Texel size when rendering a sprite with a shader

[dydya-stepa]

i'm rendering a sprite into window like this:

window.Draw(sprite, shader)

My window's size is 800*600 but my sprite's size is 1024*1024. I'm rendering it with some offset so only portion is shown. The shader (blur) needs texel size which is 1 / width for horizontal and 1 / height per vertical.

So the question is what the width and height should be equal to?

[Laurent]

It must be equal to the sprite's texture width/height.

Code: [Select]

shader.SetParameter("width", sprite.GetTexture()->GetWidth());
shader.SetParameter("height", sprite.GetTexture()->GetHeight());