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1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Library General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Library General Public |
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16 License along with this library; if not, write to the Free |
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@devolution.com |
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21 */ |
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22 |
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23 /* |
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24 SDL_systimer.cpp |
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25 |
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26 Epoc version by Hannu Viitala (hannu.j.viitala@mbnet.fi) |
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27 Markus Mertama |
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28 */ |
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29 |
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30 #include <e32std.h> |
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31 #include <e32hal.h> |
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32 |
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33 extern "C" { |
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34 #include "SDL_error.h" |
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35 #include "SDL_thread.h" |
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36 #include "SDL_timer.h" |
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37 #include "SDL_timer_c.h" |
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38 |
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39 static TUint start = 0; |
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40 static TInt tickPeriodMilliSeconds; |
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41 |
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42 |
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43 void SDL_StartTicks(void) |
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44 { |
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45 /* Set first ticks value */ |
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46 start = User::TickCount(); |
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47 |
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48 TTimeIntervalMicroSeconds32 period; |
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49 TInt tmp = UserHal::TickPeriod(period); |
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50 tickPeriodMilliSeconds = period.Int() / 1000; |
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51 } |
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52 |
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53 Uint32 SDL_GetTicks(void) |
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54 { |
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55 TUint deltaTics = User::TickCount() - start; |
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56 return(deltaTics * tickPeriodMilliSeconds); |
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57 } |
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58 |
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59 void SDL_Delay(Uint32 ms) |
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60 { |
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61 User::After(TTimeIntervalMicroSeconds32(ms*1000)); |
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62 } |
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63 |
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64 /* Data to handle a single periodic alarm */ |
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65 static int timer_alive = 0; |
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66 static SDL_Thread *timer = NULL; |
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67 |
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68 static int RunTimer(void *unused) |
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69 { |
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70 while ( timer_alive ) |
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71 { |
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72 if (SDL_timer_running) |
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73 { |
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74 SDL_ThreadedTimerCheck(); |
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75 } |
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76 SDL_Delay(10); |
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77 } |
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78 return(0); |
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79 } |
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80 |
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81 /* This is only called if the event thread is not running */ |
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82 int SDL_SYS_TimerInit(void) |
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83 { |
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84 if(timer != NULL) |
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85 return (-1); |
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86 timer_alive = 1; |
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87 timer = SDL_CreateThread(RunTimer, NULL); |
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88 if ( timer == NULL ) |
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89 return(-1); |
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90 return(SDL_SetTimerThreaded(1)); |
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91 } |
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92 |
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93 void SDL_SYS_TimerQuit(void) |
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94 { |
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95 timer_alive = 0; |
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96 if ( timer ) |
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97 { |
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98 SDL_WaitThread(timer, NULL); |
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99 timer = NULL; |
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100 } |
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101 } |
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102 |
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103 int SDL_SYS_StartTimer(void) |
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104 { |
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105 SDL_SetError("Internal logic error: Epoc uses threaded timer"); |
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106 return(-1); |
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107 } |
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108 |
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109 void SDL_SYS_StopTimer(void) |
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110 { |
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111 return; |
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112 } |
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113 |
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114 } // extern "C" |