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vtk-m/vtkm/rendering/raytracing/BoundingVolumeHierarchy.cxx

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//============================================================================
// Copyright (c) Kitware, Inc.
// All rights reserved.
// See LICENSE.txt for details.
// This software is distributed WITHOUT ANY WARRANTY; without even
// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE. See the above copyright notice for more information.
//
// Copyright 2015 Sandia Corporation.
// Copyright 2015 UT-Battelle, LLC.
// Copyright 2015 Los Alamos National Security.
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
// Laboratory (LANL), the U.S. Government retains certain rights in
// this software.
//============================================================================
#include <math.h>
#include <vtkm/Math.h>
#include <vtkm/VectorAnalysis.h>
#include <vtkm/cont/DeviceAdapter.h>
#include <vtkm/cont/DeviceAdapterAlgorithm.h>
#include <vtkm/cont/RuntimeDeviceTracker.h>
#include <vtkm/cont/Timer.h>
#include <vtkm/cont/TryExecute.h>
#include <vtkm/exec/AtomicArray.h>
#include <vtkm/rendering/raytracing/BoundingVolumeHierarchy.h>
#include <vtkm/rendering/raytracing/Logger.h>
#include <vtkm/rendering/raytracing/MortonCodes.h>
#include <vtkm/rendering/raytracing/RayTracingTypeDefs.h>
#include <vtkm/rendering/raytracing/Worklets.h>
#include <vtkm/worklet/DispatcherMapField.h>
#include <vtkm/worklet/WorkletMapField.h>
#define AABB_EPSILON 0.00001f
namespace vtkm
{
namespace rendering
{
namespace raytracing
{
namespace detail
{
class LinearBVHBuilder
{
public:
class CountingIterator;
class FindAABBs;
template <typename Device>
class GatherFloat32;
template <typename Device>
class GatherVecCast;
class BVHData;
template <typename Device>
class PropagateAABBs;
template <typename Device>
class TreeBuilder;
VTKM_CONT
LinearBVHBuilder() {}
template <typename Device>
VTKM_CONT void SortAABBS(
BVHData& bvh,
vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>>& triangleIndices,
vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Int32, 4>>& outputTriangleIndices,
Device vtkmNotUsed(device));
template <typename Device>
VTKM_CONT void RunOnDevice(LinearBVH& linearBVH, Device device);
}; // class LinearBVHBuilder
class LinearBVHBuilder::CountingIterator : public vtkm::worklet::WorkletMapField
{
public:
VTKM_CONT
CountingIterator() {}
typedef void ControlSignature(FieldOut<>);
typedef void ExecutionSignature(WorkIndex, _1);
VTKM_EXEC
void operator()(const vtkm::Id& index, vtkm::Id& outId) const { outId = index; }
}; //class countingIterator
class LinearBVHBuilder::FindAABBs : public vtkm::worklet::WorkletMapField
{
public:
VTKM_CONT
FindAABBs() {}
typedef void ControlSignature(FieldIn<>,
FieldOut<>,
FieldOut<>,
FieldOut<>,
FieldOut<>,
FieldOut<>,
FieldOut<>,
WholeArrayIn<Vec3RenderingTypes>);
typedef void ExecutionSignature(_1, _2, _3, _4, _5, _6, _7, _8);
template <typename PointPortalType>
VTKM_EXEC void operator()(const vtkm::Vec<vtkm::Id, 4> indices,
vtkm::Float32& xmin,
vtkm::Float32& ymin,
vtkm::Float32& zmin,
vtkm::Float32& xmax,
vtkm::Float32& ymax,
vtkm::Float32& zmax,
const PointPortalType& points) const
{
// cast to Float32
vtkm::Vec<vtkm::Float32, 3> point;
point = static_cast<vtkm::Vec<vtkm::Float32, 3>>(points.Get(indices[1]));
xmin = point[0];
ymin = point[1];
zmin = point[2];
xmax = xmin;
ymax = ymin;
zmax = zmin;
point = static_cast<vtkm::Vec<vtkm::Float32, 3>>(points.Get(indices[2]));
xmin = vtkm::Min(xmin, point[0]);
ymin = vtkm::Min(ymin, point[1]);
zmin = vtkm::Min(zmin, point[2]);
xmax = vtkm::Max(xmax, point[0]);
ymax = vtkm::Max(ymax, point[1]);
zmax = vtkm::Max(zmax, point[2]);
point = static_cast<vtkm::Vec<vtkm::Float32, 3>>(points.Get(indices[3]));
xmin = vtkm::Min(xmin, point[0]);
ymin = vtkm::Min(ymin, point[1]);
zmin = vtkm::Min(zmin, point[2]);
xmax = vtkm::Max(xmax, point[0]);
ymax = vtkm::Max(ymax, point[1]);
zmax = vtkm::Max(zmax, point[2]);
vtkm::Float32 xEpsilon = (xmax - xmin) * AABB_EPSILON;
vtkm::Float32 yEpsilon = (ymax - ymin) * AABB_EPSILON;
vtkm::Float32 zEpsilon = (zmax - zmin) * AABB_EPSILON;
xmin -= xEpsilon;
ymin -= yEpsilon;
zmin -= zEpsilon;
xmax += xEpsilon;
ymax += yEpsilon;
zmax += zEpsilon;
}
}; //class FindAABBs
template <typename Device>
class LinearBVHBuilder::GatherFloat32 : public vtkm::worklet::WorkletMapField
{
private:
typedef typename vtkm::cont::ArrayHandle<vtkm::Float32> FloatArrayHandle;
typedef typename FloatArrayHandle::ExecutionTypes<Device>::PortalConst PortalConst;
typedef typename FloatArrayHandle::ExecutionTypes<Device>::Portal Portal;
PortalConst InputPortal;
Portal OutputPortal;
public:
VTKM_CONT
GatherFloat32(const FloatArrayHandle& inputPortal,
FloatArrayHandle& outputPortal,
const vtkm::Id& size)
: InputPortal(inputPortal.PrepareForInput(Device()))
{
this->OutputPortal = outputPortal.PrepareForOutput(size, Device());
}
typedef void ControlSignature(FieldIn<>);
typedef void ExecutionSignature(WorkIndex, _1);
VTKM_EXEC
void operator()(const vtkm::Id& outIndex, const vtkm::Id& inIndex) const
{
OutputPortal.Set(outIndex, InputPortal.Get(inIndex));
}
}; //class GatherFloat
template <typename Device>
class LinearBVHBuilder::GatherVecCast : public vtkm::worklet::WorkletMapField
{
private:
typedef typename vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>> Vec4IdArrayHandle;
typedef typename vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Int32, 4>> Vec4IntArrayHandle;
typedef typename Vec4IdArrayHandle::ExecutionTypes<Device>::PortalConst PortalConst;
typedef typename Vec4IntArrayHandle::ExecutionTypes<Device>::Portal Portal;
private:
PortalConst InputPortal;
Portal OutputPortal;
public:
VTKM_CONT
GatherVecCast(const Vec4IdArrayHandle& inputPortal,
Vec4IntArrayHandle& outputPortal,
const vtkm::Id& size)
: InputPortal(inputPortal.PrepareForInput(Device()))
{
this->OutputPortal = outputPortal.PrepareForOutput(size, Device());
}
typedef void ControlSignature(FieldIn<>);
typedef void ExecutionSignature(WorkIndex, _1);
VTKM_EXEC
void operator()(const vtkm::Id& outIndex, const vtkm::Id& inIndex) const
{
OutputPortal.Set(outIndex, InputPortal.Get(inIndex));
}
}; //class GatherVec3Id
class LinearBVHBuilder::BVHData
{
public:
//TODO: make private
vtkm::cont::ArrayHandle<vtkm::Float32>* xmins;
vtkm::cont::ArrayHandle<vtkm::Float32>* ymins;
vtkm::cont::ArrayHandle<vtkm::Float32>* zmins;
vtkm::cont::ArrayHandle<vtkm::Float32>* xmaxs;
vtkm::cont::ArrayHandle<vtkm::Float32>* ymaxs;
vtkm::cont::ArrayHandle<vtkm::Float32>* zmaxs;
vtkm::cont::ArrayHandle<vtkm::UInt32> mortonCodes;
vtkm::cont::ArrayHandle<vtkm::Id> parent;
vtkm::cont::ArrayHandle<vtkm::Id> leftChild;
vtkm::cont::ArrayHandle<vtkm::Id> rightChild;
template <typename Device>
VTKM_CONT BVHData(vtkm::Id numPrimitives, Device vtkmNotUsed(device))
: NumPrimitives(numPrimitives)
{
InnerNodeCount = NumPrimitives - 1;
vtkm::Id size = NumPrimitives + InnerNodeCount;
xmins = new vtkm::cont::ArrayHandle<vtkm::Float32>();
ymins = new vtkm::cont::ArrayHandle<vtkm::Float32>();
zmins = new vtkm::cont::ArrayHandle<vtkm::Float32>();
xmaxs = new vtkm::cont::ArrayHandle<vtkm::Float32>();
ymaxs = new vtkm::cont::ArrayHandle<vtkm::Float32>();
zmaxs = new vtkm::cont::ArrayHandle<vtkm::Float32>();
parent.PrepareForOutput(size, Device());
leftChild.PrepareForOutput(InnerNodeCount, Device());
rightChild.PrepareForOutput(InnerNodeCount, Device());
mortonCodes.PrepareForOutput(NumPrimitives, Device());
}
VTKM_CONT
~BVHData()
{
//
delete xmins;
delete ymins;
delete zmins;
delete xmaxs;
delete ymaxs;
delete zmaxs;
}
VTKM_CONT
vtkm::Id GetNumberOfPrimitives() const { return NumPrimitives; }
VTKM_CONT
vtkm::Id GetNumberOfInnerNodes() const { return InnerNodeCount; }
private:
vtkm::Id NumPrimitives;
vtkm::Id InnerNodeCount;
}; // class BVH
template <typename Device>
class LinearBVHBuilder::PropagateAABBs : public vtkm::worklet::WorkletMapField
{
private:
typedef typename vtkm::cont::ArrayHandle<vtkm::Id> IdArrayHandle;
typedef typename vtkm::cont::ArrayHandle<vtkm::Int8> Int8Handle;
typedef typename vtkm::cont::ArrayHandle<Vec<vtkm::Float32, 2>> Float2ArrayHandle;
typedef typename vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Int32, 2>> VecInt2Handle;
typedef typename vtkm::cont::ArrayHandle<Vec<vtkm::Float32, 4>> Float4ArrayHandle;
typedef typename IdArrayHandle::ExecutionTypes<Device>::PortalConst IdConstPortal;
typedef typename Float2ArrayHandle::ExecutionTypes<Device>::Portal Float2ArrayPortal;
typedef typename VecInt2Handle::ExecutionTypes<Device>::Portal Int2ArrayPortal;
typedef typename Int8Handle::ExecutionTypes<Device>::Portal Int8ArrayPortal;
typedef typename Float4ArrayHandle::ExecutionTypes<Device>::Portal Float4ArrayPortal;
Float4ArrayPortal FlatBVH;
IdConstPortal Parents;
IdConstPortal LeftChildren;
IdConstPortal RightChildren;
vtkm::Int32 LeafCount;
//Int8Handle Counters;
//Int8ArrayPortal CountersPortal;
vtkm::exec::AtomicArray<vtkm::Int32, Device> Counters;
public:
VTKM_CONT
PropagateAABBs(IdArrayHandle& parents,
IdArrayHandle& leftChildren,
IdArrayHandle& rightChildren,
vtkm::Int32 leafCount,
Float4ArrayHandle flatBVH,
const vtkm::exec::AtomicArray<vtkm::Int32, Device>& counters)
: Parents(parents.PrepareForInput(Device()))
, LeftChildren(leftChildren.PrepareForInput(Device()))
, RightChildren(rightChildren.PrepareForInput(Device()))
, LeafCount(leafCount)
, Counters(counters)
{
this->FlatBVH = flatBVH.PrepareForOutput((LeafCount - 1) * 4, Device());
}
typedef void ControlSignature(ExecObject,
ExecObject,
ExecObject,
ExecObject,
ExecObject,
ExecObject);
typedef void ExecutionSignature(WorkIndex, _1, _2, _3, _4, _5, _6);
template <typename StrorageType>
VTKM_EXEC_CONT void operator()(
const vtkm::Id workIndex,
const vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32, StrorageType>& xmin,
const vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32, StrorageType>& ymin,
const vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32, StrorageType>& zmin,
const vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32, StrorageType>& xmax,
const vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32, StrorageType>& ymax,
const vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32, StrorageType>& zmax) const
{
//move up into the inner nodes
vtkm::Id currentNode = LeafCount - 1 + workIndex;
vtkm::Vec<vtkm::Id, 2> childVector;
while (currentNode != 0)
{
currentNode = Parents.Get(currentNode);
vtkm::Int32 oldCount = Counters.Add(currentNode, 1);
if (oldCount == 0)
return;
vtkm::Id currentNodeOffset = currentNode * 4;
childVector[0] = LeftChildren.Get(currentNode);
childVector[1] = RightChildren.Get(currentNode);
if (childVector[0] > (LeafCount - 2))
{
childVector[0] = childVector[0] - LeafCount + 1;
vtkm::Vec<vtkm::Float32, 4>
first4Vec; // = FlatBVH.Get(currentNode); only this one needs effects this
first4Vec[0] = xmin.Get(childVector[0]);
first4Vec[1] = ymin.Get(childVector[0]);
first4Vec[2] = zmin.Get(childVector[0]);
first4Vec[3] = xmax.Get(childVector[0]);
FlatBVH.Set(currentNodeOffset, first4Vec);
vtkm::Vec<vtkm::Float32, 4> second4Vec = FlatBVH.Get(currentNodeOffset + 1);
second4Vec[0] = ymax.Get(childVector[0]);
second4Vec[1] = zmax.Get(childVector[0]);
FlatBVH.Set(currentNodeOffset + 1, second4Vec);
childVector[0] = -(childVector[0] + 1);
}
else
{
vtkm::Id child = childVector[0] * 4;
vtkm::Vec<vtkm::Float32, 4> cFirst4Vec = FlatBVH.Get(child);
vtkm::Vec<vtkm::Float32, 4> cSecond4Vec = FlatBVH.Get(child + 1);
vtkm::Vec<vtkm::Float32, 4> cThird4Vec = FlatBVH.Get(child + 2);
cFirst4Vec[0] = vtkm::Min(cFirst4Vec[0], cSecond4Vec[2]);
cFirst4Vec[1] = vtkm::Min(cFirst4Vec[1], cSecond4Vec[3]);
cFirst4Vec[2] = vtkm::Min(cFirst4Vec[2], cThird4Vec[0]);
cFirst4Vec[3] = vtkm::Max(cFirst4Vec[3], cThird4Vec[1]);
FlatBVH.Set(currentNodeOffset, cFirst4Vec);
vtkm::Vec<vtkm::Float32, 4> second4Vec = FlatBVH.Get(currentNodeOffset + 1);
second4Vec[0] = vtkm::Max(cSecond4Vec[0], cThird4Vec[2]);
second4Vec[1] = vtkm::Max(cSecond4Vec[1], cThird4Vec[3]);
FlatBVH.Set(currentNodeOffset + 1, second4Vec);
}
if (childVector[1] > (LeafCount - 2))
{
childVector[1] = childVector[1] - LeafCount + 1;
vtkm::Vec<vtkm::Float32, 4> second4Vec = FlatBVH.Get(currentNodeOffset + 1);
second4Vec[2] = xmin.Get(childVector[1]);
second4Vec[3] = ymin.Get(childVector[1]);
FlatBVH.Set(currentNodeOffset + 1, second4Vec);
vtkm::Vec<vtkm::Float32, 4> third4Vec;
third4Vec[0] = zmin.Get(childVector[1]);
third4Vec[1] = xmax.Get(childVector[1]);
third4Vec[2] = ymax.Get(childVector[1]);
third4Vec[3] = zmax.Get(childVector[1]);
FlatBVH.Set(currentNodeOffset + 2, third4Vec);
childVector[1] = -(childVector[1] + 1);
}
else
{
vtkm::Id child = childVector[1] * 4;
vtkm::Vec<vtkm::Float32, 4> cFirst4Vec = FlatBVH.Get(child);
vtkm::Vec<vtkm::Float32, 4> cSecond4Vec = FlatBVH.Get(child + 1);
vtkm::Vec<vtkm::Float32, 4> cThird4Vec = FlatBVH.Get(child + 2);
vtkm::Vec<vtkm::Float32, 4> second4Vec = FlatBVH.Get(currentNodeOffset + 1);
second4Vec[2] = vtkm::Min(cFirst4Vec[0], cSecond4Vec[2]);
second4Vec[3] = vtkm::Min(cFirst4Vec[1], cSecond4Vec[3]);
FlatBVH.Set(currentNodeOffset + 1, second4Vec);
cThird4Vec[0] = vtkm::Min(cFirst4Vec[2], cThird4Vec[0]);
cThird4Vec[1] = vtkm::Max(cFirst4Vec[3], cThird4Vec[1]);
cThird4Vec[2] = vtkm::Max(cSecond4Vec[0], cThird4Vec[2]);
cThird4Vec[3] = vtkm::Max(cSecond4Vec[1], cThird4Vec[3]);
FlatBVH.Set(currentNodeOffset + 2, cThird4Vec);
}
vtkm::Vec<vtkm::Float32, 4> fourth4Vec;
vtkm::Int32 leftChild =
static_cast<vtkm::Int32>((childVector[0] >= 0) ? childVector[0] * 4 : childVector[0]);
memcpy(&fourth4Vec[0], &leftChild, 4);
vtkm::Int32 rightChild =
static_cast<vtkm::Int32>((childVector[1] >= 0) ? childVector[1] * 4 : childVector[1]);
memcpy(&fourth4Vec[1], &rightChild, 4);
FlatBVH.Set(currentNodeOffset + 3, fourth4Vec);
}
}
}; //class PropagateAABBs
template <typename Device>
class LinearBVHBuilder::TreeBuilder : public vtkm::worklet::WorkletMapField
{
public:
typedef typename vtkm::cont::ArrayHandle<vtkm::UInt32> UIntArrayHandle;
typedef typename vtkm::cont::ArrayHandle<vtkm::Id> IdArrayHandle;
typedef typename UIntArrayHandle::ExecutionTypes<Device>::PortalConst UIntPortalType;
typedef typename IdArrayHandle::ExecutionTypes<Device>::Portal IdPortalType;
private:
UIntPortalType MortonCodePortal;
IdPortalType ParentPortal;
vtkm::Id LeafCount;
vtkm::Id InnerCount;
//TODO: get instrinsic support
VTKM_EXEC
inline vtkm::Int32 CountLeadingZeros(vtkm::UInt32& x) const
{
vtkm::UInt32 y;
vtkm::UInt32 n = 32;
y = x >> 16;
if (y != 0)
{
n = n - 16;
x = y;
}
y = x >> 8;
if (y != 0)
{
n = n - 8;
x = y;
}
y = x >> 4;
if (y != 0)
{
n = n - 4;
x = y;
}
y = x >> 2;
if (y != 0)
{
n = n - 2;
x = y;
}
y = x >> 1;
if (y != 0)
return vtkm::Int32(n - 2);
return vtkm::Int32(n - x);
}
// returns the count of largest shared prefix between
// two morton codes. Ties are broken by the indexes
// a and b.
//
// returns count of the largest binary prefix
VTKM_EXEC
inline vtkm::Int32 delta(const vtkm::Int32& a, const vtkm::Int32& b) const
{
bool tie = false;
bool outOfRange = (b < 0 || b > LeafCount - 1);
//still make the call but with a valid adderss
vtkm::Int32 bb = (outOfRange) ? 0 : b;
vtkm::UInt32 aCode = MortonCodePortal.Get(a);
vtkm::UInt32 bCode = MortonCodePortal.Get(bb);
//use xor to find where they differ
vtkm::UInt32 exOr = aCode ^ bCode;
tie = (exOr == 0);
//break the tie, a and b must always differ
exOr = tie ? vtkm::UInt32(a) ^ vtkm::UInt32(bb) : exOr;
vtkm::Int32 count = CountLeadingZeros(exOr);
if (tie)
count += 32;
count = (outOfRange) ? -1 : count;
return count;
}
public:
VTKM_CONT
TreeBuilder(const UIntArrayHandle& mortonCodesHandle,
IdArrayHandle& parentHandle,
const vtkm::Id& leafCount)
: MortonCodePortal(mortonCodesHandle.PrepareForInput(Device()))
, LeafCount(leafCount)
{
InnerCount = LeafCount - 1;
this->ParentPortal = parentHandle.PrepareForOutput(InnerCount + LeafCount, Device());
}
typedef void ControlSignature(FieldOut<>, FieldOut<>);
typedef void ExecutionSignature(WorkIndex, _1, _2);
VTKM_EXEC
void operator()(const vtkm::Id& index, vtkm::Id& leftChild, vtkm::Id& rightChild) const
{
vtkm::Int32 idx = vtkm::Int32(index);
//something = MortonCodePortal.Get(index) + 1;
//determine range direction
vtkm::Int32 d = 0 > (delta(idx, idx + 1) - delta(idx, idx - 1)) ? -1 : 1;
//find upper bound for the length of the range
vtkm::Int32 minDelta = delta(idx, idx - d);
vtkm::Int32 lMax = 2;
while (delta(idx, idx + lMax * d) > minDelta)
lMax *= 2;
//binary search to find the lower bound
vtkm::Int32 l = 0;
for (int t = lMax / 2; t >= 1; t /= 2)
{
if (delta(idx, idx + (l + t) * d) > minDelta)
l += t;
}
vtkm::Int32 j = idx + l * d;
vtkm::Int32 deltaNode = delta(idx, j);
vtkm::Int32 s = 0;
vtkm::Float32 divFactor = 2.f;
//find the split postition using a binary search
for (vtkm::Int32 t = (vtkm::Int32)ceil(vtkm::Float32(l) / divFactor);;
divFactor *= 2, t = (vtkm::Int32)ceil(vtkm::Float32(l) / divFactor))
{
if (delta(idx, idx + (s + t) * d) > deltaNode)
{
s += t;
}
if (t == 1)
break;
}
vtkm::Int32 split = idx + s * d + vtkm::Min(d, 0);
//assign parent/child pointers
if (vtkm::Min(idx, j) == split)
{
//leaf
ParentPortal.Set(split + InnerCount, idx);
leftChild = split + InnerCount;
}
else
{
//inner node
ParentPortal.Set(split, idx);
leftChild = split;
}
if (vtkm::Max(idx, j) == split + 1)
{
//leaf
ParentPortal.Set(split + InnerCount + 1, idx);
rightChild = split + InnerCount + 1;
}
else
{
ParentPortal.Set(split + 1, idx);
rightChild = split + 1;
}
}
}; // class TreeBuilder
template <typename Device>
VTKM_CONT void LinearBVHBuilder::SortAABBS(
BVHData& bvh,
vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>>& triangleIndices,
vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Int32, 4>>& outputTriangleIndices,
Device vtkmNotUsed(device))
{
//create array of indexes to be sorted with morton codes
vtkm::cont::ArrayHandle<vtkm::Id> iterator;
iterator.PrepareForOutput(bvh.GetNumberOfPrimitives(), Device());
vtkm::worklet::DispatcherMapField<CountingIterator, Device> iteratorDispatcher;
iteratorDispatcher.Invoke(iterator);
//std::cout<<"\n\n\n";
//sort the morton codes
vtkm::cont::DeviceAdapterAlgorithm<Device>::SortByKey(bvh.mortonCodes, iterator);
vtkm::Id arraySize = bvh.GetNumberOfPrimitives();
vtkm::cont::ArrayHandle<vtkm::Float32>* tempStorage;
vtkm::cont::ArrayHandle<vtkm::Float32>* tempPtr;
tempStorage = new vtkm::cont::ArrayHandle<vtkm::Float32>();
//xmins
vtkm::worklet::DispatcherMapField<GatherFloat32<Device>, Device>(
GatherFloat32<Device>(*bvh.xmins, *tempStorage, arraySize))
.Invoke(iterator);
tempPtr = bvh.xmins;
bvh.xmins = tempStorage;
tempStorage = tempPtr;
vtkm::worklet::DispatcherMapField<GatherFloat32<Device>, Device>(
GatherFloat32<Device>(*bvh.ymins, *tempStorage, arraySize))
.Invoke(iterator);
tempPtr = bvh.ymins;
bvh.ymins = tempStorage;
tempStorage = tempPtr;
//zmins
vtkm::worklet::DispatcherMapField<GatherFloat32<Device>, Device>(
GatherFloat32<Device>(*bvh.zmins, *tempStorage, arraySize))
.Invoke(iterator);
tempPtr = bvh.zmins;
bvh.zmins = tempStorage;
tempStorage = tempPtr;
//xmaxs
vtkm::worklet::DispatcherMapField<GatherFloat32<Device>, Device>(
GatherFloat32<Device>(*bvh.xmaxs, *tempStorage, arraySize))
.Invoke(iterator);
tempPtr = bvh.xmaxs;
bvh.xmaxs = tempStorage;
tempStorage = tempPtr;
//ymaxs
vtkm::worklet::DispatcherMapField<GatherFloat32<Device>, Device>(
GatherFloat32<Device>(*bvh.ymaxs, *tempStorage, arraySize))
.Invoke(iterator);
tempPtr = bvh.ymaxs;
bvh.ymaxs = tempStorage;
tempStorage = tempPtr;
//zmaxs
vtkm::worklet::DispatcherMapField<GatherFloat32<Device>, Device>(
GatherFloat32<Device>(*bvh.zmaxs, *tempStorage, arraySize))
.Invoke(iterator);
tempPtr = bvh.zmaxs;
bvh.zmaxs = tempStorage;
tempStorage = tempPtr;
vtkm::worklet::DispatcherMapField<GatherVecCast<Device>, Device>(
GatherVecCast<Device>(triangleIndices, outputTriangleIndices, arraySize))
.Invoke(iterator);
delete tempStorage;
} // method SortAABBs
// Adding this as a template parameter to allow restricted types and
// storage for dynamic coordinate system to limit crazy code bloat and
// compile times.
//
template <typename Device>
VTKM_CONT void LinearBVHBuilder::RunOnDevice(LinearBVH& linearBVH, Device device)
{
Logger* logger = Logger::GetInstance();
logger->OpenLogEntry("bvh_constuct");
logger->AddLogData("device", GetDeviceString(Device()));
vtkm::cont::Timer<Device> constructTimer;
vtkm::cont::DynamicArrayHandleCoordinateSystem coordsHandle = linearBVH.GetCoordsHandle();
vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>> triangleIndices = linearBVH.GetTriangles();
vtkm::Id numberOfTriangles = linearBVH.GetNumberOfTriangles();
logger->AddLogData("bvh_num_triangles ", numberOfTriangles);
const vtkm::Id numBBoxes = numberOfTriangles;
BVHData bvh(numBBoxes, device);
vtkm::cont::Timer<Device> timer;
vtkm::worklet::DispatcherMapField<FindAABBs, Device>(FindAABBs())
.Invoke(triangleIndices,
*bvh.xmins,
*bvh.ymins,
*bvh.zmins,
*bvh.xmaxs,
*bvh.ymaxs,
*bvh.zmaxs,
coordsHandle);
vtkm::Float64 time = timer.GetElapsedTime();
logger->AddLogData("find_aabb", time);
timer.Reset();
// Find the extent of all bounding boxes to generate normalization for morton codes
vtkm::Vec<vtkm::Float32, 3> minExtent(vtkm::Infinity32(), vtkm::Infinity32(), vtkm::Infinity32());
vtkm::Vec<vtkm::Float32, 3> maxExtent(
vtkm::NegativeInfinity32(), vtkm::NegativeInfinity32(), vtkm::NegativeInfinity32());
maxExtent[0] =
vtkm::cont::DeviceAdapterAlgorithm<Device>::Reduce(*bvh.xmaxs, maxExtent[0], MaxValue());
maxExtent[1] =
vtkm::cont::DeviceAdapterAlgorithm<Device>::Reduce(*bvh.ymaxs, maxExtent[1], MaxValue());
maxExtent[2] =
vtkm::cont::DeviceAdapterAlgorithm<Device>::Reduce(*bvh.zmaxs, maxExtent[2], MaxValue());
minExtent[0] =
vtkm::cont::DeviceAdapterAlgorithm<Device>::Reduce(*bvh.xmins, minExtent[0], MinValue());
minExtent[1] =
vtkm::cont::DeviceAdapterAlgorithm<Device>::Reduce(*bvh.ymins, minExtent[1], MinValue());
minExtent[2] =
vtkm::cont::DeviceAdapterAlgorithm<Device>::Reduce(*bvh.zmins, minExtent[2], MinValue());
time = timer.GetElapsedTime();
logger->AddLogData("calc_extents", time);
timer.Reset();
vtkm::Vec<vtkm::Float32, 3> deltaExtent = maxExtent - minExtent;
vtkm::Vec<vtkm::Float32, 3> inverseExtent;
for (int i = 0; i < 3; ++i)
{
inverseExtent[i] = (deltaExtent[i] == 0.f) ? 0 : 1.f / deltaExtent[i];
}
//Generate the morton codes
vtkm::worklet::DispatcherMapField<MortonCodeAABB, Device>(
MortonCodeAABB(inverseExtent, minExtent))
.Invoke(
*bvh.xmins, *bvh.ymins, *bvh.zmins, *bvh.xmaxs, *bvh.ymaxs, *bvh.zmaxs, bvh.mortonCodes);
time = timer.GetElapsedTime();
logger->AddLogData("morton_codes", time);
timer.Reset();
linearBVH.Allocate(bvh.GetNumberOfPrimitives(), Device());
SortAABBS(bvh, triangleIndices, linearBVH.LeafNodes, Device());
time = timer.GetElapsedTime();
logger->AddLogData("sort_aabbs", time);
timer.Reset();
vtkm::worklet::DispatcherMapField<TreeBuilder<Device>, Device>(
TreeBuilder<Device>(bvh.mortonCodes, bvh.parent, bvh.GetNumberOfPrimitives()))
.Invoke(bvh.leftChild, bvh.rightChild);
time = timer.GetElapsedTime();
logger->AddLogData("build_tree", time);
timer.Reset();
const vtkm::Int32 primitiveCount = vtkm::Int32(bvh.GetNumberOfPrimitives());
vtkm::cont::ArrayHandle<vtkm::Int32> counters;
counters.PrepareForOutput(bvh.GetNumberOfPrimitives() - 1, Device());
vtkm::Int32 zero = 0;
vtkm::worklet::DispatcherMapField<MemSet<vtkm::Int32>, Device>(MemSet<vtkm::Int32>(zero))
.Invoke(counters);
vtkm::exec::AtomicArray<vtkm::Int32, Device> atomicCounters(counters);
vtkm::worklet::DispatcherMapField<PropagateAABBs<Device>, Device>(
PropagateAABBs<Device>(
bvh.parent, bvh.leftChild, bvh.rightChild, primitiveCount, linearBVH.FlatBVH, atomicCounters))
.Invoke(vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32>(*bvh.xmins),
vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32>(*bvh.ymins),
vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32>(*bvh.zmins),
vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32>(*bvh.xmaxs),
vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32>(*bvh.ymaxs),
vtkm::exec::ExecutionWholeArrayConst<vtkm::Float32>(*bvh.zmaxs));
time = timer.GetElapsedTime();
logger->AddLogData("propagate_aabbs", time);
time = constructTimer.GetElapsedTime();
logger->CloseLogEntry(time);
}
} //namespace detail
struct LinearBVH::ConstructFunctor
{
LinearBVH* Self;
VTKM_CONT
ConstructFunctor(LinearBVH* self)
: Self(self)
{
}
template <typename Device>
bool operator()(Device)
{
Self->ConstructOnDevice(Device());
return true;
}
};
LinearBVH::LinearBVH()
: IsConstructed(false)
, CanConstruct(false){};
VTKM_CONT
LinearBVH::LinearBVH(vtkm::cont::DynamicArrayHandleCoordinateSystem coordsHandle,
vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>> triangles,
vtkm::Bounds coordBounds)
: CoordBounds(coordBounds)
, CoordsHandle(coordsHandle)
, Triangles(triangles)
, IsConstructed(false)
, CanConstruct(true)
{
}
VTKM_CONT
LinearBVH::LinearBVH(const LinearBVH& other)
: FlatBVH(other.FlatBVH)
, LeafNodes(other.LeafNodes)
, LeafCount(other.LeafCount)
, CoordBounds(other.CoordBounds)
, CoordsHandle(other.CoordsHandle)
, Triangles(other.Triangles)
, IsConstructed(other.IsConstructed)
, CanConstruct(other.CanConstruct)
{
}
template <typename Device>
VTKM_CONT void LinearBVH::Allocate(const vtkm::Id& leafCount, Device deviceAdapter)
{
LeafCount = leafCount;
LeafNodes.PrepareForOutput(leafCount, deviceAdapter);
FlatBVH.PrepareForOutput((leafCount - 1) * 4, deviceAdapter);
}
void LinearBVH::Construct()
{
if (IsConstructed)
return;
if (!CanConstruct)
throw vtkm::cont::ErrorBadValue(
"Linear BVH: coordinates and triangles must be set before calling construct!");
ConstructFunctor functor(this);
vtkm::cont::TryExecute(functor);
IsConstructed = true;
}
VTKM_CONT
void LinearBVH::SetData(vtkm::cont::DynamicArrayHandleCoordinateSystem coordsHandle,
vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>> triangles,
vtkm::Bounds coordBounds)
{
CoordBounds = coordBounds;
CoordsHandle = coordsHandle;
Triangles = triangles;
IsConstructed = false;
CanConstruct = true;
}
template <typename Device>
void LinearBVH::ConstructOnDevice(Device device)
{
Logger* logger = Logger::GetInstance();
vtkm::cont::Timer<Device> timer;
logger->OpenLogEntry("bvh");
if (!CanConstruct)
throw vtkm::cont::ErrorBadValue(
"Linear BVH: coordinates and triangles must be set before calling construct!");
if (!IsConstructed)
{
//
// This algorithm needs at least 2 triangles
//
vtkm::Id numTriangles = this->GetNumberOfTriangles();
if (numTriangles == 1)
{
vtkm::Vec<vtkm::Id, 4> triangle = Triangles.GetPortalControl().Get(0);
Triangles.Allocate(2);
Triangles.GetPortalControl().Set(0, triangle);
Triangles.GetPortalControl().Set(1, triangle);
}
detail::LinearBVHBuilder builder;
builder.RunOnDevice(*this, device);
IsConstructed = true;
}
vtkm::Float64 time = timer.GetElapsedTime();
logger->CloseLogEntry(time);
}
VTKM_CONT
bool LinearBVH::GetIsConstructed() const
{
return IsConstructed;
}
VTKM_CONT
vtkm::cont::DynamicArrayHandleCoordinateSystem LinearBVH::GetCoordsHandle() const
{
return CoordsHandle;
}
VTKM_CONT
vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>> LinearBVH::GetTriangles() const
{
return Triangles;
}
vtkm::Id LinearBVH::GetNumberOfTriangles() const
{
return Triangles.GetPortalConstControl().GetNumberOfValues();
}
}
}
} // namespace vtkm::rendering::raytracing
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