Delete drawer.go

drawer.go

@@ -1,102 +0,0 @@
-package pixel
-
-// Drawer glues all the fundamental interfaces (Target, Triangles, Picture) into a coherent and the
-// only intended usage pattern.
-//
-// Drawer makes it possible to draw any combination of Triangles and Picture onto any Target
-// efficiently.
-//
-// To create a Drawer, just assign it's Triangles and Picture fields:
-//
-//   d := pixel.Drawer{Triangles: t, Picture: p}
-//
-// If Triangles is nil, nothing will be drawn. If Picture is nil, Triangles will be drawn without a
-// Picture.
-//
-// Whenever you change the Triangles, call Dirty to notify Drawer that Triangles changed. You don't
-// need to notify Drawer about a change of the Picture.
-//
-// Note, that Drawer caches the results of MakePicture from Targets it's drawn to for each Picture
-// it's set to. What it means is that using a Drawer with an unbounded number of Pictures leads to a
-// memory leak, since Drawer caches them and never forgets. In such a situation, create a new Drawer
-// for each Picture.
-type Drawer struct {
-	Triangles Triangles
-	Picture   Picture
-	Cached    bool
-
-	targets    map[Target]*drawerTarget
-	allTargets []*drawerTarget
-	inited     bool
-}
-
-type drawerTarget struct {
-	tris  TargetTriangles
-	pics  map[Picture]TargetPicture
-	clean bool
-}
-
-func (d *Drawer) lazyInit() {
-	if !d.inited {
-		d.targets = make(map[Target]*drawerTarget)
-		d.inited = true
-	}
-}
-
-// Dirty marks the Triangles of this Drawer as changed. If not called, changes will not be visible
-// when drawing.
-func (d *Drawer) Dirty() {
-	d.lazyInit()
-
-	for _, t := range d.allTargets {
-		t.clean = false
-	}
-}
-
-// Draw efficiently draws Triangles with Picture onto the provided Target.
-//
-// If Triangles is nil, nothing will be drawn. If Picture is nil, Triangles will be drawn without a
-// Picture.
-func (d *Drawer) Draw(t Target) {
-	d.lazyInit()
-
-	if d.Triangles == nil {
-		return
-	}
-
-	dt := d.targets[t]
-	if dt == nil {
-		dt = &drawerTarget{
-			pics: make(map[Picture]TargetPicture),
-		}
-		d.targets[t] = dt
-		d.allTargets = append(d.allTargets, dt)
-	}
-
-	if dt.tris == nil {
-		dt.tris = t.MakeTriangles(d.Triangles)
-		dt.clean = true
-	}
-
-	if !dt.clean {
-		dt.tris.SetLen(d.Triangles.Len())
-		dt.tris.Update(d.Triangles)
-		dt.clean = true
-	}
-
-	if d.Picture == nil {
-		dt.tris.Draw()
-		return
-	}
-
-	pic := dt.pics[d.Picture]
-	if pic == nil {
-		pic = t.MakePicture(d.Picture)
-
-		if d.Cached {
-			dt.pics[d.Picture] = pic
-		}
-	}
-
-	pic.Draw(dt.tris)
-}