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annotate src/timer/mint/SDL_systimer.c @ 4347:38f22ed3a433 SDL-1.2

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Option to fix bug #851 For some people setting the period size works better (and is what SDL 1.2.13 did), but for most people it's the same or worse. You can use an environment variable to pick which one you want.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 17 Oct 2009 06:55:17 +0000
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 */