Brecht Van Lommel
7a74d91e32
Having the OptiX/MetalRT/Embree/MetalRT implementations all in one file with many #ifdefs became too confusing. Instead split it up per device, and also move it together with device specific hit/filter/intersect functions and associated data types.
600 lines
20 KiB
C++
600 lines
20 KiB
C++
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2018-2022 Blender Foundation. */
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/* This class implements a ray accelerator for Cycles using Intel's Embree library.
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* It supports triangles, curves, object and deformation blur and instancing.
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*
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* Since Embree allows object to be either curves or triangles but not both, Cycles object IDs are
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* mapped to Embree IDs by multiplying by two and adding one for curves.
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*
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* This implementation shares RTCDevices between Cycles instances. Eventually each instance should
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* get a separate RTCDevice to correctly keep track of memory usage.
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*
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* Vertex and index buffers are duplicated between Cycles device arrays and Embree. These could be
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* merged, which would require changes to intersection refinement, shader setup, mesh light
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* sampling and a few other places in Cycles where direct access to vertex data is required.
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*/
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#ifdef WITH_EMBREE
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# include <embree3/rtcore_geometry.h>
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# include "bvh/embree.h"
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# include "kernel/device/cpu/bvh.h"
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# include "kernel/device/cpu/compat.h"
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# include "kernel/device/cpu/globals.h"
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# include "scene/hair.h"
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# include "scene/mesh.h"
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# include "scene/object.h"
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# include "scene/pointcloud.h"
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# include "util/foreach.h"
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# include "util/log.h"
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# include "util/progress.h"
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# include "util/stats.h"
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CCL_NAMESPACE_BEGIN
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static_assert(Object::MAX_MOTION_STEPS <= RTC_MAX_TIME_STEP_COUNT,
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"Object and Embree max motion steps inconsistent");
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static_assert(Object::MAX_MOTION_STEPS == Geometry::MAX_MOTION_STEPS,
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"Object and Geometry max motion steps inconsistent");
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static size_t unaccounted_mem = 0;
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static bool rtc_memory_monitor_func(void *userPtr, const ssize_t bytes, const bool)
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{
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Stats *stats = (Stats *)userPtr;
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if (stats) {
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if (bytes > 0) {
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stats->mem_alloc(bytes);
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}
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else {
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stats->mem_free(-bytes);
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}
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}
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else {
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/* A stats pointer may not yet be available. Keep track of the memory usage for later. */
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if (bytes >= 0) {
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atomic_add_and_fetch_z(&unaccounted_mem, bytes);
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}
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else {
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atomic_sub_and_fetch_z(&unaccounted_mem, -bytes);
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}
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}
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return true;
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}
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static void rtc_error_func(void *, enum RTCError, const char *str)
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{
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VLOG_WARNING << str;
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}
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static double progress_start_time = 0.0;
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static bool rtc_progress_func(void *user_ptr, const double n)
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{
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Progress *progress = (Progress *)user_ptr;
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if (time_dt() - progress_start_time < 0.25) {
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return true;
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}
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string msg = string_printf("Building BVH %.0f%%", n * 100.0);
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progress->set_substatus(msg);
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progress_start_time = time_dt();
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return !progress->get_cancel();
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}
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BVHEmbree::BVHEmbree(const BVHParams ¶ms_,
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const vector<Geometry *> &geometry_,
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const vector<Object *> &objects_)
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: BVH(params_, geometry_, objects_),
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scene(NULL),
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rtc_device(NULL),
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build_quality(RTC_BUILD_QUALITY_REFIT)
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{
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SIMD_SET_FLUSH_TO_ZERO;
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}
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BVHEmbree::~BVHEmbree()
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{
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if (scene) {
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rtcReleaseScene(scene);
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}
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}
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void BVHEmbree::build(Progress &progress, Stats *stats, RTCDevice rtc_device_)
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{
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rtc_device = rtc_device_;
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assert(rtc_device);
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rtcSetDeviceErrorFunction(rtc_device, rtc_error_func, NULL);
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rtcSetDeviceMemoryMonitorFunction(rtc_device, rtc_memory_monitor_func, stats);
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progress.set_substatus("Building BVH");
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if (scene) {
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rtcReleaseScene(scene);
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scene = NULL;
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}
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const bool dynamic = params.bvh_type == BVH_TYPE_DYNAMIC;
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const bool compact = params.use_compact_structure;
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scene = rtcNewScene(rtc_device);
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const RTCSceneFlags scene_flags = (dynamic ? RTC_SCENE_FLAG_DYNAMIC : RTC_SCENE_FLAG_NONE) |
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(compact ? RTC_SCENE_FLAG_COMPACT : RTC_SCENE_FLAG_NONE) |
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RTC_SCENE_FLAG_ROBUST;
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rtcSetSceneFlags(scene, scene_flags);
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build_quality = dynamic ? RTC_BUILD_QUALITY_LOW :
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(params.use_spatial_split ? RTC_BUILD_QUALITY_HIGH :
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RTC_BUILD_QUALITY_MEDIUM);
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rtcSetSceneBuildQuality(scene, build_quality);
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int i = 0;
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foreach (Object *ob, objects) {
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if (params.top_level) {
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if (!ob->is_traceable()) {
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++i;
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continue;
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}
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if (!ob->get_geometry()->is_instanced()) {
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add_object(ob, i);
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}
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else {
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add_instance(ob, i);
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}
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}
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else {
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add_object(ob, i);
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}
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++i;
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if (progress.get_cancel())
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return;
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}
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if (progress.get_cancel()) {
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return;
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}
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rtcSetSceneProgressMonitorFunction(scene, rtc_progress_func, &progress);
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rtcCommitScene(scene);
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}
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void BVHEmbree::add_object(Object *ob, int i)
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{
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Geometry *geom = ob->get_geometry();
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if (geom->geometry_type == Geometry::MESH || geom->geometry_type == Geometry::VOLUME) {
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Mesh *mesh = static_cast<Mesh *>(geom);
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if (mesh->num_triangles() > 0) {
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add_triangles(ob, mesh, i);
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}
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}
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else if (geom->geometry_type == Geometry::HAIR) {
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Hair *hair = static_cast<Hair *>(geom);
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if (hair->num_curves() > 0) {
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add_curves(ob, hair, i);
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}
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}
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else if (geom->geometry_type == Geometry::POINTCLOUD) {
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PointCloud *pointcloud = static_cast<PointCloud *>(geom);
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if (pointcloud->num_points() > 0) {
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add_points(ob, pointcloud, i);
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}
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}
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}
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void BVHEmbree::add_instance(Object *ob, int i)
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{
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BVHEmbree *instance_bvh = (BVHEmbree *)(ob->get_geometry()->bvh);
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assert(instance_bvh != NULL);
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const size_t num_object_motion_steps = ob->use_motion() ? ob->get_motion().size() : 1;
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const size_t num_motion_steps = min(num_object_motion_steps, (size_t)RTC_MAX_TIME_STEP_COUNT);
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assert(num_object_motion_steps <= RTC_MAX_TIME_STEP_COUNT);
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RTCGeometry geom_id = rtcNewGeometry(rtc_device, RTC_GEOMETRY_TYPE_INSTANCE);
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rtcSetGeometryInstancedScene(geom_id, instance_bvh->scene);
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rtcSetGeometryTimeStepCount(geom_id, num_motion_steps);
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if (ob->use_motion()) {
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array<DecomposedTransform> decomp(ob->get_motion().size());
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transform_motion_decompose(decomp.data(), ob->get_motion().data(), ob->get_motion().size());
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for (size_t step = 0; step < num_motion_steps; ++step) {
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RTCQuaternionDecomposition rtc_decomp;
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rtcInitQuaternionDecomposition(&rtc_decomp);
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rtcQuaternionDecompositionSetQuaternion(
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&rtc_decomp, decomp[step].x.w, decomp[step].x.x, decomp[step].x.y, decomp[step].x.z);
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rtcQuaternionDecompositionSetScale(
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&rtc_decomp, decomp[step].y.w, decomp[step].z.w, decomp[step].w.w);
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rtcQuaternionDecompositionSetTranslation(
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&rtc_decomp, decomp[step].y.x, decomp[step].y.y, decomp[step].y.z);
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rtcQuaternionDecompositionSetSkew(
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&rtc_decomp, decomp[step].z.x, decomp[step].z.y, decomp[step].w.x);
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rtcSetGeometryTransformQuaternion(geom_id, step, &rtc_decomp);
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}
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}
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else {
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rtcSetGeometryTransform(
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geom_id, 0, RTC_FORMAT_FLOAT3X4_ROW_MAJOR, (const float *)&ob->get_tfm());
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}
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rtcSetGeometryUserData(geom_id, (void *)instance_bvh->scene);
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rtcSetGeometryMask(geom_id, ob->visibility_for_tracing());
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rtcCommitGeometry(geom_id);
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rtcAttachGeometryByID(scene, geom_id, i * 2);
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rtcReleaseGeometry(geom_id);
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}
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void BVHEmbree::add_triangles(const Object *ob, const Mesh *mesh, int i)
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{
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size_t prim_offset = mesh->prim_offset;
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const Attribute *attr_mP = NULL;
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size_t num_motion_steps = 1;
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if (mesh->has_motion_blur()) {
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attr_mP = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
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if (attr_mP) {
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num_motion_steps = mesh->get_motion_steps();
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}
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}
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assert(num_motion_steps <= RTC_MAX_TIME_STEP_COUNT);
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num_motion_steps = min(num_motion_steps, (size_t)RTC_MAX_TIME_STEP_COUNT);
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const size_t num_triangles = mesh->num_triangles();
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RTCGeometry geom_id = rtcNewGeometry(rtc_device, RTC_GEOMETRY_TYPE_TRIANGLE);
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rtcSetGeometryBuildQuality(geom_id, build_quality);
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rtcSetGeometryTimeStepCount(geom_id, num_motion_steps);
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unsigned *rtc_indices = (unsigned *)rtcSetNewGeometryBuffer(
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geom_id, RTC_BUFFER_TYPE_INDEX, 0, RTC_FORMAT_UINT3, sizeof(int) * 3, num_triangles);
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assert(rtc_indices);
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if (!rtc_indices) {
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VLOG_WARNING << "Embree could not create new geometry buffer for mesh " << mesh->name.c_str()
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<< ".\n";
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return;
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}
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for (size_t j = 0; j < num_triangles; ++j) {
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Mesh::Triangle t = mesh->get_triangle(j);
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rtc_indices[j * 3] = t.v[0];
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rtc_indices[j * 3 + 1] = t.v[1];
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rtc_indices[j * 3 + 2] = t.v[2];
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}
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set_tri_vertex_buffer(geom_id, mesh, false);
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rtcSetGeometryUserData(geom_id, (void *)prim_offset);
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rtcSetGeometryOccludedFilterFunction(geom_id, kernel_embree_filter_occluded_func);
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rtcSetGeometryIntersectFilterFunction(geom_id, kernel_embree_filter_intersection_func);
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rtcSetGeometryMask(geom_id, ob->visibility_for_tracing());
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rtcCommitGeometry(geom_id);
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rtcAttachGeometryByID(scene, geom_id, i * 2);
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rtcReleaseGeometry(geom_id);
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}
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void BVHEmbree::set_tri_vertex_buffer(RTCGeometry geom_id, const Mesh *mesh, const bool update)
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{
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const Attribute *attr_mP = NULL;
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size_t num_motion_steps = 1;
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int t_mid = 0;
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if (mesh->has_motion_blur()) {
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attr_mP = mesh->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
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if (attr_mP) {
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num_motion_steps = mesh->get_motion_steps();
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t_mid = (num_motion_steps - 1) / 2;
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if (num_motion_steps > RTC_MAX_TIME_STEP_COUNT) {
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assert(0);
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num_motion_steps = RTC_MAX_TIME_STEP_COUNT;
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}
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}
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}
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const size_t num_verts = mesh->get_verts().size();
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for (int t = 0; t < num_motion_steps; ++t) {
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const float3 *verts;
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if (t == t_mid) {
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verts = mesh->get_verts().data();
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}
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else {
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int t_ = (t > t_mid) ? (t - 1) : t;
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verts = &attr_mP->data_float3()[t_ * num_verts];
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}
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float *rtc_verts = (update) ?
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(float *)rtcGetGeometryBufferData(geom_id, RTC_BUFFER_TYPE_VERTEX, t) :
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(float *)rtcSetNewGeometryBuffer(geom_id,
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RTC_BUFFER_TYPE_VERTEX,
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t,
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RTC_FORMAT_FLOAT3,
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sizeof(float) * 3,
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num_verts + 1);
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assert(rtc_verts);
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if (rtc_verts) {
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for (size_t j = 0; j < num_verts; ++j) {
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rtc_verts[0] = verts[j].x;
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rtc_verts[1] = verts[j].y;
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rtc_verts[2] = verts[j].z;
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rtc_verts += 3;
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}
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}
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if (update) {
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rtcUpdateGeometryBuffer(geom_id, RTC_BUFFER_TYPE_VERTEX, t);
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}
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}
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}
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void BVHEmbree::set_curve_vertex_buffer(RTCGeometry geom_id, const Hair *hair, const bool update)
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{
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const Attribute *attr_mP = NULL;
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size_t num_motion_steps = 1;
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if (hair->has_motion_blur()) {
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attr_mP = hair->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
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if (attr_mP) {
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num_motion_steps = hair->get_motion_steps();
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}
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}
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const size_t num_curves = hair->num_curves();
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size_t num_keys = 0;
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for (size_t j = 0; j < num_curves; ++j) {
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const Hair::Curve c = hair->get_curve(j);
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num_keys += c.num_keys;
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}
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/* Catmull-Rom splines need extra CVs at the beginning and end of each curve. */
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size_t num_keys_embree = num_keys;
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num_keys_embree += num_curves * 2;
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/* Copy the CV data to Embree */
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const int t_mid = (num_motion_steps - 1) / 2;
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const float *curve_radius = &hair->get_curve_radius()[0];
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for (int t = 0; t < num_motion_steps; ++t) {
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const float3 *verts;
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if (t == t_mid || attr_mP == NULL) {
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verts = &hair->get_curve_keys()[0];
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}
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else {
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int t_ = (t > t_mid) ? (t - 1) : t;
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verts = &attr_mP->data_float3()[t_ * num_keys];
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}
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float4 *rtc_verts = (update) ? (float4 *)rtcGetGeometryBufferData(
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geom_id, RTC_BUFFER_TYPE_VERTEX, t) :
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(float4 *)rtcSetNewGeometryBuffer(geom_id,
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RTC_BUFFER_TYPE_VERTEX,
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t,
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RTC_FORMAT_FLOAT4,
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sizeof(float) * 4,
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num_keys_embree);
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assert(rtc_verts);
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if (rtc_verts) {
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const size_t num_curves = hair->num_curves();
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for (size_t j = 0; j < num_curves; ++j) {
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Hair::Curve c = hair->get_curve(j);
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int fk = c.first_key;
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int k = 1;
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for (; k < c.num_keys + 1; ++k, ++fk) {
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rtc_verts[k] = float3_to_float4(verts[fk]);
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rtc_verts[k].w = curve_radius[fk];
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}
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/* Duplicate Embree's Catmull-Rom spline CVs at the start and end of each curve. */
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rtc_verts[0] = rtc_verts[1];
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rtc_verts[k] = rtc_verts[k - 1];
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rtc_verts += c.num_keys + 2;
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}
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}
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if (update) {
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rtcUpdateGeometryBuffer(geom_id, RTC_BUFFER_TYPE_VERTEX, t);
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}
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}
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}
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void BVHEmbree::set_point_vertex_buffer(RTCGeometry geom_id,
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const PointCloud *pointcloud,
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const bool update)
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{
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const Attribute *attr_mP = NULL;
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size_t num_motion_steps = 1;
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if (pointcloud->has_motion_blur()) {
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attr_mP = pointcloud->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
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if (attr_mP) {
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num_motion_steps = pointcloud->get_motion_steps();
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}
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}
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const size_t num_points = pointcloud->num_points();
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/* Copy the point data to Embree */
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const int t_mid = (num_motion_steps - 1) / 2;
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const float *radius = pointcloud->get_radius().data();
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for (int t = 0; t < num_motion_steps; ++t) {
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const float3 *verts;
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if (t == t_mid || attr_mP == NULL) {
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verts = pointcloud->get_points().data();
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}
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else {
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int t_ = (t > t_mid) ? (t - 1) : t;
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verts = &attr_mP->data_float3()[t_ * num_points];
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}
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float4 *rtc_verts = (update) ? (float4 *)rtcGetGeometryBufferData(
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geom_id, RTC_BUFFER_TYPE_VERTEX, t) :
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(float4 *)rtcSetNewGeometryBuffer(geom_id,
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RTC_BUFFER_TYPE_VERTEX,
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t,
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RTC_FORMAT_FLOAT4,
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sizeof(float) * 4,
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num_points);
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assert(rtc_verts);
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if (rtc_verts) {
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for (size_t j = 0; j < num_points; ++j) {
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rtc_verts[j] = float3_to_float4(verts[j]);
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rtc_verts[j].w = radius[j];
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}
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}
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if (update) {
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rtcUpdateGeometryBuffer(geom_id, RTC_BUFFER_TYPE_VERTEX, t);
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}
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}
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}
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void BVHEmbree::add_points(const Object *ob, const PointCloud *pointcloud, int i)
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{
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size_t prim_offset = pointcloud->prim_offset;
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const Attribute *attr_mP = NULL;
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size_t num_motion_steps = 1;
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if (pointcloud->has_motion_blur()) {
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attr_mP = pointcloud->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
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if (attr_mP) {
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num_motion_steps = pointcloud->get_motion_steps();
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}
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}
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enum RTCGeometryType type = RTC_GEOMETRY_TYPE_SPHERE_POINT;
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RTCGeometry geom_id = rtcNewGeometry(rtc_device, type);
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rtcSetGeometryBuildQuality(geom_id, build_quality);
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rtcSetGeometryTimeStepCount(geom_id, num_motion_steps);
|
|
|
|
set_point_vertex_buffer(geom_id, pointcloud, false);
|
|
|
|
rtcSetGeometryUserData(geom_id, (void *)prim_offset);
|
|
rtcSetGeometryIntersectFilterFunction(geom_id, kernel_embree_filter_func_backface_cull);
|
|
rtcSetGeometryOccludedFilterFunction(geom_id, kernel_embree_filter_occluded_func_backface_cull);
|
|
rtcSetGeometryMask(geom_id, ob->visibility_for_tracing());
|
|
|
|
rtcCommitGeometry(geom_id);
|
|
rtcAttachGeometryByID(scene, geom_id, i * 2);
|
|
rtcReleaseGeometry(geom_id);
|
|
}
|
|
|
|
void BVHEmbree::add_curves(const Object *ob, const Hair *hair, int i)
|
|
{
|
|
size_t prim_offset = hair->curve_segment_offset;
|
|
|
|
const Attribute *attr_mP = NULL;
|
|
size_t num_motion_steps = 1;
|
|
if (hair->has_motion_blur()) {
|
|
attr_mP = hair->attributes.find(ATTR_STD_MOTION_VERTEX_POSITION);
|
|
if (attr_mP) {
|
|
num_motion_steps = hair->get_motion_steps();
|
|
}
|
|
}
|
|
|
|
assert(num_motion_steps <= RTC_MAX_TIME_STEP_COUNT);
|
|
num_motion_steps = min(num_motion_steps, (size_t)RTC_MAX_TIME_STEP_COUNT);
|
|
|
|
const size_t num_curves = hair->num_curves();
|
|
size_t num_segments = 0;
|
|
for (size_t j = 0; j < num_curves; ++j) {
|
|
Hair::Curve c = hair->get_curve(j);
|
|
assert(c.num_segments() > 0);
|
|
num_segments += c.num_segments();
|
|
}
|
|
|
|
enum RTCGeometryType type = (hair->curve_shape == CURVE_RIBBON ?
|
|
RTC_GEOMETRY_TYPE_FLAT_CATMULL_ROM_CURVE :
|
|
RTC_GEOMETRY_TYPE_ROUND_CATMULL_ROM_CURVE);
|
|
|
|
RTCGeometry geom_id = rtcNewGeometry(rtc_device, type);
|
|
rtcSetGeometryTessellationRate(geom_id, params.curve_subdivisions + 1);
|
|
unsigned *rtc_indices = (unsigned *)rtcSetNewGeometryBuffer(
|
|
geom_id, RTC_BUFFER_TYPE_INDEX, 0, RTC_FORMAT_UINT, sizeof(int), num_segments);
|
|
size_t rtc_index = 0;
|
|
for (size_t j = 0; j < num_curves; ++j) {
|
|
Hair::Curve c = hair->get_curve(j);
|
|
for (size_t k = 0; k < c.num_segments(); ++k) {
|
|
rtc_indices[rtc_index] = c.first_key + k;
|
|
/* Room for extra CVs at Catmull-Rom splines. */
|
|
rtc_indices[rtc_index] += j * 2;
|
|
|
|
++rtc_index;
|
|
}
|
|
}
|
|
|
|
rtcSetGeometryBuildQuality(geom_id, build_quality);
|
|
rtcSetGeometryTimeStepCount(geom_id, num_motion_steps);
|
|
|
|
set_curve_vertex_buffer(geom_id, hair, false);
|
|
|
|
rtcSetGeometryUserData(geom_id, (void *)prim_offset);
|
|
if (hair->curve_shape == CURVE_RIBBON) {
|
|
rtcSetGeometryIntersectFilterFunction(geom_id, kernel_embree_filter_intersection_func);
|
|
rtcSetGeometryOccludedFilterFunction(geom_id, kernel_embree_filter_occluded_func);
|
|
}
|
|
else {
|
|
rtcSetGeometryIntersectFilterFunction(geom_id, kernel_embree_filter_func_backface_cull);
|
|
rtcSetGeometryOccludedFilterFunction(geom_id,
|
|
kernel_embree_filter_occluded_func_backface_cull);
|
|
}
|
|
rtcSetGeometryMask(geom_id, ob->visibility_for_tracing());
|
|
|
|
rtcCommitGeometry(geom_id);
|
|
rtcAttachGeometryByID(scene, geom_id, i * 2 + 1);
|
|
rtcReleaseGeometry(geom_id);
|
|
}
|
|
|
|
void BVHEmbree::refit(Progress &progress)
|
|
{
|
|
progress.set_substatus("Refitting BVH nodes");
|
|
|
|
/* Update all vertex buffers, then tell Embree to rebuild/-fit the BVHs. */
|
|
unsigned geom_id = 0;
|
|
foreach (Object *ob, objects) {
|
|
if (!params.top_level || (ob->is_traceable() && !ob->get_geometry()->is_instanced())) {
|
|
Geometry *geom = ob->get_geometry();
|
|
|
|
if (geom->geometry_type == Geometry::MESH || geom->geometry_type == Geometry::VOLUME) {
|
|
Mesh *mesh = static_cast<Mesh *>(geom);
|
|
if (mesh->num_triangles() > 0) {
|
|
RTCGeometry geom = rtcGetGeometry(scene, geom_id);
|
|
set_tri_vertex_buffer(geom, mesh, true);
|
|
rtcSetGeometryUserData(geom, (void *)mesh->prim_offset);
|
|
rtcCommitGeometry(geom);
|
|
}
|
|
}
|
|
else if (geom->geometry_type == Geometry::HAIR) {
|
|
Hair *hair = static_cast<Hair *>(geom);
|
|
if (hair->num_curves() > 0) {
|
|
RTCGeometry geom = rtcGetGeometry(scene, geom_id + 1);
|
|
set_curve_vertex_buffer(geom, hair, true);
|
|
rtcSetGeometryUserData(geom, (void *)hair->curve_segment_offset);
|
|
rtcCommitGeometry(geom);
|
|
}
|
|
}
|
|
else if (geom->geometry_type == Geometry::POINTCLOUD) {
|
|
PointCloud *pointcloud = static_cast<PointCloud *>(geom);
|
|
if (pointcloud->num_points() > 0) {
|
|
RTCGeometry geom = rtcGetGeometry(scene, geom_id);
|
|
set_point_vertex_buffer(geom, pointcloud, true);
|
|
rtcCommitGeometry(geom);
|
|
}
|
|
}
|
|
}
|
|
geom_id += 2;
|
|
}
|
|
|
|
rtcCommitScene(scene);
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|
|
|
|
#endif /* WITH_EMBREE */
|