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1 | \r |
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2 | // This file is part of the PicoDrive Megadrive Emulator\r |
3 | \r |
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4 | // Copyright (c) 2011 FinalDave (emudave (at) gmail.com)\r |
5 | \r |
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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 |
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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 |