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Add dcomp on windows #7550

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@n1ght-hunter n1ght-hunter commented Apr 16, 2025

Connections
#3486
#7108
#5150

Description
This adds dcomp support to the dx12 backend.
My main goal for this was to get window transparency to work on windows

Testing
Tested using a basic wgpu app with transparency

Squash or Rebase?
Squash

Checklist

  • Run cargo fmt.
  • Run taplo format.
  • Run cargo clippy --tests. If applicable, add:
    • --target wasm32-unknown-unknown
  • Run cargo xtask test to run tests.
  • If this contains user-facing changes, add a CHANGELOG.md entry.

I dont know if its normal or not but when running cargo xtask test i had 201 tests fail with code 0xc0000005: Invalid access to memory location. (os error 998) this is run on windows 10

@n1ght-hunter n1ght-hunter requested review from crowlKats and a team as code owners April 16, 2025 06:17
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@cwfitzgerald cwfitzgerald left a comment

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Generally looking good, some comments.

@cwfitzgerald cwfitzgerald self-assigned this Apr 16, 2025
@n1ght-hunter
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n1ght-hunter commented Apr 17, 2025

will get to this in the next day or two

@n1ght-hunter
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@cwfitzgerald would you be able to re review when you get time thanks

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Sorry for the delay, looks good in general with a few small comments. I also think that the hardcoded list of blending modes needs to be adjusted based on if DXGI or DComp is selected

}

impl DCompState {
pub fn get_or_init(
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This function should also be unsafe

Comment on lines +66 to +72
let dcomp_device = {
profiling::scope!("DirectComposition::DCompositionCreateDevice");
unsafe {
DirectComposition::DCompositionCreateDevice::<
_,
DirectComposition::IDCompositionDevice,
>(&dxgi_device)
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Suggested change
let dcomp_device = {
profiling::scope!("DirectComposition::DCompositionCreateDevice");
unsafe {
DirectComposition::DCompositionCreateDevice::<
_,
DirectComposition::IDCompositionDevice,
>(&dxgi_device)
let dcomp_device: DirectComposition::IDCompositionDevice = {
profiling::scope!("DirectComposition::DCompositionCreateDevice");
unsafe {
DirectComposition::DCompositionCreateDevice(&dxgi_device)

This feels cleaner

@Anutrix
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Anutrix commented May 30, 2025

Might totally be unfounded and not apply here but DirectComposition on Windows has issues with NVIDIA GPU when used with multiple monitors with different and high(60+) refresh rates. This was seen on Firefox so might be specific to it.
Recent ticket: https://bugzilla.mozilla.org/show_bug.cgi?id=1968876 . Couldn't find original ticket.

@cwfitzgerald
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I definitely wouldn't worry about it here. That issue seems to be Windows 10 specific too.

@melody-rs
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Oh! Thank you for doing this, transparency support in wgpu has been a pretty big pain point for me in the past

@n1ght-hunter
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Im just traveling abroad atm should be able to get to this in the next week or so

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4 participants