Wikitude

I downloaded the Wikitude_Unity_8-7-0_8-7-0_2019_08_13_03_15_42 Wikitude_Unity_8-7-0_8-7-0_2019_08_13_03_15_42 sample project. I successfully built and ran this version for iOS using Unity 2019.2.11f1 and Xcode 11.2, with Mac OS X 10.14.6 Mojave. I am building to Apple devices that are running some flavor of iOS 13 typically,

I tried switching the Graphics API from Metal to OpenGLES3. However, when building the example projects, I get a linking error - 

Undefined symbols for architecture arm64:

  "_OBJC_CLASS_$_MTLRenderPassDescriptor", referenced from:

      objc-class-ref in libUnityiOSBridge.a(libUnityiOSBridge.a-arm64-master.o)

ld: symbol(s) not found for architecture arm64

 Is it possible to use OpenGLES3 with Wikitude on iOS?

For my Wikitude project I would like to build it for OpenGLES3 rather than Metal, as my shaders do not work properly when built to Metal. When I build my own project to IOS and OpenGLES, I do not get the linking error above, and all the interactions work as expected. However, I find that the camera view when built to OpenGLES3 appears as a solid light grey color (the camera view is not displayed) and I receive a repeated OpenGL error each frame:

Failed to create framebuffer. OpenGL error 0x0000 occured

If it is the 8.7 version of Wikitude that is causing the incompatibility with OpenGLES3, I will contact you about upgrading or purchasing a new license. Thanks.

Hi

Thanks for this info. I added Metal as a dependency of the libUnityiOSBridge library. This allowed me to build the 8.7 Wikitude example projects using the OpenGLES3 rendering library.

However, now the camera view is also a light grey color in the example project. And I am also receiving the same OpenGL error each frame -

Failed to create framebuffer. OpenGL error 0x0000 occured

 I have attached a screen grab to show the grey camera, in case this helps.

Hi Alexandru

Thanks for confirming that. I wasn't sure if it wasn't just some build setting that I was forgetting.

The shaders that we are using also compile to OpenGLES2. But when building to OpenGLES2 I find that that there is a similar issue - the camera screen is pink or magenta instead of grey.

I will work today to see if I can get my shaders to compile to Metal as a workaround.

Thanks

I wanted to let you know that I did get my shaders to compile to Metal for this project, and I will be able to use Metal. There is a bug in the current Unity shader compiler when compiling to metal (https://issuetracker.unity3d.com/issues/ios?page=1#comments) but a workaround is to use the Shader Compiler for the 2019.3.x version (still in beta). I found that this solution worked for me.