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majcostaandGitHub
381ab936eb
* rename 'Standard Gaming Platform' to 'sgp' * Adapt CMakeLists.txt files to renamed SGP directory * Lowercase it
144 lines
4.1 KiB
C++
144 lines
4.1 KiB
C++
#ifndef __RANDOM_
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#define __RANDOM_
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#define BMP_RANDOM
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#include "Types.h"
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#include "Debug.h"
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#include "GameSettings.h"
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//IMPORTANT: Changing this define will invalidate the JA2 save. If this is necessary, please ifdef your own value.
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#define MAX_PREGENERATED_NUMS 256
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#ifdef BMP_RANDOM//dnl ch55 111009 !!!Do not undefine this if plan play Big maps, old random generator not work properly and return only 2^15 different values although seems that should return all posible INT32 values
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extern UINT32 guiPreRandomIndex;
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extern UINT32 guiPreRandomNums[MAX_PREGENERATED_NUMS];
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extern void InitializeRandom(void);
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extern UINT32 GetRndNum(UINT32 maxnum);
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extern bool gfMPDebugOutputRandoms;
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UINT32 NewRandom(UINT32 max);
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extern GAME_EXTERNAL_OPTIONS gGameExternalOptions;
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inline UINT32 Random(UINT32 uiRange)
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{
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if (gGameExternalOptions.fNewRandom)
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return NewRandom(uiRange);
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else
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return GetRndNum(uiRange);
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}
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/*inline INT32 iRandom(UINT32 uiRange)
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{
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return(GetRndNum(uiRange));
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}*/
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inline BOOLEAN Chance( UINT32 uiChance )
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{
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return((BOOLEAN)(Random(100) < uiChance));
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}
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inline UINT32 PreRandom(UINT32 uiRange)
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{
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return Random(uiRange);
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//return(GetRndNum(uiRange));
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}
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inline BOOLEAN PreChance( UINT32 uiChance )
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{
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return((BOOLEAN)(PreRandom(100) < uiChance));
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}
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#else
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#include <stdlib.h>
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extern UINT32 guiPreRandomIndex;
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extern std::vector<UINT32> guiPreRandomNums;
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extern void InitializeRandom(void);
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// WDS 04/20/2009 -- Random functions were moved to inline functions here in the header file
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// to speed up the whole program a bit.
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// Returns a pseudo-random unsigned integer between 0 and uiRange-1 inclusive.
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// NOTE THE -1! So if you call Random(100) the numbers returned will
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// be between 0 and 99 inclusive.
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inline UINT32 Random(UINT32 uiRange)
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{
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// Always return 0, if no range given (it's not an error)
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if (uiRange == 0)
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return(0);
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return rand() * uiRange / RAND_MAX % uiRange;
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}
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// Returns a pseudo-random integer between 0 and uiRange-1
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/*inline INT32 iRandom(UINT32 uiRange)
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{
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// Always return 0, if no range given (it's not an error)
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if (uiRange == 0)
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return(0);
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return rand() * uiRange / RAND_MAX % uiRange;
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}*/
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//Chance( 74 ) returns TRUE 74% of the time. If uiChance >= 100, then it will always return TRUE.
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inline BOOLEAN Chance( UINT32 uiChance )
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{
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//AssertLE(uiChance, 100);
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// lalien: since uiChance calculation is based on different values it can happen that uiChance is > than 100%
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// It's not critical because uiChance >= 100 will always return TRUE. No need to crash the entire game.
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// Make sure that uiChance value is not < than 0, or it can switch to positive
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return (BOOLEAN)(Random( 100 ) < uiChance);
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}
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//Returns a pregenerated random number.
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//Used to deter Ian's tactic of shoot, miss, restore saved game :)
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inline UINT32 PreRandom( UINT32 uiRange )
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{
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UINT32 uiNum;
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if( uiRange == 0 )
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return 0;
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//Extract the current pregenerated number
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uiNum = guiPreRandomNums[ guiPreRandomIndex ] * uiRange / RAND_MAX % uiRange;
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//Go to the next index.
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guiPreRandomIndex++;
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// Reload the random numbers even so often
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if (guiPreRandomIndex == MAX_PREGENERATED_NUMS / 2) {
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// [0..(MAX_PREGENERATED_NUMS/2) -1]
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for( unsigned idx = 0; idx < MAX_PREGENERATED_NUMS / 2; ++idx ) {
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guiPreRandomNums[ idx ] = rand();
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}
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} else if (guiPreRandomIndex >= (UINT32)MAX_PREGENERATED_NUMS ) {
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// [MAX_PREGENERATED_NUMS/2 .. MAX_PREGENERATED_NUMS-1]
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for( unsigned idx = MAX_PREGENERATED_NUMS / 2; idx < MAX_PREGENERATED_NUMS; ++idx ) {
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guiPreRandomNums[ idx ] = rand();
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}
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guiPreRandomIndex = 0;
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}
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return uiNum;
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}
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inline BOOLEAN PreChance( UINT32 uiChance )
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{
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//AssertLE(uiChance, 100);
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// lalien: since uiChance calculation is based on different values it can happen that uiChance is > than 100%
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// It's not critical because uiChance >= 100 will always return TRUE. No need to crash the entire game.
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// Make sure that uiChance value is not < than 0, or it can switch to positive
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return (BOOLEAN)(PreRandom( 100 ) < uiChance);
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}
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#endif
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#endif
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