dev82 - amiga wavetables

closes #16 (yay!)

papers/doc/7-systems/amiga.md

@@ -6,8 +6,10 @@ in this very computer music trackers were born...
 
 # effects
 
-- `10xx`: toggle low-pass filter. `0` turns it off and `1` turns it on.
+- `10xx`: change wave.
+  - only works when "Mode" is set to "Wavetable" in the instrument.
 - `11xx`: toggle amplitude modulation with the next channel.
   - does not work on the last channel.
 - `12xx`: toggle period (frequency) modulation with the next channel.
   - does not work on the last channel.
+- `13xx`: toggle low-pass filter. `0` turns it off and `1` turns it on.

papers/format.md

@@ -29,6 +29,8 @@ furthermore, an `or reserved` indicates this field is always present, but is res
 
 the format versions are:
 
+- 82: Furnace dev82
+- 81: Furnace dev81
 - 80: Furnace dev80
 - 79: Furnace dev79
 - 78: Furnace dev78
@@ -342,7 +344,11 @@ size | description
   1  | filter macro is absolute
  --- | **Amiga instrument data**
   2  | initial sample
- 14  | reserved
+  1  | mode (>=82) or reserved
+     | - 0: sample
+     | - 1: wavetable
+  1  | wavetable length (-1) (>=82) or reserved
+ 12  | reserved
  --- | **standard instrument data**
   4  | volume macro length
   4  | arp macro length

src/engine/engine.h

@@ -42,8 +42,8 @@
 #define BUSY_BEGIN_SOFT softLocked=true; isBusy.lock();
 #define BUSY_END isBusy.unlock(); softLocked=false;
 
-#define DIV_VERSION "dev81"
+#define DIV_VERSION "dev82"
-#define DIV_ENGINE_VERSION 81
+#define DIV_ENGINE_VERSION 82
 
 // for imports
 #define DIV_VERSION_MOD 0xff01

src/engine/instrument.cpp

@@ -106,7 +106,9 @@ void DivInstrument::putInsData(SafeWriter* w) {
   
   // Amiga
   w->writeS(amiga.initSample);
-  for (int j=0; j<14; j++) { // reserved
+  w->writeC(amiga.useWave);
+  w->writeC(amiga.waveLen);
+  for (int j=0; j<12; j++) { // reserved
     w->writeC(0);
   }
 
@@ -571,8 +573,15 @@ DivDataErrors DivInstrument::readInsData(SafeReader& reader, short version) {
 
   // Amiga
   amiga.initSample=reader.readS();
+  if (version>=82) {
+    amiga.useWave=reader.readC();
+    amiga.waveLen=(unsigned char)reader.readC();
+  } else {
+    reader.readC();
+    reader.readC();
+  }
   // reserved
-  for (int k=0; k<14; k++) reader.readC();
+  for (int k=0; k<12; k++) reader.readC();
 
   // standard
   std.volMacro.len=reader.readI();

src/engine/instrument.h

@@ -293,12 +293,16 @@ struct DivInstrumentC64 {
 struct DivInstrumentAmiga {
   short initSample;
   bool useNoteMap;
+  bool useWave;
+  unsigned char waveLen;
   int noteFreq[120];
   short noteMap[120];
 
   DivInstrumentAmiga():
     initSample(0),
-    useNoteMap(false) {
+    useNoteMap(false),
+    useWave(false),
+    waveLen(31) {
     memset(noteMap,-1,120*sizeof(short));
     memset(noteFreq,0,120*sizeof(int));
   }

src/engine/platform/amiga.cpp

@@ -79,26 +79,35 @@ const char* DivPlatformAmiga::getEffectName(unsigned char effect) {
   return NULL;
 }
 
+#define writeAudDat(x) \
+  chan[i].audDat=x; \
+  if (i<3 && chan[i].useV) { \
+    chan[i+1].outVol=(unsigned char)chan[i].audDat^0x80; \
+    if (chan[i+1].outVol>64) chan[i+1].outVol=64; \
+  } \
+  if (i<3 && chan[i].useP) { \
+    chan[i+1].freq=(unsigned char)chan[i].audDat^0x80; \
+    if (chan[i+1].freq<AMIGA_DIVIDER) chan[i+1].freq=AMIGA_DIVIDER; \
+  }
+
 void DivPlatformAmiga::acquire(short* bufL, short* bufR, size_t start, size_t len) {
   static int outL, outR;
   for (size_t h=start; h<start+len; h++) {
     outL=0;
     outR=0;
     for (int i=0; i<4; i++) {
-      if (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
+      if (chan[i].useWave || (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen)) {
         chan[i].audSub-=AMIGA_DIVIDER;
         if (chan[i].audSub<0) {
+          if (chan[i].useWave) {
+            writeAudDat(chan[i].ws.output[chan[i].audPos++]^0x80);
+            if (chan[i].audPos>=(unsigned int)(chan[i].audLen<<1)) {
+              chan[i].audPos=0;
+            }
+          } else {
             DivSample* s=parent->getSample(chan[i].sample);
             if (s->samples>0) {
-            chan[i].audDat=s->data8[chan[i].audPos++];
+              writeAudDat(s->data8[chan[i].audPos++]);
-            if (i<3 && chan[i].useV) {
-              chan[i+1].outVol=(unsigned char)chan[i].audDat^0x80;
-              if (chan[i+1].outVol>64) chan[i+1].outVol=64;
-            }
-            if (i<3 && chan[i].useP) {
-              chan[i+1].freq=(unsigned char)chan[i].audDat^0x80;
-              if (chan[i+1].freq<AMIGA_DIVIDER) chan[i+1].freq=AMIGA_DIVIDER;
-            }
               if (chan[i].audPos>=s->samples || chan[i].audPos>=131071) {
                 if (s->loopStart>=0 && s->loopStart<(int)s->samples) {
                   chan[i].audPos=s->loopStart;
@@ -109,6 +118,7 @@ void DivPlatformAmiga::acquire(short* bufL, short* bufR, size_t start, size_t le
             } else {
               chan[i].sample=-1;
             }
+          }
           /*if (chan[i].freq<124) {
             if (++chan[i].busClock>=512) {
               unsigned int rAmount=(124-chan[i].freq)*2;
@@ -151,7 +161,7 @@ void DivPlatformAmiga::tick() {
       chan[i].outVol=((chan[i].vol%65)*MIN(64,chan[i].std.vol.val))>>6;
     }
     double off=1.0;
-    if (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
+    if (!chan[i].useWave && chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
       DivSample* s=parent->getSample(chan[i].sample);
       if (s->centerRate<1) {
         off=1.0;
@@ -174,21 +184,21 @@ void DivPlatformAmiga::tick() {
         chan[i].freqChanged=true;
       }
     }
-    if (chan[i].std.wave.had) {
+    if (chan[i].useWave && chan[i].std.wave.had) {
-      if (chan[i].wave!=chan[i].std.wave.val) {
+      if (chan[i].wave!=chan[i].std.wave.val || chan[i].ws.activeChanged()) {
         chan[i].wave=chan[i].std.wave.val;
+        chan[i].ws.changeWave1(chan[i].wave);
         if (!chan[i].keyOff) chan[i].keyOn=true;
       }
     }
+    if (chan[i].useWave && chan[i].active) {
+      chan[i].ws.tick();
+    }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       //DivInstrument* ins=parent->getIns(chan[i].ins);
       chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true);
       if (chan[i].freq>4095) chan[i].freq=4095;
-      if (chan[i].note>0x5d) chan[i].freq=0x01;
       if (chan[i].keyOn) {
-        if (chan[i].wave<0) {
-          chan[i].wave=0;
-        }
       }
       if (chan[i].keyOff) {
       }
@@ -203,8 +213,20 @@ int DivPlatformAmiga::dispatch(DivCommand c) {
   switch (c.cmd) {
     case DIV_CMD_NOTE_ON: {
       DivInstrument* ins=parent->getIns(chan[c.chan].ins);
-      chan[c.chan].sample=ins->amiga.initSample;
       double off=1.0;
+      if (ins->amiga.useWave) {
+        chan[c.chan].useWave=true;
+        chan[c.chan].audLen=(ins->amiga.waveLen+1)>>1;
+        if (chan[c.chan].insChanged) {
+          if (chan[c.chan].wave<0) {
+            chan[c.chan].wave=0;
+            chan[c.chan].ws.setWidth(chan[c.chan].audLen<<1);
+            chan[c.chan].ws.changeWave1(chan[c.chan].wave);
+          }
+        }
+      } else {
+        chan[c.chan].sample=ins->amiga.initSample;
+        chan[c.chan].useWave=false;
         if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
           DivSample* s=parent->getSample(chan[c.chan].sample);
           if (s->centerRate<1) {
@@ -213,10 +235,11 @@ int DivPlatformAmiga::dispatch(DivCommand c) {
             off=8363.0/(double)s->centerRate;
           }
         }
+      }
       if (c.value!=DIV_NOTE_NULL) {
         chan[c.chan].baseFreq=round(off*NOTE_PERIODIC_NOROUND(c.value));
       }
-      if (chan[c.chan].sample<0 || chan[c.chan].sample>=parent->song.sampleLen) {
+      if (chan[c.chan].useWave || chan[c.chan].sample<0 || chan[c.chan].sample>=parent->song.sampleLen) {
         chan[c.chan].sample=-1;
       }
       if (chan[c.chan].setPos) {
@@ -232,6 +255,10 @@ int DivPlatformAmiga::dispatch(DivCommand c) {
       chan[c.chan].active=true;
       chan[c.chan].keyOn=true;
       chan[c.chan].std.init(ins);
+      if (chan[c.chan].useWave) {
+        chan[c.chan].ws.init(ins,chan[c.chan].audLen<<1,255,chan[c.chan].insChanged);
+      }
+      chan[c.chan].insChanged=false;
       break;
     }
     case DIV_CMD_NOTE_OFF:
@@ -247,6 +274,7 @@ int DivPlatformAmiga::dispatch(DivCommand c) {
     case DIV_CMD_INSTRUMENT:
       if (chan[c.chan].ins!=c.value || c.value2==1) {
         chan[c.chan].ins=c.value;
+        chan[c.chan].insChanged=true;
       }
       break;
     case DIV_CMD_VOLUME:
@@ -268,14 +296,16 @@ int DivPlatformAmiga::dispatch(DivCommand c) {
       chan[c.chan].freqChanged=true;
       break;
     case DIV_CMD_WAVE:
+      if (!chan[c.chan].useWave) break;
       chan[c.chan].wave=c.value;
       chan[c.chan].keyOn=true;
+      chan[c.chan].ws.changeWave1(chan[c.chan].wave);
       break;
     case DIV_CMD_NOTE_PORTA: {
       DivInstrument* ins=parent->getIns(chan[c.chan].ins);
       chan[c.chan].sample=ins->amiga.initSample;
       double off=1.0;
-      if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
+      if (!chan[c.chan].useWave && chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
         DivSample* s=parent->getSample(chan[c.chan].sample);
         if (s->centerRate<1) {
           off=1.0;
@@ -307,7 +337,7 @@ int DivPlatformAmiga::dispatch(DivCommand c) {
     }
     case DIV_CMD_LEGATO: {
       double off=1.0;
-      if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
+      if (!chan[c.chan].useWave && chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
         DivSample* s=parent->getSample(chan[c.chan].sample);
         if (s->centerRate<1) {
           off=1.0;
@@ -327,6 +357,7 @@ int DivPlatformAmiga::dispatch(DivCommand c) {
       chan[c.chan].inPorta=c.value;
       break;
     case DIV_CMD_SAMPLE_POS:
+      if (chan[c.chan].useWave) break;
       chan[c.chan].audPos=c.value;
       chan[c.chan].setPos=true;
       break;
@@ -373,6 +404,8 @@ void* DivPlatformAmiga::getChanState(int ch) {
 void DivPlatformAmiga::reset() {
   for (int i=0; i<4; i++) {
     chan[i]=DivPlatformAmiga::Channel();
+    chan[i].ws.setEngine(parent);
+    chan[i].ws.init(NULL,32,255);
     filter[0][i]=0;
     filter[1][i]=0;
   }
@@ -397,7 +430,11 @@ void DivPlatformAmiga::notifyInsChange(int ins) {
 }
 
 void DivPlatformAmiga::notifyWaveChange(int wave) {
-  // TODO when wavetables are added
+  for (int i=0; i<4; i++) {
+    if (chan[i].useWave && chan[i].wave==wave) {
+      chan[i].ws.changeWave1(wave);
+    }
+  }
 }
 
 void DivPlatformAmiga::notifyInsDeletion(void* ins) {

src/engine/platform/amiga.h

@@ -23,6 +23,7 @@
 #include "../dispatch.h"
 #include <queue>
 #include "../macroInt.h"
+#include "../waveSynth.h"
 
 class DivPlatformAmiga: public DivDispatch {
   struct Channel {
@@ -39,6 +40,7 @@ class DivPlatformAmiga: public DivDispatch {
     bool active, insChanged, freqChanged, keyOn, keyOff, inPorta, useWave, setPos, useV, useP;
     signed char vol, outVol;
     DivMacroInt std;
+    DivWaveSynth ws;
     Channel():
       freq(0),
       baseFreq(0),
@@ -49,7 +51,7 @@ class DivPlatformAmiga: public DivDispatch {
       audSub(0),
       audDat(0),
       sample(-1),
-      wave(0),
+      wave(-1),
       ins(-1),
       busClock(0),
       note(0),

src/gui/insEdit.cpp

@@ -2264,6 +2264,17 @@ void FurnaceGUI::drawInsEdit() {
             }
             ImGui::EndCombo();
           }
+          P(ImGui::Checkbox("Use wavetable (Amiga only)",&ins->amiga.useWave));
+          if (ins->amiga.useWave) {
+            int len=ins->amiga.waveLen+1;
+            if (ImGui::InputInt("Width",&len,2,16)) {
+              if (len<2) len=2;
+              if (len>256) len=256;
+              ins->amiga.waveLen=(len&(~1))-1;
+              PARAMETER
+            }
+          }
+          ImGui::BeginDisabled(ins->amiga.useWave);
           P(ImGui::Checkbox("Use sample map (does not work yet!)",&ins->amiga.useNoteMap));
           if (ins->amiga.useNoteMap) {
             if (ImGui::BeginTable("NoteMap",3,ImGuiTableFlags_ScrollY|ImGuiTableFlags_Borders|ImGuiTableFlags_SizingStretchSame)) {
@@ -2317,6 +2328,7 @@ void FurnaceGUI::drawInsEdit() {
               ImGui::EndTable();
             }
           }
+          ImGui::EndDisabled();
           ImGui::EndTabItem();
         }
         if (ins->type==DIV_INS_N163) if (ImGui::BeginTabItem("Namco 163")) {
@@ -2383,7 +2395,7 @@ void FurnaceGUI::drawInsEdit() {
           ImGui::EndTabItem();
         }
         if (ins->type==DIV_INS_GB ||
-            ins->type==DIV_INS_AMIGA ||
+            (ins->type==DIV_INS_AMIGA && ins->amiga.useWave) ||
             ins->type==DIV_INS_X1_010 ||
             ins->type==DIV_INS_N163 ||
             ins->type==DIV_INS_FDS ||