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annotate src/timer/riscos/SDL_systimer.c @ 1554:0ca607a5d173

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Fixed bug #84 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:04:40 +0000
parents d910939febfa
children 92947e3a18db
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 #include <stdio.h>
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25 #include <time.h>
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26 #include <sys/time.h>
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27 #include <unistd.h>
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28 #include <string.h>
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29 #include <errno.h>
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30
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31 #include "SDL_timer.h"
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32 #include "../SDL_timer_c.h"
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33
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34 #if SDL_THREADS_DISABLED
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35 /* Timer SDL_arraysize(Timer ),start/reset time */
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36 static Uint32 timerStart;
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37 /* Timer running function */
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38 void RISCOS_CheckTimer();
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39 #else
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40 #include <pthread.h>
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41 extern Uint32 riscos_main_thread;
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42 extern int riscos_using_threads;
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43 extern Uint32 SDL_ThreadID();
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44 extern Uint32 SDL_EventThreadID(void);
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45 #endif
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46
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47
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48 extern void RISCOS_BackgroundTasks(void);
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49
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50 /* The first ticks value of the application */
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51 clock_t start;
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52
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53 void SDL_StartTicks(void)
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54 {
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55 /* Set first ticks value */
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56 start = clock();
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57 }
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58
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59 Uint32 SDL_GetTicks (void)
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60 {
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61 clock_t ticks;
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62
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63 ticks=clock()-start;
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64
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65
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66 #if CLOCKS_PER_SEC == 1000
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67
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68 return(ticks);
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69
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70 #elif CLOCKS_PER_SEC == 100
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71
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72 return (ticks * 10);
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73
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74 #else
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75
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76 return ticks*(1000/CLOCKS_PER_SEC);
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77
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78 #endif
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79
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80 }
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81
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82 void SDL_Delay (Uint32 ms)
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83 {
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84 Uint32 now,then,elapsed;
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85 #if !SDL_THREADS_DISABLED
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86 int is_event_thread;
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87 if (riscos_using_threads)
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88 {
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89 is_event_thread = 0;
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90 if (SDL_EventThreadID())
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91 {
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92 if (SDL_EventThreadID() == SDL_ThreadID()) is_event_thread = 1;
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93 } else if (SDL_ThreadID() == riscos_main_thread) is_event_thread = 1;
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94 } else is_event_thread = 1;
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95 #endif
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96
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97 /*TODO: Next version of Unixlib may allow us to use usleep here */
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98 /* for non event threads */
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99
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100 /* Set the timeout interval - Linux only needs to do this once */
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101 then = SDL_GetTicks();
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102
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103 do {
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104 /* Do background tasks required while sleeping as we are not multithreaded */
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105 #if SDL_THREADS_DISABLED
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106 RISCOS_BackgroundTasks();
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107 #else
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108 /* For threaded build only run background tasks in event thread */
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109 if (is_event_thread) RISCOS_BackgroundTasks();
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110 #endif
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111
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112 /* Calculate the time interval left (in case of interrupt) */
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113 now = SDL_GetTicks();
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114 elapsed = (now-then);
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115 then = now;
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116 if ( elapsed >= ms ) {
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117 break;
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118 }
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119 ms -= elapsed;
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120 #if !SDL_THREADS_DISABLED
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121 /* Need to yield to let other threads have a go */
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122 if (riscos_using_threads) pthread_yield();
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123 #endif
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124
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125 } while ( 1 );
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126 }
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127
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128 #if SDL_THREADS_DISABLED
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129
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130 /* Non-threaded version of timer */
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131
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132 int SDL_SYS_TimerInit(void)
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133 {
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134 return(0);
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135 }
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136
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137 void SDL_SYS_TimerQuit(void)
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138 {
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139 SDL_SetTimer(0, NULL);
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140 }
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141
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142 int SDL_SYS_StartTimer(void)
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143 {
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144 timerStart = SDL_GetTicks();
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145
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146 return(0);
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147 }
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148
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149 void SDL_SYS_StopTimer(void)
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150 {
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151 /* Don't need to do anything as we use SDL_timer_running
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152 to detect if we need to check the timer */
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153 }
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154
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155
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156 void RISCOS_CheckTimer()
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157 {
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158 if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval)
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159 {
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160 Uint32 ms;
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161
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162 ms = SDL_alarm_callback(SDL_alarm_interval);
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163 if ( ms != SDL_alarm_interval )
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164 {
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165 if ( ms )
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166 {
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167 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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168 } else
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169 {
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170 SDL_alarm_interval = 0;
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171 SDL_timer_running = 0;
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172 }
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173 }
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174 if (SDL_alarm_interval) timerStart = SDL_GetTicks();
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175 }
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176 }
955
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177
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178 #else
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179
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180 /* Threaded version of timer - based on code for linux */
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181
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182 #include "SDL_thread.h"
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183
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184 /* Data to handle a single periodic alarm */
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185 static int timer_alive = 0;
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186 static SDL_Thread *timer = NULL;
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187
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188 static int RunTimer(void *unused)
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189 {
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190 while ( timer_alive ) {
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191 if ( SDL_timer_running ) {
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192 SDL_ThreadedTimerCheck();
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193 }
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194 SDL_Delay(1);
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195 }
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196 return(0);
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197 }
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198
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199 /* This is only called if the event thread is not running */
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200 int SDL_SYS_TimerInit(void)
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201 {
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202 timer_alive = 1;
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203 timer = SDL_CreateThread(RunTimer, NULL);
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204 if ( timer == NULL )
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205 return(-1);
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206 return(SDL_SetTimerThreaded(1));
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207 }
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208
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209 void SDL_SYS_TimerQuit(void)
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210 {
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211 timer_alive = 0;
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212 if ( timer ) {
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213 SDL_WaitThread(timer, NULL);
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214 timer = NULL;
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215 }
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216 }
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217
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218 int SDL_SYS_StartTimer(void)
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219 {
1035
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220 SDL_SetError("Internal logic error: RISC OS uses threaded timer");
955
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221 return(-1);
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222 }
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223
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224 void SDL_SYS_StopTimer(void)
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225 {
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226 return;
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227 }
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228
1361
19418e4422cb New configure-based build system. Still work in progress, but much improved
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229 #endif /* SDL_THREADS_DISABLED */