/**
 * GBA Save State — Snapshot Types
 *
 * Plain objects with typed arrays for IndexedDB structured clone compatibility.
 * Callbacks and references are NOT serialized — they are reconstructed after restore.
 */
import type { CpuSnapshot } from '@gba-kit/arm-emulator/cpu-snapshot';
export type { CpuSnapshot } from '@gba-kit/arm-emulator/cpu-snapshot';
export interface GbaSnapshot {
    version: 1;
    cpu: CpuSnapshot;
    currentScanline: number;
    /** Hardware frames completed since reset. Older snapshots omit it and restore as 0. */
    frameCount?: number;
    inIrqHandler: boolean;
    scheduler: SchedulerSnapshot;
    interrupts: InterruptSnapshot;
    timers: TimerSnapshot;
    dma: DmaSnapshot;
    input: InputSnapshot;
    bus: SystemBusSnapshot;
    ppu: PpuSnapshot;
    apu?: ApuSnapshot;
}
export interface SchedulerEventSnapshot {
    fireCycle: number;
    active: boolean;
}
export interface SchedulerSnapshot {
    currentCycle: number;
    events: SchedulerEventSnapshot[];
}
export interface InterruptSnapshot {
    ime: number;
    ie: number;
    if_: number;
    halted: boolean;
    intrWaitFlags: number;
}
export interface TimerChannelSnapshot {
    counter: number;
    reload: number;
    prescaler: number;
    cascade: boolean;
    irqEnable: boolean;
    enabled: boolean;
    lastUpdateCycle: number;
}
export interface TimerSnapshot {
    channels: TimerChannelSnapshot[];
}
export interface DmaChannelSnapshot {
    srcAddr: number;
    dstAddr: number;
    srcLatch: number;
    dstLatch: number;
    wordCount: number;
    wordCountLatch: number;
    dstControl: number;
    srcControl: number;
    repeat: boolean;
    wordSize: boolean;
    startTiming: number;
    irqEnable: boolean;
    enabled: boolean;
}
export interface DmaSnapshot {
    channels: DmaChannelSnapshot[];
}
export interface InputSnapshot {
    buttons: number;
    keycnt: number;
}
export interface EepromSnapshot {
    data: Uint8Array;
    addrBits: number;
    /** How long the `.sav` installed in the chip was. Older snapshots omit it and restore as 0. */
    installedBytes?: number;
    state: number;
    command: number;
    address: number;
    bitBuffer: string;
    bitsReceived: number;
    sendBuffer: string;
    sendPos: number;
}
export interface SystemBusSnapshot {
    ewram: Uint8Array;
    iwram: Uint8Array;
    palette: Uint8Array;
    vram: Uint8Array;
    oam: Uint8Array;
    sram: Uint8Array;
    mmioRegisters: Uint8Array;
    /** Whether the 0x0E window is backed. The cartridge answers for it, so `deserialize` passes over this; it stays in the snapshot for readers that take it from there. */
    hasSram: boolean;
    waitcnt: number;
    postflg: number;
    lastBiosRead: number;
    eeprom: EepromSnapshot;
}
export interface PpuSnapshot {
    framebuffer: Uint32Array;
    bg2RefX: number;
    bg2RefY: number;
    bg3RefX: number;
    bg3RefY: number;
    bg2RefLatched: boolean;
    bg3RefLatched: boolean;
}
export interface DirectSoundSnapshot {
    buffer: Int8Array;
    readIndex: number;
    writeIndex: number;
    size: number;
    currentSample: number;
    enableLeft: boolean;
    enableRight: boolean;
    fullVolume: boolean;
    timerSelect: number;
}
export interface PsgChannel1Snapshot {
    sweepPeriod: number;
    sweepNegate: boolean;
    sweepShift: number;
    sweepTimer: number;
    sweepEnabled: boolean;
    sweepShadowFreq: number;
    duty: number;
    lengthCounter: number;
    lengthEnabled: boolean;
    envelopeInitialVolume: number;
    envelopeDirection: number;
    envelopePeriod: number;
    envelopeTimer: number;
    volume: number;
    frequency: number;
    frequencyTimer: number;
    dutyPosition: number;
    enabled: boolean;
    dacEnabled: boolean;
}
export interface PsgChannel2Snapshot {
    duty: number;
    lengthCounter: number;
    lengthEnabled: boolean;
    envelopeInitialVolume: number;
    envelopeDirection: number;
    envelopePeriod: number;
    envelopeTimer: number;
    volume: number;
    frequency: number;
    frequencyTimer: number;
    dutyPosition: number;
    enabled: boolean;
    dacEnabled: boolean;
}
export interface PsgChannel3Snapshot {
    waveRam: Uint8Array;
    enabled: boolean;
    dacEnabled: boolean;
    lengthCounter: number;
    lengthEnabled: boolean;
    volumeCode: number;
    frequency: number;
    frequencyTimer: number;
    sampleIndex: number;
    bankMode: boolean;
    bankSelect: number;
}
export interface PsgChannel4Snapshot {
    lengthCounter: number;
    lengthEnabled: boolean;
    envelopeInitialVolume: number;
    envelopeDirection: number;
    envelopePeriod: number;
    envelopeTimer: number;
    volume: number;
    clockShift: number;
    widthMode: boolean;
    divisorCode: number;
    lfsr: number;
    frequencyTimer: number;
    enabled: boolean;
    dacEnabled: boolean;
}
export interface ApuSnapshot {
    ch1: PsgChannel1Snapshot;
    ch2: PsgChannel2Snapshot;
    ch3: PsgChannel3Snapshot;
    ch4: PsgChannel4Snapshot;
    dsA: DirectSoundSnapshot;
    dsB: DirectSoundSnapshot;
    frameSequencerTimer: number;
    frameSequencerStep: number;
    sampleTimer: number;
    psgVolumeRight: number;
    psgVolumeLeft: number;
    psgEnableRight: number;
    psgEnableLeft: number;
    psgMasterVolume: number;
    masterEnable: boolean;
    biasLevel: number;
    biasResolution: number;
}
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