diff options
author | Jacques Lucke <jacques@blender.org> | 2020-07-17 21:51:52 +0300 |
---|---|---|
committer | Jacques Lucke <jacques@blender.org> | 2020-07-17 22:20:51 +0300 |
commit | 25582aef61ce6fdf8e6e9b8f86e5bff294370f3d (patch) | |
tree | e32a47f2b7dabd4d22fb13048165031628337021 /source/blender/simulation/intern/simulation_solver.cc | |
parent | 69d14c0ddbfb6ccbc0e321169967c46389bfdd32 (diff) |
Simulation: separate code from node tree parsing and solver
Diffstat (limited to 'source/blender/simulation/intern/simulation_solver.cc')
-rw-r--r-- | source/blender/simulation/intern/simulation_solver.cc | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/source/blender/simulation/intern/simulation_solver.cc b/source/blender/simulation/intern/simulation_solver.cc new file mode 100644 index 00000000000..289e586682e --- /dev/null +++ b/source/blender/simulation/intern/simulation_solver.cc @@ -0,0 +1,138 @@ +/* + * 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() +{ +} + +class CustomDataAttributesRef { + private: + Vector<void *> buffers_; + uint size_; + std::unique_ptr<fn::AttributesInfo> info_; + + public: + CustomDataAttributesRef(CustomData &custom_data, uint size) + { + fn::AttributesInfoBuilder builder; + for (const CustomDataLayer &layer : Span(custom_data.layers, custom_data.totlayer)) { + buffers_.append(layer.data); + switch (layer.type) { + case CD_PROP_INT32: { + builder.add<int32_t>(layer.name, 0); + break; + } + case CD_PROP_FLOAT3: { + builder.add<float3>(layer.name, {0, 0, 0}); + break; + } + } + } + info_ = std::make_unique<fn::AttributesInfo>(builder); + size_ = size; + } + + 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) +{ + if (CustomData_get_layer_named(&state->attributes, CD_PROP_FLOAT3, "Position") == nullptr) { + CustomData_add_layer_named( + &state->attributes, CD_PROP_FLOAT3, CD_CALLOC, nullptr, state->tot_particles, "Position"); + } + if (CustomData_get_layer_named(&state->attributes, CD_PROP_FLOAT3, "Velocity") == nullptr) { + CustomData_add_layer_named( + &state->attributes, CD_PROP_FLOAT3, CD_CALLOC, nullptr, state->tot_particles, "Velocity"); + } + if (CustomData_get_layer_named(&state->attributes, CD_PROP_INT32, "ID") == nullptr) { + CustomData_add_layer_named( + &state->attributes, CD_PROP_INT32, CD_CALLOC, nullptr, state->tot_particles, "ID"); + } +} + +void initialize_simulation_states(Simulation &simulation, + Depsgraph &UNUSED(depsgraph), + const SimulationInfluences &UNUSED(influences)) +{ + RandomNumberGenerator rng; + + LISTBASE_FOREACH (ParticleSimulationState *, state, &simulation.states) { + state->tot_particles = 1000; + CustomData_realloc(&state->attributes, state->tot_particles); + ensure_attributes_exist(state); + + CustomDataAttributesRef custom_data_attributes{state->attributes, (uint)state->tot_particles}; + + fn::MutableAttributesRef attributes = custom_data_attributes; + MutableSpan<float3> positions = attributes.get<float3>("Position"); + MutableSpan<float3> velocities = attributes.get<float3>("Velocity"); + MutableSpan<int32_t> ids = attributes.get<int32_t>("ID"); + + for (uint i : positions.index_range()) { + positions[i] = {i / 100.0f, 0, 0}; + velocities[i] = {0, rng.get_float() - 0.5f, rng.get_float() - 0.5f}; + ids[i] = i; + } + } +} + +void solve_simulation_time_step(Simulation &simulation, + Depsgraph &UNUSED(depsgraph), + const SimulationInfluences &influences, + float time_step) +{ + LISTBASE_FOREACH (ParticleSimulationState *, state, &simulation.states) { + ensure_attributes_exist(state); + + CustomDataAttributesRef custom_data_attributes{state->attributes, (uint)state->tot_particles}; + + fn::MutableAttributesRef attributes = custom_data_attributes; + MutableSpan<float3> positions = attributes.get<float3>("Position"); + MutableSpan<float3> velocities = attributes.get<float3>("Velocity"); + + Array<float3> force_vectors{(uint)state->tot_particles, {0, 0, 0}}; + const Vector<const ParticleForce *> *forces = influences.particle_forces.lookup_ptr(state); + if (forces != nullptr) { + for (const ParticleForce *force : *forces) { + force->add_force(attributes, force_vectors); + } + } + + for (uint i : positions.index_range()) { + velocities[i] += force_vectors[i] * time_step; + positions[i] += velocities[i] * time_step; + } + } +} + +} // namespace blender::sim |