XNA Rotate Texture 2D

Question

I'd like to rotate a Texture in XNA. I know I can rotate it when it is drawn, but I would like the Texture2D variable to be the rotated texture. Is there any way to do this?

Answer 1

Use RenderTarget, draw your texture rotated into the RenderTarget, take the texture and save it.

Answer 2

You should provide a new shader that manage texture coords rotation. As the HLSL code of the basiceffect is public, it should be pretty easy to add this behaviour.

Basic Effect HLSL code

Passing an angle parameter to the shader, the transform should be:

 newU = U*cos(alfa) - V*sin(alfa);
 newV = U*sin(alfa) + V*cos(alfa);