Change TextureFactory.NewRenderTarget

example/game/rects/rects.go

@@ -36,8 +36,15 @@ func New() *Rects {
 }
 
 func (game *Rects) InitTextures(tf graphics.TextureFactory) {
-	game.rectTextureID = tf.NewRenderTarget(rectTextureWidth, rectTextureHeight)
-	game.offscreenID = tf.NewRenderTarget(offscreenWidth, offscreenHeight)
+	var err error
+	game.rectTextureID, err = tf.NewRenderTarget(rectTextureWidth, rectTextureHeight)
+	if err != nil {
+		panic(err)
+	}
+	game.offscreenID, err = tf.NewRenderTarget(offscreenWidth, offscreenHeight)
+	if err != nil {
+		panic(err)
+	}
 }
 
 func (game *Rects) Update(context ebiten.GameContext) {

graphics/graphics.go

@@ -35,7 +35,7 @@ type Context interface {
 }
 
 type TextureFactory interface {
-	NewRenderTarget(width, height int) RenderTargetID
+	NewRenderTarget(width, height int) (RenderTargetID, error)
 	NewTextureFromImage(img image.Image) (TextureID, error)
 }
 

graphics/opengl/context.go

@@ -51,8 +51,12 @@ func (context *Context) Init() {
 
 	initializeShaders()
 
-	context.screenId = context.NewRenderTarget(
+	var err error
+	context.screenId, err = context.NewRenderTarget(
 		context.screenWidth, context.screenHeight)
+	if err != nil {
+		panic("initializing the offscreen failed: " + err.Error())
+	}
 }
 
 func (context *Context) ToTexture(renderTargetID graphics.RenderTargetID) graphics.TextureID {
@@ -262,8 +266,12 @@ func (context *Context) setShaderProgram(
 	return
 }
 
-func (context *Context) NewRenderTarget(width, height int) graphics.RenderTargetID {
-	renderTarget := newRenderTarget(width, height)
+func (context *Context) NewRenderTarget(width, height int) (
+	graphics.RenderTargetID, error) {
+	renderTarget, err := newRenderTarget(width, height)
+	if err != nil {
+		return 0, nil
+	}
 	renderTargetId := graphics.RenderTargetID(<-newId)
 	textureId := graphics.TextureID(<-newId)
 	context.renderTargets[renderTargetId] = renderTarget
@@ -274,7 +282,7 @@ func (context *Context) NewRenderTarget(width, height int) graphics.RenderTarget
 	context.Clear()
 	context.setMainFramebufferOffscreen()
 
-	return renderTargetId
+	return renderTargetId, nil
 }
 
 func (context *Context) NewTextureFromImage(img image.Image) (

graphics/opengl/texture.go

@@ -67,7 +67,16 @@ func createTexture(width, height int) *Texture {
 	}
 }
 
-func createTextureFromImage(img image.Image) *Texture {
+func newRenderTarget(width, height int) (*RenderTarget, error) {
+	texture := createTexture(width, height)
+	framebuffer := createFramebuffer(texture.native)
+	return &RenderTarget{
+		texture:     texture,
+		framebuffer: framebuffer,
+	}, nil
+}
+
+func newTextureFromImage(img image.Image) (*Texture, error) {
 	size := img.Bounds().Size()
 	width, height := size.X, size.Y
 
@@ -93,20 +102,7 @@ func createTextureFromImage(img image.Image) *Texture {
 		textureWidth:  textureWidth,
 		textureHeight: textureHeight,
 		native:        nativeTexture,
-	}
-}
-
-func newRenderTarget(width, height int) *RenderTarget {
-	texture := createTexture(width, height)
-	framebuffer := createFramebuffer(texture.native)
-	return &RenderTarget{
-		texture:     texture,
-		framebuffer: framebuffer,
-	}
-}
-
-func newTextureFromImage(img image.Image) (*Texture, error) {
-	return createTextureFromImage(img), nil
+	}, nil
 }
 
 func newRenderTargetWithFramebuffer(width, height int,