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More fixes for signed InternalSample()

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This commit is contained in:
Brian Fiete 2022-01-09 22:00:35 -05:00
parent 9c138399fc
commit 4df78e944f
1 changed files with 10 additions and 7 deletions
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17
BeefLibs/corlib/src/Random.bf
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@ -103,7 +103,7 @@ namespace System
{ {
//Including this division at the end gives us significantly improved //Including this division at the end gives us significantly improved
//random number distribution. //random number distribution.
return (InternalSample() * (1.0 / MBIG)); return ((InternalSample() & Int32.MaxValue) * (1.0 / Int32.MaxValue));
} }
private int32 InternalSample() private int32 InternalSample()
@ -136,7 +136,7 @@ namespace System
==============================================================================*/ ==============================================================================*/
public virtual int32 NextI32() public virtual int32 NextI32()
{ {
return InternalSample() & 0x7FFFFFFF; return InternalSample() & Int32.MaxValue;
} }
public virtual int32 NextS32() public virtual int32 NextS32()
@ -144,14 +144,19 @@ namespace System
return InternalSample(); return InternalSample();
} }
public virtual uint32 NextU32()
{
return (.)InternalSample();
}
public virtual int64 NextI64() public virtual int64 NextI64()
{ {
return (((int64)InternalSample() << 32) | InternalSample()) & 0x7FFFFFFF'FFFFFFFFL; return (int64)(((uint64)InternalSample() << 32) | (uint64)InternalSample()) & 0x7FFFFFFF'FFFFFFFFL;
} }
public virtual int64 NextS64() public virtual int64 NextS64()
{ {
return (((int64)InternalSample() << 32) | InternalSample()); return (int64)(((uint64)InternalSample() << 32) | (uint64)InternalSample());
} }
private double GetSampleForLargeRange() private double GetSampleForLargeRange()
@ -257,10 +262,9 @@ namespace System
public virtual double NextDoubleSigned() public virtual double NextDoubleSigned()
{ {
return (InternalSample() * (2.0 / MBIG)) - 1.0; return (InternalSample() * (1.0 / MBIG));
} }
/*==================================NextBytes=================================== /*==================================NextBytes===================================
**Action: Fills the byte array with random bytes [0..0x7f]. The entire array is filled. **Action: Fills the byte array with random bytes [0..0x7f]. The entire array is filled.
**Returns:Void **Returns:Void
@ -270,7 +274,6 @@ namespace System
public virtual void NextBytes(uint8[] buffer) public virtual void NextBytes(uint8[] buffer)
{ {
if (buffer == null) Runtime.FatalError(); if (buffer == null) Runtime.FatalError();
Contract.EndContractBlock();
for (int32 i = 0; i < buffer.Count; i++) for (int32 i = 0; i < buffer.Count; i++)
{ {
buffer[i] = (uint8)(InternalSample() % ((int32)UInt8.MaxValue + 1)); buffer[i] = (uint8)(InternalSample() % ((int32)UInt8.MaxValue + 1));