[squeak-dev] 64 bit FFI (was: porting Croquet to Squeak6.0 alpha...)

Bert Freudenberg bert at freudenbergs.de
Wed Mar 11 22:57:39 UTC 2020

I'd suggest to get OpenGL working outside of Croquet first:


Step 1: Verify this works in 32 bits. (assuming you are doing this on
Linux, you can run 32 bit Squeak side-by-side with the 64 bit one)
Step 2: Make it work in 64 bits.

The second step requires that you understand how FFI works, and how it
handles e.g. pointers and integer sizes.
I am assuming we do have a working 64 bit FFI, at least for x86_64 machines.

E.g. the OGLUnix>>glExtGetProcAddress: method returns a pointer. On a 32
bit system, that fits into a 'ulong' which is 32 bits. On a 64 bit system,
a pointer is 64 bits wide so it would not fit into a 32 bit word. Now I
don't know how many bits 'ulong' has in our 64 bit FFI, but that
declaration may have to change. Etc. pp.

If you have questions about FFI then those are best directed at the vm-dev
list since it is dealing with VM-level interfaces. CC'ing, please follow up

- Bert -

On Wed, Mar 11, 2020 at 2:54 PM gettimothy via Squeak-dev <
squeak-dev at lists.squeakfoundation.org> wrote:

> Okey dokey,
> Poking along, there is a stray glyph in OGLUnix openGLLibraryName after
> openGLLibraryName
> ^Smalltalk osVersion = 'linux'
> ifTrue: ['libGL.so.1']
> ifFalse: ['GL']
> I removed it in my install and got past that error.
> Working exclusively with Croquet(Master)...
> My next error is in OGLUnixX11LE(OpenGL)>>glMatrixMode:
> glMatrixMode: mode
> "This method was automatically generated."
> "void glMatrixMode(GLenum mode);"
> <apicall: void 'glMatrixMode' (ulong) module: '#openGLLibraryName'>
> ^self externalCallFailed
> The <apicall:...> fails
> How to think about this?
> Is Croquet behind OpenGL latest?
> Would teaching myself OpenGL programming be of use to the Croquet project?
> cheers,
> tty
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