Particle system: Move runtime data to runtime field

Allows it to be preserved during copy-on-write update when on-geometry
related update is needed.

This is a required part for T63537, where we need to preserve the entire
evaluation data when object is tagged for only RECALC_COPY_ON_WRITE.

Reviewers: brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5023

1 files changed, 11 insertions, 6 deletions

diff --git a/source/blender/blenkernel/intern/particle_system.c b/source/blender/blenkernel/intern/particle_system.c
index 27722aab2d9..1b0655c6734 100644
--- a/source/blender/blenkernel/intern/particle_system.c
+++ b/source/blender/blenkernel/intern/particle_system.c
@@ -467,7 +467,7 @@ void psys_thread_context_init(ParticleThreadContext *ctx, ParticleSimulationData
 {
   memset(ctx, 0, sizeof(ParticleThreadContext));
   ctx->sim = *sim;
-  ctx->mesh = ctx->sim.psmd->mesh_final;
+  ctx->mesh = BKE_particle_modifier_mesh_final_get(ctx->sim.psmd);
   ctx->ma = give_current_material(sim->ob, sim->psys->part->omat);
 }
 
@@ -3348,6 +3348,7 @@ static void hair_create_input_mesh(ParticleSimulationData *sim,
 
   /* make vgroup for pin roots etc.. */
   hair_index = 1;
+  Mesh *mesh_final = BKE_particle_modifier_mesh_final_get(sim->psmd);
   LOOP_PARTICLES
   {
     if (!(pa->flag & PARS_UNEXIST)) {
@@ -3358,7 +3359,7 @@ static void hair_create_input_mesh(ParticleSimulationData *sim,
       pa->hair_index = hair_index;
       use_hair = psys_hair_use_simulation(pa, max_length);
 
-      psys_mat_hair_to_object(sim->ob, sim->psmd->mesh_final, psys->part->from, pa, hairmat);
+      psys_mat_hair_to_object(sim->ob, mesh_final, psys->part->from, pa, hairmat);
       mul_m4_m4m4(root_mat, sim->ob->obmat, hairmat);
       normalize_m4(root_mat);
 
@@ -3524,7 +3525,9 @@ static void hair_step(ParticleSimulationData *sim, float cfra, const bool use_re
 
   if (psys->recalc & ID_RECALC_PSYS_RESET) {
     /* need this for changing subsurf levels */
-    psys_calc_dmcache(sim->ob, sim->psmd->mesh_final, sim->psmd->mesh_original, psys);
+    Mesh *mesh_final = BKE_particle_modifier_mesh_final_get(sim->psmd);
+    Mesh *mesh_original = BKE_particle_modifier_mesh_original_get(sim->psmd);
+    psys_calc_dmcache(sim->ob, mesh_final, mesh_original, psys);
 
     if (psys->clmd) {
       cloth_free_modifier(psys->clmd);
@@ -3576,7 +3579,8 @@ static void save_hair(ParticleSimulationData *sim, float UNUSED(cfra))
 
     if (pa->totkey) {
       sub_v3_v3(key->co, root->co);
-      psys_vec_rot_to_face(sim->psmd->mesh_final, pa, key->co);
+      Mesh *mesh_final = BKE_particle_modifier_mesh_final_get(sim->psmd);
+      psys_vec_rot_to_face(mesh_final, pa, key->co);
     }
 
     key->time = pa->state.time;
@@ -4610,12 +4614,13 @@ void particle_system_update(struct Depsgraph *depsgraph,
     }
   }
 
-  if (!sim.psmd->mesh_final) {
+  Mesh *mesh_final = BKE_particle_modifier_mesh_final_get(sim.psmd);
+  if (!mesh_final) {
     return;
   }
 
   if (part->from != PART_FROM_VERT) {
-    BKE_mesh_tessface_ensure(sim.psmd->mesh_final);
+    BKE_mesh_tessface_ensure(mesh_final);
   }
 
   /* to verify if we need to restore object afterwards */