/[svn]/linuxsampler/trunk/src/engines/common/InstrumentScriptVMFunctions.cpp
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revision 2596 by schoenebeck, Thu Jun 5 19:39:12 2014 UTC revision 2931 by schoenebeck, Sat Jul 9 14:38:33 2016 UTC
# Line 1  Line 1 
1  /*  /*
2   * Copyright (c) 2014 Christian Schoenebeck   * Copyright (c) 2014-2016 Christian Schoenebeck
3   *   *
4   * http://www.linuxsampler.org   * http://www.linuxsampler.org
5   *   *
# Line 12  Line 12 
12  #include "../AbstractEngineChannel.h"  #include "../AbstractEngineChannel.h"
13    
14  namespace LinuxSampler {  namespace LinuxSampler {
15        
16        // play_note() function
17    
18      InstrumentScriptVMFunction_play_note::InstrumentScriptVMFunction_play_note(InstrumentScriptVM* parent)      InstrumentScriptVMFunction_play_note::InstrumentScriptVMFunction_play_note(InstrumentScriptVM* parent)
19          : m_vm(parent)          : m_vm(parent)
# Line 22  namespace LinuxSampler { Line 24  namespace LinuxSampler {
24          int note = args->arg(0)->asInt()->evalInt();          int note = args->arg(0)->asInt()->evalInt();
25          int velocity = (args->argsCount() >= 2) ? args->arg(1)->asInt()->evalInt() : 127;          int velocity = (args->argsCount() >= 2) ? args->arg(1)->asInt()->evalInt() : 127;
26          int sampleoffset = (args->argsCount() >= 3) ? args->arg(2)->asInt()->evalInt() : 0;          int sampleoffset = (args->argsCount() >= 3) ? args->arg(2)->asInt()->evalInt() : 0;
27          int duration = (args->argsCount() >= 4) ? args->arg(3)->asInt()->evalInt() : 0; //TODO: once -1 is implemented, it might be a better default value instead of 0          int duration = (args->argsCount() >= 4) ? args->arg(3)->asInt()->evalInt() : 0; //TODO: -1 might be a better default value instead of 0
28    
29          if (note < 0 || note > 127) {          if (note < 0 || note > 127) {
30              errMsg("play_note(): argument 1 is an invalid note number");              errMsg("play_note(): argument 1 is an invalid note number");
31              return errorResult();              return errorResult(0);
32          }          }
33    
34          if (velocity < 0 || velocity > 127) {          if (velocity < 0 || velocity > 127) {
35              errMsg("play_note(): argument 2 is an invalid velocity value");              errMsg("play_note(): argument 2 is an invalid velocity value");
36              return errorResult();              return errorResult(0);
37          }          }
38    
39          if (sampleoffset < 0) {          if (sampleoffset < 0) {
40              errMsg("play_note(): argument 3 may not be a negative sample offset");              errMsg("play_note(): argument 3 may not be a negative sample offset");
41              return errorResult();              return errorResult(0);
42          } else if (sampleoffset != 0) {          } else if (sampleoffset != 0) {
43              wrnMsg("play_note(): argument 3 does not support a sample offset other than 0 yet");              wrnMsg("play_note(): argument 3 does not support a sample offset other than 0 yet");
44          }          }
45    
46          if (duration < -1) {          if (duration < -1) {
47              errMsg("play_note(): argument 4 must be a duration value of at least -1 or higher");              errMsg("play_note(): argument 4 must be a duration value of at least -1 or higher");
48              return errorResult();              return errorResult(0);
         } else if (duration == -1) {  
             wrnMsg("play_note(): argument 4 does not support special value -1 as duration yet");  
         } else if (duration != 0) {  
             wrnMsg("play_note(): argument 4 does not support any other value as 0 as duration yet");  
49          }          }
50    
51          AbstractEngineChannel* pEngineChannel =          AbstractEngineChannel* pEngineChannel =
52              static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);              static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
53    
54          Event e = m_vm->m_event->cause;          Event e = m_vm->m_event->cause; // copy to get fragment time for "now"
55            e.Init(); // clear IDs
56          e.Type = Event::type_note_on;          e.Type = Event::type_note_on;
57          e.Param.Note.Key = note;          e.Param.Note.Key = note;
58          e.Param.Note.Velocity = velocity;          e.Param.Note.Velocity = velocity;
59            // make this new note dependent to the life time of the original note
60            if (duration == -1) {
61                if (m_vm->currentVMEventHandler()->eventHandlerType() != VM_EVENT_HANDLER_NOTE) {
62                    errMsg("play_note(): -1 for argument 4 may only be used for note event handlers");
63                    return errorResult(0);
64                }
65                e.Param.Note.ParentNoteID = m_vm->m_event->cause.Param.Note.ID;
66            }
67    
68            const note_id_t id = pEngineChannel->ScheduleNoteMicroSec(&e, 0);
69    
70            // if a duration is supplied (and note-on event was scheduled
71            // successfully above), then schedule a subsequent note-off event
72            if (id && duration > 0) {
73                e.Type = Event::type_note_off;
74                e.Param.Note.Velocity = 127;
75                pEngineChannel->ScheduleEventMicroSec(&e, duration);
76            }
77    
78            // even if id is null, don't return an errorResult() here, because that
79            // would abort the script, and under heavy load it may be considerable
80            // that ScheduleNoteMicroSec() fails above, so simply ignore that
81            return successResult( ScriptID::fromNoteID(id) );
82        }
83    
84        // set_controller() function
85    
86        InstrumentScriptVMFunction_set_controller::InstrumentScriptVMFunction_set_controller(InstrumentScriptVM* parent)
87            : m_vm(parent)
88        {
89        }
90    
91        VMFnResult* InstrumentScriptVMFunction_set_controller::exec(VMFnArgs* args) {
92            int controller = args->arg(0)->asInt()->evalInt();
93            int value      = args->arg(1)->asInt()->evalInt();
94    
95            AbstractEngineChannel* pEngineChannel =
96                static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
97    
98            Event e = m_vm->m_event->cause; // copy to get fragment time for "now"
99            e.Init(); // clear IDs
100            if (controller == CTRL_TABLE_IDX_AFTERTOUCH) {
101                e.Type = Event::type_channel_pressure;
102                e.Param.ChannelPressure.Value = value & 127;
103            } else if (controller == CTRL_TABLE_IDX_PITCHBEND) {
104                e.Type = Event::type_pitchbend;
105                e.Param.Pitch.Pitch = value;
106            } else if (controller >= 0 && controller <= 127) {
107                e.Type = Event::type_control_change;
108                e.Param.CC.Controller = controller;
109                e.Param.CC.Value = value;
110            } else {
111                errMsg("set_controller(): argument 1 is an invalid controller");
112                return errorResult();
113            }
114    
115            const event_id_t id = pEngineChannel->ScheduleEventMicroSec(&e, 0);
116    
117            // even if id is null, don't return an errorResult() here, because that
118            // would abort the script, and under heavy load it may be considerable
119            // that ScheduleEventMicroSec() fails above, so simply ignore that
120            return successResult( ScriptID::fromEventID(id) );
121        }
122    
123        // ignore_event() function
124    
125        InstrumentScriptVMFunction_ignore_event::InstrumentScriptVMFunction_ignore_event(InstrumentScriptVM* parent)
126            : m_vm(parent)
127        {
128        }
129    
130        bool InstrumentScriptVMFunction_ignore_event::acceptsArgType(int iArg, ExprType_t type) const {
131            return type == INT_EXPR || type == INT_ARR_EXPR;
132        }
133    
134        VMFnResult* InstrumentScriptVMFunction_ignore_event::exec(VMFnArgs* args) {
135            AbstractEngineChannel* pEngineChannel =
136                    static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
137    
138            if (args->arg(0)->exprType() == INT_EXPR) {
139                const ScriptID id = args->arg(0)->asInt()->evalInt();
140                if (!id) {
141                    wrnMsg("ignore_event(): event ID argument may not be zero");
142                    // not errorResult(), because that would abort the script, not intentional in this case
143                    return successResult();
144                }
145                pEngineChannel->IgnoreEventByScriptID(id);
146            } else if (args->arg(0)->exprType() == INT_ARR_EXPR) {
147                VMIntArrayExpr* ids = args->arg(0)->asIntArray();
148                for (int i = 0; i < ids->arraySize(); ++i) {
149                    const ScriptID id = ids->evalIntElement(i);    
150                    pEngineChannel->IgnoreEventByScriptID(id);
151                }
152            }
153    
154            return successResult();
155        }
156    
157        // ignore_controller() function
158    
159        InstrumentScriptVMFunction_ignore_controller::InstrumentScriptVMFunction_ignore_controller(InstrumentScriptVM* parent)
160            : m_vm(parent)
161        {
162        }
163    
164        VMFnResult* InstrumentScriptVMFunction_ignore_controller::exec(VMFnArgs* args) {
165            const ScriptID id = (args->argsCount() >= 1) ? args->arg(0)->asInt()->evalInt() : m_vm->m_event->id;
166            if (!id && args->argsCount() >= 1) {
167                wrnMsg("ignore_controller(): event ID argument may not be zero");
168                return successResult();
169            }
170    
171            AbstractEngineChannel* pEngineChannel =
172                static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
173    
174            pEngineChannel->IgnoreEventByScriptID(id);
175    
176            return successResult();
177        }
178    
179        // note_off() function
180    
181        InstrumentScriptVMFunction_note_off::InstrumentScriptVMFunction_note_off(InstrumentScriptVM* parent)
182            : m_vm(parent)
183        {
184        }
185    
186        bool InstrumentScriptVMFunction_note_off::acceptsArgType(int iArg, ExprType_t type) const {
187            return type == INT_EXPR || type == INT_ARR_EXPR;
188        }
189    
190        VMFnResult* InstrumentScriptVMFunction_note_off::exec(VMFnArgs* args) {
191            AbstractEngineChannel* pEngineChannel =
192                static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
193    
194            int velocity = (args->argsCount() >= 2) ? args->arg(1)->asInt()->evalInt() : 127;
195            if (velocity < 0 || velocity > 127) {
196                errMsg("note_off(): argument 2 is an invalid velocity value");
197                return errorResult();
198            }
199    
200            if (args->arg(0)->exprType() == INT_EXPR) {
201                const ScriptID id = args->arg(0)->asInt()->evalInt();  
202                if (!id) {
203                    wrnMsg("note_off(): note ID for argument 1 may not be zero");
204                    return successResult();
205                }
206                if (!id.isNoteID()) {
207                    wrnMsg("note_off(): argument 1 is not a note ID");
208                    return successResult();
209                }
210    
211                NoteBase* pNote = pEngineChannel->pEngine->NoteByID( id.noteID() );
212                if (!pNote) return successResult();
213    
214                Event e = pNote->cause;
215                e.Init(); // clear IDs
216                e.CopyTimeFrom(m_vm->m_event->cause); // set fragment time for "now"
217                e.Type = Event::type_note_off;
218                e.Param.Note.Velocity = velocity;
219    
220                pEngineChannel->ScheduleEventMicroSec(&e, 0);
221            } else if (args->arg(0)->exprType() == INT_ARR_EXPR) {
222                VMIntArrayExpr* ids = args->arg(0)->asIntArray();
223                for (int i = 0; i < ids->arraySize(); ++i) {
224                    const ScriptID id = ids->evalIntElement(i);
225                    if (!id || !id.isNoteID()) continue;
226    
227                    NoteBase* pNote = pEngineChannel->pEngine->NoteByID( id.noteID() );
228                    if (!pNote) continue;
229    
230                    Event e = pNote->cause;
231                    e.Init(); // clear IDs
232                    e.CopyTimeFrom(m_vm->m_event->cause); // set fragment time for "now"
233                    e.Type = Event::type_note_off;
234                    e.Param.Note.Velocity = velocity;
235    
236                    pEngineChannel->ScheduleEventMicroSec(&e, 0);
237                }
238            }
239    
240            return successResult();
241        }
242    
243        // set_event_mark() function
244    
245        InstrumentScriptVMFunction_set_event_mark::InstrumentScriptVMFunction_set_event_mark(InstrumentScriptVM* parent)
246            : m_vm(parent)
247        {
248        }
249    
250        VMFnResult* InstrumentScriptVMFunction_set_event_mark::exec(VMFnArgs* args) {
251            const ScriptID id = args->arg(0)->asInt()->evalInt();
252            const int groupID = args->arg(1)->asInt()->evalInt();
253    
254            if (groupID < 0 || groupID >= INSTR_SCRIPT_EVENT_GROUPS) {
255                errMsg("set_event_mark(): argument 2 is an invalid group id");
256                return errorResult();
257            }
258    
259            AbstractEngineChannel* pEngineChannel =
260                static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
261    
262            // check if the event/note still exists
263            switch (id.type()) {
264                case ScriptID::EVENT: {
265                    RTList<Event>::Iterator itEvent = pEngineChannel->pEngine->EventByID( id.eventID() );
266                    if (!itEvent) return successResult();
267                    break;
268                }
269                case ScriptID::NOTE: {
270                    NoteBase* pNote = pEngineChannel->pEngine->NoteByID( id.noteID() );
271                    if (!pNote) return successResult();
272                    break;
273                }
274            }
275    
276            pEngineChannel->pScript->eventGroups[groupID].insert(id);
277    
278          pEngineChannel->ScheduleEvent(&e, duration);          return successResult();
279        }
280    
281        // delete_event_mark() function
282    
283        InstrumentScriptVMFunction_delete_event_mark::InstrumentScriptVMFunction_delete_event_mark(InstrumentScriptVM* parent)
284            : m_vm(parent)
285        {
286        }
287    
288        VMFnResult* InstrumentScriptVMFunction_delete_event_mark::exec(VMFnArgs* args) {
289            const ScriptID id = args->arg(0)->asInt()->evalInt();
290            const int groupID = args->arg(1)->asInt()->evalInt();
291    
292            if (groupID < 0 || groupID >= INSTR_SCRIPT_EVENT_GROUPS) {
293                errMsg("delete_event_mark(): argument 2 is an invalid group id");
294                return errorResult();
295            }
296    
297            AbstractEngineChannel* pEngineChannel =
298                static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
299    
300            pEngineChannel->pScript->eventGroups[groupID].erase(id);
301    
302            return successResult();
303        }
304    
305        // by_marks() function
306    
307        InstrumentScriptVMFunction_by_marks::InstrumentScriptVMFunction_by_marks(InstrumentScriptVM* parent)
308            : m_vm(parent)
309        {
310        }
311    
312        int InstrumentScriptVMFunction_by_marks::Result::arraySize() const {
313            return eventGroup->size();
314        }
315    
316        int InstrumentScriptVMFunction_by_marks::Result::evalIntElement(uint i) {
317            return (*eventGroup)[i];
318        }
319    
320        VMFnResult* InstrumentScriptVMFunction_by_marks::errorResult() {
321            m_result.eventGroup = NULL;
322            m_result.flags = StmtFlags_t(STMT_ABORT_SIGNALLED | STMT_ERROR_OCCURRED);
323            return &m_result;
324        }
325    
326        VMFnResult* InstrumentScriptVMFunction_by_marks::successResult(EventGroup* eventGroup) {
327            m_result.eventGroup = eventGroup;
328            m_result.flags = STMT_SUCCESS;
329            return &m_result;
330        }
331    
332        VMFnResult* InstrumentScriptVMFunction_by_marks::exec(VMFnArgs* args) {
333            int groupID = args->arg(0)->asInt()->evalInt();
334    
335            if (groupID < 0 || groupID >= INSTR_SCRIPT_EVENT_GROUPS) {
336                errMsg("by_marks(): argument is an invalid group id");
337                return errorResult();
338            }
339    
340            AbstractEngineChannel* pEngineChannel =
341                static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
342    
343            return successResult( &pEngineChannel->pScript->eventGroups[groupID] );
344        }
345    
346        // change_vol() function
347    
348        InstrumentScriptVMFunction_change_vol::InstrumentScriptVMFunction_change_vol(InstrumentScriptVM* parent)
349            : m_vm(parent)
350        {
351        }
352    
353        bool InstrumentScriptVMFunction_change_vol::acceptsArgType(int iArg, ExprType_t type) const {
354            if (iArg == 0)
355                return type == INT_EXPR || type == INT_ARR_EXPR;
356            else
357                return INT_EXPR;
358        }
359    
360        VMFnResult* InstrumentScriptVMFunction_change_vol::exec(VMFnArgs* args) {
361            int volume = args->arg(1)->asInt()->evalInt(); // volume change in milli dB
362            bool relative = (args->argsCount() >= 3) ? (args->arg(2)->asInt()->evalInt() & 1) : false;
363    
364            AbstractEngineChannel* pEngineChannel =
365                static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
366    
367            if (args->arg(0)->exprType() == INT_EXPR) {
368                const ScriptID id = args->arg(0)->asInt()->evalInt();
369                if (!id) {
370                    wrnMsg("change_vol(): note ID for argument 1 may not be zero");
371                    return successResult();
372                }
373                if (!id.isNoteID()) {
374                    wrnMsg("change_vol(): argument 1 is not a note ID");
375                    return successResult();
376                }
377    
378                NoteBase* pNote = pEngineChannel->pEngine->NoteByID( id.noteID() );
379                if (!pNote) return successResult();
380    
381                const float fVolumeLin = RTMath::DecibelToLinRatio(float(volume) / 1000.f);
382                // commented out, performed by EngineBase::ProcessNoteSynthParam() for time accuracy behavior
383                /*if (relative)
384                    pNote->Override.Volume *= fVolumeLin;
385                else
386                    pNote->Override.Volume = fVolumeLin;*/
387    
388                Event e = m_vm->m_event->cause; // copy to get fragment time for "now"
389                e.Init(); // clear IDs
390                e.Type = Event::type_note_synth_param;
391                e.Param.NoteSynthParam.NoteID   = id.noteID();
392                e.Param.NoteSynthParam.Type     = Event::synth_param_volume;
393                e.Param.NoteSynthParam.Delta    = fVolumeLin;
394                e.Param.NoteSynthParam.Relative = relative;
395    
396                pEngineChannel->ScheduleEventMicroSec(&e, 0);
397            } else if (args->arg(0)->exprType() == INT_ARR_EXPR) {
398                VMIntArrayExpr* ids = args->arg(0)->asIntArray();
399                for (int i = 0; i < ids->arraySize(); ++i) {
400                    const ScriptID id = ids->evalIntElement(i);
401                    if (!id || !id.isNoteID()) continue;
402    
403                    NoteBase* pNote = pEngineChannel->pEngine->NoteByID( id.noteID() );
404                    if (!pNote) continue;
405    
406                    const float fVolumeLin = RTMath::DecibelToLinRatio(float(volume) / 1000.f);
407                    // commented out, performed by EngineBase::ProcessNoteSynthParam() for time accuracy behavior
408                    /*if (relative)
409                        pNote->Override.Volume *= fVolumeLin;
410                    else
411                        pNote->Override.Volume = fVolumeLin;*/
412    
413                    Event e = m_vm->m_event->cause; // copy to get fragment time for "now"
414                    e.Init(); // clear IDs
415                    e.Type = Event::type_note_synth_param;
416                    e.Param.NoteSynthParam.NoteID   = id.noteID();
417                    e.Param.NoteSynthParam.Type     = Event::synth_param_volume;
418                    e.Param.NoteSynthParam.Delta    = fVolumeLin;
419                    e.Param.NoteSynthParam.Relative = relative;
420    
421                    pEngineChannel->ScheduleEventMicroSec(&e, 0);
422                }
423            }
424    
425            return successResult();
426        }
427    
428        // change_tune() function
429    
430        InstrumentScriptVMFunction_change_tune::InstrumentScriptVMFunction_change_tune(InstrumentScriptVM* parent)
431            : m_vm(parent)
432        {
433        }
434    
435        bool InstrumentScriptVMFunction_change_tune::acceptsArgType(int iArg, ExprType_t type) const {
436            if (iArg == 0)
437                return type == INT_EXPR || type == INT_ARR_EXPR;
438            else
439                return INT_EXPR;
440        }
441    
442        VMFnResult* InstrumentScriptVMFunction_change_tune::exec(VMFnArgs* args) {
443            int tune = args->arg(1)->asInt()->evalInt(); // tuning change in milli cents
444            bool relative = (args->argsCount() >= 3) ? (args->arg(2)->asInt()->evalInt() & 1) : false;
445    
446            AbstractEngineChannel* pEngineChannel =
447                static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
448    
449            if (args->arg(0)->exprType() == INT_EXPR) {
450                const ScriptID id = args->arg(0)->asInt()->evalInt();
451                if (!id) {
452                    wrnMsg("change_tune(): note ID for argument 1 may not be zero");
453                    return successResult();
454                }
455                if (!id.isNoteID()) {
456                    wrnMsg("change_tune(): argument 1 is not a note ID");
457                    return successResult();
458                }
459    
460                NoteBase* pNote = pEngineChannel->pEngine->NoteByID( id.noteID() );
461                if (!pNote) return successResult();
462    
463                const float fFreqRatio = RTMath::CentsToFreqRatioUnlimited(float(tune) / 1000.f);
464                // commented out, performed by EngineBase::ProcessNoteSynthParam() for time accuracy behavior
465                /*if (relative)
466                    pNote->Override.Pitch *= fFreqRatio;
467                else
468                    pNote->Override.Pitch = fFreqRatio;*/
469    
470                Event e = m_vm->m_event->cause; // copy to get fragment time for "now"
471                e.Init(); // clear IDs
472                e.Type = Event::type_note_synth_param;
473                e.Param.NoteSynthParam.NoteID   = id.noteID();
474                e.Param.NoteSynthParam.Type     = Event::synth_param_pitch;
475                e.Param.NoteSynthParam.Delta    = fFreqRatio;
476                e.Param.NoteSynthParam.Relative = relative;
477    
478                pEngineChannel->ScheduleEventMicroSec(&e, 0);
479            } else if (args->arg(0)->exprType() == INT_ARR_EXPR) {
480                VMIntArrayExpr* ids = args->arg(0)->asIntArray();
481                for (int i = 0; i < ids->arraySize(); ++i) {
482                    const ScriptID id = ids->evalIntElement(i);
483                    if (!id || !id.isNoteID()) continue;
484    
485                    NoteBase* pNote = pEngineChannel->pEngine->NoteByID( id.noteID() );
486                    if (!pNote) continue;
487    
488                    const float fFreqRatio = RTMath::CentsToFreqRatioUnlimited(float(tune) / 1000.f);
489                    // commented out, performed by EngineBase::ProcessNoteSynthParam() for time accuracy behavior
490                    /*if (relative)
491                        pNote->Override.Pitch *= fFreqRatio;
492                    else
493                        pNote->Override.Pitch = fFreqRatio;*/
494    
495                    Event e = m_vm->m_event->cause; // copy to get fragment time for "now"
496                    e.Init(); // clear IDs
497                    e.Type = Event::type_note_synth_param;
498                    e.Param.NoteSynthParam.NoteID   = id.noteID();
499                    e.Param.NoteSynthParam.Type     = Event::synth_param_pitch;
500                    e.Param.NoteSynthParam.Delta    = fFreqRatio;
501                    e.Param.NoteSynthParam.Relative = relative;
502    
503                    pEngineChannel->ScheduleEventMicroSec(&e, 0);
504                }
505            }
506    
507            return successResult();
508        }
509    
510        // change_pan() function
511    
512        InstrumentScriptVMFunction_change_pan::InstrumentScriptVMFunction_change_pan(InstrumentScriptVM* parent)
513            : m_vm(parent)
514        {
515        }
516    
517        bool InstrumentScriptVMFunction_change_pan::acceptsArgType(int iArg, ExprType_t type) const {
518            if (iArg == 0)
519                return type == INT_EXPR || type == INT_ARR_EXPR;
520            else
521                return INT_EXPR;
522        }
523    
524        VMFnResult* InstrumentScriptVMFunction_change_pan::exec(VMFnArgs* args) {
525            int pan = args->arg(1)->asInt()->evalInt();
526            bool relative = (args->argsCount() >= 3) ? (args->arg(2)->asInt()->evalInt() & 1) : false;
527    
528            if (pan > 1000) {
529                wrnMsg("change_pan(): argument 2 may not be larger than 1000");
530                pan = 1000;
531            } else if (pan < -1000) {
532                wrnMsg("change_pan(): argument 2 may not be smaller than -1000");
533                pan = -1000;
534            }
535    
536            AbstractEngineChannel* pEngineChannel =
537                static_cast<AbstractEngineChannel*>(m_vm->m_event->cause.pEngineChannel);
538    
539            if (args->arg(0)->exprType() == INT_EXPR) {
540                const ScriptID id = args->arg(0)->asInt()->evalInt();
541                if (!id) {
542                    wrnMsg("change_pan(): note ID for argument 1 may not be zero");
543                    return successResult();
544                }
545                if (!id.isNoteID()) {
546                    wrnMsg("change_pan(): argument 1 is not a note ID");
547                    return successResult();
548                }
549    
550                NoteBase* pNote = pEngineChannel->pEngine->NoteByID( id.noteID() );
551                if (!pNote) return successResult();
552    
553                const float fPan = float(pan) / 1000.f;
554                // commented out, performed by EngineBase::ProcessNoteSynthParam() for time accuracy behavior
555                /*if (relative) {
556                    pNote->Override.Pan = RTMath::RelativeSummedAvg(pNote->Override.Pan, fPan, ++pNote->Override.PanSources);
557                } else {
558                    pNote->Override.Pan = fPan;
559                    pNote->Override.PanSources = 1; // only relevant on subsequent change_pan() calls on same note with 'relative' being set
560                }*/
561    
562                Event e = m_vm->m_event->cause; // copy to get fragment time for "now"
563                e.Init(); // clear IDs
564                e.Type = Event::type_note_synth_param;
565                e.Param.NoteSynthParam.NoteID   = id.noteID();
566                e.Param.NoteSynthParam.Type     = Event::synth_param_pan;
567                e.Param.NoteSynthParam.Delta    = fPan;
568                e.Param.NoteSynthParam.Relative = relative;
569    
570                pEngineChannel->ScheduleEventMicroSec(&e, 0);
571            } else if (args->arg(0)->exprType() == INT_ARR_EXPR) {
572                VMIntArrayExpr* ids = args->arg(0)->asIntArray();
573                for (int i = 0; i < ids->arraySize(); ++i) {
574                    const ScriptID id = ids->evalIntElement(i);
575                    if (!id || !id.isNoteID()) continue;
576    
577                    NoteBase* pNote = pEngineChannel->pEngine->NoteByID( id.noteID() );
578                    if (!pNote) continue;
579    
580                    const float fPan = float(pan) / 1000.f;
581                    // commented out, performed by EngineBase::ProcessNoteSynthParam() for time accuracy behavior
582                    /*if (relative) {
583                        pNote->Override.Pan = RTMath::RelativeSummedAvg(pNote->Override.Pan, fPan, ++pNote->Override.PanSources);
584                    } else {
585                        pNote->Override.Pan = fPan;
586                        pNote->Override.PanSources = 1; // only relevant on subsequent change_pan() calls on same note with 'relative' being set
587                    }*/
588    
589                    Event e = m_vm->m_event->cause; // copy to get fragment time for "now"
590                    e.Init(); // clear IDs
591                    e.Type = Event::type_note_synth_param;
592                    e.Param.NoteSynthParam.NoteID   = id.noteID();
593                    e.Param.NoteSynthParam.Type     = Event::synth_param_pan;
594                    e.Param.NoteSynthParam.Delta    = fPan;
595                    e.Param.NoteSynthParam.Relative = relative;
596    
597                    pEngineChannel->ScheduleEventMicroSec(&e, 0);
598                }
599            }
600    
601          return successResult();          return successResult();
602      }      }
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