license info for PicoDrive directory

[cyclone68000.git] / PicoDrive / Emulate.cpp

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// This file is part of the PicoDrive Megadrive Emulator\r
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// This code is licensed under the GNU General Public License version 2.0 and the MAME License.\r
// You can choose the license that has the most advantages for you.\r
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// SVN repository can be found at http://code.google.com/p/cyclone68000/\r
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#include "stdafx.h"\r
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TCHAR RomName[260]={0};\r
static unsigned char *RomData=NULL;\r
static unsigned int RomSize=0;\r
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static unsigned int LastSecond=0;\r
static int FramesDone=0;\r
static int FramesPerSecond=60;\r
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struct Target Targ;\r
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static int TargetInit()\r
{\r
  RECT rect={0,0,0,0};\r
  int height=0;\r
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  memset(&Targ,0,sizeof(Targ));\r
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  height=168;\r
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  ClientToScreen(FrameWnd,&Targ.point);\r
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  GetClientRect(FrameWnd,&rect);\r
  // Find out where the top of the screen should go:\r
  rect.top=(rect.bottom-height)>>1;\r
  if (rect.top<0) rect.top=0;\r
  rect.bottom=rect.top+height;\r
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  Targ.view=rect; // Save the view rectangle (client coordinates)\r
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  Targ.offset=Targ.view.top+Targ.point.y;\r
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  return 0;\r
}\r
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static int TargetUpdate()\r
{\r
  // Need to repaint the view rectangle:\r
  GetUpdateRect(FrameWnd,&Targ.update,0);\r
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  Targ.top   =Targ.update.top   +Targ.point.y;\r
  Targ.bottom=Targ.update.bottom+Targ.point.y;\r
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  return 0;\r
}\r
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int EmulateInit()\r
{\r
  FILE *f=NULL;\r
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  EmulateExit(); // Make sure exited\r
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  TargetInit(); // Find out where to put the screen\r
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  PicoInit();\r
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  // Load cartridge\r
  f=_wfopen(RomName,L"rb"); if (f==NULL) return 1;\r
  PicoCartLoad(f,&RomData,&RomSize);\r
  fclose(f);\r
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  PicoCartInsert(RomData,RomSize);\r
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  LastSecond=GetTickCount(); FramesDone=0;\r
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  return 0;\r
}\r
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void EmulateExit()\r
{\r
  // Remove cartridge\r
  PicoCartInsert(NULL,0);\r
  if (RomData) free(RomData); RomData=NULL; RomSize=0;\r
  \r
  PicoExit();\r
}\r
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// Callback for scanline data:\r
static int EmulateScan(unsigned int scan,unsigned short *sdata)\r
{\r
  int len=0;\r
  unsigned short *ps=NULL,*end=NULL;\r
  unsigned char *pd=NULL;\r
  int xpitch=0;\r
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  if ((scan&3)==1) return 0;\r
  scan+=scan<<1; scan>>=2; // Reduce size to 75%\r
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  scan+=Targ.offset;\r
  if ((int)scan< Targ.top) return 0; // Out of range\r
  if ((int)scan>=Targ.bottom) return 0; // Out of range\r
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  pd=Targ.screen+scan*GXDisp.cbyPitch;\r
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  len=240;\r
  xpitch=GXDisp.cbxPitch;\r
  ps=sdata; end=ps+320;\r
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  // Reduce 4 pixels into 3\r
  do\r
  {\r
    *(unsigned short *)pd=ps[0]; pd+=xpitch;\r
    *(unsigned short *)pd=(unsigned short)((ps[1]+ps[2])>>1); pd+=xpitch;\r
    *(unsigned short *)pd=ps[3]; pd+=xpitch;\r
    ps+=4;\r
  }\r
  while (ps<end);\r
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  return 0;\r
}\r
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static int DoFrame()\r
{\r
  int pad=0,i=0,ks=0;\r
  char map[8]={0,1,2,3,5,6,4,7}; // u/d/l/r/b/c/a/start\r
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  for (i=0;i<8;i++)\r
  {\r
    ks=GetAsyncKeyState(Config.key[map[i]]);\r
    if (ks) pad|=1<<i;\r
  }\r
  PicoPad[0]=pad;\r
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  PicoFrame();\r
  return 0;\r
}\r
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static int DrawFrame()\r
{\r
  // Now final frame is drawn:\r
  InvalidateRect(FrameWnd,&Targ.view,0);\r
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  if (Main3800) Targ.screen=(unsigned char *)0xac0755a0; // The real 3800 screen address\r
  else          Targ.screen=(unsigned char *)GXBeginDraw();\r
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  if (Targ.screen==NULL) return 1;\r
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  TargetUpdate();\r
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  PicoScan=EmulateScan; // Setup scanline callback\r
  DoFrame();\r
  PicoScan=NULL;\r
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  \r
  if (Main3800==0) GXEndDraw();\r
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  Targ.screen=NULL;\r
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  ValidateRect(FrameWnd,&Targ.update);\r
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  if (PicoStatus[0])\r
  {\r
    // Print the status of the 68000:\r
    HDC hdc=GetDC(FrameWnd);\r
    RECT rect={0,220, 240,260};\r
    TCHAR status[128]={0};\r
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    wsprintf(status,L"%.120S",PicoStatus);\r
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    FillRect(hdc,&rect,(HBRUSH)GetStockObject(WHITE_BRUSH));\r
    SetBkMode(hdc,TRANSPARENT);\r
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    DrawText(hdc,status,lstrlen(status),&rect,0);\r
    ReleaseDC(FrameWnd,hdc);\r
  }\r
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  return 0;\r
}\r
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int EmulateFrame()\r
{\r
  int i=0,need=0;\r
  int time=0,frame=0;\r
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  if (RomData==NULL) return 1;\r
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  // Speed throttle:\r
  time=GetTickCount()-LastSecond; // This will be about 0-1000 ms\r
  frame=time*FramesPerSecond/1000;\r
  need=frame-FramesDone;\r
  FramesDone=frame;\r
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  if (FramesPerSecond>0)\r
  {\r
    // Carry over any >60 frame count to one second\r
    while (FramesDone>=FramesPerSecond) { FramesDone-=FramesPerSecond; LastSecond+=1000; }\r
  }\r
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  if (need<=0) { Sleep(2); return 1; }\r
  if (need>4) need=4; // Limit frame skipping\r
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  for (i=0;i<need-1;i++) DoFrame(); // Frame skip if needed\r
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  DrawFrame();\r
  return 0;\r
}\r
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int SndRender()\r
{\r
//  int p=0;\r
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  PsndRate=WaveRate;\r
  PsndLen=WaveLen;\r
  PsndOut=WaveDest;\r
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  DrawFrame();\r
  // Convert to signed:\r
//  for (p=0;p<PsndLen<<1;p++) PsndOut[p]+=0x8000;\r
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  PsndRate=PsndLen=0;\r
  PsndOut=NULL;\r
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  return 0;\r
}\r