126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package pixelflut
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import (
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"fmt"
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"image"
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"image/color"
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"sync"
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"time"
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"github.com/SpeckiJ/Hochwasser/render"
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)
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// FlutTask contains all data that is needed to flut
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type FlutTask struct {
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FlutTaskOpts
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Img FlutTaskData
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}
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// FlutTaskOpts specifies parameters of the flut
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type FlutTaskOpts struct {
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Address string
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MaxConns int
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Offset image.Point
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Paused bool
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RGBSplit bool // @cleanup: replace with `FX: []Effect`
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RandOffset bool
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RenderOrder RenderOrder
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}
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// FlutTaskData contains the actual pixeldata to flut, separated because of size
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type FlutTaskData = *image.NRGBA
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func (t FlutTask) String() string {
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img := "nil"
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if t.Img != nil {
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img = t.Img.Bounds().Size().String()
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}
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return fmt.Sprintf(
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" %d conns @ %s\n img %v offset %v\n order %s rgbsplit %v randoffset %v paused %v",
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t.MaxConns, t.Address, img, t.Offset, t.RenderOrder, t.RGBSplit, t.RandOffset, t.Paused,
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)
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}
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// IsFlutable indicates if a task is properly initialized & not paused
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func (t FlutTask) IsFlutable() bool {
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return t.Img != nil && t.MaxConns > 0 && t.Address != "" && !t.Paused
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}
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type RenderOrder uint8
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func (t RenderOrder) String() string { return []string{"→", "↓", "←", "↑", "random"}[t] }
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func (t RenderOrder) IsVertical() bool { return t&0b01 != 0 }
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func (t RenderOrder) IsReverse() bool { return t&0b10 != 0 }
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func NewOrder(v string) RenderOrder {
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switch v {
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case "ltr", "l", "→":
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return LeftToRight
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case "rtl", "r", "←":
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return RightToLeft
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case "ttb", "t", "↓":
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return TopToBottom
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case "btt", "b", "↑":
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return BottomToTop
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default:
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return Shuffle
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}
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}
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const (
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LeftToRight = 0b000
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TopToBottom = 0b001
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RightToLeft = 0b010
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BottomToTop = 0b011
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Shuffle = 0b100
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)
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// Flut asynchronously executes the given FlutTask, until `stop` is closed.
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func Flut(t FlutTask, stop chan bool, wg *sync.WaitGroup) {
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if !t.IsFlutable() {
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return // @robustness: actually return an error here?
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}
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cmds := generateCommands(t)
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var messages [][]byte
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var maxOffsetX, maxOffsetY int
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if t.RandOffset {
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maxX, maxY := CanvasSize(t.Address)
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maxOffsetX = maxX - t.Img.Bounds().Canon().Dx()
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maxOffsetY = maxY - t.Img.Bounds().Canon().Dy()
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messages = cmds.Chunk(1) // each connection should send the full img
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} else {
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messages = cmds.Chunk(t.MaxConns)
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}
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bombWg := sync.WaitGroup{}
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for i := 0; i < t.MaxConns; i++ {
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msg := messages[0]
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if len(messages) > i {
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msg = messages[i]
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}
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time.Sleep(50 * time.Millisecond) // avoid crashing the server
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go bombAddress(msg, t.Address, maxOffsetX, maxOffsetY, stop, &bombWg)
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}
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bombWg.Wait()
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if wg != nil {
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wg.Done()
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}
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}
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func generateCommands(t FlutTask) (cmds commands) {
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if t.RGBSplit {
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white := color.NRGBA{0xff, 0xff, 0xff, 0xff}
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imgmod := render.ImgColorFilter(t.Img, white, color.NRGBA{0xff, 0, 0, 0xff})
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cmds = append(cmds, commandsFromImage(imgmod, t.RenderOrder, t.Offset.Add(image.Pt(-10, -10)))...)
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imgmod = render.ImgColorFilter(t.Img, white, color.NRGBA{0, 0xff, 0, 0xff})
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cmds = append(cmds, commandsFromImage(imgmod, t.RenderOrder, t.Offset.Add(image.Pt(10, 0)))...)
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imgmod = render.ImgColorFilter(t.Img, white, color.NRGBA{0, 0, 0xff, 0xff})
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cmds = append(cmds, commandsFromImage(imgmod, t.RenderOrder, t.Offset.Add(image.Pt(-10, 10)))...)
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}
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cmds = append(cmds, commandsFromImage(t.Img, t.RenderOrder, t.Offset)...)
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return
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}
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