randomly spawn entities around the player

[blank.git] / src / ai / Spawner.cpp

diff --git a/src/ai/Spawner.cpp b/src/ai/Spawner.cpp
index d97aa861152b8bc73718f9e81b0f1778ae6fe11f..b3a9f240105f34f39b97ca489395dd76c3904cbc 100644 (file)
--- a/src/ai/Spawner.cpp
+++ b/src/ai/Spawner.cpp
@@ -11,8 +11,14 @@ namespace blank {
 
 Spawner::Spawner(World &world)
 : world(world)
-, controllers() {
-       Spawn({ 0.0f, 0.0f, 0.0f });
+, controllers()
+, timer(8096)
+, despawn_range(128 * 128)
+, spawn_distance(16 * 16)
+, max_entities(16)
+, chunk_range(4) {
+       timer.Start();
+       Spawn(world.Player().ChunkCoords(), { 0.5f, 0.5f, 0.5f });
 }
 
 Spawner::~Spawner() {
@@ -21,19 +27,81 @@ Spawner::~Spawner() {
 
 
 void Spawner::Update(int dt) {
+       CheckDespawn();
+       timer.Update(dt);
+       if (timer.Hit()) {
+               TrySpawn();
+       }
        for (auto &ctrl : controllers) {
                ctrl.Update(dt);
        }
 }
 
 
-void Spawner::Spawn(const glm::vec3 &pos) {
+void Spawner::CheckDespawn() noexcept {
+       const Entity &reference = world.Player();
+       for (auto iter = controllers.begin(), end = controllers.end(); iter != end;) {
+               Entity &e = iter->Controlled();
+               glm::vec3 diff(reference.AbsoluteDifference(e));
+               if (dot(diff, diff) > despawn_range) {
+                       e.Remove();
+                       iter = controllers.erase(iter);
+               } else {
+                       ++iter;
+               }
+       }
+}
+
+void Spawner::TrySpawn() {
+       if (controllers.size() >= max_entities) return;
+
+       glm::tvec3<int> chunk(
+               (rand() % (chunk_range * 2 + 1)) - chunk_range,
+               (rand() % (chunk_range * 2 + 1)) - chunk_range,
+               (rand() % (chunk_range * 2 + 1)) - chunk_range
+       );
+
+       glm::tvec3<int> pos(
+               rand() % Chunk::width,
+               rand() % Chunk::height,
+               rand() % Chunk::depth
+       );
+
+
+       // distance check
+       glm::vec3 diff(glm::vec3(chunk * Chunk::Extent() - pos) + world.Player().Position());
+       float dist = dot(diff, diff);
+       if (dist > despawn_range || dist < spawn_distance) {
+               return;
+       }
+
+       // block check
+       // TODO: avoid force load, abort spawn if chunk unavailble
+       Chunk &tgt_chunk = world.Next(world.PlayerChunk(), chunk);
+       // TODO: don't use visibility for spawn check
+       //       also, check for more than one block space
+       if (tgt_chunk.Type(tgt_chunk.BlockAt(pos)).visible) {
+               return;
+       }
+
+       Spawn(world.Player().ChunkCoords() + chunk, glm::vec3(pos) + glm::vec3(0.5f));
+}
+
+void Spawner::Spawn(const glm::tvec3<int> &chunk, const glm::vec3 &pos) {
+       glm::vec3 color(rand() % 6, rand() % 6, rand() % 6);
+       color = color * 0.15f + 0.25f;
+
+       glm::vec3 rot(0.000001f);
+       rot.x *= (rand() % 32);
+       rot.y *= (rand() % 32);
+       rot.z *= (rand() % 32);
+
        Entity &e = world.AddEntity();
        e.Name("test");
-       e.Position(pos);
+       e.Position(chunk, pos);
        e.Bounds({ { -0.5f, -0.5f, -0.5f }, { 0.5f, 0.5f, 0.5f } });
        e.WorldCollidable(true);
-       e.SetShape(world.BlockTypes()[1].shape, { 1.0f, 1.0f, 0.0f });
+       e.SetShape(world.BlockTypes()[1].shape, color);
        e.AngularVelocity(glm::quat(glm::vec3{ 0.00001f, 0.000006f, 0.000013f }));
        controllers.emplace_back(e);
 }