gameevents.proto

Protobufs / gameevents.proto

Source 2 base game-event protobuf messages. Provides the Source 1-legacy game-event bridge (CMsgSource1LegacyGameEvent), sound-system events (SoS), and surface-decal events. Identified by the EBaseGameEvents enum (200–212).

CS2 build 25218825 · Steam date 2026-09-09 · platform windows-x86_64 · schema format 2.2

Group: Game eventsMessages: 15 top-level, 18 totalEnums: 1 top-level, 1 total

Imports: networkbasetypes.proto

Wire ids

Every message in this file that a wire-id enum constant maps to, by the join rule described on the Protobufs index.

Message	Enum constant	Value
CMsgVDebugGameSessionIDEvent	EBaseGameEvents.GE_VDebugGameSessionIDEvent	200
CMsgPlaceDecalEvent	EBaseGameEvents.GE_PlaceDecalEvent	201
CMsgClearWorldDecalsEvent	EBaseGameEvents.GE_ClearWorldDecalsEvent	202
CMsgClearEntityDecalsEvent	EBaseGameEvents.GE_ClearEntityDecalsEvent	203
CMsgClearDecalsForEntityEvent	EBaseGameEvents.GE_ClearDecalsForEntityEvent	204
CMsgSource1LegacyGameEventList	EBaseGameEvents.GE_Source1LegacyGameEventList	205
CMsgSource1LegacyListenEvents	EBaseGameEvents.GE_Source1LegacyListenEvents	206
CMsgSource1LegacyGameEvent	EBaseGameEvents.GE_Source1LegacyGameEvent	207
CMsgSosStartSoundEvent	EBaseGameEvents.GE_SosStartSoundEvent	208
CMsgSosStopSoundEvent	EBaseGameEvents.GE_SosStopSoundEvent	209
CMsgSosStopSoundEventHash	EBaseGameEvents.GE_SosStopSoundEventHash	212
CMsgSosSetSoundEventParams	EBaseGameEvents.GE_SosSetSoundEventParams	210
CMsgSosSetLibraryStackFields	EBaseGameEvents.GE_SosSetLibraryStackFields	211
CMsgClothStiffenAnimEvent	EBaseGameEvents.GE_ClothStiffenAnimEvent	213
CMsgClothEffectAnimEvent	EBaseGameEvents.GE_ClothEffectAnimEvent	214

Enums

EBaseGameEvents

Base Game Events BaseGame GameEvents GE_VDebugGameSessionIDEvent GE_PlaceDecalEvent GE_ClearWorldDecalsEvent GE_ClearEntityDecalsEvent GE_ClearDecalsForEntityEvent GE_Source1LegacyGameEventList GE_Source1LegacyListenEvents GE_Source1LegacyGameEvent GE_SosStartSoundEvent GE_SosStopSoundEvent GE_SosSetSoundEventParams GE_SosSetLibraryStackFields GE_SosStopSoundEventHash GE_ClothStiffenAnimEvent GE_ClothEffectAnimEvent

Schema entity: EBaseGameEvents

Name	Number	Message
GE_VDebugGameSessionIDEvent	200	CMsgVDebugGameSessionIDEvent
GE_PlaceDecalEvent	201	CMsgPlaceDecalEvent
GE_ClearWorldDecalsEvent	202	CMsgClearWorldDecalsEvent
GE_ClearEntityDecalsEvent	203	CMsgClearEntityDecalsEvent
GE_ClearDecalsForEntityEvent	204	CMsgClearDecalsForEntityEvent
GE_Source1LegacyGameEventList	205	CMsgSource1LegacyGameEventList
GE_Source1LegacyListenEvents	206	CMsgSource1LegacyListenEvents
GE_Source1LegacyGameEvent	207	CMsgSource1LegacyGameEvent
GE_SosStartSoundEvent	208	CMsgSosStartSoundEvent
GE_SosStopSoundEvent	209	CMsgSosStopSoundEvent
GE_SosSetSoundEventParams	210	CMsgSosSetSoundEventParams
GE_SosSetLibraryStackFields	211	CMsgSosSetLibraryStackFields
GE_SosStopSoundEventHash	212	CMsgSosStopSoundEventHash
GE_ClothStiffenAnimEvent	213	CMsgClothStiffenAnimEvent
GE_ClothEffectAnimEvent	214	CMsgClothEffectAnimEvent

Messages

CMsgVDebugGameSessionIDEvent

Msg Debug Game Session ID Event MsgDebug DebugGame GameSession SessionID IDEvent clientid gamesessionid

Debug event that reports the current game-session ID string to a specific client. Used during development to trace session continuity.

Wire id: EBaseGameEvents.GE_VDebugGameSessionIDEvent = 200

Field	Number	Label	Type	Default	Description
clientid	1	optional	int32		Slot index of the client receiving the session-ID debug information.
gamesessionid	2	optional	string		Unique string identifier for the current game session.

CMsgPlaceDecalEvent

Msg Place Decal Event MsgPlace PlaceDecal DecalEvent position normal saxis boneindex flags color random_seed decal_group_name size_override entityhandle material_id sequence_name triangleindex position_objectspace normal_objectspace

Instructs clients to paint a decal (bullet hole, blood splatter, spray) onto a surface or entity in the world.

Wire id: EBaseGameEvents.GE_PlaceDecalEvent = 201

Field	Number	Label	Type	Default	Description
position	1	optional	CMsgVector		World-space hit position where the decal should be placed.
normal	2	optional	CMsgVector		Surface normal at the hit position; orients the decal correctly.
saxis	3	optional	CMsgVector		Secondary axis vector for texture alignment.
boneindex	4	optional	int32		Bone index when the decal is attached to an animated model (-1 for world surfaces).
flags	5	optional	uint32		Decal flags bitmask (temporary, permanent, etc.).
color	6	optional	fixed32		RGBA colour tint applied to the decal texture.
random_seed	7	optional	int32		Random seed used to select from a decal group variant.
decal_group_name	8	optional	uint32		Hash of the decal group name (e.g. 'BulletImpactConcrete').
size_override	9	optional	float		Override size in world units (0 = use default decal size).
entityhandle	10	optional	uint32	16777215	Entity handle to attach the decal to (0xFFFFFF = world).
material_id	11	optional	uint64		Material ID of the surface at the hit point.
sequence_name	12	optional	uint32		Hash of the decal sequence name for animated decals.
triangleindex	13	optional	int32		Mesh triangle index for precise placement on complex geometry.
position_objectspace	14	optional	CMsgVector
normal_objectspace	15	optional	CMsgVector

CMsgClearWorldDecalsEvent

Msg Clear World Decals Event MsgClear ClearWorld WorldDecals DecalsEvent flagstoclear

Removes all world-surface decals matching the given flags (e.g. clears bullet holes at round start).

Wire id: EBaseGameEvents.GE_ClearWorldDecalsEvent = 202

Field	Number	Label	Type	Default	Description
flagstoclear	1	optional	uint32		Bitmask of decal flags; decals with any matching flag will be removed.

CMsgClearEntityDecalsEvent

Msg Clear Entity Decals Event MsgClear ClearEntity EntityDecals DecalsEvent flagstoclear

Removes all decals painted on entity surfaces that match the given flags.

Wire id: EBaseGameEvents.GE_ClearEntityDecalsEvent = 203

Field	Number	Label	Type	Default	Description
flagstoclear	1	optional	uint32		Bitmask of decal flags to clear from all entity surfaces.

CMsgClearDecalsForEntityEvent

Msg Clear Decals For Entity Event MsgClear ClearDecals DecalsFor ForEntity EntityEvent flagstoclear entityhandle

Removes all decals on a specific entity that match the given flags.

Wire id: EBaseGameEvents.GE_ClearDecalsForEntityEvent = 204

Field	Number	Label	Type	Default	Description
flagstoclear	1	optional	uint32		Bitmask of decal flags to clear.
entityhandle	2	optional	uint32	16777215	Handle of the specific entity whose decals should be cleared.

CMsgSource1LegacyGameEventList

Msg Source1 Legacy Game Event List MsgSource1 Source1Legacy LegacyGame GameEvent EventList descriptors

Sent once at the start of a connection to register all Source 1 game-event schemas with the client. The client uses this list to decode subsequent CMsgSource1LegacyGameEvent messages by ID.

This is the Source 2 equivalent of the Source 1 'svc_GameEventList' message. All classic CS:GO game events (player_death, bomb_planted, etc.) are transmitted through this bridge.

Wire id: EBaseGameEvents.GE_Source1LegacyGameEventList = 205

Field	Number	Label	Type	Default	Description
descriptors	1	repeated	CMsgSource1LegacyGameEventList.descriptor_t

CMsgSource1LegacyGameEventList.key_t

key type name

Referenced by (1): CMsgSource1LegacyGameEventList.descriptor_t

Field	Number	Label	Type	Default	Description
type	1	optional	int32
name	2	optional	string

CMsgSource1LegacyGameEventList.descriptor_t

descriptor eventid name keys

Referenced by (1): CMsgSource1LegacyGameEventList

Field	Number	Label	Type	Default	Description
eventid	1	optional	int32
name	2	optional	string
keys	3	repeated	CMsgSource1LegacyGameEventList.key_t

CMsgSource1LegacyListenEvents

Msg Source1 Legacy Listen Events MsgSource1 Source1Legacy LegacyListen ListenEvents playerslot eventarraybits

Registers which Source 1 game-events a specific client wishes to receive. Used by plugins and spectators to opt in to event streams.

Wire id: EBaseGameEvents.GE_Source1LegacyListenEvents = 206

Field	Number	Label	Type	Default	Description
playerslot	1	optional	int32		Player slot that is registering these event listeners.
eventarraybits	2	repeated	uint32		Packed bitmask array; bit N set means listen for game-event with ID N.

CMsgSource1LegacyGameEvent

Msg Source1 Legacy Game Event MsgSource1 Source1Legacy LegacyGame GameEvent event_name eventid keys server_tick passthrough

Carries a single Source 1 game-event (player_death, weapon_fire, bomb_planted, etc.) over the Source 2 network layer. The event-type name and all key–value pairs are encoded inside the keys list.

CS2 game events (player_death, round_start, bomb_exploded, etc.) are all transmitted as CMsgSource1LegacyGameEvent messages. Use the event_name field to identify them and CMsgSource1LegacyGameEventList to decode keys.

Wire id: EBaseGameEvents.GE_Source1LegacyGameEvent = 207

Field	Number	Label	Type	Default	Description
event_name	1	optional	string		String name of the game event (e.g. 'player_death', 'bomb_planted').
eventid	2	optional	int32		Numeric event ID assigned during registration via CMsgSource1LegacyGameEventList.
keys	3	repeated	CMsgSource1LegacyGameEvent.key_t		Typed key–value pairs carrying event-specific data (integers, floats, strings, booleans).
server_tick	4	optional	int32		Server tick on which the event was fired.
passthrough	5	optional	int32		Passthrough flag used internally by the event system.

CMsgSource1LegacyGameEvent.key_t

key type val_string val_float val_long val_short val_byte val_bool val_uint64

Referenced by (1): CMsgSource1LegacyGameEvent

Field	Number	Label	Type	Default	Description
type	1	optional	int32
val_string	2	optional	string
val_float	3	optional	float
val_long	4	optional	int32
val_short	5	optional	int32
val_byte	6	optional	int32
val_bool	7	optional	bool
val_uint64	8	optional	uint64

CMsgSosStartSoundEvent

Msg Sos Start Sound Event MsgSos SosStart StartSound SoundEvent soundevent_guid soundevent_hash source_entity_index seed packed_params start_time

Starts a named sound event through the SoS (Sound Operating System) layer, associated with an optional source entity.

Wire id: EBaseGameEvents.GE_SosStartSoundEvent = 208

Field	Number	Label	Type	Default	Description
soundevent_guid	1	optional	int32		Unique integer handle for this sound instance (used to stop or modify it later).
soundevent_hash	2	optional	fixed32		CRC32 hash of the sound event name string.
source_entity_index	3	optional	int32	-1	Entity index of the sound source (-1 = world/positional).
seed	4	optional	int32		Random seed for sound variation selection.
packed_params	5	optional	bytes		Packed binary parameters for the sound event (volume, pitch, position, etc.).
start_time	6	optional	float		Game time at which the sound should start playing (allows latency compensation).

CMsgSosStopSoundEvent

Msg Sos Stop Sound Event MsgSos SosStop StopSound SoundEvent soundevent_guid

Stops a specific sound instance identified by its GUID.

Wire id: EBaseGameEvents.GE_SosStopSoundEvent = 209

Field	Number	Label	Type	Default	Description
soundevent_guid	1	optional	int32		GUID of the sound instance to stop (matches soundevent_guid from CMsgSosStartSoundEvent).

CMsgSosStopSoundEventHash

Msg Sos Stop Sound Event Hash MsgSos SosStop StopSound SoundEvent EventHash soundevent_hash source_entity_index

Stops all sound instances matching the given sound-event hash on the specified source entity.

Wire id: EBaseGameEvents.GE_SosStopSoundEventHash = 212

Field	Number	Label	Type	Default	Description
soundevent_hash	1	optional	fixed32		CRC32 hash of the sound event name to stop.
source_entity_index	2	optional	int32	-1	Entity index to restrict the stop to (-1 = stop all matching sounds).

CMsgSosSetSoundEventParams

Msg Sos Set Sound Event Params MsgSos SosSet SetSound SoundEvent EventParams soundevent_guid packed_params

Updates runtime parameters of an active sound event without restarting it (e.g. volume fade, pitch shift on a looping ambient sound).

Wire id: EBaseGameEvents.GE_SosSetSoundEventParams = 210

Field	Number	Label	Type	Default	Description
soundevent_guid	1	optional	int32		GUID of the active sound instance to modify.
packed_params	5	optional	bytes		New packed parameter values to apply to the running sound.

CMsgSosSetLibraryStackFields

Msg Sos Set Library Stack Fields MsgSos SosSet SetLibrary LibraryStack StackFields stack_hash packed_fields

Modifies fields in a named sound library stack (a group of sound layers), allowing global sound-mix changes from the server.

Wire id: EBaseGameEvents.GE_SosSetLibraryStackFields = 211

Field	Number	Label	Type	Default	Description
stack_hash	1	optional	fixed32		CRC32 hash of the sound library stack name to modify.
packed_fields	5	optional	bytes		Packed binary field values to apply to the stack.

CMsgClothStiffenAnimEvent

Msg Cloth Stiffen Anim Event MsgCloth ClothStiffen StiffenAnim AnimEvent source_entity_index vertex_set_hash intensity length speed_in speed_out

Wire id: EBaseGameEvents.GE_ClothStiffenAnimEvent = 213

Field	Number	Label	Type	Default	Description
source_entity_index	1	optional	int32	-1
vertex_set_hash	2	optional	int32
intensity	3	optional	float
length	4	optional	float
speed_in	5	optional	float
speed_out	6	optional	float

CMsgClothEffectAnimEvent

Msg Cloth Effect Anim Event MsgCloth ClothEffect EffectAnim AnimEvent source_entity_index effect_name_hash operation flags tags pte

Wire id: EBaseGameEvents.GE_ClothEffectAnimEvent = 214

Field	Number	Label	Type	Default	Description
source_entity_index	1	optional	int32	-1
effect_name_hash	2	optional	int32
operation	3	optional	int32
flags	4	optional	int32
tags	5	optional	string
pte	6	optional	CMsgVector

Reference graph

Message reference graph (5 edges)

flowchart LR
    n0["CMsgPlaceDecalEvent"]
    n1["CMsgVector"]
    n0 --> n1
    n2["CMsgSource1LegacyGameEventList"]
    n3["CMsgSource1LegacyGameEventList.descriptor_t"]
    n2 --> n3
    n4["CMsgSource1LegacyGameEventList.key_t"]
    n3 --> n4
    n5["CMsgSource1LegacyGameEvent"]
    n6["CMsgSource1LegacyGameEvent.key_t"]
    n5 --> n6
    n7["CMsgClothEffectAnimEvent"]
    n7 --> n1