UE学习日志#8 GAS--ASC源码简要分析6 GameplayEffects: Primary outward facing API for other systems P2

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已于 2025-01-22 22:06:05 修改 · 1.1k 阅读

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#学习 #游戏引擎

于 2025-01-22 19:31:41 首次发布

注：1.这个分类是按照源码里的注释分类的

2.本篇是通读并给出一些注释形式的，并不涉及结构性的分析

3.看之前要对UE的GAS系统的定义有初步了解

4.因为都是接口函数，有些没细看的研究那一部分的时候会细看

8 OnPredictiveGameplayCueCatchup

Call预测性添加的GC，移除标签并尝试InvokeGC事件ByTag

/** Called for predictively added gameplay cue. Needs to remove tag count and possible invoke OnRemove event if misprediction */
	virtual void OnPredictiveGameplayCueCatchup(FGameplayTag Tag);

实现：

void UAbilitySystemComponent::OnPredictiveGameplayCueCatchup(FGameplayTag Tag)
{
	// Remove it
	RemoveLooseGameplayTag(Tag);

	if (HasMatchingGameplayTag(Tag) == 0)
	{
		// Invoke Removed event if we no longer have this tag (probably a mispredict)
		InvokeGameplayCueEvent(Tag, EGameplayCueEvent::Removed);
	}
}

9 GetGameplayEffectDuration

声明：

输入Handle，返回

/** Returns the total duration of a gameplay effect */
	float GetGameplayEffectDuration(FActiveGameplayEffectHandle Handle) const;

实现：

调用FActiveGameplayEffectsContainer类型的GetGameplayEffectStartTimeAndDuration

float UAbilitySystemComponent::GetGameplayEffectDuration(FActiveGameplayEffectHandle Handle) const
{
	float StartEffectTime = 0.0f;
	float Duration = 0.0f;
	ActiveGameplayEffects.GetGameplayEffectStartTimeAndDuration(Handle, StartEffectTime, Duration);

	return Duration;
}

到了GetGameplayEffectStartTimeAndDuration中匹配Handle，然后调用下边这个获取

EffectStartTime = ActiveEffect.StartWorldTime;
EffectDuration = ActiveEffect.GetDuration();

10 RecomputeGameplayEffectStartTimes

通过游戏状态同步服务器时间的时候调用，来保持冷却时间与服务器的同步

/** Called whenever the server time replicates via the game state to keep our cooldown timers in sync with the server */
	virtual void RecomputeGameplayEffectStartTimes(const float WorldTime, const float ServerWorldTime);

调用FActiveGameplayEffectsContainer类型的Recomput