annotate README.OS2 @ 4223:63fd67e17705 SDL-1.2

Fixed bug #727 Lorenzo Desole 2009-04-19 07:36:10 PDT I am one of the developers of a multimedia application (My Media System MMS), which uses SDL. MMS is normally running in fullscreen mode but it switches it off before launching external applications (mplayer, xine, etc.). The problem with fullscreen is that when the latter is switched off either via SDL_WM_ToggleFullScreen() or SDL_SetVideoMode(), SDL compares the current screen sizes with the ones saved when the video system was initted, and if they don't match, it calls XF86VidModeSwitchToMode() to switch to the old modeline. This makes it impossible for external programs and for MMS itself to use RandR to change the screen size, because next time fullscreen mode is turned off, it bombs out with the following error: X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 136 (XFree86-VidModeExtension) Minor opcode of failed request: 10 (XF86VidModeSwitchToMode) [...] Obviously this happens only if the new screen resolution is smaller than the original one and XF86VidModeSwitchToMode() can't succeed. I couldn't find any way to inform SDL that the screen resolution it uses as reference is no longer valid. This can be fixed by adding "save_mode(this)" to ./src/video/x11/SDL_x11modes.c, API X11_EnterFullScreen(_THIS), like this: int X11_EnterFullScreen(_THIS) { int okay; + save_mode(this); I can't rule out possible side effects, but I don't see any. While I admit this is a minor issue for the general users, it is a major showstopper for our program where the ability to change screen resolution and refresh rate according to the movie being played, is very important. Thanks in advance.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 21 Sep 2009 11:14:36 +0000
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2 ===========
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3 SDL on OS/2
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4 ===========
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6 Last updated on May. 17, 2006.
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9 1. How to compile?
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10 ------------------
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11
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12 To compile this, you'll need the followings installed:
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13 - The OS/2 Developer's Toolkit
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14 - The OpenWatcom compiler
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15 (http://www.openwatcom.org)
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17 First of all, you have to unzip the Watcom-OS2.zip file. This will result in a
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18 file called "makefile" and a file called "setvars.cmd" in this folder (and some
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19 more files...).
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21 Please edit the second, fourth and fifth lines of setvars.cmd file
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22 to set the folders where the toolkit, the OW compiler and the FSLib are.
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23 You won't need NASM yet (The Netwide Assembler), you can leave that line.
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24 Run setvars.cmd, and you should get a shell in which you can
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25 compile SDL.
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27 Check the "makefile" file. There is a line in there which determines if the
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28 resulting SDL.DLL will be a 'debug' or a 'release' build. The 'debug' version
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29 is full of printf()'s, so if something goes wrong, its output can help a lot
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30 for debugging.
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32 Then run "wmake".
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33 This should create the SDL12.DLL and the corresponding SDL12.LIB file here.
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35 To test applications, it's a good idea to use the 'debug' build of SDL, and
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36 redirect the standard output and standard error output to files, to see what
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37 happens internally in SDL.
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38 (like: testsprite >stdout.txt 2>stderr.txt)
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40 To rebuild SDL, use the following commands in this folder:
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41 wmake clean
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42 wmake
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46 2. How to compile the testapps?
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47 -------------------------------
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48
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49 Once you have SDL12.DLL compiled, navigate into the 'test' folder, copy in
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50 there the newly built SDL12.DLL, and copy in there FSLib.DLL.
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52 Then run "wmake" in there to compile some of the testapps.
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55
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56 3. What is missing?
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57 -------------------
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58
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59 The following things are missing from this SDL implementation:
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60 - MMX, SSE and 3DNOW! optimized video blitters?
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61 - HW Video surfaces
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62 - OpenGL support
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63
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66 4. Special Keys / Full-Screen support
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67 -------------------------------------
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68
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69 There are two special hot-keys implemented:
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70 - Alt+Home switches between fullscreen and windowed mode
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71 - Alt+End simulates closing the window (can be used as a Panic key)
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72 Only the LEFT Alt key will work.
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73
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76 5. Joysticks on SDL/2
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77 ---------------------
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78
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79 The Joystick detection only works for standard joysticks (2 buttons, 2 axes
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80 and the like). Therefore, if you use a non-standard joystick, you should
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81 specify its features in the SDL_OS2_JOYSTICK environment variable in a batch
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82 file or CONFIG.SYS, so SDL applications can provide full capability to your
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83 device. The syntax is:
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84
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85 SET SDL_OS2_JOYSTICK=[JOYSTICK_NAME] [AXES] [BUTTONS] [HATS] [BALLS]
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86
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87 So, it you have a Gravis GamePad with 4 axes, 2 buttons, 2 hats and 0 balls,
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88 the line should be:
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89
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90 SET SDL_OS2_JOYSTICK=Gravis_GamePad 4 2 2 0
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91
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92 If you want to add spaces in your joystick name, just surround it with
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93 quotes or double-quotes:
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94
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95 SET SDL_OS2_JOYSTICK='Gravis GamePad' 4 2 2 0
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96
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97 or
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98
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99 SET SDL_OS2_JOYSTICK="Gravis GamePad" 4 2 2 0
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100
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101 Notive However that Balls and Hats are not supported under OS/2, and the
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102 value will be ignored... but it is wise to define these correctly because
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103 in the future those can be supported.
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104 Also the number of buttons is limited to 2 when using two joysticks,
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105 4 when using one joystick with 4 axes, 6 when using a joystick with 3 axes
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106 and 8 when using a joystick with 2 axes. Notice however these are limitations
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107 of the Joystick Port hardware, not OS/2.
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108
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111 6. Proportional windows
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112 -----------------------
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113
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114 For some SDL applications it can be handy to have proportional windows, so
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115 the windows will keep their aspect ratio when resized.
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116 This can be achieved in two ways:
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117
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118 - Before starting the given SDL application, set the
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119 SDL_USE_PROPORTIONAL_WINDOW environment variable to something, e.g.:
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120
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121 SET SDL_USE_PROPORTIONAL_WINDOW=1
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122 dosbox.exe
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123
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124 - If you have a HOME environment variable set, then SDL will look for a file
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125 in there called ".sdl.proportionals". If that file contains the name of the
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126 currently running SDL executable, then that process will have proportional
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127 windows automatically.
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128
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129 Please note that this file is created automatically with default values
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130 at the first run.
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131
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132
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133
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134 7. Audio in SDL applications
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135 ----------------------------
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136
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137 Audio effects are one of the most important features in games. Creating audio
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138 effects in sync with the game and without hickups and pauses in the audio are
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139 very important things.
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140
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141 However there are multithreaded SDL applications that have tight loops as their
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142 main logic loop. This kills performance in OS/2, and takes too much CPU from
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143 other threads in the same process, for example from the thread to create the
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144 sound effects.
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145
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146 For this reason, the OS/2 port of SDL can be instructed to run the audio thread
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147 in high priority, which makes sure that there will be enough time for the
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148 processing of the audio data.
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149
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150 At default, SDL/2 runs the audio thread at ForegroundServer+0 priority. Well
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151 written and well behaving SDL applications should work well in this mode.
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152 For other applications, you can tell SDL/2 to run the audio thread at
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153 TimeCritical priority by setting an env.variable before starting the SDL app:
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154
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155 SET SDL_USE_TIMECRITICAL_AUDIO=1
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156
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157 Please note that this is a bit risky, because if the SDL application runs a
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158 tight infinite loop in this thread, this will make the whole system
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159 unresponsive, so use it with care, and only for applications that need it!
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160
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161
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162
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163 8. Next steps...
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164 ----------------
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165
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166 Things to do:
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167 - Implement missing stuffs (look for 'TODO' string in source code!)
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168 - Finish video driver (the 'wincommon' can be a good example for missing
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169 things like application icon and so on...)
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170 - Enable MMX/SSE/SSE2 acceleration functions
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171 - Rewrite CDROM support using DOS Ioctl for better support.
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172
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173
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174
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175 9. Contacts
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176 -----------
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177
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178 You can contact the developers for bugs:
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179
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180 Area Developer email
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181 General (Audio/Video/System) Doodle doodle@scenergy.dfmk.hu
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182 CDROM and Joystick Caetano daniel@caetano.eng.br
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183
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184 Notice however that SDL/2 is 'in development' stage so ... if you want to help,
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185 please, be our guest and contact us!
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186
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187
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188
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189 10. Changelog of the OS/2 port
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190 ------------------------------
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191
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192 Version 1.2.10 - 2006-05-17 - Doodle
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193 - Small modifications for v1.2.10 release
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194 - Changed DLL name to include version info (currently SDL12.dll)
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195
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196 Version 1.2 - 2006-05-01 - Doodle
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197 - Modified makefile system to have only one makefile
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198 - Included FSLib headers, DLL and LIB file
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199
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200 Version 1.2 - 2006-02-26 - Doodle
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201 - Updated the official SDL version with the OS/2 specific changes.
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202 - Added support for real unicode keycode conversion.
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203
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204 Version 1.2.7 - 2006-01-20 - Doodle
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205 - Added support for selectively using timecritical priority for
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206 audio threads by SDL_USE_TIMECRITICAL_AUDIO environment variable.
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207 (e.g.:
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208 SET SDL_USE_TIMECRITICAL_AUDIO=1
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209 dosbox.exe
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210 )
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211
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212 Version 1.2.7 - 2005-12-22 - Doodle
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213 - Added support for proportional SDL windows.
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214 There are two ways to have proportional (aspect-keeping) windows for
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215 a given SDL application: Either set the SDL_USE_PROPORTIONAL_WINDOW
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216 environment variable to something before starting the application
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217 (e.g.:
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218 SET SDL_USE_PROPORTIONAL_WINDOW=1
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219 dosbox.exe
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220 )
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221 or, if you have the HOME environment variable set, then SDL12.DLL will
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222 create a file in that directory called .sdl.proportionals, and you can
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223 put there the name of executable files that will be automatically made
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224 proportional.
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225
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226 Version 1.2.7 - 2005-10-14 - Doodle
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227 - Enabled Exception handler code in FSLib to be able to restore original
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228 desktop video mode in case the application crashes.
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229 - Added the missing FSLib_Uninitialize() call into SDL.
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230 (The lack of it did not cause problems, but it's cleaner this way.)
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231 - Fixed a mouse problem in Fullscreen mode where any mouse click
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232 re-centered the mouse.
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233
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234 Version 1.2.7 - 2005-10-09 - Doodle
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235 - Implemented window icon support
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236
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237 Version 1.2.7 - 2005-10-03 - Doodle
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238 - Reworked semaphore support again
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239 - Tuned thread priorities
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240
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241 Version 1.2.7 - 2005-10-02 - Doodle
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242 - Added support for custom mouse pointers
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243 - Fixed WM_CLOSE processing: give a chance to SDL app to ask user...
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244 - Added support for MMX-accelerated audio mixers
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245 - Other small fixes
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246
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247 Version 1.2.7 - 2005-09-12 - Doodle
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248 - Small fixes for DosBox incorporated into public release
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249 - Fixed semaphore support (SDL_syssem.c)
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250 - Fixed FSLib to have good clipping in scaled window mode,
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251 and to prevent occasional desktop freezes.
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252
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253 Version 1.2.7 - 2004-09-08a - Caetano
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254 - Improved joystick support (general verifications about hardware).
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255 - Added support up to 8 buttons in 2 axes joysticks and 6 buttons in 3 axes joysticks.
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256 - Added support to environment variable SDL_OS2_JOYSTICK to specify a joystick.
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257 - Improved Joystick test to handle every type of joystick and display only relevant information.
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258 - Merged with Doodle 2004-09-08
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259 - Little tid up in README.OS2
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260 - Added explanation about SDL_OS2_JOYSTICK environment variable on README.OS2
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261
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262 Version 1.2.7 - 2004-09-07 - Caetano
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263 - Merged with changes in headers for GCC compiling.
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264 - Added Joystick support using basic IBM GAME$ support, allowing it to work with all joystick drivers since OS/2 2.1.
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265 - Improved joystick detection (hacked!). OS/2 do not allow real joystick detection, so...
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266 - Modified makefile in test to compile "testjoystick". Anyway, it's useless, since it seems to cause a lot of trouble in OS/2 (because os video routines, not Joystick support).
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267 - Created separated Joystick test program to test only joystick functions.
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268 - Improved joystick auto-centering.
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269 - Improved the coordinate correction routine to use two scale factors for each axis.
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270
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271 Version 1.2.7 - 2004-07-05 - Caetano
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272 - Corrected the time returned by status in CDROM support (it was incorrect)
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273 - Added the testcdrom.c and corrected the linking directive (it was causing an error)
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274
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275 Version 1.2.7 - 2004-07-02a - Caetano
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276 - Corrected a little problem in a comment at SDL-1.2.7\test\torturethread.c, line 18 (missing */, nested comment)
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277 - Added CDROM support to tree (SDL-1.2.7\src\cdrom\os2\SDL_syscdrom.c)
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278 - Modified makefile (SDL-1.2.7\src\makefiles.wat and SDL-1.2.7\watcom.mif) to build with CDROM support
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279 - Added the "extra" SDL_types.h forgotten in 2004-07-02 version.
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280
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281 <End-Of-File>