Mercurial > sdl-ios-xcode

annotate src/timer/mint/SDL_systimer.c @ 4928:930614179450 SDL-1.2

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Patch from Haiku's Google Code-In student Daniel Marth, fixes an off-by-one issue in bwindow.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 03 Dec 2010 16:55:25 -0800
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifdef SDL_TIMER_MINT
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25
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26 /*
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27 * TOS/MiNT timer driver
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28 * based on vbl vector
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29 *
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30 * Patrice Mandin
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31 */
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32
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33 #include <stdio.h>
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34 #include <sys/time.h>
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35 #include <signal.h>
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36 #include <unistd.h>
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37 #include <string.h>
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38 #include <errno.h>
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39
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40 #include <mint/cookie.h>
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41 #include <mint/sysvars.h>
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42 #include <mint/osbind.h>
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43 #include <mint/mintbind.h>
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44
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45 #include "SDL_timer.h"
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46 #include "../SDL_timer_c.h"
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47 #include "SDL_thread.h"
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48
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49 #include "SDL_vbltimer_s.h"
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50
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51 /* from audio/mint */
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52 void SDL_MintAudio_CheckFpu(void);
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53
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54 /* The first ticks value of the application */
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55 static Uint32 start;
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56 static SDL_bool read_hz200_from_vbl = SDL_FALSE;
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57 static int mint_present; /* can we use Syield() ? */
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58
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59 void SDL_StartTicks(void)
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60 {
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61 void *old_stack;
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62 unsigned long dummy;
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63
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64 /* Set first ticks value */
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65 old_stack = (void *)Super(0);
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66 start = *((volatile long *)_hz_200);
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67 Super(old_stack);
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68
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69 start *= 5; /* One _hz_200 tic is 5ms */
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70
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71 mint_present = (Getcookie(C_MiNT, &dummy) == C_FOUND);
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72 }
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73
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74 Uint32 SDL_GetTicks (void)
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75 {
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76 Uint32 now = start;
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77
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78 if (read_hz200_from_vbl) {
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79 now = SDL_Atari_hz200;
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80 } else {
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81 void *old_stack = (void *)Super(0);
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82 now = *((volatile long *)_hz_200);
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83 Super(old_stack);
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84 }
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85
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86 return((now*5)-start);
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87 }
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88
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89 void SDL_Delay (Uint32 ms)
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90 {
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91 Uint32 now;
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92
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93 now = SDL_GetTicks();
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94 while ((SDL_GetTicks()-now)<ms){
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95 if (mint_present) {
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96 Syield();
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97 }
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98 }
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99 }
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100
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101 /* Data to handle a single periodic alarm */
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102 static SDL_bool timer_installed=SDL_FALSE;
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103
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104 /* This is only called if the event thread is not running */
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105 int SDL_SYS_TimerInit(void)
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106 {
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107 void *old_stack;
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108
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109 SDL_MintAudio_CheckFpu();
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110
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111 /* Install RunTimer in vbl vector */
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112 old_stack = (void *)Super(0);
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113 timer_installed = !SDL_AtariVblInstall(SDL_ThreadedTimerCheck);
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114 Super(old_stack);
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115
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116 if (!timer_installed) {
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117 return(-1);
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118 }
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119
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120 read_hz200_from_vbl = SDL_TRUE;
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121 return(SDL_SetTimerThreaded(0));
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122 }
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123
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124 void SDL_SYS_TimerQuit(void)
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125 {
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126 /* Uninstall RunTimer vbl vector */
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127 if (timer_installed) {
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128 void *old_stack = (void *)Super(0);
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129 SDL_AtariVblUninstall(SDL_ThreadedTimerCheck);
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130 Super(old_stack);
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131 timer_installed = SDL_FALSE;
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132 }
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133 read_hz200_from_vbl = SDL_FALSE;
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134 }
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135
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136 int SDL_SYS_StartTimer(void)
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137 {
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138 SDL_SetError("Internal logic error: MiNT uses vbl timer");
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139 return(-1);
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140 }
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141
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142 void SDL_SYS_StopTimer(void)
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143 {
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144 return;
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145 }
1635
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146
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147 #endif /* SDL_TIMER_MINT */