ZVISION: Implement PanTrack.

1 files changed, 74 insertions, 1 deletions

diff --git a/engines/zvision/music_node.cpp b/engines/zvision/music_node.cpp
index 709b554823..081c9dbcca 100644
--- a/engines/zvision/music_node.cpp
+++ b/engines/zvision/music_node.cpp
@@ -26,6 +26,7 @@
 
 #include "zvision/zvision.h"
 #include "zvision/script_manager.h"
+#include "zvision/render_manager.h"
 #include "zvision/zork_raw.h"
 
 #include "common/stream.h"
@@ -40,7 +41,7 @@ MusicNode::MusicNode(ZVision *engine, uint32 key, Common::String &filename, bool
 	_loop = loop;
 	_volume = volume;
 	_crossfade = false;
-	_crossfade_delta = 0;
+	_crossfade_target = 0;
 	_crossfade_time = 0;
 	_attenuate = 0;
 	_pantrack = false;
@@ -57,6 +58,7 @@ MusicNode::MusicNode(ZVision *engine, uint32 key, Common::String &filename, bool
 		audioStream = makeRawZorkStream(filename, _engine);
 	}
 
+	_stereo = audioStream->isStereo();
 
 	if (_loop) {
 		Audio::LoopingAudioStream *loopingAudioStream = new Audio::LoopingAudioStream(audioStream, 0, DisposeAfterUse::YES);
@@ -76,10 +78,81 @@ MusicNode::~MusicNode() {
 	debug(1, "MusicNode: %d destroyed\n", _key);
 }
 
+void MusicNode::setPanTrack(int16 pos) {
+	if (!_stereo) {
+		_pantrack = true;
+		_pantrack_X = pos;
+		setVolume(_volume);
+	}
+}
+
+void MusicNode::unsetPanTrack() {
+	_pantrack = false;
+	setVolume(_volume);
+}
+
 bool MusicNode::process(uint32 deltaTimeInMillis) {
 	if (! _engine->_mixer->isSoundHandleActive(_handle))
 		return stop();
+	else {
+		uint8 _newvol = _volume;
+
+		if (_pantrack || _volume != _newvol)
+			setVolume(_newvol);
+	}
 	return false;
 }
 
+void MusicNode::setVolume(uint8 new_volume) {
+	if (_pantrack) {
+		int cur_x = _engine->getScriptManager()->getStateValue(StateKey_ViewPos);
+		cur_x -= _pantrack_X;
+		int32 _width = _engine->getRenderManager()->getBkgSize().x;
+		if (cur_x < (-_width) / 2)
+			cur_x += _width;
+		else if (cur_x >= _width / 2)
+			cur_x -= _width;
+
+		float norm = (float)cur_x / ((float)_width / 2.0);
+		float lvl = fabs(norm);
+		if (lvl > 0.5)
+			lvl = (lvl - 0.5) * 1.7;
+		else
+			lvl = 1.0;
+
+		float bal = sin(-norm * 3.1415926) * 127.0;
+
+		if (_engine->_mixer->isSoundHandleActive(_handle)) {
+			_engine->_mixer->setChannelBalance(_handle, bal);
+			_engine->_mixer->setChannelVolume(_handle, new_volume * lvl);
+		}
+	} else {
+		if (_engine->_mixer->isSoundHandleActive(_handle)) {
+			_engine->_mixer->setChannelBalance(_handle, 0);
+			_engine->_mixer->setChannelVolume(_handle, new_volume);
+		}
+	}
+
+	_volume = new_volume;
+}
+
+PanTrackNode::PanTrackNode(ZVision *engine, uint32 key, uint32 slot, int16 pos)
+	: SideFX(engine, key, SIDEFX_PANTRACK) {
+	_slot = slot;
+
+	SideFX *fx = _engine->getScriptManager()->getSideFX(slot);
+	if (fx && fx->getType() == SIDEFX_AUDIO) {
+		MusicNode *mus = (MusicNode *)fx;
+		mus->setPanTrack(pos);
+	}
+}
+
+PanTrackNode::~PanTrackNode() {
+	SideFX *fx = _engine->getScriptManager()->getSideFX(_slot);
+	if (fx && fx->getType() == SIDEFX_AUDIO) {
+		MusicNode *mus = (MusicNode *)fx;
+		mus->unsetPanTrack();
+	}
+}
+
 } // End of namespace ZVision