From 075672bf9f028490174bd3fbebe957a47a10b09d Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sun, 22 Oct 2017 00:39:43 +0300
Subject: [PATCH] sms: do psg like md does

---
 pico/sms.c         | 16 ++++++++++------
 pico/sound/sound.c |  9 ++++-----
 2 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/pico/sms.c b/pico/sms.c
index 748c326..6955a7d 100644
--- a/pico/sms.c
+++ b/pico/sms.c
@@ -8,10 +8,8 @@
 /*
  * TODO:
  * - start in a state as if BIOS ran
- * - remaining status flags (OVR/COL)
  * - RAM support in mapper
  * - region support
- * - SN76496 DAC-like usage
  * - H counter
  */
 #include "pico_int.h"
@@ -133,8 +131,9 @@ static void z80_sms_out(unsigned short a, unsigned char d)
 
     case 0x40:
     case 0x41:
-      if (PicoIn.opt & POPT_EN_PSG)
-        SN76496Write(d);
+      if ((d & 0x90) == 0x90 && PsndPsgLine < Pico.m.scanline)
+        PsndDoPSG(Pico.m.scanline);
+      SN76496Write(d);
       break;
 
     case 0x80:
@@ -300,12 +299,16 @@ void PicoFrameMS(void)
       }
     }
 
+    // 224 because of how it's done for MD...
+    if (y == 224 && PsndOut)
+      PsndGetSamplesMS();
+
     cycles_aim += cycles_line;
     cycles_done += z80_run((cycles_aim - cycles_done) >> 8) << 8;
   }
 
-  if (PsndOut)
-    PsndGetSamplesMS();
+  if (PsndOut && PsndPsgLine < lines)
+    PsndDoPSG(lines - 1);
 }
 
 void PicoFrameDrawOnlyMS(void)
@@ -319,3 +322,4 @@ void PicoFrameDrawOnlyMS(void)
     PicoLineMode4(y);
 }
 
+// vim:ts=2:sw=2:expandtab
diff --git a/pico/sound/sound.c b/pico/sound/sound.c
index 56ffe3f..e799e93 100644
--- a/pico/sound/sound.c
+++ b/pico/sound/sound.c
@@ -370,15 +370,12 @@ PICO_INTERNAL void PsndGetSamples(int y)
 
 PICO_INTERNAL void PsndGetSamplesMS(void)
 {
-  int stereo = (PicoIn.opt & 8) >> 3;
   int length = PsndLen_use;
 
-  // PSG
-  if (PicoIn.opt & POPT_EN_PSG)
-    SN76496Update(PsndOut, length, stereo);
+  PsndDoPSG(223);
 
   // upmix to "stereo" if needed
-  if (stereo) {
+  if (PicoIn.opt & POPT_EN_STEREO) {
     int i, *p;
     for (i = length, p = (void *)PsndOut; i > 0; i--, p++)
       *p |= *p << 16;
@@ -387,6 +384,8 @@ PICO_INTERNAL void PsndGetSamplesMS(void)
   if (PicoWriteSound != NULL)
     PicoWriteSound(length * ((PicoIn.opt & POPT_EN_STEREO) ? 4 : 2));
   PsndClear();
+
+  dac_info[224] = 0;
 }
 
 // vim:shiftwidth=2:ts=2:expandtab
-- 
2.39.2