COMPOSER: Implement V1 random events.

4 files changed, 39 insertions, 1 deletions

diff --git a/engines/composer/composer.cpp b/engines/composer/composer.cpp
index 17c14ddba9..556dad7e94 100644
--- a/engines/composer/composer.cpp
+++ b/engines/composer/composer.cpp
@@ -443,6 +443,20 @@ void ComposerEngine::loadLibrary(uint id) {
 		newLib._keyboardHandlers.push_back(handler);
 	}
 
+	Common::Array<uint16> randResources = library._archive->getResourceIDList(ID_RAND);
+	for (uint i = 0; i < randResources.size(); i++) {
+		Common::SeekableReadStream *stream = library._archive->getResource(ID_RAND, randResources[i]);
+		Common::Array<RandomEvent> &events = _randomEvents[randResources[i]];
+		uint16 count = stream->readUint16LE();
+		for (uint j = 0; j < count; j++) {
+			RandomEvent random;
+			random.scriptId = stream->readUint16LE();
+			random.weight = stream->readUint16LE();
+			events.push_back(random);
+		}
+		delete stream;
+	}
+
 	// add background sprite, if it exists
 	if (hasResource(ID_BMAP, 1000))
 		setBackground(1000);
@@ -470,6 +484,8 @@ void ComposerEngine::unloadLibrary(uint id) {
 		_anims.clear();
 		stopPipes();
 
+		_randomEvents.clear();
+
 		for (Common::List<Sprite>::iterator j = _sprites.begin(); j != _sprites.end(); j++) {
 			j->_surface.free();
 		}
diff --git a/engines/composer/composer.h b/engines/composer/composer.h
index 02dbca53b2..cebe977517 100644
--- a/engines/composer/composer.h
+++ b/engines/composer/composer.h
@@ -101,6 +101,11 @@ struct KeyboardHandler {
 	uint16 scriptId;
 };
 
+struct RandomEvent {
+	uint16 weight;
+	uint16 scriptId;
+};
+
 struct Library {
 	uint _id;
 	Archive *_archive;
@@ -182,6 +187,8 @@ private:
 	Common::List<Animation *> _anims;
 	Common::List<Pipe *> _pipes;
 
+	Common::HashMap<uint16, Common::Array<RandomEvent> > _randomEvents;
+
 	void onMouseDown(const Common::Point &pos);
 	void onMouseMove(const Common::Point &pos);
 	void onKeyDown(uint16 keyCode);
diff --git a/engines/composer/resource.h b/engines/composer/resource.h
index cc1985edd2..e0052cd868 100644
--- a/engines/composer/resource.h
+++ b/engines/composer/resource.h
@@ -43,6 +43,7 @@ struct Animation;
 #define ID_CTBL MKTAG('C','T','B','L') // Color Table
 #define ID_EVNT MKTAG('E','V','N','T') // Event
 #define ID_PIPE MKTAG('P','I','P','E') // Pipe
+#define ID_RAND MKTAG('R','A','N','D') // Random Object
 #define ID_SCRP MKTAG('S','C','R','P') // Script
 #define ID_VARI MKTAG('V','A','R','I') // Variables
 #define ID_WAVE MKTAG('W','A','V','E') // Wave
diff --git a/engines/composer/scripting.cpp b/engines/composer/scripting.cpp
index a4c78c3a39..3a201c841a 100644
--- a/engines/composer/scripting.cpp
+++ b/engines/composer/scripting.cpp
@@ -922,7 +922,21 @@ bool ComposerEngine::tickOldScript(OldScript *script) {
 			uint16 randomId;
 			randomId = script->_stream->readUint16LE();
 			debug(3, "kOldOpRunRandom(%d)", randomId);
-			warning("V1 random not yet implemented"); // FIXME
+			if (!_randomEvents.contains(randomId)) {
+				warning("kOldOpRunRandom found no entries for id %d", randomId);
+			} else {
+				uint32 randValue = _rnd->getRandomNumberRng(0, 32767);
+				const Common::Array<RandomEvent> &events = _randomEvents[randomId];
+				uint i = 0;
+				for (i = 0; i < events.size(); i++) {
+					if ((i + 1 == events.size()) || (randValue <= events[i].weight)) {
+						runScript(events[i].scriptId);
+						break;
+					} else {
+						randValue -= events[i].weight;
+					}
+				}
+			}
 			break;
 		default:
 			error("unknown oldScript op %d", op);