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Installation instructions using Vulkan SDK < 1.1.92.0

Prior to version 1.1.92.0, the Vulkan SDK was not available as an Ubunutu package. Setting up a working development environment was slightly more cumbersome, and setting up dependencies for Island required some extra steps, which are documented here if only for nostalgia.

Legacy Vulkan SDK installation instructions

What follows is a step-by-step guide for setting up a working Vulkan SDK under Ubuntu 18.0 and prior.

Download Vulkan SDK from the LunarG web site

Recommended SDK local folder structure

We recommend to extract this and future Vulkan SDK archives into a shared top-level folder so that you can recreate the following structure:

VulkanSDK/
    1.1.73.0/
    1.1.77.0/
    @current -> 1.1.77.0

Note that the folder has a symlink, current, which points at the very latest version of the Vulkan SDK. This way, upgrading the SDK becomes trivial.

Make Vulkan SDK environment variables visible

Current linux distributions of the Vulkan SDK include a file named setup-env.sh. This file needs to be sourced into your shell on startup.

Ubuntu 18.0

To source setup-env.sh, add the following line to your ~/.profile:

`source ~/Documents/VulkanSDK/current/setup-env.sh`

This assumes you have created the VulkanSDK top level folder in ~/Documents. If not, update the path to setup-env.sh accordingly. Note that we're using the symlink current mentioned above, so that we're always sourcing the current SDK.

Then add a library search path entry for SDK libs:

sudo echo echo "$VULKAN_SDK/lib" > /etc/ld.so.conf.d/vk.conf

Rebuild the library search cache

ldconfig

You should then see the correct library paths for the SDK validation layers, if you issue:

ldconfig -p | grep libVk

Unfortunately ubuntu won't let setup-env.sh update the system-wide library search paths, LD_LIBRARY_PATH, which is why we have to jump through this hoop.

Build Vulkan SDK Tools

Unfortunately, we can't use the binary shaderC distribution straight from the SDK, as it was not compiled with the build flags we need for Island. Not a big deal, we have to set our own build flags and recompile the library:

Move to the current Vulkan SDK directory, and edit build_tools.sh

In method buildShaderc() change the build type so that it says:

`-DCMAKE_BUILD_TYPE=Release ..`

This is so that the build does not create a 400MB leviathan of a debug symbol laden library, but a lean, 12MB release version. Note that building SDK tools creates both static and dynamic version of the shaderC library, but only adds a link to the static version of the library to the artifacts folder. Let this build create a symlink to the dynamic version of the shaderc library. For this, below the line:

ln -sf "$PWD"/libshaderc/libshaderc_combined.a "${LIBDIR}"/libshaderc

add the line:

ln -sf "$PWD"/libshaderc/libshaderc_shared.so "${LIBDIR}"/libshaderc

Save & close build_tools.sh, then build the SDK tools:

./build_tools.sh