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// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "multi_instanced_geometry_device.h"
/*
* Our scene has multiple instantiated trees on the root level,
* which in turn instantiate twigs.
*/
namespace embree {
/*
* Combined quad/triangle meshes.
*/
struct Mesh
{
const unsigned int numVertices;
const float* vertices;
const unsigned int numTriangles;
const unsigned int* triangleIndices;
const unsigned int numQuads;
const unsigned int* quadIndices;
};
/*
* Instances.
*/
struct Instances
{
const unsigned int numInstances;
// These are the column vectors of the 3x4 transformation
// matrix from instance-local space to parent space.
const float* localX;
const float* localY;
const float* localZ;
const float* position;
};
/*
* Create a triangle mesh geometry from the given mesh.
*/
RTCGeometry makeTriangleMesh(RTCDevice device, const Mesh& mesh)
{
RTCGeometry geom = rtcNewGeometry(device, RTC_GEOMETRY_TYPE_TRIANGLE);
const unsigned int timeStep = 0;
rtcSetSharedGeometryBuffer(geom,
RTC_BUFFER_TYPE_VERTEX,
timeStep,
RTC_FORMAT_FLOAT3,
mesh.vertices,
0,
3*sizeof(float),
mesh.numVertices);
rtcSetSharedGeometryBuffer(geom,
RTC_BUFFER_TYPE_INDEX,
timeStep,
RTC_FORMAT_UINT3,
mesh.triangleIndices,
0,
3*sizeof(unsigned int),
mesh.numTriangles);
rtcCommitGeometry(geom);
return geom;
}
/*
* Create a quad mesh geometry from the given mesh.
*/
RTCGeometry makeQuadMesh(RTCDevice device, const Mesh& mesh)
{
RTCGeometry geom = rtcNewGeometry(device, RTC_GEOMETRY_TYPE_QUAD);
const unsigned int timeStep = 0;
rtcSetSharedGeometryBuffer(geom,
RTC_BUFFER_TYPE_VERTEX,
timeStep,
RTC_FORMAT_FLOAT3,
mesh.vertices,
0,
3*sizeof(float),
mesh.numVertices);
rtcSetSharedGeometryBuffer(geom,
RTC_BUFFER_TYPE_INDEX,
timeStep,
RTC_FORMAT_UINT4,
mesh.quadIndices,
0,
4*sizeof(unsigned int),
mesh.numQuads);
rtcCommitGeometry(geom);
return geom;
}
/*
* Add a mesh to a scene.
*/
void addMesh(RTCDevice device, RTCScene scene, const Mesh& mesh)
{
if (mesh.numTriangles > 0)
{
RTCGeometry geom = makeTriangleMesh(device, mesh);
rtcAttachGeometry(scene, geom);
rtcReleaseGeometry(geom);
}
if (mesh.numQuads > 0)
{
RTCGeometry geom = makeQuadMesh(device, mesh);
rtcAttachGeometry(scene, geom);
rtcReleaseGeometry(geom);
}
}
/*
* Build a transformation matrix from individual vectors.
*/
__forceinline AffineSpace3fa buildMatrix(const float* localX,
const float* localY,
const float* localZ,
const float* position)
{
return AffineSpace3fa::translate(Vec3fa(position[0], position[1], position[2]))
* AffineSpace3fa(LinearSpace3fa(Vec3fa(localX[0], localX[1], localX[2]),
Vec3fa(localY[0], localY[1], localY[2]),
Vec3fa(localZ[0], localZ[1], localZ[2])));
}
/*
* Add instances to a scene.
* This function also writes normal transforms to the given map.
*/
void addInstances(RTCDevice device,
RTCScene scene,
RTCScene exemplar,
const Instances& instances,
LinearSpace3fa* normalTransforms)
{
for (unsigned int i = 0; i < instances.numInstances; ++i)
{
const unsigned int idx = 3*i;
auto M = buildMatrix(instances.localX + idx,
instances.localY + idx,
instances.localZ + idx,
instances.position + idx);
RTCGeometry geom = rtcNewGeometry(device, RTC_GEOMETRY_TYPE_INSTANCE);
rtcSetGeometryInstancedScene(geom, exemplar);
rtcSetGeometryTimeStepCount(geom, 1);
rtcSetGeometryTransform(geom,
0,
RTC_FORMAT_FLOAT4X4_COLUMN_MAJOR,
reinterpret_cast<float*>(&M));
rtcCommitGeometry(geom);
rtcAttachGeometryByID(scene, geom, i);
rtcReleaseGeometry(geom);
normalTransforms[i] = transposed(rcp(M.l));
}
}
/*
* Initialize the main scene. Note that we store complex geometry in
* separate files purely for readability.
*/
#include "geometry/ground.cpp"
#include "geometry/twig.cpp"
#include "geometry/tree.cpp"
#include "geometry/trees.cpp"
extern "C" void cleanupScene(TutorialData& data)
{
if ( data.g_normalTransforms )
{
#if 0 // workaround
if (data.g_normalTransforms[0]) { alignedUSMFree(data.g_normalTransforms[0]); data.g_normalTransforms[0] = nullptr; }
if (data.g_normalTransforms[1]) { alignedUSMFree(data.g_normalTransforms[1]); data.g_normalTransforms[1] = nullptr; }
if (data.g_normalTransforms) { alignedUSMFree(data.g_normalTransforms); data.g_normalTransforms = nullptr; }
if (data.g_instanceLevels.numInstancesOnLevel) { alignedUSMFree(data.g_instanceLevels.numInstancesOnLevel); data.g_instanceLevels.numInstancesOnLevel = nullptr; }
#endif
data.g_normalTransforms = nullptr;
}
}
extern "C" RTCScene initializeScene(TutorialData& data, RTCDevice device)
{
cleanupScene(data);
data.g_instanceLevels.numLevels = 2;
data.g_instanceLevels.numInstancesOnLevel = (unsigned int*)alignedUSMMalloc(2*sizeof(unsigned int), 16);
data.g_instanceLevels.numInstancesOnLevel[0] = Trees::instances.numInstances;
data.g_instanceLevels.numInstancesOnLevel[1] = Twigs01::instances.numInstances;
data.g_normalTransforms = (LinearSpace3fa**)alignedUSMMalloc(2*sizeof(LinearSpace3fa*), 16);
data.g_normalTransforms[0] = (LinearSpace3fa*)alignedUSMMalloc(data.g_instanceLevels.numInstancesOnLevel[0]*sizeof(LinearSpace3fa), 16);
data.g_normalTransforms[1] = (LinearSpace3fa*)alignedUSMMalloc(data.g_instanceLevels.numInstancesOnLevel[1]*sizeof(LinearSpace3fa), 16);
data.g_instanceLevels.normalTransforms = data.g_normalTransforms;
RandomSampler sampler;
RandomSampler_init(sampler, 98248);
RTCScene twig = rtcNewScene(device);
rtcSetSceneFlags(twig, RTC_SCENE_FLAG_FILTER_FUNCTION_IN_ARGUMENTS);
addMesh(device, twig, Twig::mesh);
rtcCommitScene(twig);
RTCScene tree = rtcNewScene(device);
rtcSetSceneFlags(tree, RTC_SCENE_FLAG_FILTER_FUNCTION_IN_ARGUMENTS);
addInstances(device, tree, twig, Twigs01::instances, data.g_normalTransforms[1]);
addMesh(device, tree, Tree01::mesh);
rtcCommitScene(tree);
rtcReleaseScene(twig);
RTCScene scene = rtcNewScene(device);
rtcSetSceneFlags(scene, RTC_SCENE_FLAG_FILTER_FUNCTION_IN_ARGUMENTS);
addInstances(device, scene, tree, Trees::instances, data.g_normalTransforms[0]);
addMesh(device, scene, Ground::mesh);
rtcReleaseScene(tree);
rtcCommitScene(scene);
return scene;
}
// -----------------------------------------------------------------------------
} // namespace embree
// -----------------------------------------------------------------------------
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