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Add turnip driver build guide (#54) 

Adds a section on building an installable turnip driver package to the android build documentation.

Currently set to WIP because I would like to get some feedback and possibly improve the guide before merging.

Reviewed-on: http://vub63vv26q6v27xzv2dtcd25xumubshogm67yrpaz2rculqxs7jlfqad.onion/torzu-emu/torzu/pulls/54
Co-authored-by: echosys <echosys@noreply.localhost>
Co-committed-by: echosys <echosys@noreply.localhost>
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echosys 2024-09-25 17:21:42 +00:00 committed by spectranator
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commit ec2e6dfdac
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build-for-android.md
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@ -61,3 +61,69 @@ cd src/android
```
The APK will be at `src/android/app/build/outputs/apk/mainline/release/app-mainline-release.apk`
## Building an installable turnip driver package
Adapted from the mesa documentation [here](https://docs.mesa3d.org/android.html#building-using-the-android-ndk) and the released zip in [this](https://github.com/K11MCH1/AdrenoToolsDrivers) GitHub repo.
### Dependencies
Follow the steps to setup a CLI build above and additionally run
```
sudo apt-get install -y python3-mako python3-yaml byacc flex
```
to install some additional required packages.
Create a file `~/.local/share/meson/cross/android-aarch64` with the following content:
```
[binaries]
ar = '/opt/android-sdk/ndk/26.3.11579264/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar'
c = ['/opt/android-sdk/ndk/26.3.11579264/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android30-clang']
cpp = ['/opt/android-sdk/ndk/26.3.11579264/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android30-clang++', '-fno-exceptions', '-fno-unwind-tables', '-fno-asynchronous-unwind-tables', '-static-libstdc++']
c_ld = 'lld'
cpp_ld = 'lld'
strip = '/opt/android-sdk/ndk/26.3.11579264/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip'
pkg-config = ['env', 'PKG_CONFIG_LIBDIR=/opt/android-sdk/ndk/26.3.11579264/toolchains/llvm/prebuilt/linux-x86_64/python3/lib/pkgconfig', '/usr/bin/pkg-config']
[host_machine]
system = 'android'
cpu_family = 'aarch64'
cpu = 'armv8'
endian = 'little'
```
This informs `meson` (the build system used by mesa) about the Android NDK tools.
If you need to modify this file with newer versions you can use a command like `find /opt/android-sdk -name "aarch64-linux-android*-clang"` to find the new paths.
### Clone the mesa git repo
```
git clone https://gitlab.freedesktop.org/mesa/mesa.git
```
Then use `git checkout <version>` to checkout the version you want to build (for example `mesa-24.2.0`).
### Compiling the turnip driver
```
meson setup build-android-aarch64 --cross-file android-aarch64 -Dplatforms=android -Dplatform-sdk-version=30 -Dandroid-stub=true -Dgallium-drivers= -Dvulkan-drivers=freedreno -Dfreedreno-kmds=kgsl -Dbuildtype=release
meson compile -C build-android-aarch64
```
### Create an installable driver package
Check the file `VERSION` for the Mesa version and the file `include/vulkan/vulkan_core.h` and look for `VK_HEADER_VERSION_COMPLETE` for the Vulkan version.
Create a file named `meta.json` with the following content (replacing the `<placeholders>`)
```
{
"schemaVersion": 1,
"name": "Mesa Turnip Driver <mesa_version>",
"description": "Compiled from source.",
"author": "<name>",
"packageVersion": "1",
"vendor": "Mesa",
"driverVersion": "Vulkan <vulkan_version>",
"minApi": 30,
"libraryName": "libvulkan_freedreno.so"
}
```
and run these commands to create the package
```
mv ./build-android-aarch64/src/freedreno/vulkan/libvulkan_freedreno.so libvulkan_freedreno.so
zip turnip.zip meta.json libvulkan_freedreno.so
```