From 8b2890cd4fd7c137b964b7a7d9e3d0b66e4e73f0 Mon Sep 17 00:00:00 2001
From: Luke Meyers <n.luke.meyers@gmail.com>
Date: Sat, 8 Feb 2020 19:25:36 -0800
Subject: [PATCH] batch bg

---
 gfx/gfx.go | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/gfx/gfx.go b/gfx/gfx.go
index 4acb255..9f2e713 100644
--- a/gfx/gfx.go
+++ b/gfx/gfx.go
@@ -65,7 +65,8 @@ func loadPicture(path string) (pixel.Picture, error) {
 }
 
 func Render(rs RenderState, sOld, sNew game.State, w *pixelgl.Window, sb spriteBank) RenderState {
-	renderBackground(w)
+	batch := pixel.NewBatch(new(pixel.TrianglesData), nil)
+	renderBackground(w, batch)
 
 	colors := teamColors(sNew.Teams)
 	ctx := context{
@@ -86,9 +87,11 @@ func Render(rs RenderState, sOld, sNew game.State, w *pixelgl.Window, sb spriteB
 
 var stars []pixel.Vec
 
-func renderBackground(w *pixelgl.Window) {
+func renderBackground(w *pixelgl.Window, batch *pixel.Batch) {
 	w.Clear(colornames.Black)
 
+	batch.Clear()
+
 	if len(stars) == 0 {
 		const numStars = 100
 		for i := 0; i < numStars; i++ {
@@ -106,7 +109,9 @@ func renderBackground(w *pixelgl.Window) {
 		im.Clear()
 	}
 	im.Circle(2, 0)
-	im.Draw(w)
+	im.Draw(batch)
+
+	batch.Draw(w)
 }
 
 func renderRacers(ctx context, colors map[*game.Team]pixel.RGBA, pic pixel.Picture) {