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Documentation
We are starting to document the Virtual Machine as a form of a Pharo book.
- https://github.com/SquareBracketAssociates/Booklet-PharoVirtualMachine The contents is limited for now. What is important to understand is that we are reverse engineering the Virtual Machine logic as executable unit tests and they are committed in branches of this repository.
There are other sources of documentation
- https://clementbera.wordpress.com Clement is the designer and implementor of the Sista system.
- http://www.mirandabanda.org/cogblog/ Eliot is the father of the Cog VM and Spur memory management.
Pharo offered SDL support for windowing systems since years but it was not the main one. The consortium is doing an effort in removing event and windowing handling from the VM and to use external libraries such as SDL2.0. New versions of Pharo are moving to full SDL support in the context of the headless VM.
Pharo is using SDL already, the headless VM already uses it from the image to unify world UI in the different platforms. The world with SDL (if you run the image with the headless VM, where the VM is headless but the image handles the UI) has smooth scrolling and better handling of events.
There are two things in plan:
- (1) a backward compatibility plugin to execute Pharo 7 images (and maybe older) in the headless VM,
- and (2) some little improvements in the SDL support (VM + image) to make it run smoothly in the idle VM (now it requires a loop pooling the events, we want a push model).
wget -O - get.pharo.org/64/80+vmHeadlessLatest | bash
and then if you run the
./pharo-ui Pharo.image
it will be using SDL
Also you can download the VM separated.