Method integerCheck

glslang/MachineIndependent/ParseHelper.cpp:4244–4253

Both test, and if necessary spit out an error, to see if the node is really a 32-bit integer or can implicitly convert to one.

// a 32-bit integer or can implicitly convert to one.
//
void TParseContext::integerCheck(const TIntermTyped* node, const char* token)
{
    auto from_type = node->getBasicType();
    if ((from_type == EbtInt || from_type == EbtUint ||
         intermediate.canImplicitlyPromote(from_type, EbtInt, EOpNull) ||
         intermediate.canImplicitlyPromote(from_type, EbtUint, EOpNull)) && node->isScalar())
        return;

    error(node->getLoc(), "scalar integer expression required", token, "");
}

//
// Both test, and if necessary spit out an error, to see if the node is really