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ef79bbde P |
1 | /*************************************************************************** |
2 | fps.c - description | |
3 | ------------------- | |
4 | begin : Sun Oct 28 2001 | |
5 | copyright : (C) 2001 by Pete Bernert | |
6 | email : BlackDove@addcom.de | |
7 | ***************************************************************************/ | |
8 | /*************************************************************************** | |
9 | * * | |
10 | * This program is free software; you can redistribute it and/or modify * | |
11 | * it under the terms of the GNU General Public License as published by * | |
12 | * the Free Software Foundation; either version 2 of the License, or * | |
13 | * (at your option) any later version. See also the license.txt file for * | |
14 | * additional informations. * | |
15 | * * | |
16 | ***************************************************************************/ | |
17 | ||
18 | #define _IN_FPS | |
19 | ||
20 | #include <unistd.h> | |
21 | ||
22 | #include "externals.h" | |
23 | #include "fps.h" | |
24 | #include "gpu.h" | |
25 | ||
26 | // FPS stuff | |
27 | float fFrameRateHz=0; | |
28 | DWORD dwFrameRateTicks=16; | |
29 | float fFrameRate; | |
30 | int iFrameLimit; | |
31 | int UseFrameLimit=0; | |
32 | int UseFrameSkip=0; | |
33 | ||
34 | // FPS skipping / limit | |
35 | BOOL bInitCap = TRUE; | |
36 | float fps_skip = 0; | |
37 | float fps_cur = 0; | |
38 | ||
39 | #define MAXLACE 16 | |
40 | ||
41 | void CheckFrameRate(void) | |
42 | { | |
43 | if(UseFrameSkip) // skipping mode? | |
44 | { | |
45 | if(!(dwActFixes&0x80)) // not old skipping mode? | |
46 | { | |
47 | dwLaceCnt++; // -> store cnt of vsync between frames | |
48 | if(dwLaceCnt>=MAXLACE && UseFrameLimit) // -> if there are many laces without screen toggling, | |
49 | { // do std frame limitation | |
50 | if(dwLaceCnt==MAXLACE) bInitCap=TRUE; | |
51 | FrameCap(); | |
52 | } | |
53 | } | |
54 | else if(UseFrameLimit) FrameCap(); | |
55 | calcfps(); // -> calc fps display in skipping mode | |
56 | } | |
57 | else // non-skipping mode: | |
58 | { | |
59 | if(UseFrameLimit) FrameCap(); // -> do it | |
60 | if(ulKeybits&KEY_SHOWFPS) calcfps(); // -> and calc fps display | |
61 | } | |
62 | } | |
63 | ||
64 | #define TIMEBASE 100000 | |
65 | ||
66 | unsigned long timeGetTime() | |
67 | { | |
68 | struct timeval tv; | |
69 | gettimeofday(&tv, 0); // well, maybe there are better ways | |
70 | return tv.tv_sec * 100000 + tv.tv_usec/10; // to do that, but at least it works | |
71 | } | |
72 | ||
73 | void FrameCap (void) | |
74 | { | |
75 | static unsigned long curticks, lastticks, _ticks_since_last_update; | |
76 | static unsigned int TicksToWait = 0; | |
77 | int overslept=0, tickstogo=0; | |
78 | BOOL Waiting = TRUE; | |
79 | ||
80 | { | |
81 | curticks = timeGetTime(); | |
82 | _ticks_since_last_update = curticks - lastticks; | |
83 | ||
84 | if((_ticks_since_last_update > TicksToWait) || | |
85 | (curticks <lastticks)) | |
86 | { | |
87 | lastticks = curticks; | |
88 | overslept = _ticks_since_last_update - TicksToWait; | |
89 | if((_ticks_since_last_update-TicksToWait) > dwFrameRateTicks) | |
90 | TicksToWait=0; | |
91 | else | |
92 | TicksToWait=dwFrameRateTicks - overslept; | |
93 | } | |
94 | else | |
95 | { | |
96 | while (Waiting) | |
97 | { | |
98 | curticks = timeGetTime(); | |
99 | _ticks_since_last_update = curticks - lastticks; | |
100 | tickstogo = TicksToWait - _ticks_since_last_update; | |
101 | if ((_ticks_since_last_update > TicksToWait) || | |
102 | (curticks < lastticks) || tickstogo < overslept) | |
103 | { | |
104 | Waiting = FALSE; | |
105 | lastticks = curticks; | |
106 | overslept = _ticks_since_last_update - TicksToWait; | |
107 | TicksToWait = dwFrameRateTicks - overslept; | |
108 | return; | |
109 | } | |
110 | if (tickstogo >= 200 && !(dwActFixes&16)) | |
111 | usleep(tickstogo*10 - 200); | |
112 | } | |
113 | } | |
114 | } | |
115 | } | |
116 | ||
117 | #define MAXSKIP 120 | |
118 | ||
119 | void FrameSkip(void) | |
120 | { | |
121 | static int iNumSkips=0,iAdditionalSkip=0; // number of additional frames to skip | |
122 | static DWORD dwLastLace=0; // helper var for frame limitation | |
123 | static DWORD curticks, lastticks, _ticks_since_last_update; | |
124 | int tickstogo=0; | |
125 | static int overslept=0; | |
126 | ||
127 | if(!dwLaceCnt) return; // important: if no updatelace happened, we ignore it completely | |
128 | ||
129 | if(iNumSkips) // we are in skipping mode? | |
130 | { | |
131 | dwLastLace+=dwLaceCnt; // -> calc frame limit helper (number of laces) | |
132 | bSkipNextFrame = TRUE; // -> we skip next frame | |
133 | iNumSkips--; // -> ok, one done | |
134 | } | |
135 | else // ok, no additional skipping has to be done... | |
136 | { // we check now, if some limitation is needed, or a new skipping has to get started | |
137 | DWORD dwWaitTime; | |
138 | ||
139 | if(bInitCap || bSkipNextFrame) // first time or we skipped before? | |
140 | { | |
141 | if(UseFrameLimit && !bInitCap) // frame limit wanted and not first time called? | |
142 | { | |
143 | DWORD dwT=_ticks_since_last_update; // -> that's the time of the last drawn frame | |
144 | dwLastLace+=dwLaceCnt; // -> and that's the number of updatelace since the start of the last drawn frame | |
145 | ||
146 | curticks = timeGetTime(); // -> now we calc the time of the last drawn frame + the time we spent skipping | |
147 | _ticks_since_last_update= dwT+curticks - lastticks; | |
148 | ||
149 | dwWaitTime=dwLastLace*dwFrameRateTicks; // -> and now we calc the time the real psx would have needed | |
150 | ||
151 | if(_ticks_since_last_update<dwWaitTime) // -> we were too fast? | |
152 | { | |
153 | if((dwWaitTime-_ticks_since_last_update)> // -> some more security, to prevent | |
154 | (60*dwFrameRateTicks)) // wrong waiting times | |
155 | _ticks_since_last_update=dwWaitTime; | |
156 | ||
157 | while(_ticks_since_last_update<dwWaitTime) // -> loop until we have reached the real psx time | |
158 | { // (that's the additional limitation, yup) | |
159 | curticks = timeGetTime(); | |
160 | _ticks_since_last_update = dwT+curticks - lastticks; | |
161 | } | |
162 | } | |
163 | else // we were still too slow ?!!? | |
164 | { | |
165 | if(iAdditionalSkip<MAXSKIP) // -> well, somewhen we really have to stop skipping on very slow systems | |
166 | { | |
167 | iAdditionalSkip++; // -> inc our watchdog var | |
168 | dwLaceCnt=0; // -> reset lace count | |
169 | lastticks = timeGetTime(); | |
170 | return; // -> done, we will skip next frame to get more speed | |
171 | } | |
172 | } | |
173 | } | |
174 | ||
175 | bInitCap=FALSE; // -> ok, we have inited the frameskip func | |
176 | iAdditionalSkip=0; // -> init additional skip | |
177 | bSkipNextFrame=FALSE; // -> we don't skip the next frame | |
178 | lastticks = timeGetTime(); // -> we store the start time of the next frame | |
179 | dwLaceCnt=0; // -> and we start to count the laces | |
180 | dwLastLace=0; | |
181 | _ticks_since_last_update=0; | |
182 | return; // -> done, the next frame will get drawn | |
183 | } | |
184 | ||
185 | bSkipNextFrame=FALSE; // init the frame skip signal to 'no skipping' first | |
186 | ||
187 | curticks = timeGetTime(); // get the current time (we are now at the end of one drawn frame) | |
188 | _ticks_since_last_update = curticks - lastticks; | |
189 | ||
190 | dwLastLace=dwLaceCnt; // store curr count (frame limitation helper) | |
191 | dwWaitTime=dwLaceCnt*dwFrameRateTicks; // calc the 'real psx lace time' | |
192 | if (dwWaitTime >= overslept) | |
193 | dwWaitTime-=overslept; | |
194 | ||
195 | if(_ticks_since_last_update>dwWaitTime) // hey, we needed way too long for that frame... | |
196 | { | |
197 | if(UseFrameLimit) // if limitation, we skip just next frame, | |
198 | { // and decide after, if we need to do more | |
199 | iNumSkips=0; | |
200 | } | |
201 | else | |
202 | { | |
203 | iNumSkips=_ticks_since_last_update/dwWaitTime; // -> calc number of frames to skip to catch up | |
204 | iNumSkips--; // -> since we already skip next frame, one down | |
205 | if(iNumSkips>MAXSKIP) iNumSkips=MAXSKIP; // -> well, somewhere we have to draw a line | |
206 | } | |
207 | bSkipNextFrame = TRUE; // -> signal for skipping the next frame | |
208 | } | |
209 | else // we were faster than real psx? fine :) | |
210 | if(UseFrameLimit) // frame limit used? so we wait til the 'real psx time' has been reached | |
211 | { | |
212 | if(dwLaceCnt>MAXLACE) // -> security check | |
213 | _ticks_since_last_update=dwWaitTime; | |
214 | ||
215 | while(_ticks_since_last_update<dwWaitTime) // -> just do a waiting loop... | |
216 | { | |
217 | curticks = timeGetTime(); | |
218 | _ticks_since_last_update = curticks - lastticks; | |
219 | ||
220 | tickstogo = dwWaitTime - _ticks_since_last_update; | |
221 | if (tickstogo-overslept >= 200 && !(dwActFixes&16)) | |
222 | usleep(tickstogo*10 - 200); | |
223 | } | |
224 | } | |
225 | overslept = _ticks_since_last_update - dwWaitTime; | |
226 | if (overslept < 0) | |
227 | overslept = 0; | |
228 | lastticks = timeGetTime(); // ok, start time of the next frame | |
229 | } | |
230 | ||
231 | dwLaceCnt=0; // init lace counter | |
232 | } | |
233 | ||
234 | void calcfps(void) | |
235 | { | |
236 | static unsigned long curticks,_ticks_since_last_update,lastticks; | |
237 | static long fps_cnt = 0; | |
238 | static unsigned long fps_tck = 1; | |
239 | static long fpsskip_cnt = 0; | |
240 | static unsigned long fpsskip_tck = 1; | |
241 | ||
242 | { | |
243 | curticks = timeGetTime(); | |
244 | _ticks_since_last_update=curticks-lastticks; | |
245 | ||
246 | if(UseFrameSkip && !UseFrameLimit && _ticks_since_last_update) | |
247 | fps_skip=min(fps_skip,((float)TIMEBASE/(float)_ticks_since_last_update+1.0f)); | |
248 | ||
249 | lastticks = curticks; | |
250 | } | |
251 | ||
252 | if(UseFrameSkip && UseFrameLimit) | |
253 | { | |
254 | fpsskip_tck += _ticks_since_last_update; | |
255 | ||
256 | if(++fpsskip_cnt==2) | |
257 | { | |
258 | fps_skip = (float)2000/(float)fpsskip_tck; | |
259 | fps_skip +=6.0f; | |
260 | fpsskip_cnt = 0; | |
261 | fpsskip_tck = 1; | |
262 | } | |
263 | } | |
264 | ||
265 | fps_tck += _ticks_since_last_update; | |
266 | ||
267 | if(++fps_cnt==20) | |
268 | { | |
269 | fps_cur = (float)(TIMEBASE*20)/(float)fps_tck; | |
270 | ||
271 | fps_cnt = 0; | |
272 | fps_tck = 1; | |
273 | ||
274 | //if(UseFrameLimit && fps_cur>fFrameRateHz) // optical adjust ;) avoids flickering fps display | |
275 | //fps_cur=fFrameRateHz; | |
276 | } | |
277 | ||
278 | } | |
279 | ||
280 | void PCFrameCap (void) | |
281 | { | |
282 | static unsigned long curticks, lastticks, _ticks_since_last_update; | |
283 | static unsigned long TicksToWait = 0; | |
284 | BOOL Waiting = TRUE; | |
285 | ||
286 | while (Waiting) | |
287 | { | |
288 | curticks = timeGetTime(); | |
289 | _ticks_since_last_update = curticks - lastticks; | |
290 | if ((_ticks_since_last_update > TicksToWait) || | |
291 | (curticks < lastticks)) | |
292 | { | |
293 | Waiting = FALSE; | |
294 | lastticks = curticks; | |
295 | TicksToWait = (TIMEBASE/ (unsigned long)fFrameRateHz); | |
296 | } | |
297 | } | |
298 | } | |
299 | ||
300 | void PCcalcfps(void) | |
301 | { | |
302 | static unsigned long curticks,_ticks_since_last_update,lastticks; | |
303 | static long fps_cnt = 0; | |
304 | static float fps_acc = 0; | |
305 | float CurrentFPS=0; | |
306 | ||
307 | curticks = timeGetTime(); | |
308 | _ticks_since_last_update=curticks-lastticks; | |
309 | if(_ticks_since_last_update) | |
310 | CurrentFPS=(float)TIMEBASE/(float)_ticks_since_last_update; | |
311 | else CurrentFPS = 0; | |
312 | lastticks = curticks; | |
313 | ||
314 | fps_acc += CurrentFPS; | |
315 | ||
316 | if(++fps_cnt==10) | |
317 | { | |
318 | fps_cur = fps_acc / 10; | |
319 | fps_acc = 0; | |
320 | fps_cnt = 0; | |
321 | } | |
322 | ||
323 | fps_skip=CurrentFPS+1.0f; | |
324 | } | |
325 | ||
326 | void SetAutoFrameCap(void) | |
327 | { | |
328 | if(iFrameLimit==1) | |
329 | { | |
330 | fFrameRateHz = fFrameRate; | |
331 | dwFrameRateTicks=(TIMEBASE*100 / (unsigned long)(fFrameRateHz*100)); | |
332 | return; | |
333 | } | |
334 | ||
335 | if(dwActFixes&32) | |
336 | { | |
337 | if (PSXDisplay.Interlaced) | |
338 | fFrameRateHz = PSXDisplay.PAL?50.0f:60.0f; | |
339 | else fFrameRateHz = PSXDisplay.PAL?25.0f:30.0f; | |
340 | } | |
341 | else | |
342 | { | |
343 | fFrameRateHz = PSXDisplay.PAL?50.0f:59.94f; | |
344 | dwFrameRateTicks=(TIMEBASE*100 / (unsigned long)(fFrameRateHz*100)); | |
345 | } | |
346 | } | |
347 | ||
348 | void SetFPSHandler(void) | |
349 | { | |
350 | } | |
351 | ||
352 | void InitFPS(void) | |
353 | { | |
354 | if(!fFrameRate) fFrameRate=200.0f; | |
355 | if(fFrameRateHz==0) fFrameRateHz=fFrameRate; // set user framerate | |
356 | dwFrameRateTicks=(TIMEBASE / (unsigned long)fFrameRateHz); | |
357 | } |