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// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "../common/tutorial/tutorial_device.h"
namespace embree
{
RTCScene g_scene = nullptr;
/* This function is called by the builder to signal progress and to
* report memory consumption. */
bool memoryMonitor(void* userPtr, ssize_t bytes, bool post) {
return true;
}
bool buildProgress (void* userPtr, double f) {
return true;
}
void splitPrimitive (const RTCBuildPrimitive* prim, unsigned int dim, float pos, RTCBounds* lprim, RTCBounds* rprim, void* userPtr)
{
assert(dim < 3);
assert(prim->geomID == 0);
*(BBox3fa*) lprim = *(BBox3fa*) prim;
*(BBox3fa*) rprim = *(BBox3fa*) prim;
(&lprim->upper_x)[dim] = pos;
(&rprim->lower_x)[dim] = pos;
}
struct Node
{
virtual float sah() = 0;
};
struct InnerNode : public Node
{
BBox3fa bounds[2];
Node* children[2];
InnerNode() {
bounds[0] = bounds[1] = empty;
children[0] = children[1] = nullptr;
}
float sah() {
return 1.0f + (area(bounds[0])*children[0]->sah() + area(bounds[1])*children[1]->sah())/area(merge(bounds[0],bounds[1]));
}
static void* create (RTCThreadLocalAllocator alloc, unsigned int numChildren, void* userPtr)
{
assert(numChildren == 2);
void* ptr = rtcThreadLocalAlloc(alloc,sizeof(InnerNode),16);
return (void*) new (ptr) InnerNode;
}
static void setChildren (void* nodePtr, void** childPtr, unsigned int numChildren, void* userPtr)
{
assert(numChildren == 2);
for (size_t i=0; i<2; i++)
((InnerNode*)nodePtr)->children[i] = (Node*) childPtr[i];
}
static void setBounds (void* nodePtr, const RTCBounds** bounds, unsigned int numChildren, void* userPtr)
{
assert(numChildren == 2);
for (size_t i=0; i<2; i++)
((InnerNode*)nodePtr)->bounds[i] = *(const BBox3fa*) bounds[i];
}
};
struct LeafNode : public Node
{
unsigned id;
BBox3fa bounds;
LeafNode (unsigned id, const BBox3fa& bounds)
: id(id), bounds(bounds) {}
float sah() {
return 1.0f;
}
static void* create (RTCThreadLocalAllocator alloc, const RTCBuildPrimitive* prims, size_t numPrims, void* userPtr)
{
assert(numPrims == 1);
void* ptr = rtcThreadLocalAlloc(alloc,sizeof(LeafNode),16);
return (void*) new (ptr) LeafNode(prims->primID,*(BBox3fa*)prims);
}
};
void build(RTCBuildQuality quality, avector<RTCBuildPrimitive>& prims_i, char* cfg, size_t extraSpace = 0)
{
rtcSetDeviceMemoryMonitorFunction(g_device,memoryMonitor,nullptr);
RTCBVH bvh = rtcNewBVH(g_device);
avector<RTCBuildPrimitive> prims;
prims.reserve(prims_i.size()+extraSpace);
prims.resize(prims_i.size());
/* settings for BVH build */
RTCBuildArguments arguments = rtcDefaultBuildArguments();
arguments.byteSize = sizeof(arguments);
arguments.buildFlags = RTC_BUILD_FLAG_DYNAMIC;
arguments.buildQuality = quality;
arguments.maxBranchingFactor = 2;
arguments.maxDepth = 1024;
arguments.sahBlockSize = 1;
arguments.minLeafSize = 1;
arguments.maxLeafSize = 1;
arguments.traversalCost = 1.0f;
arguments.intersectionCost = 1.0f;
arguments.bvh = bvh;
arguments.primitives = prims.data();
arguments.primitiveCount = prims.size();
arguments.primitiveArrayCapacity = prims.capacity();
arguments.createNode = InnerNode::create;
arguments.setNodeChildren = InnerNode::setChildren;
arguments.setNodeBounds = InnerNode::setBounds;
arguments.createLeaf = LeafNode::create;
arguments.splitPrimitive = splitPrimitive;
arguments.buildProgress = buildProgress;
arguments.userPtr = nullptr;
for (size_t i=0; i<10; i++)
{
/* we recreate the prims array here, as the builders modify this array */
for (size_t j=0; j<prims.size(); j++) prims[j] = prims_i[j];
std::cout << "iteration " << i << ": building BVH over " << prims.size() << " primitives, " << std::flush;
double t0 = getSeconds();
Node* root = (Node*) rtcBuildBVH(&arguments);
double t1 = getSeconds();
const float sah = root ? root->sah() : 0.0f;
std::cout << 1000.0f*(t1-t0) << "ms, " << 1E-6*double(prims.size())/(t1-t0) << " Mprims/s, sah = " << sah << " [DONE]" << std::endl;
}
rtcReleaseBVH(bvh);
}
/* called by the C++ code for initialization */
extern "C" void device_init (char* cfg)
{
/* create random bounding boxes */
const size_t N = 2300000;
const size_t extraSpace = 1000000;
avector<RTCBuildPrimitive> prims;
prims.resize(N);
for (size_t i=0; i<N; i++)
{
const float x = float(drand48());
const float y = float(drand48());
const float z = float(drand48());
const Vec3fa p = 1000.0f*Vec3fa(x,y,z);
const BBox3fa b = BBox3fa(p,p+Vec3fa(1.0f));
RTCBuildPrimitive prim;
prim.lower_x = b.lower.x;
prim.lower_y = b.lower.y;
prim.lower_z = b.lower.z;
prim.geomID = 0;
prim.upper_x = b.upper.x;
prim.upper_y = b.upper.y;
prim.upper_z = b.upper.z;
prim.primID = (unsigned) i;
prims[i] = prim;
}
std::cout << "Low quality BVH build:" << std::endl;
build(RTC_BUILD_QUALITY_LOW,prims,cfg);
std::cout << "Normal quality BVH build:" << std::endl;
build(RTC_BUILD_QUALITY_MEDIUM,prims,cfg);
std::cout << "High quality BVH build:" << std::endl;
build(RTC_BUILD_QUALITY_HIGH,prims,cfg,extraSpace);
}
void renderFrameStandard (int* pixels,
const unsigned int width,
const unsigned int height,
const float time,
const ISPCCamera& camera)
{
}
/* called by the C++ code to render */
extern "C" void device_render (int* pixels,
const int width,
const int height,
const float time,
const ISPCCamera& camera)
{
}
/* called by the C++ code for cleanup */
extern "C" void device_cleanup () {
}
}
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