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MGLKitSampleApp_ios9.0 crashes on launch on device running iOS 10.x #61

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mb12 opened this issue Jun 18, 2021 · 6 comments
Open

MGLKitSampleApp_ios9.0 crashes on launch on device running iOS 10.x #61

mb12 opened this issue Jun 18, 2021 · 6 comments
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@mb12
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mb12 commented Jun 18, 2021

ERR: initialize(609): ANGLE Display::initialize error 12289: Could not create the EAGL context.
ERR: initialize(609): ANGLE Display::initialize error 12289: Could not create the EAGL context.
INFO: insertMessage(462): EGL CRITICAL: eglInitialize: Could not create the EAGL context.
(lldb) bt
@kakashidinho
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kakashidinho commented Jun 20, 2021 •
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I don't have iOS 10.x devices but I tried to run on simulator, and couldn't reproduce this issue (at least with current master branch).

@mb12
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mb12 commented Jun 20, 2021

It doesn't crash on the emulator for me either.
Could it be a 32-bit (armv7) vs 64-bit (arm64 issue)?
The device I am running it on is 32 bit.

@kakashidinho
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kakashidinho commented Jun 21, 2021 •
edited

Based on your posted log messages. It seems the process failed at this line:

metalangle/src/libANGLE/renderer/gl/eagl/DisplayEAGL.mm

Line 91 in 4ccacad

return egl::EglNotInitialized() << "Could not create the EAGL context.";

Which means mContext = [[EAGLContext alloc] initWithAPI:kGLESAPI]; failed. It's probably due to the phone's hardware doesn't support native OpenGL ES 3 (iPhone 5 and below).
This is the current limitation of MetalANGLE. On older devices, I fall back to use native OpenGL ES backend, but that back-end is not maintained by me. My main focus is Metal backend. OpenGL ES backend was maintained by upstream ANGLE and from what I know, they still support OpenGL ES 3.0+ hardwares only.

I don't think iPhone 5 and below have much market share currently. So they are low priorities in the support list.

@mb12
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mb12 commented Jun 21, 2021

Thank you very much. Your analysis is correct. Once I made these changes it works.

//constexpr EAGLRenderingAPI kGLESAPI = kEAGLRenderingAPIOpenGLES3;
constexpr EAGLRenderingAPI kGLESAPI = kEAGLRenderingAPIOpenGLES2;

@Berstanio
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I have a bit similar issue. But in my case I can run the sample (and any other app) on real devices flawless but I can't run them in any simulator. I get the following output which is a bit different to the one of this issue, but has the same eglError code: https://gist.github.com/Berstanio/81708a6431d0bcda2145143591062eec

//constexpr EAGLRenderingAPI kGLESAPI = kEAGLRenderingAPIOpenGLES3;
constexpr EAGLRenderingAPI kGLESAPI = kEAGLRenderingAPIOpenGLES2;

This change didn't fixed the issue.

I don't exactly know how the ios simulator works but a idea of mine was, that this could be related to the fact, that I run macos in a vm. Could this produce the issue? And if this is the case, is there any way to fix this?

@kakashidinho
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@Berstanio macos in a vm doesn't support metal, so it failed to create a metal device:

MTLCreateSystemDefaultDevice() zero devices

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@kakashidinho @mb12 @Berstanio