Announcing iOS support

[Robert Osfield]

From Iconiq Labs (https://www.iconiqlabs.com), a software company located in València (Spain), with long and happy experience with OpenSceneGraph,

we are happy to announce that we've managed to support and run VulkanSceneGraph in iOS. Here is a picture of VSG running the LZ sample model on an iPhone 8.

We'd like to share our effort with the project and contribute to its success as we have a lot of faith with it. We've created the following PR's for the project management to consider this. We hope it is accepted and everyone enjoys this as much as we did developing it.

VulkanSceneGraph core:
https://github.com/vsg-dev/VulkanSceneGraph/pull/433

vsgExamples:
https://github.com/vsg-dev/vsgExamples/pull/143

We are aware that the code might need some pretty minor changes, but we believe it is mature enough and the heavy lifting is done so that it can be made public as it is.

Cheers,

Jaume Faus,

[Ranen Ghosh]

Are there any tips on how to install vulkan and build vsg for iOS support?

The MoltenVK README indicates that I should not use the VulkanSDK in this case, but instead source from the MoltenVK repository:
https://github.com/KhronosGroup/MoltenVK
If you are developing a Vulkan application for macOS, it is highly recommended that you use the Vulkan SDK and the MoltenVK library included in it.  … If you are developing a Vulkan application for iOS … you can use this document to learn how to build a MoltenVK runtime library from source code.

However after building the MoltenVK framework, I couldn't get cmake to complete successfully in VulkanSceneGraph.
For one thing, it required a Vulkan version > "1.2.162.0" but the MoltenVK version is an implementation of vulkan 1.1. Beyond that I couldn't find explicit_layer.d in the MoltenVK source tree, as referenced here
https://github.com/vsg-dev/VulkanSceneGraph/blob/master/INSTALL.md#detailed-instructions-for-setting-up-your-environment-and-building-for-macos

[Ranen Ghosh]

Please disregard.  I apologize - although I searched before I found this relevant info only after posting this question :(
https://github.com/KhronosGroup/MoltenVK/blob/master/Docs/MoltenVK_Runtime_UserGuide.md

[Jaume Faus]

Hi Ranen, I'd be very much interested in learning how did it go for you in iOS to see if there is anything that can be improved. Please, let us know about your experience.

Regards,
Jaume

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