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Merge branch 'sam/fix-health-buffs' into 'master'

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Fix interaction of max health and max health over time buffs causing infinite health scaling.

See merge request veloren/veloren!2557
This commit is contained in:
Samuel Keiffer 2021-07-05 03:46:45 +00:00
commit 1020fbe86a
2 changed files with 53 additions and 20 deletions
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4
common/src/comp/buff.rs
View File

@ -152,9 +152,9 @@ pub enum BuffEffect {
/// Gradually changes an entities max health over time
MaxHealthChangeOverTime {
rate: f32,
accumulated: f32,
kind: ModifierKind,
target_fraction: f32,
achieved_fraction: Option<f32>,
},
/// Modifies move speed of target
MovementSpeed(f32),
@ -247,9 +247,9 @@ impl Buff {
vec![
BuffEffect::MaxHealthChangeOverTime {
rate: -10.0,
accumulated: 0.0,
kind: ModifierKind::Additive,
target_fraction: 1.0 - data.strength,
achieved_fraction: None,
},
BuffEffect::HealthChangeOverTime {
rate: -10.0,

69
common/systems/src/buff.rs
View File

@ -226,7 +226,8 @@ impl<'a> System<'a> for Sys {
},
BuffEffect::MaxHealthModifier { value, kind } => match kind {
ModifierKind::Additive => {
stat.max_health_modifier += *value / (health.base_max() as f32);
stat.max_health_modifier *=
1.0 + *value / (health.base_max() as f32);
},
ModifierKind::Fractional => {
stat.max_health_modifier *= *value;
@ -245,31 +246,63 @@ impl<'a> System<'a> for Sys {
},
BuffEffect::MaxHealthChangeOverTime {
rate,
accumulated,
kind,
target_fraction,
achieved_fraction,
} => {
*accumulated += *rate * dt;
let current_fraction = health.maximum() as f32
/ (health.base_max() as f32 * stat.max_health_modifier);
let progress = (1.0 - current_fraction) / (1.0 - *target_fraction);
if progress > 1.0 {
stat.max_health_modifier *= *target_fraction;
} else if accumulated.abs() > rate.abs() {
match kind {
// Current fraction uses information from last tick, which is
// necessary as buffs from this tick are not guaranteed to have
// finished applying
let current_fraction =
health.maximum() as f32 / health.base_max() as f32;
// If achieved_fraction not initialized, initialize it to health
// fraction
if achieved_fraction.is_none() {
*achieved_fraction = Some(current_fraction)
}
if let Some(achieved_fraction) = achieved_fraction {
// Percentage change that should be applied to max_health
let health_tick = match kind {
ModifierKind::Additive => {
stat.max_health_modifier = stat.max_health_modifier
* current_fraction
+ *accumulated / health.maximum() as f32;
// `rate * dt` is amount of health, dividing by base max
// creates fraction
*rate * dt / health.base_max() as f32
},
ModifierKind::Fractional => {
stat.max_health_modifier *=
current_fraction * (1.0 - *accumulated);
// `rate * dt` is the fraction
*rate * dt
},
};
let potential_fraction = *achieved_fraction + health_tick;
// Potential progress towards target fraction, if
// target_fraction ~ 1.0 then set progress to 1.0 to avoid
// divide by zero
let progress = if (1.0 - *target_fraction).abs() > f32::EPSILON
{
(1.0 - potential_fraction) / (1.0 - *target_fraction)
} else {
1.0
};
// Change achieved_fraction depending on what other buffs have
// occurred
if progress > 1.0 {
// If potential fraction already beyond target fraction,
// simply multiply max_health_modifier by the target
// fraction, and set achieved fraction to target_fraction
*achieved_fraction = *target_fraction;
} else {
// Else have not achieved target yet, update
// achieved_fraction
*achieved_fraction = potential_fraction;
}
*accumulated = 0.0;
} else {
stat.max_health_modifier *= current_fraction;
// Apply achieved_fraction to max_health_modifier
stat.max_health_modifier *= *achieved_fraction;
}
},
BuffEffect::MovementSpeed(speed) => {