Dawn Build for target Android

[Sohan Jyoti Ghosh]

Hi.

There are a few flags around the code like, is _android, DAWN_PLATFORM_ANDROID. 

Does Dawn build at this stage for Android, is there some gn flags to enable compilation (even with errors/missing pieces) ?

Br,

Sohan

[Corentin Wallez]

Hey Sohan,

tl;dr: tests were running a while ago but we haven't tried since.

I brought up Dawn on Android a while ago by having a Chromium checkout on Linux set up to build Android, adding the dawn_end2end_tests and dawn_unittests targets under is_android in Chromium's main BUILD.gn file and building them. The dawn_end2end_tests ran with a couple failures on a Pixel 4.

That was a while ago and we haven't tried building for Android since but it should be fairly easy to get it compiling again. Note that while the tests were running, it was without rendering to the screen: the swapchain support on Android hasn't been started at all.

Hopefully this helps, let us know if you have more questions!

Corentin

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[Sohan Jyoti Ghosh]

Thanks Corentin ! That indeed builds fine and the tests run all right on ToT ! Though the num failures in my Pixel 3 is 40 odd.

Just wondering, is there a way we can build this independently for Android, without the Chromium tool chain ? On a stand-alone dawn checkout.

Br,

Sohan

[Corentin Wallez]

Hey Sohan,

We've never tested building standalone for Android, because building in Chromium made it super easy to run tests on a connected Android device. It might work but most likely some Android-specific build rules will be missing and it's not clear how hard it will be to run the test executables on a device.

Cheers,

Corentin

[Sohan Jyoti Ghosh]

Thanks Corentin for all the info ! 

Br,

Sohan

[Sohan Jyoti Ghosh]

Hi Corentin,

Was trying to set up some of the samples in Android next (I understand the window and swapchains are not done yet, was planning to hack at them too)

But the basic build itself throws some odd GN dependency error ?

This is on a Chromium ToT checkout,

ninja -C out/Debug CppHelloTriangle
ninja: Entering directory `out/Debug'
[1/1] Regenerating ninja files
FAILED: build.ninja
../../buildtools/linux64/gn --root=../.. -q gen .
ERROR Unresolved dependencies.
//:gn_all(//build/toolchain/android:android_clang_arm)
  needs //third_party/dawn:CppHelloTraingle(//build/toolchain/android:android_clang_arm)

ninja: error: rebuilding 'build.ninja': subcommand failed

Any idea, what maybe the issue ? dawn_end2end_tests and dawn_unittests builds fine though.

I added  

//third_party/dawn:CppHelloTraingle to  Chromium's main src/BUILD.gn

Br,

Sohan

[Corentin Wallez]

I think you misspelled triangle as traingle.

[Sohan Jyoti Ghosh]

Oops that was a bad one ! Thanks for correcting it. 

But, that doesn't solve the problem though, 

ninja -C out/Debug CppHelloTriangle
ninja: Entering directory `out/Debug'
[1/1] Regenerating ninja files
FAILED: build.ninja
../../buildtools/linux64/gn --root=../.. -q gen .
ERROR Unresolved dependencies.
//:gn_all(//build/toolchain/android:android_clang_arm)

  needs //third_party/dawn:CppHelloTriangle(//build/toolchain/android:android_clang_arm)

ninja: error: rebuilding 'build.ninja': subcommand failed

Br,

Sohan

[Corentin Wallez]

IDK, is CppHelloTriangle in dawn/BUILD.gn? We just move it to examples so it would be //third_party/dawn/examples:CppHelloTriangle.

[Sohan Jyoti Ghosh]

Right ! There seems to be some newer commit to change the dawn/BUILD.gn.

Now, I see some assertion errors of dawn_standalone, that's more understandable. Thanks !

I will have a look.

Br,

Sohan