[D3D9] making D3DXFont resolution independent

The D3DX font works by rendering the glyphs to a texture (during initialization), and rendering quads with that texture when you draw some text with it. This is basically the same strategy that Win32 font system uses under the hood, for small text sizes.

It is possible to render vector fonts by using purpose-built shaders, but D3DX does not have a helper class for this.

The performance tends to be better if you use a bitmap cache. However, newer hardware tends to have more arithmetic headroom (because texture memory bandwidth does not increase very fast), so direct vector rendering is becoming relatively faster.

The D3DX font works by rendering the glyphs to a texture (during initialization), and rendering quads with that texture when you draw some text with it. This is basically the same strategy that Win32 font system uses under the hood, for small text sizes.

It is possible to render vector fonts by using purpose-built shaders, but D3DX does not have a helper class for this.

The performance tends to be better if you use a bitmap cache. However, newer hardware tends to have more arithmetic headroom (because texture memory bandwidth does not increase very fast), so direct vector rendering is becoming relatively faster.

What if I don't want to use vector fonts? Then I have to recreate the D3DX font with a new font size after resizing the screen, isn't it true?

Yes.

Bitmap cache (D3DX & texture approach) is intrinsically fixed to the size it was created in.

Yes.

Bitmap cache (D3DX & texture approach) is intrinsically fixed to the size it was created in.

OK.
Thanks!