[Vm-dev] Patches to SqueakFFIPrims and FFI-Kernel to support
"manual surfaces"
Josh Gargus
josh at schwa.ca
Sat Jan 30 22:25:21 UTC 2010
On Jan 30, 2010, at 11:54 AM, John M McIntosh wrote:
>
> Ah, well here is an interesting issue for you to solve then.
>
> http://bugs.squeak.org/view.php?id=5236
Another good one to be aware of, thanks. It's not biting me currently, so I'm going to try to push forward with my current goals.
Cheers,
Josh
>
>
> On 2010-01-30, at 10:27 AM, Josh Gargus wrote:
>
>> Hi,
>>
>> Here's a zip file that contains patches to SqueakFFIPrims (both Slang and C support files) and FFI-Kernels in order to support "manual surfaces", as embodied in the new class ExternalForm. There's a README in the zip file that describes how the changes fit together, so here I'll just describe the goal.
>>
>> The intent is to have a subclass of Form, ExternalForm, that uses an arbitrary pointer as the location of its pixel-data. It achieves this by acting as a client of SurfacePlugin much like any other, with the added twist of a primitive that enables Squeak code to set/clear the pointer. This is useful when working with such APIs as OpenGL and OpenCL, which provide a "map-image" API for interacting with images which reside in GPU memory. For example, if you want to access the updated contents of an OpenCL image, you would call clEnqueueMapImage(). This returns a pointer to CPU-accessible memory; by using this as the pointer for an ExternalForm, we can seamlessly use the OpenCL image just like any other Squeak Form.
>>
>> Cheers,
>> Josh
>>
>> <PatchesForExternalForm.zip>
>
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> John M. McIntosh <johnmci at smalltalkconsulting.com> Twitter: squeaker68882
> Corporate Smalltalk Consulting Ltd. http://www.smalltalkconsulting.com
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