Particles: improve mesh emitter

Particles are now emitted from vertices of the mesh.

1 files changed, 270 insertions, 0 deletions

diff --git a/source/blender/simulation/intern/simulation_solver_influences.hh b/source/blender/simulation/intern/simulation_solver_influences.hh
new file mode 100644
index 00000000000..8d5e171bea0
--- /dev/null
+++ b/source/blender/simulation/intern/simulation_solver_influences.hh
@@ -0,0 +1,270 @@
+/*
+ * 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.
+ */
+
+#ifndef __SIM_SIMULATION_SOLVER_INFLUENCES_HH__
+#define __SIM_SIMULATION_SOLVER_INFLUENCES_HH__
+
+#include "BLI_float3.hh"
+#include "BLI_span.hh"
+
+#include "DNA_simulation_types.h"
+
+#include "FN_attributes_ref.hh"
+
+#include "BKE_persistent_data_handle.hh"
+#include "BKE_simulation.h"
+
+#include "particle_allocator.hh"
+#include "time_interval.hh"
+
+namespace blender::sim {
+
+class ParticleEmitterContext;
+class ParticleForceContext;
+
+class ParticleEmitter {
+ public:
+  virtual ~ParticleEmitter();
+  virtual void emit(ParticleEmitterContext &context) const = 0;
+};
+
+class ParticleForce {
+ public:
+  virtual ~ParticleForce();
+  virtual void add_force(ParticleForceContext &context) const = 0;
+};
+
+struct SimulationInfluences {
+  Map<std::string, Vector<const ParticleForce *>> particle_forces;
+  Map<std::string, fn::AttributesInfoBuilder *> particle_attributes_builder;
+  Vector<const ParticleEmitter *> particle_emitters;
+};
+
+class SimulationStateMap {
+ private:
+  Map<StringRefNull, SimulationState *> states_by_name_;
+  Map<StringRefNull, Vector<SimulationState *>> states_by_type_;
+
+ public:
+  void add(SimulationState *state)
+  {
+    states_by_name_.add_new(state->name, state);
+    states_by_type_.lookup_or_add_default(state->type).append(state);
+  }
+
+  template<typename StateType> StateType *lookup(StringRef name) const
+  {
+    const char *type = BKE_simulation_get_state_type_name<StateType>();
+    return (StateType *)this->lookup_name_type(name, type);
+  }
+
+  template<typename StateType> Span<StateType *> lookup() const
+  {
+    const char *type = BKE_simulation_get_state_type_name<StateType>();
+    return this->lookup_type(type).cast<StateType *>();
+  }
+
+  SimulationState *lookup_name_type(StringRef name, StringRef type) const
+  {
+    SimulationState *state = states_by_name_.lookup_default_as(name, nullptr);
+    if (state == nullptr) {
+      return nullptr;
+    }
+    if (state->type == type) {
+      return state;
+    }
+    return nullptr;
+  }
+
+  Span<SimulationState *> lookup_type(StringRef type) const
+  {
+    const Vector<SimulationState *> *states = states_by_type_.lookup_ptr_as(type);
+    if (states == nullptr) {
+      return {};
+    }
+    else {
+      return states->as_span();
+    }
+  }
+};
+
+class SimulationSolveContext {
+ private:
+  Simulation &simulation_;
+  Depsgraph &depsgraph_;
+  const SimulationInfluences &influences_;
+  TimeInterval solve_interval_;
+  const SimulationStateMap &state_map_;
+  const bke::PersistentDataHandleMap &id_handle_map_;
+
+ public:
+  SimulationSolveContext(Simulation &simulation,
+                         Depsgraph &depsgraph,
+                         const SimulationInfluences &influences,
+                         TimeInterval solve_interval,
+                         const SimulationStateMap &state_map,
+                         const bke::PersistentDataHandleMap &handle_map)
+      : simulation_(simulation),
+        depsgraph_(depsgraph),
+        influences_(influences),
+        solve_interval_(solve_interval),
+        state_map_(state_map),
+        id_handle_map_(handle_map)
+  {
+  }
+
+  TimeInterval solve_interval() const
+  {
+    return solve_interval_;
+  }
+
+  const SimulationInfluences &influences() const
+  {
+    return influences_;
+  }
+
+  const bke::PersistentDataHandleMap &handle_map() const
+  {
+    return id_handle_map_;
+  }
+
+  const SimulationStateMap &state_map() const
+  {
+    return state_map_;
+  }
+};
+
+class ParticleAllocators {
+ private:
+  Map<std::string, std::unique_ptr<ParticleAllocator>> &allocators_;
+
+ public:
+  ParticleAllocators(Map<std::string, std::unique_ptr<ParticleAllocator>> &allocators)
+      : allocators_(allocators)
+  {
+  }
+
+  ParticleAllocator *try_get_allocator(StringRef particle_simulation_name)
+  {
+    auto *ptr = allocators_.lookup_ptr_as(particle_simulation_name);
+    if (ptr != nullptr) {
+      return ptr->get();
+    }
+    else {
+      return nullptr;
+    }
+  }
+};
+
+class ParticleChunkContext {
+ private:
+  IndexMask index_mask_;
+  fn::MutableAttributesRef attributes_;
+
+ public:
+  ParticleChunkContext(IndexMask index_mask, fn::MutableAttributesRef attributes)
+      : index_mask_(index_mask), attributes_(attributes)
+  {
+  }
+
+  IndexMask index_mask() const
+  {
+    return index_mask_;
+  }
+
+  fn::MutableAttributesRef attributes()
+  {
+    return attributes_;
+  }
+
+  fn::AttributesRef attributes() const
+  {
+    return attributes_;
+  }
+};
+
+class ParticleEmitterContext {
+ private:
+  SimulationSolveContext &solve_context_;
+  ParticleAllocators &particle_allocators_;
+  TimeInterval emit_interval_;
+
+ public:
+  ParticleEmitterContext(SimulationSolveContext &solve_context,
+                         ParticleAllocators &particle_allocators,
+                         TimeInterval emit_interval)
+      : solve_context_(solve_context),
+        particle_allocators_(particle_allocators),
+        emit_interval_(emit_interval)
+  {
+  }
+
+  template<typename StateType> StateType *lookup_state(StringRef name)
+  {
+    return solve_context_.state_map().lookup<StateType>(name);
+  }
+
+  SimulationSolveContext &solve_context()
+  {
+    return solve_context_;
+  }
+
+  ParticleAllocator *try_get_particle_allocator(StringRef particle_simulation_name)
+  {
+    return particle_allocators_.try_get_allocator(particle_simulation_name);
+  }
+
+  TimeInterval emit_interval() const
+  {
+    return emit_interval_;
+  }
+};
+
+class ParticleForceContext {
+ private:
+  SimulationSolveContext &solve_context_;
+  const ParticleChunkContext &particle_chunk_context_;
+  MutableSpan<float3> force_dst_;
+
+ public:
+  ParticleForceContext(SimulationSolveContext &solve_context,
+                       const ParticleChunkContext &particle_chunk_context,
+                       MutableSpan<float3> force_dst)
+      : solve_context_(solve_context),
+        particle_chunk_context_(particle_chunk_context),
+        force_dst_(force_dst)
+  {
+  }
+
+  SimulationSolveContext &solve_context()
+  {
+    return solve_context_;
+  }
+
+  const ParticleChunkContext &particle_chunk() const
+  {
+    return particle_chunk_context_;
+  }
+
+  MutableSpan<float3> force_dst()
+  {
+    return force_dst_;
+  }
+};
+
+}  // namespace blender::sim
+
+#endif /* __SIM_SIMULATION_SOLVER_INFLUENCES_HH__ */