330 lines
9.9 KiB
Go
330 lines
9.9 KiB
Go
package uix
|
|
|
|
import (
|
|
"errors"
|
|
"time"
|
|
|
|
"git.kirsle.net/SketchyMaze/doodle/pkg/balance"
|
|
"git.kirsle.net/SketchyMaze/doodle/pkg/collision"
|
|
"git.kirsle.net/SketchyMaze/doodle/pkg/log"
|
|
"git.kirsle.net/SketchyMaze/doodle/pkg/physics"
|
|
"git.kirsle.net/SketchyMaze/doodle/pkg/scripting"
|
|
"git.kirsle.net/go/render"
|
|
"github.com/dop251/goja"
|
|
)
|
|
|
|
// loopActorCollision is the Loop function that checks if pairs of
|
|
// actors are colliding with each other, and handles their scripting
|
|
// responses to such collisions.
|
|
func (w *Canvas) loopActorCollision() error {
|
|
if w.scripting == nil {
|
|
return errors.New("Canvas.loopActorCollision: scripting engine not attached to Canvas")
|
|
}
|
|
|
|
var (
|
|
// Current time of this tick so we can advance animations.
|
|
now = time.Now()
|
|
|
|
// As we iterate over all actors below to process their movement, track
|
|
// their bounding rectangles so we can later see if any pair of actors
|
|
// intersect each other. Also, in case of actor scripts protesting a
|
|
// collision later, store each actor's original position before the move.
|
|
boxes = make([]render.Rect, len(w.actors))
|
|
originalPositions = map[string]render.Point{}
|
|
)
|
|
|
|
// Loop over all the actors in parallel, processing their movement and
|
|
// checking collision data against the level geometry.
|
|
// NOTE: parallelism wasn't good for race conditions like the Thief
|
|
// trying to take your inventory.
|
|
// var wg sync.WaitGroup
|
|
for i, a := range w.actors {
|
|
if a.IsFrozen() {
|
|
continue
|
|
}
|
|
|
|
// wg.Add(1)
|
|
//go
|
|
func(i int, a *Actor) {
|
|
// defer wg.Done()
|
|
originalPositions[a.ID()] = a.Position()
|
|
|
|
// Advance any animations for this actor.
|
|
if a.activeAnimation != nil && a.activeAnimation.nextFrameAt.Before(now) {
|
|
if done := a.TickAnimation(a.activeAnimation); done {
|
|
// Animation has finished, get the callback function.
|
|
callback := a.animationCallback
|
|
|
|
// Clean up the animation state, in case the callback wants
|
|
// to immediately play another animation.
|
|
a.StopAnimation()
|
|
|
|
// Call the callback function.
|
|
if function, ok := goja.AssertFunction(callback); ok {
|
|
function(goja.Undefined())
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
// Get the actor's velocity to see if it's moving this tick.
|
|
v := a.Velocity()
|
|
|
|
// Apply gravity to the actor's velocity.
|
|
if a.hasGravity && !a.Grounded() { //v.Y >= 0 {
|
|
if !a.Grounded() {
|
|
var (
|
|
gravity = balance.GravityMaximum
|
|
acceleration = balance.GravityAcceleration
|
|
)
|
|
if a.IsWet() {
|
|
gravity = balance.SwimGravity
|
|
}
|
|
|
|
// If the actor is jumping/moving upwards, apply softer gravity.
|
|
if v.Y < 0 {
|
|
acceleration = balance.GravityJumpAcceleration
|
|
}
|
|
|
|
v.Y = physics.Lerp(
|
|
v.Y, // current speed
|
|
gravity, // target max gravity falling downwards
|
|
acceleration,
|
|
)
|
|
} else {
|
|
v.Y = 0
|
|
}
|
|
a.SetVelocity(v)
|
|
// v.Y += balance.Gravity
|
|
}
|
|
|
|
// If not moving, grab the bounding box right now.
|
|
if v.IsZero() {
|
|
boxes[i] = collision.GetBoundingRect(a)
|
|
return
|
|
}
|
|
|
|
// Create a delta point from their current location to where they
|
|
// want to move to this tick.
|
|
delta := physics.VectorFromPoint(a.Position())
|
|
delta.Add(v)
|
|
|
|
// Check collision with level geometry.
|
|
chkPoint := delta.ToPoint()
|
|
info, _ := collision.CollidesWithGrid(a, w.chunks, chkPoint)
|
|
|
|
// Inform the caller about the collision state every tick
|
|
if w.OnLevelCollision != nil {
|
|
w.OnLevelCollision(a, info)
|
|
}
|
|
|
|
// Move us back where the collision check put us
|
|
if !a.noclip {
|
|
delta = physics.VectorFromPoint(info.MoveTo)
|
|
}
|
|
|
|
// Move the actor's World Position to the new location.
|
|
a.MoveTo(delta.ToPoint())
|
|
|
|
// Keep the actor from leaving the world borders of bounded maps.
|
|
w.loopContainActorsInsideLevel(a)
|
|
|
|
// Store this actor's bounding box after they've moved.
|
|
boxes[i] = collision.SizePlusHitbox(collision.GetBoundingRect(a), a.Hitbox())
|
|
}(i, a)
|
|
// wg.Wait()
|
|
}
|
|
|
|
var collidingActors = map[*Actor]*Actor{}
|
|
for tuple := range collision.BetweenBoxes(boxes) {
|
|
a, b := w.actors[tuple.A], w.actors[tuple.B]
|
|
|
|
// If neither actor is mobile, don't run collision handlers.
|
|
if !(a.IsMobile() || b.IsMobile()) {
|
|
continue
|
|
}
|
|
|
|
collidingActors[a] = b
|
|
|
|
// log.Error("between boxes: %+v <%s> <%s>", tuple, a.ID(), b.ID())
|
|
|
|
// Call the OnCollide handler for A informing them of B's intersection.
|
|
if w.scripting != nil {
|
|
var (
|
|
rect = collision.SizePlusHitbox(collision.GetBoundingRect(b), b.Hitbox())
|
|
lastGoodBox = render.Rect{
|
|
X: originalPositions[b.ID()].X,
|
|
Y: originalPositions[b.ID()].Y,
|
|
W: boxes[tuple.B].W,
|
|
H: boxes[tuple.B].H,
|
|
}
|
|
)
|
|
|
|
// HACK: below, when we determine the moving actor is "onTop" of
|
|
// the doodad's solid hitbox, we lockY their movement so they don't
|
|
// fall down further; but sometimes there's an off-by-one error if
|
|
// the actor fell a distance before landing, and so the final
|
|
// Settled collision check doesn't fire (i.e. if they fell onto a
|
|
// Crumbly Floor which should begin shaking when walked on).
|
|
//
|
|
// When we decide they're onTop, record the Y position, and then
|
|
// use it for collision-check purposes but DON'T physically move
|
|
// the character by it (moving the character may clip them thru
|
|
// other solid hitboxes like the upside-down trapdoor)
|
|
var onTopY int
|
|
|
|
// Firstly we want to make sure B isn't able to clip through A's
|
|
// solid hitbox if A protests the movement. Trace a vector from
|
|
// B's original position to their current one and ping A's
|
|
// OnCollide handler for each step, with Settled=false. A should
|
|
// only return false if it protests the movement, but not trigger
|
|
// any actions (such as emit messages to linked doodads) until
|
|
// Settled=true.
|
|
if origPoint, ok := originalPositions[b.ID()]; ok {
|
|
// Trace a vector back from the actor's current position
|
|
// to where they originated from. If A protests B's position at
|
|
// ANY time, we mark didProtest=true and continue backscanning
|
|
// B's movement. The next time A does NOT protest, that is to be
|
|
// B's new position.
|
|
|
|
// Special case for when a mobile actor lands ON TOP OF a solid
|
|
// actor. We want to stop their Y movement downwards, but allow
|
|
// horizontal movement on the X axis.
|
|
// Touching the solid actor from the side is already fine.
|
|
var onTop = false
|
|
|
|
var (
|
|
lockX int
|
|
lockY int
|
|
)
|
|
|
|
for point := range render.IterLine(
|
|
origPoint,
|
|
b.Position(),
|
|
) {
|
|
point := point
|
|
test := render.Rect{
|
|
X: point.X,
|
|
Y: point.Y,
|
|
W: rect.W,
|
|
H: rect.H,
|
|
}
|
|
|
|
if info, err := collision.CompareBoxes(boxes[tuple.A], test); err == nil {
|
|
// B is overlapping A's box, call its OnCollide handler
|
|
// with Settled=false and see if it protests the overlap.
|
|
err := w.scripting.To(a.ID()).Events.RunCollide(&CollideEvent{
|
|
Actor: b,
|
|
Overlap: info.Overlap,
|
|
InHitbox: info.Overlap.Intersects(a.Hitbox()),
|
|
Settled: false,
|
|
})
|
|
|
|
// Did A protest?
|
|
if err == scripting.ErrReturnFalse {
|
|
// Are they on top?
|
|
aHitbox := collision.SizePlusHitbox(collision.GetBoundingRect(a), a.Hitbox())
|
|
if render.AbsInt(test.Y+test.H-aHitbox.Y) == 0 {
|
|
// log.Error("ActorCollision: onTop=true at Y=%s", test.Y)
|
|
onTop = true
|
|
onTopY = test.Y
|
|
}
|
|
|
|
// What direction were we moving?
|
|
if test.Y != lastGoodBox.Y {
|
|
if lockY == 0 {
|
|
lockY = lastGoodBox.Y
|
|
}
|
|
if onTop {
|
|
// log.Error("ActorCollision: setGrounded(true)", test.Y)
|
|
b.SetGrounded(true)
|
|
}
|
|
}
|
|
if test.X != lastGoodBox.X {
|
|
if !onTop {
|
|
lockX = lastGoodBox.X
|
|
}
|
|
}
|
|
|
|
// Move them back to the last good box.
|
|
lastGoodBox = test
|
|
if lockX != 0 {
|
|
lastGoodBox.X = lockX
|
|
}
|
|
} else {
|
|
if err != nil {
|
|
log.Error("RunCollide on %s (%s) errored: %s", a.ID(), a.Actor.Filename, err)
|
|
}
|
|
// Move them back to the last good box.
|
|
lastGoodBox = test
|
|
}
|
|
} else {
|
|
// No collision between boxes, increment the lastGoodBox
|
|
lastGoodBox = test
|
|
}
|
|
}
|
|
|
|
// Did we lock their X or Y coordinate from moving further?
|
|
if lockY != 0 {
|
|
lastGoodBox.Y = lockY
|
|
}
|
|
if lockX != 0 {
|
|
lastGoodBox.X = lockX
|
|
}
|
|
|
|
if !b.noclip {
|
|
b.MoveTo(lastGoodBox.Point())
|
|
}
|
|
} else {
|
|
log.Error(
|
|
"ERROR: Actors %s and %s overlap and the script returned false,"+
|
|
"but I didn't store %s original position earlier??",
|
|
a.Doodad().Title, b.Doodad().Title, b.Doodad().Title,
|
|
)
|
|
}
|
|
|
|
if onTopY != 0 && lastGoodBox.Y-onTopY <= 1 {
|
|
lastGoodBox.Y = onTopY
|
|
}
|
|
|
|
// Movement has been settled. Check if B's point is still invading
|
|
// A's box and call its OnCollide handler one last time in
|
|
// Settled=true mode so it can run its actions.
|
|
if info, err := collision.CompareBoxes(boxes[tuple.A], lastGoodBox); err == nil {
|
|
if err := w.scripting.To(a.ID()).Events.RunCollide(&CollideEvent{
|
|
Actor: b,
|
|
Overlap: info.Overlap,
|
|
InHitbox: info.Overlap.Intersects(a.Hitbox()),
|
|
Settled: true,
|
|
}); err != nil && err != scripting.ErrReturnFalse {
|
|
log.Error("VM(%s).RunCollide: %s", a.ID(), err.Error())
|
|
}
|
|
|
|
// If the (player) is pressing the Use key, call the colliding
|
|
// actor's OnUse event.
|
|
if b.flagUsing {
|
|
if err := w.scripting.To(a.ID()).Events.RunUse(&UseEvent{
|
|
Actor: b,
|
|
}); err != nil {
|
|
log.Error("VM(%s).RunUse: %s", a.ID(), err.Error())
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Check for lacks of collisions since last frame.
|
|
for sourceActor, targetActor := range w.collidingActors {
|
|
if _, ok := collidingActors[sourceActor]; !ok {
|
|
w.scripting.To(sourceActor.ID()).Events.RunLeave(&CollideEvent{
|
|
Actor: targetActor,
|
|
Settled: true,
|
|
})
|
|
}
|
|
}
|
|
|
|
// Store this frame's colliding actors for next frame.
|
|
w.collidingActors = collidingActors
|
|
return nil
|
|
}
|