.go

package main

import (
	"image"
	"image/draw"
	"math/rand"

	"golang.org/x/image/colornames"

	"github.com/faiface/pixel"
	"github.com/faiface/pixel/pixelgl"
)

func run() {
	cfg := pixelgl.WindowConfig{
		Title:  "Batch Test",
		Bounds: pixel.R(0, 0, 1024, 768),
	}
	win, err := pixelgl.NewWindow(cfg)
	if err != nil {
		panic(err)
	}

	const n = 1e4

	img := image.NewRGBA(image.Rect(0, 0, 32, 32))
	draw.Draw(img, img.Bounds(), image.NewUniform(colornames.Red), image.ZP, draw.Src)
	pic := pixel.PictureDataFromImage(img)

	sprites := make([]*pixel.Sprite, n)
	matrices := make([]pixel.Matrix, n)
	for i := range sprites {
		sprites[i] = pixel.NewSprite(pic, pic.Bounds())
		matrices[i] = pixel.IM.Moved(pixel.V(
			rand.Float64()*win.Bounds().W(),
			rand.Float64()*win.Bounds().H(),
		))
	}

	batch := pixel.NewBatch(&pixel.TrianglesData{}, pic)

	for !win.Closed() {
		win.Clear(colornames.White)

		batch.Clear()
		for i := range sprites {
			sprites[i].Draw(batch, matrices[i])
		}
		batch.Draw(win)

		win.Update()
	}

}

func main() {
	pixelgl.Run(run)
}