added --tps and --background

README.md

@@ -1,5 +1,7 @@
 # kage-viewer - Viewer for shaders written in Kage, similar to glslviewer
 
+![Logo](https://github.com/TLINDEN/kageviewer/blob/main/.github/assets/logo.png)
+
 [![License](https://img.shields.io/badge/license-GPL-blue.svg)](https://github.com/tlinden/kage-viewer/blob/master/LICENSE)
 [![Go Report Card](https://goreportcard.com/badge/github.com/tlinden/kage-viewer)](https://goreportcard.com/report/github.com/tlinden/kage-viewer) 
 
@@ -11,6 +13,10 @@ reloads changed assets, which allows you to develop your shader and
 see live, how it responds to your changes. If loading fails, an error
 will be printed to STDOUT. The same applies for images.
 
+## Screenshot
+
+![Screenshot](https://github.com/TLINDEN/kageviewer/blob/main/.github/assets/screenshot.png)
+
 ## Installation
 
 The tool does not have any dependencies.  Just download the binary for
@@ -72,6 +78,8 @@ Options:
 -s --shader     <kage file>     Shader to run
 -g --geometry   <WIDTHxHEIGHT>  Window size
 -p --position   <XxY>           Position of image0
+-b --background <png file>      Image to load as background
+-t --tps        <ticks/s>       At how many ticks per second to run
    --map-flag   <name>          Map Flag uniform to <name>
    --map-ticks  <name>          Map Flag uniform to <name>
    --map-slider <name>          Map Flag uniform to <name>

config.go

@@ -32,7 +32,7 @@ import (
 )
 
 const (
-	VERSION string = "0.0.3"
+	VERSION string = "0.0.4"
 	Usage   string = `This is kage-viewer, a shader viewer.
 
 Usage: kage-viewer [-vd] [-c <config file>] [-g geom] [-p geom] \
@@ -44,6 +44,8 @@ Options:
 -s --shader     <kage file>     Shader to run
 -g --geometry   <WIDTHxHEIGHT>  Window size
 -p --position   <XxY>           Position of image0
+-b --background <png file>      Image to load as background
+-t --tps        <ticks/s>       At how many ticks per second to run
    --map-flag   <name>          Map Flag uniform to <name>
    --map-ticks  <name>          Map Flag uniform to <name>
    --map-slider <name>          Map Flag uniform to <name>
@@ -59,6 +61,8 @@ type Config struct {
 	Config      string   `koanf:"config"`     // -c
 	Image       []string `koanf:"image"`      // -i
 	Shader      string   `koanf:"shader"`     // -s
+	Background  string   `koanf:"background"` // -b
+	TPS         int      `koanf:"tps"`        // -t
 	Geo         string   `koanf:"geometry"`   // -g
 	Posision    string   `koanf:"position"`   // -p
 	Flag        string   `koanf:"map-flag"`
@@ -91,6 +95,8 @@ func InitConfig() (*Config, error) {
 	flagset.StringP("map-ticks", "", "Ticks", "map ticks uniform")
 	flagset.StringP("map-mouse", "", "Mouse", "map mouse uniform")
 	flagset.StringP("map-slider", "", "Slider", "map slider uniform")
+	flagset.StringP("background", "b", "", "background image")
+	flagset.IntP("tps", "t", 60, "ticks per second")
 
 	if err := flagset.Parse(os.Args[1:]); err != nil {
 		return nil, fmt.Errorf("failed to parse program arguments: %w", err)

game.go

@@ -37,6 +37,7 @@ type Game struct {
 	Ticks      int
 	Slider     float64
 	Flag       int
+	Background *asset.LiveAsset[*ebiten.Image]
 }
 
 func LoadImage(name string) (*ebiten.Image, error) {
@@ -71,8 +72,21 @@ func (game *Game) Init() error {
 		return fmt.Errorf("failed to load shader %s: %s", game.Conf.Shader, err)
 	}
 
+	if game.Conf.Background != "" {
+		slog.Debug("Loading background", "image", game.Conf.Background)
+
+		img, err := asset.NewLiveAsset[*ebiten.Image](game.Conf.Background)
+		if err != nil {
+			return fmt.Errorf("failed to load image %s: %s", game.Conf.Background, err)
+		}
+
+		game.Background = img
+	}
+
 	game.Shader = shader
 
+	ebiten.SetMaxTPS(game.Conf.TPS)
+
 	return nil
 }
 
@@ -128,6 +142,12 @@ func (game *Game) Update() error {
 		fmt.Println("warn: shader reloading error:", game.Shader.Error())
 	}
 
+	if game.Background != nil {
+		if game.Background.Error() != nil {
+			fmt.Println("warn: background image reloading error:", game.Background.Error())
+		}
+	}
+
 	if game.CheckInput() {
 		slog.Debug("Key pressed",
 			game.Conf.Flag, game.Flag,
@@ -146,6 +166,11 @@ func (game *Game) Update() error {
 }
 
 func (game *Game) Draw(screen *ebiten.Image) {
+	if game.Background != nil {
+		op := &ebiten.DrawImageOptions{}
+		screen.DrawImage(game.Background.Value(), op)
+	}
+
 	op := &ebiten.DrawRectShaderOptions{}
 
 	op.Uniforms = map[string]any{