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Factor strategies into helper object instead of requiring methods on types

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Tangent Wantwight 2020-02-15 13:54:59 -05:00
parent 2e0b0c4ff4
commit 4c337f3579
1 changed files with 13 additions and 9 deletions
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22
src/Ecs/Lockstep.ts
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@ -29,9 +29,13 @@ export const enum TickType {
PREDICTED,
}
export type Advancer<Input, State> = (state: State, input: Input) => void;
interface LockstepProcessor<Input, State> {
compareInput(a: Input, b: Input): boolean;
cloneState(source: State): State;
advanceState(state: State, input: Input): void;
}
export class LockstepState<Input extends Equals, State extends DeepCopy<State>> {
export class LockstepState<Input, State> {
private inputIndex = -1;
private inputLog: Input[] = [];
@ -40,21 +44,21 @@ export class LockstepState<Input extends Equals, State extends DeepCopy<State>>
private renderIndex = -1;
private renderState: State;
constructor(private initialState: State, private advancer: Advancer<Input, State>) {
this.canonState = initialState.deepCopy({});
this.renderState = initialState.deepCopy({});
constructor(private initialState: State, private engine: LockstepProcessor<Input, State>) {
this.canonState = engine.cloneState(initialState);
this.renderState = engine.cloneState(initialState);
}
public addCanonInput(input: Input): void {
this.canonIndex++;
// advance canonical game state
this.advancer(this.canonState, input);
this.engine.advanceState(this.canonState, input);
if(this.canonIndex <= this.renderIndex) {
// we're rendering predicted states, so if the input changes we need to invalidate the rendered state
if(!equals(this.inputLog[this.canonIndex], input)) {
this.renderState = this.canonState.deepCopy({});
if(!this.engine.compareInput(this.inputLog[this.canonIndex], input)) {
this.renderState = this.engine.cloneState(this.canonState);
this.renderIndex = this.canonIndex;
}
}
@ -81,7 +85,7 @@ export class LockstepState<Input extends Equals, State extends DeepCopy<State>>
while(this.renderIndex < targetIndex) {
this.renderIndex++;
this.advancer(this.renderState, this.inputLog[this.renderIndex]);
this.engine.advanceState(this.renderState, this.inputLog[this.renderIndex]);
}
return this.renderState;