new z80 scheduling method, timers are still wip

[picodrive.git] / Pico / sound / sound.c

diff --git a/Pico/sound/sound.c b/Pico/sound/sound.c
index 1d6c168..6c7c6d8 100644 (file)
--- a/Pico/sound/sound.c
+++ b/Pico/sound/sound.c
@@ -21,7 +21,7 @@ void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_ster
 static int PsndBuffer[2*44100/50];\r
 \r
 // dac\r
-static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r
+static unsigned short dac_info[312+4]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r
 \r
 // cdda output buffer\r
 short cdda_out_buffer[2*1152];\r
@@ -31,8 +31,13 @@ int PsndRate=0;
 int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r
 int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60\r
 int PsndLen_exc_cnt=0;\r
+int PsndDacLine=0;\r
 short *PsndOut=NULL; // PCM data buffer\r
 \r
+// timers\r
+int timer_a_next_oflow, timer_a_step; // in z80 cycles\r
+//int\r
+\r
 // sn76496\r
 extern int *sn76496_regs;\r
 \r
@@ -83,6 +88,8 @@ static void dac_recalculate(void)
     if (PsndLen_exc_add) len++;\r
     dac_info[224] = (pos<<4)|len;\r
   }\r
+  for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)\r
+    dac_info[i] = 0;\r
   //for(i=len=0; i < lines; i++) {\r
   //  printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);\r
   //  len+=dac_info[i]&0xf;\r
@@ -100,7 +107,7 @@ PICO_INTERNAL void PsndReset(void)
   // also clear the internal registers+addr line\r
   ym2612_regs = YM2612GetRegs();\r
   memset(ym2612_regs, 0, 0x200+4);\r
-  z80startCycle = z80stopCycle = 0;\r
+  timers_reset();\r
 \r
   PsndRerate(0);\r
 }\r
@@ -164,44 +171,25 @@ void PsndRerate(int preserve_state)
 }\r
 \r
 \r
-// This is called once per raster (aka line), but not necessarily for every line\r
-PICO_INTERNAL void Psnd_timers_and_dac(int raster)\r
+PICO_INTERNAL void PsndDoDAC(int line_to)\r
 {\r
-  int pos, len;\r
-  int do_dac = PsndOut && (PicoOpt&POPT_EN_FM) && *ym2612_dacen;\r
-//  int do_pcm = PsndOut && (PicoAHW&1) && (PicoOpt&0x400);\r
-\r
-  // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)\r
-  YM2612PicoTick(1);\r
+  int pos, pos1, len;\r
+  int dout = ym2612.dacout;\r
+  int line_from = PsndDacLine;\r
 \r
-  if (!do_dac /*&& !do_pcm*/) return;\r
+  PsndDacLine = line_to + 1;\r
 \r
-  pos=dac_info[raster], len=pos&0xf;\r
+  pos =dac_info[line_from]>>4;\r
+  pos1=dac_info[line_to];\r
+  len = ((pos1>>4)-pos) + (pos1&0xf);\r
   if (!len) return;\r
 \r
-  pos>>=4;\r
-\r
-  if (do_dac)\r
-  {\r
+  if (PicoOpt & POPT_EN_STEREO) {\r
     short *d = PsndOut + pos*2;\r
-    int dout = *ym2612_dacout;\r
-    if(PicoOpt&POPT_EN_STEREO) {\r
-      // some manual loop unrolling here :)\r
-      d[0] = dout;\r
-      if (len > 1) {\r
-        d[2] = dout;\r
-        if (len > 2)\r
-          d[4] = dout;\r
-      }\r
-    } else {\r
-      short *d = PsndOut + pos;\r
-      d[0] = dout;\r
-      if (len > 1) {\r
-        d[1] = dout;\r
-        if (len > 2)\r
-          d[2] = dout;\r
-      }\r
-    }\r
+    for (; len > 0; len--, d+=2) *d = dout;\r
+  } else {\r
+    short *d = PsndOut + pos;\r
+    for (; len > 0; len--, d++)  *d = dout;\r
   }\r
 \r
 #if 0\r