volume changes

as of now the master volume is 1.0x (it was 2.0x before)
NES has also been amplified.
these changes should not affect older songs.

papers/format.md

@@ -25,6 +25,8 @@ furthermore, an `or reserved` indicates this field is always present, but is res
 
 the format versions are:
 
+- 59: Furnace dev59
+- 58: Furnace dev58
 - 57: Furnace dev57
 
 - 53: Furnace 0.5.7
@@ -201,6 +203,8 @@ size | description
  S?? | channel short names
      | - same as above
  STR | song comment
+  4f | master volume, 1.0f=100% (>=59)
+     | this is 2.0f for modules before 59
 
 # instrument
 

src/engine/engine.h

@@ -37,8 +37,8 @@
     warnings+=(String("\n")+x); \
   }
 
-#define DIV_VERSION "dev58"
-#define DIV_ENGINE_VERSION 58
+#define DIV_VERSION "dev59"
+#define DIV_ENGINE_VERSION 59
 
 enum DivStatusView {
   DIV_STATUS_NOTHING=0,

src/engine/fileOps.cpp

@@ -841,7 +841,12 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
     if (tchans>DIV_MAX_CHANS) tchans=DIV_MAX_CHANS;
 
     // system volume
-    for (int i=0; i<32; i++) ds.systemVol[i]=reader.readC();
+    for (int i=0; i<32; i++) {
+      ds.systemVol[i]=reader.readC();
+      if (ds.version<59 && ds.system[i]==DIV_SYSTEM_NES) {
+        ds.systemVol[i]/=4;
+      }
+    }
 
     // system panning
     for (int i=0; i<32; i++) ds.systemPan[i]=reader.readC();
@@ -999,6 +1004,12 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       ds.notes=reader.readString();
     }
 
+    if (ds.version>=59) {
+      ds.masterVol=reader.readF();
+    } else {
+      ds.masterVol=2.0f;
+    }
+
     // read instruments
     for (int i=0; i<ds.insLen; i++) {
       DivInstrument* ins=new DivInstrument;
@@ -1444,6 +1455,8 @@ SafeWriter* DivEngine::saveFur() {
 
   w->writeString(song.notes,false);
 
+  w->writeF(song.masterVol);
+
   /// INSTRUMENT
   for (int i=0; i<song.insLen; i++) {
     DivInstrument* ins=song.ins[i];

src/engine/platform/nes.cpp

@@ -99,7 +99,10 @@ void DivPlatformNES::acquire(short* bufL, short* bufR, size_t start, size_t len)
     if (nes->apu.clocked) {
       nes->apu.clocked=false;
     }
-    bufL[i]=(pulse_output(nes)+tnd_output(nes))*30;
+    int sample=(pulse_output(nes)+tnd_output(nes)-128)<<7;
+    if (sample>32767) sample=32767;
+    if (sample<-32768) sample=-32768;
+    bufL[i]=sample;
   }
 }
 

src/engine/playback.cpp

@@ -1294,17 +1294,17 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
   }
 
   for (int i=0; i<song.systemLen; i++) {
-    float volL=((float)song.systemVol[i]/64.0f)*((float)MIN(127,127-(int)song.systemPan[i])/127.0f);
-    float volR=((float)song.systemVol[i]/64.0f)*((float)MIN(127,127+(int)song.systemPan[i])/127.0f);
+    float volL=((float)song.systemVol[i]/64.0f)*((float)MIN(127,127-(int)song.systemPan[i])/127.0f)*song.masterVol;
+    float volR=((float)song.systemVol[i]/64.0f)*((float)MIN(127,127+(int)song.systemPan[i])/127.0f)*song.masterVol;
     if (disCont[i].dispatch->isStereo()) {
       for (size_t j=0; j<size; j++) {
-        out[0][j]+=((float)disCont[i].bbOut[0][j]/16384.0)*volL;
-        out[1][j]+=((float)disCont[i].bbOut[1][j]/16384.0)*volR;
+        out[0][j]+=((float)disCont[i].bbOut[0][j]/32768.0)*volL;
+        out[1][j]+=((float)disCont[i].bbOut[1][j]/32768.0)*volR;
       }
     } else {
       for (size_t j=0; j<size; j++) {
-        out[0][j]+=((float)disCont[i].bbOut[0][j]/16384.0)*volL;
-        out[1][j]+=((float)disCont[i].bbOut[0][j]/16384.0)*volR;
+        out[0][j]+=((float)disCont[i].bbOut[0][j]/32768.0)*volL;
+        out[1][j]+=((float)disCont[i].bbOut[0][j]/32768.0)*volR;
       }
     }
   }

src/engine/song.h

@@ -241,6 +241,7 @@ struct DivSong {
   bool pal;
   bool customTempo;
   int hz, patLen, ordersLen, insLen, waveLen, sampleLen;
+  float masterVol;
   float tuning;
 
   // compatibility flags
@@ -308,6 +309,7 @@ struct DivSong {
     insLen(0),
     waveLen(0),
     sampleLen(0),
+    masterVol(1.0f),
     tuning(440.0f),
     limitSlides(false),
     linearPitch(true),

src/gui/gui.cpp

@@ -1345,6 +1345,10 @@ void FurnaceGUI::drawMixer() {
   ImGui::SetNextWindowSizeConstraints(ImVec2(400.0f*dpiScale,200.0f*dpiScale),ImVec2(scrW*dpiScale,scrH*dpiScale));
   if (ImGui::Begin("Mixer",&mixerOpen,settings.allowEditDocking?0:ImGuiWindowFlags_NoDocking)) {
     char id[32];
+    if (ImGui::SliderFloat("Master Volume",&e->song.masterVol,0,3,"%.2fx")) {
+      if (e->song.masterVol<0) e->song.masterVol=0;
+      if (e->song.masterVol>3) e->song.masterVol=3;
+    }
     for (int i=0; i<e->song.systemLen; i++) {
       snprintf(id,31,"MixS%d",i);
       bool doInvert=e->song.systemVol[i]&128;