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diff --git a/source/blender/simulation/intern/simulation_solver_influences.hh b/source/blender/simulation/intern/simulation_solver_influences.hh
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+++ b/source/blender/simulation/intern/simulation_solver_influences.hh
@@ -0,0 +1,194 @@
+/*
+ * 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_float4x4.hh"
+#include "BLI_multi_value_map.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 {
+
+using fn::AttributesInfo;
+using fn::AttributesInfoBuilder;
+using fn::AttributesRef;
+using fn::CPPType;
+using fn::GMutableSpan;
+using fn::GSpan;
+using fn::MutableAttributesRef;
+
+class ParticleEmitterContext;
+class ParticleForceContext;
+class ParticleActionContext;
+
+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;
+};
+
+class ParticleAction {
+ public:
+  virtual ~ParticleAction();
+  virtual void execute(ParticleActionContext &context) const = 0;
+};
+
+struct SimulationInfluences {
+  MultiValueMap<std::string, const ParticleForce *> particle_forces;
+  MultiValueMap<std::string, const ParticleAction *> particle_birth_actions;
+  MultiValueMap<std::string, const ParticleAction *> particle_time_step_begin_actions;
+  MultiValueMap<std::string, const ParticleAction *> particle_time_step_end_actions;
+  Map<std::string, AttributesInfoBuilder *> particle_attributes_builder;
+  Vector<const ParticleEmitter *> particle_emitters;
+};
+
+class SimulationStateMap {
+ private:
+  Map<StringRefNull, SimulationState *> states_by_name_;
+  MultiValueMap<StringRefNull, SimulationState *> states_by_type_;
+
+ public:
+  void add(SimulationState *state)
+  {
+    states_by_name_.add_new(state->name, state);
+    states_by_type_.add(state->type, 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
+  {
+    return states_by_type_.lookup_as(type);
+  }
+};
+
+class DependencyAnimations {
+ public:
+  ~DependencyAnimations();
+
+  virtual bool is_object_transform_changing(Object &object) const;
+  virtual void get_object_transforms(Object &object,
+                                     Span<float> simulation_times,
+                                     MutableSpan<float4x4> r_transforms) const;
+};
+
+struct SimulationSolveContext {
+  Simulation &simulation;
+  Depsgraph &depsgraph;
+  const SimulationInfluences &influences;
+  TimeInterval solve_interval;
+  const SimulationStateMap &state_map;
+  const bke::PersistentDataHandleMap &handle_map;
+  const DependencyAnimations &dependency_animations;
+};
+
+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;
+    }
+  }
+};
+
+struct ParticleChunkContext {
+  IndexMask index_mask;
+  MutableAttributesRef attributes;
+};
+
+struct ParticleEmitterContext {
+  SimulationSolveContext &solve_context;
+  ParticleAllocators &particle_allocators;
+  TimeInterval emit_interval;
+
+  template<typename StateType> StateType *lookup_state(StringRef name)
+  {
+    return solve_context.state_map.lookup<StateType>(name);
+  }
+
+  ParticleAllocator *try_get_particle_allocator(StringRef particle_simulation_name)
+  {
+    return particle_allocators.try_get_allocator(particle_simulation_name);
+  }
+};
+
+struct ParticleForceContext {
+  SimulationSolveContext &solve_context;
+  ParticleChunkContext &particles;
+  MutableSpan<float3> force_dst;
+};
+
+struct ParticleActionContext {
+  SimulationSolveContext &solve_context;
+  ParticleChunkContext &particles;
+};
+
+}  // namespace blender::sim
+
+#endif /* __SIM_SIMULATION_SOLVER_INFLUENCES_HH__ */