| 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 | } |