1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2012 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@devolution.com
21 */
22
23 /*
24 SDL_systimer.cpp
25
26 Epoc version by Hannu Viitala (hannu.j.viitala@mbnet.fi)
27 Markus Mertama
28 */
29
30 #include <e32std.h>
31 #include <e32hal.h>
32
33 extern "C" {
34 #include "SDL_error.h"
35 #include "SDL_thread.h"
36 #include "SDL_timer.h"
37 #include "SDL_timer_c.h"
38
39 static TUint start = 0;
40 static TInt tickPeriodMilliSeconds;
41
42
SDL_StartTicks(void)43 void SDL_StartTicks(void)
44 {
45 /* Set first ticks value */
46 start = User::TickCount();
47
48 TTimeIntervalMicroSeconds32 period;
49 TInt tmp = UserHal::TickPeriod(period);
50 tickPeriodMilliSeconds = period.Int() / 1000;
51 }
52
SDL_GetTicks(void)53 Uint32 SDL_GetTicks(void)
54 {
55 TUint deltaTics = User::TickCount() - start;
56 return(deltaTics * tickPeriodMilliSeconds);
57 }
58
SDL_Delay(Uint32 ms)59 void SDL_Delay(Uint32 ms)
60 {
61 User::After(TTimeIntervalMicroSeconds32(ms*1000));
62 }
63
64 /* Data to handle a single periodic alarm */
65 static int timer_alive = 0;
66 static SDL_Thread *timer = NULL;
67
RunTimer(void * unused)68 static int RunTimer(void *unused)
69 {
70 while ( timer_alive )
71 {
72 if (SDL_timer_running)
73 {
74 SDL_ThreadedTimerCheck();
75 }
76 SDL_Delay(10);
77 }
78 return(0);
79 }
80
81 /* This is only called if the event thread is not running */
SDL_SYS_TimerInit(void)82 int SDL_SYS_TimerInit(void)
83 {
84 if(timer != NULL)
85 return (-1);
86 timer_alive = 1;
87 timer = SDL_CreateThread(RunTimer, NULL);
88 if ( timer == NULL )
89 return(-1);
90 return(SDL_SetTimerThreaded(1));
91 }
92
SDL_SYS_TimerQuit(void)93 void SDL_SYS_TimerQuit(void)
94 {
95 timer_alive = 0;
96 if ( timer )
97 {
98 SDL_WaitThread(timer, NULL);
99 timer = NULL;
100 }
101 }
102
SDL_SYS_StartTimer(void)103 int SDL_SYS_StartTimer(void)
104 {
105 SDL_SetError("Internal logic error: Epoc uses threaded timer");
106 return(-1);
107 }
108
SDL_SYS_StopTimer(void)109 void SDL_SYS_StopTimer(void)
110 {
111 return;
112 }
113
114 } // extern "C"
115