[PATCH 2/5] wined3d: Wrap resource->heapMemory into a structure

[Stefan Dösinger]

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Am 2013-08-19 17:08, schrieb Stefan Dösinger:
> I'm not entirely sure about the SIZE_T align = RESOURCE_ALIGNMENT -
> 1 + sizeof(*p); line though. Msvcrt doesn't have the - 1, and
> allocating size + RESOURCE_ALIGNMENT bytes might be enough. msvcrt
> allocates the equivalent of size + RESOURCE_ALIGNMENT + sizeof(void
> *).
After going through all the possibilities I concluded that size +
alignment + sizeof(void *) - 1 is the smallest allocation size. The
worst case is a pointer of the form n * alignment - sizeof(void *) -
1. In this case we need sizeof(void *) - 1 bytes to get to the next
aligned address and then alignment bytes to store our real alloc pointer.

Not sure why msvcrt allocates one extra byte. Probably because
allocations below 4 or 8 bytes don't matter anyway.
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