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Primitive

Primitives added in GrLibrary are defined as void function(GrCall).

void myPrimitive(GrCall call) {

}

Input parameters

A primitive fetches its parameters with get functions from GrCall, the index matches the order of the parameters.

void myPrimitive(GrCall call) {
    call.getInt(0) + call.getInt(1);
}

Output parameters

Sams as get functions, we returns values with set functions from GrCall. We are to call those the same order as its output parameters.

void myPrimitive(GrCall call) {
    call.setInt(12);
}

Parameters' types

We can dynamically know the type of the parameters with getInType and getOutType. Those parameters are in a mangled form (use grUnmangle to obtain a GrType).

void myPrimitive(GrCall call) {
    call.getInType(0);
    call.getOutType(0);
}

Error handling

In case of error, we call raise. It's recommanded to exit the primitive and to not do any operation after raise.

void myPrimitive(GrCall call) {
    if(call.isNull(0)) {
        call.raise("Error");
        return;
    }
}