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Adding details about installing the SDK for macOS (#1026)

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Josh Catt 2018-08-27 23:42:28 +12:00 committed by Lucas Kent
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README.md
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@ -54,9 +54,25 @@ a Vulkan implementation on top of Apple's Metal API. This allows vulkano to buil
and iOS platforms.
The easiest way to get vulkano up and running on macOS is to install the
[Vulkan SDK for macOS](https://vulkan.lunarg.com/sdk/home). Vulkano will by default, as it does on
other platforms, look for `libvulkan.1.dylib` (included as part of the SDK). Note that it is still
possible to link with the MoltenVK framework (as vulkano did in previous versions) by adding the
[Vulkan SDK for macOS](https://vulkan.lunarg.com/sdk/home). To install the SDK so that
Vulkano will find it and dynamically link with `libvulkan.dylib`:
1. Download the latest macOS release and unpack it somewhere, for the next step
we'll assume that's `~/vulkan_sdk`.
2. Modify your environment to contain the SDK bin directory in PATH and the SDK lib directory in
DYLD_LIBRARY_PATH. We also need to set VK_ICD_FILENAMES and VK_LAYER_PATH. When using the Bash
shell, which is the default for macOS, it's easiest to do this by appending the following to the
`~/.bash_profile` file and then restarting the terminal.
```sh
export VULKAN_SDK=$HOME/vulkan_sdk/macOS
export PATH=$VULKAN_SDK/bin:$PATH
export DYLD_LIBRARY_PATH=$VULKAN_SDK/lib:$DYLD_LIBRARY_PATH
export VK_ICD_FILENAMES=$VULKAN_SDK/etc/vulkan/icd.d/MoltenVK_icd.json
export VK_LAYER_PATH=$VULKAN_SDK/etc/vulkan/explicit_layer.d
```
It is also possible to link with the MoltenVK framework (as vulkano did in previous versions) by adding the
appropriate cargo output lines to your build script and implementing your own
`vulkano::instance::loader::Loader` that calls the MoltenVK `vkGetInstanceProcAddr` implementation.