84 lines
2.7 KiB
TypeScript
84 lines
2.7 KiB
TypeScript
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import { Platform, EmuState, EmuControlsState, EmuRecorder } from "./baseplatform";
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export class StateRecorderImpl implements EmuRecorder {
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checkpointInterval : number = 60;
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callbackStateChanged : () => void;
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maxCheckpoints : number = 120;
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platform : Platform;
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buffer : EmuState[];
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controls : EmuControlsState[];
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frameCount : number;
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lastSeekFrame : number = -1;
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constructor(platform : Platform) {
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this.reset();
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this.platform = platform;
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}
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reset() {
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this.buffer = [];
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this.controls = [];
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this.frameCount = 0;
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this.lastSeekFrame = -1;
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}
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frameRequested() : boolean {
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// buffer full?
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if (this.buffer.length >= this.maxCheckpoints) {
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return false;
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}
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// record the control state, if available
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if (this.platform.saveControlsState) {
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this.controls.push(this.platform.saveControlsState());
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}
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// pick up where we left off, if we used the seek function
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if (this.lastSeekFrame >= 0) {
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this.frameCount = this.lastSeekFrame;
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this.lastSeekFrame = -1;
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// truncate buffers
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this.buffer = this.buffer.slice(0, Math.floor((this.frameCount + this.checkpointInterval - 1) / this.checkpointInterval));
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this.controls = this.controls.slice(0, this.frameCount);
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}
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// time to save next frame?
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this.frameCount++;
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if (this.callbackStateChanged) {
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this.callbackStateChanged();
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}
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return (this.frameCount % this.checkpointInterval) == 0;
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}
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numFrames() : number {
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return this.frameCount;
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}
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recordFrame(state : EmuState) {
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this.buffer.push(state);
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}
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getStateAtOrBefore(frame : number) : {frame : number, state : EmuState} {
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var bufidx = Math.floor(frame / this.checkpointInterval);
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var foundidx = bufidx < this.buffer.length ? bufidx : this.buffer.length-1;
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var foundframe = foundidx * this.checkpointInterval;
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return {frame:foundframe, state:this.buffer[foundidx]};
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}
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loadFrame(seekframe : number) {
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let {frame,state} = this.getStateAtOrBefore(seekframe);
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if (state) {
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this.platform.pause();
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this.platform.loadState(state);
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while (frame < seekframe) {
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if (frame < this.controls.length) {
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this.platform.loadControlsState(this.controls[frame]);
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}
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this.platform.advance(true); // TODO: infinite loop?
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frame++;
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}
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this.platform.advance();
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this.lastSeekFrame = seekframe;
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}
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}
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}
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