Mercurial > sdl-ios-xcode
view README.wscons @ 1585:980d2a0dc2a3
Date: Tue, 4 Mar 2003 15:05:31 -0800
From: "Jim"
Subject: [SDL] Frame Buffer patches...
Okay I'm new at patch generation - so please tell me if there's a better way
I could have done this.
Attached are two patch files generated with 'cvs diff -u'
SDL-fb-open-lock.patch applies to SDL_fbvideo.c
Modifies the open loop to check /dev/fb/0 found on devfs...
Modifies the lock code to return failure if the current virtual terminal
is not the one opened for frame buffer writing...
Lock would hang forever if switched away (ctrl-alt-F1) ...
SDL-fb-mousedrv-screensave.patch applies to SDL_fbevents.c
Switches default mouse mode based on SDL_MOUSEDRV - currently only
accepts PS2 - otherwise default is MS Mouse.
When the screen is switched - exisiting code (wrapped in ifdef
SAVE_SCREEN_COTENTS) would save the wrong bit of the screen....
( I run frame buffer 1600x1200, the size I requested was 800x600 - the
save would save the top 800 lines (non biased) and restore them... Adding
screen->offset fixed that )
However, if that option is not set, then a call to SDL_UpdateRect (full
screen) is made. (which may have had it's contents changed since the screen
is not entirely locked because of lock-failure patch)
Jim
[patches slightly tweaked for SDL 1.2.10]
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 22 Mar 2006 07:48:22 +0000 |
parents | 19d8949b4584 |
children |
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============================================================================== Using the Simple DirectMedia Layer with OpenBSD/wscons ============================================================================== The wscons SDL driver can be used to run SDL programs on OpenBSD without running X. So far, the driver only runs on the Sharp Zaurus, but the driver is written to be easily extended for other machines. The main missing pieces are blitting routines for anything but 16 bit displays, and keycode maps for other keyboards. Also, there is no support for hardware palettes. There is currently no mouse support. To compile SDL with support for wscons, use the "--enable-video-wscons" option when running configure. I used the following command line: ./configure --disable-oss --disable-ltdl --enable-pthread-sem \ --disable-esd --disable-arts --disable-video-aalib \ --enable-openbsdaudio --enable-video-wscons \ --prefix=/usr/local --sysconfdir=/etc Setting the console device to use ================================= When starting an SDL program on a wscons console, the driver uses the current virtual terminal (usually /dev/ttyC0). To force the driver to use a specific terminal device, set the environment variable SDL_WSCONSDEV: bash$ SDL_WSCONSDEV=/dev/ttyC1 ./some-sdl-program This is especially useful when starting an SDL program from a remote login prompt (which is great for development). If you do this, and want to use keyboard input, you should avoid having some other program reading from the used virtual console (i.e., do not have a getty running). Rotating the display ==================== The display can be rotated by the wscons SDL driver. This is useful for the Sharp Zaurus, since the display hardware is wired so that it is correctly rotated only when the display is folded into "PDA mode." When using the Zaurus in "normal," or "keyboard" mode, the hardware screen is rotated 90 degrees anti-clockwise. To let the wscons SDL driver rotate the screen, set the environment variable SDL_VIDEO_WSCONS_ROTATION to "CW", "CCW", or "UD", for clockwise, counter clockwise, and upside-down rotation respectively. "CW" makes the screen appear correct on a Sharp Zaurus SL-C3100. When using rotation in the driver, a "shadow" frame buffer is used to hold the intermediary display, before blitting it to the actual hardware frame buffer. This slows down performance a bit. For completeness, the rotation "NONE" can be specified to use a shadow frame buffer without actually rotating. Unsetting SDL_VIDEO_WSCONS_ROTATION, or setting it to '' turns off the shadow frame buffer for maximum performance. Running MAME ============ Since my main motivation for writing the driver was playing MAME on the Zaurus, I'll give a few hints: XMame compiles just fine under OpenBSD. I'm not sure this is strictly necessary, but set MY_CPU = arm in makefile.unix, and CFLAGS.arm = -DLSB_FIRST -DALIGN_INTS -DALIGN_SHORTS in src/unix/unix.max to be sure. The latest XMame (0.101 at this writing) is a very large program. Either tinker with the make files to compile a version without support for all drivers, or, get an older version of XMame. My recommendation would be 0.37b16. When running MAME, DO NOT SET SDL_VIDEO_WSCONS_ROTATION! Performace is MUCH better without this, and it is COMPLETELY UNNECESSARY, since MAME can rotate the picture itself while drawing, and does so MUCH FASTER. Use the Xmame command line option "-ror" to rotate the picture to the right. Acknowledgments =============== I studied the wsfb driver for XFree86/Xorg quite a bit before writing this, so there ought to be some similarities. -- Staffan Ulfberg <staffan@ulfberg.se>