//
// Make sure there is enough data provided to the constructor to build
// something of the type of the constructor. Also returns the type of
// the constructor.
//
// Returns true if there was an error in construction.
//
bool TParseContext::constructorErrorCheck(int line, TIntermNode* node, TFunction& function, TOperator op, TType* type)
{
*type = function.getReturnType();
bool constructingMatrix = false;
switch(op) {
case EOpConstructMat2:
case EOpConstructMat3:
case EOpConstructMat4:
constructingMatrix = true;
break;
default:
break;
}
//
// Note: It's okay to have too many components available, but not okay to have unused
// arguments. 'full' will go to true when enough args have been seen. If we loop
// again, there is an extra argument, so 'overfull' will become true.
//
int size = 0;
bool constType = true;
bool full = false;
bool overFull = false;
bool matrixInMatrix = false;
bool arrayArg = false;
for (int i = 0; i < function.getParamCount(); ++i) {
const TParameter& param = function.getParam(i);
size += param.type->getObjectSize();
if (constructingMatrix && param.type->isMatrix())
matrixInMatrix = true;
if (full)
overFull = true;
if (op != EOpConstructStruct && !type->isArray() && size >= type->getObjectSize())
full = true;
if (param.type->getQualifier() != EvqConst)
constType = false;
if (param.type->isArray())
arrayArg = true;
}
if (constType)
type->setQualifier(EvqConst);
if (type->isArray() && type->getArraySize() != function.getParamCount()) {
error(line, "array constructor needs one argument per array element", "constructor", "");
return true;
}
if (arrayArg && op != EOpConstructStruct) {
error(line, "constructing from a non-dereferenced array", "constructor", "");
return true;
}
if (matrixInMatrix && !type->isArray()) {
if (function.getParamCount() != 1) {
error(line, "constructing matrix from matrix can only take one argument", "constructor", "");
return true;
}
}
if (overFull) {
error(line, "too many arguments", "constructor", "");
return true;
}
if (op == EOpConstructStruct && !type->isArray() && int(type->getStruct()->size()) != function.getParamCount()) {
error(line, "Number of constructor parameters does not match the number of structure fields", "constructor", "");
return true;
}
if (!type->isMatrix() || !matrixInMatrix) {
if ((op != EOpConstructStruct && size != 1 && size < type->getObjectSize()) ||
(op == EOpConstructStruct && size < type->getObjectSize())) {
error(line, "not enough data provided for construction", "constructor", "");
return true;
}
}
TIntermTyped *typed = node ? node->getAsTyped() : 0;
if (typed == 0) {
error(line, "constructor argument does not have a type", "constructor", "");
return true;
}
if (op != EOpConstructStruct && IsSampler(typed->getBasicType())) {
error(line, "cannot convert a sampler", "constructor", "");
return true;
}
if (typed->getBasicType() == EbtVoid) {
error(line, "cannot convert a void", "constructor", "");
return true;
}
return false;
}
