mirror of
https://github.com/1dot13/source.git
synced 2026-07-29 13:52:17 +02:00
SpaceViking
e1a56677f4
git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@2788 3b4a5df2-a311-0410-b5c6-a8a6f20db521
95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
#ifndef __RANDOM_
|
|
#define __RANDOM_
|
|
|
|
#include "Types.h"
|
|
#include "Debug.h"
|
|
#include <stdlib.h>
|
|
|
|
//IMPORTANT: Changing this define will invalidate the JA2 save. If this
|
|
// is necessary, please ifdef your own value.
|
|
#define MAX_PREGENERATED_NUMS 256
|
|
|
|
extern UINT32 guiPreRandomIndex;
|
|
extern std::vector<UINT32> guiPreRandomNums;
|
|
|
|
extern void InitializeRandom(void);
|
|
|
|
|
|
// WDS 04/20/2009 -- Random functions were moved to inline functions here in the header file
|
|
// to speed up the whole program a bit.
|
|
|
|
|
|
// Returns a pseudo-random unsigned integer between 0 and uiRange-1 inclusive.
|
|
// NOTE THE -1! So if you call Random(100) the numbers returned will
|
|
// be between 0 and 99 inclusive.
|
|
inline UINT32 Random(UINT32 uiRange)
|
|
{
|
|
// Always return 0, if no range given (it's not an error)
|
|
if (uiRange == 0)
|
|
return(0);
|
|
return rand() * uiRange / RAND_MAX % uiRange;
|
|
}
|
|
|
|
|
|
// Returns a pseudo-random integer between 0 and uiRange-1
|
|
inline INT32 iRandom(UINT32 uiRange)
|
|
{
|
|
// Always return 0, if no range given (it's not an error)
|
|
if (uiRange == 0)
|
|
return(0);
|
|
return rand() * uiRange / RAND_MAX % uiRange;
|
|
}
|
|
|
|
|
|
//Chance( 74 ) returns TRUE 74% of the time. If uiChance >= 100, then it will always return TRUE.
|
|
inline BOOLEAN Chance( UINT32 uiChance )
|
|
{
|
|
//AssertLE(uiChance, 100);
|
|
// lalien: since uiChance calculation is based on different values it can happen that uiChance is > than 100%
|
|
// It's not critical because uiChance >= 100 will always return TRUE. No need to crash the entire game.
|
|
// Make sure that uiChance value is not < than 0, or it can switch to positive
|
|
return (BOOLEAN)(Random( 100 ) < uiChance);
|
|
}
|
|
|
|
|
|
//Returns a pregenerated random number.
|
|
//Used to deter Ian's tactic of shoot, miss, restore saved game :)
|
|
inline UINT32 PreRandom( UINT32 uiRange )
|
|
{
|
|
UINT32 uiNum;
|
|
if( uiRange == 0 )
|
|
return 0;
|
|
//Extract the current pregenerated number
|
|
uiNum = guiPreRandomNums[ guiPreRandomIndex ] * uiRange / RAND_MAX % uiRange;
|
|
|
|
//Go to the next index.
|
|
guiPreRandomIndex++;
|
|
|
|
// Reload the random numbers even so often
|
|
if (guiPreRandomIndex == MAX_PREGENERATED_NUMS / 2) {
|
|
// [0..(MAX_PREGENERATED_NUMS/2) -1]
|
|
for( unsigned idx = 0; idx < MAX_PREGENERATED_NUMS / 2; ++idx ) {
|
|
guiPreRandomNums[ idx ] = rand();
|
|
}
|
|
} else if (guiPreRandomIndex >= (UINT32)MAX_PREGENERATED_NUMS ) {
|
|
// [MAX_PREGENERATED_NUMS/2 .. MAX_PREGENERATED_NUMS-1]
|
|
for( unsigned idx = MAX_PREGENERATED_NUMS / 2; idx < MAX_PREGENERATED_NUMS; ++idx ) {
|
|
guiPreRandomNums[ idx ] = rand();
|
|
}
|
|
guiPreRandomIndex = 0;
|
|
}
|
|
return uiNum;
|
|
}
|
|
|
|
inline BOOLEAN PreChance( UINT32 uiChance )
|
|
{
|
|
//AssertLE(uiChance, 100);
|
|
// lalien: since uiChance calculation is based on different values it can happen that uiChance is > than 100%
|
|
// It's not critical because uiChance >= 100 will always return TRUE. No need to crash the entire game.
|
|
// Make sure that uiChance value is not < than 0, or it can switch to positive
|
|
|
|
return (BOOLEAN)(PreRandom( 100 ) < uiChance);
|
|
}
|
|
|
|
|
|
#endif |