basic ai demo

code/foundation/CMakeLists.txt

@@ -24,6 +24,7 @@ add_library(eco2d-foundation STATIC
     src/models/prefabs/splitter.c
     src/models/prefabs/craftbench.c
     src/models/prefabs/assembler.c
+    src/models/prefabs/creature.c
 
     src/pkt/packet.c
 

code/foundation/src/dev/debug_ui_actions.c

@@ -3,6 +3,8 @@
 #include "models/items.h"
 #include "net/network.h"
 
+#include "models/entity.h"
+
 void
 ActExitGame(void) {
     game_request_close();
@@ -230,8 +232,7 @@ ActSpawnDemoNPCs(void) {
     if (zpl_array_count(demo_npcs) >= 100000) return;
 
     for (uint32_t i = 0; i < 1000; i++) {
-        uint64_t e = entity_spawn(EKIND_DEMO_NPC);
+        uint64_t e = entity_spawn_id(ASSET_CREATURE);
-        ecs_add(world_ecs(), e, DemoNPC);
         Position *pos = ecs_get_mut(world_ecs(), e, Position);
         pos->x=(float)(rand() % world_dim());
         pos->y=(float)(rand() % world_dim());

code/foundation/src/gen/texgen_fallback.c

@@ -27,7 +27,9 @@ Texture2D texgen_build_sprite_fallback(asset_id id) {
         case ASSET_IRON_PLATES: return LoadTexEco("iron_plate");
         case ASSET_SCREWS: return LoadTexEco("screws");
         case ASSET_LOG: return LoadTexEco("log");
-        case ASSET_PLANK: return LoadTexEco("plank");
+		case ASSET_PLANK: return LoadTexEco("plank");
+		case ASSET_CREATURE: return GenColorEco(YELLOW);
+		case ASSET_CREATURE_FOOD: return GenColorEco(GREEN);
         
         // NOTE(zaklaus): blocks
         case ASSET_FENCE: return LoadTexEco("fence");

code/foundation/src/lists/assets_ids.h

@@ -2,7 +2,49 @@
 
 #define ASSET_INVALID 0xFF
 
-#include "assets_ids.lst"
+#define _ASSETS\
+	X(ASSET_EMPTY)\
+	X(ASSET_BLANK)\
+	X(ASSET_BLOCK_FRAME)\
+	X(ASSET_BUILDMODE_HIGHLIGHT)\
+	X(ASSET_PLAYER)\
+	X(ASSET_THING)\
+	X(ASSET_CREATURE)\
+	X(ASSET_CREATURE_FOOD)\
+	X(ASSET_CHEST)\
+	X(ASSET_SPLITTER)\
+	X(ASSET_ASSEMBLER)\
+	X(ASSET_FURNACE)\
+	X(ASSET_CRAFTBENCH)\
+	X(ASSET_BLUEPRINT_BEGIN)\
+	X(ASSET_BLUEPRINT)\
+	X(ASSET_BLUEPRINT_DEMO_HOUSE)\
+	X(ASSET_BLUEPRINT_END)\
+	X(ASSET_FENCE)\
+	X(ASSET_DEV)\
+	X(ASSET_GROUND)\
+	X(ASSET_DIRT)\
+	X(ASSET_WATER)\
+	X(ASSET_LAVA)\
+	X(ASSET_WALL)\
+	X(ASSET_HILL)\
+	X(ASSET_HILL_SNOW)\
+	X(ASSET_HOLE)\
+	X(ASSET_WOOD)\
+	X(ASSET_TREE)\
+	X(ASSET_COAL)\
+	X(ASSET_IRON_ORE)\
+	X(ASSET_IRON_INGOT)\
+	X(ASSET_IRON_PLATES)\
+	X(ASSET_SCREWS)\
+	X(ASSET_LOG)\
+	X(ASSET_PLANK)\
+	X(ASSET_TEST_TALL)\
+	X(ASSET_BELT)\
+	X(ASSET_BELT_LEFT)\
+	X(ASSET_BELT_RIGHT)\
+	X(ASSET_BELT_UP)\
+	X(ASSET_BELT_DOWN)
 
 typedef enum {
 #define X(idx) idx,

code/foundation/src/lists/assets_ids.lst

@@ -1,42 +0,0 @@
-#define _ASSETS\
-	X(ASSET_EMPTY)\
-	X(ASSET_BLANK)\
-	X(ASSET_BLOCK_FRAME)\
-	X(ASSET_BUILDMODE_HIGHLIGHT)\
-	X(ASSET_PLAYER)\
-	X(ASSET_THING)\
-	X(ASSET_CHEST)\
-	X(ASSET_SPLITTER)\
-	X(ASSET_ASSEMBLER)\
-	X(ASSET_FURNACE)\
-	X(ASSET_CRAFTBENCH)\
-	X(ASSET_BLUEPRINT_BEGIN)\
-	X(ASSET_BLUEPRINT)\
-	X(ASSET_BLUEPRINT_DEMO_HOUSE)\
-	X(ASSET_BLUEPRINT_END)\
-	X(ASSET_FENCE)\
-	X(ASSET_DEV)\
-	X(ASSET_GROUND)\
-	X(ASSET_DIRT)\
-	X(ASSET_WATER)\
-	X(ASSET_LAVA)\
-	X(ASSET_WALL)\
-	X(ASSET_HILL)\
-	X(ASSET_HILL_SNOW)\
-	X(ASSET_HOLE)\
-	X(ASSET_WOOD)\
-	X(ASSET_TREE)\
-	X(ASSET_COAL)\
-	X(ASSET_IRON_ORE)\
-	X(ASSET_IRON_INGOT)\
-	X(ASSET_IRON_PLATES)\
-	X(ASSET_SCREWS)\
-	X(ASSET_LOG)\
-	X(ASSET_PLANK)\
-	X(ASSET_TEST_TALL)\
-	X(ASSET_BELT)\
-	X(ASSET_BELT_LEFT)\
-	X(ASSET_BELT_RIGHT)\
-	X(ASSET_BELT_UP)\
-	X(ASSET_BELT_DOWN)
-	

code/foundation/src/lists/assets_list.c

@@ -22,7 +22,9 @@ static asset assets[] = {
     ASSET_TEX(ASSET_SCREWS),
     ASSET_TEX(ASSET_LOG),
     ASSET_TEX(ASSET_PLANK),
-    ASSET_TEX(ASSET_CHEST),
+	ASSET_TEX(ASSET_CHEST),
+	ASSET_TEX(ASSET_CREATURE),
+	ASSET_TEX(ASSET_CREATURE_FOOD),
     ASSET_TEX(ASSET_FURNACE),
     ASSET_TEX(ASSET_SPLITTER),
     ASSET_TEX(ASSET_ASSEMBLER),

code/foundation/src/lists/entity_spawnlist.c

@@ -5,6 +5,7 @@
 #include "models/prefabs/craftbench.h"
 #include "models/prefabs/splitter.h"
 #include "models/prefabs/assembler.h"
+#include "models/prefabs/creature.h"
 
 static struct {
     asset_id id;
@@ -17,6 +18,7 @@ static struct {
     { .id = ASSET_SPLITTER, .proc = splitter_spawn },
     { .id = ASSET_ASSEMBLER, .proc = assembler_spawn },
     { .id = ASSET_BLUEPRINT, .proc_udata = blueprint_spawn_udata },
+	{ .id = ASSET_CREATURE, .proc = creature_spawn },
 };
 
 #define MAX_ENTITY_SPAWNDEFS ((sizeof(entity_spawnlist))/(sizeof(entity_spawnlist[0])))

code/foundation/src/lists/items_list.c

@@ -27,12 +27,14 @@ static item_desc items[] = {
     ITEM_ENT(ASSET_CRAFTBENCH, 32, ASSET_CRAFTBENCH),
     ITEM_ENT(ASSET_FURNACE, 32, ASSET_FURNACE),
     ITEM_ENT(ASSET_SPLITTER, 32, ASSET_SPLITTER),
-    ITEM_ENT(ASSET_ASSEMBLER, 32, ASSET_ASSEMBLER),
+	ITEM_ENT(ASSET_ASSEMBLER, 32, ASSET_ASSEMBLER),
+	ITEM_ENT(ASSET_CREATURE, 32, ASSET_CREATURE),
     
     ITEM_HOLD(ASSET_IRON_ORE, 64),
     ITEM_HOLD(ASSET_IRON_INGOT, 64),
     ITEM_HOLD(ASSET_IRON_PLATES, 64),
     ITEM_HOLD(ASSET_SCREWS, 64),
     ITEM_HOLD(ASSET_LOG, 64),
-    ITEM_HOLD(ASSET_PLANK, 64),
+	ITEM_HOLD(ASSET_PLANK, 64),
+	ITEM_HOLD(ASSET_CREATURE_FOOD, 1),
 };

code/foundation/src/models/components.c

@@ -1,51 +1,15 @@
 #include "models/components.h"
 
-ECS_COMPONENT_DECLARE(Vector2D);
+
-ECS_COMPONENT_DECLARE(Position);
+
-ECS_COMPONENT_DECLARE(Velocity);
+#define X(comp) ECS_COMPONENT_DECLARE(comp);
-ECS_COMPONENT_DECLARE(Chunk);
+_COMPS
-ECS_COMPONENT_DECLARE(Drawable);
+#undef X
-ECS_COMPONENT_DECLARE(Input);
-ECS_COMPONENT_DECLARE(ClientInfo);
-ECS_COMPONENT_DECLARE(Health);
-ECS_COMPONENT_DECLARE(Classify);
-ECS_COMPONENT_DECLARE(Vehicle);
-ECS_COMPONENT_DECLARE(IsInVehicle);
-ECS_COMPONENT_DECLARE(Item);
-ECS_COMPONENT_DECLARE(BlockHarvest);
-ECS_COMPONENT_DECLARE(Inventory);
-ECS_COMPONENT_DECLARE(ItemContainer);
-ECS_COMPONENT_DECLARE(Producer);
-ECS_COMPONENT_DECLARE(EnergySource);
-ECS_COMPONENT_DECLARE(ItemRouter);
-ECS_COMPONENT_DECLARE(Device);
-ECS_COMPONENT_DECLARE(Blueprint);
-ECS_COMPONENT_DECLARE(DemoNPC);
-ECS_COMPONENT_DECLARE(StreamInfo);
 
 void ComponentsImport(ecs_world_t *ecs) {
     ECS_MODULE(ecs, Components);
-    
+
-    ECS_COMPONENT_DEFINE(ecs, Vector2D);
+#define X(comp) ECS_COMPONENT_DEFINE(ecs, comp);
-    ECS_COMPONENT_DEFINE(ecs, Position);
+	_COMPS
-    ECS_COMPONENT_DEFINE(ecs, Velocity);
+#undef X
-    ECS_COMPONENT_DEFINE(ecs, Chunk);
-    ECS_COMPONENT_DEFINE(ecs, Drawable);
-    ECS_COMPONENT_DEFINE(ecs, Input);
-    ECS_COMPONENT_DEFINE(ecs, ClientInfo);
-    ECS_COMPONENT_DEFINE(ecs, Health);
-    ECS_COMPONENT_DEFINE(ecs, Classify);
-    ECS_COMPONENT_DEFINE(ecs, Vehicle);
-    ECS_COMPONENT_DEFINE(ecs, IsInVehicle);
-    ECS_COMPONENT_DEFINE(ecs, Item);
-    ECS_COMPONENT_DEFINE(ecs, BlockHarvest);
-    ECS_COMPONENT_DEFINE(ecs, Inventory);
-    ECS_COMPONENT_DEFINE(ecs, ItemContainer);
-    ECS_COMPONENT_DEFINE(ecs, Producer);
-    ECS_COMPONENT_DEFINE(ecs, EnergySource);
-    ECS_COMPONENT_DEFINE(ecs, ItemRouter);
-    ECS_COMPONENT_DEFINE(ecs, Device);
-    ECS_COMPONENT_DEFINE(ecs, Blueprint);
-    ECS_COMPONENT_DEFINE(ecs, DemoNPC);
-    ECS_COMPONENT_DEFINE(ecs, StreamInfo);
 }

code/foundation/src/models/components.h

@@ -185,27 +185,44 @@ typedef struct {
 
 typedef struct {char _unused;} DemoNPC;
 
-extern ECS_COMPONENT_DECLARE(Vector2D);
+typedef struct {
-extern ECS_COMPONENT_DECLARE(Position);
+	int16_t hunger_satisfied;
-extern ECS_COMPONENT_DECLARE(Velocity);
+	int16_t mating_satisfied;
-extern ECS_COMPONENT_DECLARE(Chunk);
+	int16_t life_remaining;
-extern ECS_COMPONENT_DECLARE(Drawable);
+} Creature;
-extern ECS_COMPONENT_DECLARE(Input);
+
-extern ECS_COMPONENT_DECLARE(ClientInfo);
+typedef struct { char _unused; } SeeksFood;
-extern ECS_COMPONENT_DECLARE(Health);
+typedef struct { char _unused; } SeeksCompanion;
-extern ECS_COMPONENT_DECLARE(Classify);
+
-extern ECS_COMPONENT_DECLARE(Vehicle);
+#define _COMPS\
-extern ECS_COMPONENT_DECLARE(IsInVehicle);
+	X(Vector2D)\
-extern ECS_COMPONENT_DECLARE(Item);
+	X(Position)\
-extern ECS_COMPONENT_DECLARE(BlockHarvest);
+	X(Velocity)\
-extern ECS_COMPONENT_DECLARE(Inventory);
+	X(Chunk)\
-extern ECS_COMPONENT_DECLARE(ItemContainer);
+	X(Drawable)\
-extern ECS_COMPONENT_DECLARE(Producer);
+	X(Input)\
-extern ECS_COMPONENT_DECLARE(EnergySource);
+	X(ClientInfo)\
-extern ECS_COMPONENT_DECLARE(ItemRouter);
+	X(Health)\
-extern ECS_COMPONENT_DECLARE(Device);
+	X(Classify)\
-extern ECS_COMPONENT_DECLARE(Blueprint);
+	X(Vehicle)\
-extern ECS_COMPONENT_DECLARE(DemoNPC);
+	X(IsInVehicle)\
-extern ECS_COMPONENT_DECLARE(StreamInfo);
+	X(Item)\
+	X(BlockHarvest)\
+	X(Inventory)\
+	X(ItemContainer)\
+	X(Producer)\
+	X(EnergySource)\
+	X(ItemRouter)\
+	X(Device)\
+	X(Blueprint)\
+	X(DemoNPC)\
+	X(Creature)\
+	X(SeeksFood)\
+	X(SeeksCompanion)\
+	X(StreamInfo)
+
+#define X(comp) extern ECS_COMPONENT_DECLARE(comp);
+	_COMPS
+#undef X
 
 void ComponentsImport(ecs_world_t *ecs);

code/foundation/src/models/prefabs/creature.c

@@ -0,0 +1,21 @@
+#include "creature.h"
+#include "world/world.h"
+
+#include "models/entity.h"
+#include "world/entity_view.h"
+#include "models/components.h"
+
+uint64_t creature_spawn(void) {
+	ecs_entity_t e = entity_spawn(EKIND_DEMO_NPC);
+
+	Creature *c = ecs_get_mut_ex(world_ecs(), e, Creature);
+	c->hunger_satisfied = 0;
+	c->mating_satisfied = rand() % 1800;
+	c->life_remaining = 500 + rand() % 5200;
+
+	return (uint64_t)e;
+}
+
+void creature_despawn(uint64_t ent_id) {
+	entity_despawn(ent_id);
+}

code/foundation/src/models/prefabs/creature.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include "platform/system.h"
+
+uint64_t creature_spawn(void);
+void creature_despawn(uint64_t id);

code/foundation/src/systems/modules/system_demo.c

@@ -10,3 +10,164 @@ void DemoNPCMoveAround(ecs_iter_t *it) {
         entity_wake(it->entities[i]);
     }
 }
+
+//------------------------------------------------------------------------
+
+#define CREATURE_FOOD_SATISFY_FOR 200
+#define CREATURE_MATING_SATISFY_FOR 300
+#define CREATURE_INTERACT_RANGE 5625.0f
+#define CREATURE_SEEK_FOOD_MOVEMENT_SPEED 0.98f
+#define CREATURE_SEEK_MATE_MOVEMENT_SPEED 0.357f
+#define CREATURE_SEEK_ROAM_MOVEMENT_SPEED 50.0f // *dt
+
+void CreatureCheckNeeds(ecs_iter_t *it) {
+	Creature *c = ecs_field(it, Creature, 1);
+
+	for (int i = 0; i < it->count; i++) {
+		// check hunger
+		if (c[i].hunger_satisfied < 1) {
+			ecs_add(it->world, it->entities[i], SeeksFood);
+		}
+
+		// check mating
+		if (c[i].mating_satisfied < 1) {
+			ecs_add(it->world, it->entities[i], SeeksCompanion);
+		}
+
+		// die of an old age
+		if (c[i].life_remaining < 1) {
+			entity_despawn(it->entities[i]);
+			continue;
+		}
+
+		// tick down needs
+		TICK_VAR(c[i].hunger_satisfied);
+		TICK_VAR(c[i].mating_satisfied);
+		TICK_VAR(c[i].life_remaining);
+	}
+}
+
+void CreatureSeekFood(ecs_iter_t *it) {
+	Creature *c = ecs_field(it, Creature, 1);
+	Position *p = ecs_field(it, Position, 2);
+	Velocity *v = ecs_field(it, Velocity, 3);
+
+	for (int i = 0; i < it->count; i++) {
+		size_t ents_count;
+		uint64_t *ents = world_chunk_query_entities(it->entities[i], &ents_count, 2);
+
+		float closest_ent_dist = ZPL_F32_MAX;
+		uint64_t closest_ent = 0;
+		Position *p2 = 0;
+
+		// find the closest item of kind ASSET_CREATURE_FOOD
+		for (size_t j = 0; j < ents_count; j++) {
+			Item *drop = 0;
+			uint64_t ent_id = ents[j];
+			if ((drop = ecs_get_mut_if_ex(it->world, ent_id, Item))) {
+				if (drop->kind != ASSET_CREATURE_FOOD)
+					continue;
+
+				p2 = ecs_get_mut_ex(it->world, ent_id, Position);
+				float dx = p2->x - p[i].x;
+				float dy = p2->y - p[i].y;
+				float range = (dx*dx + dy*dy);
+
+				// item is close enough, eat it!
+				if (range < CREATURE_INTERACT_RANGE) {
+					drop->quantity--;
+                                
+					if (drop->quantity == 0)
+						item_despawn(ent_id);
+
+					c[i].hunger_satisfied = CREATURE_FOOD_SATISFY_FOR;
+					ecs_remove(it->world, it->entities[i], SeeksFood);
+				}
+				else if (range < closest_ent_dist)
+					closest_ent = ent_id;
+			}
+		}
+
+		// drift towards the item
+		if (closest_ent) {
+			float dx = p2->x - p[i].x;
+			float dy = p2->y - p[i].y;
+			float r = 1; //zpl_sqrt(dx*dx + dy*dy);
+			v[i].x = (dx/r) * CREATURE_SEEK_MATE_MOVEMENT_SPEED;
+			v[i].y = (dy/r) * CREATURE_SEEK_MATE_MOVEMENT_SPEED;
+		} else {
+			// die if no food is left
+			entity_despawn(it->entities[i]);
+			continue;
+		}
+	}
+}
+
+void CreatureSeekCompanion(ecs_iter_t *it) {
+	Creature *c = ecs_field(it, Creature, 1);
+	Position *p = ecs_field(it, Position, 2);
+	Velocity *v = ecs_field(it, Velocity, 3);
+
+	for (int i = 0; i < it->count; i++) {
+		size_t ents_count;
+		uint64_t *ents = world_chunk_query_entities(it->entities[i], &ents_count, 2);
+
+		float closest_ent_dist = ZPL_F32_MAX;
+		uint64_t closest_ent = 0;
+		Position *p2 = 0;
+
+		// find the closest entity that also seeks a companion
+		for (size_t j = 0; j < ents_count; j++) {
+			uint64_t ent_id = ents[j];
+			if (ent_id != it->entities[i] && ecs_get_if(it->world, ent_id, SeeksCompanion)) {
+				p2 = ecs_get_mut_ex(it->world, ent_id, Position);
+				float dx = p2->x - p[i].x;
+				float dy = p2->y - p[i].y;
+				float range = (dx*dx + dy*dy);
+
+				// creature is close enough, mate them!
+				if (range < CREATURE_INTERACT_RANGE) {
+					// remove the need
+					c[i].mating_satisfied = CREATURE_MATING_SATISFY_FOR;
+					ecs_remove(it->world, it->entities[i], SeeksCompanion);
+					ecs_remove(it->world, ent_id, SeeksCompanion);
+
+					// spawn a new creature
+					uint64_t ch = entity_spawn_id(ASSET_CREATURE);
+					entity_set_position(ch, p[i].x, p[i].y);
+				}
+				else if (range < closest_ent_dist)
+					closest_ent = ent_id;
+			}
+		}
+
+		// drift towards the creature
+		if (closest_ent) {
+			float dx = p2->x - p[i].x;
+			float dy = p2->y - p[i].y;
+			float r = 1; //zpl_sqrt(dx*dx + dy*dy);
+			v[i].x = (dx/r) * CREATURE_SEEK_MATE_MOVEMENT_SPEED;
+			v[i].y = (dy/r) * CREATURE_SEEK_MATE_MOVEMENT_SPEED;
+			entity_wake(it->entities[i]);
+		} else {
+			// no companion is found, let's try again later.
+			c[i].mating_satisfied = CREATURE_MATING_SATISFY_FOR;
+			ecs_remove(it->world, it->entities[i], SeeksCompanion);
+		}
+	}
+}
+
+void CreatureRoamAround(ecs_iter_t *it) {
+	Velocity *v = ecs_field(it, Velocity, 1);
+	for (int i = 0; i < it->count; i++) {
+		float d = zpl_quake_rsqrt(v[i].x*v[i].x + v[i].y*v[i].y);
+		if (zpl_abs(v[i].x) < 0.1f)
+			v[i].x = (float)(rand() % 5);
+		if (zpl_abs(v[i].y) < 0.1f)
+			v[i].y = (float)(rand() % 5);
+		v[i].x += (v[i].x*d*CREATURE_SEEK_ROAM_MOVEMENT_SPEED*safe_dt(it) + zpl_cos(zpl_to_radians((float)(rand()%360)))*game_rules.demo_npc_steer_speed*safe_dt(it));
+		v[i].y += (v[i].y*d*CREATURE_SEEK_ROAM_MOVEMENT_SPEED*safe_dt(it) + zpl_sin(zpl_to_radians((float)(rand()%360)))*game_rules.demo_npc_steer_speed*safe_dt(it));
+
+		entity_wake(it->entities[i]);
+	}
+}

code/foundation/src/systems/modules/system_producer.c

@@ -56,7 +56,7 @@ void ProduceItems(ecs_iter_t *it) {
             entity_wake(it->entities[i]);
         }
 
-		producer[i].process_ticks_left = zpl_max(producer[i].process_ticks_left-1, 0) ;
+		TICK_VAR(producer[i].process_ticks_left);
     }
 }
 

code/foundation/src/systems/systems.c

@@ -269,7 +269,12 @@ void SystemsImport(ecs_world_t *ecs) {
     ECS_SYSTEM_TICKED(ecs, HarvestIntoContainers, EcsPostUpdate, components.ItemContainer, components.Position, !components.BlockHarvest);
     ECS_SYSTEM_TICKED(ecs, ProduceItems, EcsPostUpdate, components.ItemContainer, components.Producer, components.Position, components.Device);
     ECS_SYSTEM_TICKED_EX(ecs, PushItemsOnNodes, EcsPostUpdate, 20, components.ItemContainer, components.Position, components.Device, components.ItemRouter);
-    ECS_SYSTEM_TICKED(ecs, BuildBlueprints, EcsPostUpdate, components.Blueprint, components.Device, components.Position);
+	ECS_SYSTEM_TICKED(ecs, BuildBlueprints, EcsPostUpdate, components.Blueprint, components.Device, components.Position);
+	
+	ECS_SYSTEM_TICKED(ecs, CreatureCheckNeeds, EcsPostUpdate, components.Creature);
+	ECS_SYSTEM_TICKED(ecs, CreatureSeekFood, EcsPostUpdate, components.Creature, components.Position, components.Velocity, components.SeeksFood, !components.SeeksCompanion);
+	ECS_SYSTEM_TICKED(ecs, CreatureSeekCompanion, EcsPostUpdate, components.Creature, components.Position, components.Velocity, components.SeeksCompanion, !components.SeeksFood);
+	ECS_SYSTEM(ecs, CreatureRoamAround, EcsPostUpdate, components.Velocity, components.Creature, !components.SeeksFood, !components.SeeksCompanion);
     
     ECS_SYSTEM(ecs, ResetActivators, EcsPostUpdate, components.Input);
     

code/foundation/src/systems/systems.h

@@ -5,4 +5,6 @@ static inline float safe_dt(ecs_iter_t *it) {
     return zpl_min(it->delta_time, 0.03334f);
 }
 
+#define TICK_VAR(var) (var) = zpl_max((var)-1, 0)
+
 void SystemsImport(ecs_world_t *ecs);

code/games/sandbox/src/worldgen.c

@@ -144,6 +144,15 @@ int32_t worldgen_build(world_data *wld) {
         entity_set_position(e, dest->x, dest->y);
     }
 
+	for (int i=0; i<RAND_RANGE(3852, 5964); i++) {
+		uint64_t e = item_spawn(ASSET_CREATURE_FOOD, 1);
+
+		Position *dest = ecs_get_mut(world_ecs(), e, Position);
+		dest->x = RAND_RANGEF(0, world->dim*WORLD_BLOCK_SIZE);
+		dest->y = RAND_RANGEF(0, world->dim*WORLD_BLOCK_SIZE);
+		entity_set_position(e, dest->x, dest->y);
+	}
+
 #endif
 
     return WORLD_ERROR_NONE;