diff --git a/Diya/DiskStore.extension.st b/Diya/DiskStore.extension.st
new file mode 100644
index 0000000..14bdc3a
--- /dev/null
+++ b/Diya/DiskStore.extension.st
@@ -0,0 +1,6 @@
+Extension { #name : #DiskStore }
+
+{ #category : #'*Diya' }
+DiskStore class >> inform: string [
+	Transcript show: string; cr.
+]
diff --git a/Diya/DiyaApplicationLauncher.class.st b/Diya/DiyaApplicationLauncher.class.st
index 7ea7fd3..407e268 100644
--- a/Diya/DiyaApplicationLauncher.class.st
+++ b/Diya/DiyaApplicationLauncher.class.st
@@ -34,7 +34,7 @@ DiyaApplicationLauncher >> defaultApplication [
 	^DiyaExampleApp
 ]
 
-{ #category : #'as yet unclassified' }
+{ #category : #accessing }
 DiyaApplicationLauncher >> delta: delta [
 	|fps|
 	delta = 0 ifTrue:[^self].
diff --git a/Diya/DiyaBoot.class.st b/Diya/DiyaBoot.class.st
index 245cf43..3eae063 100644
--- a/Diya/DiyaBoot.class.st
+++ b/Diya/DiyaBoot.class.st
@@ -84,14 +84,12 @@ DiyaBoot >> init [
 	status = 0 
 		ifFalse: [ ^ DiyaCoreAPIError signal: SDL2 getErrorMessage ].
 	display := SDL_DisplayMode externalNew autoRelease.
-	Smalltalk globals at: #Display ifAbsentPut:display.
-	Smalltalk globals at: #DiyaDisplay put:display.
 	SDL2 SDLGetCurrentDisplayMode: display from:0.
 	SDL2 showCursor: 0.
+	Smalltalk globals at: #Display ifAbsentPut:display.
+	Smalltalk globals at: #DiyaDisplay put:display.
 	DiyaSingleton resetAll.
 	DiyaFontManager uniqueInstance loadFonts.
-
-Form class removeSelector: #serviceImageAsBackground
 ]
 
 { #category : #events }
@@ -191,6 +189,7 @@ DiyaBoot >> showSystemInfo [
 	].
 	stream cr.
 	stream nextPutAll: DiyaDisplay asString; cr.
+	stream cr.
 	self stdout nextPutAll: stream contents
 	
 ]
@@ -203,8 +202,10 @@ DiyaBoot >> startx [
 	"SDL2 glMakeCurrent: window  context: context." 
 	self showSystemInfo.
 	DiyaRendererContext
-		uniqueInstance display: display;
-		useProjection: OrthoProjectionMatrix.
+		uniqueInstance
+			display: display;
+			window: window;
+			useProjection: OrthoProjectionMatrix.
 	self render.
 	context delete.
 	window destroy.
diff --git a/Diya/DiyaButton.class.st b/Diya/DiyaButton.class.st
index 401a96b..c849c19 100644
--- a/Diya/DiyaButton.class.st
+++ b/Diya/DiyaButton.class.st
@@ -39,14 +39,14 @@ DiyaButton >> label [
 ]
 
 { #category : #accessing }
-DiyaButton >> text: string [
-	label txt: string.
-]
-
-{ #category : #accessing }
-DiyaButton >> update [
+DiyaButton >> process [
 	rec extent: self extent.
 	label position: 0@0.
 	label extent: self extent.
 	^true
 ]
+
+{ #category : #accessing }
+DiyaButton >> text: string [
+	label txt: string.
+]
diff --git a/Diya/DiyaEllipse.class.st b/Diya/DiyaEllipse.class.st
index b3bdd16..b3ba463 100644
--- a/Diya/DiyaEllipse.class.st
+++ b/Diya/DiyaEllipse.class.st
@@ -49,6 +49,21 @@ DiyaEllipse >> inner: aPoint [
 	^ ((((dxy x) ** 2)/(rx**2)) + (((dxy y) ** 2) / (ry**2))) < 1.
 ]
 
+{ #category : #accessing }
+DiyaEllipse >> process [
+	bbox := Rectangle origin: ((rx negated) @ (ry negated)) corner: (rx @ ry).
+	{
+		bbox origin x. bbox origin y. 0.0. 0.0.            
+      bbox origin x. bbox corner y. 0.0. 1.0.
+      bbox corner x. bbox corner y. 1.0. 1.0.
+
+		bbox corner x. bbox corner y. 1.0. 1.0.
+		bbox corner x. bbox origin y. 1.0. 0.0.
+		bbox origin x. bbox origin y. 0.0. 0.0.      
+	} doWithIndex: [:e :i| vbuffer at: i put: e].
+	^true
+]
+
 { #category : #accessing }
 DiyaEllipse >> rx [
 	^ rx
@@ -80,18 +95,3 @@ DiyaEllipse >> setUpShader [
 		setUniform: #u_rx value: rx;
 		setUniform: #u_ry value: ry.
 ]
-
-{ #category : #accessing }
-DiyaEllipse >> update [
-	bbox := Rectangle origin: ((rx negated) @ (ry negated)) corner: (rx @ ry).
-	{
-		bbox origin x. bbox origin y. 0.0. 0.0.            
-      bbox origin x. bbox corner y. 0.0. 1.0.
-      bbox corner x. bbox corner y. 1.0. 1.0.
-
-		bbox corner x. bbox corner y. 1.0. 1.0.
-		bbox corner x. bbox origin y. 1.0. 0.0.
-		bbox origin x. bbox origin y. 0.0. 0.0.      
-	} doWithIndex: [:e :i| vbuffer at: i put: e].
-	^true
-]
diff --git a/Diya/DiyaExampleApp.class.st b/Diya/DiyaExampleApp.class.st
index 3233f63..9a3392e 100644
--- a/Diya/DiyaExampleApp.class.st
+++ b/Diya/DiyaExampleApp.class.st
@@ -130,5 +130,6 @@ DiyaExampleApp >> setup [
 	button icon:16rF185"'mrsang.png'".
 	"button rotation: Float pi / 2.0."
 	button styleName: #button_view.
+	Transcript show: 'Application setup';cr.
 	^ root 
 ]
diff --git a/Diya/DiyaFontIcon.class.st b/Diya/DiyaFontIcon.class.st
index 55be2cb..713171e 100644
--- a/Diya/DiyaFontIcon.class.st
+++ b/Diya/DiyaFontIcon.class.st
@@ -59,8 +59,8 @@ DiyaFontIcon >> lastSeparatorFrom: i [
 ]
 
 { #category : #initialization }
-DiyaFontIcon >> update [
+DiyaFontIcon >> process [
 	data ifNil: [ ^self ].
 	bbox := Rectangle origin: 0@0 corner: ((data size) * (self fontSize) ) @ self fontSize.
-	^ super update.
+	^ super process.
 ]
diff --git a/Diya/DiyaImageIcon.class.st b/Diya/DiyaImageIcon.class.st
index 4b0aa08..cf73cf9 100644
--- a/Diya/DiyaImageIcon.class.st
+++ b/Diya/DiyaImageIcon.class.st
@@ -20,9 +20,9 @@ DiyaImageIcon >> initialize [
 ]
 
 { #category : #accessing }
-DiyaImageIcon >> update [
+DiyaImageIcon >> process [
 	|v|
 	v := self iconSize.
 	self extent: (v@v).
-	^super update
+	^super process
 ]
diff --git a/Diya/DiyaImageTex.class.st b/Diya/DiyaImageTex.class.st
index 925269d..8575755 100644
--- a/Diya/DiyaImageTex.class.st
+++ b/Diya/DiyaImageTex.class.st
@@ -36,32 +36,28 @@ DiyaImageTex >> drop [
 
 { #category : #capture }
 DiyaImageTex >> flipY [
-	|buffer idx idxf|
-	buffer := FFIExternalArray externalNewType: GLubyte size: width * height * 4.
+	|buffer size linesize top bottom|
+	size := self bytesSize.
+	linesize := width << 2.
+	buffer := FFIExternalArray externalNewType: GLubyte size: linesize.
 	LibC memset: buffer getHandle value: 0 size: buffer size.
-	buffer autoRelease.
-	0 to: height - 1 do:[:y|
-		0 to: width - 1 do:[:x|
-			idx := ((y * width) + x)*4 + 1.
-			idxf := ((height - y)*width + x)*4 + 1.
-			buffer at: idx put: (data at: idxf).
-			buffer at: idx+1 put: (data at: idxf+1).
-			buffer at: idx+2 put: (data at: idxf+2).
-			buffer at: idx+3 put: (data at: idxf+3).
-		].	
+	0 to: (height >> 1) -1 do: [ :line|
+		top := line * linesize.
+		bottom := (size - (linesize * (line + 1))).
+		LibC memCopy: (data getHandle) + top to: buffer getHandle size: linesize.
+		LibC memCopy: (data getHandle) + bottom to: (data getHandle) + top size: linesize.
+		LibC memCopy: buffer getHandle to: (data getHandle) + bottom size: linesize.
 	].
-	data free.
-	data := buffer.
-	
-	
+	buffer free
 ]
 
 { #category : #capture }
 DiyaImageTex >> fromDisplay:  aRect as: assetName [
 	surface ifNotNil: [ surface free ] ifNil: [data ifNotNil: [data free]].
 	surface := nil.
-	Transcript show:'allocate ', ((aRect extent x) * (aRect extent y) * 4) asInteger asString,' bytes';cr.
-	data := FFIExternalArray externalNewType: GLubyte size:((aRect extent x) * (aRect extent y) * 4) asInteger.
+	width := aRect extent x asInteger.
+	height := aRect extent y asInteger.
+	data := FFIExternalArray externalNewType: GLubyte size: self bytesSize.
 	LibC memset: data getHandle value: 0 size: data size.
 	data autoRelease.
 	OpenGL readPixelsOn: data getHandle
@@ -71,11 +67,8 @@ DiyaImageTex >> fromDisplay:  aRect as: assetName [
 		h: aRect extent y
 		format:GL_RGBA
 		type: GL_UNSIGNED_BYTE.
-	width := aRect extent x.
-	height := aRect extent y.
 	name := assetName.
 	self flipY.
-	
 ]
 
 { #category : #capture }
diff --git a/Diya/DiyaLabel.class.st b/Diya/DiyaLabel.class.st
index 4d441a8..3c0184d 100644
--- a/Diya/DiyaLabel.class.st
+++ b/Diya/DiyaLabel.class.st
@@ -52,18 +52,7 @@ DiyaLabel >> initialize [
 ]
 
 { #category : #accessing }
-DiyaLabel >> txt [
-	^ txt
-]
-
-{ #category : #accessing }
-DiyaLabel >> txt: anObject [
-	txt data: anObject.
-	self setDirty
-]
-
-{ #category : #accessing }
-DiyaLabel >> update [
+DiyaLabel >> process [
 	|offset isize align|
 	offset := 0.
 	icon ifNotNil: [
@@ -73,7 +62,7 @@ DiyaLabel >> update [
 	].
 	txt extent: (extent x - offset) @ (extent y).
 	"lookahead update"
-	txt update.
+	txt process.
 	align := self getHAlign: offset.
 	txt position: offset  @ ( (self extent y - txt extent y ) >> 1).
 	
@@ -83,3 +72,14 @@ DiyaLabel >> update [
 	^ true
 	
 ]
+
+{ #category : #accessing }
+DiyaLabel >> txt [
+	^ txt
+]
+
+{ #category : #accessing }
+DiyaLabel >> txt: anObject [
+	txt data: anObject.
+	self setDirty
+]
diff --git a/Diya/DiyaLine.class.st b/Diya/DiyaLine.class.st
index 0f4a962..9d035b9 100644
--- a/Diya/DiyaLine.class.st
+++ b/Diya/DiyaLine.class.st
@@ -82,18 +82,7 @@ DiyaLine >> inner: aPoint [
 ]
 
 { #category : #accessing }
-DiyaLine >> to [
-	^ to
-]
-
-{ #category : #accessing }
-DiyaLine >> to: anObject [
-	to := anObject.
-	self setDirty
-]
-
-{ #category : #accessing }
-DiyaLine >> update [
+DiyaLine >> process [
 	|extent|
 	bbox := (Rectangle origin: from corner: to ).
 	bbox origin = translation ifFalse:[self position: bbox origin].
@@ -108,3 +97,14 @@ DiyaLine >> update [
 	} doWithIndex: [:e :i| vbuffer at: i put: e].
 	^true
 ]
+
+{ #category : #accessing }
+DiyaLine >> to [
+	^ to
+]
+
+{ #category : #accessing }
+DiyaLine >> to: anObject [
+	to := anObject.
+	self setDirty
+]
diff --git a/Diya/DiyaNode.class.st b/Diya/DiyaNode.class.st
index 8e11efb..5c3c6e5 100644
--- a/Diya/DiyaNode.class.st
+++ b/Diya/DiyaNode.class.st
@@ -57,7 +57,21 @@ DiyaNode >> addNode: node at: pos [
 	node position: pos.
 	children add: node.
 	node root: self root.
-	^ node
+	Transcript show:'Added node #', self id asString; cr.
+	^ node 
+]
+
+{ #category : #accessing }
+DiyaNode >> allChildren [
+	|nodes|
+	nodes := OrderedCollection new.
+	children ifNil: [ ^ nodes ].
+	children do:[:c|
+		nodes add: c.
+		c allChildren do:[:e| nodes add:e].
+	].
+	^nodes
+	
 ]
 
 { #category : #accessing }
@@ -148,6 +162,11 @@ DiyaNode >> position: anObject [
 	self updateTF.
 ]
 
+{ #category : #accessing }
+DiyaNode >> process [
+	^self subclassResponsibility 
+]
+
 { #category : #convenience }
 DiyaNode >> register: aBlock to: eventName [
 	|evtCode|
@@ -159,12 +178,13 @@ DiyaNode >> register: aBlock to: eventName [
 
 { #category : #accessing }
 DiyaNode >> render [
+	self step.
 	dirty ifTrue:[
-		dirty := self update not].
+		dirty := self process not].
 	shader ifNotNil: [self setUpShader].
 	self draw.
 	children ifNil: [ ^self ].
-	children do: [:c  | c render  ]. 
+	children do: [:c  | c render  ].
 ]
 
 { #category : #accessing }
@@ -241,6 +261,10 @@ DiyaNode >> shader: anObject [
 	shader := anObject
 ]
 
+{ #category : #stepping }
+DiyaNode >> step [
+]
+
 { #category : #accessing }
 DiyaNode >> styleName [
 	^ styleName
@@ -276,11 +300,6 @@ DiyaNode >> trigger: evt [
 	].
 ]
 
-{ #category : #accessing }
-DiyaNode >> update [
-	^self subclassResponsibility 
-]
-
 { #category : #accessing }
 DiyaNode >> updateTF [
 	self subclassResponsibility 
diff --git a/Diya/DiyaPolygon.class.st b/Diya/DiyaPolygon.class.st
index 8c9c92c..f4b4cb6 100644
--- a/Diya/DiyaPolygon.class.st
+++ b/Diya/DiyaPolygon.class.st
@@ -40,6 +40,16 @@ DiyaPolygon >> points: anObject [
 	self setDirty
 ]
 
+{ #category : #accessing }
+DiyaPolygon >> process [
+	bbox := self recFromPoints.
+	translation = bbox origin ifFalse:[ self position: bbox origin].
+	points := points collect:[:e | e - bbox origin].
+	bbox := self recFromPoints.
+	self calculateVertices.
+	^true
+]
+
 { #category : #accessing }
 DiyaPolygon >> recFromPoints [
 	|maxX maxY minX minY x y|
@@ -55,13 +65,3 @@ DiyaPolygon >> recFromPoints [
 	].
 	^ Rectangle origin: minX@minY corner: maxX @ maxY
 ]
-
-{ #category : #accessing }
-DiyaPolygon >> update [
-	bbox := self recFromPoints.
-	translation = bbox origin ifFalse:[ self position: bbox origin].
-	points := points collect:[:e | e - bbox origin].
-	bbox := self recFromPoints.
-	self calculateVertices.
-	^true
-]
diff --git a/Diya/DiyaRectangle.class.st b/Diya/DiyaRectangle.class.st
index df669f3..0ce9863 100644
--- a/Diya/DiyaRectangle.class.st
+++ b/Diya/DiyaRectangle.class.st
@@ -37,7 +37,7 @@ DiyaRectangle >> initialize [
 ]
 
 { #category : #accessing }
-DiyaRectangle >> update [
+DiyaRectangle >> process [
 	|extent|
 	extent := self extent.
 	{
diff --git a/Diya/DiyaRendererContext.class.st b/Diya/DiyaRendererContext.class.st
index 6945403..f83a4dc 100644
--- a/Diya/DiyaRendererContext.class.st
+++ b/Diya/DiyaRendererContext.class.st
@@ -8,7 +8,8 @@ Class {
 		'vao',
 		'texture0',
 		'projection',
-		'assets'
+		'assets',
+		'window'
 	],
 	#pools : [
 		'OpenGLConstants',
@@ -106,3 +107,13 @@ DiyaRendererContext >> vao [
 DiyaRendererContext >> vbo [
 	^ vbo
 ]
+
+{ #category : #accessing }
+DiyaRendererContext >> window [
+	^ window
+]
+
+{ #category : #accessing }
+DiyaRendererContext >> window: anObject [
+	window := anObject
+]
diff --git a/Diya/DiyaRootNode.class.st b/Diya/DiyaRootNode.class.st
index 66b52e5..a3bb469 100644
--- a/Diya/DiyaRootNode.class.st
+++ b/Diya/DiyaRootNode.class.st
@@ -43,7 +43,7 @@ DiyaRootNode >> isRoot [
 ]
 
 { #category : #initialization }
-DiyaRootNode >> update [
+DiyaRootNode >> process [
 	^true
 ]
 
diff --git a/Diya/DiyaText.class.st b/Diya/DiyaText.class.st
index 1bb889d..d6c7e96 100644
--- a/Diya/DiyaText.class.st
+++ b/Diya/DiyaText.class.st
@@ -200,6 +200,18 @@ DiyaText >> maxLineWidth [
 	^ maxLineWidth
 ]
 
+{ #category : #initialization }
+DiyaText >> process [
+	bbox ifNil: [ ^true ].
+	data ifNil:[^true].
+	data ifEmpty:[^true].
+	vbuffer ifNotNil: [vbuffer free].
+	vbuffer :=  FFIExternalArray externalNewType: GLfloat size: data size * 16.
+	vbuffer autoRelease.
+	self drawText.
+	^true
+]
+
 { #category : #accessing }
 DiyaText >> splitLines [
 	|line ret tex2D|
@@ -219,24 +231,12 @@ DiyaText >> texture [
 	texture ifNil: [ self initTexture ].
 	texheight = texture height ifFalse: [
 		texheight := texture height.
-		self update.
+		self process.
 		self setClean.
 	].
 	^texture
 ]
 
-{ #category : #initialization }
-DiyaText >> update [
-	bbox ifNil: [ ^true ].
-	data ifNil:[^true].
-	data ifEmpty:[^true].
-	vbuffer ifNotNil: [vbuffer free].
-	vbuffer :=  FFIExternalArray externalNewType: GLfloat size: data size * 16.
-	vbuffer autoRelease.
-	self drawText.
-	^true
-]
-
 { #category : #'menu messages' }
 DiyaText >> valign [
 	^ self ? #yAlign
diff --git a/Diya/OpenGLTexImage2D.class.st b/Diya/OpenGLTexImage2D.class.st
index 0643749..c993b2a 100644
--- a/Diya/OpenGLTexImage2D.class.st
+++ b/Diya/OpenGLTexImage2D.class.st
@@ -29,6 +29,11 @@ OpenGLTexImage2D >> border: anObject [
 	border := anObject
 ]
 
+{ #category : #accessing }
+OpenGLTexImage2D >> bytesSize [
+	^(width * height) << 2 
+]
+
 { #category : #accessing }
 OpenGLTexImage2D >> data [
 	^ data
diff --git a/Diya/SDL2.extension.st b/Diya/SDL2.extension.st
index e1b935f..5286218 100644
--- a/Diya/SDL2.extension.st
+++ b/Diya/SDL2.extension.st
@@ -6,6 +6,11 @@ SDL2 class >> SDLAllocFormat: pixel_format [
 	
 ]
 
+{ #category : #'*Diya' }
+SDL2 class >> SDLBlitSurface: src srcRect: srcrect dest: dst dstRect: dstrect [
+	^ self ffiCall: #(int SDL_UpperBlit(SDL_Surface* src,SDL_Rect* srcrect,SDL_Surface* dst,SDL_Rect* dstrect))
+]
+
 { #category : #'*Diya' }
 SDL2 class >> SDLClearError [
 	^ self ffiCall: #(void SDL_ClearError(void))