X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=Pico%2FVideoPort.c;h=e3643df8879b88f330d4df68bee7e1ec3f0093e9;hb=3a81ecde1cf95372e27a3e6ca6f9c2cccc86e272;hp=527f2f037b4d68bd7ca609c31ec9c87ef9685e72;hpb=672ad671130bb662f099b790fdaef4be85e6c146;p=picodrive.git

diff --git a/Pico/VideoPort.c b/Pico/VideoPort.c
index 527f2f0..e3643df 100644
--- a/Pico/VideoPort.c
+++ b/Pico/VideoPort.c
@@ -14,6 +14,7 @@ extern const unsigned char  hcounts_40[];
 extern const unsigned short vcounts[];
 extern int rendstatus;
 
+typedef unsigned char  u8;
 typedef unsigned short u16;
 
 
@@ -93,28 +94,69 @@ static void DmaSlow(int len)
     SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));
   }
 
-  if ((source&0xe00000)==0xe00000) { pd=(u16 *)(Pico.ram+(source&0xfffe)); pdend=(u16 *)(Pico.ram+0x10000); } // Ram
-  else if(PicoMCD & 1) {
-    if(source<0x20000) { pd=(u16 *)(Pico_mcd->bios+(source&~1)); pdend=(u16 *)(Pico_mcd->bios+0x20000); } // Bios area
-    else { dprintf("unsupported src"); return; } // Invalid source address
+  if ((source&0xe00000)==0xe00000) { // Ram
+    pd=(u16 *)(Pico.ram+(source&0xfffe));
+    pdend=(u16 *)(Pico.ram+0x10000);
+  } else if(PicoMCD & 1) {
+    dprintf("DmaSlow CD");
+    if(source<0x20000) { // Bios area
+      pd=(u16 *)(Pico_mcd->bios+(source&~1));
+      pdend=(u16 *)(Pico_mcd->bios+0x20000);
+    } else if ((source&0xfc0000)==0x200000 && (!(Pico_mcd->s68k_regs[3]&4))) { // Word Ram
+      if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode
+        source -= 2;
+        pd=(u16 *)(Pico_mcd->word_ram+(source&0x3fffe));
+        pdend=(u16 *)(Pico_mcd->word_ram+0x40000);
+      } else {
+        dprintf("DmaSlow: unsupported src");
+	return;
+      }
+    } else if ((source&0xfe0000)==0x020000) { // Prg Ram
+      u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
+      pd=(u16 *)(prg_ram+(source&0x1fffe));
+      pdend=(u16 *)(prg_ram+0x20000);
+    } else {
+      dprintf("DmaSlow: unsupported src");
+      return;
+    }
   } else {
-    if(source<Pico.romsize) { pd=(u16 *)(Pico.rom+(source&~1)); pdend=(u16 *)(Pico.rom+Pico.romsize); } // Rom
-    else { dprintf("invalid dma src"); return; } // Invalid source address
+    if(source<Pico.romsize) { // Rom
+      pd=(u16 *)(Pico.rom+(source&~1));
+      pdend=(u16 *)(Pico.rom+Pico.romsize);
+    } else {
+      dprintf("DmaSlow: invalid dma src");
+      return;
+    }
+  }
+
+  // overflow protection, might break something..
+  if (len > pdend - pd) {
+    len = pdend - pd;
+    dprintf("DmaSlow overflow");
   }
 
   switch (Pico.video.type)
   {
     case 1: // vram
       r = Pico.vram;
-      for(; len; len--)
+      if (inc == 2 && !(a&1) && a+len*2 < 0x10000)
       {
-        d=*pd++;
-        if(a&1) d=(d<<8)|(d>>8);
-        r[a>>1] = (u16)d; // will drop the upper bits
-        // AutoIncrement
-        a=(u16)(a+inc);
-        // didn't src overlap?
-        if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
+        // most used DMA mode
+	memcpy16(r + (a>>1), pd, len);
+	a += len*2;
+      }
+      else
+      {
+        for(; len; len--)
+        {
+          d=*pd++;
+          if(a&1) d=(d<<8)|(d>>8);
+          r[a>>1] = (u16)d; // will drop the upper bits
+          // AutoIncrement
+          a=(u16)(a+inc);
+          // didn't src overlap?
+          //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
+        }
       }
       rendstatus|=0x10;
       break;
@@ -128,7 +170,7 @@ static void DmaSlow(int len)
         // AutoIncrement
         a2+=inc;
         // didn't src overlap?
-        if(pd >= pdend) pd-=0x8000;
+        //if(pd >= pdend) pd-=0x8000;
         // good dest?
         if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis
       }
@@ -143,7 +185,7 @@ static void DmaSlow(int len)
         // AutoIncrement
         a2+=inc;
         // didn't src overlap?
-        if(pd >= pdend) pd-=0x8000;
+        //if(pd >= pdend) pd-=0x8000;
         // good dest?
         if(a2 >= 0x80) break;
       }
@@ -359,7 +401,7 @@ unsigned int PicoVideoRead(unsigned int a)
     if(Pico.m.rotate++&8) d|=0x0100; else d|=0x0200; // Toggle fifo full empty (who uses that stuff?)
     if(!(Pico.video.reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled
     if(SekCyclesLeft < 84+4)      d|=0x0004; // H-Blank (Sonic3 vs)
-    dprintf("sr_read %04x @ %06x [%i|%i]", d, SekPc, Pico.m.scanline, SekCyclesDone());
+    // dprintf("sr_read %04x @ %06x [%i|%i]", d, SekPc, Pico.m.scanline, SekCyclesDone());
 
     Pico.video.pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)