// Copyright 2022 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//go:build ignore
// +build ignore

package main

import (
	"errors"

	"github.com/hajimehoshi/ebiten/v2"
)

var regularTermination = errors.New("regular termination")

type Game struct {
	count int
}

func (g *Game) Update() error {
	const shaderData = `
package main

func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
	return vec4(1)
}
`
	g.count++
	if g.count == 16 {
		return regularTermination
	}

	if g.count < 8 {
		go func() {
			s, err := ebiten.NewShader([]byte(shaderData))
			if err != nil {
				panic(err)
			}
			s.Dispose()
		}()
		return nil
	}

	return nil
}

func (g *Game) Draw(screen *ebiten.Image) {
}

func (g *Game) Layout(width, height int) (int, int) {
	return width, height
}

func main() {
	if err := ebiten.RunGame(&Game{}); err != nil && !errors.Is(err, regularTermination) {
		panic(err)
	}
}