Particle edit: Make visibility check to be per-particle system

This way we can see other particle systems while combing another one.

source/blender/draw/engines/basic/basic_engine.c

@@ -140,32 +140,29 @@ static void basic_cache_populate(void *vedata, Object *ob)
 {
 	BASIC_StorageList *stl = ((BASIC_Data *)vedata)->stl;
 
-	if (!DRW_object_is_renderable(ob))
+	if (!DRW_object_is_renderable(ob)) {
-		return;
-
-	if (!DRW_check_particles_visible_within_active_context(ob)) {
 		return;
 	}
 
 	const DRWContextState *draw_ctx = DRW_context_state_get();
-
+	if (ob == draw_ctx->object_edit) {
-	if (ob != draw_ctx->object_edit) {
+		return;
-		for (ParticleSystem *psys = ob->particlesystem.first; psys; psys = psys->next) {
-			if (psys_check_enabled(ob, psys, false)) {
-				ParticleSettings *part = psys->part;
-				int draw_as = (part->draw_as == PART_DRAW_REND) ? part->ren_as : part->draw_as;
-
-				if (draw_as == PART_DRAW_PATH && !psys->pathcache && !psys->childcache) {
-					draw_as = PART_DRAW_DOT;
 	}
 
+	for (ParticleSystem *psys = ob->particlesystem.first; psys; psys = psys->next) {
+		if (!psys_check_enabled(ob, psys, false)) {
+			continue;
+		}
+		if (!DRW_check_psys_visible_within_active_context(ob, psys)) {
+			return;
+		}
+		ParticleSettings *part = psys->part;
+		const int draw_as = (part->draw_as == PART_DRAW_REND) ? part->ren_as : part->draw_as;
 		if (draw_as == PART_DRAW_PATH) {
 			struct Gwn_Batch *hairs = DRW_cache_particles_get_hair(psys, NULL);
 			DRW_shgroup_call_add(stl->g_data->depth_shgrp, hairs, NULL);
 		}
 	}
-		}
-	}
 
 	struct Gwn_Batch *geom = DRW_cache_object_surface_get(ob);
 	if (geom) {

source/blender/draw/engines/clay/clay_engine.c

@@ -833,21 +833,15 @@ static void clay_cache_populate_particles(void *vedata, Object *ob)
 		return;
 	}
 
-	if (!DRW_check_particles_visible_within_active_context(ob)) {
-		return;
-	}
-
 	for (ParticleSystem *psys = ob->particlesystem.first; psys; psys = psys->next) {
 		if (!psys_check_enabled(ob, psys, false)) {
 			continue;
 		}
-		ParticleSettings *part = psys->part;
+		if (!DRW_check_psys_visible_within_active_context(ob, psys)) {
-		int draw_as = (part->draw_as == PART_DRAW_REND) ? part->ren_as : part->draw_as;
+			return;
-
-		if (draw_as == PART_DRAW_PATH && !psys->pathcache && !psys->childcache) {
-			draw_as = PART_DRAW_DOT;
 		}
-
+		ParticleSettings *part = psys->part;
+		const int draw_as = (part->draw_as == PART_DRAW_REND) ? part->ren_as : part->draw_as;
 		if (draw_as == PART_DRAW_PATH) {
 			struct Gwn_Batch *geom = DRW_cache_particles_get_hair(psys, NULL);
 			DRWShadingGroup *hair_shgrp = CLAY_hair_shgrp_get(vedata, ob, stl, psl);

source/blender/draw/engines/eevee/eevee_materials.c

@@ -1472,7 +1472,7 @@ void EEVEE_materials_cache_populate(EEVEE_Data *vedata, EEVEE_ViewLayerData *sld
 	}
 
 	if (ob->type == OB_MESH) {
-		if (DRW_check_particles_visible_within_active_context(ob)) {
+		if (ob != draw_ctx->object_edit) {
 			material_hash = stl->g_data->hair_material_hash;
 			for (ModifierData *md = ob->modifiers.first; md; md = md->next) {
 				if (md->type != eModifierType_ParticleSystem) {
@@ -1482,9 +1482,12 @@ void EEVEE_materials_cache_populate(EEVEE_Data *vedata, EEVEE_ViewLayerData *sld
 				if (!psys_check_enabled(ob, psys, false)) {
 					continue;
 				}
+				if (!DRW_check_psys_visible_within_active_context(ob, psys)) {
+					continue;
+				}
 				ParticleSettings *part = psys->part;
-				int draw_as = (part->draw_as == PART_DRAW_REND) ? part->ren_as : part->draw_as;
+				const int draw_as = (part->draw_as == PART_DRAW_REND) ? part->ren_as : part->draw_as;
-				if (draw_as != PART_DRAW_PATH || (psys->pathcache == NULL && psys->childcache == NULL)) {
+				if (draw_as != PART_DRAW_PATH) {
 					continue;
 				}
 				struct Gwn_Batch *hair_geom = DRW_cache_particles_get_hair(psys, md);

source/blender/draw/engines/workbench/workbench_materials.c

@@ -488,19 +488,19 @@ static WORKBENCH_MaterialData *get_or_create_material_data(WORKBENCH_Data *vedat
 
 static void workbench_cache_populate_particles(WORKBENCH_Data *vedata, Object *ob)
 {
-	if (!DRW_check_particles_visible_within_active_context(ob)) {
+	const DRWContextState *draw_ctx = DRW_context_state_get();
+	if (ob == draw_ctx->object_edit) {
 		return;
 	}
 	for (ParticleSystem *psys = ob->particlesystem.first; psys != NULL; psys = psys->next) {
 		if (!psys_check_enabled(ob, psys, false)) {
 			continue;
 		}
-		ParticleSettings *part = psys->part;
+		if (!DRW_check_psys_visible_within_active_context(ob, psys)) {
-		int draw_as = (part->draw_as == PART_DRAW_REND) ? part->ren_as : part->draw_as;
+			return;
-
-		if (draw_as == PART_DRAW_PATH && !psys->pathcache && !psys->childcache) {
-			draw_as = PART_DRAW_DOT;
 		}
+		ParticleSettings *part = psys->part;
+		const int draw_as = (part->draw_as == PART_DRAW_REND) ? part->ren_as : part->draw_as;
 
 		static float mat[4][4];
 		unit_m4(mat);

source/blender/draw/intern/DRW_render.h

@@ -451,7 +451,7 @@ bool DRW_object_is_flat_normal(const struct Object *ob);
 int  DRW_object_is_mode_shade(const struct Object *ob);
 int  DRW_object_is_paint_mode(const struct Object *ob);
 
-bool DRW_check_particles_visible_within_active_context(struct Object *object);
+bool DRW_check_psys_visible_within_active_context(struct Object *object, struct ParticleSystem *psys);
 
 /* Draw commands */
 void DRW_draw_pass(DRWPass *pass);

source/blender/draw/intern/draw_manager.c

@@ -36,6 +36,8 @@
 #include "BKE_global.h"
 #include "BKE_mesh.h"
 #include "BKE_object.h"
+#include "BKE_particle.h"
+#include "BKE_pointcache.h"
 #include "BKE_workspace.h"
 
 #include "draw_manager.h"
@@ -219,13 +221,20 @@ int DRW_object_is_paint_mode(const Object *ob)
 	return false;
 }
 
-bool DRW_check_particles_visible_within_active_context(Object *object)
+bool DRW_check_psys_visible_within_active_context(
+        Object *object,
+        struct ParticleSystem *psys)
 {
 	const DRWContextState *draw_ctx = DRW_context_state_get();
 	if (object == draw_ctx->object_edit) {
 		return false;
 	}
-	return (object->mode != OB_MODE_PARTICLE_EDIT);
+	if (object->mode == OB_MODE_PARTICLE_EDIT) {
+		if (psys_in_edit_mode(draw_ctx->depsgraph, psys)) {
+			return false;
+		}
+	}
+	return true;
 }
 
 /** \} */

source/blender/draw/modes/object_mode.c

@@ -1914,11 +1914,14 @@ static void DRW_shgroup_object_center(OBJECT_StorageList *stl, Object *ob, ViewL
 static void OBJECT_cache_populate_particles(Object *ob,
                                             OBJECT_PassList *psl)
 {
-	if (!DRW_check_particles_visible_within_active_context(ob)) {
+	for (ParticleSystem *psys = ob->particlesystem.first; psys; psys = psys->next) {
+		if (!psys_check_enabled(ob, psys, false)) {
+			continue;
+		}
+		if (!DRW_check_psys_visible_within_active_context(ob, psys)) {
 			return;
 		}
-	for (ParticleSystem *psys = ob->particlesystem.first; psys; psys = psys->next) {
+
-		if (psys_check_enabled(ob, psys, false)) {
 		ParticleSettings *part = psys->part;
 		int draw_as = (part->draw_as == PART_DRAW_REND) ? part->ren_as : part->draw_as;
 
@@ -1985,7 +1988,6 @@ static void OBJECT_cache_populate_particles(Object *ob,
 			}
 		}
 	}
-	}
 }
 
 static void OBJECT_cache_populate(void *vedata, Object *ob)