257 lines
7.5 KiB
Go
257 lines
7.5 KiB
Go
package Common
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import (
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"encoding/binary"
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"image/color"
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"time"
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"github.com/hajimehoshi/ebiten"
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)
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// Sprite represents a type of object in D2 that is comprised of one or more frames and directions
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type Sprite struct {
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Directions uint32
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FramesPerDirection uint32
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Frames []*SpriteFrame
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SpecialFrameTime int
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StopOnLastFrame bool
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X, Y int
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Frame, Direction uint8
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Blend bool
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LastFrameTime time.Time
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Animate bool
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ColorMod color.Color
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visible bool
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}
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// SpriteFrame represents a single frame of a sprite
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type SpriteFrame struct {
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Flip uint32
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Width uint32
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Height uint32
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OffsetX int32
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OffsetY int32
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Unknown uint32
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NextBlock uint32
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Length uint32
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ImageData []int16
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Image *ebiten.Image
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Loaded bool
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}
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// CreateSprite creates an instance of a sprite
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func CreateSprite(data []byte, palette PaletteRec) *Sprite {
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result := &Sprite{
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X: 50,
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Y: 50,
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Frame: 0,
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Direction: 0,
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Blend: false,
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ColorMod: nil,
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Directions: binary.LittleEndian.Uint32(data[16:20]),
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FramesPerDirection: binary.LittleEndian.Uint32(data[20:24]),
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Animate: false,
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LastFrameTime: time.Now(),
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SpecialFrameTime: -1,
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StopOnLastFrame: false,
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}
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dataPointer := uint32(24)
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totalFrames := result.Directions * result.FramesPerDirection
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framePointers := make([]uint32, totalFrames)
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for i := uint32(0); i < totalFrames; i++ {
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framePointers[i] = binary.LittleEndian.Uint32(data[dataPointer : dataPointer+4])
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dataPointer += 4
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}
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result.Frames = make([]*SpriteFrame, totalFrames)
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for i := uint32(0); i < totalFrames; i++ {
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dataPointer = framePointers[i]
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result.Frames[i] = &SpriteFrame{Loaded: false}
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result.Frames[i].Flip = binary.LittleEndian.Uint32(data[dataPointer : dataPointer+4])
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dataPointer += 4
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result.Frames[i].Width = binary.LittleEndian.Uint32(data[dataPointer : dataPointer+4])
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dataPointer += 4
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result.Frames[i].Height = binary.LittleEndian.Uint32(data[dataPointer : dataPointer+4])
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dataPointer += 4
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result.Frames[i].OffsetX = BytesToInt32(data[dataPointer : dataPointer+4])
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dataPointer += 4
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result.Frames[i].OffsetY = BytesToInt32(data[dataPointer : dataPointer+4])
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dataPointer += 4
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result.Frames[i].Unknown = binary.LittleEndian.Uint32(data[dataPointer : dataPointer+4])
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dataPointer += 4
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result.Frames[i].NextBlock = binary.LittleEndian.Uint32(data[dataPointer : dataPointer+4])
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dataPointer += 4
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result.Frames[i].Length = binary.LittleEndian.Uint32(data[dataPointer : dataPointer+4])
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dataPointer += 4
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result.Frames[i].ImageData = make([]int16, result.Frames[i].Width*result.Frames[i].Height)
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for fi := range result.Frames[i].ImageData {
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result.Frames[i].ImageData[fi] = -1
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}
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x := uint32(0)
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y := uint32(result.Frames[i].Height - 1)
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go func(ix, dataPointer uint32) {
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for true {
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b := data[dataPointer]
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dataPointer++
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if b == 0x80 {
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if y == 0 {
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break
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}
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y--
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x = 0
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} else if (b & 0x80) > 0 {
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transparentPixels := b & 0x7F
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for ti := byte(0); ti < transparentPixels; ti++ {
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result.Frames[ix].ImageData[x+(y*result.Frames[ix].Width)+uint32(ti)] = -1
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}
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x += uint32(transparentPixels)
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} else {
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for bi := 0; bi < int(b); bi++ {
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result.Frames[ix].ImageData[x+(y*result.Frames[ix].Width)+uint32(bi)] = int16(data[dataPointer])
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dataPointer++
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}
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x += uint32(b)
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}
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}
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result.Frames[ix].Image, _ = ebiten.NewImage(int(result.Frames[ix].Width), int(result.Frames[ix].Height), ebiten.FilterNearest)
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newData := make([]byte, result.Frames[ix].Width*result.Frames[ix].Height*4)
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for ii := uint32(0); ii < result.Frames[ix].Width*result.Frames[ix].Height; ii++ {
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if result.Frames[ix].ImageData[ii] < 1 { // TODO: Is this == -1 or < 1?
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continue
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}
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newData[ii*4] = palette.Colors[result.Frames[ix].ImageData[ii]].R
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newData[(ii*4)+1] = palette.Colors[result.Frames[ix].ImageData[ii]].G
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newData[(ii*4)+2] = palette.Colors[result.Frames[ix].ImageData[ii]].B
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newData[(ii*4)+3] = 0xFF
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}
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result.Frames[ix].Image.ReplacePixels(newData)
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result.Frames[ix].Loaded = true
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}(i, dataPointer)
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}
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return result
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}
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// GetSize returns the size of the sprite
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func (v *Sprite) GetSize() (uint32, uint32) {
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frame := v.Frames[uint32(v.Frame)+(uint32(v.Direction)*v.FramesPerDirection)]
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for frame.Loaded == false {
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time.Sleep(time.Millisecond * 5)
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}
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return frame.Width, frame.Height
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}
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func (v *Sprite) updateAnimation() {
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if !v.Animate {
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return
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}
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var timePerFrame time.Duration
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if v.SpecialFrameTime >= 0 {
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timePerFrame = time.Duration(float64(time.Millisecond) * (float64(v.SpecialFrameTime) / float64(len(v.Frames))))
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} else {
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timePerFrame = time.Duration(float64(time.Second) * (1.0 / float64(len(v.Frames))))
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}
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for time.Now().Sub(v.LastFrameTime) >= timePerFrame {
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v.LastFrameTime = v.LastFrameTime.Add(timePerFrame)
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v.Frame++
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if v.Frame >= uint8(v.FramesPerDirection) {
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if v.StopOnLastFrame {
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v.Frame = uint8(v.FramesPerDirection) - 1
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} else {
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v.Frame = 0
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}
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}
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}
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}
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func (v *Sprite) ResetAnimation() {
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v.LastFrameTime = time.Now()
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v.Frame = 0
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}
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func (v *Sprite) OnLastFrame() bool {
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return v.Frame == uint8(v.FramesPerDirection-1)
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}
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// GetFrameSize returns the size of the specific frame
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func (v *Sprite) GetFrameSize(frame int) (width, height uint32) {
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for v.Frames[frame].Loaded == false {
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time.Sleep(time.Millisecond)
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}
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width = v.Frames[frame].Width
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height = v.Frames[frame].Height
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return
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}
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// GetTotalFrames returns the number of frames in this sprite (for all directions)
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func (v *Sprite) GetTotalFrames() int {
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return len(v.Frames)
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}
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// Draw draws the sprite onto the target
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func (v *Sprite) Draw(target *ebiten.Image) {
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v.updateAnimation()
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opts := &ebiten.DrawImageOptions{}
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frame := v.Frames[uint32(v.Frame)+(uint32(v.Direction)*v.FramesPerDirection)]
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for frame.Loaded == false {
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time.Sleep(time.Millisecond)
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}
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opts.GeoM.Translate(
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float64(int32(v.X)+frame.OffsetX),
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float64((int32(v.Y) - int32(frame.Height) + frame.OffsetY)),
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)
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if v.Blend {
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opts.CompositeMode = ebiten.CompositeModeLighter
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} else {
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opts.CompositeMode = ebiten.CompositeModeSourceOver
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}
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if v.ColorMod != nil {
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opts.ColorM = ColorToColorM(v.ColorMod)
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}
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target.DrawImage(frame.Image, opts)
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}
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// DrawSegments draws the sprite via a grid of segments
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func (v *Sprite) DrawSegments(target *ebiten.Image, xSegments, ySegments, offset int) {
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v.updateAnimation()
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yOffset := int32(0)
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for y := 0; y < ySegments; y++ {
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xOffset := int32(0)
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biggestYOffset := int32(0)
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for x := 0; x < xSegments; x++ {
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frame := v.Frames[uint32(x+(y*xSegments)+(offset*xSegments*ySegments))]
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opts := &ebiten.DrawImageOptions{}
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opts.GeoM.Translate(
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float64(int32(v.X)+frame.OffsetX+xOffset),
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float64(int32(v.Y)+frame.OffsetY+yOffset),
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)
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if v.Blend {
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opts.CompositeMode = ebiten.CompositeModeLighter
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} else {
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opts.CompositeMode = ebiten.CompositeModeSourceOver
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}
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if v.ColorMod != nil {
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opts.ColorM = ColorToColorM(v.ColorMod)
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}
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for frame.Loaded == false {
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time.Sleep(time.Millisecond * 5)
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}
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target.DrawImage(frame.Image, opts)
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xOffset += int32(frame.Width)
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biggestYOffset = MaxInt32(biggestYOffset, int32(frame.Height))
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}
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yOffset += biggestYOffset
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}
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}
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// MoveTo moves the sprite to the specified coordinates
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func (v *Sprite) MoveTo(x, y int) {
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v.X = x
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v.Y = y
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}
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// GetLocation returns the location of the sprite
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func (v *Sprite) GetLocation() (int, int) {
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return v.X, v.Y
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}
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