feat(gameplay): add walking sound for players and adjust underwater bubble interval

- Move walk/run sound interval constants from anonymous namespace to ClientPlayer header
- Add moving_time field to PlayerInfo to track continuous movement
- Implement play_walk_sound callback triggered by WALK and RUN gaits
- Increase underwater bubble timer from 1.0s to 1.5s

include/Cubed/gameplay/client_player.hpp

@@ -17,6 +17,8 @@ namespace Cubed {
 class ClientWorld;
 class ClientPlayer {
 public:
+    static constexpr float WALK_SOUND_INTERVAL = 0.45f;
+    static constexpr float RUN_SOUND_INTERVAL = 0.3f;
     using ChunkPosSet = absl::flat_hash_set<ChunkPos, ChunkPos::Hash>;
     ClientPlayer(ClientWorld& world);
     ~ClientPlayer();

include/Cubed/gameplay/client_world.hpp

@@ -28,6 +28,7 @@ struct PlayerInfo {
     Gait gait;
     float angle = 0.0f;
     float walk_time = 0.0f;
+    float moving_time = 0.0f;
 };
 
 struct PlayerRenderData {

src/gameplay/client_player.cpp

@@ -5,10 +5,7 @@
 #include "Cubed/debug_collector.hpp"
 #include "Cubed/gameplay/client_world.hpp"
 
-namespace {
-constexpr float WALK_SOUND_INTERVAL = 0.45f;
-constexpr float RUN_SOUND_INTERVAL = 0.3f;
-} // namespace
+namespace {} // namespace
 
 namespace Cubed {
 ClientPlayer::ClientPlayer(ClientWorld& world) : m_world(world) {}

src/gameplay/client_world.cpp

@@ -398,7 +398,7 @@ void ClientWorld::init(std::string_view player_name,
         }
     });
 
-    m_timers.try_emplace("under water bubble", 1.0f, [this]() {
+    m_timers.try_emplace("under water bubble", 1.5f, [this]() {
         if (m_player.is_underwater()) {
             auto ans = m_random.random_int(1, 2);
             std::string sound =
@@ -794,6 +794,36 @@ void ClientWorld::update(float delta_time) {
                 player.angle = glm::mix(player.angle, 0.0f, t);
             }
 
+            // walking sound
+            if (player.gait == Gait::STOP) {
+                player.moving_time = 0.0f;
+            } else {
+                player.moving_time += delta_time;
+            }
+            auto play_walk_sound = [&]() {
+                glm::ivec3 block = glm::floor(player.render_pos);
+                block.y -= 1;
+                BlockType id = get_block_tpye(block);
+                if (id == 0) {
+                    return;
+                }
+                std::string name = BlockManager::name_form_id(id);
+                std::string sound = "block/" + name + "/walk.ogg";
+                m_audio.play_3d(sound, player.render_pos);
+            };
+            if (player.gait == Gait::WALK) {
+                if (player.moving_time >= ClientPlayer::WALK_SOUND_INTERVAL) {
+                    player.moving_time = 0.0f;
+                    play_walk_sound();
+                }
+            }
+            if (player.gait == Gait::RUN) {
+                if (player.moving_time >= ClientPlayer::RUN_SOUND_INTERVAL) {
+                    player.moving_time = 0.0f;
+                    play_walk_sound();
+                }
+            }
+
             m_render_player_data.emplace_back(
                 player.name, player.uuid, player.render_pos, player.render_yaw,
                 player.render_pitch, player.gait, player.angle);