/[svn]/linuxsampler/trunk/src/engines/common/InstrumentScriptVM.cpp
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revision 2594 by schoenebeck, Thu Jun 5 00:16:25 2014 UTC revision 2611 by schoenebeck, Mon Jun 9 19:20:37 2014 UTC
# Line 9  Line 9 
9    
10  #include "InstrumentScriptVM.h"  #include "InstrumentScriptVM.h"
11  #include "../AbstractEngineChannel.h"  #include "../AbstractEngineChannel.h"
12    #include "../../common/global_private.h"
13    #include "AbstractInstrumentManager.h"
14    
15  namespace LinuxSampler {  namespace LinuxSampler {
16    
17      // circumvents a bug in GCC 4.4 which prevents the sizeof() expr to be used      ///////////////////////////////////////////////////////////////////////
18      // directly within the scrope of a class (would throw a compiler error with:      // class 'InstrumentScript'
19      // "object missing in reference to 'LinuxSampler::AbstractEngineChannel::ControllerTable'")  
20      static const int _AbstractEngineChannel_ControllerTable_size = sizeof(AbstractEngineChannel::ControllerTable);      /** @brief Load real-time instrument script.
21         *
22      InstrumentScriptVM::InstrumentScriptVM() : m_event(NULL) {       * Loads the real-time instrument script given by @a text on the engine
23          m_CC.size = _AbstractEngineChannel_ControllerTable_size;       * channel this InstrumentScript object belongs to (defined by
24          m_CC_NUM = DECLARE_VMINT(m_cause, class Event, Param.CC.Controller);       * pEngineChannel member variable). The sampler engine's resource manager is
25          m_EVENT_NOTE = DECLARE_VMINT(m_cause, class Event, Param.Note.Key);       * used to allocate and share equivalent scripts on multiple engine
26          m_EVENT_VELOCITY = DECLARE_VMINT(m_cause, class Event, Param.Note.Velocity);       * channels.
27         *
28         * @param text - source code of script
29         */
30        void InstrumentScript::load(const String& text) {
31            dmsg(1,("Loading real-time instrument script ... "));
32    
33            // hand back old script reference and VM execution contexts
34            // (if not done already)
35            reset();
36    
37            AbstractInstrumentManager* pManager =
38                dynamic_cast<AbstractInstrumentManager*>(pEngineChannel->pEngine->GetInstrumentManager());
39    
40            // get new script reference
41            parserContext = pManager->scripts.Borrow(text, pEngineChannel);
42            if (!parserContext->errors().empty()) {
43                std::vector<ParserIssue> errors = parserContext->errors();
44                std::cerr << "[ScriptVM] Could not load instrument script, there were "
45                        << errors.size() << " parser errors:\n";
46                for (int i = 0; i < errors.size(); ++i)
47                    errors[i].dump();
48                return; // stop here if there were any parser errors
49            }
50    
51            handlerInit = parserContext->eventHandlerByName("init");
52            handlerNote = parserContext->eventHandlerByName("note");
53            handlerRelease = parserContext->eventHandlerByName("release");
54            handlerController = parserContext->eventHandlerByName("controller");
55            bHasValidScript =
56                handlerInit || handlerNote || handlerRelease || handlerController;
57    
58            // amount of script handlers each script event has to execute
59            int handlerExecCount = 0;
60            if (handlerNote || handlerRelease || handlerController) // only one of these are executed after "init" handler
61                handlerExecCount++;
62    
63            // create script event pool (if it doesn't exist already)
64            if (!pEvents)
65                pEvents = new Pool<ScriptEvent>(CONFIG_MAX_EVENTS_PER_FRAGMENT);
66    
67            // create new VM execution contexts for new script
68            while (!pEvents->poolIsEmpty()) {
69                RTList<ScriptEvent>::Iterator it = pEvents->allocAppend();
70                it->execCtx = pEngineChannel->pEngine->pScriptVM->createExecContext(
71                    parserContext
72                );
73                it->handlers = new VMEventHandler*[handlerExecCount+1];
74            }
75            pEvents->clear();
76    
77            dmsg(1,("Done\n"));
78        }
79    
80        /** @brief Unload real-time instrument script.
81         *
82         * Unloads the currently used real-time instrument script and frees all
83         * resources allocated for that script. The sampler engine's resource manager
84         * is used to share equivalent scripts among multiple sampler channels, and
85         * to deallocate the parsed script once not used on any engine channel
86         * anymore.
87         */
88        void InstrumentScript::reset() {
89            if (parserContext)
90                dmsg(1,("Unloading current instrument script."));
91    
92            // free allocated VM execution contexts
93            if (pEvents) {
94                pEvents->clear();
95                while (!pEvents->poolIsEmpty()) {
96                    RTList<ScriptEvent>::Iterator it = pEvents->allocAppend();
97                    if (it->execCtx) {
98                        // free VM execution context object
99                        delete it->execCtx;
100                        it->execCtx = NULL;
101                        // free C array of handler pointers
102                        delete [] it->handlers;
103                    }
104                }
105                pEvents->clear();
106            }
107            // hand back VM representation of script
108            if (parserContext) {
109                AbstractInstrumentManager* pManager =
110                    dynamic_cast<AbstractInstrumentManager*>(pEngineChannel->pEngine->GetInstrumentManager());
111    
112                pManager->scripts.HandBack(parserContext, pEngineChannel);
113                parserContext = NULL;
114                handlerInit = NULL;
115                handlerNote = NULL;
116                handlerRelease = NULL;
117                handlerController = NULL;
118            }
119            bHasValidScript = false;
120        }
121    
122        ///////////////////////////////////////////////////////////////////////
123        // class 'InstrumentScriptVM'
124    
125        InstrumentScriptVM::InstrumentScriptVM() :
126            m_event(NULL), m_fnPlayNote(this), m_fnSetController(this),
127            m_fnIgnoreEvent(this), m_fnIgnoreController(this)
128        {
129            m_CC.size = _MEMBER_SIZEOF(AbstractEngineChannel, ControllerTable);
130            m_CC_NUM = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.CC.Controller);
131            m_EVENT_ID = DECLARE_VMINT(m_event, class ScriptEvent, id);
132            m_EVENT_NOTE = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.Note.Key);
133            m_EVENT_VELOCITY = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.Note.Velocity);
134      }      }
135    
136      VMExecStatus_t InstrumentScriptVM::exec(VMParserContext* parserCtx, ScriptEvent* event) {      VMExecStatus_t InstrumentScriptVM::exec(VMParserContext* parserCtx, ScriptEvent* event) {
# Line 29  namespace LinuxSampler { Line 138  namespace LinuxSampler {
138              static_cast<AbstractEngineChannel*>(event->cause.pEngineChannel);              static_cast<AbstractEngineChannel*>(event->cause.pEngineChannel);
139    
140          // prepare built-in script variables for script execution          // prepare built-in script variables for script execution
141          m_cause = &event->cause;          m_event = event;
142          m_CC.data = (int8_t*) &pEngineChannel->ControllerTable[0];          m_CC.data = (int8_t*) &pEngineChannel->ControllerTable[0];
143    
144          // if script is in start condition, then do mandatory MIDI event          // if script is in start condition, then do mandatory MIDI event
# Line 37  namespace LinuxSampler { Line 146  namespace LinuxSampler {
146          // table with new CC value in case of a controller event, because the          // table with new CC value in case of a controller event, because the
147          // script might access the new CC value          // script might access the new CC value
148          if (!event->executionSlices) {          if (!event->executionSlices) {
149              switch (m_cause->Type) {              switch (event->cause.Type) {
150                  case Event::type_control_change:                  case Event::type_control_change:
151                      pEngineChannel->ControllerTable[m_cause->Param.CC.Controller] =                      pEngineChannel->ControllerTable[event->cause.Param.CC.Controller] =
152                          m_cause->Param.CC.Value;                          event->cause.Param.CC.Value;
153                      break;                      break;
154                  case Event::type_channel_pressure:                  case Event::type_channel_pressure:
155                      pEngineChannel->ControllerTable[CTRL_TABLE_IDX_AFTERTOUCH] =                      pEngineChannel->ControllerTable[CTRL_TABLE_IDX_AFTERTOUCH] =
156                          m_cause->Param.ChannelPressure.Value;                          event->cause.Param.ChannelPressure.Value;
157                      break;                      break;
158                  case Event::type_pitchbend:                  case Event::type_pitchbend:
159                      pEngineChannel->ControllerTable[CTRL_TABLE_IDX_PITCHBEND] =                      pEngineChannel->ControllerTable[CTRL_TABLE_IDX_PITCHBEND] =
160                          m_cause->Param.Pitch.Pitch;                          event->cause.Param.Pitch.Pitch;
161                      break;                      break;
162              }              }
163          }          }
164    
165          // run the script handler(s)          // run the script handler(s)
166          VMExecStatus_t res = VM_EXEC_NOT_RUNNING;          VMExecStatus_t res = VM_EXEC_NOT_RUNNING;
167          while (event->handlers[event->currentHandler]) {          for ( ; event->handlers[event->currentHandler]; event->currentHandler++) {
168              res = ScriptVM::exec(              res = ScriptVM::exec(
169                  parserCtx, event->execCtx, event->handlers[event->currentHandler++]                  parserCtx, event->execCtx, event->handlers[event->currentHandler]
170              );              );
171              event->executionSlices++;              event->executionSlices++;
172              if (res & VM_EXEC_SUSPENDED || res & VM_EXEC_ERROR) return res;              if (res & VM_EXEC_SUSPENDED || res & VM_EXEC_ERROR) return res;
# Line 72  namespace LinuxSampler { Line 181  namespace LinuxSampler {
181    
182          // now add own built-in variables          // now add own built-in variables
183          m["$CC_NUM"] = &m_CC_NUM;          m["$CC_NUM"] = &m_CC_NUM;
184            m["$EVENT_ID"] = &m_EVENT_ID;
185          m["$EVENT_NOTE"] = &m_EVENT_NOTE;          m["$EVENT_NOTE"] = &m_EVENT_NOTE;
186          m["$EVENT_VELOCITY"] = &m_EVENT_VELOCITY;          m["$EVENT_VELOCITY"] = &m_EVENT_VELOCITY;
187  //         m["$POLY_AT_NUM"] = &m_POLY_AT_NUM;  //         m["$POLY_AT_NUM"] = &m_POLY_AT_NUM;
# Line 101  namespace LinuxSampler { Line 211  namespace LinuxSampler {
211          return m;          return m;
212      }      }
213    
214        VMFunction* InstrumentScriptVM::functionByName(const String& name) {
215            // built-in script functions of this class
216            if      (name == "play_note") return &m_fnPlayNote;
217            else if (name == "set_controller") return &m_fnSetController;
218            else if (name == "ignore_event") return &m_fnIgnoreEvent;
219            else if (name == "ignore_controller") return &m_fnIgnoreController;
220    
221            // built-in script functions of derived VM class
222            return ScriptVM::functionByName(name);
223        }
224    
225  } // namespace LinuxSampler  } // namespace LinuxSampler
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