libstrangle

Frame rate limiter for Linux/OpenGL.

Usage

Cap the FPS (frames per second) of a chosen game by including libstrangle.so in LD_PRELOAD. The environment variable FPS needs to be set first. Example:

export FPS=60
LD_PRELOAD="libstrangle.so:${LD_PRELOAD}" /path/to/game

The included script strangle.sh, which installs into your PATH as just "strangle", can be used to simplify this. Examples:

strangle 60 /path/to/game

Vertical sync can be controlled by setting the VSYNC environment variable. 0 to turn off, 1 and higher to turn on. Higher numbers will result in lower FPS. 2 will give FPS equal to half the refresh rate, 3 to one third etc. -1 might give adaptive vsync (unconfirmed). Examples:

VSYNC=2 strangle /path/to/game
VSYNC=1 strangle 40 /path/to/game

Steam

You can use this with Steam by right-clicking on a game in your library and selecting Properties and then SET LAUNCH OPTIONS... under the General tab. In the input box type: strangle <somenumber> %command%

Building

If you installed a version before 2016-05-17 you should manually remove the files /usr/bin/strangle, /usr/lib/i386-linux-gnu/libstrangle.so and /usr/lib/x86_64-linux-gnu/libstrangle.so - The paths have changed. Typically you'll use these commands to build the program

make
sudo make install

Debian, Ubuntu and derivates may need the libc6-dev-i386 package.

OpenSUSE needs these packages:

glibc-devel-32bit
gcc
gcc-32bit

Compatibility

As of 2017-02-07 it seems to work with most games, including WINE.

Errata

Might crash if used together with other libs that hijack dlsym, such as Steam Overlay. It seems to work with Steam Overlay when placed at the end of LD_PRELOAD for some reason.