(svn r12004) -Codechange: refactor the random functions to reduce code duplication.

This commit is contained in:
rubidium 2008-01-29 00:27:25 +00:00
parent fde33b5547
commit 3b2145aafe
6 changed files with 61 additions and 40 deletions

View File

@ -6,20 +6,26 @@
#include "random_func.hpp"
#include "bitmath_func.hpp"
uint32 _random_seeds[2][2];
Randomizer _random, _interactive_random;
uint32 InteractiveRandom()
uint32 Randomizer::Next()
{
const uint32 s = _random_seeds[1][0];
const uint32 t = _random_seeds[1][1];
const uint32 s = this->state[0];
const uint32 t = this->state[1];
_random_seeds[1][0] = s + ROR(t ^ 0x1234567F, 7) + 1;
return _random_seeds[1][1] = ROR(s, 3) - 1;
this->state[0] = s + ROR(t ^ 0x1234567F, 7) + 1;
return this->state[1] = ROR(s, 3) - 1;
}
uint InteractiveRandomRange(uint max)
uint32 Randomizer::Next(uint16 max)
{
return GB(InteractiveRandom(), 0, 16) * max >> 16;
return GB(this->Next(), 0, 16) * max >> 16;
}
void Randomizer::SetSeed(uint32 seed)
{
this->state[0] = seed;
this->state[1] = seed;
}
#ifdef MERSENNE_TWISTER
@ -119,28 +125,21 @@ uint32 Random()
#else /* MERSENNE_TWISTER */
void SetRandomSeed(uint32 seed)
{
_random_seeds[0][0] = seed;
_random_seeds[0][1] = seed;
_random_seeds[1][0] = seed * 0x1234567;
_random_seeds[1][1] = _random_seeds[1][0];
_random.SetSeed(seed);
_interactive_random.SetSeed(seed * 0x1234567);
}
#ifdef RANDOM_DEBUG
#include "../network/network_data.h"
uint32 DoRandom(int line, const char *file)
{
if (_networking && (DEREF_CLIENT(0)->status != STATUS_INACTIVE || !_network_server))
if (_networking && (DEREF_CLIENT(0)->status != STATUS_INACTIVE || !_network_server)) {
printf("Random [%d/%d] %s:%d\n",_frame_counter, (byte)_current_player, file, line);
#else /* RANDOM_DEBUG */
uint32 Random()
{
#endif /* RANDOM_DEBUG */
const uint32 s = _random_seeds[0][0];
const uint32 t = _random_seeds[0][1];
}
_random_seeds[0][0] = s + ROR(t ^ 0x1234567F, 7) + 1;
return _random_seeds[0][1] = ROR(s, 3) - 1;
return _random->Next()
}
#endif /* RANDOM_DEBUG */
#endif /* MERSENNE_TWISTER */
#if defined(RANDOM_DEBUG) && !defined(MERSENNE_TWISTER)
@ -148,9 +147,4 @@ uint DoRandomRange(uint max, int line, const char *file)
{
return GB(DoRandom(line, file), 0, 16) * max >> 16;
}
#else /* RANDOM_DEBUG & !MERSENNE_TWISTER */
uint RandomRange(uint max)
{
return GB(Random(), 0, 16) * max >> 16;
}
#endif /* RANDOM_DEBUG & !MERSENNE_TWISTER */

View File

@ -27,6 +27,35 @@
// Doesn't work with network yet.
// #define MERSENNE_TWISTER
/**
* Structure to encapsulate the pseudo random number generators.
*/
struct Randomizer {
/** The state of the randomizer */
uint32 state[2];
/**
* Generate the next pseudo random number
* @return the random number
*/
uint32 Next();
/**
* Generate the next pseudo random number scaled to max
* @param max the maximum value of the returned random number
* @return the random number
*/
uint32 Next(uint16 max);
/**
* (Re)set the state of the random number generator.
* @param seed the new state
*/
void SetSeed(uint32 seed);
};
extern Randomizer _random; ///< Random used in the game state calculations
extern Randomizer _interactive_random; ///< Random used every else where is does not (directly) influence the game state
void SetRandomSeed(uint32 seed);
#ifdef RANDOM_DEBUG
#define Random() DoRandom(__LINE__, __FILE__)
@ -34,12 +63,12 @@ void SetRandomSeed(uint32 seed);
#define RandomRange(max) DoRandomRange(max, __LINE__, __FILE__)
uint DoRandomRange(uint max, int line, const char *file);
#else
uint32 Random();
uint RandomRange(uint max);
static inline uint32 Random() { return _random.Next(); }
static inline uint32 RandomRange(uint16 max) { return _random.Next(max); }
#endif
uint32 InteractiveRandom(); // Used for random sequences that are not the same on the other end of the multiplayer link
uint InteractiveRandomRange(uint max);
static inline uint32 InteractiveRandom() { return _interactive_random.Next(); }
static inline uint32 InteractiveRandomRange(uint16 max) { return _interactive_random.Next(max); }
/**
* Checks if a given randomize-number is below a given probability.
@ -100,6 +129,4 @@ static inline bool Chance16R(const uint a, const uint b, uint32 &r)
return Chance16I(a, b, r);
}
extern uint32 _random_seeds[2][2];
#endif /* RANDOM_FUNC_HPP */

View File

@ -90,7 +90,7 @@ static void *_GenerateWorld(void *arg)
if (_network_dedicated) DEBUG(net, 0, "Generating map, please wait...");
/* Set the Random() seed to generation_seed so we produce the same map with the same seed */
if (_patches.generation_seed == GENERATE_NEW_SEED) _patches.generation_seed = _patches_newgame.generation_seed = InteractiveRandom();
_random_seeds[0][0] = _random_seeds[0][1] = _patches.generation_seed;
_random.SetSeed(_patches.generation_seed);
SetGeneratingWorldProgress(GWP_MAP_INIT, 2);
SetObjectToPlace(SPR_CURSOR_ZZZ, PAL_NONE, VHM_NONE, WC_MAIN_WINDOW, 0);

View File

@ -205,8 +205,8 @@ static const SaveLoadGlobVarList _date_desc[] = {
SLEG_CONDVAR(_cur_tileloop_tile, SLE_UINT32, 6, SL_MAX_VERSION),
SLEG_VAR(_disaster_delay, SLE_UINT16),
SLEG_VAR(_station_tick_ctr, SLE_UINT16),
SLEG_VAR(_random_seeds[0][0], SLE_UINT32),
SLEG_VAR(_random_seeds[0][1], SLE_UINT32),
SLEG_VAR(_random.state[0], SLE_UINT32),
SLEG_VAR(_random.state[1], SLE_UINT32),
SLEG_CONDVAR(_cur_town_ctr, SLE_FILE_U8 | SLE_VAR_U32, 0, 9),
SLEG_CONDVAR(_cur_town_ctr, SLE_UINT32, 10, SL_MAX_VERSION),
SLEG_VAR(_cur_player_tick_index, SLE_FILE_U8 | SLE_VAR_U32),

View File

@ -1235,9 +1235,9 @@ static bool NetworkDoClientLoop()
if (_sync_frame != 0) {
if (_sync_frame == _frame_counter) {
#ifdef NETWORK_SEND_DOUBLE_SEED
if (_sync_seed_1 != _random_seeds[0][0] || _sync_seed_2 != _random_seeds[0][1]) {
if (_sync_seed_1 != _random.state[0] || _sync_seed_2 != _random.state[1]) {
#else
if (_sync_seed_1 != _random_seeds[0][0]) {
if (_sync_seed_1 != _random.state[0]) {
#endif
NetworkError(STR_NETWORK_ERR_DESYNC);
DebugDumpCommands("ddc:serr:%d;%d\n", _date, _date_fract);
@ -1332,9 +1332,9 @@ void NetworkGameLoop()
// Then we make the frame
StateGameLoop();
_sync_seed_1 = _random_seeds[0][0];
_sync_seed_1 = _random.state[0];
#ifdef NETWORK_SEND_DOUBLE_SEED
_sync_seed_2 = _random_seeds[0][1];
_sync_seed_2 = _random.state[1];
#endif
NetworkServer_Tick(send_frame);

View File

@ -1456,7 +1456,7 @@ static const OldChunks main_chunk[] = {
OCL_VAR ( OC_FILE_U16 | OC_VAR_U32, 1, &_date ),
OCL_VAR ( OC_UINT16, 1, &_date_fract ),
OCL_NULL( 600 ), ///< TextEffects
OCL_VAR ( OC_UINT32, 2, &_random_seeds[0] ),
OCL_VAR ( OC_UINT32, 2, &_random.state ),
OCL_ASSERT( 0x264 ),
OCL_CHUNK( 70, LoadOldTown ),