Prepare for NGP system

Also add PCM DAC as system format 0xc0

papers/format.md

@@ -236,6 +236,7 @@ size | description
      |   - 0xbd: YM2612 extra features extended - 11 channels
      |   - 0xbe: YM2612 extra features - 7 channels
      |   - 0xbf: T6W28 - 4 channels
+     |   - 0xc0: PCM DAC - 1 channel
      |   - 0xde: YM2610B extended - 19 channels
      |   - 0xe0: QSound - 19 channels
      |   - 0xfd: Dummy System - 8 channels

src/engine/song.h

@@ -114,6 +114,8 @@ enum DivSystem {
   DIV_SYSTEM_YM2612_FRAC,
   DIV_SYSTEM_YM2612_FRAC_EXT,
   DIV_SYSTEM_RESERVED_8,
+  DIV_SYSTEM_T6W28,
+  DIV_SYSTEM_PCM_DAC,
   DIV_SYSTEM_DUMMY
 };
 

src/engine/sysDef.cpp

@@ -2082,6 +2082,35 @@ void DivEngine::registerSystems() {
     fmPostEffectHandler
   );
 
+  sysDefs[DIV_SYSTEM_T6W28]=new DivSysDef(
+    "T6W28", NULL, 0xbf, 0, 4, false, true, 0, false,
+    "an SN76489 derivative used in Neo Geo Pocket, has independent stereo volume and noise channel frequency.",
+    {"Square 1", "Square 2", "Square 3", "Noise"},
+    {"S1", "S2", "S3", "NO"},
+    {DIV_CH_PULSE, DIV_CH_PULSE, DIV_CH_PULSE, DIV_CH_NOISE},
+    {DIV_INS_STD, DIV_INS_STD, DIV_INS_STD, DIV_INS_STD},
+    {},
+    [this](int ch, unsigned char effect, unsigned char effectVal) -> bool {
+      switch (effect) {
+        case 0x20: // SN noise mode
+          dispatchCmd(DivCommand(DIV_CMD_STD_NOISE_MODE,ch,effectVal));
+          break;
+        default:
+          return false;
+      }
+      return true;
+    }
+  );
+
+  sysDefs[DIV_SYSTEM_PCM_DAC]=new DivSysDef(
+    "Generic PCM DAC", NULL, 0xc0, 0, 1, false, true, 0, false,
+    "as generic sample playback as it gets.",
+    {"Sample"},
+    {"PCM"},
+    {DIV_CH_PCM},
+    {DIV_INS_AMIGA}
+  );
+
   sysDefs[DIV_SYSTEM_DUMMY]=new DivSysDef(
     "Dummy System", NULL, 0xfd, 0, 8, false, true, 0, false,
     "this is a system designed for testing purposes.",

src/gui/sysConf.cpp

@@ -608,12 +608,34 @@ void FurnaceGUI::drawSysConf(int chan, DivSystem type, unsigned int& flags, bool
       }
       break;
     }
+    case DIV_SYSTEM_PCM_DAC: {
+      int sampRate=(flags&65535)+1;
+      int bitDepth=((flags>>16)&15)+1;
+      bool stereo=(flags>>20)&1;
+      ImGui::Text("Output rate:");
+      if (CWSliderInt("##SampRate",&sampRate,1,65536)) {
+        if (sampRate<1) sampRate=1;
+        if (sampRate>65536) sampRate=65536;
+        copyOfFlags=(flags&(~65535))|(sampRate-1);
+      } rightClickable
+      ImGui::Text("Output depth:");
+      if (CWSliderInt("##BitDepth",&bitDepth,1,16)) {
+        if (bitDepth<1) bitDepth=1;
+        if (bitDepth>16) bitDepth=16;
+        copyOfFlags=(flags&(~(15<<16)))|((bitDepth-1)<<16);
+      } rightClickable
+      if (ImGui::Checkbox("Stereo",&stereo)) {
+        copyOfFlags=(flags&(~(1<<20)))|(stereo<<20);
+      }
+      break;
+    }
     case DIV_SYSTEM_GB:
     case DIV_SYSTEM_SWAN:
     case DIV_SYSTEM_VERA:
     case DIV_SYSTEM_BUBSYS_WSG:
     case DIV_SYSTEM_YMU759:
     case DIV_SYSTEM_PET:
+    case DIV_SYSTEM_T6W28:
       ImGui::Text("nothing to configure");
       break;
     default: