98e75f2d |
1 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |
2 | * Copyright (C) 2011 yongzh (freeman.yong@gmail.com) * |
3 | * * |
4 | * This program is free software; you can redistribute it and/or modify * |
5 | * it under the terms of the GNU General Public License as published by * |
6 | * the Free Software Foundation; either version 2 of the License, or * |
7 | * (at your option) any later version. * |
8 | * * |
9 | * This program is distributed in the hope that it will be useful, * |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
12 | * GNU General Public License for more details. * |
13 | * * |
14 | * You should have received a copy of the GNU General Public License * |
15 | * along with this program; if not, write to the * |
16 | * Free Software Foundation, Inc., * |
17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * |
18 | * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
19 | |
20 | #include "FrameSkipper.h" |
21 | #include "ticks.h" |
22 | #include <stdio.h> |
23 | |
24 | FrameSkipper::FrameSkipper() |
25 | : skipType(AUTO), maxSkips(2), targetFPS(60) |
26 | { |
27 | } |
28 | |
29 | void FrameSkipper::start() |
30 | { |
31 | initialTicks = 0; |
32 | virtualCount = 0; |
33 | skipCounter = 0; |
34 | oldSkip = 0; |
35 | } |
36 | #if 0 |
37 | bool FrameSkipper::hasSkipped() |
38 | { |
39 | oldSkip = skipCounter; |
40 | |
41 | if (skipType == MANUAL) { |
42 | if (++skipCounter > maxSkips) |
43 | skipCounter = 0; |
44 | //printf("frameskipper(Manual): oldSkip=%i, skipCounter=%i, countVI=%i\n", oldSkip, skipCounter, countVI); |
45 | countVI = 0; |
46 | return (oldSkip>0); |
47 | } |
48 | |
49 | unsigned int elapsed = ticksGetTicks()/* - initialTicks*/; |
50 | int realCount = (elapsed-initialTicks - 4) * targetFPS; // 4ms tolerance |
51 | if ((realCount > countVI*1000) && (skipCounter < maxSkips) && (countVI<10)) { |
52 | skipCounter++; |
53 | //printf("Skip frame elapsed=%u realCount=%u countVI=%u skipCounter=%i\n", elapsed-initialTicks, realCount, countVI, skipCounter); |
54 | } else { |
55 | //printf(" Ok frame elapsed=%u realCount=%u countVI=%u skipCounter=%i\n", elapsed-initialTicks, realCount, countVI, skipCounter); |
56 | skipCounter = 0; |
57 | initialTicks=elapsed; |
58 | virtualCount=0; |
59 | countVI=0; |
60 | } |
61 | //printf("frameskipper(Auto): oldSkip=%i, skipCounter=%i, countVI=%i, realCount=%u\n", oldSkip, skipCounter, countVI, realCount); |
62 | return (oldSkip>0); |
63 | } |
64 | #else |
65 | void FrameSkipper::newFrame() |
66 | { |
67 | oldSkip = skipCounter; |
68 | |
69 | if (skipType == MANUAL) { |
70 | if (++skipCounter > maxSkips) |
71 | skipCounter = 0; |
72 | //printf("frameskipper(Manual): oldSkip=%i, skipCounter=%i, countVI=%i\n", oldSkip, skipCounter, countVI); |
73 | countVI = 0; |
74 | return; |
75 | } |
76 | |
77 | unsigned int elapsed = ticksGetTicks()/* - initialTicks*/; |
78 | int realCount = (elapsed-initialTicks - 4) * targetFPS; // 4ms tolerance |
79 | if ((realCount > countVI*1000) && (skipCounter < maxSkips) && (countVI<10)) { |
80 | skipCounter++; |
81 | //printf("Skip frame elapsed=%u realCount=%u countVI=%u skipCounter=%i\n", elapsed-initialTicks, realCount, countVI, skipCounter); |
82 | } else { |
83 | //printf(" Ok frame elapsed=%u realCount=%u countVI=%u skipCounter=%i\n", elapsed-initialTicks, realCount, countVI, skipCounter); |
84 | skipCounter = 0; |
85 | initialTicks=elapsed; |
86 | virtualCount=0; |
87 | countVI=0; |
88 | } |
89 | //printf("frameskipper(Auto): oldSkip=%i, skipCounter=%i, countVI=%i, realCount=%u\n", oldSkip, skipCounter, countVI, realCount); |
90 | return; |
91 | } |
92 | #endif |
93 | |
94 | void FrameSkipper::update() |
95 | { |
96 | #if 1 |
97 | if (initialTicks == 0) { |
98 | initialTicks = ticksGetTicks(); |
99 | } |
100 | countVI++; |
101 | |
102 | if (countVI>20) { |
103 | skipCounter=0; // failsafe... |
104 | } |
105 | #else |
106 | // for the first frame |
107 | if (initialTicks == 0) { |
108 | initialTicks = ticksGetTicks(); |
109 | return; |
110 | } |
111 | |
112 | oldSkip=skipCounter; |
113 | |
114 | if (skipType == MANUAL) { |
115 | if (++skipCounter > maxSkips) |
116 | skipCounter = 0; |
117 | return; |
118 | } |
119 | |
120 | unsigned int elapsed = ticksGetTicks()/* - initialTicks*/; |
121 | unsigned int realCount = (elapsed-initialTicks) * targetFPS; |
122 | |
123 | virtualCount+=1000; |
124 | // if (realCount >= virtualCount) { |
125 | if (realCount > virtualCount+100 && |
126 | /*skipType == AUTO &&*/ skipCounter < maxSkips) { |
127 | skipCounter++; |
128 | //printf("Skip frame elapsed=%u initialTicks=%u realCount=%u virtualCound=%u skipCounter=%i\n", elapsed, initialTicks, realCount, virtualCount, skipCounter); |
129 | } else { |
130 | // virtualCount = realCount; |
131 | // if (skipType == AUTO) |
132 | skipCounter = 0; |
133 | initialTicks=elapsed; |
134 | virtualCount=0; |
135 | } |
136 | /* } else { |
137 | skipCounter = 0; |
138 | initialTicks=elapsed; |
139 | virtualCount=0; |
140 | }*/ |
141 | #endif |
142 | } |