Nabla/include/nbl/builtin/glsl/utils/morton.glsl at c353ab3247444fc8fd3cc53a6e97b353c868e5a2 · Devsh-Graphics-Programming/Nabla · GitHub

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// Copyright (C) 2018-2020 - DevSH Graphics Programming Sp. z O.O.
// This file is part of the "Nabla Engine".
// For conditions of distribution and use, see copyright notice in nabla.h

#ifndef _NBL_BUILTIN_GLSL_UTILS_MORTON_INCLUDED_
#define _NBL_BUILTIN_GLSL_UTILS_MORTON_INCLUDED_

uint nbl_glsl_morton_decode2d4bComponent(in uint x)
{
    x &= 0x55555555u;
    x = (x ^ (x >>  1u)) & 0x33333333u;
    x = (x ^ (x >>  2u)) & 0x0f0f0f0fu;
    return x;
}

uint nbl_glsl_morton_decode2d8bComponent(in uint x)
{
    x &= 0x55555555u;
    x = (x ^ (x >>  1u)) & 0x33333333u;
    x = (x ^ (x >>  2u)) & 0x0f0f0f0fu;
    x = (x ^ (x >>  4u)) & 0x00ff00ffu;
    return x;
}

uint nbl_glsl_morton_decode2d32bComponent(in uint x)
{
    x &= 0x55555555u;
    x = (x ^ (x >>  1u)) & 0x33333333u;
    x = (x ^ (x >>  2u)) & 0x0f0f0f0fu;
    x = (x ^ (x >>  4u)) & 0x00ff00ffu;
    x = (x ^ (x >>  8u)) & 0x0000ffffu;
    x = (x ^ (x >>  16u));
    return x;
}


uvec2 nbl_glsl_morton_decode2d4b(in uint x)
{
    return uvec2(nbl_glsl_morton_decode2d4bComponent(x), nbl_glsl_morton_decode2d4bComponent(x >> 1u));
}

uvec2 nbl_glsl_morton_decode2d8b(in uint x)
{
    return uvec2(nbl_glsl_morton_decode2d8bComponent(x), nbl_glsl_morton_decode2d8bComponent(x >> 1u));
}

uvec2 nbl_glsl_morton_decode2d32b(in uint x)
{
    return uvec2(nbl_glsl_morton_decode2d32bComponent(x), nbl_glsl_morton_decode2d32bComponent(x >> 1u));
}

#endif