D3DDDI_COPY_FLAGS - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// d3dumddi.h

typedef enum D3DDDI_COPY_FLAGS {
  D3DDDI_COPY_NO_OVERWRITE,
  D3DDDI_COPY_DISCARD
} ;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ne-d3dumddi-d3dddi_copy_flags)

D3DDDI_COPY_FLAGS enumeration

Description

Specifies how to handle the existing contents of a resource during a copy or update operation of a region within that resource.

Constants

D3DDDI_COPY_NO_OVERWRITE

The caller guarantees that the portion of the surface that is being written to with new data is not currently being referenced or accessed by any previous render operation. The driver can take advantage of this capability to optimize performance and memory usage.

D3DDDI_COPY_DISCARD

The user-mode display driver can discard previous contents of the entire resource. The driver can take advantage of this capability to optimize performance and memory usage.

View the official Windows Driver Kit DDI reference

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