1 files changed, 105 insertions, 286 deletions

diff --git a/source/blender/blenkernel/intern/particle.c b/source/blender/blenkernel/intern/particle.c
index 7602523b97c..ae6028c742a 100644
--- a/source/blender/blenkernel/intern/particle.c
+++ b/source/blender/blenkernel/intern/particle.c
@@ -78,7 +78,6 @@
 #include "BKE_library.h"
 #include "BKE_library_query.h"
 #include "BKE_library_remap.h"
-#include "BKE_depsgraph.h"
 #include "BKE_modifier.h"
 #include "BKE_mesh.h"
 #include "BKE_cdderivedmesh.h"
@@ -86,6 +85,10 @@
 #include "BKE_scene.h"
 #include "BKE_deform.h"
 
+#include "DEG_depsgraph.h"
+#include "DEG_depsgraph_build.h"
+#include "DEG_depsgraph_query.h"
+
 #include "RE_render_ext.h"
 
 #include "particle_private.h"
@@ -249,7 +252,7 @@ struct LatticeDeformData *psys_create_lattice_deform_data(ParticleSimulationData
 {
 	struct LatticeDeformData *lattice_deform_data = NULL;
 
-	if (psys_in_edit_mode(sim->scene, sim->psys) == 0) {
+	if (psys_in_edit_mode(sim->depsgraph, sim->psys) == 0) {
 		Object *lattice = NULL;
 		ModifierData *md = (ModifierData *)psys_get_modifier(sim->ob, sim->psys);
 		int mode = G.is_rendering ? eModifierMode_Render : eModifierMode_Realtime;
@@ -285,10 +288,19 @@ void psys_enable_all(Object *ob)
 	for (; psys; psys = psys->next)
 		psys->flag &= ~PSYS_DISABLED;
 }
-bool psys_in_edit_mode(Scene *scene, ParticleSystem *psys)
+
+bool psys_in_edit_mode(Depsgraph *depsgraph, ParticleSystem *psys)
 {
-	return (scene->basact && (scene->basact->object->mode & OB_MODE_PARTICLE_EDIT) && psys == psys_get_current((scene->basact)->object) && (psys->edit || psys->pointcache->edit) && !psys->renderdata);
+	ViewLayer *view_layer = DEG_get_evaluated_view_layer(depsgraph);
+	const bool use_render_params = (DEG_get_mode(depsgraph) == DAG_EVAL_RENDER);
+
+	return (view_layer->basact &&
+	        (view_layer->basact->object->mode & OB_MODE_PARTICLE_EDIT) &&
+	        psys == psys_get_current((view_layer->basact)->object) &&
+	        (psys->edit || psys->pointcache->edit) &&
+			!use_render_params);
 }
+
 bool psys_check_enabled(Object *ob, ParticleSystem *psys, const bool use_render_params)
 {
 	ParticleSystemModifierData *psmd;
@@ -297,7 +309,7 @@ bool psys_check_enabled(Object *ob, ParticleSystem *psys, const bool use_render_
 		return 0;
 
 	psmd = psys_get_modifier(ob, psys);
-	if (psys->renderdata || use_render_params) {
+	if (use_render_params) {
 		if (!(psmd->modifier.mode & eModifierMode_Render))
 			return 0;
 	}
@@ -318,18 +330,17 @@ bool psys_check_edited(ParticleSystem *psys)
 void psys_check_group_weights(ParticleSettings *part)
 {
 	ParticleDupliWeight *dw, *tdw;
-	GroupObject *go;
 	int current = 0;
 
-	if (part->ren_as == PART_DRAW_GR && part->dup_group && part->dup_group->gobject.first) {
+	if (part->ren_as == PART_DRAW_GR && part->dup_group && part->dup_group->view_layer->object_bases.first) {
 		/* First try to find NULL objects from their index,
 		 * and remove all weights that don't have an object in the group. */
 		dw = part->dupliweights.first;
 		while (dw) {
 			if (dw->ob == NULL || !BKE_group_object_exists(part->dup_group, dw->ob)) {
-				go = (GroupObject *)BLI_findlink(&part->dup_group->gobject, dw->index);
-				if (go) {
-					dw->ob = go->ob;
+				Base *base = BLI_findlink(&part->dup_group->view_layer->object_bases, dw->index);
+				if (base != NULL) {
+					dw->ob = base->object;
 				}
 				else {
 					tdw = dw->next;
@@ -343,21 +354,21 @@ void psys_check_group_weights(ParticleSettings *part)
 		}
 
 		/* then add objects in the group to new list */
-		go = part->dup_group->gobject.first;
-		while (go) {
+		FOREACH_GROUP_OBJECT_BEGIN(part->dup_group, object)
+		{
 			dw = part->dupliweights.first;
-			while (dw && dw->ob != go->ob)
+			while (dw && dw->ob != object) {
 				dw = dw->next;
-			
+			}
+
 			if (!dw) {
 				dw = MEM_callocN(sizeof(ParticleDupliWeight), "ParticleDupliWeight");
-				dw->ob = go->ob;
+				dw->ob = object;
 				dw->count = 1;
 				BLI_addtail(&part->dupliweights, dw);
 			}
-
-			go = go->next;
 		}
+		FOREACH_GROUP_OBJECT_END;
 
 		dw = part->dupliweights.first;
 		for (; dw; dw = dw->next) {
@@ -608,206 +619,10 @@ void psys_free(Object *ob, ParticleSystem *psys)
 			MEM_freeN(psys->pdd);
 		}
 
-		MEM_freeN(psys);
-	}
-}
-
-/************************************************/
-/*			Rendering							*/
-/************************************************/
-/* these functions move away particle data and bring it back after
- * rendering, to make different render settings possible without
- * removing the previous data. this should be solved properly once */
-
-void psys_render_set(Object *ob, ParticleSystem *psys, float viewmat[4][4], float winmat[4][4], int winx, int winy, int timeoffset)
-{
-	ParticleRenderData *data;
-	ParticleSystemModifierData *psmd = psys_get_modifier(ob, psys);
-
-	if (psys->renderdata)
-		return;
-
-	data = MEM_callocN(sizeof(ParticleRenderData), "ParticleRenderData");
-
-	data->child = psys->child;
-	data->totchild = psys->totchild;
-	data->pathcache = psys->pathcache;
-	data->pathcachebufs.first = psys->pathcachebufs.first;
-	data->pathcachebufs.last = psys->pathcachebufs.last;
-	data->totcached = psys->totcached;
-	data->childcache = psys->childcache;
-	data->childcachebufs.first = psys->childcachebufs.first;
-	data->childcachebufs.last = psys->childcachebufs.last;
-	data->totchildcache = psys->totchildcache;
-
-	if (psmd->dm_final) {
-		data->dm = CDDM_copy_with_tessface(psmd->dm_final);
-	}
-	data->totdmvert = psmd->totdmvert;
-	data->totdmedge = psmd->totdmedge;
-	data->totdmface = psmd->totdmface;
-
-	psys->child = NULL;
-	psys->pathcache = NULL;
-	psys->childcache = NULL;
-	psys->totchild = psys->totcached = psys->totchildcache = 0;
-	BLI_listbase_clear(&psys->pathcachebufs);
-	BLI_listbase_clear(&psys->childcachebufs);
-
-	copy_m4_m4(data->winmat, winmat);
-	mul_m4_m4m4(data->viewmat, viewmat, ob->obmat);
-	mul_m4_m4m4(data->mat, winmat, data->viewmat);
-	data->winx = winx;
-	data->winy = winy;
-
-	data->timeoffset = timeoffset;
-
-	psys->renderdata = data;
-
-	/* Hair can and has to be recalculated if everything isn't displayed. */
-	if (psys->part->disp != 100 && ELEM(psys->part->type, PART_HAIR, PART_FLUID)) {
-		psys->recalc |= PSYS_RECALC_RESET;
-	}
-}
-
-void psys_render_restore(Object *ob, ParticleSystem *psys)
-{
-	ParticleRenderData *data;
-	ParticleSystemModifierData *psmd = psys_get_modifier(ob, psys);
-	float render_disp = psys_get_current_display_percentage(psys);
-	float disp;
-
-	data = psys->renderdata;
-	if (!data)
-		return;
-	
-	if (data->elems)
-		MEM_freeN(data->elems);
-
-	if (psmd->dm_final) {
-		psmd->dm_final->needsFree = 1;
-		psmd->dm_final->release(psmd->dm_final);
-	}
-	if (psmd->dm_deformed) {
-		psmd->dm_deformed->needsFree = 1;
-		psmd->dm_deformed->release(psmd->dm_deformed);
-		psmd->dm_deformed = NULL;
-	}
-
-	psys_free_path_cache(psys, NULL);
-
-	if (psys->child) {
-		MEM_freeN(psys->child);
-		psys->child = 0;
-		psys->totchild = 0;
-	}
-
-	psys->child = data->child;
-	psys->totchild = data->totchild;
-	psys->pathcache = data->pathcache;
-	psys->pathcachebufs.first = data->pathcachebufs.first;
-	psys->pathcachebufs.last = data->pathcachebufs.last;
-	psys->totcached = data->totcached;
-	psys->childcache = data->childcache;
-	psys->childcachebufs.first = data->childcachebufs.first;
-	psys->childcachebufs.last = data->childcachebufs.last;
-	psys->totchildcache = data->totchildcache;
-
-	psmd->dm_final = data->dm;
-	psmd->totdmvert = data->totdmvert;
-	psmd->totdmedge = data->totdmedge;
-	psmd->totdmface = data->totdmface;
-	psmd->flag &= ~eParticleSystemFlag_psys_updated;
-
-	if (psmd->dm_final) {
-		if (!psmd->dm_final->deformedOnly) {
-			if (ob->derivedDeform) {
-				psmd->dm_deformed = CDDM_copy(ob->derivedDeform);
-			}
-			else {
-				psmd->dm_deformed = CDDM_from_mesh((Mesh *)ob->data);
-			}
-			DM_ensure_tessface(psmd->dm_deformed);
-		}
-		psys_calc_dmcache(ob, psmd->dm_final, psmd->dm_deformed, psys);
-	}
-
-	MEM_freeN(data);
-	psys->renderdata = NULL;
-
-	/* restore particle display percentage */
-	disp = psys_get_current_display_percentage(psys);
-
-	if (disp != render_disp) {
-		/* Hair can and has to be recalculated if everything isn't displayed. */
-		if (ELEM(psys->part->type, PART_HAIR, PART_FLUID)) {
-			psys->recalc |= PSYS_RECALC_RESET;
-		}
-		else {
-			PARTICLE_P;
-
-			LOOP_PARTICLES {
-				if (psys_frand(psys, p) > disp)
-					pa->flag |= PARS_NO_DISP;
-				else
-					pa->flag &= ~PARS_NO_DISP;
-			}
-		}
-	}
-}
-
-bool psys_render_simplify_params(ParticleSystem *psys, ChildParticle *cpa, float *params)
-{
-	ParticleRenderData *data;
-	ParticleRenderElem *elem;
-	float x, w, scale, alpha, lambda, t, scalemin, scalemax;
-	int b;
-
-	if (!(psys->renderdata && (psys->part->simplify_flag & PART_SIMPLIFY_ENABLE)))
-		return false;
-	
-	data = psys->renderdata;
-	if (!data->do_simplify)
-		return false;
-	b = (data->index_mf_to_mpoly) ? DM_origindex_mface_mpoly(data->index_mf_to_mpoly, data->index_mp_to_orig, cpa->num) : cpa->num;
-	if (b == ORIGINDEX_NONE) {
-		return false;
-	}
+		BKE_particle_batch_cache_free(psys);
 
-	elem = &data->elems[b];
-
-	lambda = elem->lambda;
-	t = elem->t;
-	scalemin = elem->scalemin;
-	scalemax = elem->scalemax;
-
-	if (!elem->reduce) {
-		scale = scalemin;
-		alpha = 1.0f;
-	}
-	else {
-		x = (elem->curchild + 0.5f) / elem->totchild;
-		if (x < lambda - t) {
-			scale = scalemax;
-			alpha = 1.0f;
-		}
-		else if (x >= lambda + t) {
-			scale = scalemin;
-			alpha = 0.0f;
-		}
-		else {
-			w = (lambda + t - x) / (2.0f * t);
-			scale = scalemin + (scalemax - scalemin) * w;
-			alpha = w;
-		}
+		MEM_freeN(psys);
 	}
-
-	params[0] = scale;
-	params[1] = alpha;
-
-	elem->curchild++;
-
-	return 1;
 }
 
 /************************************************/
@@ -1216,7 +1031,7 @@ static void interpolate_pathcache(ParticleCacheKey *first, float t, ParticleCach
 /* interpolate a location on a face based on face coordinates */
 void psys_interpolate_face(MVert *mvert, MFace *mface, MTFace *tface, float (*orcodata)[3],
                            float w[4], float vec[3], float nor[3], float utan[3], float vtan[3],
-                           float orco[3], float ornor[3])
+                           float orco[3])
 {
 	float *v1 = 0, *v2 = 0, *v3 = 0, *v4 = 0;
 	float e1[3], e2[3], s1, s2, t1, t2;
@@ -1314,21 +1129,13 @@ void psys_interpolate_face(MVert *mvert, MFace *mface, MTFace *tface, float (*or
 				o4 = orcodata[mface->v4];
 
 				interp_v3_v3v3v3v3(orco, o1, o2, o3, o4, w);
-
-				if (ornor)
-					normal_quad_v3(ornor, o1, o2, o3, o4);
 			}
 			else {
 				interp_v3_v3v3v3(orco, o1, o2, o3, w);
-
-				if (ornor)
-					normal_tri_v3(ornor, o1, o2, o3);
 			}
 		}
 		else {
 			copy_v3_v3(orco, vec);
-			if (ornor && nor)
-				copy_v3_v3(ornor, nor);
 		}
 	}
 }
@@ -1608,7 +1415,7 @@ static int psys_map_index_on_dm(DerivedMesh *dm, int from, int index, int index_
 /* interprets particle data to get a point on a mesh in object space */
 void psys_particle_on_dm(DerivedMesh *dm_final, int from, int index, int index_dmcache,
                          const float fw[4], float foffset, float vec[3], float nor[3], float utan[3], float vtan[3],
-                         float orco[3], float ornor[3])
+                         float orco[3])
 {
 	float tmpnor[3], mapfw[4];
 	float (*orcodata)[3];
@@ -1618,7 +1425,6 @@ void psys_particle_on_dm(DerivedMesh *dm_final, int from, int index, int index_d
 		if (vec) { vec[0] = vec[1] = vec[2] = 0.0; }
 		if (nor) { nor[0] = nor[1] = 0.0; nor[2] = 1.0; }
 		if (orco) { orco[0] = orco[1] = orco[2] = 0.0; }
-		if (ornor) { ornor[0] = ornor[1] = 0.0; ornor[2] = 1.0; }
 		if (utan) { utan[0] = utan[1] = utan[2] = 0.0; }
 		if (vtan) { vtan[0] = vtan[1] = vtan[2] = 0.0; }
 
@@ -1644,11 +1450,6 @@ void psys_particle_on_dm(DerivedMesh *dm_final, int from, int index, int index_d
 			}
 		}
 
-		if (ornor) {
-			dm_final->getVertNo(dm_final, mapindex, ornor);
-			normalize_v3(ornor);
-		}
-
 		if (utan && vtan) {
 			utan[0] = utan[1] = utan[2] = 0.0f;
 			vtan[0] = vtan[1] = vtan[2] = 0.0f;
@@ -1667,7 +1468,7 @@ void psys_particle_on_dm(DerivedMesh *dm_final, int from, int index, int index_d
 			mtface += mapindex;
 
 		if (from == PART_FROM_VOLUME) {
-			psys_interpolate_face(mvert, mface, mtface, orcodata, mapfw, vec, tmpnor, utan, vtan, orco, ornor);
+			psys_interpolate_face(mvert, mface, mtface, orcodata, mapfw, vec, tmpnor, utan, vtan, orco);
 			if (nor)
 				copy_v3_v3(nor, tmpnor);
 
@@ -1676,7 +1477,7 @@ void psys_particle_on_dm(DerivedMesh *dm_final, int from, int index, int index_d
 			add_v3_v3(vec, tmpnor);
 		}
 		else
-			psys_interpolate_face(mvert, mface, mtface, orcodata, mapfw, vec, nor, utan, vtan, orco, ornor);
+			psys_interpolate_face(mvert, mface, mtface, orcodata, mapfw, vec, nor, utan, vtan, orco);
 	}
 }
 
@@ -1712,7 +1513,7 @@ ParticleSystemModifierData *psys_get_modifier(Object *ob, ParticleSystem *psys)
 /* ready for future use */
 static void psys_particle_on_shape(int UNUSED(distr), int UNUSED(index),
                                    float *UNUSED(fuv), float vec[3], float nor[3], float utan[3], float vtan[3],
-                                   float orco[3], float ornor[3])
+                                   float orco[3])
 {
 	/* TODO */
 	float zerovec[3] = {0.0f, 0.0f, 0.0f};
@@ -1731,9 +1532,6 @@ static void psys_particle_on_shape(int UNUSED(distr), int UNUSED(index),
 	if (orco) {
 		copy_v3_v3(orco, zerovec);
 	}
-	if (ornor) {
-		copy_v3_v3(ornor, zerovec);
-	}
 }
 /************************************************/
 /*			Particles on emitter				*/
@@ -1776,7 +1574,7 @@ CustomDataMask psys_emitter_customdata_mask(ParticleSystem *psys)
 
 void psys_particle_on_emitter(ParticleSystemModifierData *psmd, int from, int index, int index_dmcache,
                               float fuv[4], float foffset, float vec[3], float nor[3], float utan[3], float vtan[3],
-                              float orco[3], float ornor[3])
+                              float orco[3])
 {
 	if (psmd && psmd->dm_final) {
 		if (psmd->psys->part->distr == PART_DISTR_GRID && psmd->psys->part->from != PART_FROM_VERT) {
@@ -1788,10 +1586,10 @@ void psys_particle_on_emitter(ParticleSystemModifierData *psmd, int from, int in
 			return;
 		}
 		/* we cant use the num_dmcache */
-		psys_particle_on_dm(psmd->dm_final, from, index, index_dmcache, fuv, foffset, vec, nor, utan, vtan, orco, ornor);
+		psys_particle_on_dm(psmd->dm_final, from, index, index_dmcache, fuv, foffset, vec, nor, utan, vtan, orco);
 	}
 	else
-		psys_particle_on_shape(from, index, fuv, vec, nor, utan, vtan, orco, ornor);
+		psys_particle_on_shape(from, index, fuv, vec, nor, utan, vtan, orco);
 
 }
 /************************************************/
@@ -1813,7 +1611,7 @@ void precalc_guides(ParticleSimulationData *sim, ListBase *effectors)
 		return;
 
 	LOOP_PARTICLES {
-		psys_particle_on_emitter(sim->psmd, sim->psys->part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, state.co, 0, 0, 0, 0, 0);
+		psys_particle_on_emitter(sim->psmd, sim->psys->part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, state.co, 0, 0, 0, 0);
 		
 		mul_m4_v3(sim->ob->obmat, state.co);
 		mul_mat3_m4_v3(sim->ob->obmat, state.vel);
@@ -1839,7 +1637,7 @@ void precalc_guides(ParticleSimulationData *sim, ListBase *effectors)
 	}
 }
 
-int do_guides(ParticleSettings *part, ListBase *effectors, ParticleKey *state, int index, float time)
+int do_guides(Depsgraph *depsgraph, ParticleSettings *part, ListBase *effectors, ParticleKey *state, int index, float time)
 {
 	CurveMapping *clumpcurve = (part->child_flag & PART_CHILD_USE_CLUMP_CURVE) ? part->clumpcurve : NULL;
 	CurveMapping *roughcurve = (part->child_flag & PART_CHILD_USE_ROUGH_CURVE) ? part->roughcurve : NULL;
@@ -1902,7 +1700,7 @@ int do_guides(ParticleSettings *part, ListBase *effectors, ParticleKey *state, i
 		
 		/* curve taper */
 		if (cu->taperobj)
-			mul_v3_fl(vec_to_point, BKE_displist_calc_taper(eff->scene, cu->taperobj, (int)(data->strength * guidetime * 100.0f), 100));
+			mul_v3_fl(vec_to_point, BKE_displist_calc_taper(depsgraph, eff->scene, cu->taperobj, (int)(data->strength * guidetime * 100.0f), 100));
 		
 		else { /* curve size*/
 			if (cu->flag & CU_PATH_RADIUS) {
@@ -2041,7 +1839,7 @@ void psys_find_parents(ParticleSimulationData *sim, const bool use_render_params
 	int from = PART_FROM_FACE;
 	totparent = (int)(totchild * part->parents * 0.3f);
 
-	if ((sim->psys->renderdata || use_render_params) && part->child_nbr && part->ren_child_nbr)
+	if (use_render_params && part->child_nbr && part->ren_child_nbr)
 		totparent *= (float)part->child_nbr / (float)part->ren_child_nbr;
 
 	/* hard limit, workaround for it being ignored above */
@@ -2052,7 +1850,7 @@ void psys_find_parents(ParticleSimulationData *sim, const bool use_render_params
 	tree = BLI_kdtree_new(totparent);
 
 	for (p = 0, cpa = sim->psys->child; p < totparent; p++, cpa++) {
-		psys_particle_on_emitter(sim->psmd, from, cpa->num, DMCACHE_ISCHILD, cpa->fuv, cpa->foffset, co, 0, 0, 0, orco, 0);
+		psys_particle_on_emitter(sim->psmd, from, cpa->num, DMCACHE_ISCHILD, cpa->fuv, cpa->foffset, co, 0, 0, 0, orco);
 
 		/* Check if particle doesn't exist because of texture influence. Insert only existing particles into kdtree. */
 		get_cpa_texture(sim->psmd->dm_final, psys, part, psys->particles + cpa->pa[0], p, cpa->num, cpa->fuv, orco, &ptex, PAMAP_DENS | PAMAP_CHILD, psys->cfra);
@@ -2065,7 +1863,7 @@ void psys_find_parents(ParticleSimulationData *sim, const bool use_render_params
 	BLI_kdtree_balance(tree);
 
 	for (; p < totchild; p++, cpa++) {
-		psys_particle_on_emitter(sim->psmd, from, cpa->num, DMCACHE_ISCHILD, cpa->fuv, cpa->foffset, co, 0, 0, 0, orco, 0);
+		psys_particle_on_emitter(sim->psmd, from, cpa->num, DMCACHE_ISCHILD, cpa->fuv, cpa->foffset, co, 0, 0, 0, orco);
 		cpa->parent = BLI_kdtree_find_nearest(tree, orco, NULL);
 	}
 
@@ -2085,10 +1883,10 @@ static bool psys_thread_context_init_path(
 	psys_thread_context_init(ctx, sim);
 
 	/*---start figuring out what is actually wanted---*/
-	if (psys_in_edit_mode(scene, psys)) {
+	if (psys_in_edit_mode(sim->depsgraph, psys)) {
 		ParticleEditSettings *pset = &scene->toolsettings->particle;
 
-		if ((psys->renderdata == 0 && use_render_params == 0) && (psys->edit == NULL || pset->flag & PE_DRAW_PART) == 0)
+		if ((use_render_params == 0) && (psys->edit == NULL || pset->flag & PE_DRAW_PART) == 0)
 			totchild = 0;
 
 		segments = 1 << pset->draw_step;
@@ -2097,14 +1895,14 @@ static bool psys_thread_context_init_path(
 	if (totchild && part->childtype == PART_CHILD_FACES) {
 		totparent = (int)(totchild * part->parents * 0.3f);
 		
-		if ((psys->renderdata || use_render_params) && part->child_nbr && part->ren_child_nbr)
+		if (use_render_params && part->child_nbr && part->ren_child_nbr)
 			totparent *= (float)part->child_nbr / (float)part->ren_child_nbr;
 
 		/* part->parents could still be 0 so we can't test with totparent */
 		between = 1;
 	}
 
-	if (psys->renderdata || use_render_params)
+	if (use_render_params)
 		segments = 1 << part->ren_step;
 	else {
 		totchild = (int)((float)totchild * (float)part->disp / 100.0f);
@@ -2182,11 +1980,11 @@ static void psys_thread_create_path(ParticleTask *task, struct ChildParticle *cp
 	ParticleSystem *psys = ctx->sim.psys;
 	ParticleSettings *part = psys->part;
 	ParticleCacheKey **cache = psys->childcache;
-	ParticleCacheKey **pcache = psys_in_edit_mode(ctx->sim.scene, psys) && psys->edit ? psys->edit->pathcache : psys->pathcache;
+	ParticleCacheKey **pcache = psys_in_edit_mode(ctx->sim.depsgraph, psys) && psys->edit ? psys->edit->pathcache : psys->pathcache;
 	ParticleCacheKey *child, *key[4];
 	ParticleTexture ptex;
 	float *cpa_fuv = 0, *par_rot = 0, rot[4];
-	float orco[3], ornor[3], hairmat[4][4], dvec[3], off1[4][3], off2[4][3];
+	float orco[3], hairmat[4][4], dvec[3], off1[4][3], off2[4][3];
 	float eff_length, eff_vec[3], weight[4];
 	int k, cpa_num;
 	short cpa_from;
@@ -2282,7 +2080,7 @@ static void psys_thread_create_path(ParticleTask *task, struct ChildParticle *cp
 		cpa_fuv = cpa->fuv;
 		cpa_from = PART_FROM_FACE;
 
-		psys_particle_on_emitter(ctx->sim.psmd, cpa_from, cpa_num, DMCACHE_ISCHILD, cpa->fuv, foffset, co, ornor, 0, 0, orco, 0);
+		psys_particle_on_emitter(ctx->sim.psmd, cpa_from, cpa_num, DMCACHE_ISCHILD, cpa->fuv, foffset, co, 0, 0, orco, 0);
 
 		mul_m4_v3(ob->obmat, co);
 
@@ -2324,7 +2122,7 @@ static void psys_thread_create_path(ParticleTask *task, struct ChildParticle *cp
 			cpa_num = 0;
 		cpa_fuv = pa->fuv;
 
-		psys_particle_on_emitter(ctx->sim.psmd, cpa_from, cpa_num, DMCACHE_ISCHILD, cpa_fuv, pa->foffset, co, ornor, 0, 0, orco, 0);
+		psys_particle_on_emitter(ctx->sim.psmd, cpa_from, cpa_num, DMCACHE_ISCHILD, cpa_fuv, pa->foffset, co, 0, 0, orco, 0);
 
 		psys_mat_hair_to_global(ob, ctx->sim.psmd->dm_final, psys->part->from, pa, hairmat);
 	}
@@ -2432,9 +2230,9 @@ static void psys_thread_create_path(ParticleTask *task, struct ChildParticle *cp
 			BLI_listbase_clear(&modifiers);
 			
 			psys_particle_on_emitter(ctx->sim.psmd, part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset,
-			                         par_co, NULL, NULL, NULL, par_orco, NULL);
+			                         par_co, NULL, NULL, NULL, par_orco);
 			
-			psys_apply_child_modifiers(ctx, &modifiers, cpa, &ptex, orco, ornor, hairmat, child_keys, par, par_orco);
+			psys_apply_child_modifiers(ctx, &modifiers, cpa, &ptex, orco, hairmat, child_keys, par, par_orco);
 		}
 		else
 			zero_v3(par_orco);
@@ -2571,7 +2369,9 @@ static void cache_key_incremental_rotation(ParticleCacheKey *key0, ParticleCache
 void psys_cache_paths(ParticleSimulationData *sim, float cfra, const bool use_render_params)
 {
 	PARTICLE_PSMD;
+#if 0
 	ParticleEditSettings *pset = &sim->scene->toolsettings->particle;
+#endif
 	ParticleSystem *psys = sim->psys;
 	ParticleSettings *part = psys->part;
 	ParticleCacheKey *ca, **cache;
@@ -2592,7 +2392,7 @@ void psys_cache_paths(ParticleSimulationData *sim, float cfra, const bool use_re
 	float prev_tangent[3] = {0.0f, 0.0f, 0.0f}, hairmat[4][4];
 	float rotmat[3][3];
 	int k;
-	int segments = (int)pow(2.0, (double)((psys->renderdata || use_render_params) ? part->ren_step : part->draw_step));
+	int segments = (int)pow(2.0, (double)((use_render_params) ? part->ren_step : part->draw_step));
 	int totpart = psys->totpart;
 	float length, vec[3];
 	float *vg_effector = NULL;
@@ -2603,9 +2403,11 @@ void psys_cache_paths(ParticleSimulationData *sim, float cfra, const bool use_re
 	if ((psys->flag & PSYS_HAIR_DONE || psys->flag & PSYS_KEYED || psys->pointcache) == 0)
 		return;
 
-	if (psys_in_edit_mode(sim->scene, psys))
-		if (psys->renderdata == 0 && (psys->edit == NULL || pset->flag & PE_DRAW_PART) == 0)
+#if 0 /* TODO(mai): something is very wrong with these conditionals, they dont make sense and the cache isnt updating */
+	if (psys_in_edit_mode(sim->depsgraph, psys))
+		if ((psys->edit == NULL || pset->flag & PE_DRAW_PART) == 0)
 			return;
+#endif
 
 	keyed = psys->flag & PSYS_KEYED;
 	baked = psys->pointcache->mem_cache.first && psys->part->type != PART_HAIR;
@@ -2723,7 +2525,7 @@ void psys_cache_paths(ParticleSimulationData *sim, float cfra, const bool use_re
 			if (sim->psys->effectors && (psys->part->flag & PART_CHILD_EFFECT) == 0) {
 				for (k = 0, ca = cache[p]; k <= segments; k++, ca++)
 					/* ca is safe to cast, since only co and vel are used */
-					do_guides(sim->psys->part, sim->psys->effectors, (ParticleKey *)ca, p, (float)k / (float)segments);
+					do_guides(sim->depsgraph, sim->psys->part, sim->psys->effectors, (ParticleKey *)ca, p, (float)k / (float)segments);
 			}
 
 			/* lattices have to be calculated separately to avoid mixups between effector calculations */
@@ -2771,7 +2573,7 @@ void psys_cache_paths(ParticleSimulationData *sim, float cfra, const bool use_re
 	if (vg_length)
 		MEM_freeN(vg_length);
 }
-void psys_cache_edit_paths(Scene *scene, Object *ob, PTCacheEdit *edit, float cfra, const bool use_render_params)
+void psys_cache_edit_paths(Depsgraph *depsgraph, Scene *scene, Object *ob, PTCacheEdit *edit, float cfra, const bool use_render_params)
 {
 	ParticleCacheKey *ca, **cache = edit->pathcache;
 	ParticleEditSettings *pset = &scene->toolsettings->particle;
@@ -2799,7 +2601,7 @@ void psys_cache_edit_paths(Scene *scene, Object *ob, PTCacheEdit *edit, float cf
 
 	if (!cache || edit->totpoint != edit->totcached) {
 		/* clear out old and create new empty path cache */
-		psys_free_path_cache(edit->psys, edit);
+		psys_free_path_cache(NULL, edit);
 		cache = edit->pathcache = psys_alloc_path_cache_buffers(&edit->pathcachebufs, totpart, segments + 1);
 
 		/* set flag for update (child particles check this too) */
@@ -2972,6 +2774,7 @@ void psys_cache_edit_paths(Scene *scene, Object *ob, PTCacheEdit *edit, float cf
 
 	if (psys) {
 		ParticleSimulationData sim = {0};
+		sim.depsgraph = depsgraph;
 		sim.scene = scene;
 		sim.ob = ob;
 		sim.psys = psys;
@@ -3108,7 +2911,7 @@ void psys_mat_hair_to_object(Object *UNUSED(ob), DerivedMesh *dm, short from, Pa
 	}
 	
 	psys_face_mat(0, dm, pa, hairmat, 0);
-	psys_particle_on_dm(dm, from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, vec, 0, 0, 0, 0, 0);
+	psys_particle_on_dm(dm, from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, vec, 0, 0, 0, 0);
 	copy_v3_v3(hairmat[3], vec);
 }
 
@@ -3117,7 +2920,7 @@ void psys_mat_hair_to_orco(Object *ob, DerivedMesh *dm, short from, ParticleData
 	float vec[3], orco[3];
 
 	psys_face_mat(ob, dm, pa, hairmat, 1);
-	psys_particle_on_dm(dm, from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, vec, 0, 0, 0, orco, 0);
+	psys_particle_on_dm(dm, from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, vec, 0, 0, 0, orco);
 
 	/* see psys_face_mat for why this function is called */
 	if (DM_get_vert_data_layer(dm, CD_ORIGINDEX))
@@ -3186,8 +2989,8 @@ ModifierData *object_add_particle_system(Scene *scene, Object *ob, const char *n
 	psys->flag = PSYS_CURRENT;
 	psys->cfra = BKE_scene_frame_get_from_ctime(scene, CFRA + 1);
 
-	DAG_relations_tag_update(G.main);
-	DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
+	DEG_relations_tag_update(G.main);
+	DEG_id_tag_update(&ob->id, OB_RECALC_DATA);
 
 	return md;
 }
@@ -3232,8 +3035,8 @@ void object_remove_particle_system(Scene *UNUSED(scene), Object *ob)
 	else
 		ob->mode &= ~OB_MODE_PARTICLE_EDIT;
 
-	DAG_relations_tag_update(G.main);
-	DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
+	DEG_relations_tag_update(G.main);
+	DEG_id_tag_update(&ob->id, OB_RECALC_DATA);
 }
 
 static void default_particle_settings(ParticleSettings *part)
@@ -3296,7 +3099,7 @@ static void default_particle_settings(ParticleSettings *part)
 	part->clength = 1.0f;
 	part->clength_thres = 0.0f;
 
-	part->draw = PART_DRAW_EMITTER;
+	part->draw = 0;
 	part->draw_line[0] = 0.5;
 	part->path_start = 0.0f;
 	part->path_end = 1.0f;
@@ -3308,16 +3111,12 @@ static void default_particle_settings(ParticleSettings *part)
 	part->color_vec_max = 1.f;
 	part->draw_col = PART_DRAW_COL_MAT;
 
-	part->simplify_refsize = 1920;
-	part->simplify_rate = 1.0f;
-	part->simplify_transition = 0.1f;
-	part->simplify_viewport = 0.8;
-
 	if (!part->effector_weights)
 		part->effector_weights = BKE_add_effector_weights(NULL);
 
 	part->omat = 1;
 	part->use_modifier_stack = false;
+	part->draw_size = 0.1f;
 }
 
 
@@ -3626,7 +3425,7 @@ void psys_get_texture(ParticleSimulationData *sim, ParticleData *pa, ParticleTex
 					/* no break, failed to get uv's, so let's try orco's */
 					ATTR_FALLTHROUGH;
 				case TEXCO_ORCO:
-					psys_particle_on_emitter(sim->psmd, sim->psys->part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, co, 0, 0, 0, texvec, 0);
+					psys_particle_on_emitter(sim->psmd, sim->psys->part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, co, 0, 0, 0, texvec);
 					
 					if (me->bb == NULL || (me->bb->flag & BOUNDBOX_DIRTY)) {
 						BKE_mesh_texspace_calc(me);
@@ -3822,7 +3621,7 @@ void psys_get_particle_on_path(ParticleSimulationData *sim, int p, ParticleKey *
 			pind.bspline = (psys->part->flag & PART_HAIR_BSPLINE);
 			/* pind.dm disabled in editmode means we don't get effectors taken into
 			 * account when subdividing for instance */
-			pind.dm = psys_in_edit_mode(sim->scene, psys) ? NULL : psys->hair_out_dm;
+			pind.dm = psys_in_edit_mode(sim->depsgraph, psys) ? NULL : psys->hair_out_dm;
 			init_particle_interpolation(sim->ob, psys, pa, &pind);
 			do_particle_interpolation(psys, p, pa, t, &pind, state);
 
@@ -3837,7 +3636,7 @@ void psys_get_particle_on_path(ParticleSimulationData *sim, int p, ParticleKey *
 					mul_mat3_m4_v3(hairmat, state->vel);
 
 					if (sim->psys->effectors && (part->flag & PART_CHILD_GUIDE) == 0) {
-						do_guides(sim->psys->part, sim->psys->effectors, state, p, state->time);
+						do_guides(sim->depsgraph, sim->psys->part, sim->psys->effectors, state, p, state->time);
 						/* TODO: proper velocity handling */
 					}
 
@@ -3888,7 +3687,7 @@ void psys_get_particle_on_path(ParticleSimulationData *sim, int p, ParticleKey *
 				cpa_fuv = cpa->fuv;
 				cpa_from = PART_FROM_FACE;
 
-				psys_particle_on_emitter(psmd, cpa_from, cpa_num, DMCACHE_ISCHILD, cpa->fuv, foffset, co, 0, 0, 0, orco, 0);
+				psys_particle_on_emitter(psmd, cpa_from, cpa_num, DMCACHE_ISCHILD, cpa->fuv, foffset, co, 0, 0, 0, orco);
 
 				/* we need to save the actual root position of the child for positioning it accurately to the surface of the emitter */
 				//copy_v3_v3(cpa_1st, co);
@@ -3897,7 +3696,7 @@ void psys_get_particle_on_path(ParticleSimulationData *sim, int p, ParticleKey *
 
 				pa = psys->particles + cpa->parent;
 
-				psys_particle_on_emitter(psmd, part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, par_co, 0, 0, 0, par_orco, 0);
+				psys_particle_on_emitter(psmd, part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, par_co, 0, 0, 0, par_orco);
 				if (part->type == PART_HAIR)
 					psys_mat_hair_to_global(sim->ob, sim->psmd->dm_final, psys->part->from, pa, hairmat);
 				else
@@ -3917,9 +3716,9 @@ void psys_get_particle_on_path(ParticleSimulationData *sim, int p, ParticleKey *
 				cpa_num = pa->num;
 				cpa_fuv = pa->fuv;
 
-				psys_particle_on_emitter(psmd, part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, par_co, 0, 0, 0, par_orco, 0);
+				psys_particle_on_emitter(psmd, part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, par_co, 0, 0, 0, par_orco);
 				if (part->type == PART_HAIR) {
-					psys_particle_on_emitter(psmd, cpa_from, cpa_num, DMCACHE_ISCHILD, cpa_fuv, pa->foffset, co, 0, 0, 0, orco, 0);
+					psys_particle_on_emitter(psmd, cpa_from, cpa_num, DMCACHE_ISCHILD, cpa_fuv, pa->foffset, co, 0, 0, 0, orco);
 					psys_mat_hair_to_global(sim->ob, sim->psmd->dm_final, psys->part->from, pa, hairmat);
 				}
 				else {
@@ -4204,7 +4003,7 @@ void psys_get_dupli_texture(ParticleSystem *psys, ParticleSettings *part,
 				psys_interpolate_uvs(mtface, mface->v4, cpa->fuv, uv);
 			}
 		
-			psys_particle_on_emitter(psmd, PART_FROM_FACE, cpa->num, DMCACHE_ISCHILD, cpa->fuv, cpa->foffset, loc, 0, 0, 0, orco, 0);
+			psys_particle_on_emitter(psmd, PART_FROM_FACE, cpa->num, DMCACHE_ISCHILD, cpa->fuv, cpa->foffset, loc, 0, 0, 0, orco);
 			return;
 		}
 		else {
@@ -4235,7 +4034,7 @@ void psys_get_dupli_texture(ParticleSystem *psys, ParticleSettings *part,
 		}
 	}
 
-	psys_particle_on_emitter(psmd, part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, loc, 0, 0, 0, orco, 0);
+	psys_particle_on_emitter(psmd, part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, loc, 0, 0, 0, orco);
 }
 
 void psys_get_dupli_path_transform(ParticleSimulationData *sim, ParticleData *pa, ChildParticle *cpa, ParticleCacheKey *cache, float mat[4][4], float *scale)
@@ -4253,9 +4052,9 @@ void psys_get_dupli_path_transform(ParticleSimulationData *sim, ParticleData *pa
 		pa = psys->particles + cpa->pa[0];
 
 	if (pa)
-		psys_particle_on_emitter(psmd, sim->psys->part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, loc, nor, 0, 0, 0, 0);
+		psys_particle_on_emitter(psmd, sim->psys->part->from, pa->num, pa->num_dmcache, pa->fuv, pa->foffset, loc, nor, 0, 0, 0);
 	else
-		psys_particle_on_emitter(psmd, PART_FROM_FACE, cpa->num, DMCACHE_ISCHILD, cpa->fuv, cpa->foffset, loc, nor, 0, 0, 0, 0);
+		psys_particle_on_emitter(psmd, PART_FROM_FACE, cpa->num, DMCACHE_ISCHILD, cpa->fuv, cpa->foffset, loc, nor, 0, 0, 0);
 
 	if (psys->part->rotmode == PART_ROT_VEL) {
 		transpose_m3_m4(nmat, ob->imat);
@@ -4387,9 +4186,10 @@ void psys_make_billboard(ParticleBillboardData *bb, float xvec[3], float yvec[3]
 	madd_v3_v3fl(center, yvec, bb->offset[1]);
 }
 
-void psys_apply_hair_lattice(Scene *scene, Object *ob, ParticleSystem *psys)
+void psys_apply_hair_lattice(Depsgraph *depsgraph, Scene *scene, Object *ob, ParticleSystem *psys)
 {
 	ParticleSimulationData sim = {0};
+	sim.depsgraph = depsgraph;
 	sim.scene = scene;
 	sim.ob = ob;
 	sim.psys = psys;
@@ -4422,3 +4222,22 @@ void psys_apply_hair_lattice(Scene *scene, Object *ob, ParticleSystem *psys)
 		psys->flag |= PSYS_EDITED;
 	}
 }
+
+
+
+/* Draw Engine */
+void (*BKE_particle_batch_cache_dirty_cb)(ParticleSystem *psys, int mode) = NULL;
+void (*BKE_particle_batch_cache_free_cb)(ParticleSystem *psys) = NULL;
+
+void BKE_particle_batch_cache_dirty(ParticleSystem *psys, int mode)
+{
+	if (psys->batch_cache) {
+		BKE_particle_batch_cache_dirty_cb(psys, mode);
+	}
+}
+void BKE_particle_batch_cache_free(ParticleSystem *psys)
+{
+	if (psys->batch_cache) {
+		BKE_particle_batch_cache_free_cb(psys);
+	}
+}