bitfieldReverse
Keywords: bitfieldReverse, NVIDIA, NVIDIA Cg Toolkit, Cg Toolkit, Shader, Shader Programming, GPU Shader Programming, GPU Program

> ## Name

> bitfieldReverse - return the reversed bitfield.

> ## Synopsis

>     int  bitfieldReverse(int  x)
>     int2 bitfieldReverse(int2 x)
>     int3 bitfieldReverse(int3 x)
>     int4 bitfieldReverse(int4 x)

>     uint  bitfieldReverse(uint  x)
>     uint2 bitfieldReverse(uint2 x)
>     uint3 bitfieldReverse(uint3 x)
>     uint4 bitfieldReverse(uint4 x)

> ## Parameters

> x
>   Bitfield to reverse.

> ## Description

> Returns the reverse of the bitfield x.

> ## Reference Implementation

> bitfieldReverse for an int bitfield can be implemented like this:

>     int bitfieldReverse(int x)
>     {
>       int res = 0;
>       int i, shift, mask;

>       for(i = 0; i < 32; i++) {
>         mask = 1 << i;
>         shift = 32 - 2*i - 1;
>         mask &= x;
>         mask = (shift > 0) ? mask << shift : mask >> -shift;
>         res |= mask;
>       }

>       return res;
>     }

> ## Profile Support

> bitfieldReverse is supported in gp5 and hlsl11 profiles.

> ## See Also

>       http://www.opengl.org/registry/specs/ARB/gpu_shader5.txt

> bitfieldInsert, bitfieldExtract, bitCount, findLSB and findMSB