "Playing video \"%s\"", fileName);
+
+	// Playing the video
+	if (_vm->_vidPlayer->primaryOpen(fileName)) {
+		_vm->_vidPlayer->primaryPlay();
+		_vm->_vidPlayer->primaryClose();
+	}
+}
+
+} // End of namespace Gob