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annotate src/thread/dc/SDL_syssem.c @ 1295:c3e36ac8a94c

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Date: Sun, 6 Mar 2005 17:06:20 +0100 From: Per Inge Mathisen Subject: [SDL] Fullscreen refresh on win32 Windows has a terrible default for fullscreen 3D apps of 60mhz refresh rate. This can be fixed by the user by going into his driver's control panel and forcing the refresh rate higher. However, this not a very user friendly way about it, and in any case SDL contains no code that could figure out this that condition has afflicted the user. So the question is, could SDL fix this for the user? It is possible under Windows to request a higher refresh rate. The danger is of course that if the user has an old monitor, and you request a too high refresh rate, the monitor could be damaged. However, I believe there might be a way around that: Check before switching what refresh rate the user's desktop runs in, and if our fullscreen dimensions are equal or less than those of the desktop, use the higher refresh rate of 60 and the desktop rate. Since most users run their desktops in the same or higher resolution something sane, this should fix this problem for most users. Thoughts? An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE) option so that programs can bitch at their users at their own convenience. - Per
author Sam Lantinga <slouken@libsdl.org>
date Mon, 30 Jan 2006 06:56:10 +0000
parents b8d311d90021
children c9b51268668f
rev   line source
509
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
509
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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 BERO
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20 bero@geocities.co.jp
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21
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22 based on generic/SDL_syssem.c
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23
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24 Sam Lantinga
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25 slouken@libsdl.org
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26 */
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27
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28 #ifdef SAVE_RCSID
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29 static char rcsid =
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30 "@(#) $Id$";
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31 #endif
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32
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33 /* An implementation of semaphores using mutexes and condition variables */
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34
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35 #include <stdlib.h>
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36
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37 #include "SDL_error.h"
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38 #include "SDL_timer.h"
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39 #include "SDL_thread.h"
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40 #include "SDL_systhread_c.h"
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41
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42
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43 #ifdef DISABLE_THREADS
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44
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45 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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46 {
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47 SDL_SetError("SDL not configured with thread support");
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48 return (SDL_sem *)0;
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49 }
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50
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51 void SDL_DestroySemaphore(SDL_sem *sem)
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52 {
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53 return;
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54 }
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55
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56 int SDL_SemTryWait(SDL_sem *sem)
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57 {
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58 SDL_SetError("SDL not configured with thread support");
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59 return -1;
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60 }
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61
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62 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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63 {
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64 SDL_SetError("SDL not configured with thread support");
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65 return -1;
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66 }
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67
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68 int SDL_SemWait(SDL_sem *sem)
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69 {
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70 SDL_SetError("SDL not configured with thread support");
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71 return -1;
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72 }
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73
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74 Uint32 SDL_SemValue(SDL_sem *sem)
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75 {
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76 return 0;
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77 }
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78
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79 int SDL_SemPost(SDL_sem *sem)
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80 {
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81 SDL_SetError("SDL not configured with thread support");
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82 return -1;
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83 }
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84
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85 #else
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86
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87 #include <kos/sem.h>
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88
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89 struct SDL_semaphore
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90 {
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91 semaphore_t sem;
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92 };
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93
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94 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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95 {
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96 return (SDL_sem *)sem_create(initial_value);
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97 }
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98
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99 /* WARNING:
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100 You cannot call this function when another thread is using the semaphore.
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101 */
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102 void SDL_DestroySemaphore(SDL_sem *sem)
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103 {
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104 if ( ! sem ) {
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105 SDL_SetError("Passed a NULL semaphore");
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106 return;
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107 }
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108
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109 sem_destroy(&sem->sem);
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110 }
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111
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112 int SDL_SemTryWait(SDL_sem *sem)
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113 {
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114 int retval;
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115
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116 if ( ! sem ) {
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117 SDL_SetError("Passed a NULL semaphore");
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118 return -1;
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119 }
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120
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121 retval = sem_trywait(&sem->sem);
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122 if (retval==0) return 0;
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123 else return SDL_MUTEX_TIMEDOUT;
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124
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125 return retval;
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126 }
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127
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128 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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129 {
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130 int retval;
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131
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132 if ( ! sem ) {
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133 SDL_SetError("Passed a NULL semaphore");
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134 return -1;
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135 }
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136
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137 /* A timeout of 0 is an easy case */
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138 if ( timeout == 0 ) {
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139 return SDL_SemTryWait(sem);
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140 }
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141
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142 retval = sem_wait_timed(&sem->sem,timeout);
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143 if (retval==-1) retval= SDL_MUTEX_TIMEDOUT;
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144
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145 return retval;
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146 }
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147
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148 int SDL_SemWait(SDL_sem *sem)
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149 {
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150 if ( ! sem ) {
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151 SDL_SetError("Passed a NULL semaphore");
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152 return -1;
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153 }
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154
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155 sem_wait(&sem->sem);
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156 return 0;
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157 }
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158
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159 Uint32 SDL_SemValue(SDL_sem *sem)
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160 {
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161 if ( ! sem ) {
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162 SDL_SetError("Passed a NULL semaphore");
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163 return -1;
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164 }
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165
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166 return sem_count(&sem->sem);
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167 }
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168
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169 int SDL_SemPost(SDL_sem *sem)
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170 {
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171 if ( ! sem ) {
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172 SDL_SetError("Passed a NULL semaphore");
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173 return -1;
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174 }
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175
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176 sem_signal(&sem->sem);
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177 return 0;
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178 }
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179
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180 #endif /* DISABLE_THREADS */