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DrawPoint issue on Desktop (GLFW) on Windows

Monkey Forums/Monkey Bug Reports/DrawPoint issue on Desktop (GLFW) on Windows

Powelly(Posted 2014) [#1]
I have an issue with DrawPoint on the Desktop target.
To demonstrate the issue I have written the following small program:

Strict

Import mojo

Function Main:Int()
	New TestApp()
	Return 0
End

Class TestApp Extends App
	Method OnCreate:Int()
		SetUpdateRate(60)
	
		Return 0
	End
	
	Method OnRender:Int()
		Cls(0, 0, 0)
		SetColor(255, 0, 0)
		
		For Local x:Int = 0 Until 640
			For Local y:Int = 0 Until 480
				DrawPoint(x, y)
			Next
		Next
	
		Return 0
	End
End


On all targets that I've tried, except Desktop, you get a rectangular red block on the screen, as expected.

On the Desktop target the left third of the window is fine, but on the right two-thirds you get irregular vertical banding showing the background colour.


marksibly(Posted 2014) [#2]
What Host OS?

It works fine here, on my Windows 7 GTX 460 setup.


Goodlookinguy(Posted 2014) [#3]
@Powelly To Fix it...
Change
DrawPoint(x, y)

to
DrawPoint(x+0.5, y+0.5)


@mark Here's an image of the problem


I wrote a bug report nearly a year ago talking about the inconsistency of DrawPoint and DrawLine.


marksibly(Posted 2014) [#4]
What OS? Graphics card?


Goodlookinguy(Posted 2014) [#5]
Windows 7 and my signature has all of the information you could ever want about my computer and its video card.


marksibly(Posted 2014) [#6]
> my signature has all of the information you could ever want about my computer and its video card.

...and, with sigs turn on, I can even see it!

This is not happening to me on either PC or Mac though. I'll have a play around and try to see what's going on.


marksibly(Posted 2014) [#7]
Ok, give experimental v79a a whirl.

I wasn't able to reproduce the above, but the code below caused problems.

It now does what it should on all tested targets (haven't got round to PSM yet), although I've just noticed that html5 exhibits a minor flicker, meaning point/line code is not identical. Will investigate this later.

Import mojo

Function Main()
	New TestApp
End

Class TestApp Extends App

	Method OnCreate()
		SetUpdateRate 60
	End
	
	Field t:Bool
	
	Method OnRender()
	
		Cls 0,0,255
		
		SetColor 255,0,0

		Local w:=DeviceWidth-1
		Local h:=DeviceHeight-1
		
		t=Not t
		
		If t
			For Local x:=0 To w
				DrawPoint x,0
				DrawPoint x,h
			Next
			
			For Local y:=0 To h
				DrawPoint 0,y
				DrawPoint w,y
			Next
		Else
				
			DrawLine 0,0,w,0
			DrawLine 0,0,0,h
			DrawLine w,0,w,h
			DrawLine 0,h,w,h
		Endif
				
		SetColor 0,0,0
		
		DrawRect 1,1,w-1,h-1
	End
End



Powelly(Posted 2014) [#8]
I had the issue on a Desktop with Windows 7 64bit with an AMD Radeon R9 270, and also on a laptop with Windows 7 64bit with an AMD A10-5750M APU containing a Radeon HD 8650G GPU. I've not tested on a machine with an nVidia GPU, but I can do if it helps.


Powelly(Posted 2014) [#9]
I've checked v79a and everything looks good. Thanks :-)