/[svn]/libgig/trunk/src/gig.cpp

Diff of /libgig/trunk/src/gig.cpp

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-revision 3623 by schoenebeck,
Wed Oct  2 16:30:29 2019 UTC
+revision 3732 by schoenebeck,
Sat Feb  1 15:51:54 2020 UTC
 Line 2
   *                                                                         *
   *   libgig - C++ cross-platform Gigasampler format file access library    *
   *                                                                         *
-  *   Copyright (C) 2003-2019 by Christian Schoenebeck                      *
+  *   Copyright (C) 2003-2020 by Christian Schoenebeck                      *
   *                              <cuse@users.sourceforge.net>               *
   *                                                                         *
   *   This library is free software; you can redistribute it and/or modify  *
 Line 3412 
 namespace {
          }
          File* pFile = (File*) GetParent()->GetParent();
-         bool versiongt2 = pFile->pVersion && pFile->pVersion->major > 2;
+         const bool versiongt2 = pFile->pVersion && pFile->pVersion->major > 2;
          const int iMaxDimensions =  versiongt2 ? 8 : 5;
          const int iMaxDimensionRegions = versiongt2 ? 256 : 32;
 Line 3459 
 namespace {
              }
              store32(&pData[iWavePoolOffset + i * 4], iWaveIndex);
          }
+         // The following chunks are just added for compatibility with the
+         // GigaStudio software, which would show a warning if these were
+         // missing. However currently these chunks don't cover any useful
+         // data. So if this gig file uses any of our own gig format
+         // extensions which would cause this gig file to be unloadable
+         // with GSt software anyway, then just skip these GSt compatibility
+         // chunks here as well.
+         if (versiongt2 && !UsesAnyGigFormatExtension()) {
+             // add 3dnm list which always seems to be empty
+             RIFF::List* _3dnm = pCkRegion->GetSubList(LIST_TYPE_3DNM);
+             if (!_3dnm) _3dnm = pCkRegion->AddSubList(LIST_TYPE_3DNM);
+             // add 3ddp chunk which always seems to have 16 bytes of 0xFF
+             RIFF::Chunk* _3ddp = pCkRegion->GetSubChunk(CHUNK_ID_3DDP);
+             if (!_3ddp) _3ddp =  pCkRegion->AddSubChunk(CHUNK_ID_3DDP, 16);
+             uint8_t* pData = (uint8_t*) _3ddp->LoadChunkData();
+             for (int i = 0; i < 16; i += 4) {
+                 store32(&pData[i], 0xFFFFFFFF);
+             }
+             // move 3dnm and 3ddp to the end of the region list
+             pCkRegion->MoveSubChunk(pCkRegion->GetSubList(LIST_TYPE_3DNM), (RIFF::Chunk*)NULL);
+             pCkRegion->MoveSubChunk(pCkRegion->GetSubChunk(CHUNK_ID_3DDP), (RIFF::Chunk*)NULL);
+         } else {
+             // this is intended for the user switching from GSt >= 3 version
+             // back to an older format version, delete GSt3 chunks ...
+             RIFF::List* _3dnm = pCkRegion->GetSubList(LIST_TYPE_3DNM);
+             if (_3dnm) pCkRegion->DeleteSubChunk(_3dnm);
+             RIFF::Chunk* _3ddp = pCkRegion->GetSubChunk(CHUNK_ID_3DDP);
+             if (_3ddp) pCkRegion->DeleteSubChunk(_3ddp);
+         }
      }
      void Region::LoadDimensionRegions(RIFF::List* rgn) {
-Line 3857 
 namespace {
+Line 3890 
 namespace {
          // now tempRegion's dimensions and DimensionRegions basically reflect
          // what we wanted to get for this actual Region here, so we now just
          // delete and recreate the dimension in question with the new amount
-         // zones and then copy back from tempRegion
+         // zones and then copy back from tempRegion. we're actually deleting and
-         DeleteDimension(oldDef);
+         // recreating all dimensions here, to avoid altering the precise order
-         AddDimension(&newDef);
+         // of the dimensions (which would not be an error per se, but it would
+         // cause usability issues with instrument editors)
+         {
+             std::vector<dimension_def_t> oldDefs;
+             for (int i = 0; i < Dimensions; ++i)
+                 oldDefs.push_back(pDimensionDefinitions[i]); // copy, don't reference
+             for (int i = Dimensions - 1; i >= 0; --i)
+                 DeleteDimension(&pDimensionDefinitions[i]);
+             for (int i = 0; i < oldDefs.size(); ++i) {
+                 dimension_def_t& def = oldDefs[i];
+                 AddDimension(
+                     (def.dimension == newDef.dimension) ? &newDef : &def
+                 );
+             }
+         }
          for (int iSrc = 0; iSrc < 256; ++iSrc) {
              DimensionRegion* srcDimRgn = tempRgn->pDimensionRegions[iSrc];
              if (!srcDimRgn) continue;
-Line 3997 
 namespace {
+Line 4044 
 namespace {
          // now tempRegion's dimensions and DimensionRegions basically reflect
          // what we wanted to get for this actual Region here, so we now just
          // delete and recreate the dimension in question with the new amount
-         // zones and then copy back from tempRegion
+         // zones and then copy back from tempRegion. we're actually deleting and
-         DeleteDimension(oldDef);
+         // recreating all dimensions here, to avoid altering the precise order
-         AddDimension(&newDef);
+         // of the dimensions (which would not be an error per se, but it would
+         // cause usability issues with instrument editors)
+         {
+             std::vector<dimension_def_t> oldDefs;
+             for (int i = 0; i < Dimensions; ++i)
+                 oldDefs.push_back(pDimensionDefinitions[i]); // copy, don't reference
+             for (int i = Dimensions - 1; i >= 0; --i)
+                 DeleteDimension(&pDimensionDefinitions[i]);
+             for (int i = 0; i < oldDefs.size(); ++i) {
+                 dimension_def_t& def = oldDefs[i];
+                 AddDimension(
+                     (def.dimension == newDef.dimension) ? &newDef : &def
+                 );
+             }
+         }
          for (int iSrc = 0; iSrc < 256; ++iSrc) {
              DimensionRegion* srcDimRgn = tempRgn->pDimensionRegions[iSrc];
              if (!srcDimRgn) continue;
-Line 4323 
 namespace {
+Line 4384 
 namespace {
          Layers = orig->Layers;
      }
+     /**
+      * Returns @c true in case this Region object uses any gig format
+      * extension, that is e.g. whether any DimensionRegion object currently
+      * has any setting effective that would require our "LSDE" RIFF chunk to
+      * be stored to the gig file.
+      *
+      * Right now this is a private method. It is considerable though this method
+      * to become (in slightly modified form) a public API method in future, i.e.
+      * to allow instrument editors to visualize and/or warn the user of any gig
+      * format extension being used. See also comments on
+      * DimensionRegion::UsesAnyGigFormatExtension() for details about such a
+      * potential public API change in future.
+      */
+     bool Region::UsesAnyGigFormatExtension() const {
+         for (int i = 0; i < 256; i++) {
+             if (pDimensionRegions[i]) {
+                 if (pDimensionRegions[i]->UsesAnyGigFormatExtension())
+                     return true;
+             }
+         }
+         return false;
+     }
  // *************** MidiRule ***************
  // *
-Line 4504 
 namespace {
+Line 4588 
 namespace {
              Compression = (Compression_t) ckScri->ReadUint32();
              Encoding    = (Encoding_t) ckScri->ReadUint32();
              Language    = (Language_t) ckScri->ReadUint32();
-             Bypass      = (Language_t) ckScri->ReadUint32() & 1;
+             Bypass      = ckScri->ReadUint32() & 1;
              crc         = ckScri->ReadUint32();
              uint32_t nameSize = ckScri->ReadUint32();
              Name.resize(nameSize, ' ');
              for (int i = 0; i < nameSize; ++i)
                  Name[i] = ckScri->ReadUint8();
+             // check if an uuid was already stored along with this script
+             if (headerSize >= 6*sizeof(int32_t) + nameSize + 16) { // yes ...
+                 for (uint i = 0; i < 16; ++i) {
+                     Uuid[i] = ckScri->ReadUint8();
+                 }
+             } else { // no uuid yet, generate one now ...
+                 GenerateUuid();
+             }
              // to handle potential future extensions of the header
              ckScri->SetPos(sizeof(int32_t) + headerSize);
              // read actual script data
-Line 4524 
 namespace {
+Line 4616 
 namespace {
              Bypass   = false;
              crc      = 0;
              Name     = "Unnamed Script";
+             GenerateUuid();
          }
      }
-Line 4578 
 namespace {
+Line 4671 
 namespace {
          __calculateCRC(&data[0], data.size(), crc);
          __finalizeCRC(crc);
          // make sure chunk exists and has the required size
-         const file_offset_t chunkSize = (file_offset_t) 7*sizeof(int32_t) + Name.size() + data.size();
+         const file_offset_t chunkSize =
+             (file_offset_t) 7*sizeof(int32_t) + Name.size() + 16 + data.size();
          if (!pChunk) pChunk = pGroup->pList->AddSubChunk(CHUNK_ID_SCRI, chunkSize);
          else pChunk->Resize(chunkSize);
          // fill the chunk data to be written to disk
          uint8_t* pData = (uint8_t*) pChunk->LoadChunkData();
          int pos = 0;
-         store32(&pData[pos], uint32_t(6*sizeof(int32_t) + Name.size())); // total header size
+         store32(&pData[pos], uint32_t(6*sizeof(int32_t) + Name.size() + 16)); // total header size
          pos += sizeof(int32_t);
          store32(&pData[pos], Compression);
          pos += sizeof(int32_t);
-Line 4600 
 namespace {
+Line 4694 
 namespace {
          pos += sizeof(int32_t);
          for (int i = 0; i < Name.size(); ++i, ++pos)
              pData[pos] = Name[i];
+         for (int i = 0; i < 16; ++i, ++pos)
+             pData[pos] = Uuid[i];
          for (int i = 0; i < data.size(); ++i, ++pos)
              pData[pos] = data[i];
      }
      /**
+      * Generate a new Universally Unique Identifier (UUID) for this script.
+      */
+     void Script::GenerateUuid() {
+         DLS::dlsid_t dlsid;
+         DLS::Resource::GenerateDLSID(&dlsid);
+         Uuid[0]  = dlsid.ulData1       & 0xff;
+         Uuid[1]  = dlsid.ulData1 >>  8 & 0xff;
+         Uuid[2]  = dlsid.ulData1 >> 16 & 0xff;
+         Uuid[3]  = dlsid.ulData1 >> 24 & 0xff;
+         Uuid[4]  = dlsid.usData2       & 0xff;
+         Uuid[5]  = dlsid.usData2 >>  8 & 0xff;
+         Uuid[6]  = dlsid.usData3       & 0xff;
+         Uuid[7]  = dlsid.usData3 >>  8 & 0xff;
+         Uuid[8]  = dlsid.abData[0];
+         Uuid[9]  = dlsid.abData[1];
+         Uuid[10] = dlsid.abData[2];
+         Uuid[11] = dlsid.abData[3];
+         Uuid[12] = dlsid.abData[4];
+         Uuid[13] = dlsid.abData[5];
+         Uuid[14] = dlsid.abData[6];
+         Uuid[15] = dlsid.abData[7];
+     }
+     /**
       * Move this script from its current ScriptGroup to another ScriptGroup
       * given by @a pGroup.
       *
-Line 4874 
 namespace {
+Line 4994 
 namespace {
          // own gig format extensions
          RIFF::List* lst3LS = insList->GetSubList(LIST_TYPE_3LS);
          if (lst3LS) {
+             // script slots (that is references to instrument scripts)
              RIFF::Chunk* ckSCSL = lst3LS->GetSubChunk(CHUNK_ID_SCSL);
              if (ckSCSL) {
                  ckSCSL->SetPos(0);
-Line 4893 
 namespace {
+Line 5014 
 namespace {
                      }
                  }
              }
+             // overridden script 'patch' variables
+             RIFF::Chunk* ckSCPV = lst3LS->GetSubChunk(CHUNK_ID_SCPV);
+             if (ckSCPV) {
+                 ckSCPV->SetPos(0);
+                 int nScripts = ckSCPV->ReadUint32();
+                 for (int iScript = 0; iScript < nScripts; ++iScript) {
+                     _UUID uuid;
+                     for (int i = 0; i < 16; ++i)
+                         uuid[i] = ckSCPV->ReadUint8();
+                     uint slot = ckSCPV->ReadUint32();
+                     ckSCPV->ReadUint32(); // unused, reserved 32 bit
+                     int nVars = ckSCPV->ReadUint32();
+                     for (int iVar = 0; iVar < nVars; ++iVar) {
+                         uint8_t type = ckSCPV->ReadUint8();
+                         ckSCPV->ReadUint8();  // unused, reserved byte
+                         int blobSize = ckSCPV->ReadUint16();
+                         RIFF::file_offset_t pos = ckSCPV->GetPos();
+                         // assuming 1st bit is set in 'type', otherwise blob not
+                         // supported for decoding
+                         if (type & 1) {
+                             String name, value;
+                             int len = ckSCPV->ReadUint16();
+                             for (int i = 0; i < len; ++i)
+                                 name += (char) ckSCPV->ReadUint8();
+                             len = ckSCPV->ReadUint16();
+                             for (int i = 0; i < len; ++i)
+                                 value += (char) ckSCPV->ReadUint8();
+                             if (!name.empty()) // 'name' should never be empty, but just to be sure
+                                 scriptVars[uuid][slot][name] = value;
+                         }
+                         // also for potential future extensions: seek forward
+                         // according to blob size
+                         ckSCPV->SetPos(pos + blobSize);
+                     }
+                 }
+             }
          }
          if (pProgress)
-Line 4984 
 namespace {
+Line 5143 
 namespace {
             RIFF::List* lst3LS = pCkInstrument->GetSubList(LIST_TYPE_3LS);
             if (!lst3LS) lst3LS = pCkInstrument->AddSubList(LIST_TYPE_3LS);
+            // save script slots (that is references to instrument scripts)
             const int slotCount = (int) pScriptRefs->size();
             const int headerSize = 3 * sizeof(uint32_t);
             const int slotSize  = 2 * sizeof(uint32_t);
-Line 5008 
 namespace {
+Line 5169 
 namespace {
                 store32(&pData[pos], (*pScriptRefs)[i].bypass ? 1 : 0);
                 pos += sizeof(uint32_t);
             }
+            // save overridden script 'patch' variables ...
+            // the actual 'scriptVars' member variable might contain variables of
+            // scripts which are currently no longer assigned to any script slot
+            // of this instrument, we need to get rid of these variables here to
+            // prevent saving those persistently, however instead of touching the
+            // member variable 'scriptVars' directly, rather strip a separate
+            // copy such that the overridden values are not lost during an
+            // instrument editor session (i.e. if script might be re-assigned)
+            _VarsByScript vars = stripScriptVars();
+            if (!vars.empty()) {
+                // determine total size required for 'SCPV' RIFF chunk, and the
+                // total amount of scripts being overridden (the latter is
+                // required because a script might be used on several script
+                // slots, hence vars.size() could then not be used here instead)
+                size_t totalChunkSize = 4;
+                size_t totalScriptsOverridden = 0;
+                for (const auto& script : vars) {
+                    for (const auto& slot : script.second) {
+                        totalScriptsOverridden++;
+                        totalChunkSize += 16 + 4 + 4 + 4;
+                        for (const auto& var : slot.second) {
+                            totalChunkSize += 4 + 2 + var.first.length() +
++ var.second.length();
+                        }
+                    }
+                }
+                // ensure 'SCPV' RIFF chunk exists (with required size)
+                RIFF::Chunk* ckSCPV = lst3LS->GetSubChunk(CHUNK_ID_SCPV);
+                if (!ckSCPV) ckSCPV = lst3LS->AddSubChunk(CHUNK_ID_SCPV, totalChunkSize);
+                else ckSCPV->Resize(totalChunkSize);
+                // store the actual data to 'SCPV' RIFF chunk
+                uint8_t* pData = (uint8_t*) ckSCPV->LoadChunkData();
+                int pos = 0;
+                store32(&pData[pos], (uint32_t) totalScriptsOverridden); // scripts count
+                pos += 4;
+                for (const auto& script : vars) {
+                    for (const auto& slot : script.second) {
+                        for (int i = 0; i < 16; ++i)
+                            pData[pos+i] = script.first[i]; // uuid
+                        pos += 16;
+                        store32(&pData[pos], (uint32_t) slot.first); // slot index
+                        pos += 4;
+                        store32(&pData[pos], (uint32_t) 0); // unused, reserved 32 bit
+                        pos += 4;
+                        store32(&pData[pos], (uint32_t) slot.second.size()); // variables count
+                        pos += 4;
+                        for (const auto& var : slot.second) {
+                            pData[pos++] = 1; // type
+                            pData[pos++] = 0; // reserved byte
+                            store16(&pData[pos], 2 + var.first.size() + 2 + var.second.size()); // blob size
+                            pos += 2;
+                            store16(&pData[pos], var.first.size()); // variable name length
+                            pos += 2;
+                            for (int i = 0; i < var.first.size(); ++i)
+                                pData[pos++] = var.first[i];
+                            store16(&pData[pos], var.second.size()); // variable value length
+                            pos += 2;
+                            for (int i = 0; i < var.second.size(); ++i)
+                                pData[pos++] = var.second[i];
+                        }
+                    }
+                }
+            } else {
+                // no script variable overridden by this instrument, so get rid
+                // of 'SCPV' RIFF chunk (if any)
+                RIFF::Chunk* ckSCPV = lst3LS->GetSubChunk(CHUNK_ID_SCPV);
+                if (ckSCPV) lst3LS->DeleteSubChunk(ckSCPV);
+            }
         } else {
             // no script slots, so get rid of any LS custom RIFF chunks (if any)
             RIFF::List* lst3LS = pCkInstrument->GetSubList(LIST_TYPE_3LS);
-Line 5432 
 namespace {
+Line 5665 
 namespace {
              scriptPoolFileOffsets.at(index).bypass = bBypass;
      }
+     /// type cast (by copy) uint8_t[16] -> std::array<uint8_t,16>
+     inline std::array<uint8_t,16> _UUIDFromCArray(const uint8_t* pData) {
+         std::array<uint8_t,16> uuid;
+         memcpy(&uuid[0], pData, 16);
+         return uuid;
+     }
+     /**
+      * Returns true if this @c Instrument has any script slot which references
+      * the @c Script identified by passed @p uuid.
+      */
+     bool Instrument::ReferencesScriptWithUuid(const _UUID& uuid) {
+         const uint nSlots = ScriptSlotCount();
+         for (uint iSlot = 0; iSlot < nSlots; ++iSlot)
+             if (_UUIDFromCArray(&GetScriptOfSlot(iSlot)->Uuid[0]) == uuid)
+                 return true;
+         return false;
+     }
+     /** @brief Checks whether a certain script 'patch' variable value is set.
+      *
+      * Returns @c true if the initial value for the requested script variable is
+      * currently overridden by this instrument.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be retrieved
+      * @param variable - name of the 'patch' variable in that script
+      */
+     bool Instrument::IsScriptPatchVariableSet(int slot, String variable) {
+         if (variable.empty()) return false;
+         Script* script = GetScriptOfSlot(slot);
+         if (!script) return false;
+         const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+         if (!scriptVars.count(uuid)) return false;
+         const _VarsBySlot& slots = scriptVars.find(uuid)->second;
+         if (slots.empty()) return false;
+         if (slots.count(slot))
+             return slots.find(slot)->second.count(variable);
+         else
+             return slots.begin()->second.count(variable);
+     }
+     /** @brief Get all overridden script 'patch' variables.
+      *
+      * Returns map of key-value pairs reflecting all patch variables currently
+      * being overridden by this instrument for the given script @p slot, where
+      * key is the variable name and value is the hereby currently overridden
+      * value for that variable.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be retrieved
+      */
+     std::map<String,String> Instrument::GetScriptPatchVariables(int slot) {
+         Script* script = GetScriptOfSlot(slot);
+         if (!script) return std::map<String,String>();
+         const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+         if (!scriptVars.count(uuid)) return std::map<String,String>();
+         const _VarsBySlot& slots = scriptVars.find(uuid)->second;
+         if (slots.empty()) return std::map<String,String>();
+         const _PatchVars& vars =
+             (slots.count(slot)) ?
+                 slots.find(slot)->second : slots.begin()->second;
+         return vars;
+     }
+     /** @brief Get overridden initial value for 'patch' variable.
+      *
+      * Returns current initial value for the requested script variable being
+      * overridden by this instrument.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be retrieved
+      * @param variable - name of the 'patch' variable in that script
+      */
+     String Instrument::GetScriptPatchVariable(int slot, String variable) {
+         std::map<String,String> vars = GetScriptPatchVariables(slot);
+         return (vars.count(variable)) ? vars.find(variable)->second : "";
+     }
+     /** @brief Override initial value for 'patch' variable.
+      *
+      * Overrides initial value for the requested script variable for this
+      * instrument with the passed value.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be set
+      * @param variable - name of the 'patch' variable in that script
+      * @param value - overridden initial value for that script variable
+      * @throws gig::Exception if given script @p slot index is invalid or given
+      *         @p variable name is empty
+      */
+     void Instrument::SetScriptPatchVariable(int slot, String variable, String value) {
+         if (variable.empty())
+             throw Exception("Variable name must not be empty");
+         Script* script = GetScriptOfSlot(slot);
+         if (!script)
+             throw Exception("No script slot with index " + ToString(slot));
+         const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+         scriptVars[uuid][slot][variable] = value;
+     }
+     /** @brief Drop overridden initial value(s) for 'patch' variable(s).
+      *
+      * Reverts initial value(s) for requested script variable(s) back to their
+      * default initial value(s) defined in the script itself.
+      *
+      * Both arguments of this method are optional. The most obvious use case of
+      * this method would be passing a valid script @p slot index and a
+      * (non-emtpy string as) @p variable name to this method, which would cause
+      * that single variable to be unset for that specific script slot (on this
+      * @c Instrument level).
+      *
+      * Not passing a value (or @c -1 for @p slot and/or empty string for
+      * @p variable) means 'wildcard'. So accordingly absence of argument(s) will
+      * cause all variables and/or for all script slots being unset. Hence this
+      * method serves 2^2 = 4 possible use cases in total and accordingly covers
+      * 4 different behaviours in one method.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be unset
+      * @param variable - name of the 'patch' variable in that script
+      */
+     void Instrument::UnsetScriptPatchVariable(int slot, String variable) {
+         Script* script = GetScriptOfSlot(slot);
+         // option 1: unset a particular variable of one particular script slot
+         if (slot != -1 && !variable.empty()) {
+             if (!script) return;
+             const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+             if (!scriptVars.count(uuid)) return;
+             if (!scriptVars[uuid].count(slot)) return;
+             if (scriptVars[uuid][slot].count(variable))
+                 scriptVars[uuid][slot].erase(
+                     scriptVars[uuid][slot].find(variable)
+                 );
+             if (scriptVars[uuid][slot].empty())
+                 scriptVars[uuid].erase( scriptVars[uuid].find(slot) );
+             if (scriptVars[uuid].empty())
+                 scriptVars.erase( scriptVars.find(uuid) );
+             return;
+         }
+         // option 2: unset all variables of all script slots
+         if (slot == -1 && variable.empty()) {
+             scriptVars.clear();
+             return;
+         }
+         // option 3: unset all variables of one particular script slot only
+         if (slot != -1) {
+             if (!script) return;
+             const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+             if (scriptVars.count(uuid))
+                 scriptVars.erase( scriptVars.find(uuid) );
+             return;
+         }
+         // option 4: unset a particular variable of all script slots
+         _VarsByScript::iterator itScript = scriptVars.begin();
+         _VarsByScript::iterator endScript = scriptVars.end();
+         while (itScript != endScript) {
+             _VarsBySlot& slots = itScript->second;
+             _VarsBySlot::iterator itSlot = slots.begin();
+             _VarsBySlot::iterator endSlot = slots.end();
+             while (itSlot != endSlot) {
+                 _PatchVars& vars = itSlot->second;
+                 if (vars.count(variable))
+                     vars.erase( vars.find(variable) );
+                 if (vars.empty())
+                     slots.erase(itSlot++); // postfix increment to avoid iterator invalidation
+                 else
+                     ++itSlot;
+             }
+             if (slots.empty())
+                 scriptVars.erase(itScript++); // postfix increment to avoid iterator invalidation
+             else
+                 ++itScript;
+         }
+     }
+     /**
+      * Returns stripped version of member variable @c scriptVars, where scripts
+      * no longer referenced by this @c Instrument are filtered out, and so are
+      * variables of meanwhile obsolete slots (i.e. a script still being
+      * referenced, but previously overridden on a script slot which either no
+      * longer exists or is hosting another script now).
+      */
+     Instrument::_VarsByScript Instrument::stripScriptVars() {
+         _VarsByScript vars;
+         _VarsByScript::const_iterator itScript = scriptVars.begin();
+         _VarsByScript::const_iterator endScript = scriptVars.end();
+         for (; itScript != endScript; ++itScript) {
+             const _UUID& uuid = itScript->first;
+             if (!ReferencesScriptWithUuid(uuid))
+                 continue;
+             const _VarsBySlot& slots = itScript->second;
+             _VarsBySlot::const_iterator itSlot = slots.begin();
+             _VarsBySlot::const_iterator endSlot = slots.end();
+             for (; itSlot != endSlot; ++itSlot) {
+                 Script* script = GetScriptOfSlot(itSlot->first);
+                 if (!script) continue;
+                 if (_UUIDFromCArray(&script->Uuid[0]) != uuid) continue;
+                 if (itSlot->second.empty()) continue;
+                 vars[uuid][itSlot->first] = itSlot->second;
+             }
+         }
+         return vars;
+     }
      /**
       * Make a (semi) deep copy of the Instrument object given by @a orig
       * and assign it to this object.
-Line 5467 
 namespace {
+Line 5959 
 namespace {
          DimensionKeyRange = orig->DimensionKeyRange;
          scriptPoolFileOffsets = orig->scriptPoolFileOffsets;
          pScriptRefs = orig->pScriptRefs;
+         scriptVars = orig->scriptVars;
          // free old midi rules
          for (int i = 0 ; pMidiRules[i] ; i++) {
-Line 5493 
 namespace {
+Line 5986 
 namespace {
          UpdateRegionKeyTable();
      }
+     /**
+      * Returns @c true in case this Instrument object uses any gig format
+      * extension, that is e.g. whether any DimensionRegion object currently
+      * has any setting effective that would require our "LSDE" RIFF chunk to
+      * be stored to the gig file.
+      *
+      * Right now this is a private method. It is considerable though this method
+      * to become (in slightly modified form) a public API method in future, i.e.
+      * to allow instrument editors to visualize and/or warn the user of any gig
+      * format extension being used. See also comments on
+      * DimensionRegion::UsesAnyGigFormatExtension() for details about such a
+      * potential public API change in future.
+      */
+     bool Instrument::UsesAnyGigFormatExtension() const {
+         if (!pRegions) return false;
+         if (!scriptVars.empty()) return true;
+         RegionList::const_iterator iter = pRegions->begin();
+         RegionList::const_iterator end  = pRegions->end();
+         for (; iter != end; ++iter) {
+             gig::Region* rgn = static_cast<gig::Region*>(*iter);
+             if (rgn->UsesAnyGigFormatExtension())
+                 return true;
+         }
+         return false;
+     }
  // *************** Group ***************
  // *
-Line 6625 
 namespace {
+Line 7144 
 namespace {
              if (pVersion && pVersion->major > 2) {
                  RIFF::Chunk* _3gnm = _3gnl->GetFirstSubChunk();
                  for (int i = 0 ; i < 128 ; i++) {
-                     if (i >= pGroups->size()) ::SaveString(CHUNK_ID_3GNM, _3gnm, _3gnl, "", "", true, 64);
+                     // create 128 empty placeholder strings which will either
+                     // be filled by Group::UpdateChunks below or left empty.
+                     ::SaveString(CHUNK_ID_3GNM, _3gnm, _3gnl, "", "", true, 64);
                      if (_3gnm) _3gnm = _3gnl->GetNextSubChunk();
                  }
              }
-Line 6821 
 namespace {
+Line 7342 
 namespace {
          return bAutoLoad;
      }
+     /**
+      * Returns @c true in case this gig File object uses any gig format
+      * extension, that is e.g. whether any DimensionRegion object currently
+      * has any setting effective that would require our "LSDE" RIFF chunk to
+      * be stored to the gig file.
+      *
+      * Right now this is a private method. It is considerable though this method
+      * to become (in slightly modified form) a public API method in future, i.e.
+      * to allow instrument editors to visualize and/or warn the user of any gig
+      * format extension being used. See also comments on
+      * DimensionRegion::UsesAnyGigFormatExtension() for details about such a
+      * potential public API change in future.
+      */
+     bool File::UsesAnyGigFormatExtension() const {
+         if (!pInstruments) return false;
+         InstrumentList::iterator iter = pInstruments->begin();
+         InstrumentList::iterator end  = pInstruments->end();
+         for (; iter != end; ++iter) {
+             Instrument* pInstrument = static_cast<gig::Instrument*>(*iter);
+             if (pInstrument->UsesAnyGigFormatExtension())
+                 return true;
+         }
+         return false;
+     }
  // *************** Exception ***************

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