Vulkan Sample

Steps to set up:

1. Install SDL2 with Homebrew: brew install sdl2
2. We need Swift 5 for this, so download a snapshot from Swift.org. Install the .pkg file.
3. Download Vulkan/MoltenVK from here and unzip to $HOME/SDKs. Example: $HOME/SDKs/vulkansdk-macos-1.1.92.1
4. Set up variables in ~/.bash_profile:

# use downloaded Swift 5 snapshot
export TOOLCHAINS="swift" 

# vulkan configuration
export VULKAN_SDK="$HOME/SDKs/vulkansdk-macos-1.1.92.1/macOS" # make sure this matches the downloaded version
export VK_LAYER_PATH="$VULKAN_SDK/etc/vulkan/explicit_layer.d"
export VK_ICD_FILENAMES="$VULKAN_SDK/etc/vulkan/icd.d/MoltenVK_icd.json"

# pkg-config
export CUSTOM_PKG_CONFIG="$HOME/pkg-config"
export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:$CUSTOM_PKG_CONFIG"

5. After the changes above are in place (source ~/.bash_profile to be sure), create vulkan.pc by running this:

mkdir -p $CUSTOM_PKG_CONFIG # make sure this exists
cat > $CUSTOM_PKG_CONFIG/vulkan.pc << EOF
prefix=$VULKAN_SDK
libdir=\${prefix}/lib
includedir=\${prefix}/include

Name: vulkan
Description: Vulkan SDK
Version: 1.0.69
Libs: -L\${libdir} -lvulkan
Cflags: -I\${includedir}
EOF

# if you have a better way of doing this, let me know
ln -s $VULKAN_SDK/lib/libvulkan.1.dylib /usr/local/lib 
ln -s $VULKAN_SDK/lib/libMoltenVK.dylib /usr/local/lib

6. Confirm right Swift version by running swift --version. Should return something like Apple Swift version 5.0-dev
7. Run swift build at the project's root folder