Incorrectly drawn sphere (day 12+) due to stride

[afdreher]

I really appreciate you putting together a metal tutorial. It's been a nice refresher coming from the OpenGL ES world.

I had an issue with the sphere not drawing correctly (Day 12 and beyond). For me the bottom part of the sphere was missing, and a black wedge appeared instead. I tracked down the issue to the line:

vertexDescriptor.bufferLayouts[0].stride = 24

On my play machine (old iMac with AMD Radeon R9 M295X), the issue is the size of the stride through the buffers. The issue is solved by using the layout size instead.

vertexDescriptor.bufferLayouts[0].stride = MemoryLayout<simd_float3>.size * 2