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roomstate.go
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roomstate.go
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package main
import (
"fmt"
"image"
"image/color"
"image/gif"
"sync"
)
type ScanState struct {
t MapCoord
d Direction
s LinkState
}
type ExitPoint struct {
Supertile
Point MapCoord
Direction
WorthMarking bool
}
type EntryPoint struct {
Supertile
Point MapCoord
Direction
//LinkState
From ExitPoint
}
func (ep EntryPoint) String() string {
//return fmt.Sprintf("{%s, %s, %s, %s}", ep.Supertile, ep.Point, ep.Direction, ep.LinkState)
return fmt.Sprintf("{%s, %s, %s}", ep.Supertile, ep.Point, ep.Direction)
}
type RoomState struct {
sync.Mutex
Supertile
IsLoaded bool
Rendered image.Image
gif.GIF
Animated gif.GIF // single room drawing animation
AnimatedTileMap [][0x4000]byte
AnimatedLayers []int
AnimatedLayer int
EntryPoints []EntryPoint
ExitPoints []ExitPoint
WarpExitTo Supertile
StairExitTo [4]Supertile
WarpExitLayer MapCoord
StairTargetLayer [4]MapCoord
Doors []Door
Stairs []MapCoord
SwapLayers map[MapCoord]empty // $06C0[size=$044E >> 1]
TilesVisited map[MapCoord]empty
TilesVisitedStar0 map[MapCoord]empty
TilesVisitedStar1 map[MapCoord]empty
TilesVisitedTag0 map[MapCoord]empty
TilesVisitedTag1 map[MapCoord]empty
Tiles [0x2000]byte
Reachable [0x2000]byte
Hookshot map[MapCoord]byte
e System
WRAM [0x20000]byte
VRAMTileSet [0x4000]byte
markedPit bool
markedFloor bool
lifoSpace [0x2000]ScanState
lifo []ScanState
}
func CreateRoom(st Supertile, initEmu *System) (room *RoomState) {
var err error
//fmt.Printf(" creating room %s\n", st)
room = &RoomState{
Supertile: st,
Rendered: nil,
Hookshot: make(map[MapCoord]byte, 0x2000),
TilesVisitedStar0: make(map[MapCoord]empty, 0x2000),
TilesVisitedStar1: make(map[MapCoord]empty, 0x2000),
TilesVisitedTag0: make(map[MapCoord]empty, 0x2000),
TilesVisitedTag1: make(map[MapCoord]empty, 0x2000),
}
room.TilesVisited = room.TilesVisitedStar0
e := &room.e
// have the emulator's WRAM refer to room.WRAM
e.WRAM = &room.WRAM
if err = e.InitEmulatorFrom(initEmu); err != nil {
panic(err)
}
return
}
func (room *RoomState) Init() (err error) {
if room.IsLoaded {
return
}
st := room.Supertile
e := &room.e
wram := (e.WRAM)[:]
vram := (e.VRAM)[:]
tiles := room.Tiles[:]
// load and draw current supertile:
write16(wram, 0xA0, uint16(st))
if animateRoomDrawing {
// clear tile map first:
tilemap := e.WRAM[0x2000:0x6000]
for i := range tilemap {
tilemap[i] = 0x00
}
captureStart := false
room.AnimatedLayer = 0
doCapture := func() {
if captureStart {
room.CaptureRoomDrawFrame()
}
}
e.CPU.OnPC = make(map[uint32]func())
//#_018834: JSR RoomDraw_DrawAllObjects
//#_018837: PLY
e.CPU.OnPC[0x01_8837] = func() {
// start capturing after basic room layout (template) is drawn:
captureStart = true
room.AnimatedLayer++
doCapture()
}
// draw layer 2:
e.CPU.OnPC[0x01_885F] = func() {
room.AnimatedLayer++
//doCapture()
}
// draw layer 3 (aka doors):
e.CPU.OnPC[0x01_8874] = func() {
room.AnimatedLayer++
//doCapture()
}
//RoomDraw_A_Many32x32Blocks:#_018A44
//#_018A88: RTS
e.CPU.OnPC[0x01_8A88] = doCapture
//#_01880F: JSR RoomDraw_DrawFloors
//#_018812: LDY.b $BA
e.CPU.OnPC[0x01_8812] = doCapture
//#_0188F8: JSR RoomData_DrawObject
//#_0188FB: BRA .next
e.CPU.OnPC[0x01_88FB] = doCapture
//#_01890D: JSR RoomData_DrawObject_Door
//#_018910: INC.b $BA
e.CPU.OnPC[0x01_8910] = doCapture
}
//e.LoggerCPU = e.Logger
if err = e.ExecAt(loadSupertilePC, donePC); err != nil {
return
}
//e.LoggerCPU = nil
if animateRoomDrawing {
// capture final frame:
room.CaptureRoomDrawFrame()
// copy final frame to first frame so it works as a preview image:
frames := make([][0x4000]byte, 0, len(room.AnimatedTileMap)+1)
frames = append(frames, room.AnimatedTileMap[len(room.AnimatedTileMap)-1])
frames = append(frames, room.AnimatedTileMap[1:]...)
room.AnimatedTileMap = frames
e.CPU.OnPC = nil
}
copy((&room.VRAMTileSet)[:], vram[0x4000:0x8000])
copy(tiles, wram[0x12000:0x14000])
// make a map full of $01 Collision and carve out reachable areas:
for i := range room.Reachable {
room.Reachable[i] = 0x01
}
//ioutil.WriteFile(fmt.Sprintf("data/%03X.wram", uint16(st)), wram, 0644)
//ioutil.WriteFile(fmt.Sprintf("data/%03X.tmap", uint16(st)), tiles, 0644)
room.WarpExitTo = Supertile(read8(wram, 0xC000))
room.StairExitTo = [4]Supertile{
Supertile(read8(wram, uint32(0xC001))),
Supertile(read8(wram, uint32(0xC002))),
Supertile(read8(wram, uint32(0xC003))),
Supertile(read8(wram, uint32(0xC004))),
}
room.WarpExitLayer = MapCoord(read8(wram, uint32(0x063C))&2) << 11
room.StairTargetLayer = [4]MapCoord{
MapCoord(read8(wram, uint32(0x063D))&2) << 11,
MapCoord(read8(wram, uint32(0x063E))&2) << 11,
MapCoord(read8(wram, uint32(0x063F))&2) << 11,
MapCoord(read8(wram, uint32(0x0640))&2) << 11,
}
//fmt.Printf(" TAG1 = %02x\n", read8(wram, 0xAE))
//fmt.Printf(" TAG2 = %02x\n", read8(wram, 0xAF))
//fmt.Printf(" WARPTO = %s\n", Supertile(read8(wram, 0xC000)))
//fmt.Printf(" STAIR0TO = %s\n", Supertile(read8(wram, 0xC001)))
//fmt.Printf(" STAIR1TO = %s\n", Supertile(read8(wram, 0xC002)))
//fmt.Printf(" STAIR2TO = %s\n", Supertile(read8(wram, 0xC003)))
//fmt.Printf(" STAIR3TO = %s\n", Supertile(read8(wram, 0xC004)))
//fmt.Printf(" DARK = %v\n", room.IsDarkRoom())
// process doors first:
doors := make([]Door, 0, 16)
for m := 0; m < 16; m++ {
tpos := read16(wram, uint32(0x19A0+(m<<1)))
// stop marker:
if tpos == 0 {
//fmt.Printf(" door stop at marker\n")
break
}
door := Door{
Pos: MapCoord(tpos >> 1),
Type: DoorType(read16(wram, uint32(0x1980+(m<<1)))),
Dir: Direction(read16(wram, uint32(0x19C0+(m<<1)))),
}
doors = append(doors, door)
//fmt.Printf(" door: %v\n", door)
isDoorEdge, _, _, _ := door.Pos.IsDoorEdge()
{
// open up doors that are in front of interroom stairwells:
var stair MapCoord
switch door.Dir {
case DirNorth:
stair = door.Pos + 0x01
break
case DirSouth:
stair = door.Pos + 0xC1
break
case DirEast:
stair = door.Pos + 0x43
break
case DirWest:
stair = door.Pos + 0x40
break
}
v := tiles[stair]
if v >= 0x30 && v <= 0x39 {
tiles[door.Pos+0x41+0x00] = 0x00
tiles[door.Pos+0x41+0x01] = 0x00
tiles[door.Pos+0x41+0x40] = 0x00
tiles[door.Pos+0x41+0x41] = 0x00
}
}
if door.Type.IsExit() {
lyr, row, col := door.Pos.RowCol()
// patch up the door tiles to prevent reachability from exiting:
for y := uint16(0); y < 4; y++ {
for x := uint16(0); x < 4; x++ {
t := lyr | (row+y)<<6 | (col + x)
if tiles[t] >= 0xF0 {
tiles[t] = 0x00
}
}
}
continue
}
if door.Type == 0x30 {
// exploding wall:
pos := int(door.Pos)
//fmt.Printf(" exploding wall %s\n", door.Pos)
for c := 0; c < 11; c++ {
for r := 0; r < 12; r++ {
tiles[pos+(r<<6)-c] = 0
tiles[pos+(r<<6)+1+c] = 0
}
}
continue
}
if isDoorEdge {
// blow open edge doorways:
var (
start MapCoord
tn MapCoord
doorTileType uint8
doorwayTile uint8
adj int
)
var ok bool
lyr, _, _ := door.Pos.RowCol()
switch door.Dir {
case DirNorth:
start = door.Pos + 0x81
doorwayTile = 0x80 | uint8(lyr>>10)
adj = 1
break
case DirSouth:
start = door.Pos + 0x41
doorwayTile = 0x80 | uint8(lyr>>10)
adj = 1
break
case DirEast:
start = door.Pos + 0x41
doorwayTile = 0x81 | uint8(lyr>>10)
adj = 0x40
break
case DirWest:
start = door.Pos + 0x42
doorwayTile = 0x81 | uint8(lyr>>10)
adj = 0x40
break
}
doorTileType = tiles[start]
if doorTileType < 0xF0 {
// don't blow this doorway; it's custom:
continue
}
tn = start
canBlow := func(v uint8) bool {
if v == 0x01 || v == 0x00 {
return true
}
if v == doorTileType {
return true
}
if v >= 0x28 && v <= 0x2B {
return true
}
if v == 0x10 {
// slope?? found in sanctuary $002
return true
}
return false
}
for i := 0; i < 12; i++ {
v := tiles[tn]
if canBlow(v) {
//fmt.Printf(" blow open %s\n", tn)
tiles[tn] = doorwayTile
//fmt.Printf(" blow open %s\n", MapCoord(int(tn)+adj))
tiles[int(tn)+adj] = doorwayTile
} else {
panic(fmt.Errorf("something blocking the doorway at %s: $%02x", tn, v))
break
}
tn, _, ok = tn.MoveBy(door.Dir, 1)
if !ok {
break
}
}
continue
}
//if !isDoorEdge
{
var (
start MapCoord
tn MapCoord
doorTileType uint8
maxCount int
count int
doorwayTile uint8
adj int
)
var ok bool
lyr, _, _ := door.Pos.RowCol()
switch door.Dir {
case DirNorth:
start = door.Pos + 0x81
maxCount = 12
doorwayTile = 0x80 | uint8(lyr>>10)
adj = 1
break
case DirSouth:
start = door.Pos + 0x41
maxCount = 12
doorwayTile = 0x80 | uint8(lyr>>10)
adj = 1
break
case DirEast:
start = door.Pos + 0x42
maxCount = 10
doorwayTile = 0x81 | uint8(lyr>>10)
adj = 0x40
break
case DirWest:
start = door.Pos + 0x42
maxCount = 10
doorwayTile = 0x81 | uint8(lyr>>10)
adj = 0x40
break
}
var mustStop func(uint8) bool
doorTileType = tiles[start]
if doorTileType >= 0x80 && doorTileType <= 0x8D {
mustStop = func(v uint8) bool {
if v == 0x01 {
return false
}
if v >= 0x28 && v <= 0x2B {
return false
}
if v == doorwayTile {
return false
}
if v >= 0xF0 {
return false
}
return true
}
} else if doorTileType >= 0xF0 {
oppositeDoorType := uint8(0)
if doorTileType >= 0xF8 {
oppositeDoorType = doorTileType - 8
} else if doorTileType >= 0xF0 {
oppositeDoorType = doorTileType + 8
}
mustStop = func(v uint8) bool {
if v == 0x01 {
return false
}
if v == doorwayTile {
return false
}
if v == oppositeDoorType {
return false
}
if v == doorTileType {
return false
}
if v >= 0x28 && v <= 0x2B {
// ledge tiles can be found in doorway in fairy cave $008:
return false
}
return true
}
} else {
// bad door starter tile type
//fmt.Printf(fmt.Sprintf("unrecognized door tile at %s: $%02x\n", start, doorTileType))
continue
}
// check many tiles behind door for opposite door tile:
i := 0
tn = start
for ; i < maxCount; i++ {
v := tiles[tn]
if mustStop(v) {
break
}
tn, _, ok = tn.MoveBy(door.Dir, 1)
if !ok {
break
}
}
count = i
// blow open the doorway:
tn = start
for i := 0; i < count; i++ {
v := tiles[tn]
if mustStop(v) {
break
}
//fmt.Printf(" blow open %s\n", tn)
tiles[tn] = doorwayTile
//fmt.Printf(" blow open %s\n", mapCoord(int(tn)+adj))
tiles[int(tn)+adj] = doorwayTile
tn, _, _ = tn.MoveBy(door.Dir, 1)
}
}
}
room.Doors = doors
// find layer-swap tiles in doorways:
swapCount := read16(wram, 0x044E)
room.SwapLayers = make(map[MapCoord]empty, swapCount*4)
for i := uint16(0); i < swapCount; i += 2 {
t := MapCoord(read16(wram, uint32(0x06C0+i)))
// mark the 2x2 tile as a layer-swap:
room.SwapLayers[t+0x00] = empty{}
room.SwapLayers[t+0x01] = empty{}
room.SwapLayers[t+0x40] = empty{}
room.SwapLayers[t+0x41] = empty{}
// have to put it on both layers? ew
room.SwapLayers[t|0x1000+0x00] = empty{}
room.SwapLayers[t|0x1000+0x01] = empty{}
room.SwapLayers[t|0x1000+0x40] = empty{}
room.SwapLayers[t|0x1000+0x41] = empty{}
}
// find interroom stair objects:
stairCount := uint32(0)
for _, n := range []uint32{0x0438, 0x043A, 0x047E, 0x0482, 0x0480, 0x0484, 0x04A2, 0x04A6, 0x04A4, 0x04A8} {
index := uint32(read16(wram, n))
if index > stairCount {
stairCount = index
}
}
for i := uint32(0); i < stairCount; i += 2 {
t := MapCoord(read16(wram, 0x06B0+i))
room.Stairs = append(room.Stairs, t)
//fmt.Printf(" interroom stair at %s\n", t)
}
for i := uint32(0); i < 0x20; i += 2 {
pos := MapCoord(read16(wram, 0x0540+i) >> 1)
if pos == 0 {
break
}
//fmt.Printf(
// " manipulable(%s): %02x, %04x @%04x -> %04x%04x,%04x%04x\n",
// pos,
// i,
// read16(wram, 0x0500+i), // MANIPPROPS
// read16(wram, 0x0520+i), // MANIPOBJX
// read16(wram, 0x0560+i), // MANIPRTNW
// read16(wram, 0x05A0+i), // MANIPRTNE
// read16(wram, 0x0580+i), // MANIPRTSW
// read16(wram, 0x05C0+i), // MANIPRTSE
//)
}
for i := uint32(0); i < 6; i++ {
gt := read16(wram, 0x06E0+i<<1)
if gt == 0 {
break
}
//fmt.Printf(" chest($%04x)\n", gt)
if gt&0x8000 != 0 {
// locked cell door:
t := MapCoord((gt & 0x7FFF) >> 1)
if tiles[t] == 0x58+uint8(i) {
tiles[t+0x00] = 0x00
tiles[t+0x01] = 0x00
tiles[t+0x40] = 0x00
tiles[t+0x41] = 0x00
}
if tiles[t|0x1000] == 0x58+uint8(i) {
tiles[t|0x1000+0x00] = 0x00
tiles[t|0x1000+0x01] = 0x00
tiles[t|0x1000+0x40] = 0x00
tiles[t|0x1000+0x41] = 0x00
}
}
}
// clear all enemy health to see if this triggers something:
for i := uint32(0); i < 16; i++ {
write8(room.WRAM[:], 0x0DD0+i, 0)
}
if false {
// start GIF with solid black frame:
room.GIF.BackgroundIndex = 0
room.GIF.Image = append(room.GIF.Image, image.NewPaletted(
image.Rect(0, 0, 512, 512),
color.Palette{
color.Black,
},
))
room.GIF.Delay = append(room.GIF.Delay, 2)
room.GIF.Disposal = append(room.GIF.Disposal, gif.DisposalNone)
}
// capture first room state:
room.DrawSupertile()
room.RenderAnimatedRoomDraw(animateRoomDrawingDelay)
f := len(room.GIF.Delay) - 1
if f >= 0 {
room.GIF.Delay[f] += 200
}
room.HandleRoomTags()
//ioutil.WriteFile(fmt.Sprintf("data/%03X.cmap", uint16(st)), (&room.Tiles)[:], 0644)
room.IsLoaded = true
return
}
func (r *RoomState) push(s ScanState) {
r.lifo = append(r.lifo, s)
}
func (r *RoomState) pushAllDirections(t MapCoord, s LinkState) {
mn, ms, mw, me := false, false, false, false
// can move in any direction:
if tn, dir, ok := t.MoveBy(DirNorth, 1); ok {
mn = true
r.push(ScanState{t: tn, d: dir, s: s})
}
if tn, dir, ok := t.MoveBy(DirWest, 1); ok {
mw = true
r.push(ScanState{t: tn, d: dir, s: s})
}
if tn, dir, ok := t.MoveBy(DirEast, 1); ok {
me = true
r.push(ScanState{t: tn, d: dir, s: s})
}
if tn, dir, ok := t.MoveBy(DirSouth, 1); ok {
ms = true
r.push(ScanState{t: tn, d: dir, s: s})
}
// check diagonals at pits; cannot squeeze between solid areas though:
if mn && mw && r.canDiagonal(r.Tiles[t-0x40]) && r.canDiagonal(r.Tiles[t-0x01]) {
r.push(ScanState{t: t - 0x41, d: DirNorth, s: s})
}
if mn && me && r.canDiagonal(r.Tiles[t-0x40]) && r.canDiagonal(r.Tiles[t+0x01]) {
r.push(ScanState{t: t - 0x3F, d: DirNorth, s: s})
}
if ms && mw && r.canDiagonal(r.Tiles[t+0x40]) && r.canDiagonal(r.Tiles[t-0x01]) {
r.push(ScanState{t: t + 0x3F, d: DirSouth, s: s})
}
if ms && me && r.canDiagonal(r.Tiles[t+0x40]) && r.canDiagonal(r.Tiles[t+0x01]) {
r.push(ScanState{t: t + 0x41, d: DirSouth, s: s})
}
}
func (r *RoomState) canDiagonal(v byte) bool {
return v == 0x20 || // pit
(v&0xF0 == 0xB0) // somaria/pipe
}
func (r *RoomState) IsDarkRoom() bool {
return read8((&r.WRAM)[:], 0xC005) != 0
}
// isAlwaysWalkable checks if the tile is always walkable on, regardless of state
func (r *RoomState) isAlwaysWalkable(v uint8) bool {
return v == 0x00 || // no collision
v == 0x09 || // shallow water
v == 0x22 || // manual stairs
v == 0x23 || v == 0x24 || // floor switches
(v >= 0x0D && v <= 0x0F) || // spikes / floor ice
v == 0x3A || v == 0x3B || // star tiles
v == 0x40 || // thick grass
v == 0x4B || // warp
v == 0x60 || // rupee tile
(v >= 0x68 && v <= 0x6B) || // conveyors
v == 0xA0 // north/south dungeon swap door (for HC to sewers)
}
// isMaybeWalkable checks if the tile could be walked on depending on what state it's in
func (r *RoomState) isMaybeWalkable(t MapCoord, v uint8) bool {
return v&0xF0 == 0x70 || // pots/pegs/blocks
v == 0x62 || // bombable floor
v == 0x66 || v == 0x67 // crystal pegs (orange/blue):
}
func (r *RoomState) canHookThru(v uint8) bool {
return v == 0x00 || // no collision
v == 0x08 || v == 0x09 || // water
(v >= 0x0D && v <= 0x0F) || // spikes / floor ice
v == 0x1C || v == 0x0C || // layer pass through
v == 0x20 || // pit
v == 0x22 || // manual stairs
v == 0x23 || v == 0x24 || // floor switches
(v >= 0x28 && v <= 0x2B) || // ledge tiles
v == 0x3A || v == 0x3B || // star tiles
v == 0x40 || // thick grass
v == 0x4B || // warp
v == 0x60 || // rupee tile
(v >= 0x68 && v <= 0x6B) || // conveyors
v == 0xB6 || // somaria start
v == 0xBC // somaria start
}
// isHookable determines if the tile can be attached to with a hookshot
func (r *RoomState) isHookable(v uint8) bool {
return v == 0x27 || // general hookable object
(v >= 0x58 && v <= 0x5D) || // chests (TODO: check $0500 table for kind)
v&0xF0 == 0x70 // pot/peg/block
}
func (r *RoomState) FindReachableTiles(
entryPoint EntryPoint,
visit func(s ScanState, v uint8),
) {
m := &r.Tiles
// if we ever need to wrap
f := visit
r.lifo = r.lifoSpace[:0]
r.push(ScanState{t: entryPoint.Point, d: entryPoint.Direction})
// handle the stack of locations to traverse:
for len(r.lifo) != 0 {
lifoLen := len(r.lifo) - 1
s := r.lifo[lifoLen]
r.lifo = r.lifo[:lifoLen]
if _, ok := r.TilesVisited[s.t]; ok {
continue
}
v := m[s.t]
if s.s == StatePipe {
// allow 00 and 01 in pipes for TR $015 center area:
if v == 0x00 || v == 0x01 {
// continue in the same direction:
//r.TilesVisited[s.t] = empty{}
f(s, v)
if tn, dir, ok := s.t.MoveBy(s.d, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
continue
}
// straight:
if v == 0xB0 || v == 0xB1 {
r.TilesVisited[s.t] = empty{}
f(s, v)
// check for pipe exit 3 tiles in advance:
// this is done to skip collision tiles between B0/B1 and BE
if tn, dir, ok := s.t.MoveBy(s.d, 3); ok && m[tn] == 0xBE {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
continue
}
// continue in the same direction:
if tn, dir, ok := s.t.MoveBy(s.d, 1); ok {
// if the pipe crosses another direction pipe skip over that bit of pipe:
if m[tn] == v^0x01 {
if tn, _, ok := tn.MoveBy(dir, 2); ok && v == m[tn] {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
continue
}
}
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
continue
}
// west to south or north to east:
if v == 0xB2 {
r.TilesVisited[s.t] = empty{}
f(s, v)
if s.d == DirWest {
if tn, dir, ok := s.t.MoveBy(DirSouth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
} else if s.d == DirNorth {
if tn, dir, ok := s.t.MoveBy(DirEast, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
}
continue
}
// south to east or west to north:
if v == 0xB3 {
r.TilesVisited[s.t] = empty{}
f(s, v)
if s.d == DirSouth {
if tn, dir, ok := s.t.MoveBy(DirEast, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
} else if s.d == DirWest {
if tn, dir, ok := s.t.MoveBy(DirNorth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
}
continue
}
// north to west or east to south:
if v == 0xB4 {
r.TilesVisited[s.t] = empty{}
f(s, v)
if s.d == DirNorth {
if tn, dir, ok := s.t.MoveBy(DirWest, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
} else if s.d == DirEast {
if tn, dir, ok := s.t.MoveBy(DirSouth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
}
continue
}
// east to north or south to west:
if v == 0xB5 {
r.TilesVisited[s.t] = empty{}
f(s, v)
if s.d == DirEast {
if tn, dir, ok := s.t.MoveBy(DirNorth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
} else if s.d == DirSouth {
if tn, dir, ok := s.t.MoveBy(DirWest, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
}
continue
}
// line exit:
if v == 0xB6 {
r.TilesVisited[s.t] = empty{}
f(s, v)
// check for 2 pit tiles beyond exit:
t := s.t
var ok bool
if t, _, ok = t.MoveBy(s.d, 1); !ok || m[t] != 0x20 {
continue
}
if t, _, ok = t.MoveBy(s.d, 1); !ok || m[t] != 0x20 {
continue
}
// continue in the same direction but not in pipe-follower state:
if tn, dir, ok := t.MoveBy(s.d, 1); ok && m[tn] == 0x00 {
r.push(ScanState{t: tn, d: dir})
}
continue
}
// south, west, east junction:
if v == 0xB7 {
// do not mark as visited in case we cross from the other direction later:
//r.TilesVisited[s.t] = empty{}
f(s, v)
if tn, dir, ok := s.t.MoveBy(DirSouth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirWest, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirEast, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
continue
}
// north, west, east junction:
if v == 0xB8 {
// do not mark as visited in case we cross from the other direction later:
//r.TilesVisited[s.t] = empty{}
f(s, v)
if tn, dir, ok := s.t.MoveBy(DirNorth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirWest, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirEast, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
continue
}
// north, east, south junction:
if v == 0xB9 {
// do not mark as visited in case we cross from the other direction later:
//r.TilesVisited[s.t] = empty{}
f(s, v)
if tn, dir, ok := s.t.MoveBy(DirNorth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirEast, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirSouth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
continue
}
// north, west, south junction:
if v == 0xBA {
// do not mark as visited in case we cross from the other direction later:
//r.TilesVisited[s.t] = empty{}
f(s, v)
if tn, dir, ok := s.t.MoveBy(DirNorth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirWest, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirSouth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
continue
}
// 4-way junction:
if v == 0xBB {
// do not mark as visited in case we cross from the other direction later:
//r.TilesVisited[s.t] = empty{}
f(s, v)
if tn, dir, ok := s.t.MoveBy(DirNorth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirWest, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirSouth, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
if tn, dir, ok := s.t.MoveBy(DirEast, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
continue
}
// possible exit:
if v == 0xBC {
// do not mark as visited in case we cross from the other direction later:
//r.TilesVisited[s.t] = empty{}
f(s, v)
// continue in the same direction:
if tn, dir, ok := s.t.MoveBy(s.d, 1); ok {
r.push(ScanState{t: tn, d: dir, s: StatePipe})
}
// check for exits across pits:
if tn, dir, ok := s.t.MoveBy(s.d.RotateCW(), 1); ok && m[tn] == 0x20 {
if tn, _, ok = tn.MoveBy(dir, 1); ok && m[tn] == 0x20 {
if tn, _, ok = tn.MoveBy(dir, 1); ok && m[tn] == 0x00 {
r.push(ScanState{t: tn, d: dir})
}
}
}
if tn, dir, ok := s.t.MoveBy(s.d.RotateCCW(), 1); ok && m[tn] == 0x20 {
if tn, _, ok = tn.MoveBy(dir, 1); ok && m[tn] == 0x20 {
if tn, _, ok = tn.MoveBy(dir, 1); ok && m[tn] == 0x00 {
r.push(ScanState{t: tn, d: dir})
}
}
}
continue
}