Silk.NET•3y ago

maybe i am too tired to understand but this just converts a string to span? or something?

AAqua maybe i am too tired to understand but this just converts a string to span? or s...

Perksey•1/6/23, 9:54 PM

no, that's just one of the uses

AquaOP•1/6/23, 9:54 PM

ah
ok

Perksey•1/6/23, 9:54 PM

    public static implicit operator PointerLike<T>(T[] a) => new(){Span = a};

    public static implicit operator PointerLike<T>(T[] a) => new(){Span = a};

PPerksey _what_

TechPizza•1/6/23, 9:54 PM

we got UnscopedRef, Scoped refs, and ref fields, pick your poison

Perksey•1/6/23, 9:55 PM

i pick rust when

AAqua hm. been looking and seems like ```cs public class Thing { void* whatever; ...

AquaOP•1/6/23, 9:55 PM

so my question is
what is the best way to do this
i need to store a pointer to something in a struct like this
currently i used the fixed thing but seemingly that's incorrect
so i have no idea
ive never had any issues with it
but i'd rather there wasn't a chance to have any issues with it

Perksey•1/6/23, 9:56 PM

...i just gave you an example

Perksey•1/6/23, 9:56 PM

don't think of it as storing a pointer

Perksey•1/6/23, 9:56 PM

store a ref

Perksey•1/6/23, 9:56 PM

a ref can be anything

Perksey•1/6/23, 9:56 PM

managed, unmanaged

Perksey•1/6/23, 9:56 PM

the only plus being if it's managed, it'll still be GC tracked

TechPizza•1/6/23, 9:56 PM

i bet rollie wants to store it in an ECS .)

AquaOP•1/6/23, 9:56 PM

no, it's because i use the struct as the input parameter for my texture creation

PPerksey store a ref

AquaOP•1/6/23, 9:57 PM

interesting, although i am not on .net 7 so i can't use ref fields
hm

Perksey•1/6/23, 9:57 PM

yeah

Perksey•1/6/23, 9:57 PM

that doesn't use .net 7 ref fields

Perksey•1/6/23, 9:57 PM

i didn't know they existed until 5 seconds ago

Perksey•1/6/23, 9:57 PM

so it'd be impressive if i managed to use ref fields before knowing about it!

AAqua no, it's because i use the struct as the input parameter for my texture creation

TechPizza•1/6/23, 9:58 PM

take a pointer to a ref struct and pass that when

PPerksey i didn't know they existed until 5 seconds ago

TechPizza•1/6/23, 9:58 PM

you can take pointers to object locals now as well

Perksey•1/6/23, 9:58 PM

is that a GC hole

AquaOP•1/6/23, 9:58 PM

so basically
if i am understanding this
storing it as a span is the correct way to do it
instead of storing a raw pointer?
i think i have confused myself

AAqua so basically if i am understanding this storing it as a span is the correct way ...

Perksey•1/6/23, 9:58 PM

well storing it as a ref

PPerksey is that a GC hole

TechPizza•1/6/23, 9:58 PM

nope, pointers to locals with GC refs are now correctly tracked

Perksey•1/6/23, 9:58 PM

so that could be ref fields, or if you're on anything but .net 7 span is the way to do that

AquaOP•1/6/23, 9:58 PM

ah
gotcha

TechPizza•1/6/23, 9:59 PM

so you can do this:

object local = new();
object* ptr = &local;
PassToNative(ptr);

object local = new();
object* ptr = &local;
PassToNative(ptr);

TechPizza•1/6/23, 9:59 PM

it's a bit cursed but super useful

Perksey•1/6/23, 9:59 PM

TechPizza•1/6/23, 10:03 PM

way better than GC handles. i'm already using it in my V8 bindings lol

AquaOP•1/6/23, 10:03 PM

so i changed the struct from the pointer to the span and it doesn't seem to be complaining so i'm happy with this, thanks!

TTechPizza way better than GC handles. i'm already using it in my V8 bindings lol

TechPizza•1/6/23, 10:04 PM

although non-pinning GCHandle is still useful for long-term stuff in native

AquaOP•1/6/23, 10:06 PM

this also helped me understand my original question of why you need to deallocate the memory with silkmarshal instead of just using fixed on it so that's good too

AquaOP•1/6/23, 10:06 PM

how i have had 0 issues with what i've been doing i've got no idea, i wish i had had issues with it so i could have worked out the garbage i was doing earlier

AAqua how i have had 0 issues with what i've been doing i've got no idea, i wish i *ha...

TechPizza•1/6/23, 10:07 PM

if you created large arrays they probably got sent to LOH and rarely moved

AquaOP•1/6/23, 10:07 PM

ah
yeah
since it is texture data

AquaOP•1/6/23, 10:08 PM

wait

AquaOP•1/6/23, 10:08 PM

this is a problem

AquaOP•1/6/23, 10:09 PM

okay gc handles it is i guess
hopefully

Perksey•1/6/23, 10:10 PM

what's wrong with just storing a byte[]byte[] again?

AquaOP•1/6/23, 10:10 PM

it needs to be an

unmanaged

unmanaged

type

AquaOP•1/6/23, 10:10 PM

hm though

Perksey•1/6/23, 10:10 PM

TechPizza•1/6/23, 10:10 PM

why use an array when you can just make one thicc TextureData<T>

AquaOP•1/6/23, 10:10 PM

i might be able to remove that constraint now
i'll test

AquaOP•1/6/23, 10:11 PM

i considered that but i'd like it to be friendly for the user
i went the directx route of taking an array of subresourcedata

AquaOP•1/6/23, 10:12 PM

yeah i can remove that constraint lol
because my internal createtexture function just takes a pointer to the texturedata struct anyway
it used to be that it took an array which is what necessitated that type constraint

AquaOP•1/6/23, 10:16 PM

i think i'll still go the gchandle route though since i'd like textures to be able to use raw pointers if desired

maybe i am too tired to understand but this just converts a string to span? or something?

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