spv.fragmentDensity.vert
ERROR: 0:10: 'gl_FragSizeEXT' : undeclared identifier 
ERROR: 0:10: 'assign' :  cannot convert from ' temp float' to 'layout( location=0) smooth out highp 2-component vector of uint'
ERROR: 0:11: 'gl_FragInvocationCountEXT' : undeclared identifier 
ERROR: 0:11: 'assign' :  cannot convert from ' temp float' to 'layout( location=2) smooth out highp int'
ERROR: 4 compilation errors.  No code generated.


SPIR-V is not generated for failed compile or link
