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world.go
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world.go
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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package engine
import (
"encoding/json"
"errors"
"fmt"
"math"
"os"
"github.com/hajimehoshi/ebiten/v2"
"github.com/divVerent/aaaaxy/internal/centerprint"
"github.com/divVerent/aaaaxy/internal/demo"
"github.com/divVerent/aaaaxy/internal/flag"
"github.com/divVerent/aaaaxy/internal/level"
"github.com/divVerent/aaaaxy/internal/log"
m "github.com/divVerent/aaaaxy/internal/math"
"github.com/divVerent/aaaaxy/internal/playerstate"
"github.com/divVerent/aaaaxy/internal/timing"
"github.com/divVerent/aaaaxy/internal/vfs"
)
var (
debugCountTiles = flag.Bool("debug_count_tiles", false, "count tiles set/cleared")
debugDetectLoadingConflicts = flag.Bool("debug_detect_loading_conflicts", false, "try to detect tile loading conflicts")
cheatInitialOrientation = flag.String("cheat_initial_orientation", "ES", "initial orientation of the game (BREAKS THINGS)")
cheatInitialCheckpoint = flag.String("cheat_initial_checkpoint", "", "initial checkpoint")
debugDumpVisiblePolygon = flag.Bool("debug_dump_visible_polygon", false, "dump the visible polygon to the log")
debugCheckTileWindowSize = flag.Bool("debug_check_tile_window_size", false, "if set, we verify that the tile window size is set high enough")
)
// World represents the current game state including its entities.
type World struct {
renderer renderer
// tiles are all tiles currently loaded.
tiles []*level.Tile
// incarnations are all currently existing entity incarnations.
incarnations map[EntityIncarnation]struct{}
// entities are all entities currently loaded.
entities entityList
// entitiesByZ are all entities, grouped by Z index.
entitiesByZ []entityList
// opaqueEntities are all opaque entities currently loaded.
opaqueEntities entityList
// Player is the player entity.
Player *Entity
// PlayerState is the managed persistent state of the player.
PlayerState playerstate.PlayerState
// Level is the current tilemap (universal covering with warpZones).
Level *level.Level
// Frame since last spawn. Used to let the world slowly "fade in".
FramesSinceSpawn int
// WarpZoneStates is the set of current overrides of warpzone state.
// WarpZones can be turned on/off at will, as long as they are offscreen.
WarpZoneStates map[string]bool
// TimerStarted is set on first input after game launch or reset.
TimerStarted bool
// TimerStopped is set when game time is paused.
TimerStopped bool
// MaxVisiblePixels is the max amount of pixels displayed from player origin.
MaxVisiblePixels int
// ForceCredits is set when we want to jump to credits.
ForceCredits bool
// GlobalColorM is a color matrix to apply to everything.
GlobalColorM ebiten.ColorM
// Properties that can in theory be regenerated from the above and thus do not
// need serialization support.
// scrollPos is the current screen scrolling position.
scrollPos m.Pos
// bottomRightTile is the tile at scrollPos.
bottomRightTile m.Pos
// frameVis is the current mark value to detect visible tiles/objects.
frameVis level.VisibilityFlags
// visTracing is set while tracing visibility and enables loading conflict detection
visTracing bool
// respawned is set if the player got respawned this frame.
respawned bool
// traceLineAndMarkPath receives the path from tracing visibility.
// Exists to reduce memory allocation.
traceLineAndMarkPath []m.Pos
// Tile counter.
tilesSet, tilesCleared int
// Checkpoint spawn offset.
prevCpID level.EntityID
prevCpOrigin m.Pos
// Name of the save state.
saveState int
}
// Initialized returns whether Init() has been called on this World before.
func (w *World) Initialized() bool {
return w.tiles != nil
}
func (w *World) tileIndex(pos m.Pos) int {
i := m.Mod(pos.X, tileWindowWidth) + m.Mod(pos.Y, tileWindowHeight)*tileWindowWidth
if *debugCheckTileWindowSize {
p := w.tilePos(i)
if p != pos {
log.Fatalf("accessed out of range tile: got %v, want near scroll tile %v", pos, w.bottomRightTile)
}
}
return i
}
func (w *World) tilePos(i int) m.Pos {
x := i % tileWindowWidth
y := i / tileWindowWidth
return m.Pos{
X: x + tileWindowWidth*m.Div(w.bottomRightTile.X-x, tileWindowWidth),
Y: y + tileWindowHeight*m.Div(w.bottomRightTile.Y-y, tileWindowHeight),
}
}
func (w *World) Tile(pos m.Pos) *level.Tile {
return w.tiles[w.tileIndex(pos)]
}
func (w *World) setTile(pos m.Pos, t *level.Tile) {
w.tiles[w.tileIndex(pos)] = t
w.tilesSet++
}
func (w *World) clearTile(pos m.Pos) {
w.tiles[w.tileIndex(pos)] = nil
w.tilesCleared++
}
func (w *World) forEachTile(f func(pos m.Pos, t *level.Tile)) {
for i, t := range w.tiles {
if t == nil {
continue
}
f(w.tilePos(i), t)
}
}
func (w *World) ForEachEntity(f func(e *Entity)) {
w.entities.forEach(func(e *Entity) error {
f(e)
return nil
})
}
func (w *World) clearEntities() {
w.entities.forEach(func(e *Entity) error {
if e != w.Player {
e.Impl.Despawn()
}
w.unlink(e)
return nil
})
}
func loadLevel() (*level.Level, error) {
// Load map.
lvl, err := level.Load("level")
if err != nil {
return nil, fmt.Errorf("could not load level: %v", err)
}
return lvl, nil
}
func Precache() error {
lvl, err := loadLevel()
if err != nil {
return err
}
return precacheEntities(lvl)
}
// Init brings a world into a working state.
// Can be called more than once to reset _everything_.
func (w *World) Init(saveState int) error {
lvl, err := loadLevel()
if err != nil {
return err
}
// Allow reiniting if already done.
w.clearEntities()
*w = World{
tiles: make([]*level.Tile, tileWindowWidth*tileWindowHeight),
incarnations: map[EntityIncarnation]struct{}{},
entities: makeList(allList),
opaqueEntities: makeList(opaqueList),
Level: lvl,
PlayerState: playerstate.PlayerState{
Level: lvl,
},
prevCpID: level.InvalidEntityID,
saveState: saveState,
}
w.renderer.Init(w)
// Load tile the player starts on.
w.setScrollPos(w.Level.Player.LevelPos.Mul(level.TileSize)) // Needed so we can set the tile.
tile := w.Level.Tile(w.Level.Player.LevelPos).Tile
tile.Transform = m.Identity()
w.setTile(w.Level.Player.LevelPos, &tile)
// Create player entity.
w.Player, err = w.Spawn(w.Level.Player, w.Level.Player.LevelPos, &tile)
if err != nil {
return fmt.Errorf("could not spawn player: %v", err)
}
// Respawn the player at the desired start location (includes other startup).
return w.RespawnPlayer("")
}
// Load loads the current savegame.
// If this fails, the world may be in an undefined state; call w.Init() or w.Load() to resume.
func (w *World) Load() error {
save, intercepted := demo.InterceptPreLoadGame()
if !intercepted {
state, err := vfs.ReadState(vfs.SavedGames, fmt.Sprintf("save-%d.json", w.saveState))
if errors.Is(err, os.ErrNotExist) {
save = nil // Not loading anything due to there being no state to load is OK.
} else if err != nil {
return err // Other error.
} else {
// Normal loading.
save = &level.SaveGame{}
err = json.Unmarshal(state, save)
if err != nil {
return err
}
}
}
// Make sure that demo playback will also go back to this save.
demo.InterceptPostLoadGame(save)
if save == nil {
return nil
}
err := w.Level.LoadGame(save)
if err != nil {
return err
}
return w.RespawnPlayer(w.PlayerState.LastCheckpoint())
}
// Save saves the current savegame.
func (w *World) Save() error {
save, err := w.Level.SaveGame()
if err != nil {
return err
}
if demo.InterceptSaveGame(save) {
return nil
}
state, err := json.MarshalIndent(save, "", "\t")
if err != nil {
return err
}
if flag.Cheating() {
return errors.New("not saving, as cheats are enabled")
}
return vfs.WriteState(vfs.SavedGames, fmt.Sprintf("save-%d.json", w.saveState), state)
}
// SpawnPlayer spawns the player in a newly initialized world.
// As a side effect, it unloads all tiles.
// Spawning at checkpoint "" means the initial player location.
func (w *World) RespawnPlayer(checkpointName string) error {
// Load whether we've seen this checkpoint in flipped state.
flipped := w.PlayerState.CheckpointSeen(checkpointName) == playerstate.SeenFlipped
if *cheatInitialCheckpoint != "" {
checkpointName = *cheatInitialCheckpoint
}
cpSp := w.Level.Checkpoints[checkpointName]
if cpSp == nil {
return fmt.Errorf("could not spawn player: checkpoint %q not found", checkpointName)
}
cpTransform := m.Identity()
cpTransformStr := cpSp.Properties["required_orientation"]
if cpTransformStr != "" {
var err error
cpTransform, err = m.ParseOrientation(cpTransformStr)
if err != nil {
return fmt.Errorf("could not parse checkpoint orientation: %v", err)
}
}
if flipped {
cpTransform = cpTransform.Concat(m.FlipX())
}
// First spawn the tile on the checkpoint.
tile := w.Level.Tile(cpSp.LevelPos).Tile
var err error
tile.Transform, err = m.ParseOrientation(*cheatInitialOrientation)
if err != nil {
return fmt.Errorf("could not parse initial orientation: %v", err)
}
tile.Transform = cpTransform.Concat(tile.Transform)
tile.Orientation = tile.Transform.Inverse().Concat(tile.Orientation)
tile.ResolveImage()
// Build a new world around the CP tile and the player.
w.frameVis = 0
tile.VisibilityFlags = w.frameVis
w.clearEntities()
w.link(w.Player)
w.tiles = make([]*level.Tile, tileWindowWidth*tileWindowHeight)
w.setScrollPos(cpSp.LevelPos.Mul(level.TileSize)) // Scroll the tile into view.
w.setTile(cpSp.LevelPos, &tile)
// Spawn the CP.
var cp *Entity
if cpSp == w.Level.Player {
cp = w.Player
} else {
var err error
cp, err = w.Spawn(cpSp, cpSp.LevelPos, &tile)
if err != nil {
return fmt.Errorf("could not spawn checkpoint: %v", err)
}
}
// Clear all centerprints.
centerprint.Reset()
// Reset the ending stuff.
w.TimerStopped = false
w.MaxVisiblePixels = math.MaxInt32
w.ForceCredits = false
w.GlobalColorM.Reset()
// Reset all warpzones.
w.WarpZoneStates = map[string]bool{}
// Move the player to the center of the checkpoint.
w.Player.Rect.Origin = cp.Rect.Origin.Add(cp.Rect.Size.Div(2)).Sub(w.Player.Rect.Size.Div(2))
// Load all the stuff that the player needs.
w.LoadTilesForRect(w.Player.Rect, cpSp.LevelPos)
// Show the fade in.
w.FramesSinceSpawn = 0
// Move the player down as far as possible.
if cpSp.Properties["downtrace_on_spawn"] != "false" {
var dir m.Delta
if onGroundVecStr := cpSp.Properties["vvvvvv_gravity_direction"]; onGroundVecStr != "" {
_, err := fmt.Sscanf(onGroundVecStr, "%d %d", &dir.DX, &dir.DY)
if err != nil {
return fmt.Errorf("invalid vvvvvv_gravity_direction: %v", err)
}
}
if dir.IsZero() {
dir = m.Delta{DX: 0, DY: 1}
}
trace := w.TraceBox(w.Player.Rect, w.Player.Rect.Origin.Add(dir.Mul(1024)), TraceOptions{
Contents: level.PlayerSolidContents,
NoEntities: true,
LoadTiles: true,
ForEnt: w.Player,
})
w.Player.Rect.Origin = trace.EndPos
}
// Note that TraceBox must have loaded all tiles the player needs.
// w.LoadTilesForRect(w.Player.Rect, cpSp.LevelPos)
w.frameVis ^= level.FrameVis
// Make sure respawning always gets back to this CP.
w.PlayerState.RecordCheckpoint(checkpointName, flipped)
// Notify the player, reset animation state.
w.Player.Impl.(PlayerEntityImpl).Respawned()
// Scroll the player in view right away.
w.setScrollPos(w.Player.Impl.(PlayerEntityImpl).LookPos())
// Adjust previous scroll position by how much the CP "moved".
// That way, respawning right after touching a CP will retain CP-near screen content.
// Mainly useful for VVVVVV mode.
if w.prevCpID == cp.Incarnation.ID {
cpDelta := cp.Rect.Origin.Delta(w.prevCpOrigin)
w.renderer.prevScrollPos = w.renderer.prevScrollPos.Add(cpDelta)
w.prevCpOrigin = cp.Rect.Origin
}
// Initialize whatever the checkpoint wants to do.
w.TouchEvent(cp, w.Player)
// Skip updating.
w.respawned = true
return nil
}
// TouchEvent notifies both entities that they touched the other.
func (w *World) TouchEvent(a *Entity, b *Entity) {
if a != nil {
a.Impl.Touch(b)
}
if b != nil {
b.Impl.Touch(a)
}
}
func (w *World) PlayerTouchedCheckpoint(cp *Entity) {
w.prevCpID = cp.Incarnation.ID
w.prevCpOrigin = cp.Rect.Origin
}
func (w *World) traceLineAndMark(from, to m.Pos, pathStore *[]m.Pos) TraceResult {
result := w.TraceLine(from, to, TraceOptions{
Contents: level.OpaqueContents,
LoadTiles: true,
ForEnt: w.Player,
PathOut: pathStore,
})
for _, tilePos := range *pathStore {
w.Tile(tilePos).VisibilityFlags = w.frameVis | level.TracedVis
}
return result
}
func (w *World) updateEntities() {
w.respawned = false
w.entities.forEach(func(ent *Entity) error {
ent.Impl.Update()
if w.respawned {
// Once respawned, stop further processing to avoid
// entities to interact with the respawned player.
return breakError
}
return nil
})
w.entities.compact()
for i := range w.entitiesByZ {
w.entitiesByZ[i].compact()
}
w.opaqueEntities.compact()
}
// updateScrollPos updates the current scroll position.
func (w *World) updateScrollPos(target m.Pos) {
// Slowly move towards focus point.
targetDelta := target.Delta(w.scrollPos)
scrollDelta := targetDelta.MulFloat(scrollPerFrame)
if scrollDelta.DX == 0 {
if targetDelta.DX > 0 {
scrollDelta.DX = +1
}
if targetDelta.DX < 0 {
scrollDelta.DX = -1
}
}
if scrollDelta.DY == 0 {
if targetDelta.DY > 0 {
scrollDelta.DY = +1
}
if targetDelta.DY < 0 {
scrollDelta.DY = -1
}
}
target = w.scrollPos.Add(scrollDelta)
// Ensure player is onscreen.
if target.X < w.Player.Rect.OppositeCorner().X-GameWidth/2+scrollMinDistance {
target.X = w.Player.Rect.OppositeCorner().X - GameWidth/2 + scrollMinDistance
}
if target.X > w.Player.Rect.Origin.X+GameWidth/2-scrollMinDistance {
target.X = w.Player.Rect.Origin.X + GameWidth/2 - scrollMinDistance
}
if target.Y < w.Player.Rect.OppositeCorner().Y-GameHeight/2+scrollMinDistance {
target.Y = w.Player.Rect.OppositeCorner().Y - GameHeight/2 + scrollMinDistance
}
if target.Y > w.Player.Rect.Origin.Y+GameHeight/2-scrollMinDistance {
target.Y = w.Player.Rect.Origin.Y + GameHeight/2 - scrollMinDistance
}
w.setScrollPos(target)
}
func (w *World) setScrollPos(pos m.Pos) {
w.scrollPos = pos
w.bottomRightTile = pos.Div(level.TileSize).Add(m.Delta{DX: tileWindowWidth / 2, DY: tileWindowHeight / 2})
}
// updateVisibility loads all visible tiles and discards all tiles not visible right now.
func (w *World) updateVisibility(eye m.Pos, maxDist int) {
if maxDist < 1 {
// Require at least 1 pixel trace distance, or else our polygon can't be correctly expanded.
maxDist = 1
}
defer timing.Group()()
// Reset visibility!
w.frameVis ^= level.FrameVis
// Always mark the eye tile.
timing.Section("eye")
eyePos := eye.Div(level.TileSize)
w.Tile(eyePos).VisibilityFlags = w.frameVis | level.TracedVis
// Trace from player location to all directions (sweepStep pixels at screen edge).
// Mark all tiles hit (excl. the tiles that stopped us).
timing.Section("trace")
screen0 := w.scrollPos.Sub(m.Delta{DX: GameWidth / 2, DY: GameHeight / 2})
screen1 := screen0.Add(m.Delta{DX: GameWidth - 1, DY: GameHeight - 1})
w.renderer.visiblePolygonCenter = eye
// Pick xLen so that it is the SMALLEST xLen so that screen0+sweepStep*xLen>=screen1.
xLen := (screen1.X - screen0.X + sweepStep - 1) / sweepStep
yLen := (screen1.Y - screen0.Y + sweepStep - 1) / sweepStep
wantLen := 2*xLen + 2*yLen
if len(w.renderer.visiblePolygon) != wantLen {
if w.renderer.visiblePolygon != nil {
log.Infof("visible polygon size changed - unexpected but harmless; optimize for resizing and remove this check then, I guess: got %v, want %v", len(w.renderer.visiblePolygon), wantLen)
}
w.renderer.visiblePolygon = make([]m.Pos, wantLen)
}
addTrace := func(rawTarget m.Pos, index int) {
delta := rawTarget.Delta(w.scrollPos).WithMaxLength(float64(maxDist))
target := w.scrollPos.Add(delta)
trace := w.traceLineAndMark(eye, target, &w.traceLineAndMarkPath)
w.renderer.visiblePolygon[index] = trace.EndPos
}
w.visTracing = true
for i := 0; i < xLen; i++ {
addTrace(m.Pos{X: screen0.X + sweepStep*i, Y: screen0.Y}, i)
addTrace(m.Pos{X: screen1.X - sweepStep*i, Y: screen1.Y}, xLen+yLen+i)
}
for i := 0; i < yLen; i++ {
addTrace(m.Pos{X: screen1.X, Y: screen0.Y + sweepStep*i}, xLen+i)
addTrace(m.Pos{X: screen0.X, Y: screen1.Y - sweepStep*i}, 2*xLen+yLen+i)
}
w.visTracing = false
if *expandUsingVertices {
if *expandUsingVerticesAccurately {
w.renderer.expandedVisiblePolygon = expandMinkowski(w.renderer.visiblePolygon, expandSize)
} else {
w.renderer.expandedVisiblePolygon = expandSimple(w.renderer.visiblePolygonCenter, w.renderer.visiblePolygon, expandSize)
}
} else {
w.renderer.expandedVisiblePolygon = w.renderer.visiblePolygon
}
if *debugDumpVisiblePolygon {
log.Infof("visible polygon: %v", w.renderer.visiblePolygon)
log.Infof("expanded polygon: %v", w.renderer.expandedVisiblePolygon)
}
// BUG: the above also loads tiles (but doesn't mark) if their path was blocked by an entity.
// Workaround: mark them as if they were previous frame's tiles, so they're not a basis for loading and get cleared at the end if needed.
timing.Section("untrace_workaround")
w.forEachTile(func(pos m.Pos, tile *level.Tile) {
if tile.VisibilityFlags == w.frameVis {
tile.VisibilityFlags ^= level.FrameVis
}
})
// Also mark all neighbors of hit tiles hit (up to expandTiles).
// For multiple expansion, need to do this in steps so initially we only base expansion on visible tiles.
timing.Section("expand")
markedTiles := []m.Pos{}
justTraced := w.frameVis | level.TracedVis
w.forEachTile(func(tilePos m.Pos, tile *level.Tile) {
if tile.VisibilityFlags == justTraced {
markedTiles = append(markedTiles, tilePos)
}
})
numExpandSteps := (2*expandTiles+1)*(2*expandTiles+1) - 1
for i := 0; i < numExpandSteps; i++ {
step := &expandSteps[i]
for _, pos := range markedTiles {
from := pos.Add(step.from)
to := pos.Add(step.to)
// It's not OK to load from an opaque tile, as that may sidestep warpzones.
// So, pick an alternative in that case, or skip expanding entirely.
if w.Tile(from).Contents.Opaque() {
from = pos.Add(step.from2)
if w.Tile(from).Contents.Opaque() {
from = pos.Add(step.from3)
if w.Tile(from).Contents.Opaque() {
continue
}
}
}
w.LoadTile(from, to, to.Delta(from))
}
}
timing.Section("spawn_search")
w.forEachTile(func(pos m.Pos, tile *level.Tile) {
if tile.VisibilityFlags&level.FrameVis != w.frameVis {
return
}
for _, spawnable := range tile.Spawnables {
_, err := w.Spawn(spawnable, pos, tile)
if err != nil {
log.Errorf("Could not spawn entity %v: %v", spawnable, err)
}
}
})
timing.Section("despawn_search")
w.entities.forEach(func(ent *Entity) error {
tp0, tp1 := tilesBox(ent.Rect)
var pos *m.Pos
DESPAWN_SEARCH:
for y := tp0.Y; y <= tp1.Y; y++ {
for x := tp0.X; x <= tp1.X; x++ {
tp := m.Pos{X: x, Y: y}
tile := w.Tile(tp)
if tile == nil {
continue
}
if tile.VisibilityFlags&level.FrameVis == w.frameVis {
pos = &tp
break DESPAWN_SEARCH
}
}
}
if pos != nil {
if ent.RequireTiles {
w.LoadTilesForTileBox(tp0, tp1, *pos)
for y := tp0.Y; y <= tp1.Y; y++ {
for x := tp0.X; x <= tp1.X; x++ {
tp := m.Pos{X: x, Y: y}
tile := w.Tile(tp)
if tile == nil {
continue
}
if tile.VisibilityFlags&level.FrameVis != w.frameVis {
tile.VisibilityFlags = w.frameVis
}
}
}
}
} else {
ent.Impl.Despawn()
w.unlink(ent)
}
return nil
})
// Delete all unmarked tiles.
timing.Section("cleanup_unmarked")
w.forEachTile(func(pos m.Pos, tile *level.Tile) {
if tile.VisibilityFlags&level.FrameVis != w.frameVis {
w.clearTile(pos)
}
})
}
func (w *World) Update() error {
defer timing.Group()()
w.FramesSinceSpawn++
// Let everything move.
timing.Section("entities")
w.updateEntities()
// Fetch the player entity.
playerImpl := w.Player.Impl.(PlayerEntityImpl)
// Scroll towards the focus point.
w.updateScrollPos(playerImpl.LookPos())
// Update visibility and spawn/despawn entities.
timing.Section("visibility")
pixels := w.FramesSinceSpawn * pixelsPerSpawnFrame
if pixels > w.MaxVisiblePixels {
pixels = w.MaxVisiblePixels
}
w.updateVisibility(playerImpl.EyePos(), pixels)
// Update centerprints.
centerprint.Update()
if *debugCountTiles {
log.Infof("%d tiles set, %d tiles cleared", w.tilesSet, w.tilesCleared)
}
w.tilesSet, w.tilesCleared = 0, 0
w.renderer.needPrevImage = true
return nil
}
// SetWarpZoneState overrides the enabled/disabled state of a warpzone.
// This state resets on respawn.
func (w *World) SetWarpZoneState(name string, state bool) {
w.WarpZoneStates[name] = state
}
// LoadTile loads the next tile into the current world based on a currently
// known tile and its neighbor. Respects and applies warps.
func (w *World) LoadTile(p, newPos m.Pos, d m.Delta) *level.Tile {
tile := w.Tile(newPos)
if tile != nil {
if tile.VisibilityFlags&level.FrameVis == w.frameVis && !*debugDetectLoadingConflicts {
// Already loaded this frame.
return tile
}
// From now on we know it doesn't have the same FrameVis.
if tile.LoadedFromNeighbor == p {
// Loading from same neighbor as before is OK.
tile.VisibilityFlags = w.frameVis
return tile
}
}
neighborTile := w.Tile(p)
if neighborTile == nil {
log.Errorf("Trying to load with nonexisting neighbor tile at %v", p)
return nil // Can't load.
}
if neighborTile.Contents.Opaque() {
log.Errorf("Trying to load from an opaque tile at %v", p)
return nil // Can't load.
}
t := neighborTile.Transform
neighborLevelPos := neighborTile.LevelPos
newLevelPos := neighborLevelPos.Add(t.Apply(d))
newLevelTile := w.Level.Tile(newLevelPos)
if newLevelTile == nil {
log.Debugf("Trying to load nonexisting tile at %v when moving from %v (%v) by %v (%v)", newLevelPos, p, neighborLevelPos, d, t.Apply(d))
newTile := &level.Tile{
LevelPos: newLevelPos,
Transform: t,
LoadedFromNeighbor: p,
VisibilityFlags: w.frameVis,
}
w.setTile(newPos, newTile)
return newTile
}
warped := false
for _, warp := range newLevelTile.WarpZones {
// Don't enter warps from behind.
if warp.PrevTile != neighborLevelPos {
continue
}
// Honor the warpzone toggle state.
if warp.Switchable {
if w.WarpZoneStates[warp.Name] == warp.Invert {
continue
}
}
if warped {
log.Errorf("More than one active warpzone on %v", newLevelTile)
return nil // Can't load.
}
warped = true
t = warp.Transform.Concat(t)
tile := w.Level.Tile(warp.ToTile)
if tile == nil {
log.Errorf("Nil new tile after warping to %v", warp)
return nil // Can't load.
}
newLevelTile = tile
}
if tile != nil {
if tile.LevelPos == newLevelTile.Tile.LevelPos && tile.Transform == t {
// Same tile as we had before. Can skip the copying.
tile.LoadedFromNeighbor = p
tile.VisibilityFlags = w.frameVis
return tile
} else if w.visTracing && tile.VisibilityFlags&level.FrameVis == w.frameVis {
// Damn... these loading conflicts are actually normal and happen around all warpzones.
// Thus it'd be nice to have a better way to detect "bad" stuff.
// We only really care about loading conflicts during visibility tracing.
// TODO: During expanding it's normal, so detect that situation here.
log.Fatalf("conflict loading tile at %v: loaded from %v (%v) and %v by %v (%v).",
newPos, tile.LoadedFromNeighbor, tile.LevelPos, p, d, newLevelTile.Tile.LevelPos)
}
}
newTile := newLevelTile.Tile
newTile.Transform = t
// Orientation is inverse of the transform, as the transform is for loading
// new tiles ("which tilemap direction is looking right on the screen") and
// the orientation is for rendering ("how to rotate the sprite").
newTile.Orientation = t.Inverse().Concat(newTile.Orientation)
newTile.ResolveImage()
newTile.LoadedFromNeighbor = p
newTile.VisibilityFlags = w.frameVis
w.setTile(newPos, &newTile)
return &newTile
}
// tilesBox returns corner coordinates for all tiles in a given box.
func tilesBox(r m.Rect) (m.Pos, m.Pos) {
tp0 := r.Origin.Div(level.TileSize)
tp1 := r.OppositeCorner().Div(level.TileSize)
return tp0, tp1
}
// LoadTilesForRect loads all tiles in the given box (p, d), assuming tile tp is already loaded.
func (w *World) LoadTilesForRect(r m.Rect, tp m.Pos) {
tp0, tp1 := tilesBox(r)
w.LoadTilesForTileBox(tp0, tp1, tp)
}
// LoadTilesForTileBox loads all tiles in the given tile based box, assuming tile tp is already loaded.
func (w *World) LoadTilesForTileBox(tp0, tp1, tp m.Pos) {
// In range, load all.
for y := tp.Y; y > tp0.Y; y-- {
pos := m.Pos{X: tp.X, Y: y}
w.LoadTile(pos, pos.Add(m.North()), m.North())
}
for y := tp.Y; y < tp1.Y; y++ {
pos := m.Pos{X: tp.X, Y: y}
w.LoadTile(pos, pos.Add(m.South()), m.South())
}
for y := tp0.Y; y <= tp1.Y; y++ {
for x := tp.X; x > tp0.X; x-- {
pos := m.Pos{X: x, Y: y}
w.LoadTile(pos, pos.Add(m.West()), m.West())
}
for x := tp.X; x < tp1.X; x++ {
pos := m.Pos{X: x, Y: y}
w.LoadTile(pos, pos.Add(m.East()), m.East())
}
}
}
// TraceLine moves from x,y by dx,dy in pixel coordinates.
func (w *World) TraceLine(from, to m.Pos, o TraceOptions) TraceResult {
return traceLine(w, from, to, o)
}
// TraceBox moves from x,y size sx,sy by dx,dy in pixel coordinates.
func (w *World) TraceBox(from m.Rect, to m.Pos, o TraceOptions) TraceResult {
return traceBox(w, from, to, o)
}
func (w *World) Draw(screen *ebiten.Image) {
w.renderer.Draw(screen)
}
func encodeZ(z int) int {
if z < 0 {
return -1 - 2*z
} else {
return 2 * z
}
}
func zBounds(l int) (min, max int) {
last := l - 1
max = last / 2
min = -max - last%2
return
}
func (w *World) unlink(e *Entity) {
z := encodeZ(e.zIndex)
w.entitiesByZ[z].remove(e)
if e.contents.Opaque() {
w.opaqueEntities.remove(e)
}
w.entities.remove(e)
if e.Incarnation.IsValid() {
delete(w.incarnations, e.Incarnation)
}
}
func (w *World) link(e *Entity) {
if e.Incarnation.IsValid() {
w.incarnations[e.Incarnation] = struct{}{}
}
w.entities.insert(e)
if e.contents.Opaque() {
w.opaqueEntities.insert(e)
}
z := encodeZ(e.zIndex)
for len(w.entitiesByZ) <= z {
w.entitiesByZ = append(w.entitiesByZ, makeList(zList))
}
w.entitiesByZ[z].insert(e)
}
func (w *World) EntityIsAlive(incarnation EntityIncarnation) bool {
_, found := w.incarnations[incarnation]
return found
}
func (w *World) FindName(name string) []*Entity {
// TODO maybe optimize this too by an intrusive list?
var out []*Entity
w.entities.forEach(func(ent *Entity) error {
if ent.name == name {
out = append(out, ent)
}
return nil
})
return out
}
func (w *World) FindContents(c level.Contents) []*Entity {
// TODO maybe keep such a list for all contents masks?
if c == level.OpaqueContents {
return w.opaqueEntities.items
}
var out []*Entity
w.entities.forEach(func(ent *Entity) error {
if ent.contents&c != 0 {
out = append(out, ent)
}
return nil
})
return out
}