PCG_RNG.h

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/* 
 * Copyright (c) 2025 Grzegorz Krug.
 * All Rights Reserved.
 */
 
#pragma once
 
#include "CoreMinimal.h"
 
#include "PCG_RNG.generated.h"
 

UCLASS(BlueprintType, Blueprintable)
class UPCG32_RNG : public UObject {
    GENERATED_BODY()
 
public:
    uint32_t next();
 
    UFUNCTION(BlueprintCallable, Category="RNG")
    void InitBP( int64 stateIn, int64 streamIn );
 
    UFUNCTION(BlueprintCallable, Category="RNG")
    void SetState( int64 stateIn ) { state = static_cast<uint64_t>(stateIn); };

    UFUNCTION(BlueprintCallable, Category="RNG")
    void SetStream( int64 streamIn ) { stream = static_cast<uint64_t>(streamIn); };

    UFUNCTION(BlueprintCallable, Category="RNG")
    double GetNextDouble();

    UFUNCTION(BlueprintCallable, Category="RNG")
    double GetCurrentDouble() const;

    UFUNCTION(BlueprintCallable, Category="RNG")
    int GetNextInt( int A, int B );

    UFUNCTION(BlueprintCallable, Category="RNG")
    int GetCurrentInt( int A, int B ) const;

    virtual void Serialize( FArchive& Ar ) override;
 
protected:
    uint64_t state = 0x853c49e6748fea9bULL;
    uint64_t stream = 0xda3e39cb94b95bdbULL; // must be odd
    uint32_t last = -1;
};