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Build Instructions

  1. Requirements
  2. Building Overview
  3. Generated source code
  4. Dependencies
  5. Linux Build
  6. Windows Build
  7. MacOS build
  8. Android Build
  9. Installed Files

Requirements

  1. CMake >= 3.17.2
  2. C++17 compatible toolchain
  3. Git
  4. Python >= 3.10

NOTE: Python is needed for working on generated code, and helping grab dependencies. While it's not technically required, it's practically required for most users.

Building Overview

The following will be enough for most people, for more detailed instructions, see below.

git clone https://github.com/KhronosGroup/Vulkan-ExtensionLayer.git
cd Vulkan-ExtensionLayer

cmake -S . -B build -D UPDATE_DEPS=ON -D BUILD_WERROR=ON -D BUILD_TESTS=ON -D CMAKE_BUILD_TYPE=Debug
cmake --build build --config Debug

Warnings as errors off by default!

By default BUILD_WERROR is OFF. The idiom for open source projects is to NOT enable warnings as errors.

System/language package managers have to build on multiple different platforms and compilers.

By defaulting to ON we cause issues for package managers since there is no standard way to disable warnings until CMake 3.24

Add -D BUILD_WERROR=ON to your workflow. Or use the dev preset shown below which will also enabling warnings as errors.

Dependencies

Currently this repo has a custom process for grabbing C/C++ dependencies.

Keep in mind this repo predates tools like vcpkg, conan, etc. Our process is most similar to vcpkg.

By specifying -D UPDATE_DEPS=ON when configuring CMake we grab dependencies listed in known_good.json.

All we are doing is streamlining building/installing the known good dependencies and helping CMake find the dependencies.

This is done via a combination of Python and CMake scripting.

Misc Useful Information:

  • By default UPDATE_DEPS is OFF. The intent is to be friendly by default to system/language package managers.
  • You can run update_deps.py manually but it isn't recommended for most users.

How to test new dependency versions

Typically most developers alter known_good.json with the commit/branch they are testing.

Alternatively you can modify CMAKE_PREFIX_PATH as follows.

# Delete the CMakeCache.txt which will cache find_* results
rm build -rf/
cmake -S . -B build/ ... -D CMAKE_PREFIX_PATH=~/foobar/my_custom_glslang_install/ ...

Building On Linux

Linux Build Requirements

This repository is regularly built and tested on the two most recent Ubuntu LTS versions.

sudo apt-get install git build-essential python3 cmake

# Linux WSI system libraries
sudo apt-get install libwayland-dev xorg-dev

WSI Support Build Options

By default, the repository components are built with support for the Vulkan-defined WSI display servers: Xcb, Xlib, and Wayland. It is recommended to build the repository components with support for these display servers to maximize their usability across Linux platforms. If it is necessary to build these modules without support for one of the display servers, the appropriate CMake option of the form BUILD_WSI_xxx_SUPPORT can be set to OFF.

Linux 32-bit support

Usage of this repository's contents in 32-bit Linux environments is not officially supported. However, since this repository is supported on 32-bit Windows, these modules should generally work on 32-bit Linux.

Here are some notes for building 32-bit targets on a 64-bit Ubuntu "reference" platform:

# 32-bit libs
# your PKG_CONFIG configuration may be different, depending on your distribution
sudo apt-get install gcc-multilib g++-multilib libx11-dev:i386

Set up your environment for building 32-bit targets:

export ASFLAGS=--32
export CFLAGS=-m32
export CXXFLAGS=-m32
export PKG_CONFIG_LIBDIR=/usr/lib/i386-linux-gnu

Building On Windows

Windows Development Environment Requirements

  • Windows 10+
  • Visual Studio

Note: Anything less than Visual Studio 2019 is not guaranteed to compile/work.

Visual Studio Generator

Run CMake to generate Visual Studio project files.

# NOTE: By default CMake picks the latest version of Visual Studio as the default generator.
cmake -S . -B build --preset dev

# Open the Visual Studio solution
cmake --open build

See the CMake documentation for further information on Visual Studio generators.

NOTE: Windows developers don't have to develop in Visual Studio. Visual Studio just helps streamlining the needed C++ toolchain requirements (compilers, linker, etc).

Building on MacOS

MacOS Development Environment Requirements

  • Xcode

NOTE: MacOS developers don't have to develop in Xcode. Xcode just helps streamlining the needed C++ toolchain requirements (compilers, linker, etc). Similar to Visual Studio on Windows.

Xcode Generator

To create and open an Xcode project:

# Create the Xcode project
cmake -S . -B build -G Xcode --preset dev

# Open the Xcode project
cmake --open build

See the CMake documentation for further information on the Xcode generator.

Building For Android

  • CMake 3.21+
  • NDK r25+
  • Ninja 1.10+
  • Android SDK Build-Tools 34.0.0+

Android Build Requirements

  • Download Android Studio
  • Install (https://developer.android.com/studio/install)
  • From the Welcome to Android Studio splash screen, add the following components using the SDK Manager:
    • SDK Platforms > Android 8.0 and newer (API Level 26 or higher)
    • SDK Tools > Android SDK Build-Tools
    • SDK Tools > Android SDK Platform-Tools
    • SDK Tools > Android SDK Tools
    • SDK Tools > NDK
    • SDK Tools > CMake

Add Android specifics to environment

NOTE: The following commands are streamlined for Linux but easily transferable to other platforms. The main intent is setting 2 environment variables and ensuring the NDK and build tools are in the PATH.

# Set environment variables
# https://github.com/actions/runner-images/blob/main/images/linux/Ubuntu2204-Readme.md#environment-variables-2
export ANDROID_SDK_ROOT=$HOME/Android/Sdk
export ANDROID_NDK_HOME=$ANDROID_SDK_ROOT/ndk/X.Y.Z

# Modify path
export PATH=$ANDROID_SDK_ROOT/build-tools/X.Y.Z:$PATH

# (Optional if you have new enough version of CMake + Ninja)
export PATH=$ANDROID_SDK_ROOT/cmake/3.22.1/bin:$PATH

# Verify SDK build-tools is set correctly
which aapt

# Verify CMake/Ninja are in the path
which cmake
which ninja

# Check apksigner
apksigner --help

Note: If apksigner gives a java: not found error you do not have Java in your path.

# A common way to install on the system
sudo apt install default-jre

Android Build

  1. Building libraries to package with your APK

Invoking CMake directly to build the binary is relatively simple.

See https://developer.android.com/ndk/guides/cmake#command-line for CMake NDK documentation.

# Build release binary for arm64-v8a
cmake -S . -B build \
  -D CMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_HOME/build/cmake/android.toolchain.cmake \
  -D ANDROID_PLATFORM=26 \
  -D CMAKE_ANDROID_ARCH_ABI=arm64-v8a \
  -D CMAKE_ANDROID_STL_TYPE=c++_static \
  -D ANDROID_USE_LEGACY_TOOLCHAIN_FILE=NO \
  -D CMAKE_BUILD_TYPE=Release \
  -D UPDATE_DEPS=ON \
  -G Ninja

cmake --build build

cmake --install build --prefix build/install

Then you just package the library into your APK under the appropriate lib directory based on the ABI: https://en.wikipedia.org/wiki/Apk_(file_format)#Package_contents

Alternatively users can also use scripts/android.py to build the binaries.

Note: scripts/android.py will place the binaries in the build-android/libs directory.

# Build release binary for arm64-v8a
python3 scripts/android.py --config Release --app-abi arm64-v8a --app-stl c++_static

android.py can also streamline building for multiple ABIs:

# Build release binaries for all ABIs
python3 scripts/android.py --config Release --app-abi 'armeabi-v7a arm64-v8a x86 x86_64' --app-stl c++_static
  1. Building the test APK for development purposes

Creating the test APK is a bit of an involved process since it requires running multiple CLI tools after the CMake build has finished.

As a result users are enouraged to use scripts/android.py to build the test APK.

This script handles wrapping CMake and various Android CLI tools to create the APK for you.

# Build a complete test APK with debug binaries for all ABIS
python3 scripts/android.py --config Debug --app-abi 'armeabi-v7a arm64-v8a x86 x86_64' --app-stl c++_shared --apk --tests

# Build a clean test APK with release binaries for arm64-v8a
python3 scripts/android.py --config Release --app-abi arm64-v8a --app-stl c++_shared --apk --tests --clean

Note: scripts/android.py will place the APK in the build-android/bin directory.

CMake Installed Files

The installation depends on the target platform

For UNIX operating systems:

  • install_dir/lib : The extension layer binaries
  • install_dir/share/vulkan/explicit_layer.d : The corresponding json manifest files

NOTE: Android doesn't use json manifests for Vulkan layers.

For WIN32:

  • install_dir/bin : The extension layer binaries
  • install_dir/bin : The corresponding json manifest files

Software Installation

After you have built your project you can install using CMake's install functionality.

CMake Docs:

# EX: Installs Release artifacts into `build/install` directory.
# NOTE: --config is only needed for multi-config generators (Visual Studio, Xcode, etc)
cmake --install build/ --config Release --prefix build/install