Irrlicht Engine

hey all

I'm using addImage to make my game's menu screen, but in the game, my images looks distorted? how can i make it work? with the original image quality?

I think the dimension of the image is wrong...
It must be in power of 2 (2^0, 2^1, 2^2, 2^3, 2^4, ...) !!!
So be sure the dimensions are correct (for example 512 x 512) ...

thank you
it worked
i didn't know that

yeah, it's a common error and asked many times here...
A search on the forum probably helped you quicker...

addImage uses the original dimension of the texture though, right ?
So even if the image is not a power of 2 it should work... a priori.. ?

eneru wrote:addImage uses the original dimension of the texture though, right ?
So even if the image is not a power of 2 it should work... a priori.. ?

That image still has to be sent to your video card, which will get angry at non-power of two images and distort them. There are some video cards out there that handle non-power of 2, but most don't. Basically what this means is this really isn't Irrlicht's fault at all. The closest thing to a fix would be for Irrlicht to determine the closest power of 2 resolution and resample everything.

Dances wrote:The closest thing to a fix would be for Irrlicht to determine the closest power of 2 resolution and resample everything.

AFAIK this is exactly what happens by the graphics card...
the image will be scaled to the next power of 2...
this is the reason why the image looks bad afterwards...

If you use an ITexture you can check if it's scaled with getSize() and getOriginalSize() !!!

So, if for example I want to do a image for filling the whole screen (1680x1060, in my case) I'd have to make tiny images that are power of two?

And, why in SDL I can load up that same image and it looks perfect?

Sure they're different things, but there is some way for loading images that they're size isn't a power of 2?

Thanks.

you could load it in to system ram as an image, split into (for example) 256x256 tiles, turn them in to textures and only draw the visible sections

You could also make the image higher than the required resolution. Formats like PNG are really forgiving on large amounts of black or white space.