76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
package systems
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import (
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"image"
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"image/draw"
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"log/slog"
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. "openquell/components"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/mlange-42/arche/ecs"
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"github.com/mlange-42/arche/generic"
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)
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type GridSystem struct {
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World *ecs.World
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Selector *generic.Filter3[Renderable, Position, Solid]
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UseCache bool
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Cache *ebiten.Image
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Count int // register tile count, invalidates cache
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Background *ebiten.Image
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Width, Height, Tilesize int
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}
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func NewGridSystem(world *ecs.World, width, height,
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tilesize int, background *ebiten.Image) System {
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cache := ebiten.NewImage(width, height)
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system := &GridSystem{
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Selector: generic.NewFilter3[Renderable, Position, Solid](),
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UseCache: false,
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Cache: cache,
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Width: width,
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Height: height,
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Tilesize: tilesize,
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Background: background,
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World: world,
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}
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return system
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}
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func (system *GridSystem) Update() error { return nil }
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func (system *GridSystem) Draw(screen *ebiten.Image) {
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op := &ebiten.DrawImageOptions{}
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query := system.Selector.Query(system.World)
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if !system.UseCache || query.Count() != system.Count {
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slog.Debug("entity number changes", "old", system.Count, "current", query.Count())
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// map not cached or cacheable, write it to the cache
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draw.Draw(system.Cache, system.Background.Bounds(), system.Background, image.ZP, draw.Src)
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system.Count = query.Count()
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for query.Next() {
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sprite, pos, _ := query.Get()
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//slog.Debug("drawing sprite", "sprite", sprite, "point", pos.Point())
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draw.Draw(
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system.Cache,
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image.Rect(pos.X, pos.Y, pos.X+pos.Cellsize, pos.Y+pos.Cellsize),
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sprite.Image, image.ZP, draw.Over)
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}
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op.GeoM.Reset()
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screen.DrawImage(system.Cache, op)
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system.UseCache = true
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} else {
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// use the cached map
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op.GeoM.Reset()
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screen.DrawImage(system.Cache, op)
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query.Close()
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}
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}
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