At present, the emulation code of ScummVM is wrapped with libco. This PR adds a new compile-time option (USE_LIBCO) which can be disabled to instead use a pthreads-based mechanism. It is implemented in exactly the same fashion as https://github.com/libretro/gpsp/pull/81.
The purpose of this is twofold:
1) libco is fine, but can cause strange and unpredictable behaviour when used with code not specifically designed around it. Setting USE_LIBCO = 0 can therefore be useful for debugging.
2) We simply don't have working libco implementations for all platforms. A notable example is OpenDingux - attempting to use libco on OpenDingux causes the instant death of the process...
Since we now have a working libco alternative, it has been possible to add an OpenDingux target to the makefile + .gitlab-ci.yml file. For the OpenDingux build:
MT32 emulation is disabled (it is too slow)
FluidSynth emulation is enabled (and works well)
All engines that deal exclusively with high resolution (640x480+) games have been disabled - they are too slow for any practical use
The overlay (ScummVM menu) resolution has been reduced to 320x240 (since the default 640x480 is unusable on OpenDingux devices with 320x240 displays)
All non-high-resolution games seem to run full speed.
Note: USE_LIBCO is set to 1 for all builds apart from OpenDingux
At present, the emulation code of ScummVM is wrapped with libco. This PR adds a new compile-time option (
USE_LIBCO) which can be disabled to instead use a pthreads-based mechanism. It is implemented in exactly the same fashion as https://github.com/libretro/gpsp/pull/81.The purpose of this is twofold:
1) libco is fine, but can cause strange and unpredictable behaviour when used with code not specifically designed around it. Setting
USE_LIBCO = 0can therefore be useful for debugging.2) We simply don't have working libco implementations for all platforms. A notable example is OpenDingux - attempting to use libco on OpenDingux causes the instant death of the process...
Since we now have a working libco alternative, it has been possible to add an OpenDingux target to the makefile + .gitlab-ci.yml file. For the OpenDingux build:
All non-high-resolution games seem to run full speed.
Note:
USE_LIBCOis set to1for all builds apart from OpenDingux