ref_vfcallback_getCPUFlags - shekh/VirtualDub2 GitHub Wiki

VirtualDub Plugin SDK 1.2

getCPUFlags video filter callback

getCPUFlags

Queries the host for enabled CPU-specific optimizations.

long __cdecl getCPUFlags();

Thread safety

This method is not thread-safe.

Exceptions

This function must not throw exceptions (see Except()).

Return value

A bitfield indicating which CPU extensions are active:

CPUF_SUPPORTS_CPUID	The CPU supports the CPUID instruction.
CPUF_SUPPORTS_FPU	Optimizations using the x87 floating-point unit (FPU) are enabled.
CPUF_SUPPORTS_MMX	MMX is enabled.
CPUF_SUPPORTS_ISSE	The integer portion of Streaming SIMD Extensions (SSE) is enabled. This is the portion of SSE also supported by the original Athlon, including shufw, pinsrw, pextrw, pavgb, pavgw, pmulhuw, movntq, maskmovq, prefetcht0, prefetcht1, prefetcht2, prefetchnta, and sfence.
CPUF_SUPPORTS_SSE	Streaming SIMD Extensions (SSE) is available, including floating-point vector instructions.
CPUF_SUPPORTS_SSE2	Streaming SIMD Extensions 2 (SSE2) is available, including 128-bit integer vector instructions.
CPUF_SUPPORTS_3DNOW	3DNow! is available, including 64-bit floating-point instructions.
CPUF_SUPPORTS_3DNOW_EXT	3DNow! Professional is available.

Remarks

This function returns the set of currently enabled CPU extensions, which is not always the same as the available extensions. Usually these will be the same, but it is possible for the user to override the enabled CPU extensions.

The enabled set can change between calls. If this is a problem, the value should be cached appropriately.