>> Unfortunately in 3.6 passing values by parameter is buggy,
>> it's fixed in the 3.7 beta, but in general you probably shouldn't
>> rely on values being returned correctly via parameter.
>>
> Just for curiosity sake, do you mean in general programming, or only in 
> SDL (and why)?
> 
> At the end, i read that a parameter (in programming) is just a variable 
> stored in the stack (and recovered later).

That depends on the programming language. In C, you'd have to pass a 
pointer.

void change_param(int* foo) {
     *foo=42;
}
...
int bar = 1;
change_param(&bar);

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