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<Bubblegumdrop>
How do I convert a lisp array for use as a C array? is there somewhere I can read more about this? http://paste.debian.net/1328263/
<ixelp>
debian Pastezone
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<kanuba>
You'd have to allocate the array of rects with cffi, or build one from the fields of the rect struct of the rects in that list. CL lists and CFFI don't match very well
<kanuba>
If you had a vector of the proper numerical elements, and they weren't boxed, you could pin the array, or use cffi:with-pointer-to-vector-data
<ixelp>
GitHub - sionescu/static-vectors: Allocate SIMPLE-ARRAYs in static memory
<aeth>
vectors, not lists
<aeth>
even if you start out with a list or a non-static-vector adjustable vector, using REPLACE on a static-vector may be more convenient than doing it the CFFI way
<kanuba>
static-vectors will allow you to allocate a foreign array with a lisp interface for manipulating it, but getting a pointer to an existing lisp data structure is different.
<kanuba>
cffi:with-pointer-to-vector-data is handy for wrapping the foreign sdl api, for things like creating a surface from a simple-array of pixels
<Bubblegumdrop>
I think that's what I want, thanks...
<kanuba>
autowrap adds a whole new complexity though, as I see you're using cl-sdl2. it uses objects that wrap pointers, rather than pointers.
<Bubblegumdrop>
I did this once before with libpng but honestly have no idea what I did to get it right...
<aeth>
wrapped pointers (as in cl-sdl2/autowrap) are not a good idea
<aeth>
I think they exist because cl-sdl2 used to have finalizers, which got removed because they are not a good idea?
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<aeth>
you really want the C stuff in unwind-protect instead of random magic happening in places
<Bubblegumdrop>
I'm using sdl2kit, I think it wraps the ,@body in unwind-protect
<aeth>
iirc, sdl2kit is just added magic on top of cl-sdl2, of the wrong kind of magic
<kanuba>
Note that you will have to ship libsdl2-compat in addition to libsdl2 soon if not wrapping sdl yourself
<kanuba>
(sdl3 is finalized and will be hitting distribution package managers relatively shortly)
<kanuba>
it has a fairly different API, and shaders
<kanuba>
the compat will allow sdl2 apps to run on sdl3
<aeth>
good opportunity for something to finally replace cl-sdl2, though
<aeth>
which most people still seem to use
<Bubblegumdrop>
well I'd like to be using trial but it's just too fancy for me
<kanuba>
I like to keep things simple and use my own sdl2 bindings (which do not include the software rendering api functions that you are using, so it wouldn't be of much use).
<Bubblegumdrop>
I really ought to spend more time looking at gilberth's ffi thingy
<Bubblegumdrop>
It's probably a lot simpler
<aeth>
cl-sdl2 (and to some extent autowrap) has some really bizarre design decisions, which you will encounter if you encounter bugs or incomplete parts of cl-sdl2, which you will, because its author afaik stopped using Lisp 7 or so years ago
<aeth>
though cl-sdl2 does get some bug fixes
<kanuba>
as the former maintainer of cl-sdl2, i concur. currently it is maintainer-less.
<aeth>
it was supposed to be higher level than a mere SDL2 wrapper (unlike e.g. cl-opengl and OpenGL), which means that there's a lot of performance-affecting, buggy, incomplete, undocumented, hard-to-explore stuff added on top
<aeth>
as opposed, again, to cl-opengl where you can just take C OpenGL references/tutorials and basically just translate them into CL
<aeth>
for an example of hard-to-explore, there's iirc a macrolet inside of a macro, so just a completely magical (form) that just exists inside of a macro body
<kanuba>
cl-sdl2 is also full of memory leaks and unimplemented (often needed) functions, some of which are not even caught by the low level bindings package, because autowrap can't parse C preprocessor macro decorations
<aeth>
a macrolet inside of a macro isn't M-.able in Emacs (to find the reference) so it will lead you down a several day wild goose chase. I don't care how fancy your macros are. Implement an entire language if you must. But somehow find a way to make M-. resolve for everything.
<ixelp>
SDL/include/SDL3/SDL_rect.h at b233beca47c0ab1dd00df041134726f7f2ccb6da · libsdl-org/SDL · GitHub
<kanuba>
The real problem with sdl2 (or 3) is its api, particularly its automatic memory management functionality, is poorly documented (it does reference counting and automatic freeing of some things)
<kanuba>
wrapping it can be tricky and double free corruption will haunt you (cl-sdl2) even does things wrong and causes leaks or corruption in cases)
<kanuba>
a testament that autowrap is not a cure, even a magical one
<aeth>
I wasn't aware of this. Is this the 2D API?
<kanuba>
It's everywhere
<kanuba>
SDL subsystem initializations are ref-counted. surfaces have an internal refcount slot, etc.
<kanuba>
SDL_GetNumAllocations() is exposed to show the number of allocations it tracks
<kanuba>
Which can be useful when trying to wrap things correctly, if you are insane enough to play that trial and error game across the kitchen sink
<kanuba>
some things are not meant to be manually freed, like pixelformat objects, but only in certain cases when they are not constructed automatically. It's really a mess.
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<Bubblegumdrop>
bruh
<Bubblegumdrop>
SDL2:LET-RECTS
<Bubblegumdrop>
thanks.
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<jasom>
Shinmera, fitzsim: Ciel is in the process of (or maybe already has) making the osicat dependency optional by switching out the two systems that depend on it (file-finder and moira).
<Shinmera>
I guess filesystem-utils would now be useful for replacing the former at least
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<jasom>
Shinmera: yes, I just tried it in the program I was writing and it was 10x faster than using sb-posix, which was already 4-8x faster than using the CL utilities
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<Shinmera>
now that's what I like to hear :)
<jasom>
Shinmera: though map-directory in filesystem-utils-7433b4a01c70ed9f82f360ec76a7a760990d65ae from the shirakumo ql dist appears to leak open file descriptors? If I run my test enough times it stops working.
<Shinmera>
really? that's surprising
<jasom>
Maybe it's something I'm doing; I'll try to reduce.
<Shinmera>
the fds should be closed via unwind protects.
<Shinmera>
indeed I can't reproduce an out-of-fd error.
<Shinmera>
just doing (dotimes (i 10000) (org.shirakumo.filesystem-utils:do-directory (f #p "/usr/include/" :recursive T)))
<jasom>
I run that twice with a directory tree that contains quite a few files; the length of the output is 705, which is the number of 2-deep directories. The second time it shows an error about nil not being an (or STRING PATHNAME) and if I try to e.g. compile a file with C-c C-k SBCL says "Too many open files"
<jasom>
does it maybe only happen with :type :directory ?
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<Shinmera>
shouldn't matter, the type only governs whether the callback is invoked
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<Shinmera>
If you have the time, stracing would probably be useful to figure out what it isn't closing
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<jasom>
Shinmera: it's doing an openat() with O_DIRECTORY followed by a readlink() on the FD, but not closing the resultant FD; this appears to be to test if it's a directory?
<Shinmera>
oh, I see, I was expecting it to recurse, in which case closedir will close the fd
<Shinmera>
easy fix, then
<Shinmera>
154903f
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<jasom>
Fixes my test-case
<jasom>
Thanks
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<Shinmera>
thanks for the test
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<younder>
In SBCL when asking prompt> <reply>.. reply ends up on the next line. How do I fix it?
<younder>
I cant see where the newline is coming from
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<jasom>
younder: It's probably that the terminal is echoing back characters typed in, including the newline that occurs when you hit enter.
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<jasom>
younder: but that's just a guess on what you've said; if you can give an example of what you mean, that would be good.
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<screwlisp>
Lispy gopher climate sooon -> anonradio.net . Aside from kmp's haiku and some of my programming stuff, talking a little about the parallels between one of artyom's articles, mine, many on loop and format and things.
<screwlisp>
I will look here during the show a bit.