Big refactor

Signed-off-by: Martyn Ranyard <m@rtyn.berlin>

internal/patterns/common.go

@@ -0,0 +1,27 @@
+package patterns
+
+func Even(number int) bool {
+	return number %2 == 0
+}
+
+func FillPanel(w int, h int, r byte, g byte, b byte) [][]RGBcolor {
+	grid := make([][]RGBcolor, w)
+	for i := 0; i < w; i++ {
+		grid[i] = make([]RGBcolor, h)
+	}
+	for x := 0; x < w; x++ {
+		for y := 0; y < h; y++ {
+			var rgb [3]byte
+			rgb[0] = r
+			rgb[1] = g
+			rgb[2] = b
+			grid[x][y] = rgb
+		}
+	}
+	return grid
+}
+
+
+func FillPanelRGB(w int, h int, colour RGBcolor) [][]RGBcolor {
+	return FillPanel(w,h,colour[0],colour[1],colour[2])
+}

internal/patterns/experiment.go

@@ -0,0 +1,49 @@
+package patterns
+
+import "math"
+
+var sineoffset int = 0
+var lastSineSpeed uint16 = 0
+
+func Sinewave(w int, h int, bgColor RGBcolor, fgColor RGBcolor, speed uint16) [][]RGBcolor  {
+	if speed != lastSineSpeed {
+		lastSineSpeed = speed
+		sineoffset = 0
+	}
+    sineoffset += int(speed/40)
+	background := FillPanelRGB(w,h,bgColor)
+	for x := 0; x < w; x++ {
+		y := int(math.Round((math.Sin(float64(x+sineoffset))+1) / 2 * float64(h-1)))
+		background[x][y] = fgColor
+	}
+	return background
+}
+
+var lastSinePos int = 0
+
+func SineChase(w int, h int, bgColor RGBcolor, fgColor RGBcolor, speed uint16) [][]RGBcolor  {
+	if speed != lastSineSpeed {
+		lastSineSpeed = speed
+		lastSinePos = 0
+	}
+	background := FillPanelRGB(w,h,bgColor)
+	y := int(math.Round((math.Sin(float64(lastSinePos))+1) / 2 * float64(h-1)))
+	background[lastSinePos][y] = fgColor
+	lastSinePos += 1
+	if lastSinePos >= w {
+		lastSinePos = 0
+	}
+	return background
+}
+
+func ZigZag(w int, h int) [][]RGBcolor  {
+	var bgColor = [3]byte{0,0,0}
+	var fgColor = [3]byte{255,0,0}
+	//var a = [5]int{2, 4, 6, 8, 10}
+	background := FillPanelRGB(w,h,bgColor)
+	for x := 0; x < w; x++ {
+		y := x % (h-1)
+		background[x][y] = fgColor
+	}
+	return background
+}

internal/patterns/gradient.go

@@ -0,0 +1,16 @@
+package patterns
+
+// gradient returns from fromX to toX fading from (fromR,fromG,fromB) to (toR,toG,toB)
+// at least that's the idea.
+func Gradient(fromR byte, fromG byte, fromB byte, toR byte, toG byte, toB byte, fromX int, toX int) []byte {
+	ret := make([]byte, toX*3)
+	var stepR float32 = (float32(toR) - float32(fromR)) / (float32(toX) - float32(fromX))
+	var stepG float32 = (float32(toG) - float32(fromG)) / (float32(toX) - float32(fromX))
+	var stepB float32 = (float32(toB) - float32(fromB)) / (float32(toX) - float32(fromX))
+	for i := fromX; i < toX*3; i += 3 {
+		ret[i] = fromR + byte(float32(i/3)*stepR)
+		ret[i+1] = fromG + byte(float32(i/3)*stepG)
+		ret[i+2] = fromB + byte(float32(i/3)*stepB)
+	}
+	return ret
+}

internal/patterns/plaincolour.go

@@ -0,0 +1,27 @@
+package patterns
+
+import "math/rand"
+import "time"
+
+func RedPanel(w int, h int) [][]RGBcolor {
+	return FillPanel(w, h, 255, 0, 0)
+}
+
+var lastColour RGBcolor
+var lastIteration uint16 = 0
+
+func RandomColourPanel(w int, h int, speed uint16) [][]RGBcolor {
+	if lastIteration > 0 {
+		lastIteration -= 40
+	}
+	if lastIteration <= 0 {
+		r := rand.New(rand.NewSource(time.Now().UnixNano()))
+		var newColour RGBcolor
+		newColour[0] = byte(r.Intn(255))
+		newColour[1] = byte(r.Intn(255))
+		newColour[2] = byte(r.Intn(255))
+		lastColour = newColour
+		lastIteration = speed
+	}
+	return FillPanel(w, h, lastColour[0], lastColour[1], lastColour[2])
+}

internal/patterns/plasma.go

@@ -0,0 +1,68 @@
+package patterns
+
+import "math"
+
+type RGBcolor = [3]byte
+
+func plasmaRGBFromVal(val byte) (byte, byte, byte) {
+	var r byte
+	var g byte
+	var b byte
+	if val < 85 {
+		r = val * 3
+		g = 255 - r
+		b = 0
+	} else if val < 170 {
+		b = (val - 85) * 3
+		r = 255 - b
+		g = 0
+	} else {
+		g = (val - 170) * 3
+		b = 255 - g
+		r = 0
+	}
+	return r, g, b
+}
+
+
+func LinearPlasma(l int) []byte {
+	line := make([]byte, l*3)
+	for i := 0; i < l*3; i += 3 {
+		val := byte(i % 256)
+		r, g, b := plasmaRGBFromVal(val)
+		line[i] = r
+		line[i+1] = g
+		line[i+2] = b
+	}
+	return line
+}
+
+var offset float64 = 0.5
+
+func PlasmaPanel(w int, h int, speed uint16) [][]RGBcolor {
+	grid := make([][]RGBcolor, w)
+	for i := 0; i < w; i++ {
+		grid[i] = make([]RGBcolor, h)
+	}
+	scale := math.Pi * 2.0 / float64(w)
+	step := float64(5 * speed / 40)
+	offset -= step
+	if offset < 0 {
+		offset += 1.0
+	}
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+			u := math.Cos((float64(x) + offset) * scale)
+			v := math.Cos((float64(y) + offset) * scale)
+			w := math.Cos((float64(w) + offset) * scale)
+			e := (u + v + w + 3.0) / 6.0
+			r, g, b := plasmaRGBFromVal(byte((offset + e) * 255))
+			var rgb [3]byte
+			rgb[0] = r
+			rgb[1] = g
+			rgb[2] = b
+			grid[x][y] = rgb
+		}
+	}
+	return grid
+}

internal/patterns/staticpatterns.go

@@ -0,0 +1,17 @@
+package patterns
+
+func AlternateRGBLinear(R0 byte, G0 byte, B0 byte, R1 byte, G1 byte, B1 byte, fromX int, toX int) []byte {
+	ret := make([]byte, toX*3)
+	for i := fromX; i < toX*3; i += 3 {
+		if Even(i) {
+			ret[i] = R0
+			ret[i+1] = G0
+			ret[i+2] = B0
+		} else {
+			ret[i] = R1
+			ret[i+1] = G1
+			ret[i+2] = B1
+		}
+	}
+	return ret
+}

internal/queue/queue.go

@@ -0,0 +1,7 @@
+package queue
+
+type QueueItem struct {
+	Effect string
+	Duration uint16
+	Speed uint16 //only used by some patterns
+}

internal/remapping/remapping.go

@@ -0,0 +1,88 @@
+package remapping
+
+type RGBcolor = [3]byte
+
+func Even(number int) bool {
+	return number %2 == 0
+}
+
+func Slice512(s []byte) [512]byte {
+	var ret [512]byte
+	for i := range s {
+		if i < 512 {
+			ret[i] = s[i]
+		}
+	}
+	return ret
+}
+
+func SliceUnlenthed(s [512]byte) []byte {
+	ret := make([]byte, 512)
+	for i := range s {
+		ret[i] = s[i]
+	}
+	return ret
+}
+
+func SliceRearrange(rowwidth int, rows int, alternaterows bool, inslice []byte) [][]byte {
+	var flippedslice []byte
+	if alternaterows {
+		flippedslice = make([]byte, len(inslice)+3)
+		for r := 0; r < rows; r++ {
+			rowzero := (r * rowwidth * 3)
+			if Even(r) {
+				for c := 0; c < (rowwidth)*3; c += 3 {
+					flippedslice[rowzero+c] = inslice[rowzero+c]
+					flippedslice[rowzero+c+1] = inslice[rowzero+c+1]
+					flippedslice[rowzero+c+2] = inslice[rowzero+c+2]
+				}
+			} else {
+				x := rowwidth * 3
+				for c := 0; c < (rowwidth)*3; c += 3 {
+					x = x - 3
+					flippedslice[rowzero+x] = inslice[rowzero+c]
+					flippedslice[rowzero+x+1] = inslice[rowzero+c+1]
+					flippedslice[rowzero+x+2] = inslice[rowzero+c+2]
+				}
+			}
+		}
+	} else {
+		flippedslice = inslice
+	}
+	currentUniverse := 0
+	currentUniversePosition := 0
+	universes := make([][]byte, (len(flippedslice)/510)+1)
+	currentUniverseSlice := make([]byte, 511)
+	currentRowReverse := false
+	for i := range flippedslice {
+		if currentUniversePosition >= 510 {
+			universes[currentUniverse] = currentUniverseSlice
+			if !currentRowReverse {
+				currentRowReverse = true
+			} else {
+				currentRowReverse = false
+			}
+			currentUniverse += 1
+			currentUniversePosition = 0
+			currentUniverseSlice = make([]byte, 511)
+		}
+		currentUniverseSlice[currentUniversePosition] = flippedslice[i]
+		currentUniversePosition += 1
+	}
+	universes[currentUniverse] = currentUniverseSlice
+	return universes
+}
+
+func XYGridToLinear(w int, h int, grid [][]RGBcolor) []byte {
+	ret := make([]byte, w*h*3)
+	i := 0
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+			ret[i] = grid[x][y][0]
+			ret[i+1] = grid[x][y][1]
+			ret[i+2] = grid[x][y][2]
+			i += 3
+		}
+	}
+	return ret
+}

internal/webserver/webserver.go

@@ -0,0 +1,70 @@
+package webserver
+
+import (
+
+	"github.com/gorilla/handlers"
+	"github.com/gorilla/mux"
+	queue "git.martyn.berlin/martyn/LEDController/internal/queue"
+
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+	"strconv"
+)
+
+func HealthHandler(response http.ResponseWriter, request *http.Request) {
+	response.Header().Add("Content-type", "text/plain")
+	fmt.Fprint(response, "I'm okay jack!")
+}
+
+func NotFoundHandler(response http.ResponseWriter, request *http.Request) {
+	response.WriteHeader(404)
+	fmt.Fprint(response, "I'm lost!")
+}
+
+func RootHandler(response http.ResponseWriter, request *http.Request) {
+	response.Header().Add("Content-type", "text/plain")
+	fmt.Fprint(response, "Not implemented")
+}
+
+var globalQueue chan queue.QueueItem;
+
+func PatternHandler(response http.ResponseWriter, request *http.Request) {
+	vars := mux.Vars(request)
+	response.Header().Add("Content-type", "text/plain")
+	var e queue.QueueItem
+	e.Effect = vars["pattern"]
+	i, _ := strconv.Atoi(vars["duration"])
+	e.Duration = uint16(i)
+	_, found := vars["speed"]
+	if found {
+		i, _ := strconv.Atoi(vars["speed"])
+		e.Speed = uint16(i)
+		fmt.Printf("Speed passed %d\n",e.Speed)
+	} else {
+		e.Speed = 40
+	}
+	globalQueue <- e
+	fmt.Fprint(response, "OKAY")
+}
+
+func HandleHTTP(queueChannel chan queue.QueueItem) {
+	globalQueue = queueChannel
+	r := mux.NewRouter()
+	loggedRouter := handlers.LoggingHandler(os.Stdout, r)
+	r.NotFoundHandler = http.HandlerFunc(NotFoundHandler)
+	r.HandleFunc("/", RootHandler)
+	r.HandleFunc("/healthz", HealthHandler)
+	r.HandleFunc("/pattern/{pattern}/{duration}", PatternHandler)
+	r.HandleFunc("/pattern/{pattern}/{duration}/{speed}", PatternHandler)
+	http.Handle("/", r)
+	srv := &http.Server{
+		Handler:      loggedRouter,
+		Addr:         "0.0.0.0:5353",
+		WriteTimeout: 15 * time.Second,
+		ReadTimeout:  15 * time.Second,
+	}
+	fmt.Println("Listening on 0.0.0.0:5353")
+	srv.ListenAndServe()
+}

main.go

@@ -1,154 +1,114 @@
 package main
 
 import (
+	"fmt"
 	"log"
 	"time"
-	"fmt"
+
+	webserver "git.martyn.berlin/martyn/LEDController/internal/webserver"
+	queue "git.martyn.berlin/martyn/LEDController/internal/queue"
+	remapping "git.martyn.berlin/martyn/LEDController/internal/remapping"
+	patterns "git.martyn.berlin/martyn/LEDController/internal/patterns"
 
 	"github.com/Hundemeier/go-sacn/sacn"
 )
 
-func even(number int) bool {
-    return number%2 == 0
-}
+type RGBcolor = [3]byte
 
-func slice_rearrange(rowwidth int, rows int, alternaterows bool, inslice []byte) [][]byte {
-	var flippedslice []byte
-	if alternaterows {
-		flippedslice = make([]byte, len(inslice)+3)
-		for r := 0; r < rows; r++ {
-			rowzero := (r*rowwidth*3)
-			if even(r) {
-				for c := 0; c < (rowwidth)*3; c+=3 {
-					flippedslice[rowzero+c] = inslice[rowzero+c]
-					flippedslice[rowzero+c+1] = inslice[rowzero+c+1]
-					flippedslice[rowzero+c+2] = inslice[rowzero+c+2]
-				}
-			} else {
-				x := rowwidth*3
-				for c := 0; c < (rowwidth)*3; c+=3 {
-					x = x-3
-					fmt.Println(x)
-					flippedslice[rowzero+x] = inslice[rowzero+c]
-					flippedslice[rowzero+x+1] = inslice[rowzero+c+1]
-					flippedslice[rowzero+x+2] = inslice[rowzero+c+2]/*
-					flippedslice[rowzero+c] = inslice[rowzero+(((rowwidth-1)*3)-c)]
-					flippedslice[rowzero+c+1] = inslice[rowzero+(((rowwidth-1)*3)-c)-1]
-					flippedslice[rowzero+c+2] = inslice[rowzero+(((rowwidth-1)*3)-c)-2]*/
-				}
-			}
-		}
-	} else {
-		flippedslice = inslice
-	}
-	currentUniverse := 0
-	currentUniversePosition := 0
-	universes := make([][]byte, (len(flippedslice)/510)+1)
-	currentUniverseSlice := make([]byte, 511)
-	currentRowReverse := false;
-	for i := range(flippedslice) {
-		if currentUniversePosition >= 510 {
-			fmt.Println("Reached end of universe!")
-			universes[currentUniverse] = currentUniverseSlice
-			if (!currentRowReverse) {
-				currentRowReverse = true
-			} else {
-				currentRowReverse = false
-			}
-			currentUniverse += 1
-			currentUniversePosition = 0
-			currentUniverseSlice = make([]byte, 511)
-		}
-		currentUniverseSlice[currentUniversePosition] = flippedslice[i]
-		currentUniversePosition += 1
-	}
-	universes[currentUniverse] = currentUniverseSlice
-  	return universes
-}
+var currentFrame [2][512]byte
+var channels [2]chan<-[512]byte 
+var sema = make(chan struct{}, 1) // a binary semaphore guarding currentFrame
 
-func alternate(R0 byte, G0 byte, B0 byte, R1 byte, G1 byte, B1 byte, fromX int, toX int) []byte {
-	ret := make([]byte, toX*3);
-	for i := fromX; i < toX*3; i+=3 {
-		if even(i) {
-			ret[i] = R0
-			ret[i+1] = G0
-			ret[i+2] = B0
-		} else {
-			ret[i] = R1
-			ret[i+1] = G1
-			ret[i+2] = B1
+var currentEffect queue.QueueItem;
+var globalEffectChannel = make(chan queue.QueueItem, 1024)
+
+func foreverLoop() {
+	for /*ever*/ {
+		time.Sleep(40 * time.Millisecond) //25fps
+		for u := 0; u < 2; u++ {
+			sema <- struct{}{} // acquire token
+			channels[u] <- currentFrame[u]
+			<- sema
 		}
 	}
-    return ret
-}
-
-// gradient returns from fromX to toX fading from (fromR,fromG,fromB) to (toR,toG,toB)
-// at least that's the idea.
-func gradient(fromR byte, fromG byte, fromB byte, toR byte, toG byte, toB byte, fromX int, toX int) []byte {
-	ret := make([]byte, toX*3);
-	var stepR float32 = (float32(toR) - float32(fromR)) / (float32(toX) - float32(fromX))
-	var stepG float32 = (float32(toG) - float32(fromG)) / (float32(toX) - float32(fromX))
-	var stepB float32 = (float32(toB) - float32(fromB)) / (float32(toX) - float32(fromX))
-	for i := fromX; i < toX*3; i+=3 {
-		ret[i] = fromR+byte(float32(i/3)*stepR)
-		ret[i+1] = fromG+byte(float32(i/3)*stepG)
-		ret[i+2] = fromB+byte(float32(i/3)*stepB)
-	}
-    return ret
-}
-
-func slice512(s []byte) [512]byte {
-	var ret [512]byte
-	for i := range(s) {
-		if i < 512 {
-			ret[i] = s[i]
-		}
-	}
-	return ret
-}
-
-func sliceUnlenthed(s [512]byte) []byte {
-	ret := make([]byte, 512)
-	for i := range(s) {
-		ret[i] = s[i]
-	}
-	return ret
 }
 
 func main() {
+	go func() {
+		fmt.Printf("Starting webserver on port %s\n", "5353")
+		webserver.HandleHTTP(globalEffectChannel)
+	}()
 	//instead of "" you could provide an ip-address that the socket should bind to
-	trans, err := sacn.NewTransmitter("", [16]byte{1, 2, 3}, "test")
+	trans, err := sacn.NewTransmitter("", [16]byte{1, 2}, "test")
 	if err != nil {
 		log.Fatal(err)
 	}
-	
-	//activates the first universe
-	ch1, err := trans.Activate(1)
-	if err != nil {
-		log.Fatal(err)
-	}
-	ch2, err := trans.Activate(2)
-	if err != nil {
-		log.Fatal(err)
-	}
-	//deactivate the channel on exit
-	defer close(ch1)
-	defer close(ch2)
 
-	//set a unicast destination, and/or use multicast
-	trans.SetMulticast(1, false)//this specific setup will not multicast on windows, 
-	//because no bind address was provided
-	
-	//set some example ip-addresses
-	trans.SetDestinations(1, []string{"192.168.1.139"})
-	trans.SetMulticast(2, false)//this specific setup will not multicast on windows, 
-	trans.SetDestinations(2, []string{"192.168.1.139"})
-	
-	//send some random data for 10 seconds
-	for i := 0; i < 20; i++ {
-		channels := slice_rearrange(68,4,true,gradient(255,255,255,0,0,0,0,272))
-		ch1 <- slice512(channels[0])
-		ch2 <- slice512(channels[1])
-		time.Sleep(500 * time.Millisecond)
+	//activates the universes
+	for i := 0; i < 2; i++ {
+		channels[i], err =  trans.Activate(uint16(i+1))
+		//deactivate the channel on exit
+		defer close(channels[i])
+		trans.SetMulticast(uint16(i+1), false) //this specific setup will not multicast on windows,
+		trans.SetDestinations(uint16(i+1), []string{"192.168.1.139"})
 	}
-}
+
+	// Plasma for start frame
+	rearranged := remapping.SliceRearrange(68, 4, true, remapping.XYGridToLinear(68, 4, patterns.PlasmaPanel(68, 4, 40)))
+	currentFrame[0] = remapping.Slice512(rearranged[0])
+	currentFrame[1]	= remapping.Slice512(rearranged[1])
+	var e queue.QueueItem
+	e.Effect = "red"
+	e.Duration = 40 * 50
+	globalEffectChannel <- e
+	e.Effect = "plasma"
+	e.Duration = 0
+	e.Speed = 40
+	globalEffectChannel <- e
+
+	go func() {
+		for /*ever*/ {
+			if currentEffect.Duration > 0 {
+				currentEffect.Duration -= 40
+			} else {
+				if len(globalEffectChannel) > 0 {
+					currentEffect = <- globalEffectChannel
+				}
+			}
+			var rearranged [][]byte
+			switch currentEffect.Effect {
+				case "line":
+					rearranged = remapping.SliceRearrange(68, 4, true, remapping.XYGridToLinear(68, 4, patterns.ZigZag(68, 4)))
+				case "plasma":
+					rearranged = remapping.SliceRearrange(68, 4, true, remapping.XYGridToLinear(68, 4, patterns.PlasmaPanel(68, 4, currentEffect.Speed)))
+				case "red":
+					rearranged = remapping.SliceRearrange(68, 4, false, remapping.XYGridToLinear(68, 4, patterns.RedPanel(68,4)))
+				case "random":
+					rearranged = remapping.SliceRearrange(68, 4, false, remapping.XYGridToLinear(68, 4, patterns.RandomColourPanel(68,4,currentEffect.Speed)))
+				case "linearplasma":
+					rearranged = remapping.SliceRearrange(68, 4, false, patterns.LinearPlasma(68*4))
+				case "gradientred":
+					rearranged = remapping.SliceRearrange(68, 4, false, patterns.Gradient(255, 0, 0, 0, 0, 255, 0, 68*4))
+				case "sine":
+					var black patterns.RGBcolor
+					var red patterns.RGBcolor
+					red[0] = 255
+					rearranged = remapping.SliceRearrange(68, 4, true, remapping.XYGridToLinear(68, 4, patterns.Sinewave(68, 4, black, red, currentEffect.Speed)))
+				case "sinechase":
+					var black patterns.RGBcolor
+					var red patterns.RGBcolor
+					red[0] = 255
+					rearranged = remapping.SliceRearrange(68, 4, true, remapping.XYGridToLinear(68, 4, patterns.SineChase(68, 4, black, red, currentEffect.Speed)))
+			    default:
+					rearranged = remapping.SliceRearrange(68, 4, false, remapping.XYGridToLinear(68, 4, patterns.FillPanel(68,4, 128,0,128)))
+			}
+			//rearranged := remapping.SliceRearrange(68,4,true,linearPlasma(68*4))
+			sema <- struct{}{} // acquire token
+			currentFrame[0] = remapping.Slice512(rearranged[0])
+			currentFrame[1]	= remapping.Slice512(rearranged[1])
+			<- sema
+			time.Sleep(40 * time.Millisecond)
+		}
+	}()
+	foreverLoop();
+}