gamnit: cache the last sprite added to `sprites_to_update`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/gamnit/flat.nit b/lib/gamnit/flat.nit
index f9710ab..85c702c 100644 (file)
--- a/lib/gamnit/flat.nit
+++ b/lib/gamnit/flat.nit
@@ -235,7 +235,10 @@ class Sprite
        fun needs_update
        do
                var c = context
-               if c != null then c.sprites_to_update.add self
+               if c == null then return
+               if c.last_sprite_to_update == self then return
+               c.sprites_to_update.add self
+               c.last_sprite_to_update = self
        end
 
        # Request a resorting of this sprite in its sprite list
@@ -696,6 +699,7 @@ private class SpriteSet
 
                context.sprites.add sprite
                context.sprites_to_update.add sprite
+               context.last_sprite_to_update = sprite
 
                sprite.context = context
                sprite.sprite_set = self
@@ -776,6 +780,9 @@ private class SpriteContext
        # Sprites to update since last `draw`
        var sprites_to_update = new Set[Sprite]
 
+       # Cache of the last `Sprite` added to `sprites_to_update` since the last call to `draw`
+       var last_sprite_to_update: nullable Sprite = null
+
        # Sprites that have been update and for which `needs_update` can be set to false
        var updated_sprites = new Array[Sprite]
 
@@ -1010,6 +1017,7 @@ private class SpriteContext
 
                        for sprite in sprites_to_update do update_sprite(sprite)
                        sprites_to_update.clear
+                       last_sprite_to_update = null
 
                        sys.perfs["gamnit flat gpu update"].add app.perf_clock_sprites.lapse
                end