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(svn r26171) -Codechange: Make TemporaryStorageArray keep track of assigned registers. Also make clearing the array 'cheaper'.

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frosch 2013-12-23 18:07:57 +00:00
parent 8860bb5c8d
commit 71e2ca5822
1 changed files with 18 additions and 2 deletions
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20
src/newgrf_storage.h
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@ -135,11 +135,15 @@ struct PersistentStorageArray : BaseStorageArray {
template <typename TYPE, uint SIZE>
struct TemporaryStorageArray : BaseStorageArray {
TYPE storage[SIZE]; ///< Memory to for the storage array
uint16 init[SIZE]; ///< Storage has been assigned, if this equals 'init_key'.
uint16 init_key; ///< Magic key to 'init'.
/** Simply construct the array */
TemporaryStorageArray()
{
memset(this->storage, 0, sizeof(this->storage));
memset(this->storage, 0, sizeof(this->storage)); // not exactly needed, but makes code analysers happy
memset(this->init, 0, sizeof(this->init));
this->init_key = 1;
}
/**
@ -153,6 +157,7 @@ struct TemporaryStorageArray : BaseStorageArray {
if (pos >= SIZE) return;
this->storage[pos] = value;
this->init[pos] = this->init_key;
AddChangedStorage(this);
}
@ -166,12 +171,23 @@ struct TemporaryStorageArray : BaseStorageArray {
/* Out of the scope of the array */
if (pos >= SIZE) return 0;
if (this->init[pos] != this->init_key) {
/* Unassigned since last call to ClearChanges */
return 0;
}
return this->storage[pos];
}
void ClearChanges(bool keep_changes)
{
memset(this->storage, 0, sizeof(this->storage));
/* Increment init_key to invalidate all storage */
this->init_key++;
if (this->init_key == 0) {
/* When init_key wraps around, we need to reset everything */
memset(this->init, 0, sizeof(this->init));
this->init_key = 1;
}
}
};