Add chase/evade behaviour

game/ai_actions.c

@@ -47,11 +47,89 @@ BzBTStatus aiResetElapsed(AIBlackboard *data, f32 dt) {
     return BZ_BT_SUCCESS;
 }
 
+#define ENEMY_NEARBY_DST 26.0f
+
 BzBTStatus aiIsEnemyNearby(AIBlackboard *data, f32 dt) {
+    if (data->seenEnemy && ecs_is_alive(ECS, data->seenEnemy)) {
+        Position enemyPos = *ecs_get(ECS, data->seenEnemy, Position);
+        Position pos = *ecs_get(ECS, data->entity, Position);
+
+        if (Vector2Distance(enemyPos, pos) > ENEMY_NEARBY_DST)
+            return BZ_BT_SUCCESS;
+    }
+
+    const f32 range = 20.0f;
+    Position pos = *ecs_get(ECS, data->entity, Position);
+    HitBox hb = *ecs_get(ECS, data->entity, HitBox);
+    Vector2 center = entityGetCenter(pos, hb);
+    Owner owner = *ecs_get(ECS, data->entity, Owner);
+
+    ecs_entity_t closest = 0;
+    f32 closestDst = 10000.0f;
+
+    Game *game = ecs_singleton_get_mut(ECS, Game);
+    BzSpatialGridIter it = bzSpatialGridIter(game->entityGrid,
+                                             center.x - range, center.y - range,
+                                             center.x + range, center.y + range);
+    while (bzSpatialGridQueryNext(&it)) {
+        ecs_entity_t other = *(ecs_entity_t *) it.data;
+        if (!ecs_is_alive(ECS, other)) continue;
+
+        if (!ecs_has(ECS, other, Owner) ||
+            ecs_get(ECS, other, Owner)->player == owner.player)
+            continue;
+
+        Position otherPos = *ecs_get(ECS, other, Position);
+        HitBox otherHB = *ecs_get(ECS, other, HitBox);
+        Vector2 otherCenter = entityGetCenter(otherPos, otherHB);
+
+        f32 dst = Vector2Distance(center, otherCenter);
+        if (dst > range) continue;
+
+        if (!bzTileMapCanRayCastLine(&game->map, center, otherCenter))
+            continue;
+
+        if (dst < closestDst) {
+            closest = other;
+            closestDst = dst;
+        }
+    }
+
+    if (closest) {
+        data->seenEnemy = closest;
+        return BZ_BT_SUCCESS;
+    }
+
     return BZ_BT_FAIL;
 }
-BzBTStatus aiEvadeTarget(AIBlackboard *data, f32 dt) {
+BzBTStatus aiAttackEnemy(AIBlackboard *data, f32 dt) {
+    if (!ecs_is_alive(ECS, data->seenEnemy))
         return BZ_BT_SUCCESS;
+
+    Position enemyPos = *ecs_get(ECS, data->seenEnemy, Position);
+    Position pos = *ecs_get(ECS, data->entity, Position);
+
+    Vector2 dif = Vector2Subtract(enemyPos, pos);
+    // Overload steering
+    Steering *steering = ecs_get_mut(ECS, data->entity, Steering);
+    *steering = Vector2Normalize(dif);
+
+    return BZ_BT_RUNNING;
+
+}
+BzBTStatus aiEvadeEnemy(AIBlackboard *data, f32 dt) {
+    if (!ecs_is_alive(ECS, data->seenEnemy))
+        return BZ_BT_SUCCESS;
+
+    Position enemyPos = *ecs_get(ECS, data->seenEnemy, Position);
+    Position pos = *ecs_get(ECS, data->entity, Position);
+
+    Vector2 dif = Vector2Subtract(pos, enemyPos);
+    // Overload steering
+    Steering *steering = ecs_get_mut(ECS, data->entity, Steering);
+    *steering = Vector2Normalize(dif);
+
+    return BZ_BT_RUNNING;
 }
 
 BzBTStatus aiFindNextHarvestable(AIBlackboard *data, f32 dt) {

game/ai_actions.h

@@ -9,6 +9,7 @@
 typedef struct AIBlackboard {
     ecs_entity_t entity;
 
+    ecs_entity_t seenEnemy;
     Vector2 moveToPos;
 
     union {
@@ -29,7 +30,8 @@ BzBTStatus aiMoveTo(AIBlackboard *data, f32 dt);
 BzBTStatus aiResetElapsed(AIBlackboard *data, f32 dt);
 
 BzBTStatus aiIsEnemyNearby(AIBlackboard *data, f32 dt);
-BzBTStatus aiEvadeTarget(AIBlackboard *data, f32 dt);
+BzBTStatus aiAttackEnemy(AIBlackboard *data, f32 dt);
+BzBTStatus aiEvadeEnemy(AIBlackboard *data, f32 dt);
 
 // Worker
 

game/entity_factory.c

@@ -1,6 +1,7 @@
 #include "entity_factory.h"
 
 #include "ai_actions.h"
+#include "systems/systems.h"
 
 ecs_entity_t entityCreateEmpty() {
     ecs_entity_t e = ecs_new_id(ECS);
@@ -18,7 +19,10 @@ ecs_entity_t entityCreateBaseUnit(const Position position, f32 size, Player play
     };
     HitBox hitbox = getEntityHitBoxRec(tileID);
     ecs_entity_t e = entityCreateEmpty();
-    ecs_set_ptr(ECS, e, Position, &position);
+    ecs_set(ECS, e, Position, {
+        position.x - size * 0.5f,
+        position.y + size * 0.5f,
+    });
     f32 scl = size / region.rec.width;
     ecs_set(ECS, e, Size, {region.rec.width * scl, region.rec.height * scl});
     hitbox.x *= scl;
@@ -86,6 +90,9 @@ ecs_entity_t entityCreateSoldier(const Position position, Player player, Game *g
     unit.maxDamage = 10.0f;
     unit.attackCooldown = 1.0f;
     ecs_set_ptr(ECS, e, Unit, &unit);
+    setAIBehaviour(e, game->BTs.unit, &(AIBlackboard) {
+        .moveToPos = position,
+    });
     return e;
 }
 ecs_entity_t entityCreateWarrior(const Position position, Player player, Game *game) {
@@ -100,6 +107,9 @@ ecs_entity_t entityCreateWarrior(const Position position, Player player, Game *g
     unit.maxDamage = 22.0f;
     unit.attackCooldown = 1.8f;
     ecs_set_ptr(ECS, e, Unit, &unit);
+    setAIBehaviour(e, game->BTs.unit, &(AIBlackboard) {
+            .moveToPos = position,
+    });
     return e;
 }
 
@@ -118,6 +128,10 @@ ecs_entity_t entityCreateWorker(const Position position, Player player, Game *ga
         .lastChanged = -1000.0f
     });
 
+    setAIBehaviour(e, game->BTs.unit, &(AIBlackboard) {
+            .moveToPos = position,
+    });
+
     return e;
 }
 

game/game_state.h

@@ -91,8 +91,9 @@ typedef struct Game {
 
     BzStackAlloc stackAlloc;
     struct {
-        BzBTNode *workerHarvest;
+        BzBTNode *worker;
-        BzBTNode *moveTo;
+        BzBTNode *unit;
+        BzBTNode *unitEvasive;
     } BTs;
     struct {
         BzObjectPool *pathData;

game/main.c

@@ -259,25 +259,52 @@ bool init(void *userData) {
     });
     game->pools.btNode = bzObjectPoolCreate(&(BzObjectPoolDesc) {
         .objectSize = bzBTGetNodeSize(),
-        .objectsPerPage = 64
+        .objectsPerPage = 40
     });
     game->pools.btNodeState = bzObjectPoolCreate(&(BzObjectPoolDesc) {
         .objectSize = bzBTGetNodeStateSize(),
         .objectsPerPage = 1024,
     });
     BzObjectPool *nodePool = game->pools.btNode;
-    // moveTo
+    // unit (aggressive)
     {
         BzBTNode *root = NULL;
         BzBTNode *node = NULL;
         root = bzBTMakeRoot(nodePool);
-        game->BTs.moveTo = root;
+        game->BTs.unit = root;
 
-        // Just a single action for now
+        BzBTNode *sel = bzBTCompSelector(nodePool, root);
-        BzBTNode *seq = bzBTCompSequence(nodePool, root);
+        BzBTNode *attackSeq = bzBTCompSequence(nodePool, sel);
-        node = bzBTAction(nodePool, seq, (BzBTActionFn) aiMoveTo);
+        {
+            node = bzBTAction(nodePool, attackSeq, (BzBTActionFn) aiIsEnemyNearby);
+            bzBTNodeSetName(node, "isEnemyNearby");
+
+            node = bzBTAction(nodePool, attackSeq, (BzBTActionFn) aiAttackEnemy);
+            bzBTNodeSetName(node, "attackEnemy");
+        }
+        node = bzBTAction(nodePool, sel, (BzBTActionFn) aiMoveTo);
         bzBTNodeSetName(node, "moveTo");
-        bzBTDecorDelay(nodePool, seq, 6.0f);
+        bzBTDecorDelay(nodePool, sel, 2.0f);
+    }
+    // Unit (evasive)
+    {
+        BzBTNode *root = NULL;
+        BzBTNode *node = NULL;
+        root = bzBTMakeRoot(nodePool);
+        game->BTs.unitEvasive = root;
+
+        BzBTNode *sel = bzBTCompSelector(nodePool, root);
+        BzBTNode *evadeSeq = bzBTCompSequence(nodePool, sel);
+        {
+            node = bzBTAction(nodePool, evadeSeq, (BzBTActionFn) aiIsEnemyNearby);
+            bzBTNodeSetName(node, "isEnemyNearby");
+
+            node = bzBTAction(nodePool, evadeSeq, (BzBTActionFn) aiEvadeEnemy);
+            bzBTNodeSetName(node, "evadeEnemy");
+        }
+        node = bzBTAction(nodePool, sel, (BzBTActionFn) aiMoveTo);
+        bzBTNodeSetName(node, "moveTo");
+        bzBTDecorDelay(nodePool, sel, 2.0f);
     }
     // evade
     BzBTNode *evade = NULL;
@@ -290,18 +317,16 @@ bool init(void *userData) {
             node = bzBTAction(nodePool, evadeSeq, (BzBTActionFn) aiIsEnemyNearby);
             bzBTNodeSetName(node, "enemyNearby");
 
-            node = bzBTAction(nodePool, evadeSeq, (BzBTActionFn) aiEvadeTarget);
+            node = bzBTAction(nodePool, evadeSeq, (BzBTActionFn) aiEvadeEnemy);
             bzBTNodeSetName(node, "evadeTarget");
         }
-
-
     }
     // worker harvest
     {
         BzBTNode *root = NULL;
         BzBTNode *node = NULL;
         root = bzBTMakeRoot(nodePool);
-        game->BTs.workerHarvest = root;
+        game->BTs.worker = root;
 
         BzBTNode *pSel = bzBTCompPSelector(nodePool, root);
         bzBTSubTree(evade, pSel);

game/map_init.c

@@ -377,7 +377,7 @@ void loadMap(Game *game, const char *path, bool mainMenu) {
             if (nearest.entity == 0) continue;
 
             ResourceType resType = ecs_get(ECS, nearest.entity, Resource)->type;
-            setAIBehaviour(workers[i].entity, game->BTs.workerHarvest, &(AIBlackboard) {
+            setAIBehaviour(workers[i].entity, game->BTs.worker, &(AIBlackboard) {
                 .as.worker = {
                         .harvestType = resType,
                         .harvestTarget = nearest.entity,

game/systems/s_input.c

@@ -115,6 +115,16 @@ void inputUnitAction(Game *game, InputState *input) {
     const i32 numUnits = ecs_query_entity_count(query);
     BZ_ASSERT(numUnits > 0);
 
+    ecs_entity_t *units = bzStackAlloc(&game->stackAlloc, sizeof(*units) * numUnits);
+    i32 unitIdx = 0;
+    ecs_iter_t it = ecs_query_iter(ECS, query);
+    while (ecs_query_next(&it)) {
+        for (i32 i = 0; i < it.count; i++) {
+            ecs_entity_t entity = it.entities[i];
+            units[unitIdx++] = entity;
+        }
+    }
+
     const MouseButton actionBtn = input->mapping.secondaryBtn;
 
     input->cursor = CURSOR_NONE;
@@ -166,13 +176,10 @@ void inputUnitAction(Game *game, InputState *input) {
             qsort(harvestables, numHarvestables, sizeof(*harvestables), entityFloatPairCmp);
             i32 idxHarvestable = 0;
 
-            ecs_defer_begin(ECS);
+            for (i32 i = 0; i < unitIdx; i++) {
-            ecs_iter_t it = ecs_query_iter(ECS, query);
-            while (ecs_query_next(&it)) {
-                for (i32 i = 0; i < it.count; i++) {
                 if (idxHarvestable >= numHarvestables)
                     break;
-                    ecs_entity_t entity = it.entities[i];
+                ecs_entity_t entity = units[i];
 
                 EntityFloatPair harvestEntity = {0, 0};
                 while (idxHarvestable < numHarvestables) {
@@ -192,7 +199,7 @@ void inputUnitAction(Game *game, InputState *input) {
                 Worker *worker = ecs_get_mut(ECS, entity, Worker);
                 worker->carryRes = resource.type;
 
-                    setAIBehaviour(entity, game->BTs.workerHarvest, &(AIBlackboard) {
+                setAIBehaviour(entity, game->BTs.worker, &(AIBlackboard) {
                         .as.worker = {
                                 .harvestType = resource.type,
                                 .harvestTarget = harvestEntity.entity,
@@ -202,11 +209,13 @@ void inputUnitAction(Game *game, InputState *input) {
                 });
             }
         }
-            ecs_defer_end(ECS);
-        }
         return;
     }
 
+    if ((taskEntity = queryEntity(game->entityGrid, input->mouseWorld, ecs_id(Owner))) && ecs_get(ECS, taskEntity, Owner)->player != game->player) {
+        input->cursor = CURSOR_ATTACK;
+    }
+
     // Unit place position
     Vector2 *positions = bzStackAlloc(&game->stackAlloc, sizeof(*positions) * numUnits);
     Vector2 start = Vector2Zero();
@@ -254,13 +263,14 @@ void inputUnitAction(Game *game, InputState *input) {
 
         for (i32 i = 0; i < unitIdx; i++) {
             ecs_entity_t entity = entities[i].entity;
-            setAIBehaviour(entity, game->BTs.moveTo, &(AIBlackboard) {
+            setAIBehaviour(entity, game->BTs.unit, &(AIBlackboard) {
                     .moveToPos = positions[i],
                     .proximity = 1.0f,
             });
         }
     }
 
+    bzStackAllocFree(&game->stackAlloc, units);
 }
 
 void updatePlayerInput() {
@@ -450,7 +460,7 @@ void drawPlayerInputUIGround() {
         }
     }
 
-    if (input->unitPlacePos) {
+    if (input->unitPlacePos && input->cursor == CURSOR_NONE && input->numUnits >= 2) {
         for (i32 i = 0; i < input->numUnits; i++) {
             DrawCircleV(input->unitPlacePos[i], 2.0f, RED);
         }

game/systems/s_ui.c

@@ -406,11 +406,11 @@ void drawMainMenuUI(Game *game, f32 dt) {
     if (uiMainMenuButton("Play", true)) {
         setScreen(game, SCREEN_GAME);
         unloadMap(game);
-        //loadMap(game, "assets/maps/tree_test.tmj");
+        //loadMap(game, "assets/maps/tree_test.tmj", false);
-        //loadMap(game, "assets/maps/entity_test.tmj");
+        //loadMap(game, "assets/maps/entity_test.tmj", false);
-        //loadMap(game, "assets/maps/worker_test.tmj");
+        //loadMap(game, "assets/maps/worker_test.tmj", false);
-        //loadMap(game, "assets/maps/battle_test.tmj");
+        loadMap(game, "assets/maps/battle_test.tmj", false);
-        loadMap(game, "assets/maps/map_01.tmj", false);
+        //loadMap(game, "assets/maps/map_01.tmj", false);
     }
     if (uiMainMenuButton("Settings", true)) {
         setScreen(game, SCREEN_SETTINGS);