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// Flux easing used for animations
package ease
import "base:intrinsics"
import "core:time"
Flux_Map :: struct($T: typeid) {
values: map[^T]Flux_Tween(T),
keys_to_be_deleted: [dynamic]^T,
}
Flux_Tween :: struct($T: typeid) {
value: ^T,
start: T,
diff: T,
goal: T,
delay: f64, // in seconds
duration: time.Duration,
progress: f64,
rate: f64,
type: Ease,
inited: bool,
// callbacks, data can be set, will be pushed to callback
data: rawptr, // by default gets set to value input
on_start: proc(flux: ^Flux_Map(T), data: rawptr),
on_update: proc(flux: ^Flux_Map(T), data: rawptr),
on_complete: proc(flux: ^Flux_Map(T), data: rawptr),
}
// init flux map to a float type and a wanted cap
@(require_results)
flux_init :: proc($T: typeid, value_capacity := 8, allocator := context.allocator, loc := #caller_location) -> Flux_Map(T) where intrinsics.type_is_float(T) {
return {
values = make(map[^T]Flux_Tween(T), value_capacity, allocator, loc),
keys_to_be_deleted = make([dynamic]^T, 0, value_capacity, allocator, loc),
}
}
// delete map content
flux_destroy :: proc(flux: Flux_Map($T), allocator := context.allocator, loc := #caller_location) where intrinsics.type_is_float(T) {
delete(flux.values, loc)
delete(flux.keys_to_be_deleted, loc)
}
// clear map content, stops all animations
flux_clear :: proc(flux: ^Flux_Map($T)) where intrinsics.type_is_float(T) {
clear(&flux.values)
}
// append / overwrite existing tween value to parameters
// rest is initialized in flux_tween_init, inside update
// return value can be used to set callbacks
@(require_results)
flux_to :: proc(
flux: ^Flux_Map($T),
value: ^T,
goal: T,
type: Ease = .Quadratic_Out,
duration: time.Duration = time.Second,
delay: f64 = 0,
) -> (tween: ^Flux_Tween(T)) where intrinsics.type_is_float(T) {
if res, ok := &flux.values[value]; ok {
tween = res
} else {
flux.values[value] = {}
tween = &flux.values[value]
}
tween^ = {
value = value,
goal = goal,
duration = duration,
delay = delay,
type = type,
data = value,
}
return
}
// init internal properties
flux_tween_init :: proc(tween: ^Flux_Tween($T), duration: time.Duration) where intrinsics.type_is_float(T) {
tween.inited = true
tween.start = tween.value^
tween.diff = tween.goal - tween.value^
s := time.duration_seconds(duration)
tween.rate = duration > 0 ? 1.0 / s : 0
tween.progress = duration > 0 ? 0 : 1
}
// update all tweens, wait for their delay if one exists
// calls callbacks in all stages, when they're filled
// deletes tween from the map after completion
flux_update :: proc(flux: ^Flux_Map($T), dt: f64) where intrinsics.type_is_float(T) {
clear(&flux.keys_to_be_deleted)
for key, &tween in flux.values {
delay_remainder := f64(0)
// Update delay if necessary.
if tween.delay > 0 {
tween.delay -= dt
if tween.delay < 0 {
// We finished the delay, but in doing so consumed part of this frame's `dt` budget.
// Keep track of it so we can apply it to this tween without affecting others.
delay_remainder = tween.delay
// We're done with this delay.
tween.delay = 0
}
}
// We either had no delay, or the delay has been consumed.
if tween.delay <= 0 {
if !tween.inited {
flux_tween_init(&tween, tween.duration)
if tween.on_start != nil {
tween.on_start(flux, tween.data)
}
}
// If part of the `dt` budget was consumed this frame, then `delay_remainder` will be
// that remainder, a negative value. Adding it to `dt` applies what's left of the `dt`
// to the tween so it advances properly, instead of too much or little.
tween.progress += tween.rate * (dt + delay_remainder)
x := tween.progress >= 1 ? 1 : ease(tween.type, tween.progress)
tween.value^ = tween.start + tween.diff * T(x)
if tween.on_update != nil {
tween.on_update(flux, tween.data)
}
if tween.progress >= 1 {
// append keys to array that will be deleted after the loop
append(&flux.keys_to_be_deleted, key)
if tween.on_complete != nil {
tween.on_complete(flux, tween.data)
}
}
}
}
// loop through keys that should be deleted from the map
if len(flux.keys_to_be_deleted) != 0 {
for key in flux.keys_to_be_deleted {
delete_key(&flux.values, key)
}
}
}
// stop a specific key inside the map
// returns true when it successfully removed the key
@(require_results)
flux_stop :: proc(flux: ^Flux_Map($T), key: ^T) -> bool where intrinsics.type_is_float(T) {
if key in flux.values {
delete_key(&flux.values, key)
return true
}
return false
}
// returns the amount of time left for the tween animation, if the key exists in the map
// returns 0 if the tween doesn't exist on the map
@(require_results)
flux_tween_time_left :: proc(flux: Flux_Map($T), key: ^T) -> f64 {
if tween, ok := flux.values[key]; ok {
return ((1 - tween.progress) * tween.rate) + tween.delay
} else {
return 0
}
}
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