Add spatial audio, spacecraft entity, and level intro sequence

Distance-based sound effects with stereo panning for explosions, impacts,
and pickups. Spacecraft entity with full state machine (fly-in, land, take
off, fly-out), engine/synth sound loops, thruster particles, and PNG
spritesheet. Moon level intro defers player spawn until ship lands.

Also untrack build/ objects that were committed by mistake.

TODO.md

@@ -1,9 +1,15 @@
 # TODO
 
-## Distance-based sound effects
-Sounds (explosions, impacts, etc.) should attenuate based on distance from the
-player. Offscreen events far away should be inaudible. Add a helper that takes
-a world position and scales volume by proximity to the camera/player.
+## ~~Distance-based sound effects~~ ✓
+Implemented: `audio_set_listener()`, `audio_play_sound_at()` with linear
+attenuation and stereo panning. Used by enemy death, asteroid impact, and
+powerup pickup.
+
+## ~~Spacecraft art and entity~~ ✓
+Implemented: spacecraft PNG spritesheet (5 frames, 80x48 each), full entity
+with state machine (FLYING_IN → LANDING → LANDED → TAKEOFF → FLYING_OUT →
+DONE), engine/synth sounds, thruster particles, level intro sequence with
+deferred player spawn.
 
 ## Large map support (5000x5000)
 Audit the engine for anything that breaks or becomes slow at very large map
@@ -15,18 +21,10 @@ sizes. Key areas to check:
 - Camera bounds and coordinate overflow (float precision at large coords)
 - Level file parsing (row lines could exceed fgets buffer at 5000+ columns)
 
-## Spacecraft art and entity
-Create placeholder pixel art for the player's spacecraft (fits the 16x16 grid
-aesthetic but spans multiple cells, roughly 4-5 tiles wide by 2-3 tiles tall).
-Needs at minimum:
-- Landed/idle frame (visible near spawn on planet surface levels)
-- Landing animation (descending + touchdown, 3-4 frames)
-- Takeoff animation (liftoff + ascending, reuse landing in reverse)
-Used in two contexts:
-- **Level start**: ship flies in, lands at spawn, player exits, ship takes off
-  and leaves — serves as the level intro sequence
-- **Level exit**: ship flies in and lands when player nears the exit zone,
-  player enters, ship takes off — triggers level transition
+## Spacecraft at level exit
+Ship landing at exit zone when player approaches — player enters, ship takes
+off, triggers level transition. The intro/start sequence is done; this is the
+exit counterpart.
 
 ## Asteroid refinement
 - Reduce asteroid count significantly — occasional hazard, not a barrage

assets/levels/moon01.lvl

@@ -12,6 +12,8 @@ PARALLAX_STYLE 4
 MUSIC assets/sounds/algardalgar.ogg
 PLAYER_UNARMED
 
+ENTITY spacecraft 1 14
+
 ENTITY asteroid 66 1
 ENTITY asteroid 70 1
 ENTITY asteroid 74 1

src/engine/audio.c

@@ -2,9 +2,17 @@
 #include "config.h"
 #include <SDL2/SDL_mixer.h>
 #include <stdio.h>
+#include <math.h>
 
 static bool s_initialized = false;
 
+/* ── Listener state for spatial audio ────────────── */
+static Vec2 s_listener_pos = {0};
+static bool s_listener_set = false;
+
+/* Default max audible distance in pixels (~40 tiles) */
+#define AUDIO_DEFAULT_MAX_DIST  640.0f
+
 bool audio_init(void) {
     /* Initialize MP3 (and OGG) decoder support */
     int mix_flags = MIX_INIT_MP3 | MIX_INIT_OGG;
@@ -66,9 +74,25 @@ void audio_play_sound(Sound s, int volume) {
     int ch = Mix_PlayChannel(-1, (Mix_Chunk *)s.chunk, 0);
     if (ch >= 0) {
         Mix_Volume(ch, volume);
+        Mix_SetPanning(ch, 255, 255);  /* reset to center (no panning) */
     }
 }
 
+int audio_play_sound_loop(Sound s, int volume) {
+    if (!s_initialized || !s.chunk) return -1;
+    int ch = Mix_PlayChannel(-1, (Mix_Chunk *)s.chunk, -1); /* -1 = loop forever */
+    if (ch >= 0) {
+        Mix_Volume(ch, volume);
+        Mix_SetPanning(ch, 255, 255);  /* reset to center */
+    }
+    return ch;
+}
+
+void audio_stop_channel(int ch) {
+    if (!s_initialized || ch < 0) return;
+    Mix_HaltChannel(ch);
+}
+
 void audio_play_music(Music m, bool loop) {
     if (!s_initialized) {
         fprintf(stderr, "audio_play_music: audio not initialized\n");
@@ -99,11 +123,60 @@ void audio_set_music_volume(int volume) {
     Mix_VolumeMusic(volume);
 }
 
+/* ── Positional / spatial audio ──────────────────── */
+
+void audio_set_listener(Vec2 pos) {
+    s_listener_pos = pos;
+    s_listener_set = true;
+}
+
+void audio_play_sound_at(Sound s, int base_volume, Vec2 world_pos, float max_dist) {
+    if (!s_initialized || !s.chunk) return;
+
+    if (max_dist <= 0.0f) max_dist = AUDIO_DEFAULT_MAX_DIST;
+
+    /* Fall back to non-positional if listener was never set */
+    if (!s_listener_set) {
+        audio_play_sound(s, base_volume);
+        return;
+    }
+
+    float dx = world_pos.x - s_listener_pos.x;
+    float dy = world_pos.y - s_listener_pos.y;
+    float dist = sqrtf(dx * dx + dy * dy);
+
+    /* Inaudible beyond max distance */
+    if (dist >= max_dist) return;
+
+    /* Linear attenuation: full volume at dist=0, silent at max_dist */
+    float atten = 1.0f - (dist / max_dist);
+    int vol = (int)(base_volume * atten);
+    if (vol <= 0) return;
+    if (vol > 128) vol = 128;
+
+    int ch = Mix_PlayChannel(-1, (Mix_Chunk *)s.chunk, 0);
+    if (ch < 0) return;
+
+    Mix_Volume(ch, vol);
+
+    /* Stereo panning: center = 127, hard-left = 0, hard-right = 254.
+     * Pan linearly based on horizontal offset relative to half the
+     * viewport width (~half of SCREEN_WIDTH). */
+    float half_screen = (float)SCREEN_WIDTH * 0.5f;
+    float pan_ratio = dx / half_screen;            /* -1..+1 roughly   */
+    if (pan_ratio < -1.0f) pan_ratio = -1.0f;
+    if (pan_ratio >  1.0f) pan_ratio =  1.0f;
+    Uint8 pan_right = (Uint8)(127 + (int)(pan_ratio * 127.0f));
+    Uint8 pan_left  = 254 - pan_right;
+    Mix_SetPanning(ch, pan_left, pan_right);
+}
+
 void audio_shutdown(void) {
     if (!s_initialized) return;
     Mix_HaltMusic();
     Mix_CloseAudio();
     Mix_Quit();
     s_initialized = false;
+    s_listener_set = false;
     printf("Audio shut down.\n");
 }

src/engine/audio.h

@@ -2,6 +2,7 @@
 #define JNR_AUDIO_H
 
 #include <stdbool.h>
+#include "util/vec2.h"
 
 typedef struct Sound {
     void *chunk;    /* Mix_Chunk* */
@@ -21,4 +22,23 @@ void  audio_free_music(Music *m);
 void  audio_set_music_volume(int volume);       /* 0-128 */
 void  audio_shutdown(void);
 
+/* ── Looping sounds ────────────────────────────── */
+
+/* Play a sound on loop, returns the channel number (or -1 on failure).
+ * Use audio_stop_channel() to stop it later. */
+int   audio_play_sound_loop(Sound s, int volume);
+
+/* Stop a specific channel (from audio_play_sound_loop). No-op if ch < 0. */
+void  audio_stop_channel(int ch);
+
+/* ── Positional / spatial audio ────────────────── */
+
+/* Set the listener position (call once per frame, typically from camera center) */
+void  audio_set_listener(Vec2 pos);
+
+/* Play a sound at a world position. Volume is attenuated by distance from the
+ * listener and stereo-panned based on horizontal offset. Sounds beyond
+ * max_dist are inaudible. Pass max_dist <= 0 for a sensible default. */
+void  audio_play_sound_at(Sound s, int base_volume, Vec2 world_pos, float max_dist);
+
 #endif /* JNR_AUDIO_H */

src/engine/entity.h

@@ -27,6 +27,7 @@ typedef enum EntityType {
     ENT_POWERUP,
     ENT_DRONE,
     ENT_ASTEROID,
+    ENT_SPACECRAFT,
     ENT_TYPE_COUNT
 } EntityType;
 

src/game/entity_registry.c

@@ -5,6 +5,7 @@
 #include "game/hazards.h"
 #include "game/powerup.h"
 #include "game/drone.h"
+#include "game/spacecraft.h"
 #include <string.h>
 #include <stdio.h>
 
@@ -67,6 +68,7 @@ void entity_registry_init(EntityManager *em) {
     powerup_register(em);
     drone_register(em);
     asteroid_register(em);
+    spacecraft_register(em);
 
     /* ════════════════════════════════════════════
      *  REGISTRY TABLE
@@ -92,6 +94,7 @@ void entity_registry_init(EntityManager *em) {
     reg_add("powerup_drone", "Drone Pickup",   spawn_powerup_drone,  (SDL_Color){80, 200, 255, 255},  12, 12);
     reg_add("powerup_gun",   "Gun Pickup",    spawn_powerup_gun,    (SDL_Color){200, 200, 220, 255}, 12, 12);
     reg_add("asteroid",      "Asteroid",      asteroid_spawn,       (SDL_Color){140, 110, 80, 255},  ASTEROID_WIDTH, ASTEROID_HEIGHT);
+    reg_add("spacecraft",    "Spacecraft",    spacecraft_spawn,     (SDL_Color){187, 187, 187, 255}, SPACECRAFT_WIDTH, SPACECRAFT_HEIGHT);
 
     printf("Entity registry: %d types registered\n", g_entity_registry.count);
 }

src/game/hazards.c

@@ -702,7 +702,7 @@ static void asteroid_update(Entity *self, float dt, const Tilemap *map) {
             particle_emit_death_puff(hit_pos, (SDL_Color){140, 110, 80, 255});
 
             if (s_asteroid_sfx_loaded) {
-                audio_play_sound(s_sfx_asteroid_impact, 80);
+                audio_play_sound_at(s_sfx_asteroid_impact, 80, hit_pos, 0);
             }
 
             /* Explode on contact — hide and start respawn */
@@ -729,7 +729,7 @@ static void asteroid_update(Entity *self, float dt, const Tilemap *map) {
         particle_emit_death_puff(impact_pos, (SDL_Color){140, 110, 80, 255});
 
         if (s_asteroid_sfx_loaded) {
-            audio_play_sound(s_sfx_asteroid_impact, 60);
+            audio_play_sound_at(s_sfx_asteroid_impact, 60, impact_pos, 0);
         }
 
         /* Hide and start respawn timer */

src/game/level.c

@@ -5,6 +5,7 @@
 #include "game/hazards.h"
 #include "game/powerup.h"
 #include "game/drone.h"
+#include "game/spacecraft.h"
 #include "game/sprites.h"
 #include "game/entity_registry.h"
 #include "engine/core.h"
@@ -36,7 +37,7 @@ static bool level_setup(Level *level) {
     if (!s_sfx_loaded) {
         s_sfx_hit         = audio_load_sound("assets/sounds/hitHurt.wav");
         s_sfx_enemy_death = audio_load_sound("assets/sounds/teleport.wav");
-        s_sfx_pickup      = audio_load_sound("assets/sounds/teleport.wav");
+        s_sfx_pickup      = audio_load_sound("assets/sounds/powerUp.wav");
         s_sfx_loaded = true;
     }
 
@@ -92,24 +93,31 @@ static bool level_setup(Level *level) {
         (float)(level->map.width * TILE_SIZE),
         (float)(level->map.height * TILE_SIZE));
 
-    /* Spawn player at map spawn point */
+    /* Spawn entities from level data (via registry) */
+    level->has_intro_ship = false;
+    for (int i = 0; i < level->map.entity_spawn_count; i++) {
+        EntitySpawn *es = &level->map.entity_spawns[i];
+        Vec2 pos = vec2(es->x, es->y);
+        entity_registry_spawn(&level->entities, es->type_name, pos);
+        if (strcmp(es->type_name, "spacecraft") == 0) {
+            level->has_intro_ship = true;
+        }
+    }
+
+    /* Spawn player — deferred if the level has an intro spacecraft */
+    if (level->has_intro_ship) {
+        level->player_spawned = false;
+    } else {
         Entity *player = player_spawn(&level->entities, level->map.player_spawn);
         if (!player) {
             fprintf(stderr, "Failed to spawn player!\n");
             return false;
         }
-
-    /* Disarm player if level requests it */
         if (level->map.player_unarmed) {
             PlayerData *ppd = (PlayerData *)player->data;
             if (ppd) ppd->has_gun = false;
         }
-
-    /* Spawn entities from level data (via registry) */
-    for (int i = 0; i < level->map.entity_spawn_count; i++) {
-        EntitySpawn *es = &level->map.entity_spawns[i];
-        Vec2 pos = vec2(es->x, es->y);
-        entity_registry_spawn(&level->entities, es->type_name, pos);
+        level->player_spawned = true;
     }
 
     /* Load level music (playback deferred to first update —
@@ -184,7 +192,7 @@ static void damage_entity(Entity *target, int damage) {
             camera_shake(s_active_camera, 2.0f, 0.15f);
         }
 
-        audio_play_sound(s_sfx_enemy_death, 80);
+        audio_play_sound_at(s_sfx_enemy_death, 80, center, 0);
     }
 }
 
@@ -342,7 +350,7 @@ static void handle_collisions(EntityManager *em) {
                         a->body.pos.y + a->body.size.y * 0.5f
                     );
                     particle_emit_spark(center, (SDL_Color){255, 255, 100, 255});
-                    audio_play_sound(s_sfx_pickup, 80);
+                    audio_play_sound_at(s_sfx_pickup, 80, center, 0);
 
                     /* Destroy the powerup */
                     a->flags |= ENTITY_DEAD;
@@ -403,10 +411,36 @@ void level_update(Level *level, float dt) {
     /* Set camera pointer for collision shake triggers */
     s_active_camera = &level->camera;
 
+    /* ── Deferred player spawn: wait for spacecraft to land ── */
+    if (level->has_intro_ship && !level->player_spawned) {
+        /* Find the spacecraft and check if it has landed */
+        for (int i = 0; i < level->entities.count; i++) {
+            Entity *e = &level->entities.entities[i];
+            if (e->active && e->type == ENT_SPACECRAFT &&
+                spacecraft_is_landed(e)) {
+                /* Ship has landed — spawn the player at spawn point */
+                Entity *player = player_spawn(&level->entities,
+                                              level->map.player_spawn);
+                if (player) {
+                    if (level->map.player_unarmed) {
+                        PlayerData *ppd = (PlayerData *)player->data;
+                        if (ppd) ppd->has_gun = false;
+                    }
+                    level->player_spawned = true;
+
+                    /* Trigger takeoff now that the player has exited */
+                    spacecraft_takeoff(e);
+                }
+                break;
+            }
+        }
+    }
+
     /* Update all entities */
     entity_update_all(&level->entities, dt, &level->map);
 
-    /* Handle collisions */
+    /* Handle collisions (only meaningful once player exists) */
+    if (level->player_spawned) {
         handle_collisions(&level->entities);
 
         /* Check exit zones */
@@ -417,7 +451,6 @@ void level_update(Level *level, float dt) {
             Entity *e = &level->entities.entities[i];
             if (e->active && e->type == ENT_PLAYER && player_wants_respawn(e)) {
                 player_respawn(e, level->map.player_spawn);
-            /* Re-snap camera to player immediately */
                 Vec2 center = vec2(
                     e->body.pos.x + e->body.size.x * 0.5f,
                     e->body.pos.y + e->body.size.y * 0.5f
@@ -426,11 +459,14 @@ void level_update(Level *level, float dt) {
                 break;
             }
         }
+    }
 
     /* Update particles */
     particle_update(dt);
 
-    /* Find player for camera tracking */
+    /* Camera tracking — follow player if spawned, otherwise follow spacecraft */
+    bool cam_tracked = false;
+    if (level->player_spawned) {
         for (int i = 0; i < level->entities.count; i++) {
             Entity *e = &level->entities.entities[i];
             if (e->active && e->type == ENT_PLAYER) {
@@ -440,9 +476,35 @@ void level_update(Level *level, float dt) {
                     e->body.pos.y + e->body.size.y * 0.5f + look_offset
                 );
                 camera_follow(&level->camera, center, e->body.vel, dt);
+                cam_tracked = true;
                 break;
             }
         }
+    }
+    if (!cam_tracked) {
+        /* Follow the spacecraft during intro */
+        for (int i = 0; i < level->entities.count; i++) {
+            Entity *e = &level->entities.entities[i];
+            if (e->active && e->type == ENT_SPACECRAFT) {
+                Vec2 center = vec2(
+                    e->body.pos.x + e->body.size.x * 0.5f,
+                    e->body.pos.y + e->body.size.y * 0.5f
+                );
+                camera_follow(&level->camera, center, vec2_zero(), dt);
+                cam_tracked = true;
+                break;
+            }
+        }
+    }
+
+    /* Set audio listener to camera center */
+    if (cam_tracked) {
+        Vec2 listener = vec2(
+            level->camera.pos.x + level->camera.viewport.x * 0.5f,
+            level->camera.pos.y + level->camera.viewport.y * 0.5f
+        );
+        audio_set_listener(listener);
+    }
 
     /* Update screen shake */
     camera_update_shake(&level->camera, dt);

src/game/level.h

@@ -18,6 +18,10 @@ typedef struct Level {
     /* ── Exit / transition state ─────────── */
     bool          exit_triggered;              /* player entered an exit zone  */
     char          exit_target[ASSET_PATH_MAX]; /* target level path            */
+
+    /* ── Intro sequence state ────────────── */
+    bool          has_intro_ship;              /* level has a spacecraft intro */
+    bool          player_spawned;              /* player has been spawned      */
 } Level;
 
 bool level_load(Level *level, const char *path);

src/game/spacecraft.c

@@ -0,0 +1,372 @@
+#include "game/spacecraft.h"
+#include "engine/assets.h"
+#include "engine/renderer.h"
+#include "engine/particle.h"
+#include "engine/audio.h"
+#include "config.h"
+#include <stdlib.h>
+#include <math.h>
+
+/* ═══════════════════════════════════════════════════
+ *  Constants
+ * ═══════════════════════════════════════════════════ */
+
+#define SC_FLY_SPEED       180.0f  /* px/s during fly-in / fly-out     */
+#define SC_LAND_DURATION   1.6f    /* seconds for the landing sequence */
+#define SC_TAKEOFF_DURATION 1.2f   /* seconds for the takeoff sequence */
+
+/* Spritesheet frame indices (each 80x48, laid out horizontally) */
+#define SC_FRAME_LANDED    0
+#define SC_FRAME_LAND1     1
+#define SC_FRAME_LAND2     2
+#define SC_FRAME_LAND3     3
+#define SC_FRAME_LAND4     4
+#define SC_FRAME_COUNT     5
+
+/* How far off-screen the ship starts / exits */
+#define SC_OFFSCREEN_DIST  200.0f
+
+/* ═══════════════════════════════════════════════════
+ *  Static state
+ * ═══════════════════════════════════════════════════ */
+
+static EntityManager *s_em = NULL;
+static SDL_Texture   *s_texture = NULL;
+static bool           s_texture_loaded = false;
+
+/* ── Sound effects ──────────────────────────────── */
+static Sound s_sfx_engine;
+static Sound s_sfx_synth;
+static bool  s_sfx_loaded = false;
+
+static void load_sfx(void) {
+    if (s_sfx_loaded) return;
+    s_sfx_engine = audio_load_sound("assets/sounds/engine.wav");
+    s_sfx_synth  = audio_load_sound("assets/sounds/synth.wav");
+    s_sfx_loaded = true;
+}
+
+/* ═══════════════════════════════════════════════════
+ *  Helpers
+ * ═══════════════════════════════════════════════════ */
+
+static void load_texture(void) {
+    if (s_texture_loaded) return;
+    s_texture = assets_get_texture("assets/sprites/spacecraft.png");
+    s_texture_loaded = true;
+}
+
+/* Get the source rect for a given frame index (in PNG pixel coords) */
+static SDL_Rect frame_rect(int frame_idx) {
+    return (SDL_Rect){
+        frame_idx * SPACECRAFT_SRC_W, 0,
+        SPACECRAFT_SRC_W, SPACECRAFT_SRC_H
+    };
+}
+
+/* Pick the landing animation frame based on progress (0.0 = start, 1.0 = landed) */
+static int landing_frame(float progress) {
+    if (progress < 0.25f) return SC_FRAME_LAND1;
+    if (progress < 0.50f) return SC_FRAME_LAND2;
+    if (progress < 0.75f) return SC_FRAME_LAND3;
+    if (progress < 0.95f) return SC_FRAME_LAND4;
+    return SC_FRAME_LANDED;
+}
+
+/* Pick the takeoff animation frame (reverse of landing) */
+static int takeoff_frame(float progress) {
+    return landing_frame(1.0f - progress);
+}
+
+/* Emit thruster particles behind the ship */
+static void emit_thruster_particles(Vec2 ship_pos, float intensity) {
+    if (intensity <= 0.0f) return;
+
+    /* Particles emit from the left (rear) center of the ship */
+    Vec2 origin = vec2(
+        ship_pos.x + 8.0f,
+        ship_pos.y + SPACECRAFT_HEIGHT * 0.5f
+    );
+
+    int count = (int)(intensity * 3.0f);
+    if (count < 1) count = 1;
+
+    ParticleBurst b = {
+        .origin     = origin,
+        .count      = count,
+        .speed_min  = 30.0f * intensity,
+        .speed_max  = 80.0f * intensity,
+        .life_min   = 0.1f,
+        .life_max   = 0.3f,
+        .size_min   = 1.0f,
+        .size_max   = 2.5f,
+        .spread     = 0.6f,
+        .direction  = 3.14159f,  /* leftward */
+        .drag       = 2.0f,
+        .gravity_scale = 0.0f,
+        .color      = (SDL_Color){255, 180, 50, 200},
+        .color_vary = true,
+    };
+    particle_emit(&b);
+}
+
+/* ═══════════════════════════════════════════════════
+ *  Entity callbacks
+ * ═══════════════════════════════════════════════════ */
+
+/* Start the engine loop sound, stopping any previous one */
+static void engine_start(SpacecraftData *sd) {
+    if (sd->engine_channel >= 0) return; /* already playing */
+    sd->engine_channel = audio_play_sound_loop(s_sfx_engine, 70);
+}
+
+/* Stop the engine loop sound */
+static void engine_stop(SpacecraftData *sd) {
+    if (sd->engine_channel < 0) return;
+    audio_stop_channel(sd->engine_channel);
+    sd->engine_channel = -1;
+}
+
+static void spacecraft_update(Entity *self, float dt, const Tilemap *map) {
+    (void)map;
+    SpacecraftData *sd = (SpacecraftData *)self->data;
+    if (!sd) return;
+
+    sd->state_timer += dt;
+
+    switch (sd->state) {
+
+    case SC_FLYING_IN: {
+        /* Move from start_pos toward target_pos */
+        Vec2 dir = vec2_sub(sd->target_pos, sd->start_pos);
+        float total_dist = vec2_len(dir);
+        if (total_dist < 1.0f) {
+            /* Already at target */
+            engine_stop(sd);
+            sd->state = SC_LANDING;
+            sd->state_timer = 0.0f;
+            self->body.pos = sd->target_pos;
+            break;
+        }
+        Vec2 norm = vec2_scale(dir, 1.0f / total_dist);
+
+        float traveled = sd->state_timer * sd->fly_speed;
+        if (traveled >= total_dist) {
+            /* Arrived at landing zone */
+            engine_stop(sd);
+            self->body.pos = sd->target_pos;
+            sd->state = SC_LANDING;
+            sd->state_timer = 0.0f;
+        } else {
+            self->body.pos = vec2_add(sd->start_pos,
+                                      vec2_scale(norm, traveled));
+            emit_thruster_particles(self->body.pos, 1.0f);
+        }
+        break;
+    }
+
+    case SC_LANDING: {
+        float progress = sd->state_timer / SC_LAND_DURATION;
+        if (progress >= 1.0f) {
+            progress = 1.0f;
+            self->body.pos = sd->target_pos;
+            sd->state = SC_LANDED;
+            sd->state_timer = 0.0f;
+            /* Play synth on touchdown */
+            audio_play_sound(s_sfx_synth, 80);
+        } else {
+            /* Ease down from slightly above target to target */
+            float height_offset = (1.0f - progress) * 30.0f;
+            self->body.pos = vec2(
+                sd->target_pos.x,
+                sd->target_pos.y - height_offset
+            );
+            emit_thruster_particles(self->body.pos, 1.0f - progress);
+        }
+        break;
+    }
+
+    case SC_LANDED: {
+        self->body.pos = sd->target_pos;
+        /* Stays landed until spacecraft_takeoff() is called externally
+         * (e.g. by level.c after spawning the player). */
+        break;
+    }
+
+    case SC_TAKEOFF: {
+        float progress = sd->state_timer / SC_TAKEOFF_DURATION;
+        if (progress >= 1.0f) {
+            sd->state = SC_FLYING_OUT;
+            sd->state_timer = 0.0f;
+            engine_start(sd);
+        } else {
+            float height_offset = progress * 30.0f;
+            self->body.pos = vec2(
+                sd->target_pos.x,
+                sd->target_pos.y - height_offset
+            );
+            emit_thruster_particles(self->body.pos, progress);
+        }
+        break;
+    }
+
+    case SC_FLYING_OUT: {
+        /* Fly upward and to the right, off-screen */
+        float speed = sd->fly_speed * 1.5f;
+        self->body.pos.x += speed * 0.7f * dt;
+        self->body.pos.y -= speed * dt;
+
+        emit_thruster_particles(self->body.pos, 1.0f);
+
+        /* Check if far enough off-screen */
+        if (self->body.pos.y < -SC_OFFSCREEN_DIST ||
+            self->body.pos.x > sd->target_pos.x + SC_OFFSCREEN_DIST * 2.0f) {
+            engine_stop(sd);
+            sd->state = SC_DONE;
+            sd->state_timer = 0.0f;
+        }
+        break;
+    }
+
+    case SC_DONE:
+        /* Remove the entity */
+        entity_destroy(s_em, self);
+        return;
+    }
+}
+
+static void spacecraft_render(Entity *self, const Camera *cam) {
+    (void)cam;
+    SpacecraftData *sd = (SpacecraftData *)self->data;
+    if (!sd || !s_texture) return;
+
+    /* Determine which frame to show */
+    int frame = SC_FRAME_LANDED;
+    switch (sd->state) {
+    case SC_FLYING_IN:
+        frame = SC_FRAME_LAND1;  /* thrusters on while flying */
+        break;
+    case SC_LANDING: {
+        float progress = sd->state_timer / SC_LAND_DURATION;
+        if (progress > 1.0f) progress = 1.0f;
+        frame = landing_frame(progress);
+        break;
+    }
+    case SC_LANDED:
+        frame = SC_FRAME_LANDED;
+        break;
+    case SC_TAKEOFF: {
+        float progress = sd->state_timer / SC_TAKEOFF_DURATION;
+        if (progress > 1.0f) progress = 1.0f;
+        frame = takeoff_frame(progress);
+        break;
+    }
+    case SC_FLYING_OUT:
+        frame = SC_FRAME_LAND1;
+        break;
+    case SC_DONE:
+        return;
+    }
+
+    SDL_Rect src = frame_rect(frame);
+
+    Sprite spr = {
+        .texture  = s_texture,
+        .src      = src,
+        .pos      = self->body.pos,
+        .size     = vec2(SPACECRAFT_WIDTH, SPACECRAFT_HEIGHT),
+        .flip_x   = false,
+        .flip_y   = false,
+        .layer    = LAYER_ENTITIES,
+        .alpha    = 255,
+        .rotation = 0.0,
+    };
+    renderer_submit(&spr);
+}
+
+static void spacecraft_destroy(Entity *self) {
+    if (self->data) {
+        SpacecraftData *sd = (SpacecraftData *)self->data;
+        engine_stop(sd);
+        free(self->data);
+        self->data = NULL;
+    }
+}
+
+/* ═══════════════════════════════════════════════════
+ *  Public API
+ * ═══════════════════════════════════════════════════ */
+
+void spacecraft_register(EntityManager *em) {
+    entity_register(em, ENT_SPACECRAFT,
+                    spacecraft_update, spacecraft_render, spacecraft_destroy);
+    s_em = em;
+    load_texture();
+    load_sfx();
+}
+
+Entity *spacecraft_spawn(EntityManager *em, Vec2 land_pos) {
+    load_texture();
+
+    /* land_pos is the top-left of where the ship should rest on the
+     * ground (as provided by the ENTITY directive in .lvl files). */
+    Vec2 target = land_pos;
+
+    /* Start off-screen: above and to the right */
+    Vec2 start = vec2(
+        target.x + SC_OFFSCREEN_DIST,
+        target.y - SC_OFFSCREEN_DIST
+    );
+
+    Entity *e = entity_spawn(em, ENT_SPACECRAFT, start);
+    if (!e) return NULL;
+
+    e->body.size = vec2(SPACECRAFT_WIDTH, SPACECRAFT_HEIGHT);
+    e->body.gravity_scale = 0.0f;  /* manual movement, no physics */
+    e->health = 999;
+    e->max_health = 999;
+    e->damage = 0;
+    e->flags |= ENTITY_INVINCIBLE;
+
+    SpacecraftData *sd = calloc(1, sizeof(SpacecraftData));
+    if (!sd) {
+        entity_destroy(em, e);
+        return NULL;
+    }
+    sd->state = SC_FLYING_IN;
+    sd->state_timer = 0.0f;
+    sd->target_pos = target;
+    sd->start_pos = start;
+    sd->fly_speed = SC_FLY_SPEED;
+    sd->is_exit_ship = false;
+    sd->engine_channel = -1;
+    e->data = sd;
+
+    /* Start engine sound for fly-in */
+    engine_start(sd);
+
+    printf("Spacecraft spawned (fly-in to %.0f, %.0f)\n",
+           target.x, target.y);
+    return e;
+}
+
+void spacecraft_takeoff(Entity *ship) {
+    if (!ship || !ship->data) return;
+    SpacecraftData *sd = (SpacecraftData *)ship->data;
+    if (sd->state == SC_LANDED) {
+        sd->state = SC_TAKEOFF;
+        sd->state_timer = 0.0f;
+    }
+}
+
+bool spacecraft_is_done(const Entity *ship) {
+    if (!ship || !ship->data) return true;
+    const SpacecraftData *sd = (const SpacecraftData *)ship->data;
+    return sd->state == SC_DONE;
+}
+
+bool spacecraft_is_landed(const Entity *ship) {
+    if (!ship || !ship->data) return false;
+    const SpacecraftData *sd = (const SpacecraftData *)ship->data;
+    return sd->state == SC_LANDED;
+}

src/game/spacecraft.h

@@ -0,0 +1,70 @@
+#ifndef JNR_SPACECRAFT_H
+#define JNR_SPACECRAFT_H
+
+#include "engine/entity.h"
+#include "engine/animation.h"
+
+/* ═══════════════════════════════════════════════════
+ *  Spacecraft
+ *
+ *  The player's ship. Appears at level start (fly-in
+ *  and landing sequence) and at exit zones (landing
+ *  and fly-out when the player reaches the exit).
+ *
+ *  Spritesheet: assets/sprites/spacecraft.png
+ *  Layout: 5 frames at 80x48, horizontal strip
+ *    0 = landed/idle
+ *    1 = landing frame 1 (high, bright thrusters)
+ *    2 = landing frame 2 (mid, medium thrusters)
+ *    3 = landing frame 3 (low, dim thrusters)
+ *    4 = landing frame 4 (touchdown)
+ * ═══════════════════════════════════════════════════ */
+
+/* Source sprite dimensions (pixels in PNG) */
+#define SPACECRAFT_SRC_W   80
+#define SPACECRAFT_SRC_H   48
+
+/* Render scale — drawn larger than the source art */
+#define SPACECRAFT_SCALE   2.0f
+
+/* Rendered dimensions (used for hitbox/positioning) */
+#define SPACECRAFT_WIDTH   ((int)(SPACECRAFT_SRC_W * SPACECRAFT_SCALE))
+#define SPACECRAFT_HEIGHT  ((int)(SPACECRAFT_SRC_H * SPACECRAFT_SCALE))
+
+/* State machine */
+typedef enum SpacecraftState {
+    SC_FLYING_IN,      /* approaching from off-screen        */
+    SC_LANDING,        /* playing landing animation          */
+    SC_LANDED,         /* on the ground, idle                */
+    SC_TAKEOFF,        /* playing takeoff animation (reverse landing) */
+    SC_FLYING_OUT,     /* departing off-screen               */
+    SC_DONE            /* sequence complete, can be removed  */
+} SpacecraftState;
+
+typedef struct SpacecraftData {
+    SpacecraftState state;
+    float           state_timer;      /* time spent in current state   */
+    Vec2            target_pos;       /* where to land (ground level)  */
+    Vec2            start_pos;        /* fly-in origin (off-screen)    */
+    float           fly_speed;        /* pixels/s during fly in/out    */
+    bool            is_exit_ship;     /* true = exit ship, false = intro ship */
+    int             engine_channel;   /* SDL_mixer channel for engine loop, -1 = none */
+} SpacecraftData;
+
+/* Register the spacecraft entity type */
+void spacecraft_register(EntityManager *em);
+
+/* Spawn a spacecraft that will fly in and land at the given position.
+ * The position is the bottom-center of where the ship should land. */
+Entity *spacecraft_spawn(EntityManager *em, Vec2 land_pos);
+
+/* Trigger takeoff on an existing landed spacecraft */
+void spacecraft_takeoff(Entity *ship);
+
+/* Check if the spacecraft has finished its full sequence */
+bool spacecraft_is_done(const Entity *ship);
+
+/* Check if the spacecraft is in the landed state */
+bool spacecraft_is_landed(const Entity *ship);
+
+#endif /* JNR_SPACECRAFT_H */

tools/gen_spacecraft.py

@@ -0,0 +1,360 @@
+#!/usr/bin/env python3
+"""Generate spacecraft spritesheet PNG for the JNR engine.
+
+Output: assets/sprites/spacecraft.png
+Layout: 5 frames horizontally, each 80x48 pixels = 400x48 total
+Frames: landed, landing1, landing2, landing3, landing4
+
+The ship faces RIGHT, uses the game's pixel art color palette.
+"""
+
+from PIL import Image
+
+# ── Color palette (RGBA) ─────────────────────────────
+T   = (0, 0, 0, 0)         # transparent
+BLK = (26, 26, 46, 255)    # dark/outline
+WHT = (238, 238, 234, 255) # white
+GRY = (136, 136, 136, 255) # grey
+GYD = (85, 85, 85, 255)    # grey dark
+GYL = (187, 187, 187, 255) # grey light
+BLU = (74, 124, 189, 255)  # blue accent
+BLD = (54, 94, 143, 255)   # blue dark
+BLL = (111, 168, 220, 255) # blue light
+CYN = (77, 208, 225, 255)  # cyan cockpit
+CYD = (0, 172, 193, 255)   # cyan dark
+ORG = (255, 152, 0, 255)   # orange
+ORD = (204, 122, 0, 255)   # orange dark
+YLW = (255, 213, 79, 255)  # yellow
+RED = (217, 68, 68, 255)   # red
+
+W, H = 80, 48  # frame size
+
+
+def make_frame():
+    """Return a blank 80x48 pixel grid."""
+    return [[T] * W for _ in range(H)]
+
+
+def hline(grid, y, x0, x1, color):
+    """Draw horizontal line from x0 to x1 inclusive."""
+    if y < 0 or y >= H:
+        return
+    for x in range(max(0, x0), min(W, x1 + 1)):
+        grid[y][x] = color
+
+
+def pixel(grid, x, y, color):
+    """Set a single pixel."""
+    if 0 <= x < W and 0 <= y < H:
+        grid[y][x] = color
+
+
+def draw_ship_body(grid, oy=0):
+    """Draw the main spacecraft hull, offset vertically by oy pixels.
+
+    Ship anatomy (facing right):
+    - Engine block: cols 10-18, thick rear
+    - Main fuselage: cols 18-58, ~10px tall
+    - Cockpit: cols 58-66, with CYN canopy
+    - Nose: cols 66-72, pointed tip
+    - Upper fin: cols 22-38, extends upward
+    - Lower fin: cols 22-38, extends downward
+    """
+    cy = 23 + oy  # vertical center of fuselage
+
+    # ── Main fuselage (rows cy-5 to cy+4 = 10px tall) ──
+    for dy in range(-5, 5):
+        y = cy + dy
+        # Fuselage hull
+        if dy == -5:
+            # Top edge — light highlight
+            hline(grid, y, 20, 60, GYL)
+        elif dy == 4:
+            # Bottom edge — dark shadow
+            hline(grid, y, 20, 60, BLK)
+        elif dy == -4:
+            hline(grid, y, 18, 62, GYL)
+        elif dy == 3:
+            hline(grid, y, 18, 62, GYD)
+        elif dy == -1 or dy == 0:
+            # Blue racing stripe through center
+            hline(grid, y, 16, 64, BLU)
+        elif dy == -2:
+            hline(grid, y, 17, 63, GRY)
+        elif dy == 1:
+            hline(grid, y, 17, 63, GRY)
+        elif dy == 2:
+            hline(grid, y, 18, 62, GYD)
+        elif dy == -3:
+            hline(grid, y, 19, 61, GRY)
+
+    # ── Engine block (rear, left side) ──
+    for dy in range(-6, 7):
+        y = cy + dy
+        if -6 <= dy <= 6:
+            # Engine nacelle housing
+            if abs(dy) <= 3:
+                hline(grid, y, 10, 18, GYD)
+            elif abs(dy) <= 5:
+                hline(grid, y, 12, 18, GYD)
+            elif abs(dy) == 6:
+                hline(grid, y, 14, 17, GYD)
+
+    # Engine inner dark (thruster openings)
+    for dy in range(-3, 4):
+        y = cy + dy
+        if abs(dy) <= 2:
+            hline(grid, y, 10, 12, BLK)
+        elif abs(dy) == 3:
+            pixel(grid, 11, y, BLK)
+            pixel(grid, 12, y, BLK)
+
+    # Engine highlight on top
+    hline(grid, cy - 4, 13, 17, GRY)
+    hline(grid, cy - 5, 14, 17, GRY)
+
+    # ── Cockpit canopy ──
+    # Canopy frame (CYD) and glass (CYN)
+    for dy in range(-4, 3):
+        y = cy + dy
+        if dy == -4:
+            hline(grid, y, 58, 63, CYD)
+        elif dy == -3:
+            hline(grid, y, 59, 65, CYD)
+            hline(grid, y, 60, 64, CYN)
+        elif dy == -2:
+            hline(grid, y, 60, 66, CYD)
+            hline(grid, y, 61, 65, CYN)
+            pixel(grid, 63, y, WHT)  # glint
+        elif dy == -1:
+            hline(grid, y, 61, 67, CYD)
+            hline(grid, y, 62, 66, CYN)
+        elif dy == 0:
+            hline(grid, y, 61, 67, CYD)
+            hline(grid, y, 62, 66, CYN)
+            pixel(grid, 64, y, WHT)  # glint
+        elif dy == 1:
+            hline(grid, y, 60, 66, CYD)
+            hline(grid, y, 61, 65, CYN)
+        elif dy == 2:
+            hline(grid, y, 58, 64, CYD)
+
+    # ── Nose (pointed tip facing right) ──
+    for dy in range(-3, 4):
+        y = cy + dy
+        if dy == 0:
+            hline(grid, y, 66, 73, GYL)  # center line
+        elif abs(dy) == 1:
+            hline(grid, y, 66, 71, GRY)
+        elif abs(dy) == 2:
+            hline(grid, y, 65, 69, GYD)
+        elif abs(dy) == 3:
+            hline(grid, y, 65, 67, BLK)
+
+    # Nose tip highlight
+    pixel(grid, 73, cy, WHT)
+    pixel(grid, 72, cy, WHT)
+
+    # ── Upper wing fin ──
+    for i in range(8):
+        y = cy - 6 - i
+        x0 = 26 + i
+        x1 = 40 - i
+        if x0 <= x1:
+            hline(grid, y, x0, x1, GYD)
+            # Highlight top edge
+            if i < 7:
+                pixel(grid, x0, y, GYL)
+            # BLU accent
+            if x1 - x0 > 2:
+                pixel(grid, (x0 + x1) // 2, y, BLU)
+
+    # Wing fin tip accent
+    pixel(grid, 33, cy - 13, BLU)
+
+    # ── Lower wing fin ──
+    for i in range(8):
+        y = cy + 5 + i
+        x0 = 26 + i
+        x1 = 40 - i
+        if x0 <= x1:
+            hline(grid, y, x0, x1, GYD)
+            # Shadow bottom edge
+            if i < 7:
+                pixel(grid, x0, y, BLK)
+            # BLU accent
+            if x1 - x0 > 2:
+                pixel(grid, (x0 + x1) // 2, y, BLD)
+
+    # ── Panel detail lines ──
+    for dy in [-3, 2]:
+        y = cy + dy
+        for x in [30, 42, 52]:
+            pixel(grid, x, y, GYD if dy < 0 else BLK)
+
+
+def draw_landing_gear(grid, oy=0, length=4):
+    """Draw two landing gear struts below the hull."""
+    cy = 23 + oy
+    gear_top = cy + 5  # just below hull bottom
+
+    # Front gear (col 52)
+    for dy in range(length):
+        y = gear_top + dy
+        pixel(grid, 52, y, GYD)
+        pixel(grid, 53, y, GYD)
+    # Foot
+    hline(grid, gear_top + length, 51, 54, BLK)
+
+    # Rear gear (col 26)
+    for dy in range(length):
+        y = gear_top + dy
+        pixel(grid, 26, y, GYD)
+        pixel(grid, 27, y, GYD)
+    # Foot
+    hline(grid, gear_top + length, 25, 28, BLK)
+
+
+def draw_thrusters(grid, oy=0, intensity=0):
+    """Draw thruster flames behind the engine.
+
+    intensity: 0=off, 1=dim, 2=medium, 3=bright
+    """
+    if intensity == 0:
+        return
+
+    cy = 23 + oy
+
+    if intensity >= 3:
+        # Bright: long flame with white core
+        for dy in range(-2, 3):
+            y = cy + dy
+            if abs(dy) == 0:
+                hline(grid, y, 1, 9, YLW)
+                hline(grid, y, 3, 7, WHT)
+            elif abs(dy) == 1:
+                hline(grid, y, 3, 9, ORG)
+                hline(grid, y, 4, 8, YLW)
+            elif abs(dy) == 2:
+                hline(grid, y, 5, 9, ORD)
+        # Flame tip flicker
+        pixel(grid, 1, cy, WHT)
+        pixel(grid, 2, cy, YLW)
+    elif intensity >= 2:
+        # Medium flame
+        for dy in range(-1, 2):
+            y = cy + dy
+            if dy == 0:
+                hline(grid, y, 4, 9, YLW)
+                hline(grid, y, 5, 8, WHT)
+            else:
+                hline(grid, y, 5, 9, ORG)
+                hline(grid, y, 6, 8, YLW)
+        pixel(grid, 4, cy - 2, ORD)
+        pixel(grid, 4, cy + 2, ORD)
+    elif intensity >= 1:
+        # Dim glow
+        for dy in range(-1, 2):
+            y = cy + dy
+            if dy == 0:
+                hline(grid, y, 7, 9, ORD)
+                pixel(grid, 8, y, ORG)
+            else:
+                pixel(grid, 8, y, ORD)
+                pixel(grid, 9, y, ORD)
+
+
+def apply_tilt(grid, tilt_pixels):
+    """Shift the left side of the image down by tilt_pixels to simulate
+    nose-up tilt. This is a crude per-column vertical shift."""
+    if tilt_pixels == 0:
+        return grid
+
+    new_grid = make_frame()
+    for x in range(W):
+        # Linear interpolation: left edge shifts down by tilt_pixels,
+        # right edge stays the same
+        shift = int(tilt_pixels * (1.0 - x / W))
+        for y in range(H):
+            src_y = y - shift
+            if 0 <= src_y < H:
+                new_grid[y][x] = grid[src_y][x]
+    return new_grid
+
+
+def make_landed():
+    """Frame: ship landed on ground, gear down, no thrust."""
+    grid = make_frame()
+    draw_ship_body(grid, oy=0)
+    draw_landing_gear(grid, oy=0, length=5)
+    return grid
+
+
+def make_landing1():
+    """Frame 1: ship high, tilted nose-up, bright thrusters."""
+    grid = make_frame()
+    draw_ship_body(grid, oy=-8)
+    draw_thrusters(grid, oy=-8, intensity=3)
+    grid = apply_tilt(grid, 3)
+    return grid
+
+
+def make_landing2():
+    """Frame 2: ship lower, less tilt, medium thrusters."""
+    grid = make_frame()
+    draw_ship_body(grid, oy=-4)
+    draw_thrusters(grid, oy=-4, intensity=2)
+    grid = apply_tilt(grid, 1)
+    return grid
+
+
+def make_landing3():
+    """Frame 3: ship nearly level, near ground, gear extending, dim thrusters."""
+    grid = make_frame()
+    draw_ship_body(grid, oy=-2)
+    draw_landing_gear(grid, oy=-2, length=3)
+    draw_thrusters(grid, oy=-2, intensity=1)
+    return grid
+
+
+def make_landing4():
+    """Frame 4: ship touching down, gear extended, no thrust."""
+    grid = make_frame()
+    draw_ship_body(grid, oy=0)
+    draw_landing_gear(grid, oy=0, length=5)
+    # Nearly identical to landed — maybe a very slight glow
+    pixel(grid, 9, 23, ORD)  # residual engine heat
+    return grid
+
+
+def grid_to_image(grid):
+    """Convert a pixel grid to a PIL Image."""
+    img = Image.new("RGBA", (W, H), (0, 0, 0, 0))
+    for y in range(H):
+        for x in range(W):
+            img.putpixel((x, y), grid[y][x])
+    return img
+
+
+def main():
+    frames = [
+        make_landed(),
+        make_landing1(),
+        make_landing2(),
+        make_landing3(),
+        make_landing4(),
+    ]
+
+    # Combine into horizontal spritesheet
+    sheet = Image.new("RGBA", (W * len(frames), H), (0, 0, 0, 0))
+    for i, frame in enumerate(frames):
+        img = grid_to_image(frame)
+        sheet.paste(img, (i * W, 0))
+
+    out_path = "assets/sprites/spacecraft.png"
+    sheet.save(out_path)
+    print(f"Saved spritesheet: {out_path} ({sheet.width}x{sheet.height})")
+
+
+if __name__ == "__main__":
+    main()