1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/* $Id$ */
/** @file newgrf_storage.h Functionality related to the temporary and persistent storage arrays for NewGRFs. */
#ifndef NEWGRF_STORAGE_H
#define NEWGRF_STORAGE_H
#include "core/alloc_func.hpp"
/**
* Base class for all NewGRF storage arrays. Nothing fancy, only here
* so we have a generalised class to use.
*/
struct BaseStorageArray
{
/** The needed destructor */
virtual ~BaseStorageArray() {}
/**
* Clear the changes made since the last ClearChanges.
* This can be done in two ways:
* - saving the changes permanently
* - reverting to the previous version
* @param keep_changes do we save or revert the changes since the last ClearChanges?
*/
virtual void ClearChanges(bool keep_changes) = 0;
/**
* Stores some value at a given position.
* @param pos the position to write at
* @param value the value to write
*/
virtual void Store(uint pos, uint32 value) = 0;
};
/**
* Class for persistent storage of data.
* On ClearChanges that data is either reverted or saved.
* @param TYPE the type of variable to store.
* @param SIZE the size of the array.
*/
template <typename TYPE, uint SIZE>
struct PersistentStorageArray : BaseStorageArray {
TYPE storage[SIZE]; ///< Memory to for the storage array
TYPE *prev_storage; ///< Memory to store "old" states so we can revert them on the performance of test cases for commands etc.
/** Simply construct the array */
PersistentStorageArray() : prev_storage(NULL)
{
memset(this->storage, 0, sizeof(this->storage));
}
/** And free all data related to it */
~PersistentStorageArray()
{
free(this->prev_storage);
}
/**
* Stores some value at a given position.
* If there is no backup of the data that backup is made and then
* we write the data.
* @param pos the position to write at
* @param value the value to write
*/
void Store(uint pos, uint32 value)
{
/* Out of the scope of the array */
if (pos >= SIZE) return;
/* The value hasn't changed, so we pretend nothing happened.
* Saves a few cycles and such and it's pretty easy to check. */
if (this->storage[pos] == value) return;
/* We do not have made a backup; lets do so */
if (this->prev_storage != NULL) {
this->prev_storage = MallocT<TYPE>(SIZE);
memcpy(this->prev_storage, this->storage, sizeof(this->storage));
/* We only need to register ourselves when we made the backup
* as that is the only time something will have changed */
AddChangedStorage(this);
}
this->storage[pos] = value;
}
/**
* Gets the value from a given position.
* @param pos the position to get the data from
* @return the data from that position
*/
TYPE Get(uint pos) const
{
/* Out of the scope of the array */
if (pos >= SIZE) return 0;
return this->storage[pos];
}
void ClearChanges(bool keep_changes)
{
assert(this->prev_storage != NULL);
if (!keep_changes) {
memcpy(this->storage, this->prev_storage, sizeof(this->storage));
}
free(this->prev_storage);
}
};
/**
* Class for temporary storage of data.
* On ClearChanges that data is always zero-ed.
* @param TYPE the type of variable to store.
* @param SIZE the size of the array.
*/
template <typename TYPE, uint SIZE>
struct TemporaryStorageArray : BaseStorageArray {
TYPE storage[SIZE]; ///< Memory to for the storage array
/** Simply construct the array */
TemporaryStorageArray()
{
memset(this->storage, 0, sizeof(this->storage));
}
/**
* Stores some value at a given position.
* @param pos the position to write at
* @param value the value to write
*/
void Store(uint pos, uint32 value)
{
/* Out of the scope of the array */
if (pos >= SIZE) return;
this->storage[pos] = value;
AddChangedStorage(this);
}
/**
* Gets the value from a given position.
* @param pos the position to get the data from
* @return the data from that position
*/
TYPE Get(uint pos) const
{
/* Out of the scope of the array */
if (pos >= SIZE) return 0;
return this->storage[pos];
}
void ClearChanges(bool keep_changes)
{
memset(this->storage, 0, sizeof(this->storage));
}
};
/**
* Add the changed storage array to the list of changed arrays.
* This is done so we only have to revert/save the changed
* arrays, which saves quite a few clears, etc. after callbacks.
* @param storage the array that has changed
*/
void AddChangedStorage(BaseStorageArray *storage);
/**
* Clear the changes made since the last ClearStorageChanges.
* This is done for *all* storages that have been registered to with
* AddChangedStorage since the previous ClearStorageChanges.
*
* This can be done in two ways:
* - saving the changes permanently
* - reverting to the previous version
* @param keep_changes do we save or revert the changes since the last ClearChanges?
*/
void ClearStorageChanges(bool keep_changes);
#endif /* NEWGRF_STORAGE_H */
|
