Forwarding to the list.
Am 28.03.2011 20:47, schrieb David Laight:
Ints and floats are represented differently and so, if we want to put
an integer array into floating point registers, we need to have casts.
If you were to simply call SetFloatArray, you would get nonsense
values in the floating point registers.
Even using casts will fall foul of the C aliasing rules - which
mean that the compiler can assume that a read of type will not be
modified by a write to a different type so can be reorderd (unless
one of the types is 'char').
Not only that, but there are systems that will fault is an invalid
FP bit pattern is loaded into an FP register.
David
My example wasn't very well chosen. So conversation (casts) between the
different types is necessary. It was meant the way to reuse some of the
code. Because I think ID3DXConstantTable_SetIntArray and
ID3DXConstantTable_SetFloatArray could share a lot of code. This will
probably be the same for ID3DXConstantTable_SetBoolArray.
Cheers
Rico
