Comments (6)
Could you point me at some code that would use this? Is this for the sparse copy compute shader you are using (where you write the new data in a new buffer and then copying it in the proper spots in the destination buffer)?
from encase.
Yeah that's the intended use case - using sparse copies to update a buffer that is laid out like https://github.com/BVE-Reborn/rend3/blob/trunk/rend3-routine/shaders/src/structures.wgsl#L48-L51. The above struct is what I ideally would be the equivalent encase declaration.
from encase.
I am writing a particle physics simulator and this would also be very useful for me. I have several very large arrays of structs on GPU memory, and I need to write to a few elements at a time, sometimes even just a single field of a struct. It is also desirable to get the value that was stored there previously, though that would probably happen on the next frame.
from encase.
Actually, a variation of this feature should already be available. The ShaderType
trait has an associated constant METADATA
with offsets/stride.
Polishing this API would be a next step but I'd like to see how people use it first.
Let me know if you come up with something (using METADATA
) that could provide a direction for the polished API.
from encase.
The actual Metadata structs I think aren't documented in any form. The latest version on doc.rs doesn't even show the METADATA constant on the trait.
I'm also interested in this as we're looking into preallocating buffer space for parallelizing buffer writes in Bevy (see bevyengine/bevy#12489)
from encase.
The metadata was meant to be internal to encase but it seems people are interested in exposing it somehow.
The main question is how would the API look like? I can see it looking quite differently depending on how it will be used.
It might be worth experimenting with an API outside encase (which would use the metadata) at first.
from encase.
Related Issues (20)
- How can you pad array of structures properly? HOT 2
- Allow a `Vec` newtype to be used within uniform buffers
- nalgebra support: ShaderSize is not implemented for Matrix<f32, Const<3>... HOT 10
- Provide a way to lay out structs with fields that are unknowable at compile time
- New release HOT 1
- Derived ShaderType rust-analyzer error HOT 3
- Consider updating `encase_derive_impl` to use `syn@2` HOT 3
- Provide a way to fetch whether a ShaderType is runtime sized or not HOT 2
- Consider inlining hot functions for primitives, vectors, and matricies HOT 1
- Stride of [f32; 4] fields in struct HOT 1
- Array stride in uniform address space HOT 1
- Not possible to retrieve the *aligned* written size? HOT 1
- Consider reexporting crates for which `ShaderType` are implemented HOT 3
- Specialize write_into for trivially memcpy-able types HOT 4
- Implement `ShaderType` for packed types HOT 2
- MIRI reports UB on `<Vec<u8> as ByteVecExt>::try_extend_zeroed` HOT 2
- Wrong min_size() for struct HOT 4
- Implement `ShaderType` for `u64` and `i64` HOT 1
- How to Derive `Shadertype` for generic structs without unsafe code? HOT 3
- Vector of Structs support HOT 3
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from encase.