Apply some more object animation settings (#549)

* Init torches with random start mode

* Apply more object animation settings

Also add ability to start object animation on random frame

d2core/d2asset/composite.go

@@ -152,12 +152,43 @@ func (c *Composite) GetPlayedCount() int {
 	return c.mode.playedCount
 }
 
+// SetPlayLoop turns on or off animation looping
+func (c *Composite) SetPlayLoop(loop bool) {
+	for layerIdx := range c.mode.layers {
+		layer := c.mode.layers[layerIdx]
+		if layer != nil {
+			layer.SetPlayLoop(loop)
+		}
+	}
+}
+
+// SetSubLoop sets a loop to be between the specified frame indices
+func (c *Composite) SetSubLoop(startFrame, endFrame int) {
+	for layerIdx := range c.mode.layers {
+		layer := c.mode.layers[layerIdx]
+		if layer != nil {
+			layer.SetSubLoop(startFrame, endFrame)
+		}
+	}
+}
+
+// SetCurrentFrame sets the current frame index of the animation
+func (c *Composite) SetCurrentFrame(frame int) {
+	for layerIdx := range c.mode.layers {
+		layer := c.mode.layers[layerIdx]
+		if layer != nil {
+			layer.SetCurrentFrame(frame)
+		}
+	}
+}
+
 func (c *Composite) resetPlayedCount() {
 	if c.mode != nil {
 		c.mode.playedCount = 0
 	}
 }
 
+
 type compositeMode struct {
 	cof           *d2cof.COF
 	animationMode string

d2core/d2object/init_function.go

@@ -1,6 +1,8 @@
 package d2object
 
 import (
+	"math/rand"
+
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 )
 
@@ -10,6 +12,7 @@ func initObject(ob *Object) bool {
 		8:  initTorch,
 		14: initTorch,
 		17: initWaypoint,
+		34: initTorchRnd,
 	}
 
 	fun, ok := funcs[ob.objectRecord.InitFn]
@@ -25,13 +28,24 @@ func initObject(ob *Object) bool {
 // Initializes torch/brazier type objects
 func initTorch(ob *Object) {
 	if ob.objectRecord.HasAnimationMode[d2enum.AnimationModeObjectOperating] {
-		ob.setMode("ON", 0)
+		ob.setMode("ON", 0, true)
 	}
 }
 
 func initWaypoint(ob *Object) {
 	// Turn these on unconditionally for now, they look nice :)
 	if ob.objectRecord.HasAnimationMode[d2enum.AnimationModeObjectOperating] {
-		ob.setMode("ON", 0)
+		ob.setMode("ON", 0, true)
+	}
+}
+
+// Randomly spawns in either NU or OP
+func initTorchRnd(ob *Object) {
+	n := rand.Intn(2)
+
+	if n > 0 {
+		ob.setMode("NU", 0, true)
+	} else {
+		ob.setMode("OP", 0, true)
 	}
 }

d2core/d2object/object.go

@@ -3,6 +3,7 @@ package d2object
 
 import (
 	"math"
+	"math/rand"
 
 	"github.com/OpenDiablo2/OpenDiablo2/d2common"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2data/d2datadict"
@@ -49,7 +50,7 @@ func CreateObject(x, y int, objectRec *d2datadict.ObjectRecord, palettePath stri
 
 	entity.composite = composite
 
-	entity.setMode("NU", 0)
+	entity.setMode("NU", 0, false)
 
 	initObject(entity)
 
@@ -57,7 +58,7 @@ func CreateObject(x, y int, objectRec *d2datadict.ObjectRecord, palettePath stri
 }
 
 // setMode changes the graphical mode of this animated entity
-func (ob *Object) setMode(animationMode string, direction int) error {
+func (ob *Object) setMode(animationMode string, direction int, randomFrame bool) error {
 	err := ob.composite.SetMode(animationMode, "HTH")
 	if err != nil {
 		return err
@@ -74,6 +75,20 @@ func (ob *Object) setMode(animationMode string, direction int) error {
 		ob.composite.SetAnimSpeed(speed)
 	}
 
+	frameCount := ob.objectRecord.FrameCount[mode]
+
+	if frameCount != 0 {
+		ob.composite.SetSubLoop(0, frameCount)
+	}
+
+	ob.composite.SetPlayLoop(ob.objectRecord.CycleAnimation[mode])
+	ob.composite.SetCurrentFrame(ob.objectRecord.StartFrame[mode])
+
+	if randomFrame {
+		n := rand.Intn(frameCount)
+		ob.composite.SetCurrentFrame(n)
+	}
+
 	return err
 }