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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "simulation_solver.hh"
#include "BKE_customdata.h"
#include "BLI_rand.hh"
namespace blender::sim {
ParticleForce::~ParticleForce()
{
}
ParticleEmitter::~ParticleEmitter()
{
}
static CustomDataType cpp_to_custom_data_type(const fn::CPPType &type)
{
if (type.is<float3>()) {
return CD_PROP_FLOAT3;
}
if (type.is<float>()) {
return CD_PROP_FLOAT;
}
if (type.is<int32_t>()) {
return CD_PROP_INT32;
}
BLI_assert(false);
return CD_PROP_FLOAT;
}
static const fn::CPPType &custom_to_cpp_data_type(CustomDataType type)
{
switch (type) {
case CD_PROP_FLOAT3:
return fn::CPPType::get<float3>();
case CD_PROP_FLOAT:
return fn::CPPType::get<float>();
case CD_PROP_INT32:
return fn::CPPType::get<int32_t>();
default:
BLI_assert(false);
return fn::CPPType::get<float>();
}
}
class CustomDataAttributesRef {
private:
Array<void *> buffers_;
int64_t size_;
const fn::AttributesInfo &info_;
public:
CustomDataAttributesRef(CustomData &custom_data, int64_t size, const fn::AttributesInfo &info)
: buffers_(info.size(), nullptr), size_(size), info_(info)
{
for (int attribute_index : info.index_range()) {
StringRefNull name = info.name_of(attribute_index);
const fn::CPPType &cpp_type = info.type_of(attribute_index);
CustomDataType custom_type = cpp_to_custom_data_type(cpp_type);
void *data = CustomData_get_layer_named(&custom_data, custom_type, name.c_str());
buffers_[attribute_index] = data;
}
}
operator fn::MutableAttributesRef()
{
return fn::MutableAttributesRef(info_, buffers_, size_);
}
operator fn::AttributesRef() const
{
return fn::AttributesRef(info_, buffers_, size_);
}
};
static void ensure_attributes_exist(ParticleSimulationState *state, const fn::AttributesInfo &info)
{
bool found_layer_to_remove;
do {
found_layer_to_remove = false;
for (int layer_index = 0; layer_index < state->attributes.totlayer; layer_index++) {
CustomDataLayer *layer = &state->attributes.layers[layer_index];
BLI_assert(layer->name != nullptr);
const fn::CPPType &cpp_type = custom_to_cpp_data_type((CustomDataType)layer->type);
StringRefNull name = layer->name;
if (!info.has_attribute(name, cpp_type)) {
found_layer_to_remove = true;
CustomData_free_layer(&state->attributes, layer->type, state->tot_particles, layer_index);
break;
}
}
} while (found_layer_to_remove);
for (int attribute_index : info.index_range()) {
StringRefNull attribute_name = info.name_of(attribute_index);
const fn::CPPType &cpp_type = info.type_of(attribute_index);
CustomDataType custom_type = cpp_to_custom_data_type(cpp_type);
if (CustomData_get_layer_named(&state->attributes, custom_type, attribute_name.c_str()) ==
nullptr) {
void *data = CustomData_add_layer_named(&state->attributes,
custom_type,
CD_CALLOC,
nullptr,
state->tot_particles,
attribute_name.c_str());
cpp_type.fill_uninitialized(info.default_of(attribute_index), data, state->tot_particles);
}
}
}
void initialize_simulation_states(Simulation &simulation,
Depsgraph &UNUSED(depsgraph),
const SimulationInfluences &UNUSED(influences))
{
simulation.current_simulation_time = 0.0f;
}
void solve_simulation_time_step(Simulation &simulation,
Depsgraph &depsgraph,
const SimulationInfluences &influences,
float time_step)
{
SimulationSolveContext solve_context{simulation, depsgraph, influences};
TimeInterval simulation_time_interval{simulation.current_simulation_time, time_step};
Map<std::string, std::unique_ptr<fn::AttributesInfo>> attribute_infos;
Map<std::string, std::unique_ptr<ParticleAllocator>> particle_allocators;
LISTBASE_FOREACH (ParticleSimulationState *, state, &simulation.states) {
const fn::AttributesInfoBuilder &builder = *influences.particle_attributes_builder.lookup_as(
state->head.name);
auto info = std::make_unique<fn::AttributesInfo>(builder);
ensure_attributes_exist(state, *info);
particle_allocators.add_new(
state->head.name, std::make_unique<ParticleAllocator>(*info, state->next_particle_id));
attribute_infos.add_new(state->head.name, std::move(info));
}
LISTBASE_FOREACH (ParticleSimulationState *, state, &simulation.states) {
const fn::AttributesInfo &attributes_info = *attribute_infos.lookup_as(state->head.name);
CustomDataAttributesRef custom_data_attributes{
state->attributes, state->tot_particles, attributes_info};
fn::MutableAttributesRef attributes = custom_data_attributes;
MutableSpan<float3> positions = attributes.get<float3>("Position");
MutableSpan<float3> velocities = attributes.get<float3>("Velocity");
Array<float3> force_vectors{state->tot_particles, {0, 0, 0}};
const Vector<const ParticleForce *> *forces = influences.particle_forces.lookup_ptr(
state->head.name);
if (forces != nullptr) {
ParticleChunkContext particle_chunk_context{IndexMask(state->tot_particles), attributes};
ParticleForceContext particle_force_context{
solve_context, particle_chunk_context, force_vectors};
for (const ParticleForce *force : *forces) {
force->add_force(particle_force_context);
}
}
for (int i : positions.index_range()) {
velocities[i] += force_vectors[i] * time_step;
positions[i] += velocities[i] * time_step;
}
}
for (const ParticleEmitter *emitter : influences.particle_emitters) {
ParticleEmitterContext emitter_context{
solve_context, particle_allocators, simulation_time_interval};
emitter->emit(emitter_context);
}
LISTBASE_FOREACH (ParticleSimulationState *, state, &simulation.states) {
const fn::AttributesInfo &attributes_info = *attribute_infos.lookup_as(state->head.name);
ParticleAllocator &allocator = *particle_allocators.lookup_as(state->head.name);
const int emitted_particle_amount = allocator.total_allocated();
const int old_particle_amount = state->tot_particles;
const int new_particle_amount = old_particle_amount + emitted_particle_amount;
CustomData_realloc(&state->attributes, new_particle_amount);
CustomDataAttributesRef custom_data_attributes{
state->attributes, new_particle_amount, attributes_info};
fn::MutableAttributesRef attributes = custom_data_attributes;
int offset = old_particle_amount;
for (fn::MutableAttributesRef emitted_attributes : allocator.get_allocations()) {
fn::MutableAttributesRef dst_attributes = attributes.slice(
IndexRange(offset, emitted_attributes.size()));
for (int attribute_index : attributes.info().index_range()) {
fn::GMutableSpan emitted_data = emitted_attributes.get(attribute_index);
fn::GMutableSpan dst = dst_attributes.get(attribute_index);
const fn::CPPType &type = dst.type();
type.copy_to_uninitialized_n(
emitted_data.buffer(), dst.buffer(), emitted_attributes.size());
}
offset += emitted_attributes.size();
}
state->tot_particles = new_particle_amount;
state->next_particle_id += emitted_particle_amount;
}
simulation.current_simulation_time = simulation_time_interval.end();
}
} // namespace blender::sim
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