migrate to ebiten v2.0 API (#860)

* migrate to ebiten v2.0 API

* fixed lint errors

d2app/app.go

@@ -111,6 +111,10 @@ func Create(gitBranch, gitCommit string,
 	return result
 }
 
+func updateNOOP() error {
+	return nil
+}
+
 // Run executes the application and kicks off the entire game process
 func (a *App) Run() error {
 	profileOption := kingpin.Flag("profile", "Profiles the program, one of (cpu, mem, block, goroutine, trace, thread, mutex)").String()
@@ -126,7 +130,8 @@ func (a *App) Run() error {
 	windowTitle := fmt.Sprintf("OpenDiablo2 (%s)", a.gitBranch)
 	// If we fail to initialize, we will show the error screen
 	if err := a.initialize(); err != nil {
-		if gameErr := a.renderer.Run(updateInitError, 800, 600, windowTitle); gameErr != nil {
+		if gameErr := a.renderer.Run(updateInitError, updateNOOP, 800, 600,
+			windowTitle); gameErr != nil {
 			return gameErr
 		}
 
@@ -135,7 +140,7 @@ func (a *App) Run() error {
 
 	a.ToMainMenu()
 
-	if err := a.renderer.Run(a.update, 800, 600, windowTitle); err != nil {
+	if err := a.renderer.Run(a.update, a.advance, 800, 600, windowTitle); err != nil {
 		return err
 	}
 
@@ -212,9 +217,9 @@ func (a *App) loadStrings() error {
 	return nil
 }
 
-func (a *App) renderDebug(target d2interface.Surface) error {
+func (a *App) renderDebug(target d2interface.Surface) {
 	if !a.showFPS {
-		return nil
+		return
 	}
 
 	vsyncEnabled := a.renderer.GetVSyncEnabled()
@@ -241,8 +246,6 @@ func (a *App) renderDebug(target d2interface.Surface) error {
 	target.PushTranslation(0, debugLineHeight)
 	target.DrawTextf("Coords   " + strconv.FormatInt(int64(cx), 10) + "," + strconv.FormatInt(int64(cy), 10))
 	target.PopN(debugPopN)
-
-	return nil
 }
 
 func (a *App) renderCapture(target d2interface.Surface) error {
@@ -274,35 +277,33 @@ func (a *App) renderCapture(target d2interface.Surface) error {
 	return nil
 }
 
-func (a *App) render(target d2interface.Surface) error {
+func (a *App) render(target d2interface.Surface) {
-	if err := a.screen.Render(target); err != nil {
+	a.screen.Render(target)
-		return err
-	}
-
 	a.ui.Render(target)
 
 	if err := a.guiManager.Render(target); err != nil {
-		return err
+		return
 	}
 
-	if err := a.renderDebug(target); err != nil {
+	a.renderDebug(target)
-		return err
-	}
 
 	if err := a.renderCapture(target); err != nil {
-		return err
+		return
 	}
 
 	if err := a.terminal.Render(target); err != nil {
-		return err
+		return
 	}
-
-	return nil
 }
 
-func (a *App) advance(elapsed, elapsedUnscaled, current float64) error {
+func (a *App) advance() error {
-	elapsedLastScreenAdvance := (current - a.lastScreenAdvance) * a.timeScale
+	current := d2util.Now()
+	elapsedUnscaled := current - a.lastTime
+	elapsed := elapsedUnscaled * a.timeScale
 
+	a.lastTime = current
+
+	elapsedLastScreenAdvance := (current - a.lastScreenAdvance) * a.timeScale
 	a.lastScreenAdvance = current
 
 	if err := a.screen.Advance(elapsedLastScreenAdvance); err != nil {
@@ -327,18 +328,7 @@ func (a *App) advance(elapsed, elapsedUnscaled, current float64) error {
 }
 
 func (a *App) update(target d2interface.Surface) error {
-	currentTime := d2util.Now()
+	a.render(target)
-	elapsedTimeUnscaled := currentTime - a.lastTime
-	elapsedTime := elapsedTimeUnscaled * a.timeScale
-	a.lastTime = currentTime
-
-	if err := a.advance(elapsedTime, elapsedTimeUnscaled, currentTime); err != nil {
-		return err
-	}
-
-	if err := a.render(target); err != nil {
-		return err
-	}
 
 	if target.GetDepth() > 0 {
 		return errors.New("detected surface stack leak")
@@ -572,11 +562,7 @@ func enableProfiler(profileOption string) interface{ Stop() } {
 }
 
 func updateInitError(target d2interface.Surface) error {
-	err := target.Clear(colornames.Darkred)
+	target.Clear(colornames.Darkred)
-	if err != nil {
-		return err
-	}
-
 	target.PushTranslation(errMsgPadding, errMsgPadding)
 	target.DrawTextf(`Could not find the MPQ files in the directory: 
 		%s\nPlease put the files and re-run the game.`, d2config.Config.MpqPath)

d2common/d2interface/animation.go

@@ -9,13 +9,13 @@ import (
 
 // Animation is an animation
 type Animation interface {
-	BindRenderer(Renderer) error
+	BindRenderer(Renderer)
 	Clone() Animation
 	SetSubLoop(startFrame, EndFrame int)
 	Advance(elapsed float64) error
-	Render(target Surface) error
+	Render(target Surface)
-	RenderFromOrigin(target Surface, shadow bool) error
+	RenderFromOrigin(target Surface, shadow bool)
-	RenderSection(sfc Surface, bound image.Rectangle) error
+	RenderSection(sfc Surface, bound image.Rectangle)
 	GetFrameSize(frameIndex int) (int, int, error)
 	GetCurrentFrameSize() (int, int)
 	GetFrameBounds() (int, int)

d2common/d2interface/renderer.go

@@ -1,15 +1,17 @@
 package d2interface
 
-import "github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
+type renderCallback = func(Surface) error
+
+type updateCallback = func() error
 
 // Renderer interface defines the functionality of a renderer
 type Renderer interface {
 	GetRendererName() string
 	SetWindowIcon(fileName string)
-	Run(f func(Surface) error, width, height int, title string) error
+	Run(r renderCallback, u updateCallback, width, height int, title string) error
 	IsDrawingSkipped() bool
 	CreateSurface(surface Surface) (Surface, error)
-	NewSurface(width, height int, filter d2enum.Filter) (Surface, error)
+	NewSurface(width, height int) Surface
 	IsFullScreen() bool
 	SetFullScreen(fullScreen bool)
 	SetVSyncEnabled(vsync bool)

d2common/d2interface/surface.go

@@ -10,7 +10,7 @@ import (
 // Surface represents a renderable surface.
 type Surface interface {
 	Renderer() Renderer
-	Clear(color color.Color) error
+	Clear(color color.Color)
 	DrawRect(width, height int, color color.Color)
 	DrawLine(x, y int, color color.Color)
 	DrawTextf(format string, params ...interface{})
@@ -26,9 +26,9 @@ type Surface interface {
 	PushScale(x, y float64)
 	PushBrightness(brightness float64)
 	PushSaturation(saturation float64)
-	Render(surface Surface) error
+	Render(surface Surface)
 	// Renders a section of the surface enclosed by bounds
-	RenderSection(surface Surface, bound image.Rectangle) error
+	RenderSection(surface Surface, bound image.Rectangle)
-	ReplacePixels(pixels []byte) error
+	ReplacePixels(pixels []byte)
 	Screenshot() *image.RGBA
 }

d2common/d2util/debug_print.go

@@ -2,11 +2,10 @@ package d2util
 
 import (
 	"image"
-	"log"
 
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2util/assets"
 
-	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/v2"
 )
 
 const (
@@ -19,10 +18,7 @@ var DebugPrinter = NewDebugPrinter() //nolint:gochecknoglobals // currently glob
 
 // NewDebugPrinter creates a new debug printer
 func NewDebugPrinter() *GlyphPrinter {
-	img, err := ebiten.NewImageFromImage(assets.CreateTextImage(), ebiten.FilterDefault)
+	img := ebiten.NewImageFromImage(assets.CreateTextImage())
-	if err != nil {
-		return nil
-	}
 
 	printer := &GlyphPrinter{
 		glyphImageTable: img,
@@ -91,11 +87,7 @@ func (p *GlyphPrinter) drawDebugText(target *ebiten.Image, str string, ox, oy in
 		op.GeoM.Translate(float64(ox+1), float64(oy))
 
 		op.CompositeMode = ebiten.CompositeModeLighter
-		err := target.DrawImage(s, op)
+		target.DrawImage(s, op)
-
-		if err != nil {
-			log.Print(err)
-		}
 
 		x += cw
 	}

d2core/d2asset/animation.go

@@ -39,6 +39,9 @@ type animationDirection struct {
 	frames  []animationFrame
 }
 
+// static check that we implement the animation interface
+var _ d2interface.Animation = &Animation{}
+
 // Animation has directionality, play modes, and frame counting
 type Animation struct {
 	renderer         d2interface.Renderer
@@ -123,7 +126,7 @@ const (
 	zero = 0.0
 )
 
-func (a *Animation) renderShadow(target d2interface.Surface) error {
+func (a *Animation) renderShadow(target d2interface.Surface) {
 	direction := a.directions[a.directionIndex]
 	frame := direction.frames[a.frameIndex]
 
@@ -145,16 +148,13 @@ func (a *Animation) renderShadow(target d2interface.Surface) error {
 	target.PushBrightness(zero)
 	defer target.Pop()
 
-	return target.Render(frame.image)
+	target.Render(frame.image)
 }
 
 // Render renders the animation to the given surface
-func (a *Animation) Render(target d2interface.Surface) error {
+func (a *Animation) Render(target d2interface.Surface) {
 	if a.renderer == nil {
-		err := a.BindRenderer(target.Renderer())
+		a.BindRenderer(target.Renderer())
-		if err != nil {
-			return err
-		}
 	}
 
 	direction := a.directions[a.directionIndex]
@@ -169,26 +169,25 @@ func (a *Animation) Render(target d2interface.Surface) error {
 	target.PushColor(a.colorMod)
 	defer target.Pop()
 
-	return target.Render(frame.image)
+	target.Render(frame.image)
 }
 
 // BindRenderer binds the given renderer to the animation so that it can initialize
 // the required surfaces
-func (a *Animation) BindRenderer(r d2interface.Renderer) error {
+func (a *Animation) BindRenderer(r d2interface.Renderer) {
 	if a.onBindRenderer == nil {
-		return errors.New("the Animation does not have a onBindRenderer handler")
+		return
 	}
 
-	return a.onBindRenderer(r)
+	if err := a.onBindRenderer(r); err != nil {
+		log.Println(err)
+	}
 }
 
 // RenderFromOrigin renders the animation from the animation origin
-func (a *Animation) RenderFromOrigin(target d2interface.Surface, shadow bool) error {
+func (a *Animation) RenderFromOrigin(target d2interface.Surface, shadow bool) {
 	if a.renderer == nil {
-		err := a.BindRenderer(target.Renderer())
+		a.BindRenderer(target.Renderer())
-		if err != nil {
-			return err
-		}
 	}
 
 	if a.originAtBottom {
@@ -207,19 +206,18 @@ func (a *Animation) RenderFromOrigin(target d2interface.Surface, shadow bool) er
 		target.PushTranslation(-halfHeight, 0)
 		defer target.Pop()
 
-		return a.renderShadow(target)
+		a.renderShadow(target)
+
+		return
 	}
 
-	return a.Render(target)
+	a.Render(target)
 }
 
 // RenderSection renders the section of the animation frame enclosed by bounds
-func (a *Animation) RenderSection(target d2interface.Surface, bound image.Rectangle) error {
+func (a *Animation) RenderSection(target d2interface.Surface, bound image.Rectangle) {
 	if a.renderer == nil {
-		err := a.BindRenderer(target.Renderer())
+		a.BindRenderer(target.Renderer())
-		if err != nil {
-			return err
-		}
 	}
 
 	direction := a.directions[a.directionIndex]
@@ -234,7 +232,7 @@ func (a *Animation) RenderSection(target d2interface.Surface, bound image.Rectan
 	target.PushColor(a.colorMod)
 	defer target.Pop()
 
-	return target.RenderSection(frame.image, bound)
+	target.RenderSection(frame.image, bound)
 }
 
 // GetFrameSize gets the Size(width, height) of a indexed frame.
@@ -398,9 +396,9 @@ func (a *Animation) SetShadow(shadow bool) {
 }
 
 // Clone creates a copy of the Animation
-func (a *Animation) Clone() Animation {
+func (a *Animation) Clone() d2interface.Animation {
 	clone := *a
 	copy(clone.directions, a.directions)
 
-	return clone
+	return &clone
 }

d2core/d2asset/composite.go

@@ -70,18 +70,14 @@ func (c *Composite) Render(target d2interface.Surface) error {
 		layer := c.mode.layers[layerIndex]
 
 		if layer != nil {
-			if err := layer.RenderFromOrigin(target, true); err != nil {
+			layer.RenderFromOrigin(target, true)
-				return err
-			}
 		}
 	}
 
 	for _, layerIndex := range c.mode.cof.Priority[direction][c.mode.frameIndex] {
 		layer := c.mode.layers[layerIndex]
 		if layer != nil {
-			if err := layer.RenderFromOrigin(target, false); err != nil {
+			layer.RenderFromOrigin(target, false)
-				return err
-			}
 		}
 	}
 

d2core/d2asset/dc6_animation.go

@@ -24,7 +24,7 @@ func newDC6Animation(
 		palette: pal,
 	}
 
-	anim := Animation{
+	anim := &Animation{
 		playLength:     defaultPlayLength,
 		playLoop:       true,
 		originAtBottom: true,
@@ -39,7 +39,7 @@ func newDC6Animation(
 		},
 	}
 
-	DC6.Animation = anim
+	DC6.Animation = *anim
 
 	err := DC6.init()
 	if err != nil {
@@ -174,14 +174,9 @@ func (a *DC6Animation) createFrameSurface(directionIndex, frameIndex int) (d2int
 		return nil, errors.New("no renderer")
 	}
 
-	sfc, err := a.renderer.NewSurface(int(dc6Frame.Width), int(dc6Frame.Height), d2enum.FilterNearest)
+	sfc := a.renderer.NewSurface(int(dc6Frame.Width), int(dc6Frame.Height))
-	if err != nil {
-		return nil, err
-	}
 
-	if err := sfc.ReplacePixels(colorData); err != nil {
+	sfc.ReplacePixels(colorData)
-		return nil, err
-	}
 
 	return sfc, nil
 }
@@ -189,7 +184,7 @@ func (a *DC6Animation) createFrameSurface(directionIndex, frameIndex int) (d2int
 // Clone creates a copy of the animation
 func (a *DC6Animation) Clone() d2interface.Animation {
 	clone := &DC6Animation{}
-	clone.Animation = a.Animation.Clone()
+	clone.Animation = *a.Animation.Clone().(*Animation)
 	clone.dc6 = a.dc6.Clone()
 	clone.palette = a.palette
 

d2core/d2asset/dcc_animation.go

@@ -27,7 +27,7 @@ func newDCCAnimation(
 		palette: pal,
 	}
 
-	anim := Animation{
+	anim := &Animation{
 		playLength: defaultPlayLength,
 		playLoop:   true,
 		effect:     effect,
@@ -41,7 +41,7 @@ func newDCCAnimation(
 		},
 	}
 
-	DCC.Animation = anim
+	DCC.Animation = *anim
 
 	err := DCC.init()
 	if err != nil {
@@ -73,7 +73,7 @@ func (a *DCCAnimation) init() error {
 // Clone creates a copy of the animation
 func (a *DCCAnimation) Clone() d2interface.Animation {
 	clone := &DCCAnimation{}
-	clone.Animation = a.Animation.Clone()
+	clone.Animation = *a.Animation.Clone().(*Animation)
 	clone.dcc = a.dcc.Clone()
 	clone.palette = a.palette
 
@@ -207,14 +207,9 @@ func (a *DCCAnimation) createFrameSurface(directionIndex, frameIndex int) (d2int
 		return nil, errors.New("no renderer")
 	}
 
-	sfc, err := a.renderer.NewSurface(animFrame.width, animFrame.height, d2enum.FilterNearest)
+	sfc := a.renderer.NewSurface(animFrame.width, animFrame.height)
-	if err != nil {
-		return nil, err
-	}
 
-	if err := sfc.ReplacePixels(colorData); err != nil {
+	sfc.ReplacePixels(colorData)
-		return nil, err
-	}
 
 	return sfc, nil
 }

d2core/d2asset/font.go

@@ -60,11 +60,7 @@ func (f *Font) GetTextMetrics(text string) (width, height int) {
 // RenderText prints a text using its configured style on a Surface (multi-lines are left-aligned, use label otherwise)
 func (f *Font) RenderText(text string, target d2interface.Surface) error {
 	if f.glyphs == nil {
-		err := f.sheet.BindRenderer(target.Renderer())
+		f.sheet.BindRenderer(target.Renderer())
-		if err != nil {
-			return err
-		}
-
 		f.initGlyphs()
 	}
 
@@ -88,9 +84,7 @@ func (f *Font) RenderText(text string, target d2interface.Surface) error {
 				return err
 			}
 
-			if err := f.sheet.Render(target); err != nil {
+			f.sheet.Render(target)
-				return err
-			}
 
 			lineHeight = d2math.MaxInt(lineHeight, glyph.height)
 			lineLength++

d2core/d2audio/ebiten/ebiten_audio_provider.go

@@ -7,8 +7,8 @@ import (
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
 	"github.com/OpenDiablo2/OpenDiablo2/d2core/d2asset"
 
-	"github.com/hajimehoshi/ebiten/audio"
+	"github.com/hajimehoshi/ebiten/v2/audio"
-	"github.com/hajimehoshi/ebiten/audio/wav"
+	"github.com/hajimehoshi/ebiten/v2/audio/wav"
 )
 
 const sampleRate = 44100
@@ -16,20 +16,14 @@ const sampleRate = 44100
 var _ d2interface.AudioProvider = &AudioProvider{} // Static check to confirm struct conforms to interface
 
 // CreateAudio creates an instance of ebiten's audio provider
-func CreateAudio(am *d2asset.AssetManager) (*AudioProvider, error) {
+func CreateAudio(am *d2asset.AssetManager) *AudioProvider {
 	result := &AudioProvider{
 		asset: am,
 	}
 
-	var err error
+	result.audioContext = audio.NewContext(sampleRate)
-	result.audioContext, err = audio.NewContext(sampleRate)
 
-	if err != nil {
+	return result
-		log.Fatal(err)
-		return nil, err
-	}
-
-	return result, nil
 }
 
 // AudioProvider represents a provider capable of playing audio
@@ -51,10 +45,7 @@ func (eap *AudioProvider) PlayBGM(song string) {
 	eap.lastBgm = song
 
 	if song == "" && eap.bgmAudio != nil && eap.bgmAudio.IsPlaying() {
-		err := eap.bgmAudio.Pause()
+		eap.bgmAudio.Pause()
-		if err != nil {
-			log.Print(err)
-		}
 
 		return
 	}
@@ -95,11 +86,7 @@ func (eap *AudioProvider) PlayBGM(song string) {
 		panic(err)
 	}
 
-	err = eap.bgmAudio.Play()
+	eap.bgmAudio.Play()
-
-	if err != nil {
-		panic(err)
-	}
 }
 
 // LoadSound loads a sound affect so that it canb e played

d2core/d2audio/ebiten/ebiten_sound_effect.go

@@ -1,13 +1,14 @@
 package ebiten
 
 import (
+	"io"
 	"math"
 
-	"github.com/hajimehoshi/ebiten/audio"
+	"github.com/hajimehoshi/ebiten/v2/audio"
 )
 
 type panStream struct {
-	audio.ReadSeekCloser
+	io.ReadSeeker
 	pan float64 // -1: left; 0: center; 1: right
 }
 
@@ -15,15 +16,15 @@ const (
 	bitsPerByte = 8
 )
 
-func newPanStreamFromReader(src audio.ReadSeekCloser) *panStream {
+func newPanStreamFromReader(src io.ReadSeeker) *panStream {
 	return &panStream{
-		ReadSeekCloser: src,
+		ReadSeeker: src,
-		pan:            0,
+		pan:        0,
 	}
 }
 
 func (s *panStream) Read(p []byte) (n int, err error) {
-	n, err = s.ReadSeekCloser.Read(p)
+	n, err = s.ReadSeeker.Read(p)
 	if err != nil {
 		return
 	}
@@ -74,18 +75,10 @@ func (v *SoundEffect) Play() {
 		panic(err)
 	}
 
-	err = v.player.Play()
+	v.player.Play()
-
-	if err != nil {
-		panic(err)
-	}
 }
 
 // Stop stops the sound effect
 func (v *SoundEffect) Stop() {
-	err := v.player.Pause()
+	v.player.Pause()
-
-	if err != nil {
-		panic(err)
-	}
 }

d2core/d2gui/button.go

@@ -44,8 +44,8 @@ func (b *Button) onMouseLeave(_ d2interface.MouseMoveEvent) bool {
 	return false
 }
 
-func (b *Button) render(target d2interface.Surface) error {
+func (b *Button) render(target d2interface.Surface) {
-	return target.Render(b.surfaces[b.state])
+	target.Render(b.surfaces[b.state])
 }
 
 func (b *Button) getSize() (width, height int) {

d2core/d2gui/common.go

@@ -20,13 +20,9 @@ func renderSegmented(animation d2interface.Animation, segmentsX, segmentsY, fram
 			}
 
 			target.PushTranslation(x+currentX, y+currentY)
-			err := animation.Render(target)
+			animation.Render(target)
 			target.Pop()
 
-			if err != nil {
-				return err
-			}
-
 			width, height := animation.GetCurrentFrameSize()
 			maxHeight = d2math.MaxInt(maxHeight, height)
 			currentX += width

d2core/d2gui/gui_manager.go

@@ -91,29 +91,21 @@ func (m *GuiManager) OnMouseMove(event d2interface.MouseMoveEvent) bool {
 // Render renders the GuiManager to the given surface
 func (m *GuiManager) Render(target d2interface.Surface) error {
 	if m.loading {
-		if err := m.renderLoadScreen(target); err != nil {
+		m.renderLoadScreen(target)
-			return err
-		}
 	} else if m.layout != nil {
 		m.layout.SetSize(target.GetSize())
-		if err := m.layout.render(target); err != nil {
+		m.layout.render(target)
-			return err
-		}
 	}
 
 	if m.cursorVisible {
-		if err := m.renderCursor(target); err != nil {
+		m.renderCursor(target)
-			return err
-		}
 	}
 
 	return nil
 }
 
-func (m *GuiManager) renderLoadScreen(target d2interface.Surface) error {
+func (m *GuiManager) renderLoadScreen(target d2interface.Surface) {
-	if clearErr := target.Clear(color.Black); clearErr != nil {
+	target.Clear(color.Black)
-		return clearErr
-	}
 
 	pushCount := 0
 
@@ -128,10 +120,10 @@ func (m *GuiManager) renderLoadScreen(target d2interface.Surface) error {
 
 	defer target.PopN(pushCount)
 
-	return m.loadingAnim.Render(target)
+	m.loadingAnim.Render(target)
 }
 
-func (m *GuiManager) renderCursor(target d2interface.Surface) error {
+func (m *GuiManager) renderCursor(target d2interface.Surface) {
 	_, height := m.cursorAnim.GetCurrentFrameSize()
 	pushCount := 0
 
@@ -143,7 +135,7 @@ func (m *GuiManager) renderCursor(target d2interface.Surface) error {
 
 	defer target.PopN(pushCount)
 
-	return m.cursorAnim.Render(target)
+	m.cursorAnim.Render(target)
 }
 
 // Advance advances the GuiManager state

d2core/d2gui/label.go

@@ -3,7 +3,6 @@ package d2gui
 import (
 	"log"
 
-	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
 	"github.com/OpenDiablo2/OpenDiablo2/d2core/d2asset"
 )
@@ -35,8 +34,8 @@ func createLabel(renderer d2interface.Renderer, text string, font *d2asset.Font)
 	return label
 }
 
-func (l *Label) render(target d2interface.Surface) error {
+func (l *Label) render(target d2interface.Surface) {
-	return target.Render(l.surface)
+	target.Render(l.surface)
 }
 
 func (l *Label) getSize() (width, height int) {
@@ -60,10 +59,7 @@ func (l *Label) SetText(text string) error {
 func (l *Label) setText(text string) error {
 	width, height := l.font.GetTextMetrics(text)
 
-	surface, err := l.renderer.NewSurface(width, height, d2enum.FilterNearest)
+	surface := l.renderer.NewSurface(width, height)
-	if err != nil {
-		return err
-	}
 
 	if err := l.font.RenderText(text, surface); err != nil {
 		return err

d2core/d2gui/layout.go

@@ -3,7 +3,6 @@ package d2gui
 import (
 	"errors"
 
-	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2math"
 	"github.com/OpenDiablo2/OpenDiablo2/d2core/d2asset"
@@ -49,6 +48,9 @@ const (
 	PositionTypeHorizontal
 )
 
+// static check that Layout implements a widget
+var _ widget = &Layout{}
+
 // Layout is a gui element container which will automatically position/align gui elements.
 // Layouts are gui elements as well, so they can be nested in other layouts.
 type Layout struct {
@@ -179,7 +181,7 @@ func (l *Layout) Clear() {
 	l.entries = nil
 }
 
-func (l *Layout) render(target d2interface.Surface) error {
+func (l *Layout) render(target d2interface.Surface) {
 	l.AdjustEntryPlacement()
 
 	for _, entry := range l.entries {
@@ -187,18 +189,12 @@ func (l *Layout) render(target d2interface.Surface) error {
 			continue
 		}
 
-		if err := l.renderEntry(entry, target); err != nil {
+		l.renderEntry(entry, target)
-			return err
-		}
 
 		if layoutDebug {
-			if err := l.renderEntryDebug(entry, target); err != nil {
+			l.renderEntryDebug(entry, target)
-				return err
-			}
 		}
 	}
-
-	return nil
 }
 
 func (l *Layout) advance(elapsed float64) error {
@@ -211,14 +207,14 @@ func (l *Layout) advance(elapsed float64) error {
 	return nil
 }
 
-func (l *Layout) renderEntry(entry *layoutEntry, target d2interface.Surface) error {
+func (l *Layout) renderEntry(entry *layoutEntry, target d2interface.Surface) {
 	target.PushTranslation(entry.x, entry.y)
 	defer target.Pop()
 
-	return entry.widget.render(target)
+	entry.widget.render(target)
 }
 
-func (l *Layout) renderEntryDebug(entry *layoutEntry, target d2interface.Surface) error {
+func (l *Layout) renderEntryDebug(entry *layoutEntry, target d2interface.Surface) {
 	target.PushTranslation(entry.x, entry.y)
 	defer target.Pop()
 
@@ -244,8 +240,6 @@ func (l *Layout) renderEntryDebug(entry *layoutEntry, target d2interface.Surface
 	target.PushTranslation(0, entry.height)
 	target.DrawLine(entry.width, 0, drawColor)
 	target.Pop()
-
-	return nil
 }
 
 func (l *Layout) getContentSize() (width, height int) {
@@ -471,10 +465,7 @@ func (l *Layout) createButton(renderer d2interface.Renderer, text string,
 	surfaces := make([]d2interface.Surface, surfaceCount)
 
 	for i := 0; i < surfaceCount; i++ {
-		surface, surfaceErr := renderer.NewSurface(buttonWidth, buttonHeight, d2enum.FilterNearest)
+		surface := renderer.NewSurface(buttonWidth, buttonHeight)
-		if surfaceErr != nil {
-			return nil, surfaceErr
-		}
 
 		segX, segY, frame := config.segmentsX, config.segmentsY, i
 		if segErr := renderSegmented(animation, segX, segY, frame, surface); segErr != nil {
@@ -492,7 +483,7 @@ func (l *Layout) createButton(renderer d2interface.Renderer, text string,
 		}
 
 		surface.PushTranslation(textX+textOffsetX, textY+textOffsetY)
-		surfaceErr = font.RenderText(text, surface)
+		surfaceErr := font.RenderText(text, surface)
 		surface.Pop()
 
 		if surfaceErr != nil {

d2core/d2gui/sprite.go

@@ -1,6 +1,8 @@
 package d2gui
 
 import (
+	"log"
+
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
 	"github.com/OpenDiablo2/OpenDiablo2/d2core/d2asset"
@@ -15,6 +17,9 @@ const (
 	DirectionBackward
 )
 
+// static check that Sprite implements widget
+var _ widget = &Sprite{}
+
 // Sprite is an image
 type Sprite struct {
 	widgetBase
@@ -67,13 +72,13 @@ func createAnimatedSprite(
 	return sprite, nil
 }
 
-func (s *AnimatedSprite) render(target d2interface.Surface) error {
+func (s *AnimatedSprite) render(target d2interface.Surface) {
 	_, frameHeight := s.animation.GetCurrentFrameSize()
 
 	target.PushTranslation(s.x, s.y-frameHeight)
 	defer target.Pop()
 
-	return s.animation.Render(target)
+	s.animation.Render(target)
 }
 
 // SetSegmented sets the segment properties of the sprite
@@ -83,8 +88,11 @@ func (s *Sprite) SetSegmented(segmentsX, segmentsY, frameOffset int) {
 	s.frameOffset = frameOffset
 }
 
-func (s *Sprite) render(target d2interface.Surface) error {
+func (s *Sprite) render(target d2interface.Surface) {
-	return renderSegmented(s.animation, s.segmentsX, s.segmentsY, s.frameOffset, target)
+	err := renderSegmented(s.animation, s.segmentsX, s.segmentsY, s.frameOffset, target)
+	if err != nil {
+		log.Println(err)
+	}
 }
 
 func (s *Sprite) advance(elapsed float64) error {

d2core/d2gui/widget.go

@@ -11,7 +11,7 @@ type MouseHandler func(d2interface.MouseEvent)
 type MouseMoveHandler func(d2interface.MouseMoveEvent)
 
 type widget interface {
-	render(target d2interface.Surface) error
+	render(target d2interface.Surface)
 	advance(elapsed float64) error
 
 	onMouseMove(event d2interface.MouseMoveEvent) bool
@@ -130,9 +130,7 @@ func (w *widgetBase) isExpanding() bool {
 	return w.expanding
 }
 
-func (w *widgetBase) render(_ d2interface.Surface) error {
+func (w *widgetBase) render(_ d2interface.Surface) { /* NOOP */ }
-	return nil
-}
 
 func (w *widgetBase) advance(_ float64) error {
 	return nil

d2core/d2input/ebiten/ebiten_input.go

@@ -2,8 +2,8 @@
 package ebiten
 
 import (
-	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/v2"
-	"github.com/hajimehoshi/ebiten/inpututil"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
 
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 )

d2core/d2map/d2mapentity/animated_entity.go

@@ -50,9 +50,7 @@ func (ae *AnimatedEntity) Render(target d2interface.Surface) {
 		ae.highlight = false
 	}
 
-	if err := ae.animation.Render(target); err != nil {
+	ae.animation.Render(target)
-		fmt.Printf("failed to render animated entity, err: %v\n", err)
-	}
 }
 
 // GetDirection returns the current facing direction of this entity.

d2core/d2map/d2maprenderer/renderer.go

@@ -373,9 +373,7 @@ func (mr *MapRenderer) renderFloor(tile d2ds1.FloorShadowRecord, target d2interf
 	target.PushTranslation(mr.viewport.GetTranslationScreen())
 	defer target.Pop()
 
-	if err := target.Render(img); err != nil {
+	target.Render(img)
-		fmt.Printf("failed to render the floor, err: %v\n", err)
-	}
 }
 
 func (mr *MapRenderer) renderWall(tile d2ds1.WallRecord, viewport *Viewport, target d2interface.Surface) {
@@ -391,9 +389,7 @@ func (mr *MapRenderer) renderWall(tile d2ds1.WallRecord, viewport *Viewport, tar
 	target.PushTranslation(viewport.GetTranslationScreen())
 	defer target.Pop()
 
-	if err := target.Render(img); err != nil {
+	target.Render(img)
-		fmt.Printf("failed to render the wall, err: %v\n", err)
-	}
 }
 
 func (mr *MapRenderer) renderShadow(tile d2ds1.FloorShadowRecord, target d2interface.Surface) {
@@ -411,9 +407,7 @@ func (mr *MapRenderer) renderShadow(tile d2ds1.FloorShadowRecord, target d2inter
 	target.PushColor(color.RGBA{R: 255, G: 255, B: 255, A: 160}) //nolint:gomnd // Not a magic number...
 	defer target.Pop()
 
-	if err := target.Render(img); err != nil {
+	target.Render(img)
-		fmt.Printf("failed to render the shadow, err: %v\n", err)
-	}
 }
 
 func (mr *MapRenderer) renderMapDebug(mapDebugVisLevel int, target d2interface.Surface, startX, startY, endX, endY int) {

d2core/d2map/d2maprenderer/tile_cache.go

@@ -100,20 +100,13 @@ func (mr *MapRenderer) generateFloorCache(tile *d2ds1.FloorShadowRecord) {
 
 		tileYOffset := d2math.AbsInt32(tileYMinimum)
 		tileHeight := d2math.AbsInt32(tileData[i].Height)
-		image, err := mr.renderer.NewSurface(int(tileData[i].Width), int(tileHeight), d2enum.FilterNearest)
+		image := mr.renderer.NewSurface(int(tileData[i].Width), int(tileHeight))
-
-		if err != nil {
-			log.Print(err)
-		}
 
 		indexData := make([]byte, tileData[i].Width*tileHeight)
 		d2dt1.DecodeTileGfxData(tileData[i].Blocks, &indexData, tileYOffset, tileData[i].Width)
 		pixels := d2util.ImgIndexToRGBA(indexData, mr.palette)
 
-		err = image.ReplacePixels(pixels)
+		image.ReplacePixels(pixels)
-		if err != nil {
-			log.Print(err)
-		}
 
 		mr.setImageCacheRecord(tile.Style, tile.Sequence, 0, tileIndex, image)
 	}
@@ -151,19 +144,13 @@ func (mr *MapRenderer) generateShadowCache(tile *d2ds1.FloorShadowRecord) {
 		return
 	}
 
-	image, err := mr.renderer.NewSurface(int(tileData.Width), tileHeight, d2enum.FilterNearest)
+	image := mr.renderer.NewSurface(int(tileData.Width), tileHeight)
-	if err != nil {
-		log.Print(err)
-	}
 
 	indexData := make([]byte, tileData.Width*int32(tileHeight))
 	d2dt1.DecodeTileGfxData(tileData.Blocks, &indexData, tileYOffset, tileData.Width)
 	pixels := d2util.ImgIndexToRGBA(indexData, mr.palette)
 
-	err = image.ReplacePixels(pixels)
+	image.ReplacePixels(pixels)
-	if err != nil {
-		log.Print(err)
-	}
 
 	mr.setImageCacheRecord(tile.Style, tile.Sequence, d2enum.TileShadow, tile.RandomIndex, image)
 }
@@ -222,10 +209,7 @@ func (mr *MapRenderer) generateWallCache(tile *d2ds1.WallRecord) {
 		return
 	}
 
-	image, err := mr.renderer.NewSurface(tileSurfaceWidth, int(realHeight), d2enum.FilterNearest)
+	image := mr.renderer.NewSurface(tileSurfaceWidth, int(realHeight))
-	if err != nil {
-		log.Print(err)
-	}
 
 	indexData := make([]byte, tileSurfaceWidth*realHeight)
 
@@ -237,9 +221,7 @@ func (mr *MapRenderer) generateWallCache(tile *d2ds1.WallRecord) {
 
 	pixels := d2util.ImgIndexToRGBA(indexData, mr.palette)
 
-	if err := image.ReplacePixels(pixels); err != nil {
+	image.ReplacePixels(pixels)
-		log.Panicf(err.Error())
-	}
 
 	mr.setImageCacheRecord(tile.Style, tile.Sequence, tile.Type, tile.RandomIndex, image)
 }

d2core/d2render/ebiten/ebiten_renderer.go

@@ -1,10 +1,11 @@
 package ebiten
 
 import (
+	"errors"
 	"image"
 
-	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/v2"
-	"github.com/hajimehoshi/ebiten/ebitenutil"
+	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
 
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
@@ -22,19 +23,41 @@ const (
 	defaultScaleY     = 1.0
 )
 
+type renderCallback = func(surface d2interface.Surface) error
+
+type updateCallback = func() error
+
+// static check that we implement our renderer interface
+var _ d2interface.Renderer = &Renderer{}
+
 // Renderer is an implementation of a renderer
 type Renderer struct {
-	renderCallback func(surface d2interface.Surface) error
+	updateCallback
+	renderCallback
+	lastRenderError error
 }
 
-// Update updates the screen with the given *ebiten.Image
+// Update calls the game's logical update function (the `Advance` method)
-func (r *Renderer) Update(screen *ebiten.Image) error {
+func (r *Renderer) Update() error {
-	err := r.renderCallback(createEbitenSurface(r, screen))
+	if r.updateCallback == nil {
-	if err != nil {
+		return errors.New("no update callback defined for ebiten renderer")
-		return err
 	}
 
-	return nil
+	return r.updateCallback()
+}
+
+const drawError = "no render callback defined for ebiten renderer"
+
+// Draw updates the screen with the given *ebiten.Image
+func (r *Renderer) Draw(screen *ebiten.Image) {
+	r.lastRenderError = nil
+
+	if r.renderCallback == nil {
+		r.lastRenderError = errors.New(drawError)
+		return
+	}
+
+	r.lastRenderError = r.renderCallback(createEbitenSurface(r, screen))
 }
 
 // Layout returns the renderer screen width and height
@@ -64,7 +87,7 @@ func (*Renderer) GetRendererName() string {
 
 // SetWindowIcon sets the icon for the window, visible in the chrome of the window
 func (*Renderer) SetWindowIcon(fileName string) {
-	_, iconImage, err := ebitenutil.NewImageFromFile(fileName, ebiten.FilterLinear)
+	_, iconImage, err := ebitenutil.NewImageFromFile(fileName)
 	if err == nil {
 		ebiten.SetWindowIcon([]image.Image{iconImage})
 	}
@@ -72,12 +95,13 @@ func (*Renderer) SetWindowIcon(fileName string) {
 
 // IsDrawingSkipped returns a bool for whether or not the drawing has been skipped
 func (r *Renderer) IsDrawingSkipped() bool {
-	return ebiten.IsDrawingSkipped()
+	return r.lastRenderError != nil
 }
 
 // Run initializes the renderer
-func (r *Renderer) Run(f func(surface d2interface.Surface) error, width, height int, title string) error {
+func (r *Renderer) Run(f renderCallback, u updateCallback, width, height int, title string) error {
 	r.renderCallback = f
+	r.updateCallback = u
 
 	ebiten.SetWindowTitle(title)
 	ebiten.SetWindowResizable(true)
@@ -105,15 +129,10 @@ func (r *Renderer) CreateSurface(surface d2interface.Surface) (d2interface.Surfa
 }
 
 // NewSurface creates a new surface
-func (r *Renderer) NewSurface(width, height int, filter d2enum.Filter) (d2interface.Surface, error) {
+func (r *Renderer) NewSurface(width, height int) d2interface.Surface {
-	ebitenFilter := d2ToEbitenFilter(filter)
+	img := ebiten.NewImage(width, height)
-	img, err := ebiten.NewImage(width, height, ebitenFilter)
 
-	if err != nil {
+	return createEbitenSurface(r, img)
-		return nil, err
-	}
-
-	return createEbitenSurface(r, img), nil
 }
 
 // IsFullScreen returns a boolean for whether or not the renderer is currently set to fullscreen

d2core/d2render/ebiten/ebiten_surface.go

@@ -6,14 +6,17 @@ import (
 	"image/color"
 	"math"
 
-	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/v2"
-	"github.com/hajimehoshi/ebiten/ebitenutil"
+	"github.com/hajimehoshi/ebiten/v2/ebitenutil"
 
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2util"
 )
 
+// static check that we implement our interface
+var _ d2interface.Surface = &ebitenSurface{}
+
 const (
 	maxAlpha       = 0xff
 	cacheLimit     = 512
@@ -135,7 +138,7 @@ func (s *ebitenSurface) PopN(n int) {
 }
 
 // Render renders the given surface
-func (s *ebitenSurface) Render(sfc d2interface.Surface) error {
+func (s *ebitenSurface) Render(sfc d2interface.Surface) {
 	opts := s.createDrawImageOptions()
 
 	if s.stateCurrent.brightness != 1 || s.stateCurrent.saturation != 1 {
@@ -144,11 +147,11 @@ func (s *ebitenSurface) Render(sfc d2interface.Surface) error {
 
 	s.handleStateEffect(opts)
 
-	return s.image.DrawImage(sfc.(*ebitenSurface).image, opts)
+	s.image.DrawImage(sfc.(*ebitenSurface).image, opts)
 }
 
 // Renders the section of the surface, given the bounds
-func (s *ebitenSurface) RenderSection(sfc d2interface.Surface, bound image.Rectangle) error {
+func (s *ebitenSurface) RenderSection(sfc d2interface.Surface, bound image.Rectangle) {
 	opts := s.createDrawImageOptions()
 
 	if s.stateCurrent.brightness != 0 {
@@ -157,7 +160,7 @@ func (s *ebitenSurface) RenderSection(sfc d2interface.Surface, bound image.Recta
 
 	s.handleStateEffect(opts)
 
-	return s.image.DrawImage(sfc.(*ebitenSurface).image.SubImage(bound).(*ebiten.Image), opts)
+	s.image.DrawImage(sfc.(*ebitenSurface).image.SubImage(bound).(*ebiten.Image), opts)
 }
 
 func (s *ebitenSurface) createDrawImageOptions() *ebiten.DrawImageOptions {
@@ -233,8 +236,8 @@ func (s *ebitenSurface) DrawRect(width, height int, fillColor color.Color) {
 }
 
 // Clear clears the entire surface, filling with the given color
-func (s *ebitenSurface) Clear(fillColor color.Color) error {
+func (s *ebitenSurface) Clear(fillColor color.Color) {
-	return s.image.Fill(fillColor)
+	s.image.Fill(fillColor)
 }
 
 // GetSize gets the size of the surface
@@ -248,8 +251,8 @@ func (s *ebitenSurface) GetDepth() int {
 }
 
 // ReplacePixels replaces pixels in the surface with the given pixels
-func (s *ebitenSurface) ReplacePixels(pixels []byte) error {
+func (s *ebitenSurface) ReplacePixels(pixels []byte) {
-	return s.image.ReplacePixels(pixels)
+	s.image.ReplacePixels(pixels)
 }
 
 // Screenshot returns an *image.RGBA of the surface

d2core/d2render/ebiten/filter_helper.go

@@ -1,22 +1,18 @@
 package ebiten
 
 import (
-	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/v2"
 
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 )
 
 func d2ToEbitenFilter(filter d2enum.Filter) ebiten.Filter {
 	switch filter {
-	case d2enum.FilterDefault:
-		return ebiten.FilterDefault
-	case d2enum.FilterLinear:
-		return ebiten.FilterLinear
 	case d2enum.FilterNearest:
 		return ebiten.FilterNearest
+	default:
+		return ebiten.FilterLinear
 	}
-
-	return ebiten.FilterDefault
 }
 
 // func ebitenToD2Filter(filter ebiten.Filter) d2enum.Filter {

d2core/d2render/ebiten/surface_state.go

@@ -3,7 +3,7 @@ package ebiten
 import (
 	"image/color"
 
-	"github.com/hajimehoshi/ebiten"
+	"github.com/hajimehoshi/ebiten/v2"
 
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 )

d2core/d2screen/d2screen.go

@@ -22,7 +22,7 @@ type ScreenUnloadHandler interface {
 
 // ScreenRenderHandler is an exported interface
 type ScreenRenderHandler interface {
-	Render(target d2interface.Surface) error
+	Render(target d2interface.Surface)
 }
 
 // ScreenAdvanceHandler is an exported interface

d2core/d2screen/screen_manager.go

@@ -93,12 +93,8 @@ func (sm *ScreenManager) Advance(elapsed float64) error {
 }
 
 // Render renders the UI by a given surface
-func (sm *ScreenManager) Render(surface d2interface.Surface) error {
+func (sm *ScreenManager) Render(surface d2interface.Surface) {
 	if handler, ok := sm.currentScreen.(ScreenRenderHandler); ok {
-		if err := handler.Render(surface); err != nil {
+		handler.Render(surface)
-			return err
-		}
 	}
-
-	return nil
 }

d2core/d2ui/button.go

@@ -312,11 +312,7 @@ func (ui *UIManager) NewButton(buttonType ButtonType, text string) *Button {
 		}
 	}
 
-	btn.normalSurface, err = ui.renderer.NewSurface(btn.width, btn.height, d2enum.FilterNearest)
+	btn.normalSurface = ui.renderer.NewSurface(btn.width, btn.height)
-	if err != nil {
-		log.Print(err)
-		return nil
-	}
 
 	buttonSprite.SetPosition(0, 0)
 	buttonSprite.SetEffect(d2enum.DrawEffectModulate)
@@ -336,13 +332,12 @@ type buttonStateDescriptor struct {
 }
 
 func (v *Button) prerenderStates(btnSprite *Sprite, btnLayout *ButtonLayout, label *Label) {
-	var err error
-
 	numButtonStates := btnSprite.GetFrameCount() / (btnLayout.XSegments * btnLayout.YSegments)
 
 	// buttons always have a base image
 	if v.buttonLayout.HasImage {
-		err = btnSprite.RenderSegmented(v.normalSurface, btnLayout.XSegments, btnLayout.YSegments, btnLayout.BaseFrame)
+		err := btnSprite.RenderSegmented(v.normalSurface, btnLayout.XSegments,
+			btnLayout.YSegments, btnLayout.BaseFrame)
 		if err != nil {
 			fmt.Printf("failed to render button normalSurface, err: %v\n", err)
 		}
@@ -364,7 +359,7 @@ func (v *Button) prerenderStates(btnSprite *Sprite, btnLayout *ButtonLayout, lab
 	buttonStateConfigs := make([]*buttonStateDescriptor, 0)
 
 	// pressed button
-	if numButtonStates >= buttonStatePressed {
+	if numButtonStates > buttonStatePressed {
 		state := &buttonStateDescriptor{
 			baseFrame + buttonStatePressed,
 			xOffset - pressedButtonOffset, textY + pressedButtonOffset,
@@ -376,7 +371,7 @@ func (v *Button) prerenderStates(btnSprite *Sprite, btnLayout *ButtonLayout, lab
 	}
 
 	// toggle button
-	if numButtonStates >= buttonStateToggled {
+	if numButtonStates > buttonStateToggled {
 		buttonStateConfigs = append(buttonStateConfigs, &buttonStateDescriptor{
 			baseFrame + buttonStateToggled,
 			xOffset, textY,
@@ -386,7 +381,7 @@ func (v *Button) prerenderStates(btnSprite *Sprite, btnLayout *ButtonLayout, lab
 	}
 
 	// pressed+toggled
-	if numButtonStates >= buttonStatePressedToggled {
+	if numButtonStates > buttonStatePressedToggled {
 		buttonStateConfigs = append(buttonStateConfigs, &buttonStateDescriptor{
 			baseFrame + buttonStatePressedToggled,
 			xOffset, textY,
@@ -410,21 +405,18 @@ func (v *Button) prerenderStates(btnSprite *Sprite, btnLayout *ButtonLayout, lab
 	for stateIdx, w, h := 0, v.width, v.height; stateIdx < len(buttonStateConfigs); stateIdx++ {
 		state := buttonStateConfigs[stateIdx]
 
-		if stateIdx >= 2 && btnLayout.ResourceName == d2resource.BuySellButton {
+		if stateIdx > 1 && btnLayout.ResourceName == d2resource.BuySellButton {
 			// Without returning early, the button UI gets all subsequent (unrelated) frames
 			// stacked on top. Only 2 frames from this sprite are applicable to the button
 			// in question. The presentation is incorrect without this hack!
 			continue
 		}
 
-		surface, err := v.manager.renderer.NewSurface(w, h, d2enum.FilterNearest)
+		surface := v.manager.renderer.NewSurface(w, h)
-		if err != nil {
-			log.Print(err)
-		}
 
 		*state.prerenderdestination = surface
 
-		err = btnSprite.RenderSegmented(*state.prerenderdestination, xSeg, ySeg, state.baseFrame)
+		err := btnSprite.RenderSegmented(*state.prerenderdestination, xSeg, ySeg, state.baseFrame)
 		if err != nil {
 			fmt.Printf(state.fmtErr, err)
 		}
@@ -461,29 +453,23 @@ func (v *Button) Render(target d2interface.Surface) error {
 	target.PushTranslation(v.x, v.y)
 	defer target.Pop()
 
-	var err error
-
 	switch {
 	case !v.enabled:
 		target.PushColor(d2util.Color(lightGreyAlpha75))
 		defer target.Pop()
-		err = target.Render(v.disabledSurface)
+		target.Render(v.disabledSurface)
 	case v.toggled && v.pressed:
-		err = target.Render(v.pressedToggledSurface)
+		target.Render(v.pressedToggledSurface)
 	case v.pressed:
 		if v.buttonLayout.AllowFrameChange {
-			err = target.Render(v.pressedSurface)
+			target.Render(v.pressedSurface)
 		} else {
-			err = target.Render(v.normalSurface)
+			target.Render(v.normalSurface)
 		}
 	case v.toggled:
-		err = target.Render(v.toggledSurface)
+		target.Render(v.toggledSurface)
 	default:
-		err = target.Render(v.normalSurface)
+		target.Render(v.normalSurface)
-	}
-
-	if err != nil {
-		fmt.Printf("failed to render button surface, err: %v\n", err)
 	}
 
 	return nil

d2core/d2ui/checkbox.go

@@ -49,11 +49,7 @@ func (ui *UIManager) NewCheckbox(checkState bool) *Checkbox {
 
 	checkboxSprite.SetPosition(0, 0)
 
-	result.Image, err = ui.renderer.NewSurface(result.width, result.height, d2enum.FilterNearest)
+	result.Image = ui.renderer.NewSurface(result.width, result.height)
-	if err != nil {
-		log.Print(err)
-		return nil
-	}
 
 	err = checkboxSprite.RenderSegmented(result.Image, 1, 1, 0)
 	if err != nil {
@@ -61,11 +57,7 @@ func (ui *UIManager) NewCheckbox(checkState bool) *Checkbox {
 		return nil
 	}
 
-	result.checkedImage, err = ui.renderer.NewSurface(result.width, result.height, d2enum.FilterNearest)
+	result.checkedImage = ui.renderer.NewSurface(result.width, result.height)
-	if err != nil {
-		log.Print(err)
-		return nil
-	}
 
 	err = checkboxSprite.RenderSegmented(result.checkedImage, 1, 1, 1)
 	if err != nil {
@@ -85,8 +77,6 @@ func (v *Checkbox) bindManager(manager *UIManager) {
 
 // Render renders the checkbox
 func (v *Checkbox) Render(target d2interface.Surface) error {
-	var err error
-
 	target.PushTranslation(v.x, v.y)
 	defer target.Pop()
 
@@ -94,15 +84,9 @@ func (v *Checkbox) Render(target d2interface.Surface) error {
 	defer target.Pop()
 
 	if v.checkState {
-		err = target.Render(v.checkedImage)
+		target.Render(v.checkedImage)
-		if err != nil {
-			return err
-		}
 	} else {
-		err = target.Render(v.Image)
+		target.Render(v.Image)
-		if err != nil {
-			return err
-		}
 	}
 
 	return nil

d2core/d2ui/frame.go

@@ -225,9 +225,7 @@ func (u *UIFrame) renderFramePiece(sfc d2interface.Surface, x, y, idx int) error
 
 	u.frame.SetPosition(x, y)
 
-	if err := u.frame.Render(sfc); err != nil {
+	u.frame.Render(sfc)
-		return err
-	}
 
 	return nil
 }

d2core/d2ui/sprite.go

@@ -29,30 +29,27 @@ func (ui *UIManager) NewSprite(animationPath, palettePath string) (*Sprite, erro
 		return nil, fmt.Errorf(errNoAnimation)
 	}
 
-	err = animation.BindRenderer(ui.renderer)
+	animation.BindRenderer(ui.renderer)
-	if err != nil {
-		return nil, err
-	}
 
 	return &Sprite{animation: animation}, nil
 }
 
 // Render renders the sprite on the given surface
-func (s *Sprite) Render(target d2interface.Surface) error {
+func (s *Sprite) Render(target d2interface.Surface) {
 	_, frameHeight := s.animation.GetCurrentFrameSize()
 
 	target.PushTranslation(s.x, s.y-frameHeight)
 	defer target.Pop()
 
-	return s.animation.Render(target)
+	s.animation.Render(target)
 }
 
 // RenderSection renders the section of the sprite enclosed by bounds
-func (s *Sprite) RenderSection(sfc d2interface.Surface, bound image.Rectangle) error {
+func (s *Sprite) RenderSection(sfc d2interface.Surface, bound image.Rectangle) {
 	sfc.PushTranslation(s.x, s.y-bound.Dy())
 	defer sfc.Pop()
 
-	return s.animation.RenderSection(sfc, bound)
+	s.animation.RenderSection(sfc, bound)
 }
 
 // RenderSegmented renders a sprite that is internally segmented as frames
@@ -69,13 +66,9 @@ func (s *Sprite) RenderSegmented(target d2interface.Surface, segmentsX, segments
 			}
 
 			target.PushTranslation(s.x+currentX, s.y+currentY)
-			err := s.animation.Render(target)
+			s.animation.Render(target)
 			target.Pop()
 
-			if err != nil {
-				return err
-			}
-
 			frameWidth, frameHeight := s.GetCurrentFrameSize()
 			maxFrameHeight = d2math.MaxInt(maxFrameHeight, frameHeight)
 			currentX += frameWidth

d2core/d2ui/textbox.go

@@ -59,10 +59,7 @@ func (v *TextBox) Render(target d2interface.Surface) error {
 		return nil
 	}
 
-	if err := v.bgSprite.Render(target); err != nil {
+	v.bgSprite.Render(target)
-		return err
-	}
-
 	v.textLabel.Render(target)
 
 	if (time.Now().UnixNano()/1e6)&(1<<8) > 0 {

d2game/d2gamescreen/character_select.go

@@ -360,9 +360,9 @@ func (v *CharacterSelect) onExitButtonClicked() {
 }
 
 // Render renders the Character Select screen
-func (v *CharacterSelect) Render(screen d2interface.Surface) error {
+func (v *CharacterSelect) Render(screen d2interface.Surface) {
 	if err := v.background.RenderSegmented(screen, 4, 3, 0); err != nil {
-		return err
+		return
 	}
 
 	v.d2HeroTitle.Render(screen)
@@ -370,7 +370,7 @@ func (v *CharacterSelect) Render(screen d2interface.Surface) error {
 
 	if v.selectedCharacter > -1 && actualSelectionIndex >= 0 && actualSelectionIndex < 8 {
 		if err := v.selectionBox.RenderSegmented(screen, 2, 1, 0); err != nil {
-			return err
+			return
 		}
 	}
 
@@ -395,13 +395,11 @@ func (v *CharacterSelect) Render(screen d2interface.Surface) error {
 		screen.DrawRect(screenWidth, screenHeight, rgbaColor(blackHalfOpacity))
 
 		if err := v.okCancelBox.RenderSegmented(screen, 2, 1, 0); err != nil {
-			return err
+			return
 		}
 
 		v.deleteCharConfirmLabel.Render(screen)
 	}
-
-	return nil
 }
 
 func (v *CharacterSelect) moveSelectionBox() {

d2game/d2gamescreen/credits.go

@@ -128,10 +128,10 @@ func (v *Credits) OnLoad(loading d2screen.LoadingState) {
 }
 
 // Render renders the credits screen
-func (v *Credits) Render(screen d2interface.Surface) error {
+func (v *Credits) Render(screen d2interface.Surface) {
 	err := v.creditsBackground.RenderSegmented(screen, 4, 3, 0)
 	if err != nil {
-		return err
+		return
 	}
 
 	for _, label := range v.labels {
@@ -141,8 +141,6 @@ func (v *Credits) Render(screen d2interface.Surface) error {
 
 		label.Label.Render(screen)
 	}
-
-	return nil
 }
 
 // Advance runs the update logic on the credits screen

d2game/d2gamescreen/game.go

@@ -196,17 +196,14 @@ func (v *Game) OnUnload() error {
 }
 
 // Render renders the Gameplay screen
-func (v *Game) Render(screen d2interface.Surface) error {
+func (v *Game) Render(screen d2interface.Surface) {
 	if v.gameClient.RegenMap {
 		v.gameClient.RegenMap = false
 		v.mapRenderer.RegenerateTileCache()
 		v.gameClient.MapEngine.IsLoading = false
 	}
 
-	if err := screen.Clear(color.Black); err != nil {
+	screen.Clear(color.Black)
-		return err
-	}
-
 	v.mapRenderer.Render(screen)
 
 	if v.gameControls != nil {
@@ -215,11 +212,9 @@ func (v *Game) Render(screen d2interface.Surface) error {
 		}
 
 		if err := v.gameControls.Render(screen); err != nil {
-			return err
+			return
 		}
 	}
-
-	return nil
 }
 
 // Advance runs the update logic on the Gameplay screen

d2game/d2gamescreen/gui_testing.go

@@ -94,9 +94,7 @@ func (g *GuiTestMain) OnLoad(loading d2screen.LoadingState) {
 }
 
 // Render does nothing for the GuiTestMain screen
-func (g *GuiTestMain) Render(_ d2interface.Surface) error {
+func (g *GuiTestMain) Render(_ d2interface.Surface) { /* NOOP */ }
-	return nil
-}
 
 // Advance does nothing for the GuiTestMain screen
 func (g *GuiTestMain) Advance(_ float64) error {

d2game/d2gamescreen/main_menu.go

@@ -406,69 +406,44 @@ func (v *MainMenu) onCreditsButtonClicked() {
 }
 
 // Render renders the main menu
-func (v *MainMenu) Render(screen d2interface.Surface) error {
+func (v *MainMenu) Render(screen d2interface.Surface) {
-	if err := v.renderBackgrounds(screen); err != nil {
+	v.renderBackgrounds(screen)
-		return err
+	v.renderLogos(screen)
-	}
+	v.renderLabels(screen)
-
-	if err := v.renderLogos(screen); err != nil {
-		return err
-	}
-
-	if err := v.renderLabels(screen); err != nil {
-		return err
-	}
-
-	return nil
 }
 
-func (v *MainMenu) renderBackgrounds(screen d2interface.Surface) error {
+func (v *MainMenu) renderBackgrounds(screen d2interface.Surface) {
 	switch v.screenMode {
 	case ScreenModeTrademark:
 		if err := v.trademarkBackground.RenderSegmented(screen, 4, 3, 0); err != nil {
-			return err
+			return
 		}
 	case ScreenModeServerIP:
 		if err := v.serverIPBackground.RenderSegmented(screen, 2, 1, 0); err != nil {
-			return err
+			return
 		}
 	case ScreenModeTCPIP:
 		if err := v.tcpIPBackground.RenderSegmented(screen, 4, 3, 0); err != nil {
-			return err
+			return
 		}
 	default:
 		if err := v.background.RenderSegmented(screen, 4, 3, 0); err != nil {
-			return err
+			return
 		}
 	}
-
-	return nil
 }
 
-func (v *MainMenu) renderLogos(screen d2interface.Surface) error {
+func (v *MainMenu) renderLogos(screen d2interface.Surface) {
 	switch v.screenMode {
 	case ScreenModeTrademark, ScreenModeMainMenu, ScreenModeMultiplayer:
-		if err := v.diabloLogoLeftBack.Render(screen); err != nil {
+		v.diabloLogoLeftBack.Render(screen)
-			return err
+		v.diabloLogoRightBack.Render(screen)
-		}
+		v.diabloLogoLeft.Render(screen)
-
+		v.diabloLogoRight.Render(screen)
-		if err := v.diabloLogoRightBack.Render(screen); err != nil {
-			return err
-		}
-
-		if err := v.diabloLogoLeft.Render(screen); err != nil {
-			return err
-		}
-
-		if err := v.diabloLogoRight.Render(screen); err != nil {
-			return err
-		}
 	}
-
-	return nil
 }
 
-func (v *MainMenu) renderLabels(screen d2interface.Surface) error {
+func (v *MainMenu) renderLabels(screen d2interface.Surface) {
 	switch v.screenMode {
 	case ScreenModeServerIP:
 		v.tcpIPOptionsLabel.Render(screen)
@@ -483,8 +458,6 @@ func (v *MainMenu) renderLabels(screen d2interface.Surface) error {
 		v.versionLabel.Render(screen)
 		v.commitLabel.Render(screen)
 	}
-
-	return nil
 }
 
 // Advance runs the update logic on the main menu

d2game/d2gamescreen/map_engine_testing.go

@@ -239,7 +239,7 @@ const (
 )
 
 // Render renders the Map Engine Test screen
-func (met *MapEngineTest) Render(screen d2interface.Surface) error {
+func (met *MapEngineTest) Render(screen d2interface.Surface) {
 	met.mapRenderer.Render(screen)
 
 	screen.PushTranslation(0, lineNormalOffsetY)
@@ -265,14 +265,10 @@ func (met *MapEngineTest) Render(screen d2interface.Surface) error {
 	screen.PushTranslation(0, lineNormalOffsetY)
 	defer screen.Pop()
 
-	if err := met.renderTileInfo(screen); err != nil {
+	met.renderTileInfo(screen)
-		return err
-	}
-
-	return nil
 }
 
-func (met *MapEngineTest) renderTileInfo(screen d2interface.Surface) error {
+func (met *MapEngineTest) renderTileInfo(screen d2interface.Surface) {
 	if met.selectedTile == nil {
 		screen.PushTranslation(lineNormalIndentX, lineNormalOffsetY)
 		defer screen.Pop()
@@ -371,8 +367,6 @@ func (met *MapEngineTest) renderTileInfo(screen d2interface.Surface) error {
 		}
 		screen.PopN(tpop)
 	}
-
-	return nil
 }
 
 // OnMouseMove is the mouse move handler

d2game/d2gamescreen/select_hero_class.go

@@ -511,9 +511,9 @@ func (v *SelectHeroClass) onOkButtonClicked() {
 }
 
 // Render renders the Select Hero Class screen
-func (v *SelectHeroClass) Render(screen d2interface.Surface) error {
+func (v *SelectHeroClass) Render(screen d2interface.Surface) {
 	if err := v.bgImage.RenderSegmented(screen, 4, 3, 0); err != nil {
-		return err
+		return
 	}
 
 	v.headingLabel.Render(screen)
@@ -537,17 +537,13 @@ func (v *SelectHeroClass) Render(screen d2interface.Surface) error {
 		}
 	}
 
-	if err := v.campfire.Render(screen); err != nil {
+	v.campfire.Render(screen)
-		return err
-	}
 
 	if v.heroNameTextbox.GetVisible() {
 		v.heroNameLabel.Render(screen)
 		v.expansionCharLabel.Render(screen)
 		v.hardcoreCharLabel.Render(screen)
 	}
-
-	return nil
 }
 
 // Advance runs the update logic on the Select Hero Class screen
@@ -744,10 +740,7 @@ func setSpriteToFirstFrame(sprite *d2ui.Sprite) {
 
 func drawSprite(sprite *d2ui.Sprite, target d2interface.Surface) {
 	if sprite != nil {
-		if err := sprite.Render(target); err != nil {
+		sprite.Render(target)
-			x, y := sprite.GetPosition()
-			fmt.Printf("could not render the sprite to the position(x: %d, y: %d)\n", x, y)
-		}
 	}
 }
 

d2game/d2player/game_controls.go

@@ -964,16 +964,12 @@ func (g *GameControls) renderForSelectableEntitiesHovered(target d2interface.Sur
 }
 
 func (g *GameControls) renderPanels(target d2interface.Surface) error {
-	if err := g.heroStatsPanel.Render(target); err != nil {
+	g.heroStatsPanel.Render(target)
-		return err
+	g.inventory.Render(target)
-	}
 
-	if err := g.inventory.Render(target); err != nil {
+	err := g.skilltree.Render(target)
-		return err
+	if err != nil {
-	}
+		log.Println(err)
-
-	if err := g.skilltree.Render(target); err != nil {
-		return err
 	}
 
 	return nil
@@ -1104,10 +1100,7 @@ func (g *GameControls) renderPanel(x, y int, target d2interface.Surface) error {
 	}
 
 	g.mainPanel.SetPosition(x, y)
-
+	g.mainPanel.Render(target)
-	if err := g.mainPanel.Render(target); err != nil {
-		return err
-	}
 
 	return nil
 }
@@ -1123,9 +1116,7 @@ func (g *GameControls) renderHealthGlobe(x, y int, target d2interface.Surface) e
 	g.hpManaStatusSprite.SetPosition(x+healthStatusOffsetX, y+healthStatusOffsetY)
 
 	healthMaskRect := image.Rect(0, globeHeight-hpBarHeight, globeWidth, globeHeight)
-	if err := g.hpManaStatusSprite.RenderSection(target, healthMaskRect); err != nil {
+	g.hpManaStatusSprite.RenderSection(target, healthMaskRect)
-		return err
-	}
 
 	// Left globe
 	if err := g.globeSprite.SetCurrentFrame(frameHealthStatus); err != nil {
@@ -1133,10 +1124,7 @@ func (g *GameControls) renderHealthGlobe(x, y int, target d2interface.Surface) e
 	}
 
 	g.globeSprite.SetPosition(x+globeSpriteOffsetX, y+globeSpriteOffsetY)
-
+	g.globeSprite.Render(target)
-	if err := g.globeSprite.Render(target); err != nil {
-		return err
-	}
 
 	return nil
 }
@@ -1153,10 +1141,7 @@ func (g *GameControls) renderLeftSkill(x, y int, target d2interface.Surface) err
 	}
 
 	g.leftSkillResource.SkillIcon.SetPosition(x, y)
-
+	g.leftSkillResource.SkillIcon.Render(target)
-	if err := g.leftSkillResource.SkillIcon.Render(target); err != nil {
-		return err
-	}
 
 	return nil
 }
@@ -1167,10 +1152,7 @@ func (g *GameControls) renderNewStatsButton(x, y int, target d2interface.Surface
 	}
 
 	g.mainPanel.SetPosition(x, y)
-
+	g.mainPanel.Render(target)
-	if err := g.mainPanel.Render(target); err != nil {
-		return err
-	}
 
 	return nil
 }
@@ -1181,10 +1163,7 @@ func (g *GameControls) renderStamina(x, y int, target d2interface.Surface) error
 	}
 
 	g.mainPanel.SetPosition(x, y)
-
+	g.mainPanel.Render(target)
-	if err := g.mainPanel.Render(target); err != nil {
-		return err
-	}
 
 	return nil
 }
@@ -1235,14 +1214,8 @@ func (g *GameControls) renderMiniPanel(target d2interface.Surface) error {
 	buttonX, buttonY := (width>>1)+miniPanelButtonOffsetX, height+miniPanelButtonOffsetY
 
 	g.menuButton.SetPosition(buttonX, buttonY)
-
+	g.menuButton.Render(target)
-	if err := g.menuButton.Render(target); err != nil {
+	g.miniPanel.Render(target)
-		return err
-	}
-
-	if err := g.miniPanel.Render(target); err != nil {
-		return err
-	}
 
 	miniPanelButtons := map[actionableType]string{
 		miniPanelCharacter:  "minipanelchar",
@@ -1292,10 +1265,7 @@ func (g *GameControls) renderPotions(x, _ int, target d2interface.Surface) error
 	}
 
 	g.mainPanel.SetPosition(x, height)
-
+	g.mainPanel.Render(target)
-	if err := g.mainPanel.Render(target); err != nil {
-		return err
-	}
 
 	return nil
 }
@@ -1308,10 +1278,7 @@ func (g *GameControls) renderNewSkillsButton(x, _ int, target d2interface.Surfac
 	}
 
 	g.mainPanel.SetPosition(x, height)
-
+	g.mainPanel.Render(target)
-	if err := g.mainPanel.Render(target); err != nil {
-		return err
-	}
 
 	return nil
 }
@@ -1330,10 +1297,7 @@ func (g *GameControls) renderRightSkill(x, _ int, target d2interface.Surface) er
 	}
 
 	g.rightSkillResource.SkillIcon.SetPosition(x, height)
-
+	g.rightSkillResource.SkillIcon.Render(target)
-	if err := g.rightSkillResource.SkillIcon.Render(target); err != nil {
-		return err
-	}
 
 	return nil
 }
@@ -1347,9 +1311,7 @@ func (g *GameControls) renderManaGlobe(x, _ int, target d2interface.Surface) err
 
 	g.mainPanel.SetPosition(x, height)
 
-	if err := g.mainPanel.Render(target); err != nil {
+	g.mainPanel.Render(target)
-		return err
-	}
 
 	// Mana status bar
 	manaPercent := float64(g.hero.Stats.Mana) / float64(g.hero.Stats.MaxMana)
@@ -1362,9 +1324,7 @@ func (g *GameControls) renderManaGlobe(x, _ int, target d2interface.Surface) err
 	g.hpManaStatusSprite.SetPosition(x+manaStatusOffsetX, height+manaStatusOffsetY)
 
 	manaMaskRect := image.Rect(0, globeHeight-manaBarHeight, globeWidth, globeHeight)
-	if err := g.hpManaStatusSprite.RenderSection(target, manaMaskRect); err != nil {
+	g.hpManaStatusSprite.RenderSection(target, manaMaskRect)
-		return err
-	}
 
 	// Right globe
 	if err := g.globeSprite.SetCurrentFrame(frameRightGlobe); err != nil {
@@ -1373,13 +1333,8 @@ func (g *GameControls) renderManaGlobe(x, _ int, target d2interface.Surface) err
 
 	g.globeSprite.SetPosition(x+rightGlobeOffsetX, height+rightGlobeOffsetY)
 
-	if err := g.globeSprite.Render(target); err != nil {
+	g.globeSprite.Render(target)
-		return err
+	g.globeSprite.Render(target)
-	}
-
-	if err := g.globeSprite.Render(target); err != nil {
-		return err
-	}
 
 	return nil
 }

d2game/d2player/help/help.go

@@ -602,10 +602,7 @@ func (h *Overlay) Render(target d2interface.Surface) error {
 	}
 
 	for _, f := range h.frames {
-		err := f.Render(target)
+		f.Render(target)
-		if err != nil {
-			return err
-		}
 	}
 
 	for _, t := range h.text {

d2game/d2player/hero_stats_panel.go

@@ -174,34 +174,27 @@ func (s *HeroStatsPanel) SetOnCloseCb(cb func()) {
 }
 
 // Render renders the hero status panel
-func (s *HeroStatsPanel) Render(target d2interface.Surface) error {
+func (s *HeroStatsPanel) Render(target d2interface.Surface) {
 	if !s.isOpen {
-		return nil
+		return
 	}
 
 	if s.staticMenuImageCache == nil {
 		frameWidth, frameHeight := s.frame.GetFrameBounds()
 		framesCount := s.frame.GetFrameCount()
-		surface, err := s.renderer.NewSurface(frameWidth*framesCount, frameHeight*framesCount, d2enum.FilterNearest)
+		surface := s.renderer.NewSurface(frameWidth*framesCount, frameHeight*framesCount)
-
-		if err != nil {
-			return err
-		}
 
 		s.staticMenuImageCache = &surface
 
-		if err := s.renderStaticMenu(*s.staticMenuImageCache); err != nil {
+		err := s.renderStaticMenu(*s.staticMenuImageCache)
-			return err
+		if err != nil {
+			log.Println(err)
 		}
 	}
 
-	if err := target.Render(*s.staticMenuImageCache); err != nil {
+	target.Render(*s.staticMenuImageCache)
-		return err
-	}
 
 	s.renderStatValues(target)
-
-	return nil
 }
 
 func (s *HeroStatsPanel) renderStaticMenu(target d2interface.Surface) error {
@@ -249,9 +242,7 @@ func (s *HeroStatsPanel) renderStaticPanelFrames(target d2interface.Surface) err
 			s.panel.SetPosition(currentX-w, currentY+h)
 		}
 
-		if err := s.panel.Render(target); err != nil {
+		s.panel.Render(target)
-			return err
-		}
 	}
 
 	return nil

d2game/d2player/inventory.go

@@ -2,6 +2,7 @@ package d2player
 
 import (
 	"fmt"
+	"log"
 
 	"github.com/OpenDiablo2/OpenDiablo2/d2core/d2records"
 
@@ -158,20 +159,18 @@ func (g *Inventory) Load() {
 }
 
 // Render draws the inventory onto the given surface
-func (g *Inventory) Render(target d2interface.Surface) error {
+func (g *Inventory) Render(target d2interface.Surface) {
 	if !g.isOpen {
-		return nil
+		return
 	}
 
-	if err := g.renderFrame(target); err != nil {
+	err := g.renderFrame(target)
-		return err
+	if err != nil {
+		log.Println(err)
 	}
 
 	g.grid.Render(target)
-
 	g.renderItemHover(target)
-
-	return nil
 }
 
 func (g *Inventory) renderFrame(target d2interface.Surface) error {
@@ -197,10 +196,7 @@ func (g *Inventory) renderFrame(target d2interface.Surface) error {
 		w, h := g.panel.GetCurrentFrameSize()
 
 		g.panel.SetPosition(x, y+h)
-
+		g.panel.Render(target)
-		if err := g.panel.Render(target); err != nil {
-			return err
-		}
 
 		switch frame {
 		case frameInventoryTopLeft:

d2game/d2player/inventory_grid.go

@@ -234,11 +234,7 @@ func (g *ItemGrid) renderItem(item InventoryItem, target d2interface.Surface, x,
 	if itemSprite != nil {
 		itemSprite.SetPosition(x, y)
 		itemSprite.GetCurrentFrameSize()
-
+		itemSprite.Render(target)
-		err := itemSprite.Render(target)
-		if err != nil {
-			log.Print(err)
-		}
 	}
 }
 

d2game/d2player/mini_panel.go

@@ -89,13 +89,13 @@ func (m *miniPanel) Close() {
 	m.isOpen = false
 }
 
-func (m *miniPanel) Render(target d2interface.Surface) error {
+func (m *miniPanel) Render(target d2interface.Surface) {
 	if !m.isOpen {
-		return nil
+		return
 	}
 
 	if err := m.container.SetCurrentFrame(0); err != nil {
-		return err
+		return
 	}
 
 	width, height := target.GetSize()
@@ -104,9 +104,7 @@ func (m *miniPanel) Render(target d2interface.Surface) error {
 
 	m.container.SetPosition(x, y)
 
-	if err := m.container.Render(target); err != nil {
+	m.container.Render(target)
-		return err
-	}
 
 	buttonWidth, _ := m.button.GetCurrentFrameSize()
 	buttonWidth++
@@ -117,22 +115,17 @@ func (m *miniPanel) Render(target d2interface.Surface) error {
 		}
 
 		if err := m.button.SetCurrentFrame(j); err != nil {
-			return err
+			return
 		}
 
 		offsetX := buttonOffsetX + (buttonWidth * i)
 		x, y := halfW+offsetX, height+buttonOffsetY
 
 		m.button.SetPosition(x, y)
-
+		m.button.Render(target)
-		if err := m.button.Render(target); err != nil {
-			return err
-		}
 
 		j += 2
 	}
-
-	return nil
 }
 
 func (m *miniPanel) isInRect(x, y int) bool {

d2game/d2player/skill_select_panel.go

@@ -5,7 +5,6 @@ import (
 	"log"
 	"sort"
 
-	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2enum"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2fileformats/d2tbl"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2geom"
 	"github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface"
@@ -124,11 +123,7 @@ func (s *SkillPanel) Render(target d2interface.Surface) error {
 		rowOffsetY := skillPanelOffsetY - (renderedRows * skillIconHeight)
 
 		target.PushTranslation(startX, rowOffsetY)
-
+		target.Render(skillListRow.cachedImage)
-		if err := target.Render(skillListRow.cachedImage); err != nil {
-			return err
-		}
-
 		target.Pop()
 
 		renderedRows++
@@ -222,11 +217,7 @@ func (s *SkillPanel) generateSkillRowImageCache() error {
 }
 
 func (s *SkillPanel) createSkillListImage(skillsListRow *SkillListRow) (d2interface.Surface, error) {
-	surface, err := s.renderer.NewSurface(len(skillsListRow.Skills)*skillIconWidth, skillIconHeight, d2enum.FilterNearest)
+	surface := s.renderer.NewSurface(len(skillsListRow.Skills)*skillIconWidth, skillIconHeight)
-
-	if err != nil {
-		return nil, err
-	}
 
 	lastSkillResourcePath := d2resource.GenericSkills
 	skillSprite, _ := s.ui.NewSprite(s.getSkillResourceByClass(""), d2resource.PaletteSky)
@@ -250,11 +241,7 @@ func (s *SkillPanel) createSkillListImage(skillsListRow *SkillListRow) (d2interf
 		}
 
 		surface.PushTranslation(idx*skillIconWidth, 50)
-
+		skillSprite.Render(surface)
-		if err := skillSprite.Render(surface); err != nil {
-			return nil, err
-		}
-
 		surface.Pop()
 	}
 

d2game/d2player/skilltree.go

@@ -376,9 +376,7 @@ func (s *skillTree) renderPanelSegment(
 		return err
 	}
 
-	if err := s.resources.skillPanel.Render(target); err != nil {
+	s.resources.skillPanel.Render(target)
-		return err
-	}
 
 	return nil
 }
@@ -520,10 +518,7 @@ func (s *skillTree) renderSkillIcons(target d2interface.Surface, tab int) error
 		y := skillIconYOff + skill.SkillRow*skillIconDistY
 
 		skillIcon.SetPosition(x, y)
-
+		skillIcon.Render(target)
-		if err := skillIcon.Render(target); err != nil {
-			return err
-		}
 	}
 
 	return nil

go.mod

@@ -10,10 +10,11 @@ require (
 	github.com/google/uuid v1.1.2
 	github.com/gravestench/akara v0.0.0-20201014060234-a64208a7fd3c
 	github.com/hajimehoshi/ebiten v1.11.4
+	github.com/hajimehoshi/ebiten/v2 v2.0.0
 	github.com/pkg/profile v1.5.0
 	github.com/robertkrimen/otto v0.0.0-20191219234010-c382bd3c16ff
 	github.com/stretchr/testify v1.4.0
-	golang.org/x/image v0.0.0-20200618115811-c13761719519
+	golang.org/x/image v0.0.0-20200927104501-e162460cd6b5
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
 	gopkg.in/sourcemap.v1 v1.0.5 // indirect
 )

go.sum

@@ -7,88 +7,95 @@ github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2c
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4 h1:WtGNWLvXpe6ZudgnXrq0barxBImvnnJoMEhXAzcbM0I=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200707082815-5321531c36a2 h1:Ac1OEHHkbAZ6EUnJahF0GKcU0FjPc/V8F1DvjhKngFE=
+github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200707082815-5321531c36a2/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-restruct/restruct v0.0.0-20191227155143-5734170a48a1 h1:LoN2wx/aN8JPGebG+2DaUyk4M+xRcqJXfuIbs8AWHdE=
 github.com/go-restruct/restruct v0.0.0-20191227155143-5734170a48a1/go.mod h1:KqrpKpn4M8OLznErihXTGLlsXFGeLxHUrLRRI/1YjGk=
-github.com/gofrs/flock v0.7.1 h1:DP+LD/t0njgoPBvT5MJLeliUIVQR03hiKR6vezdwHlc=
 github.com/gofrs/flock v0.7.1/go.mod h1:F1TvTiK9OcQqauNUHlbJvyl9Qa1QvF/gOUDKA14jxHU=
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 github.com/gravestench/akara v0.0.0-20201014060234-a64208a7fd3c/go.mod h1:fTeda1SogMg5Lkd4lXMEd/Pk/a5/gQuLGaAI2rn1PBQ=
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 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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+golang.org/x/tools v0.0.0-20201009162240-fcf82128ed91/go.mod h1:z6u4i615ZeAfBE4XtMziQW1fSVJXACjjbWkB/mvPzlU=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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-gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/sourcemap.v1 v1.0.5 h1:inv58fC9f9J3TK2Y2R1NPntXEn3/wjWHkonhIUODNTI=
+gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/sourcemap.v1 v1.0.5/go.mod h1:2RlvNNSMglmRrcvhfuzp4hQHwOtjxlbjX7UPY/GXb78=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

main.go

@@ -40,10 +40,7 @@ func main() {
 		panic(err)
 	}
 
-	audio, err := ebiten2.CreateAudio(asset)
+	audio := ebiten2.CreateAudio(asset)
-	if err != nil {
-		panic(err)
-	}
 
 	inputManager := d2input.NewInputManager()