GLSL > MSL imageAtomicAdd error

[remoe]

Version: 1.0.26

This GLSL code:

...
layout(binding = 15, r32ui) uniform uimageBuffer gLightsCounter;
...
uint _449 = imageAtomicAdd(gLightsCounter, 0, 1u);

generates wrong MSL code:

uint _449 = atomic_fetch_add_explicit((volatile thread atomic_uint*)&(gLightsCounter, 0), 1u, memory_order_relaxed);

The error:

[MoltenVK ERROR] VK_ERROR_INITIALIZATION_FAILED: Shader library compile failed (error code 3):
Compilation failed:

program_source:170:87: warning: expression result unused
uint _449 = atomic_fetch_add_explicit((volatile thread atomic_uint*)&(gLightsCounter, 0), 1u, memory_order_relaxed);
^~~~~~~~~~~~~~
program_source:170:85: error: cannot take the address of an rvalue of type 'int'
uint _449 = atomic_fetch_add_explicit((volatile thread atomic_uint*)&(gLightsCounter, 0), 1u, memory_order_relaxed);
^ ~~~~~~~~~~~~~~~~~

[cdavis5e]

There is no "right" code for this, because Metal doesn't support this. This is known to Apple (rdar://41859236); dunno when it'll be fixed.

[cdavis5e]

But when it is fixed in Metal, we'll still be generating incorrect code for this. But that's an issue with SPIRV-Cross, which MoltenVK uses to handle shader modules.

[billhollings]

Is there anything to be done on this issue for now...or can we close it?