feat(fx): play ambient Control sound commands

7 files changed, 573 insertions, 24 deletions

diff --git a/apps/fparkan-game/src/audio.rs b/apps/fparkan-game/src/audio.rs
index 2de6464..a89e275 100644
--- a/apps/fparkan-game/src/audio.rs
+++ b/apps/fparkan-game/src/audio.rs
@@ -629,6 +629,7 @@ pub(crate) struct GameAudio {
     music: Player,
     variations: Player,
     weather_loop: NativeSpatialPlayer,
+    control_sounds: BTreeMap<usize, NativeSpatialPlayer>,
     one_shots: Vec<SpatialOneShot>,
     library: AudioLibrary,
     ambience: AmbienceScheduler,
@@ -672,6 +673,7 @@ impl GameAudio {
             music,
             variations,
             weather_loop,
+            control_sounds: BTreeMap::new(),
             one_shots: Vec::new(),
             library,
             ambience: AmbienceScheduler::new(random_seed(), random_seed()),
@@ -705,6 +707,11 @@ impl GameAudio {
         self.weather_loop
             .set_emitter_position(self.weather_position);
         self.retain_active_one_shots();
+        self.control_sounds.retain(|_, player| !player.empty());
+        for player in self.control_sounds.values() {
+            player.set_left_ear_position(left);
+            player.set_right_ear_position(right);
+        }
         for one_shot in &self.one_shots {
             one_shot.player.set_left_ear_position(left);
             one_shot.player.set_right_ear_position(right);
@@ -825,19 +832,74 @@ impl GameAudio {
             SoundAction::OneShot => {
                 self.retain_active_one_shots();
                 let asset = self.dynamic_sound(&event.archive, &event.name)?;
-                self.one_shots.push(self.new_spatial_one_shot(
+                self.one_shots.push(self.new_spatial_voice(
                     &asset,
                     event.position,
                     volume,
                     min_distance,
                     max_distance,
                     frequency_ratio,
+                    false,
                 )?);
             }
         }
         Ok(())
     }
 
+    /// Each Control command owns its source; it must not replace the rain
+    /// loop or another instance using the same sample.
+    pub(crate) fn handle_control_sound(
+        &mut self,
+        id: usize,
+        event: &SoundEvent,
+    ) -> Result<(), AudioError> {
+        validate_point(event.position, "Control emitter")?;
+        let frequency_ratio = if event.frequency_ratio.is_finite() && event.frequency_ratio > 0.0 {
+            event.frequency_ratio
+        } else {
+            1.0
+        };
+        match event.action {
+            SoundAction::StartLoop | SoundAction::OneShot => {
+                let asset = self.dynamic_sound(&event.archive, &event.name)?;
+                let voice = self.new_spatial_voice(
+                    &asset,
+                    event.position,
+                    event.volume,
+                    event.min_distance,
+                    event.max_distance,
+                    frequency_ratio,
+                    event.action == SoundAction::StartLoop,
+                )?;
+                if let Some(previous) = self.control_sounds.insert(id, voice.player) {
+                    previous.stop();
+                }
+                eprintln!("control_sound_start id={id} resource={}:{} loop={} position={:?} range={}/{} frequency={}", event.archive, event.name, event.action == SoundAction::StartLoop, event.position, event.min_distance, event.max_distance, event.frequency_ratio);
+            }
+            SoundAction::SetLoopVolume => {
+                if let Some(player) = self.control_sounds.get(&id) {
+                    player.set_emitter_position(event.position);
+                    player.set_sound_parameters(event.min_distance, event.max_distance);
+                    player.set_volume(event.volume);
+                    player.set_speed(frequency_ratio);
+                }
+            }
+            SoundAction::StopLoop => {
+                if let Some(player) = self.control_sounds.remove(&id) {
+                    player.stop();
+                    eprintln!("control_sound_stop id={id}");
+                }
+            }
+        }
+        Ok(())
+    }
+
+    pub(crate) fn control_sound_is_playing(&self, id: usize) -> bool {
+        self.control_sounds
+            .get(&id)
+            .is_some_and(|player| !player.empty())
+    }
+
     /// Selects one of the original MUSIC/Track02..10.ogg files and loops it.
     pub(crate) fn play_music_track(&mut self, track: u8) -> Result<(), AudioError> {
         let bytes = self.library.music_bytes(track)?;
@@ -875,6 +937,13 @@ impl GameAudio {
                 one_shot.player.play();
             }
         }
+        for player in self.control_sounds.values() {
+            if paused {
+                player.pause();
+            } else {
+                player.play();
+            }
+        }
     }
 
     /// Focus callback used by the window event loop.
@@ -888,6 +957,9 @@ impl GameAudio {
         self.music.stop();
         self.variations.stop();
         self.weather_loop.stop();
+        for player in self.control_sounds.values() {
+            player.stop();
+        }
         for one_shot in &self.one_shots {
             one_shot.player.stop();
         }
@@ -904,7 +976,7 @@ impl GameAudio {
         Ok(())
     }
 
-    fn new_spatial_one_shot(
+    fn new_spatial_voice(
         &self,
         asset: &SoundAsset,
         emitter: [f32; 3],
@@ -912,6 +984,7 @@ impl GameAudio {
         min_distance: f32,
         max_distance: f32,
         frequency_ratio: f32,
+        looping: bool,
     ) -> Result<SpatialOneShot, AudioError> {
         validate_point(emitter, "emitter")?;
         let (left, right) = ear_positions(self.listener)?;
@@ -919,7 +992,12 @@ impl GameAudio {
         player.set_sound_parameters(min_distance, max_distance);
         player.set_volume(volume);
         player.set_speed(frequency_ratio);
-        player.append(decoder_for(asset)?);
+        let source = decoder_for(asset)?;
+        if looping {
+            player.append(source.repeat_infinite());
+        } else {
+            player.append(source);
+        }
         if self.paused {
             player.pause();
         } else {
@@ -1695,6 +1773,42 @@ mod tests {
             })
             .expect("update original rain loop volume");
         assert_eq!(audio.weather_loop.volume(), 0.5);
+        let mut machine = SoundEvent {
+            archive: "sounds.lib".to_string(),
+            name: "f_gener.wav".to_string(),
+            position: [1.0, 2.0, 3.0],
+            volume: 0.0,
+            min_distance: 15.0,
+            max_distance: 100.0,
+            frequency_ratio: 1.0,
+            action: SoundAction::StartLoop,
+        };
+        audio
+            .handle_control_sound(0, &machine)
+            .expect("first machine");
+        audio
+            .handle_control_sound(1, &machine)
+            .expect("second machine");
+        assert!(audio.control_sound_is_playing(0));
+        assert!(audio.control_sound_is_playing(1));
+        assert!(!audio.weather_loop.empty());
+        audio.set_paused(true);
+        assert!(audio
+            .control_sounds
+            .values()
+            .all(|player| player.is_paused()));
+        audio.set_paused(false);
+        assert!(audio
+            .control_sounds
+            .values()
+            .all(|player| !player.is_paused()));
+        machine.action = SoundAction::StopLoop;
+        audio
+            .handle_control_sound(0, &machine)
+            .expect("stop one machine");
+        assert!(!audio.control_sound_is_playing(0));
+        assert!(audio.control_sound_is_playing(1));
+        assert!(!audio.weather_loop.empty());
         audio
             .update_listener([10.0, 20.0, 30.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0])
             .expect("move listener");
diff --git a/apps/fparkan-game/src/main.rs b/apps/fparkan-game/src/main.rs
index 279fa2c..6101c94 100644
--- a/apps/fparkan-game/src/main.rs
+++ b/apps/fparkan-game/src/main.rs
@@ -18,6 +18,7 @@ use fparkan_assets::{
 use fparkan_fx::ambient_op3::{
     evaluate_op3_type0_command, evaluate_op3_type1_command, evaluate_op3_type2_command,
 };
+use fparkan_fx::ambient_sound::{Op2SoundCommand, Op2SoundState};
 use fparkan_fx::atmosphere::{AtmosphereFrame, TypedAtmosphere};
 use fparkan_fx::environment::{
     decode_env_lightning_fxid, evaluate_op1_point_light_with_basis, Camera as FxCamera,
@@ -707,7 +708,7 @@ struct AmbientEffectMeshPrimitive {
 }
 
 #[derive(Clone, Debug)]
-struct ControlPointLightSlot {
+struct ControlEffectSlot {
     time_mode: u32,
     header_flags: u32,
     random_instance_key: ControlEffectInstanceKey,
@@ -728,6 +729,13 @@ struct ControlPointLightSlot {
     command: FxCommand,
 }
 
+#[derive(Clone, Debug)]
+struct ControlSoundSlot {
+    effect: ControlEffectSlot,
+    command: Op2SoundCommand,
+    state: Op2SoundState,
+}
+
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 struct ControlEffectInstanceKey {
     object_index: usize,
@@ -4617,7 +4625,9 @@ struct StaticPreviewScene {
     materials: Vec<VulkanStaticMaterial>,
     material_animations: Vec<MaterialAnimationBinding>,
     ambient_effect_slots: Vec<AmbientEffectGpuSlot>,
-    control_point_light_slots: Vec<ControlPointLightSlot>,
+    control_point_light_slots: Vec<ControlEffectSlot>,
+    control_sound_slots: Vec<ControlSoundSlot>,
+    unsupported_control_sounds: usize,
     component_pose_buffers: Vec<Vec<Option<NodePoseBuffer>>>,
     component_mount_poses: Vec<Vec<Option<VulkanNodePose>>>,
     dynamic_component_geometry: Vec<Vec<Option<DynamicComponentGeometry>>>,
@@ -5253,8 +5263,8 @@ fn ambient_effect_world_from_component_pose_with_random_shift(
     )
 }
 
-fn control_point_light_world_from_component_pose_with_random_shift(
-    slot: &ControlPointLightSlot,
+fn control_effect_world_from_component_pose_with_random_shift(
+    slot: &ControlEffectSlot,
     component_pose_buffers: &[Vec<Option<NodePoseBuffer>>],
     random_shift: [f32; 3],
 ) -> Option<[[f32; 4]; 4]> {
@@ -5278,7 +5288,7 @@ fn control_point_light_world_from_component_pose_with_random_shift(
 }
 
 fn update_control_point_lights(
-    slots: &mut [ControlPointLightSlot],
+    slots: &mut [ControlEffectSlot],
     component_pose_buffers: &[Vec<Option<NodePoseBuffer>>],
     component_mount_poses: &[Vec<Option<VulkanNodePose>>],
     elapsed_seconds: f32,
@@ -5298,13 +5308,11 @@ fn update_control_point_lights(
             .get(&slot.random_instance_key)
             .copied()
             .unwrap_or_default();
-        let Some(world_from_effect) =
-            control_point_light_world_from_component_pose_with_random_shift(
-                slot,
-                component_pose_buffers,
-                random_sample.accumulated_shift,
-            )
-        else {
+        let Some(world_from_effect) = control_effect_world_from_component_pose_with_random_shift(
+            slot,
+            component_pose_buffers,
+            random_sample.accumulated_shift,
+        ) else {
             continue;
         };
         slot.world_from_effect = world_from_effect;
@@ -5461,7 +5469,9 @@ fn append_initial_control_effect_slots(
     effect_documents: &mut HashMap<String, FxDocument>,
     effect_materials: &mut HashMap<String, PreparedEffectMaterial>,
     slots: &mut Vec<AmbientEffectGpuSlot>,
-    point_light_slots: &mut Vec<ControlPointLightSlot>,
+    point_light_slots: &mut Vec<ControlEffectSlot>,
+    sound_slots: &mut Vec<ControlSoundSlot>,
+    unsupported_sounds: &mut usize,
 ) -> Result<(), String> {
     let Some(point_list) = control.point_list.as_ref() else {
         return Ok(());
@@ -5491,6 +5501,11 @@ fn append_initial_control_effect_slots(
             .get(&key)
             .ok_or_else(|| format!("Control FX {key} was not cached"))?;
         let header = document.header();
+        let sound_commands = document
+            .commands()
+            .iter()
+            .filter(|command| command.opcode == FxOpcode::Op2)
+            .count();
         let duration_seconds = header.duration_seconds;
         if !duration_seconds.is_finite()
             || duration_seconds < 0.0
@@ -5504,6 +5519,7 @@ fn append_initial_control_effect_slots(
             // scale conventions are outside this ambient subset. Leave them
             // unexpanded until their lifetime and transform contract are
             // understood rather than failing the whole mission preview.
+            *unsupported_sounds += sound_commands;
             continue;
         }
         let owner_node_index =
@@ -5515,6 +5531,7 @@ fn append_initial_control_effect_slots(
                         || (*owner_node == 0 && component_pose_buffer.is_none())
                 });
         let Some(owner_node_index) = owner_node_index else {
+            *unsupported_sounds += sound_commands;
             continue;
         };
         let owner_node_pose = control_effect_owner_node_pose(
@@ -5523,6 +5540,7 @@ fn append_initial_control_effect_slots(
             owner_node_index,
         );
         let Some(owner_node_pose) = owner_node_pose else {
+            *unsupported_sounds += sound_commands;
             continue;
         };
         let root_transform = LegacyIron3dEulerTransform {
@@ -5559,8 +5577,8 @@ fn append_initial_control_effect_slots(
         );
 
         for (command_index, command) in document.commands().iter().enumerate() {
-            if ambient_effect_op1_supported(command) {
-                point_light_slots.push(ControlPointLightSlot {
+            if ambient_effect_op1_supported(command) || command.opcode == FxOpcode::Op2 {
+                let slot = ControlEffectSlot {
                     time_mode: header.time_mode,
                     header_flags: header.flags,
                     random_instance_key,
@@ -5579,7 +5597,21 @@ fn append_initial_control_effect_slots(
                     world_from_effect,
                     command_index,
                     command: command.clone(),
-                });
+                };
+                if command.opcode == FxOpcode::Op2 {
+                    if let Some(sound) = Op2SoundCommand::from_command(command) {
+                        sound_slots.push(ControlSoundSlot {
+                            effect: slot,
+                            command: sound,
+                            state: Op2SoundState::default(),
+                        });
+                    } else {
+                        *unsupported_sounds += 1;
+                        eprintln!("unsupported Control Op2 object={object_index} component={component_index} effect={key} command={command_index} (mode, backend parameter or malformed body)");
+                    }
+                } else {
+                    point_light_slots.push(slot);
+                }
                 continue;
             }
             let Some(kind) = ambient_effect_command_kind(command) else {
@@ -5935,7 +5967,8 @@ fn control_effect_instance_seed(
 fn advance_control_effect_random_states(
     states: &mut HashMap<ControlEffectInstanceKey, ControlEffectRandomState>,
     ambient_slots: &[AmbientEffectGpuSlot],
-    point_light_slots: &[ControlPointLightSlot],
+    point_light_slots: &[ControlEffectSlot],
+    sound_slots: &[ControlSoundSlot],
     sample_id: SceneSampleId,
     control_clock_ms: u32,
     elapsed_seconds: f32,
@@ -5958,7 +5991,10 @@ fn advance_control_effect_random_states(
             initial_phase,
         ));
     }
-    for slot in point_light_slots {
+    for slot in point_light_slots
+        .iter()
+        .chain(sound_slots.iter().map(|slot| &slot.effect))
+    {
         let initial_phase = ambient_effect_phase(
             slot.time_mode,
             slot.header_flags,
@@ -7928,6 +7964,8 @@ fn static_preview_mesh_and_materials(
     let mut material_animations = Vec::new();
     let mut ambient_effect_slots = Vec::new();
     let mut control_point_light_slots = Vec::new();
+    let mut control_sound_slots = Vec::new();
+    let mut unsupported_control_sounds = 0;
     let mut effect_documents = HashMap::new();
     let mut effect_materials = HashMap::new();
     let mut component_pose_buffers_by_object = Vec::with_capacity(roots.len());
@@ -8085,6 +8123,8 @@ fn static_preview_mesh_and_materials(
                             &mut effect_materials,
                             &mut ambient_effect_slots,
                             &mut control_point_light_slots,
+                            &mut control_sound_slots,
+                            &mut unsupported_control_sounds,
                         )?;
                     }
                 }
@@ -8231,6 +8271,8 @@ fn static_preview_mesh_and_materials(
                         &mut effect_materials,
                         &mut ambient_effect_slots,
                         &mut control_point_light_slots,
+                        &mut control_sound_slots,
+                        &mut unsupported_control_sounds,
                     )?;
                 }
             }
@@ -8479,6 +8521,8 @@ fn static_preview_mesh_and_materials(
         material_animations,
         ambient_effect_slots,
         control_point_light_slots,
+        control_sound_slots,
+        unsupported_control_sounds,
         component_pose_buffers: component_pose_buffers_by_object,
         component_mount_poses: component_mount_poses_by_object,
         dynamic_component_geometry: dynamic_component_geometry_by_object,
@@ -9262,7 +9306,9 @@ struct StaticVulkanApp {
     materials: Vec<VulkanStaticMaterial>,
     material_animations: Vec<MaterialAnimationBinding>,
     ambient_effect_slots: Vec<AmbientEffectGpuSlot>,
-    control_point_light_slots: Vec<ControlPointLightSlot>,
+    control_point_light_slots: Vec<ControlEffectSlot>,
+    control_sound_slots: Vec<ControlSoundSlot>,
+    unsupported_control_sounds: usize,
     control_effect_random_states: HashMap<ControlEffectInstanceKey, ControlEffectRandomState>,
     component_pose_buffers: Vec<Vec<Option<NodePoseBuffer>>>,
     component_mount_poses: Vec<Vec<Option<VulkanNodePose>>>,
@@ -9367,6 +9413,8 @@ impl StaticVulkanApp {
             material_animations: preview.material_animations,
             ambient_effect_slots: preview.ambient_effect_slots,
             control_point_light_slots: preview.control_point_light_slots,
+            control_sound_slots: preview.control_sound_slots,
+            unsupported_control_sounds: preview.unsupported_control_sounds,
             control_effect_random_states: HashMap::new(),
             component_pose_buffers: preview.component_pose_buffers,
             component_mount_poses: preview.component_mount_poses,
@@ -9454,6 +9502,7 @@ impl StaticVulkanApp {
             })
             .count();
         eprintln!("render_coverage control_op1_jitter_unsupported={randomized_lights} (using authored color and radius; native RNG sampling pending)");
+        eprintln!("render_coverage control_op2_supported={} control_op2_unsupported={} (unsupported timing, backend mode or parameters are skipped)", self.control_sound_slots.len(), self.unsupported_control_sounds);
         eprintln!("render_coverage fog_pass_eligibility_approx={} (global world fog and horizon RGB; native shade-state/color verification pending)", self.world_range_indices.len());
         for &range_index in &self.world_range_indices {
             let range = self
@@ -9840,6 +9889,7 @@ impl StaticVulkanApp {
             &mut self.control_effect_random_states,
             &self.ambient_effect_slots,
             &self.control_point_light_slots,
+            &self.control_sound_slots,
             clock.id,
             control_clock_ms,
             effect_elapsed_seconds,
@@ -10030,6 +10080,47 @@ impl StaticVulkanApp {
             audio
                 .update_listener(camera.position, camera.forward, camera.up)
                 .map_err(|error| format!("update audio listener: {error}"))?;
+            for (id, sound) in self.control_sound_slots.iter_mut().enumerate() {
+                let slot = &mut sound.effect;
+                if slot.owner_component_is_mounted {
+                    slot.mount_pose = self
+                        .component_mount_poses
+                        .get(slot.owner_object_index)
+                        .and_then(|components| components.get(slot.owner_component_index))
+                        .copied()
+                        .flatten();
+                }
+                let random = control_effect_random_samples
+                    .get(&slot.random_instance_key)
+                    .copied()
+                    .unwrap_or_default();
+                let Some(matrix) = control_effect_world_from_component_pose_with_random_shift(
+                    slot,
+                    &self.component_pose_buffers,
+                    random.accumulated_shift,
+                ) else {
+                    continue;
+                };
+                let Some(phase) = ambient_effect_phase(
+                    slot.time_mode,
+                    slot.header_flags,
+                    effect_elapsed_seconds,
+                    slot.duration_seconds,
+                )
+                .map(|phase| native_command_phase(slot.header_flags, phase, random.phase_jitter)) else {
+                    continue;
+                };
+                if let Some(event) = sound.command.update(
+                    &mut sound.state,
+                    phase,
+                    matrix,
+                    audio.control_sound_is_playing(id),
+                ) {
+                    audio
+                        .handle_control_sound(id, &event)
+                        .map_err(|error| format!("play Control sound {id}: {error}"))?;
+                }
+            }
         }
         let environment = if let Some(environment) = self.environment.as_mut() {
             Some(environment.update_cpu(
@@ -13471,7 +13562,7 @@ mod tests {
             table_index: 0,
             row_index: 0,
         };
-        let control_slot = ControlPointLightSlot {
+        let control_slot = ControlEffectSlot {
             time_mode: 1,
             header_flags: 9,
             random_instance_key: key,
@@ -13591,6 +13682,8 @@ mod tests {
             material_animations: vec![material_animation],
             ambient_effect_slots: Vec::new(),
             control_point_light_slots: vec![control_slot],
+            control_sound_slots: Vec::new(),
+            unsupported_control_sounds: 0,
             component_pose_buffers: vec![vec![None]],
             component_mount_poses: vec![vec![None]],
             dynamic_component_geometry: Vec::new(),
@@ -16379,7 +16472,7 @@ mod tests {
 
     #[test]
     fn op1_control_lights_use_native_phase_owner_transform_and_flags() {
-        let mut slot = ControlPointLightSlot {
+        let mut slot = ControlEffectSlot {
             time_mode: 1,
             header_flags: 0,
             random_instance_key: ControlEffectInstanceKey {
@@ -16460,6 +16553,7 @@ mod tests {
             &mut states,
             &[],
             &sibling_slots,
+            &[],
             SceneSampleId::Replay(7),
             150,
             1.5,
@@ -16484,6 +16578,7 @@ mod tests {
                 &mut states,
                 &[],
                 &sibling_slots,
+                &[],
                 SceneSampleId::Replay(7),
                 150,
                 1.5,
@@ -16495,6 +16590,7 @@ mod tests {
             &mut states,
             &[],
             &sibling_slots,
+            &[],
             SceneSampleId::Replay(8),
             200,
             0.5,
diff --git a/crates/fparkan-fx/src/ambient_sound.rs b/crates/fparkan-fx/src/ambient_sound.rs
new file mode 100644
index 0000000..bcc1814
--- /dev/null
+++ b/crates/fparkan-fx/src/ambient_sound.rs
@@ -0,0 +1,288 @@
+//! Opcode-2 sound commands, independent of an audio device.
+
+use crate::environment::{SoundAction, SoundEvent};
+use crate::{FxCommand, FxOpcode};
+
+/// A validated ordinary Op2 command. Modes 1/3 request an unverified backend
+/// flag and are left to the caller's unsupported-command report.
+#[derive(Clone, Debug)]
+pub struct Op2SoundCommand {
+    looping: bool,
+    start: f32,
+    end: f32,
+    position: [f32; 3],
+    position_delta: [f32; 3],
+    min_distance: f32,
+    max_distance: f32,
+    frequency: f32,
+    frequency_delta: f32,
+    archive: String,
+    name: String,
+}
+
+/// Playback crossing state belongs to a command instance, even when several
+/// instances share the same sample.
+#[derive(Clone, Debug, Default)]
+pub struct Op2SoundState {
+    previous_phase: f32,
+}
+
+impl Op2SoundCommand {
+    /// Decodes the supported native modes 0 (once) and 2 (loop).
+    #[must_use]
+    pub fn from_command(command: &FxCommand) -> Option<Self> {
+        let body = command.raw_body.as_ref();
+        if command.opcode != FxOpcode::Op2 || body.len() != 144 {
+            return None;
+        }
+        let mode = u32::from_le_bytes(body[..4].try_into().ok()?);
+        // shortcut: backend flag 0x200 and body+76 need a native playback
+        // comparison before modes 1/3 or nonzero backend parameters are enabled.
+        if !matches!(mode, 0 | 2) || body[76..80] != [0; 4] {
+            return None;
+        }
+        let float = |offset| {
+            let value = f32::from_le_bytes(body[offset..offset + 4].try_into().ok()?);
+            value.is_finite().then_some(value)
+        };
+        let vector = |offset| Some([float(offset)?, float(offset + 4)?, float(offset + 8)?]);
+        let start = float(4)?;
+        let end = float(8)?;
+        let position = vector(12)?;
+        let position_end = vector(24)?;
+        let min_distance = float(60)?;
+        let max_distance = float(64)?;
+        let frequency = float(68)?;
+        let frequency_end = float(72)?;
+        let position_delta = std::array::from_fn(|axis| position_end[axis] - position[axis]);
+        let frequency_delta = frequency_end - frequency;
+        if end <= start
+            || !(end - start).is_finite()
+            || !position_delta.iter().all(|value: &f32| value.is_finite())
+            || !frequency_delta.is_finite()
+            || min_distance < 0.0
+            || max_distance < min_distance
+            || frequency <= 0.0
+            || frequency_end <= 0.0
+        {
+            return None;
+        }
+        let text = |bytes: &[u8]| {
+            let end = bytes
+                .iter()
+                .position(|&byte| byte == 0)
+                .unwrap_or(bytes.len());
+            (!bytes[..end].is_empty()).then(|| String::from_utf8_lossy(&bytes[..end]).into_owned())
+        };
+        Some(Self {
+            looping: mode == 2,
+            start,
+            end,
+            position,
+            position_delta,
+            min_distance,
+            max_distance,
+            frequency,
+            frequency_delta,
+            archive: text(&body[80..112])?,
+            name: text(&body[112..144])?,
+        })
+    }
+
+    /// Evaluates Effect.dll's phase crossings and current source parameters.
+    /// `playing` comes from the audio owner, since a one-shot can finish between
+    /// updates. The matrix maps local command coordinates into world space.
+    #[must_use]
+    pub fn update(
+        &self,
+        state: &mut Op2SoundState,
+        phase: f32,
+        world_from_effect: [[f32; 4]; 4],
+        playing: bool,
+    ) -> Option<SoundEvent> {
+        if !phase.is_finite() || !world_from_effect.iter().flatten().all(|v| v.is_finite()) {
+            return None;
+        }
+        let action = if self.looping {
+            if phase >= self.start && phase <= self.end {
+                if playing {
+                    SoundAction::SetLoopVolume
+                } else {
+                    SoundAction::StartLoop
+                }
+            } else if playing {
+                SoundAction::StopLoop
+            } else {
+                return None;
+            }
+        } else {
+            let crossing_phase = if phase == 1.0 { 0.0 } else { phase };
+            let crossed = state.previous_phase <= crossing_phase
+                && state.previous_phase <= self.start
+                && self.start < crossing_phase;
+            state.previous_phase = crossing_phase;
+            if crossed {
+                SoundAction::OneShot
+            } else if playing {
+                SoundAction::SetLoopVolume
+            } else {
+                return None;
+            }
+        };
+        let t = (phase - self.start) / (self.end - self.start);
+        let local: [f32; 3] =
+            std::array::from_fn(|axis| self.position[axis] + t * self.position_delta[axis]);
+        let position = std::array::from_fn(|axis| {
+            let row = world_from_effect[axis];
+            row[0] * local[0] + row[1] * local[1] + row[2] * local[2] + row[3]
+        });
+        let frequency_ratio = self.frequency + t * self.frequency_delta;
+        if !position.iter().all(|value| value.is_finite()) || !frequency_ratio.is_finite() {
+            return None;
+        }
+        Some(SoundEvent {
+            archive: self.archive.clone(),
+            name: self.name.clone(),
+            position,
+            volume: 1.0,
+            min_distance: self.min_distance,
+            max_distance: self.max_distance,
+            frequency_ratio,
+            action,
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::sync::Arc;
+
+    const IDENTITY: [[f32; 4]; 4] = [
+        [1.0, 0.0, 0.0, 0.0],
+        [0.0, 1.0, 0.0, 0.0],
+        [0.0, 0.0, 1.0, 0.0],
+        [0.0, 0.0, 0.0, 1.0],
+    ];
+
+    fn command(mode: u32) -> FxCommand {
+        let mut body = vec![0; 144];
+        body[..4].copy_from_slice(&mode.to_le_bytes());
+        for (offset, value) in [
+            (4, 0.25_f32),
+            (8, 0.75),
+            (60, 12.0),
+            (64, 80.0),
+            (68, 1.0),
+            (72, 2.0),
+        ] {
+            body[offset..offset + 4].copy_from_slice(&value.to_le_bytes());
+        }
+        body[80..90].copy_from_slice(b"sounds.lib");
+        body[112..122].copy_from_slice(b"f_defl.wav");
+        FxCommand {
+            word: 2,
+            opcode: FxOpcode::Op2,
+            native_flag: false,
+            raw_body: Arc::from(body),
+            resource_refs: vec![],
+        }
+    }
+
+    #[test]
+    fn loop_has_inclusive_boundaries_and_updates_without_restarting() {
+        let command = Op2SoundCommand::from_command(&command(2)).unwrap();
+        let mut state = Op2SoundState::default();
+        assert!(command.update(&mut state, 0.0, IDENTITY, false).is_none());
+        assert_eq!(
+            command
+                .update(&mut state, 0.25, IDENTITY, false)
+                .unwrap()
+                .action,
+            SoundAction::StartLoop
+        );
+        assert_eq!(
+            command
+                .update(&mut state, 0.75, IDENTITY, true)
+                .unwrap()
+                .action,
+            SoundAction::SetLoopVolume
+        );
+        assert_eq!(
+            command
+                .update(&mut state, 0.8, IDENTITY, true)
+                .unwrap()
+                .action,
+            SoundAction::StopLoop
+        );
+        assert!(command.update(&mut state, 0.8, IDENTITY, false).is_none());
+    }
+
+    #[test]
+    fn one_shot_crossing_is_strict_and_rearms_after_phase_one() {
+        let command = Op2SoundCommand::from_command(&command(0)).unwrap();
+        let mut state = Op2SoundState::default();
+        assert!(command.update(&mut state, 0.25, IDENTITY, false).is_none());
+        assert_eq!(
+            command
+                .update(&mut state, 0.3, IDENTITY, false)
+                .unwrap()
+                .action,
+            SoundAction::OneShot
+        );
+        assert_eq!(
+            command
+                .update(&mut state, 0.5, IDENTITY, true)
+                .unwrap()
+                .action,
+            SoundAction::SetLoopVolume
+        );
+        assert!(command.update(&mut state, 0.6, IDENTITY, false).is_none());
+        assert!(command.update(&mut state, 1.0, IDENTITY, false).is_none());
+        assert_eq!(
+            command
+                .update(&mut state, 0.3, IDENTITY, false)
+                .unwrap()
+                .action,
+            SoundAction::OneShot
+        );
+    }
+
+    #[test]
+    fn parameters_keep_native_constant_ranges_and_transform_the_position() {
+        let mut source = command(2);
+        let mut body = source.raw_body.to_vec();
+        body[24..28].copy_from_slice(&4.0_f32.to_le_bytes());
+        source.raw_body = Arc::from(body);
+        let command = Op2SoundCommand::from_command(&source).unwrap();
+        let mut matrix = IDENTITY;
+        matrix[0] = [0.0, -1.0, 0.0, 10.0];
+        matrix[1] = [2.0, 0.0, 0.0, 20.0];
+        let event = command
+            .update(&mut Op2SoundState::default(), 0.5, matrix, false)
+            .unwrap();
+        assert_eq!(event.position, [10.0, 24.0, 0.0]);
+        assert_eq!(
+            (
+                event.min_distance,
+                event.max_distance,
+                event.frequency_ratio
+            ),
+            (12.0, 80.0, 1.5)
+        );
+        assert_eq!(
+            (event.archive.as_str(), event.name.as_str()),
+            ("sounds.lib", "f_defl.wav")
+        );
+    }
+
+    #[test]
+    fn backend_modes_and_malformed_commands_are_explicitly_unsupported() {
+        assert!(Op2SoundCommand::from_command(&command(1)).is_none());
+        let mut source = command(2);
+        let mut body = source.raw_body.to_vec();
+        body[8..12].copy_from_slice(&f32::NAN.to_le_bytes());
+        source.raw_body = Arc::from(body);
+        assert!(Op2SoundCommand::from_command(&source).is_none());
+    }
+}
diff --git a/crates/fparkan-fx/src/lib.rs b/crates/fparkan-fx/src/lib.rs
index 4125a68..af7408a 100644
--- a/crates/fparkan-fx/src/lib.rs
+++ b/crates/fparkan-fx/src/lib.rs
@@ -7,6 +7,7 @@
 //! are backed by runtime-captured evidence.
 
 pub mod ambient_op3;
+pub mod ambient_sound;
 pub mod atmosphere;
 pub mod environment;
 pub mod fx_visual;
diff --git a/docs/appendices/knowledge-boundaries.md b/docs/appendices/knowledge-boundaries.md
index 7c9daae..a575baa 100644
--- a/docs/appendices/knowledge-boundaries.md
+++ b/docs/appendices/knowledge-boundaries.md
@@ -70,6 +70,10 @@ Control Op1 пока использует цвет и радиус без слу
 это явное приближение считается в `render_coverage control_op1_jitter_unsupported`.
 Масштаб радиуса длиной преобразованного направления и нижняя замена 0,01 восстановлены.
 
+Control Op2 воспроизводит modes 0/2; modes 1/3, body+76 и неподдержанные
+time modes/привязки считаются как `render_coverage control_op2_unsupported`.
+Управление фазой экземпляра командами Control остаётся до его подключения в runtime.
+
 Размеры команд, resource references, lifecycle, flags families и используемые
 time modes известны. Не закрыто значение каждого поля body opcodes 1--10,
 отсутствующий во всех проверенных каталогах opcode 6 и точные формулы редких
diff --git a/docs/reference/environment-effects.md b/docs/reference/environment-effects.md
index 45d7725..f3ecfb4 100644
--- a/docs/reference/environment-effects.md
+++ b/docs/reference/environment-effects.md
@@ -218,6 +218,41 @@ OneShot         -> воспроизвести разовый звук молни
 отдельный spatial source, применяет DirectSound range/pan и текущий listener.
 Отсутствие устройства вывода не должно останавливать симуляцию.
 
+### Звуки Control
+
+Команда Op2 может принадлежать не погоде, а экземпляру эффекта на узле модели.
+`fparkan-fx::ambient_sound` хранит её временное окно и предыдущее значение
+фазы. В режиме 0 разовый звук начинается при строгом пересечении начала окна:
+`previous <= start && start < phase`, если фаза движется вперёд. Значение
+`phase == 1` для этой проверки заменяется нулём и подготавливает следующий
+цикл. Режим 2 включает loop на обеих границах окна; внутри окна уже работающий
+источник обновляется, а не запускается заново. Выход за окно останавливает его.
+
+Позиция интерполируется между двумя локальными точками и проходит через ту же
+матрицу владельца, что и графические команды. Минимальная и максимальная
+дистанции остаются постоянными; частота интерполируется по фазе окна.
+Каждая команда получает отдельный источник звука, даже если ресурс совпадает
+с ресурсом соседней команды. Дождь сохраняет свой loop. Перемещение слушателя,
+потеря фокуса и завершение приложения затрагивают все эти источники.
+
+Эти ветви восстановлены в GOG `Effect.dll` (сборка из
+[таблицы бинарников](original-binaries.md)): init RVA `0x12D10`, update
+`0x12EB0`. Живой loop `sounds.lib:f_defl.wav` передаёт в звуковой backend
+диапазон `12/80`, частоту `1` и мировую позицию из матрицы владельца.
+В режиме 2 признак loop берётся из первого DWORD body, а не из command flag.
+
+Обычное создание эффекта Control сохраняет time mode заголовка и задаёт
+постоянную фазу нулём. Raw selector строки служит ID экземпляра, а не номером
+режима времени. Поэтому `f_comp_sfx` с time mode 0 и началом окна `0.001`
+остаётся тихим до управляющей команды Control. Preview такие команды ещё не
+исполняет. Периодические звуки с time mode 2 уже следуют общим часам и текущей
+позе узла. `render_coverage control_op2_supported` считает подготовленные
+команды, а `control_sound_start/stop` показывает фактические переходы.
+
+Неизвестные backend modes 1/3, ненулевое поле body+76, неподдержанное время
+или привязка владельца пропускаются с `render_coverage control_op2_unsupported`.
+Они не заменяются разовым звуком или произвольным loop.
+
 ## Цвет солнца
 
 Солнце берёт цвет спрайта и прозрачность бликов из `palette[10]` расписания
diff --git a/docs/tomes/05-render.md b/docs/tomes/05-render.md
index 72b0685..3f98ac4 100644
--- a/docs/tomes/05-render.md
+++ b/docs/tomes/05-render.md
@@ -845,6 +845,17 @@ projected shadows. Радиус источника масштабируется
 синий свет завода почти незаметным. Неположительный итог заменяется на 0,01.
 Случайные добавки к цвету и радиусу пока явно считаются в
 `render_coverage control_op1_jitter_unsupported`.
+
+Эффект может одновременно рисовать поверхность и издавать звук. Для Op2
+приложение создаёт отдельный звуковой источник у каждого экземпляра команды:
+несколько одинаковых механизмов слышны одновременно и не заменяют дождь.
+Позиция следует анимируемому узлу, а фаза включает, обновляет и останавливает
+loop. Обычная строка Control создаёт экземпляр с нулевой постоянной фазой;
+звуки с таким режимом ожидают отдельной управляющей команды. Периодические
+звуки работают по часам уже в preview. Устройство вывода остаётся в приложении,
+а правила переходов и параметров — в `fparkan-fx::ambient_sound`
+([подробнее](../reference/environment-effects.md#звуки-control)).
+
 Туман также зависит от расстояния нелинейно: между ближней и дальней границами
 движок интерполирует по квадрату дистанции. При границах 0 и 700 точка в 350
 получает четверть тумана, а не половину. Это сохраняет контраст среднего плана.