D3D11_CPU_ACCESS_FLAG enumeration

Defined in: d3d11.h
Namespace: Microsoft::WRL::Details (though typically used directly in C/C++ code)
Platform: Windows

The D3D11_CPU_ACCESS_FLAG enumeration specifies CPU access for a resource.

These flags are used in the D3D11_RESOURCE_MISC_FLAG member of the D3D11_BUFFER_DESC and D3D11_TEXTURE1D_DESC, D3D11_TEXTURE2D_DESC, D3D11_TEXTURE3D_DESC structures.

Syntax

                        enum D3D11_CPU_ACCESS_FLAG : unsigned int {
    D3D11_CPU_ACCESS_WRITE = 0,
    D3D11_CPU_ACCESS_READ = 1,
    D3D11_CPU_ACCESS_READ_WRITE = 2
};
                    

Members

D3D11_CPU_ACCESS_WRITE

The resource can be written to by the CPU.

D3D11_CPU_ACCESS_READ

The resource can be read from by the CPU.

D3D11_CPU_ACCESS_READ_WRITE

The resource can be read from and written to by the CPU.

Remarks

Resources that are accessible by the CPU are typically placed in system memory rather than video memory. This can lead to performance implications due to potential data transfers between system and video memory.

For optimal performance, minimize CPU access to resources and favor GPU access.

Requirements

                        
                                    Component
                                    Version
                                
                                    Minimum supported client
                                    Windows 7 [desktop apps | UWP apps]
                                
                                    Minimum supported server
                                    Windows Server 2008 R2 [desktop apps | UWP apps]
                                
                                    Header
                                    d3d11.h

Component	Version
Minimum supported client	Windows 7 [desktop apps \| UWP apps]
Minimum supported server	Windows Server 2008 R2 [desktop apps \| UWP apps]
Header	`d3d11.h`