| 1 | \r |
| 2 | // This file is part of the PicoDrive Megadrive Emulator\r |
| 3 | \r |
| 4 | // Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\r |
| 5 | \r |
| 6 | // This code is licensed under the GNU General Public License version 2.0 and the MAME License.\r |
| 7 | // You can choose the license that has the most advantages for you.\r |
| 8 | \r |
| 9 | // SVN repository can be found at http://code.google.com/p/cyclone68000/\r |
| 10 | \r |
| 11 | #include "stdafx.h"\r |
| 12 | \r |
| 13 | TCHAR RomName[260]={0};\r |
| 14 | static unsigned char *RomData=NULL;\r |
| 15 | static unsigned int RomSize=0;\r |
| 16 | \r |
| 17 | static unsigned int LastSecond=0;\r |
| 18 | static int FramesDone=0;\r |
| 19 | static int FramesPerSecond=60;\r |
| 20 | \r |
| 21 | struct Target Targ;\r |
| 22 | \r |
| 23 | static int TargetInit()\r |
| 24 | {\r |
| 25 | RECT rect={0,0,0,0};\r |
| 26 | int height=0;\r |
| 27 | \r |
| 28 | memset(&Targ,0,sizeof(Targ));\r |
| 29 | \r |
| 30 | height=168;\r |
| 31 | \r |
| 32 | ClientToScreen(FrameWnd,&Targ.point);\r |
| 33 | \r |
| 34 | GetClientRect(FrameWnd,&rect);\r |
| 35 | // Find out where the top of the screen should go:\r |
| 36 | rect.top=(rect.bottom-height)>>1;\r |
| 37 | if (rect.top<0) rect.top=0;\r |
| 38 | rect.bottom=rect.top+height;\r |
| 39 | \r |
| 40 | Targ.view=rect; // Save the view rectangle (client coordinates)\r |
| 41 | \r |
| 42 | Targ.offset=Targ.view.top+Targ.point.y;\r |
| 43 | \r |
| 44 | return 0;\r |
| 45 | }\r |
| 46 | \r |
| 47 | static int TargetUpdate()\r |
| 48 | {\r |
| 49 | // Need to repaint the view rectangle:\r |
| 50 | GetUpdateRect(FrameWnd,&Targ.update,0);\r |
| 51 | \r |
| 52 | Targ.top =Targ.update.top +Targ.point.y;\r |
| 53 | Targ.bottom=Targ.update.bottom+Targ.point.y;\r |
| 54 | \r |
| 55 | return 0;\r |
| 56 | }\r |
| 57 | \r |
| 58 | int EmulateInit()\r |
| 59 | {\r |
| 60 | FILE *f=NULL;\r |
| 61 | \r |
| 62 | EmulateExit(); // Make sure exited\r |
| 63 | \r |
| 64 | TargetInit(); // Find out where to put the screen\r |
| 65 | \r |
| 66 | PicoInit();\r |
| 67 | \r |
| 68 | // Load cartridge\r |
| 69 | f=_wfopen(RomName,L"rb"); if (f==NULL) return 1;\r |
| 70 | PicoCartLoad(f,&RomData,&RomSize);\r |
| 71 | fclose(f);\r |
| 72 | \r |
| 73 | PicoCartInsert(RomData,RomSize);\r |
| 74 | \r |
| 75 | LastSecond=GetTickCount(); FramesDone=0;\r |
| 76 | \r |
| 77 | return 0;\r |
| 78 | }\r |
| 79 | \r |
| 80 | void EmulateExit()\r |
| 81 | {\r |
| 82 | // Remove cartridge\r |
| 83 | PicoCartInsert(NULL,0);\r |
| 84 | if (RomData) free(RomData); RomData=NULL; RomSize=0;\r |
| 85 | \r |
| 86 | PicoExit();\r |
| 87 | }\r |
| 88 | \r |
| 89 | // Callback for scanline data:\r |
| 90 | static int EmulateScan(unsigned int scan,unsigned short *sdata)\r |
| 91 | {\r |
| 92 | int len=0;\r |
| 93 | unsigned short *ps=NULL,*end=NULL;\r |
| 94 | unsigned char *pd=NULL;\r |
| 95 | int xpitch=0;\r |
| 96 | \r |
| 97 | if ((scan&3)==1) return 0;\r |
| 98 | scan+=scan<<1; scan>>=2; // Reduce size to 75%\r |
| 99 | \r |
| 100 | scan+=Targ.offset;\r |
| 101 | if ((int)scan< Targ.top) return 0; // Out of range\r |
| 102 | if ((int)scan>=Targ.bottom) return 0; // Out of range\r |
| 103 | \r |
| 104 | pd=Targ.screen+scan*GXDisp.cbyPitch;\r |
| 105 | \r |
| 106 | len=240;\r |
| 107 | xpitch=GXDisp.cbxPitch;\r |
| 108 | ps=sdata; end=ps+320;\r |
| 109 | \r |
| 110 | // Reduce 4 pixels into 3\r |
| 111 | do\r |
| 112 | {\r |
| 113 | *(unsigned short *)pd=ps[0]; pd+=xpitch;\r |
| 114 | *(unsigned short *)pd=(unsigned short)((ps[1]+ps[2])>>1); pd+=xpitch;\r |
| 115 | *(unsigned short *)pd=ps[3]; pd+=xpitch;\r |
| 116 | ps+=4;\r |
| 117 | }\r |
| 118 | while (ps<end);\r |
| 119 | \r |
| 120 | return 0;\r |
| 121 | }\r |
| 122 | \r |
| 123 | static int DoFrame()\r |
| 124 | {\r |
| 125 | int pad=0,i=0,ks=0;\r |
| 126 | char map[8]={0,1,2,3,5,6,4,7}; // u/d/l/r/b/c/a/start\r |
| 127 | \r |
| 128 | for (i=0;i<8;i++)\r |
| 129 | {\r |
| 130 | ks=GetAsyncKeyState(Config.key[map[i]]);\r |
| 131 | if (ks) pad|=1<<i;\r |
| 132 | }\r |
| 133 | PicoPad[0]=pad;\r |
| 134 | \r |
| 135 | PicoFrame();\r |
| 136 | return 0;\r |
| 137 | }\r |
| 138 | \r |
| 139 | static int DrawFrame()\r |
| 140 | {\r |
| 141 | // Now final frame is drawn:\r |
| 142 | InvalidateRect(FrameWnd,&Targ.view,0);\r |
| 143 | \r |
| 144 | if (Main3800) Targ.screen=(unsigned char *)0xac0755a0; // The real 3800 screen address\r |
| 145 | else Targ.screen=(unsigned char *)GXBeginDraw();\r |
| 146 | \r |
| 147 | if (Targ.screen==NULL) return 1;\r |
| 148 | \r |
| 149 | TargetUpdate();\r |
| 150 | \r |
| 151 | PicoScan=EmulateScan; // Setup scanline callback\r |
| 152 | DoFrame();\r |
| 153 | PicoScan=NULL;\r |
| 154 | \r |
| 155 | \r |
| 156 | \r |
| 157 | if (Main3800==0) GXEndDraw();\r |
| 158 | \r |
| 159 | Targ.screen=NULL;\r |
| 160 | \r |
| 161 | ValidateRect(FrameWnd,&Targ.update);\r |
| 162 | \r |
| 163 | if (PicoStatus[0])\r |
| 164 | {\r |
| 165 | // Print the status of the 68000:\r |
| 166 | HDC hdc=GetDC(FrameWnd);\r |
| 167 | RECT rect={0,220, 240,260};\r |
| 168 | TCHAR status[128]={0};\r |
| 169 | \r |
| 170 | wsprintf(status,L"%.120S",PicoStatus);\r |
| 171 | \r |
| 172 | FillRect(hdc,&rect,(HBRUSH)GetStockObject(WHITE_BRUSH));\r |
| 173 | SetBkMode(hdc,TRANSPARENT);\r |
| 174 | \r |
| 175 | DrawText(hdc,status,lstrlen(status),&rect,0);\r |
| 176 | ReleaseDC(FrameWnd,hdc);\r |
| 177 | }\r |
| 178 | \r |
| 179 | return 0;\r |
| 180 | }\r |
| 181 | \r |
| 182 | int EmulateFrame()\r |
| 183 | {\r |
| 184 | int i=0,need=0;\r |
| 185 | int time=0,frame=0;\r |
| 186 | \r |
| 187 | if (RomData==NULL) return 1;\r |
| 188 | \r |
| 189 | // Speed throttle:\r |
| 190 | time=GetTickCount()-LastSecond; // This will be about 0-1000 ms\r |
| 191 | frame=time*FramesPerSecond/1000;\r |
| 192 | need=frame-FramesDone;\r |
| 193 | FramesDone=frame;\r |
| 194 | \r |
| 195 | if (FramesPerSecond>0)\r |
| 196 | {\r |
| 197 | // Carry over any >60 frame count to one second\r |
| 198 | while (FramesDone>=FramesPerSecond) { FramesDone-=FramesPerSecond; LastSecond+=1000; }\r |
| 199 | }\r |
| 200 | \r |
| 201 | if (need<=0) { Sleep(2); return 1; }\r |
| 202 | if (need>4) need=4; // Limit frame skipping\r |
| 203 | \r |
| 204 | for (i=0;i<need-1;i++) DoFrame(); // Frame skip if needed\r |
| 205 | \r |
| 206 | DrawFrame();\r |
| 207 | return 0;\r |
| 208 | }\r |
| 209 | \r |
| 210 | int SndRender()\r |
| 211 | {\r |
| 212 | // int p=0;\r |
| 213 | \r |
| 214 | PsndRate=WaveRate;\r |
| 215 | PsndLen=WaveLen;\r |
| 216 | PsndOut=WaveDest;\r |
| 217 | \r |
| 218 | DrawFrame();\r |
| 219 | // Convert to signed:\r |
| 220 | // for (p=0;p<PsndLen<<1;p++) PsndOut[p]+=0x8000;\r |
| 221 | \r |
| 222 | PsndRate=PsndLen=0;\r |
| 223 | PsndOut=NULL;\r |
| 224 | \r |
| 225 | return 0;\r |
| 226 | }\r |