newVolumeScaling, part 4 (final)

TODO.md

@@ -3,8 +3,6 @@
 - additional YM2612 features
   - CSM
 - MSM6258 pitch and clock select
-- the last compat flags
-  - newVolumeScaling
 - collapse/expand pattern and song
 - Game Boy envelope macro/sequence
 - rewrite the system name detection function anyway

src/engine/platform/fds.cpp

@@ -139,7 +139,7 @@ void DivPlatformFDS::tick(bool sysTick) {
     chan[i].std.next();
     if (chan[i].std.vol.had) {
       // ok, why are the volumes like that?
-      chan[i].outVol=MIN(32,chan[i].std.vol.val)-(32-MIN(32,chan[i].vol));
+      chan[i].outVol=VOL_SCALE_LINEAR_BROKEN(chan[i].vol,chan[i].std.vol.val,32);
       if (chan[i].outVol<0) chan[i].outVol=0;
       rWrite(0x4080,0x80|chan[i].outVol);
     }

src/engine/platform/mmc5.cpp

@@ -107,7 +107,7 @@ void DivPlatformMMC5::tick(bool sysTick) {
     chan[i].std.next();
     if (chan[i].std.vol.had) {
       // ok, why are the volumes like that?
-      chan[i].outVol=MIN(15,chan[i].std.vol.val)-(15-(chan[i].vol&15));
+      chan[i].outVol=VOL_SCALE_LINEAR_BROKEN(chan[i].vol&15,MIN(15,chan[i].std.vol.val),15);
       if (chan[i].outVol<0) chan[i].outVol=0;
       rWrite(0x5000+i*4,0x30|chan[i].outVol|((chan[i].duty&3)<<6));
     }

src/engine/platform/nes.cpp

@@ -230,7 +230,7 @@ void DivPlatformNES::tick(bool sysTick) {
     chan[i].std.next();
     if (chan[i].std.vol.had) {
       // ok, why are the volumes like that?
-      chan[i].outVol=MIN(15,chan[i].std.vol.val)-(15-(chan[i].vol&15));
+      chan[i].outVol=VOL_SCALE_LINEAR_BROKEN(chan[i].vol&15,MIN(15,chan[i].std.vol.val),15);
       if (chan[i].outVol<0) chan[i].outVol=0;
       if (i==2) { // triangle
         rWrite(0x4000+i*4,(chan[i].outVol==0)?0:255);

src/engine/platform/pce.cpp

@@ -154,7 +154,7 @@ void DivPlatformPCE::tick(bool sysTick) {
   for (int i=0; i<6; i++) {
     chan[i].std.next();
     if (chan[i].std.vol.had) {
-      chan[i].outVol=((chan[i].vol&31)*MIN(31,chan[i].std.vol.val))>>5;
+      chan[i].outVol=VOL_SCALE_LOG(chan[i].vol&31,MIN(31,chan[i].std.vol.val),31);
       if (chan[i].furnaceDac && chan[i].pcm) {
         // ignore for now
       } else {

src/engine/platform/saa.cpp

@@ -136,7 +136,7 @@ void DivPlatformSAA1099::tick(bool sysTick) {
   for (int i=0; i<6; i++) {
     chan[i].std.next();
     if (chan[i].std.vol.had) {
-      chan[i].outVol=MIN(15,chan[i].std.vol.val)-(15-(chan[i].vol&15));
+      chan[i].outVol=VOL_SCALE_LINEAR_BROKEN(chan[i].vol&15,MIN(15,chan[i].std.vol.val),15);
       if (chan[i].outVol<0) chan[i].outVol=0;
       if (isMuted[i]) {
         rWrite(i,0);

src/engine/platform/tia.cpp

@@ -88,7 +88,7 @@ void DivPlatformTIA::tick(bool sysTick) {
   for (int i=0; i<2; i++) {
     chan[i].std.next();
     if (chan[i].std.vol.had) {
-      chan[i].outVol=MIN(15,chan[i].std.vol.val)-(15-(chan[i].vol&15));
+      chan[i].outVol=VOL_SCALE_LINEAR_BROKEN(chan[i].vol&15,MIN(15,chan[i].std.vol.val),15);
       if (chan[i].outVol<0) chan[i].outVol=0;
       if (isMuted[i]) {
         rWrite(0x19+i,0);