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animation.go
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animation.go
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package game
import (
"math"
"github.com/mokiat/gomath/dprec"
"github.com/mokiat/lacking/game/hierarchy"
)
type AnimationDefinitionInfo struct {
Name string
StartTime float64
EndTime float64
Bindings []AnimationBindingDefinitionInfo
}
type AnimationBindingDefinitionInfo struct {
NodeIndex int
NodeName string //alternative in case of isolated animation
TranslationKeyframes KeyframeList[dprec.Vec3]
RotationKeyframes KeyframeList[dprec.Quat]
ScaleKeyframes KeyframeList[dprec.Vec3]
}
type AnimationDefinition struct {
name string
startTime float64
endTime float64
bindings []AnimationBindingDefinitionInfo
}
type AnimationInfo struct {
Model *Model
Definition *AnimationDefinition
}
type Animation struct {
name string
definition *AnimationDefinition
bindings []animationBinding
}
func (a *Animation) Name() string {
return a.name
}
func (a *Animation) StartTime() float64 {
return a.definition.startTime
}
func (a *Animation) EndTime() float64 {
return a.definition.endTime
}
func (a *Animation) Length() float64 {
return a.EndTime() - a.StartTime()
}
func (a *Animation) Apply(timestamp float64) {
// FIXME: This does not work for animation blending
for _, binding := range a.bindings {
if binding.node == nil {
continue
}
if len(binding.translationKeyframes) > 0 {
translation := binding.Translation(timestamp)
binding.node.SetPosition(translation)
}
if len(binding.rotationKeyframes) > 0 {
rotation := binding.Rotation(timestamp)
binding.node.SetRotation(rotation)
}
if len(binding.scaleKeyframes) > 0 {
scale := binding.Scale(timestamp)
binding.node.SetScale(scale)
}
}
}
type animationBinding struct {
node *hierarchy.Node
translationKeyframes KeyframeList[dprec.Vec3]
rotationKeyframes KeyframeList[dprec.Quat]
scaleKeyframes KeyframeList[dprec.Vec3]
}
func (b animationBinding) Translation(timestamp float64) dprec.Vec3 {
left, right, t := b.translationKeyframes.Keyframe(timestamp)
return dprec.Vec3Lerp(left.Value, right.Value, t)
}
func (b animationBinding) Rotation(timestamp float64) dprec.Quat {
left, right, t := b.rotationKeyframes.Keyframe(timestamp)
return dprec.QuatSlerp(left.Value, right.Value, t)
}
func (b animationBinding) Scale(timestamp float64) dprec.Vec3 {
left, right, t := b.scaleKeyframes.Keyframe(timestamp)
return dprec.Vec3Lerp(left.Value, right.Value, t)
}
type KeyframeList[T any] []Keyframe[T]
func (l KeyframeList[T]) Keyframe(timestamp float64) (Keyframe[T], Keyframe[T], float64) {
leftIndex := 0
rightIndex := len(l) - 1
for leftIndex < rightIndex-1 {
middleIndex := (leftIndex + rightIndex) / 2
middle := l[middleIndex]
if middle.Timestamp <= timestamp {
leftIndex = middleIndex
}
if middle.Timestamp >= timestamp {
rightIndex = middleIndex
}
}
left := l[leftIndex]
right := l[rightIndex]
if leftIndex == rightIndex {
return left, right, 0
}
t := dprec.Clamp((timestamp-left.Timestamp)/(right.Timestamp-left.Timestamp), 0.0, 1.0)
return left, right, t
}
type Keyframe[T any] struct {
Timestamp float64
Value T
}
type Playback struct {
scene *Scene
animation *Animation
name string
head float64
startTime float64
endTime float64
speed float64
playing bool
loop bool
}
func (p *Playback) Name() string {
return p.name
}
func (p *Playback) SetName(name string) {
p.name = name
}
func (p *Playback) Play() {
p.playing = true
}
func (p *Playback) Pause() {
p.playing = false
}
func (p *Playback) Stop() {
p.Pause()
p.head = p.animation.StartTime()
}
func (p *Playback) Loop() bool {
return p.loop
}
func (p *Playback) SetLoop(loop bool) {
p.loop = loop
}
func (p *Playback) Speed() float64 {
return p.speed
}
func (p *Playback) SetSpeed(speed float64) {
p.speed = speed
}
func (p *Playback) Advance(amount float64) {
p.head += amount * p.speed
if p.head > p.endTime {
if p.loop {
p.head = p.startTime + math.Mod(p.head, p.Length())
} else {
p.head = p.endTime
p.Pause()
}
}
}
func (p *Playback) Seek(head float64) {
p.head = head
}
func (p *Playback) Head() float64 {
return p.head
}
func (p *Playback) StartTime() float64 {
return p.startTime
}
func (p *Playback) SetStartTime(startTime float64) {
p.startTime = startTime
}
func (p *Playback) EndTime() float64 {
return p.endTime
}
func (p *Playback) SetEndTime(endTime float64) {
p.endTime = endTime
}
func (p *Playback) Length() float64 {
return p.endTime - p.startTime
}
func (p *Playback) Delete() {
p.scene.playbacks.Remove(p)
p.scene.playbackPool.Restore(p)
}