/[svn]/linuxsampler/trunk/src/engines/common/InstrumentScriptVM.cpp
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revision 2598 by schoenebeck, Fri Jun 6 12:38:54 2014 UTC revision 2613 by schoenebeck, Tue Jun 10 15:17:01 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    #include "MidiKeyboardManager.h"
15    
16  namespace LinuxSampler {  namespace LinuxSampler {
17    
18      // circumvents a bug in GCC 4.x which causes a sizeof() expression applied      ///////////////////////////////////////////////////////////////////////
19      // on a class member to throw a compiler error, i.e. with GCC 4.4:      // class 'InstrumentScript'
20      // "object missing in reference to 'LinuxSampler::AbstractEngineChannel::ControllerTable'")  
21      // or with GCC 4.0:      /** @brief Load real-time instrument script.
22      // "invalid use of non-static data member 'LinuxSampler::AbstractEngineChannel::ControllerTable'"       *
23      #define _MEMBER_SIZEOF(T_Class, Member) sizeof(((T_Class*)NULL)->Member)       * Loads the real-time instrument script given by @a text on the engine
24         * channel this InstrumentScript object belongs to (defined by
25         * pEngineChannel member variable). The sampler engine's resource manager is
26         * used to allocate and share equivalent scripts on multiple engine
27         * channels.
28         *
29         * @param text - source code of script
30         */
31        void InstrumentScript::load(const String& text) {
32            dmsg(1,("Loading real-time instrument script ... "));
33    
34            // hand back old script reference and VM execution contexts
35            // (if not done already)
36            unload();
37    
38            code = text;
39    
40            AbstractInstrumentManager* pManager =
41                dynamic_cast<AbstractInstrumentManager*>(pEngineChannel->pEngine->GetInstrumentManager());
42    
43            // get new script reference
44            parserContext = pManager->scripts.Borrow(text, pEngineChannel);
45            if (!parserContext->errors().empty()) {
46                std::vector<ParserIssue> errors = parserContext->errors();
47                std::cerr << "[ScriptVM] Could not load instrument script, there were "
48                        << errors.size() << " parser errors:\n";
49                for (int i = 0; i < errors.size(); ++i)
50                    errors[i].dump();
51                return; // stop here if there were any parser errors
52            }
53    
54            handlerInit = parserContext->eventHandlerByName("init");
55            handlerNote = parserContext->eventHandlerByName("note");
56            handlerRelease = parserContext->eventHandlerByName("release");
57            handlerController = parserContext->eventHandlerByName("controller");
58            bHasValidScript =
59                handlerInit || handlerNote || handlerRelease || handlerController;
60    
61            // amount of script handlers each script event has to execute
62            int handlerExecCount = 0;
63            if (handlerNote || handlerRelease || handlerController) // only one of these are executed after "init" handler
64                handlerExecCount++;
65    
66            // create script event pool (if it doesn't exist already)
67            if (!pEvents)
68                pEvents = new Pool<ScriptEvent>(CONFIG_MAX_EVENTS_PER_FRAGMENT);
69    
70            // create new VM execution contexts for new script
71            while (!pEvents->poolIsEmpty()) {
72                RTList<ScriptEvent>::Iterator it = pEvents->allocAppend();
73                it->execCtx = pEngineChannel->pEngine->pScriptVM->createExecContext(
74                    parserContext
75                );
76                it->handlers = new VMEventHandler*[handlerExecCount+1];
77            }
78            pEvents->clear();
79    
80            dmsg(1,("Done\n"));
81        }
82    
83        /** @brief Unload real-time instrument script.
84         *
85         * Unloads the currently used real-time instrument script and frees all
86         * resources allocated for that script. The sampler engine's resource manager
87         * is used to share equivalent scripts among multiple sampler channels, and
88         * to deallocate the parsed script once not used on any engine channel
89         * anymore.
90         *
91         * Calling thid method will however not clear the @c code member variable.
92         * Thus, the script can be parsed again afterwards.
93         */
94        void InstrumentScript::unload() {
95            if (parserContext)
96                dmsg(1,("Unloading current instrument script.\n"));
97    
98            // free allocated VM execution contexts
99            if (pEvents) {
100                pEvents->clear();
101                while (!pEvents->poolIsEmpty()) {
102                    RTList<ScriptEvent>::Iterator it = pEvents->allocAppend();
103                    if (it->execCtx) {
104                        // free VM execution context object
105                        delete it->execCtx;
106                        it->execCtx = NULL;
107                        // free C array of handler pointers
108                        delete [] it->handlers;
109                    }
110                }
111                pEvents->clear();
112            }
113            // hand back VM representation of script
114            if (parserContext) {
115                AbstractInstrumentManager* pManager =
116                    dynamic_cast<AbstractInstrumentManager*>(pEngineChannel->pEngine->GetInstrumentManager());
117    
118                pManager->scripts.HandBack(parserContext, pEngineChannel);
119                parserContext = NULL;
120                handlerInit = NULL;
121                handlerNote = NULL;
122                handlerRelease = NULL;
123                handlerController = NULL;
124            }
125            bHasValidScript = false;
126        }
127    
128        /**
129         * Same as unload(), but this one also empties the @c code member variable
130         * to an empty string.
131         */
132        void InstrumentScript::resetAll() {
133            unload();
134            code.clear();
135        }
136    
137        ///////////////////////////////////////////////////////////////////////
138        // class 'InstrumentScriptVM'
139    
140      InstrumentScriptVM::InstrumentScriptVM() :      InstrumentScriptVM::InstrumentScriptVM() :
141          m_event(NULL), m_fnPlayNote(this), m_fnIgnoreEvent(this),          m_event(NULL), m_fnPlayNote(this), m_fnSetController(this),
142          m_fnIgnoreController(this)          m_fnIgnoreEvent(this), m_fnIgnoreController(this)
143      {      {
144          m_CC.size = _MEMBER_SIZEOF(AbstractEngineChannel, ControllerTable);          m_CC.size = _MEMBER_SIZEOF(AbstractEngineChannel, ControllerTable);
145          m_CC_NUM = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.CC.Controller);          m_CC_NUM = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.CC.Controller);
146          m_EVENT_ID = DECLARE_VMINT(m_event, class ScriptEvent, id);          m_EVENT_ID = DECLARE_VMINT(m_event, class ScriptEvent, id);
147          m_EVENT_NOTE = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.Note.Key);          m_EVENT_NOTE = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.Note.Key);
148          m_EVENT_VELOCITY = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.Note.Velocity);          m_EVENT_VELOCITY = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.Note.Velocity);
149            m_KEY_DOWN.size = 128;
150      }      }
151    
152      VMExecStatus_t InstrumentScriptVM::exec(VMParserContext* parserCtx, ScriptEvent* event) {      VMExecStatus_t InstrumentScriptVM::exec(VMParserContext* parserCtx, ScriptEvent* event) {
# Line 37  namespace LinuxSampler { Line 156  namespace LinuxSampler {
156          // prepare built-in script variables for script execution          // prepare built-in script variables for script execution
157          m_event = event;          m_event = event;
158          m_CC.data = (int8_t*) &pEngineChannel->ControllerTable[0];          m_CC.data = (int8_t*) &pEngineChannel->ControllerTable[0];
159            m_KEY_DOWN.data = &pEngineChannel->GetMidiKeyboardManager()->KeyDown[0];
160    
161          // if script is in start condition, then do mandatory MIDI event          // if script is in start condition, then do mandatory MIDI event
162          // preprocessing tasks, which essentially means updating i.e. controller          // preprocessing tasks, which essentially means updating i.e. controller
# Line 92  namespace LinuxSampler { Line 212  namespace LinuxSampler {
212    
213          // now add own built-in variables          // now add own built-in variables
214          m["%CC"] = &m_CC;          m["%CC"] = &m_CC;
215          //m["%KEY_DOWN"] = &m_KEY_DOWN;          m["%KEY_DOWN"] = &m_KEY_DOWN;
216          //m["%POLY_AT"] = &m_POLY_AT;          //m["%POLY_AT"] = &m_POLY_AT;
217    
218          return m;          return m;
# Line 111  namespace LinuxSampler { Line 231  namespace LinuxSampler {
231      VMFunction* InstrumentScriptVM::functionByName(const String& name) {      VMFunction* InstrumentScriptVM::functionByName(const String& name) {
232          // built-in script functions of this class          // built-in script functions of this class
233          if      (name == "play_note") return &m_fnPlayNote;          if      (name == "play_note") return &m_fnPlayNote;
234            else if (name == "set_controller") return &m_fnSetController;
235          else if (name == "ignore_event") return &m_fnIgnoreEvent;          else if (name == "ignore_event") return &m_fnIgnoreEvent;
236          else if (name == "ignore_controller") return &m_fnIgnoreController;          else if (name == "ignore_controller") return &m_fnIgnoreController;
237    
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