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// Copyright 2009 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "OSPConfig.h"
#include "common/FeatureFlagsEnum.h"
#include "common/World.ih"
#include "rkcommon/math/vec.ih"
OSPRAY_BEGIN_ISPC_NAMESPACE
SYCL_EXTERNAL float computeAO(const Renderer *uniform,
const World *uniform,
const varying DifferentialGeometry &,
const uniform int sampleCnt,
const uniform float aoRadius,
const varying vec3i &sampleID,
const uniform FeatureFlagsHandler &ff);
// TODO should use PDEP
inline uniform uint32 partitionZOrder(uniform uint32 n)
{
n &= 0x0000FFFF;
n = (n | (n << 8)) & 0x00FF00FF;
n = (n | (n << 4)) & 0x0F0F0F0F;
n = (n | (n << 2)) & 0x33333333;
n = (n | (n << 1)) & 0x55555555;
return n;
}
inline uint32 partitionZOrder8(uint32 n)
{
n &= 0x000000FF;
n = (n | (n << 4)) & 0x0F0F0F0F;
n = (n | (n << 2)) & 0x33333333;
n = (n | (n << 1)) & 0x55555555;
return n;
}
// TODO should use PEXT
inline uniform uint32 unpartitionZOrder(uniform uint32 n)
{
n &= 0x55555555;
n = (n ^ (n >> 1)) & 0x33333333;
n = (n ^ (n >> 2)) & 0x0F0F0F0F;
n = (n ^ (n >> 4)) & 0x00FF00FF;
n = (n ^ (n >> 8)) & 0x0000FFFF;
return n;
}
inline uniform uint32 interleaveZOrder(uniform uint32 x, uniform uint32 y)
{
return partitionZOrder(x) | (partitionZOrder(y) << 1);
}
inline uint32 interleaveZOrder16(uint32 x, uint32 y)
{
return partitionZOrder8(x) | (partitionZOrder8(y) << 1);
}
inline void deinterleaveZOrder(
uniform uint32 z, uniform uint32 *uniform x, uniform uint32 *uniform y)
{
assert(x);
assert(y);
*x = *y = 0;
*x = unpartitionZOrder(z);
*y = unpartitionZOrder(z >> 1);
}
OSPRAY_END_ISPC_NAMESPACE
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