[squeak-dev] Re: Still pounding head against wall over glReadPixels
=> external buffer
lenglish5 at cox.net
Wed Feb 10 20:33:32 UTC 2010
Andreas Raab wrote:
> Lawson English wrote:
>> I'm still having problems with my external shared memory thingie. I
>> can evoke the unix shm* calls and obtain a reference to a shared
>> memory buffer and attach it to squeak's heap. I can write into it and
>> read back. I can even attach the same shared memory to two different
>> instances of squeak and write to the buffer in one and read it with
>> the other. What I still cannot figure out is how to take that
>> external buffer and direct the OpenGL>>glReadPixels call to it so
>> that I can draw using squeak and have it become a bitmap for a
>> different application.
> Post your code. Using glReadPixels is straightforward, so there must
> be something simple in your code that goes wrong. Simply speaking the
> following should work fine:
> "Allocate or obtain shared memory buffer"
> xHandle := ExternalHandle allocate: rect width * rect height * 4.
Confused. ExternalHandle is...?
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