int32 GenerateBodyIndex(FRandomStream& InRandomStream) const
{
check(ValidBodies.Num() > 0);
return InRandomStream.GetUnsignedInt() % ValidBodies.Num();
}
bool FTripleBufferTest::RunTest(const FString& Parameters)
{
// uninitialized buffer
{
TTripleBuffer<int32> Buffer(NoInit);
TestFalse(TEXT("Uninitialized triple buffer must not be dirty"), Buffer.IsDirty());
}
// initialized buffer
{
TTripleBuffer<int32> Buffer(1);
TestFalse(TEXT("Initialized triple buffer must not be dirty"), Buffer.IsDirty());
TestEqual(TEXT("Initialized triple buffer must have correct read buffer value"), Buffer.Read(), 1);
Buffer.SwapReadBuffers();
TestEqual(TEXT("Initialized triple buffer must have correct temp buffer value"), Buffer.Read(), 1);
Buffer.SwapWriteBuffers();
TestTrue(TEXT("Write buffer swap must set dirty flag"), Buffer.IsDirty());
Buffer.SwapReadBuffers();
TestFalse(TEXT("Read buffer swap must clear dirty flag"), Buffer.IsDirty());
TestEqual(TEXT("Initialized triple buffer must have correct temp buffer value"), Buffer.Read(), 1);
}
// pre-set buffer
{
int32 Array[3] = { 1, 2, 3 };
TTripleBuffer<int32> Buffer(Array);
int32 Read = Buffer.Read();
TestEqual(TEXT("Pre-set triple buffer must have correct Read buffer value"), Read, 3);
Buffer.SwapReadBuffers();
int32 Temp = Buffer.Read();
TestEqual(TEXT("Pre-set triple buffer must have correct Temp buffer value"), Temp, 1);
Buffer.SwapWriteBuffers();
Buffer.SwapReadBuffers();
int32 Write = Buffer.Read();
TestEqual(TEXT("Pre-set triple buffer must have correct Write buffer value"), Write, 2);
}
// operations
{
TTripleBuffer<int32> Buffer;
for (int32 Index = 0; Index < 6; ++Index)
{
int32& Write = Buffer.GetWriteBuffer(); Write = Index; Buffer.SwapWriteBuffers();
Buffer.SwapReadBuffers();
TestEqual(*FString::Printf(TEXT("Triple buffer must read correct value (%i)"), Index), Buffer.Read(), Index);
}
FRandomStream Rand;
int32 LastRead = -1;
for (int32 Index = 0; Index < 100; ++Index)
{
int32 Writes = Rand.GetUnsignedInt() % 4;
while (Writes > 0)
{
int32& Write = Buffer.GetWriteBuffer(); Write = Index; Buffer.SwapWriteBuffers();
--Writes;
}
int32 Reads = Rand.GetUnsignedInt() % 4;
while (Reads > 0)
{
if (!Buffer.IsDirty())
{
break;
}
Buffer.SwapReadBuffers();
int32 Read = Buffer.Read();
TestTrue(TEXT("Triple buffer must read in increasing order"), Read > LastRead);
LastRead = Read;
--Reads;
}
}
}
return true;
}
