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annotate src/timer/amigaos/SDL_systimer.c @ 21:75a95f82bc1f

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Updated the Amiga OS port of SDL (thanks Gabriele)
author Sam Lantinga <slouken@lokigames.com>
date Thu, 10 May 2001 20:13:29 +0000
parents 74212992fb08
children e8157fcb3114
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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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdio.h>
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29 #include <time.h>
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30 #include <signal.h>
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31 #include <unistd.h>
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32 #include <string.h>
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33 #include <errno.h>
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34 #include <exec/types.h>
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35 #ifdef __SASC
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36 #include <proto/dos.h>
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37 #include <clib/graphics_protos.h>
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38 #include <pragmas/graphics.h>
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39 #include <clib/exec_protos.h>
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40 #include <pragmas/exec.h>
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41 #else
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42 #include <inline/dos.h>
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43 #include <inline/exec.h>
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44 #include <inline/graphics.h>
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45 #endif
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46 #include "mydebug.h"
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47
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48 extern struct DosLibrary *DOSBase;
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49 extern struct ExecBase *SysBase;
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50 static struct GfxBase *GfxBase;
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51
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52 #include "SDL_error.h"
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53 #include "SDL_timer.h"
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54 #include "SDL_timer_c.h"
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55
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56 #if defined(DISABLE_THREADS) || defined(FORK_HACK)
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57 #define USE_ITIMER
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58 #endif
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59
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60 /* The first ticks value of the application */
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61
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62 #ifndef __PPC__
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63 static clock_t start;
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64
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65 void SDL_StartTicks(void)
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66 {
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67 /* Set first ticks value */
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68 start=clock();
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69 }
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70
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71 Uint32 SDL_GetTicks (void)
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72 {
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73 clock_t ticks;
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74
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75 ticks=clock()-start;
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76
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77 #ifdef __SASC
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78 // CLOCKS_PER_SEC == 1000 !
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79
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80 return(ticks);
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81 #else
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82 // CLOCKS_PER_SEC != 1000 !
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83
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84 return ticks*(1000/CLOCKS_PER_SEC);
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85 #endif
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86 }
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87
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88 void SDL_Delay (Uint32 ms)
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89 {
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90 // Do a busy wait if time is less than 50ms
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91
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92 if(ms<50)
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93 {
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94 clock_t to_wait=clock();
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95
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96 #ifndef __SASC
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97 ms*=(CLOCKS_PER_SEC/1000);
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98 #endif
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99 to_wait+=ms;
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100
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101 while(clock()<to_wait);
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102 }
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103 else
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104 {
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105 Delay(ms/20);
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106 }
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107 }
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108
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109 #else
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110
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111 ULONG MY_CLOCKS_PER_SEC;
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112
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113 void PPC_TimerInit(void);
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114 APTR MyTimer;
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115
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116 ULONG start[2];
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117
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118 void SDL_StartTicks(void)
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119 {
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120 /* Set first ticks value */
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121 if(!MyTimer)
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122 PPC_TimerInit();
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123
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124 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,start);
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125 start[1]>>=10;
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126 start[1]|=((result[0]&0x3ff)<<22);
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127 start[0]>>=10;
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128 }
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129
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130 Uint32 SDL_GetTicks (void)
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131 {
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132 ULONG result[2];
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133 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,result);
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134
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135 // PPCAsr64p(result,10);
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136 // Non va, la emulo:
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137
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138 result[1]>>=10;
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139 result[1]|=((result[0]&0x3ff)<<22);
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140
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141 // Non mi interessa piu' result[0]
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142
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143 return result[1]*1000/MY_CLOCKS_PER_SEC;
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144 }
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145
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146 void SDL_Delay (Uint32 ms)
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147 {
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148 // Do a busy wait if time is less than 50ms
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149
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150 if(ms<50)
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151 {
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152 ULONG to_wait[2],actual[2];
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153 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,result);
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154 actual[1]=0;
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155 to_wait[1]+=ms*1000/MY_CLOCKS_PER_SEC;
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156
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157 while(actual[1]<to_wait[1])
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158 {
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159 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,actual);
0
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160 }
21
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161 }
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162 else
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163 {
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164 Delay(ms/50);
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165 }
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166 }
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167
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168 void PPC_TimerInit(void)
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169 {
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170 struct TagItem tags[]=
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171 {
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172 PPCTIMERTAG_CPU,TRUE,
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173 TAG_DONE,0
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174 };
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175
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176
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177 if(MyTimer=PPCCreateTimerObject(tags))
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178 {
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179 ULONG result[2];
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180
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181 PPCGetTimerObject(MyTimer,PPCTIMERTAG_TICKSPERSEC,result);
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182 D(bug("Timer inizializzato, TPS: %lu - %lu\n",result[0],result[1]));
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183 // PPCAsr64p(result,10);
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184 result[1]>>=10;
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185 result[1]|=((result[0]&0x3ff)<<22);
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186 result[0]>>=10;
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187
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188 D(bug("Shiftato TPS: %lu - %lu\n",result[0],result[1]));
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189 MY_CLOCKS_PER_SEC=result[1];
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190
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191 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,result);
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192
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193 D(bug("Current ticks: %lu - %lu\n",result[0],result[1]));
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194 result[1]>>=10;
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195 result[1]|=((result[0]&0x3ff)<<22);
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196 result[0]>>=10;
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197 // PPCAsr64p(result,10);
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198 D(bug("Shiftato: %lu - %lu\n",result[0],result[1]));
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199 }
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200 else
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201 {
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202 D(bug("Errore nell'inizializzazione del timer!\n"));
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203 }
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204 }
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205
0
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206 #endif
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207
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208 #include "SDL_thread.h"
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209
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210 /* Data to handle a single periodic alarm */
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211 static int timer_alive = 0;
21
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212 static SDL_Thread *timer_thread = NULL;
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213
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214 static int RunTimer(void *unused)
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215 {
21
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216 D(bug("SYSTimer: Entering RunTimer loop..."));
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217
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218 if(GfxBase==NULL)
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219 GfxBase=(struct GfxBase *)OpenLibrary("graphics.library",37);
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220
0
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221 while ( timer_alive ) {
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222 if ( SDL_timer_running ) {
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223 SDL_ThreadedTimerCheck();
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224 }
21
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225 if(GfxBase)
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226 WaitTOF(); // Check the timer every fifth of seconds. Was SDL_Delay(1)->BusyWait!
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227 else
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228 Delay(1);
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229 }
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230 D(bug("SYSTimer: EXITING RunTimer loop..."));
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231 return(0);
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232 }
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233
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234 /* This is only called if the event thread is not running */
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235 int SDL_SYS_TimerInit(void)
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236 {
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237 D(bug("Creo il thread per il timer (NOITMER)...\n"));
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238
0
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239 timer_alive = 1;
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240 timer_thread = SDL_CreateThread(RunTimer, NULL);
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241 if ( timer_thread == NULL )
0
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242 {
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243 D(bug("Creazione del thread fallita...\n"));
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244
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245 return(-1);
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246 }
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247 return(SDL_SetTimerThreaded(1));
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248 }
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249
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250 void SDL_SYS_TimerQuit(void)
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251 {
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252 timer_alive = 0;
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253 if ( timer_thread ) {
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254 SDL_WaitThread(timer_thread, NULL);
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255 timer_thread = NULL;
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256 }
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257 }
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258
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259 int SDL_SYS_StartTimer(void)
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260 {
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261 SDL_SetError("Internal logic error: AmigaOS uses threaded timer");
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262 return(-1);
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263 }
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264
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265 void SDL_SYS_StopTimer(void)
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266 {
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267 return;
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268 }