X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=pico%2Fcd%2Fgfx_dma.c;fp=pico%2Fcd%2Fgfx_dma.c;h=44fa7ab2f7fef1dc521639bb86976950af4e130b;hb=a93a80deda2211dc89ea543841e71cdaf6f65917;hp=0000000000000000000000000000000000000000;hpb=e53f0499fe2337c5efea7443d6e2322887cae593;p=picodrive.git

diff --git a/pico/cd/gfx_dma.c b/pico/cd/gfx_dma.c
new file mode 100644
index 0000000..44fa7ab
--- /dev/null
+++ b/pico/cd/gfx_dma.c
@@ -0,0 +1,79 @@
+/*
+ * PicoDrive
+ * (C) notaz, 2007
+ *
+ * This work is licensed under the terms of MAME license.
+ * See COPYING file in the top-level directory.
+ */
+
+#include "../pico_int.h"
+
+#include "cell_map.c"
+
+#ifndef UTYPES_DEFINED
+typedef unsigned short u16;
+#endif
+
+// check: Heart of the alien, jaguar xj 220
+PICO_INTERNAL void DmaSlowCell(unsigned int source, unsigned int a, int len, unsigned char inc)
+{
+  unsigned char *base;
+  unsigned int asrc, a2;
+  u16 *r;
+
+  base = Pico_mcd->word_ram1M[Pico_mcd->s68k_regs[3]&1];
+
+  switch (Pico.video.type)
+  {
+    case 1: // vram
+      r = Pico.vram;
+      for(; len; len--)
+      {
+        asrc = cell_map(source >> 2) << 2;
+        asrc |= source & 2;
+        // if(a&1) d=(d<<8)|(d>>8); // ??
+        r[a>>1] = *(u16 *)(base + asrc);
+	source += 2;
+        // AutoIncrement
+        a=(u16)(a+inc);
+      }
+      rendstatus |= PDRAW_SPRITES_MOVED;
+      break;
+
+    case 3: // cram
+      Pico.m.dirtyPal = 1;
+      r = Pico.cram;
+      for(a2=a&0x7f; len; len--)
+      {
+        asrc = cell_map(source >> 2) << 2;
+        asrc |= source & 2;
+        r[a2>>1] = *(u16 *)(base + asrc);
+	source += 2;
+        // AutoIncrement
+        a2+=inc;
+        // good dest?
+        if(a2 >= 0x80) break;
+      }
+      a=(a&0xff00)|a2;
+      break;
+
+    case 5: // vsram[a&0x003f]=d;
+      r = Pico.vsram;
+      for(a2=a&0x7f; len; len--)
+      {
+        asrc = cell_map(source >> 2) << 2;
+        asrc |= source & 2;
+        r[a2>>1] = *(u16 *)(base + asrc);
+	source += 2;
+        // AutoIncrement
+        a2+=inc;
+        // good dest?
+        if(a2 >= 0x80) break;
+      }
+      a=(a&0xff00)|a2;
+      break;
+  }
+  // remember addr
+  Pico.video.addr=(u16)a;
+}
+