spu: get rid of iSPUIRQWait

[pcsx_rearmed.git] / plugins / dfsound / spu.c

diff --git a/plugins/dfsound/spu.c b/plugins/dfsound/spu.c
index b087cdf..4759f3f 100644 (file)
--- a/plugins/dfsound/spu.c
+++ b/plugins/dfsound/spu.c
@@ -46,6 +46,8 @@
  } while (0)
 #endif
 
+#define PSXCLK 33868800        /* 33.8688 MHz */
+
 /*
 #if defined (USEMACOSX)
 static char * libraryName     = N_("Mac OS X Sound");
@@ -79,9 +81,6 @@ unsigned char * pMixIrq=0;
 
 int             iVolume=768; // 1024 is 1.0
 int             iXAPitch=1;
-int             iSPUIRQWait=1;
-int             iDebugMode=0;
-int             iRecordMode=0;
 int             iUseReverb=2;
 int             iUseInterpolation=2;
 
@@ -92,7 +91,6 @@ REVERBInfo      rvb;
 
 unsigned int    dwNoiseVal;                            // global noise generator
 unsigned int    dwNoiseCount;
-int             iSpuAsyncWait=0;
 
 unsigned short  spuCtrl=0;                             // some vars to store psx reg infos
 unsigned short  spuStat=0;
@@ -122,8 +120,10 @@ int iFMod[NSSIZE];
 int iCycle = 0;
 short * pS;
 
+int had_dma;
 int lastch=-1;             // last channel processed on spu irq in timer mode
 static int lastns=0;       // last ns pos
+static int cycles_since_update;
 
 #define CDDA_BUFFER_SIZE (16384 * sizeof(uint32_t)) // must be power of 2
 
@@ -532,7 +532,7 @@ static int do_samples_##name(int ch, int ns, int ns_to) \
    {                                         \
     sbpos = 0;                               \
     d = decode_block(ch);                    \
-    if(d && iSPUIRQWait)                     \
+    if(d)                                    \
     {                                        \
      ret = ns;                               \
      goto out;                               \
@@ -665,7 +665,7 @@ static void mix_chan_rvb(int start, int count, int lv, int rv)
 // basically the whole sound processing is done in this fat func!
 ////////////////////////////////////////////////////////////////////////
 
-static int do_samples(void)
+static int do_samples(int forced_updates)
 {
  int volmult = iVolume;
  int ns,ns_from,ns_to;
@@ -681,11 +681,15 @@ static int do_samples(void)
    // until enuff free place is available/a new channel gets
    // started
 
-   if(!dwNewChannel && SoundGetBytesBuffered())        // still enuff data in sound buffer?
+   if(!forced_updates && SoundGetBytesBuffered())      // still enuff data in sound buffer?
     {
      return 0;
     }
 
+   cycles_since_update = 0;
+   if(forced_updates > 0)
+    forced_updates--;
+
    //--------------------------------------------------// continue from irq handling in timer mode? 
 
    ns_from=0;
@@ -737,7 +741,7 @@ static int do_samples(void)
 
     // advance "stopped" channels that can cause irqs
     // (all chans are always playing on the real thing..)
-    if(!bIRQReturn && (spuCtrl&CTRL_IRQ))
+    if(spuCtrl&CTRL_IRQ)
      for(ch=0;ch<MAXCHAN;ch++)
       {
        if(!(silentch&(1<<ch))) continue;               // already handled
@@ -745,13 +749,13 @@ static int do_samples(void)
        if(s_chan[ch].pCurr > pSpuIrq && s_chan[ch].pLoop > pSpuIrq)
         continue;
 
-       s_chan[ch].spos += s_chan[ch].sinc * NSSIZE;
+       s_chan[ch].spos += s_chan[ch].sinc * (ns_to - ns_from);
        while(s_chan[ch].spos >= 28 * 0x10000)
         {
          unsigned char *start = s_chan[ch].pCurr;
 
          // no need for bIRQReturn since the channel is silent
-         iSpuAsyncWait |= skip_block(ch);
+         skip_block(ch);
          if(start == s_chan[ch].pCurr)
           {
            // looping on self
@@ -764,12 +768,8 @@ static int do_samples(void)
         }
       }
 
-    if(bIRQReturn && iSPUIRQWait)                      // special return for "spu irq - wait for cpu action"
-     {
-      iSpuAsyncWait=1;
-      bIRQReturn=0;
+    if(bIRQReturn)                                     // special return for "spu irq - wait for cpu action"
       return 0;
-     }
 
 
   //---------------------------------------------------//
@@ -863,16 +863,26 @@ static int do_samples(void)
 
 void CALLBACK SPUasync(unsigned long cycle)
 {
+ int forced_updates = 0;
+ int do_update = 0;
+
  if(!bSpuInit) return;                               // -> no init, no call
 
- if(iSpuAsyncWait)
+ cycles_since_update += cycle;
+
+ if(dwNewChannel || had_dma)
   {
-   iSpuAsyncWait++;
-   if(iSpuAsyncWait<=16/FRAG_MSECS) return;
-   iSpuAsyncWait=0;
+   forced_updates = 1;
+   do_update = 1;
+   had_dma = 0;
   }
 
- do_samples();
+ // once per frame should be fine (using a bit more because of BIAS)
+ if(cycles_since_update > PSXCLK/60 * 5/4)
+  do_update = 1;
+
+ if(do_update)
+  do_samples(forced_updates);
 }
 
 // SPU UPDATE... new epsxe func
@@ -988,7 +998,6 @@ long CALLBACK SPUinit(void)
  pMixIrq = 0;
  memset((void *)s_chan, 0, (MAXCHAN + 1) * sizeof(SPUCHAN));
  pSpuIrq = 0;
- //iSPUIRQWait = 0;
  lastch = -1;
 
  SetupStreams();                                       // prepare streaming