336 lines
11 KiB
Go
336 lines
11 KiB
Go
package battleroyale
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import (
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"context"
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"danmaku/ffi"
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"database/sql"
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"encoding/json"
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"github.com/heroiclabs/nakama-common/runtime"
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"math"
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"slices"
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)
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const (
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MATCH_LOADING = iota
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MATCH_START
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STATE_UPDATE
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FINAL_PHASE
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MATCH_END
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)
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const (
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BULLET_LINEAR = 0
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)
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const (
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STAGE_WIDTH float64 = 90.0
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STAGE_HEIGHT float64 = 160.0
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BULLET_KILL_BUFFER_WIDTH float64 = 16.0
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PLAYER_HIT_COL_RADIUS_MULTIPLIER float64 = 0.01
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PLAYER_GRAZE_COL_RADIUS_MULTIPLIER float64 = 0.04
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PLAYER_DEATH_TIMER_MAX int = 180
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GRAZE_ADDITION_MULTIPLIER int = 1000
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)
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// Interface for registering match handlers
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type Match struct{}
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type PlayerStageState struct {
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hitCol ffi.Circle
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grazeCol ffi.Circle
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bullets []ffi.Bullet
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updatePlayerPos bool
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health int
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graze int
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score int
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deathTimer int
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}
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type PlayerUpdate struct {
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X float64 `json:"x"`
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Y float64 `json:"y"`
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}
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type GameTickUpdate struct {
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Tick int64 `json:"tick"`
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PlayerHitPos map[string]interface{} `json:"playerHitPos"`
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PlayerGrazePos map[string]interface{} `json:"playerGrazePos"`
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NewBullets []map[string]interface{} `json:"newBullets"`
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ForcePlayerPos bool `json:"forcePlayerPos"`
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DeathTimer int `json:"deathTimer"`
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Graze int `json:"graze"`
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}
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type PresenceState struct { // present time! hahahahahahahah!
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presence runtime.Presence
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stageState PlayerStageState
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}
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type BattleRoyaleMatchState struct {
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tickRate int
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currentMatchPhase int
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presences map[string]*PresenceState
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emptyTicks int
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}
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// Run on match start, initializes game state and sets tick rate
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func (m *Match) MatchInit(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, params map[string]interface{}) (interface{}, int, string) {
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tickRate := 60 // MatchLoop invocations per second
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state := &BattleRoyaleMatchState{
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tickRate: tickRate,
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presences: map[string]*PresenceState{},
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emptyTicks: 0,
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currentMatchPhase: MATCH_LOADING,
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}
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label := ""
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return state, tickRate, label
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}
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// Run when a user attempts to join or rejoin a match. Responsible for deciding whether or not to let them in.
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func (m *Match) MatchJoinAttempt(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, dispatcher runtime.MatchDispatcher, tick int64, state interface{}, presence runtime.Presence, metadata map[string]string) (interface{}, bool, string) {
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lobbyState, ok := state.(*BattleRoyaleMatchState)
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if !ok {
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logger.Error("State is not a valid lobby state object for MatchJoin.")
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return nil, false, "Failed to join match: match does not exist."
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}
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accepted := true
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rejectedMessage := ""
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return lobbyState, accepted, rejectedMessage
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}
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// Run when a user successfully joins a match, registers their presence in the game state
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func (m *Match) MatchJoin(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, dispatcher runtime.MatchDispatcher, tick int64, state interface{}, presences []runtime.Presence) interface{} {
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lobbyState, ok := state.(*BattleRoyaleMatchState)
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if !ok {
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logger.Error("State is not a valid lobby state object for MatchJoin.")
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return nil
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}
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for i := 0; i < len(presences); i++ {
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lobbyState.presences[presences[i].GetSessionId()] = &PresenceState{
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presence: presences[i],
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stageState: PlayerStageState{
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hitCol: ffi.NewCircle(STAGE_WIDTH*0.5, STAGE_HEIGHT-STAGE_HEIGHT*0.1, STAGE_WIDTH*PLAYER_HIT_COL_RADIUS_MULTIPLIER),
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grazeCol: ffi.NewCircle(STAGE_WIDTH*0.5, STAGE_HEIGHT-STAGE_HEIGHT*0.1, STAGE_WIDTH*PLAYER_GRAZE_COL_RADIUS_MULTIPLIER),
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bullets: []ffi.Bullet{},
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updatePlayerPos: true,
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health: 3,
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deathTimer: -1,
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},
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}
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}
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return lobbyState
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}
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// Run when a user successfully leaves a match, de-registers their presence in the game state
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func (m *Match) MatchLeave(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, dispatcher runtime.MatchDispatcher, tick int64, state interface{}, presences []runtime.Presence) interface{} {
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lobbyState, ok := state.(*BattleRoyaleMatchState)
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if !ok {
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logger.Error("State is not a valid lobby state object for MatchLeave.")
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return nil
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}
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for i := 0; i < len(presences); i++ {
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sessionID := presences[i].GetSessionId()
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playerState, exists := lobbyState.presences[sessionID]
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if exists {
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for _, bullet := range playerState.stageState.bullets {
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ffi.DestroyBullet(bullet)
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}
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ffi.DestroyCircle(playerState.stageState.hitCol)
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ffi.DestroyCircle(playerState.stageState.grazeCol)
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delete(lobbyState.presences, sessionID)
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}
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}
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return lobbyState
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}
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// Run when a match gets an arbitrary signal from the Nakama runtime (probably from the matchmaker/match lister APIs)
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func (m *Match) MatchSignal(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, dispatcher runtime.MatchDispatcher, tick int64, state interface{}, data string) (interface{}, string) {
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lobbyState, ok := state.(*BattleRoyaleMatchState)
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if !ok {
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logger.Error("State is not a valid lobby state object for MatchSignal.")
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return nil, "Failed to get valid state for return signal"
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}
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returnMessage := ""
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return lobbyState, returnMessage
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}
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// Run when the server enters the graceful shutdown flow. Gives the match a chance to shutdown cleanly within graceSeconds.
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func (m *Match) MatchTerminate(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, dispatcher runtime.MatchDispatcher, tick int64, state interface{}, graceSeconds int) interface{} {
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lobbyState, ok := state.(*BattleRoyaleMatchState)
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if !ok {
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logger.Error("State is not a valid lobby state object for MatchTerminate.")
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return nil
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}
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return lobbyState
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}
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// Main game loop, executed at tickRate per second specified in MatchInit
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func (m *Match) MatchLoop(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, dispatcher runtime.MatchDispatcher, tick int64, state interface{}, messages []runtime.MatchData) interface{} {
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lobbyState, ok := state.(*BattleRoyaleMatchState)
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if !ok {
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logger.Error("State is not a valid lobby state object for MatchLoop.")
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return nil
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}
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// If we have no presences in the match according to the match state, increment the empty ticks count
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if len(lobbyState.presences) == 0 {
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lobbyState.emptyTicks++
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}
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// If the match has been empty for more than 100 ticks, end the match by returning nil
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if lobbyState.emptyTicks > 100 {
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return nil
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}
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// Respond to player input
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for _, msg := range messages {
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// Validate player existence
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_, exists := lobbyState.presences[msg.GetSessionId()]
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if !exists {
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logger.Warn("Received input for non-existent player session ID: %v", msg.GetSessionId())
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continue
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}
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// Parse player message
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var update PlayerUpdate
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if err := json.Unmarshal(msg.GetData(), &update); err != nil {
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logger.Warn("Failed to parse input: %v", err)
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continue
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}
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// Player movement bounds detection
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clampedX := update.X < 0 || update.X > STAGE_WIDTH
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clampedY := update.Y < 0 || update.Y > STAGE_HEIGHT
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update.X = math.Max(0, math.Min(update.X, STAGE_WIDTH))
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update.Y = math.Max(0, math.Min(update.Y, STAGE_HEIGHT))
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lobbyState.presences[msg.GetSessionId()].stageState.hitCol.UpdatePos(update.X, update.Y)
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lobbyState.presences[msg.GetSessionId()].stageState.grazeCol.UpdatePos(update.X, update.Y)
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if clampedX || clampedY {
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lobbyState.presences[msg.GetSessionId()].stageState.updatePlayerPos = true
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}
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}
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// Compute and broadcast per-presence state
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for _, v := range lobbyState.presences {
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// Clean up bullets when they pass off the board
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v.stageState.bullets = slices.DeleteFunc(v.stageState.bullets, func(b ffi.Bullet) bool {
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if b.BeyondKillBoundary(tick) {
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ffi.DestroyBullet(b)
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return true
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}
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return false
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})
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// If the player is dead. Decrement the death timer
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if v.stageState.deathTimer >= 0 {
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v.stageState.deathTimer -= 1
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}
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if v.stageState.deathTimer == 0 { // If the player's death timer has run out, reset them. 0 is a special deathTimer tick that indicates reset to the clients.
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v.stageState.hitCol.UpdatePos(STAGE_WIDTH*0.5, STAGE_HEIGHT-STAGE_HEIGHT*0.1)
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v.stageState.grazeCol.UpdatePos(STAGE_WIDTH*0.5, STAGE_HEIGHT-STAGE_HEIGHT*0.1)
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v.stageState.updatePlayerPos = true
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} else if v.stageState.deathTimer == -1 { // If the player is alive, check if the player collided with a bullet and kill them if so
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if slices.ContainsFunc(v.stageState.bullets, func(b ffi.Bullet) bool {
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return b.CollidesWith(v.stageState.hitCol, tick)
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}) {
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v.stageState.deathTimer = PLAYER_DEATH_TIMER_MAX
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} else if slices.ContainsFunc(v.stageState.bullets, func(b ffi.Bullet) bool { // Otherwise, check the graze col and increment the graze and score
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return b.CollidesWith(v.stageState.grazeCol, tick)
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}) {
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v.stageState.graze += GRAZE_ADDITION_MULTIPLIER
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}
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}
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var newBulletsToBroadcast = []map[string]interface{}{}
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if tick%30 == 0 && v.stageState.deathTimer == -1 {
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numBullets := 20
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spreadAngle := 60.0 // Spread in degrees
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startAngle := 90 - (spreadAngle / 2)
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bulletSpeed := STAGE_WIDTH / float64(lobbyState.tickRate) / 3
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bulletRadiusMult := 0.03
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// Define a single spawn point near the top of the screen
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spawnX := STAGE_WIDTH / 2 // Centered horizontally
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spawnY := STAGE_HEIGHT * 0.1 // 10% from the top
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for i := 0; i < numBullets; i++ {
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angle := startAngle + (spreadAngle/float64(numBullets-1))*float64(i)
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angleRad := angle * (math.Pi / 180.0)
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velx := bulletSpeed * math.Cos(angleRad)
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vely := bulletSpeed * math.Sin(angleRad)
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bullet := ffi.NewLinearBullet(
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tick,
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spawnX,
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spawnY,
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bulletRadiusMult*STAGE_WIDTH,
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velx,
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vely,
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)
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v.stageState.bullets = append(v.stageState.bullets, bullet)
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x, y := bullet.GetPos(tick)
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bulletData := map[string]interface{}{
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"class": BULLET_LINEAR,
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"tick": tick,
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"x": x,
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"y": y,
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"radius_multiplier": bulletRadiusMult,
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"vel_x": velx,
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"vel_y": vely,
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}
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newBulletsToBroadcast = append(newBulletsToBroadcast, bulletData)
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}
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}
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hitPosX, hitPosY := v.stageState.hitCol.GetPos()
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grazePosX, grazePosY := v.stageState.hitCol.GetPos()
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var tickData = GameTickUpdate{
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Tick: tick,
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PlayerHitPos: map[string]interface{}{
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"x": hitPosX,
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"y": hitPosY,
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"radius_multiplier": PLAYER_HIT_COL_RADIUS_MULTIPLIER,
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},
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PlayerGrazePos: map[string]interface{}{
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"x": grazePosX,
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"y": grazePosY,
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"radius_multiplier": PLAYER_GRAZE_COL_RADIUS_MULTIPLIER,
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},
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NewBullets: newBulletsToBroadcast,
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ForcePlayerPos: v.stageState.updatePlayerPos,
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DeathTimer: v.stageState.deathTimer,
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Graze: v.stageState.graze,
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}
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v.stageState.updatePlayerPos = false
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data, err := json.Marshal(tickData)
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if err != nil {
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logger.Error("Error marshalling bullet data", err)
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} else {
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reliable := true
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dispatcher.BroadcastMessage(STATE_UPDATE, data, nil, nil, reliable)
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}
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}
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return lobbyState
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}
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