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comparison src/timer/riscos/SDL_systimer.c @ 630:550bccdf04bd

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Added initial support for RISC OS (thanks Peter Naulls!)
author Sam Lantinga <slouken@libsdl.org>
date Thu, 29 May 2003 04:44:13 +0000
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children b8d311d90021
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629:3fa401bb4bb5 630:550bccdf04bd
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id$";
26 #endif
27
28 #include <stdio.h>
29 #include <time.h>
30 #include <sys/time.h>
31 #include <unistd.h>
32 #include <string.h>
33 #include <errno.h>
34
35 #include "SDL_error.h"
36 #include "SDL_timer.h"
37 #include "SDL_timer_c.h"
38
39 /* Timer start/reset time */
40 static Uint32 timerStart;
41 /* Timer running function */
42 void RISCOS_CheckTimer();
43
44 extern void RISCOS_BackgroundTasks(void);
45
46 /* The first ticks value of the application */
47 clock_t start;
48
49 void SDL_StartTicks(void)
50 {
51 /* Set first ticks value */
52 start = clock();
53 }
54
55 Uint32 SDL_GetTicks (void)
56 {
57 clock_t ticks;
58
59 ticks=clock()-start;
60
61
62 #if CLOCKS_PER_SEC == 1000
63
64 return(ticks);
65
66 #elif CLOCKS_PER_SEC == 100
67
68 return (ticks * 10);
69
70 #else
71
72 return ticks*(1000/CLOCKS_PER_SEC);
73
74 #endif
75
76 }
77
78 extern void DRenderer_FillBuffers();
79
80 void SDL_Delay (Uint32 ms)
81 {
82 Uint32 now,then,elapsed;
83
84 /* Set the timeout interval - Linux only needs to do this once */
85 then = SDL_GetTicks();
86
87 do {
88 /* Do background tasks required while sleeping as we are not multithreaded */
89 RISCOS_BackgroundTasks();
90 /* Calculate the time interval left (in case of interrupt) */
91 now = SDL_GetTicks();
92 elapsed = (now-then);
93 then = now;
94 if ( elapsed >= ms ) {
95 break;
96 }
97 ms -= elapsed;
98
99 } while ( 1 );
100 }
101
102 int SDL_SYS_TimerInit(void)
103 {
104 return(0);
105 }
106
107 void SDL_SYS_TimerQuit(void)
108 {
109 SDL_SetTimer(0, NULL);
110 }
111
112 int SDL_SYS_StartTimer(void)
113 {
114 timerStart = SDL_GetTicks();
115
116 return(0);
117 }
118
119 void SDL_SYS_StopTimer(void)
120 {
121 /* Don't need to do anything as we use SDL_timer_running
122 to detect if we need to check the timer */
123 }
124
125
126 void RISCOS_CheckTimer()
127 {
128 if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval)
129 {
130 Uint32 ms;
131
132 ms = SDL_alarm_callback(SDL_alarm_interval);
133 if ( ms != SDL_alarm_interval )
134 {
135 if ( ms )
136 {
137 SDL_alarm_interval = ROUND_RESOLUTION(ms);
138 } else
139 {
140 SDL_alarm_interval = 0;
141 SDL_timer_running = 0;
142 }
143 }
144 if (SDL_alarm_interval) timerStart = SDL_GetTicks();
145 }
146 }