allwinner_a64/android/frameworks/native/vulkan

frameworks/native/vulkan

This subdirectory contains Android's Vulkan loader, as well as some Vulkan-related tools useful to platform developers.

Coding Style

We follow the Chromium coding style for naming and formatting, except with four-space indentation instead of two spaces. In general, any C++ features supported by the prebuilt platform toolchain are allowed.

Use "clang-format -style=file" to format all C/C++ code, except code imported verbatim from elsewhere. Setting up git-clang-format in your environment is recommended.

Code Generation

We generate several parts of the loader and tools from a Vulkan API description file, stored in api/vulkan.api. Code generation must be done manually because the generator tools aren't part of the platform toolchain (yet?). Files named foo_gen.* are generated from the API file and a template file named foo.tmpl.

To run the generator:

One-time setup

• Install golang, if you don't have it already.
• Create a directory (e.g. $HOME/lib/go) for local go sources and binaries and add it to $GOPATH.
• $ git clone https://android.googlesource.com/platform/tools/gpu $GOPATH/src/android.googlesource.com/platform/tools/gpu
• $ go get android.googlesource.com/platform/tools/gpu/api/...
• You should now have $GOPATH/bin/apic. You might want to add $GOPATH/bin to your $PATH.

Generating code

To generate libvulkan/*_gen.*,

• $ cd libvulkan
• $ apic template ../api/vulkan.api code-generator.tmpl Similar for nulldrv/null_driver_gen.*.