NewsForumsCodeLogsGallerySpecsSearch

Code archives/Graphics/DX UV wrap

This code has been declared by its author to be Public Domain code.

Download source code

DX UV wrap by tonyg2006
Will wrap a texture depending on the UV settings rather than clamp it to the surface size. 
Strict
Graphics 800,600
Cls
Function tg_setuv(image:TImage,u0#,v0#,u1#,v1#,frame:Int=0)
  TD3D7ImageFrame(image.frame(frame)).SetUV(u0#,v0#,u1#,v1#)
End Function
Function tg_resetuv(image:TImage,frame:Int=0)
    TD3D7ImageFrame(image.frame(frame)).SetUV(0.0,0.0,1.0,1.0)
End Function
Local base:Timage = LoadImage("max.png")
Local u0#			= 0
Local v0#			= 0
Local u1#			= 0.5
Local v1#			= 1
Local frame:Byte	 = 0
Local wrap_u0# = 0.0
Local wrap_v0#			= 0.0
Local wrap_u1#			= 2.0
Local wrap_v1#			= 2.0
While Not KeyHit(KEY_ESCAPE)
	Cls
	tg_SetUV(base,u0#,v0#,u1#,v1#)
	DrawImage(base,0,0)
	setwrap()
	tg_SETUV(base,wrap_u0#,wrap_v0#,wrap_u1#,wrap_v1#)
	DrawImage base , 400 , 0
	tg_resetuv(base)
	setnowrap()
	DrawImage base , 0 , 200
	Flip
Wend
Function setwrap()
	PrimaryDevice.device.SetTextureStageState( 0, D3DTSS_ADDRESS,	D3DTADDRESS_WRAP);
End Function
Function setnowrap()
	PrimaryDevice.device.SetTextureStageState( 0 , D3DTSS_ADDRESS , 	D3DTADDRESS_CLAMP) ; 
End Function

Comments

tonyg2006
Seems to work OK but there was no feedback from the person who asked for it so I can only assume it worked.


Jake L.2006
Oh, that's me ;)
Sorry, tonyg, I thought my answer counts as "works great".

So: it works like a charm and you really helped me with this! Big Thanx!


tonyg2006
No problem Jake.
I just worry that me running it a few times and somebody using it for real are two different things.


Yan2006
It's probably worth mentioning that this'll only work with pow2 images.

[edit]
As most people would probably expect it to, at least.
[/edit]


H&K2006
lol,

Yea Tony, were's your code to make sure its a Pow 2 image. Slacker ;)


tonyg2006
Is there a problem with a non-pow2 texture? Does Bmax handle that on load as I don't get a problem with a non-pow2 image?


Yan2006
When BMax loads an image it scales the texture up to the nearest power of two and blits the pixmap into the top left corner.

This means that the bottom right of the image isn't necessarily at UV coords 1,1 and the texture, when wrapped, will show the 'empty' part of the texture.

I don't know OGL or DX well enough to know whether it's possible to set a 'window' on the texture for wrapping. You could just make a new DrawWrappedImage command that scrolled the verts and UVs of a 2x2 quad around, I suppose. I didn't bother as the pow2 limitation was fine for my purposes.

I thought I'd just mention this as people may be expecting the wrap to occur at the image boundary rather than the texture boundary.


tonyg2006
Sorry, I understand what everybody's getting out now. Yep, there'll be spaces between the 'wraps' if it's not pow2.
For some reason I thought people were saying it was not working for non-pow2.
I suppose I could rescale to nearest pow2 but it could have horrible results. Anyway, people can mess about as theyt see fit.


Yan2006
Yeah, sorry about that, my first post wasn't at all clear, even with the edit. :o/

It's a gift... ;o)


Code Archives Forum