DirectX 9 Bug

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TaskMaster

(Posted 2009) [#1]

I do not know whether this is a MaxGUI bug or just a BlitzMax bug as a whole.

But, I make a window with a canvas on it and draw an image. When I resize the window I set the ViewPort and the VirtualResolution to the size of the canvas, so my graphic stays the same.

This works in OpenGL and DX7, but in DX9 it seems that the virtual resolution get off just slightly and make the image a little blurry.

Here is some sample code. Load your own image in place of pic.jpg.

Resize the window by dragging its edge. The graphic should not change.

But if you comment out the OGL driver and enable the DX9 driver, you will see the image get blurry when you resize the window. You can also try the DX7 driver, which also works.

SuperStrict

Import maxgui.drivers

SetGraphicsDriver GLMax2DDriver()
'SetGraphicsDriver D3D7Max2DDriver()
'SetGraphicsDriver D3D9Max2DDriver()

Global GWindow:TGadget = CreateWindow("Test", 10, 10, 800, 600, Null, WINDOW_TITLEBAR | WINDOW_RESIZABLE | WINDOW_CLIENTCOORDS | WINDOW_CENTER)
Global GCanvas:TGadget = CreateCanvas(0, 0, GWindow.ClientWidth(), GWindow.ClientHeight(), GWindow)
GCanvas.SetLayout(EDGE_ALIGNED, EDGE_ALIGNED, EDGE_ALIGNED, EDGE_ALIGNED)
ActivateGadget(GWindow)
SetGraphics(CanvasGraphics(GCanvas))

AddHook (EmitEventHook, MyHook)
CreateTimer(60)

SetClsColor(200, 200, 200)
Global img:TImage = LoadImage("pic.jpg")

Repeat
	WaitEvent()
Forever

Function Refresh()
	Cls
	DrawImage(img, 10, 10)
	Flip 0
End Function

Function ResizeWindow()
	SetGraphics(CanvasGraphics(GCanvas))
	SetViewport(0, 0, GCanvas.width, GCanvas.height)
	SetVirtualResolution(GCanvas.width, GCanvas.height)
End Function

Function MyHook:Object(iId:Int, TData:Object, tContext:Object)
	Local event:TEvent = TEvent(TData)
	Select event.id
		Case EVENT_GADGETPAINT
			If event.source = GCanvas
				Refresh()
				Return Null
			End If
		Case EVENT_TIMERTICK
			Refresh()
			Return Null
		Case EVENT_WINDOWSIZE
			ResizeWindow()
		Case EVENT_WINDOWCLOSE
			If event.source = GWindow End
	End Select
	Return TData
End Function

degac

(Posted 2009) [#2]

'Bug' confirmed, but in my case the image is not 'blurred' but as here

The original image is the BlitzMax logo

jsp	(Posted 2009) [#3]

I encounter the same problem and with the standard drawing commands (DrawLine, DrawRect...) it's much worse than with a picture!
While DX7 looks ok for a first test, OGL seems to have also a problem with a virtual resolution different than 1:1 all linewidths look like set to 1.