PrimitiveTriangleIndicesEXT array size not matching OutputPrimitivesEXT

[sjfricke]

@pmistryNV for the VUID

VUID-PrimitiveTriangleIndicesEXT-PrimitiveTriangleIndicesEXT-07058
The size of the array decorated with PrimitiveTriangleIndicesEXT must match the value specified by OutputPrimitivesEXT

If I have a GLSL shader such as

#version 460
#extension GL_EXT_mesh_shader : enable
layout(max_vertices = 1) out;
layout(max_primitives = 2) out;
layout(triangles) out;
void main()
{
    gl_PrimitiveTriangleIndicesEXT[0] = uvec3(1, 1, 1);
}

I get

OpExecutionMode %main OutputPrimitivesEXT 2
OpDecorate %var BuiltIn PrimitiveTriangleIndicesEXT
%v3uint = OpTypeVector %uint 3
%uint_6 = OpConstant %uint 6
%array = OpTypeArray %v3uint %uint_6
%ptr = OpTypePointer Output %array
%var = OpVariable %ptr Output

So not sure if this is a Spec ambiguity or Glslang bug, but for array size I would expect OpTypeArray to be only 2 and not 6

[pmistryNV]

Let me have a look at it. Thanks for pointing it out. It's probably a glslang bug.