Question

I’ve got a dialog that I’d basically like to implement as a texture viewer using DirectX. The source texture can either come from a file on-disk or from an arbitrary D3D texture/surface in memory. The window will be resizable, so I’ll need to be able to scale its contents accordingly (preserving aspect ratio, while not necessary, would be useful to know).

What would be the best way to go about implementing the above?

Answer 1

IMHO the easiest way to do this is to create a quad (or two triangles) whose vertices contain the correct UV-coordinates. The XYZ coordinates you set to the viewing cube coordinates. This only works if the identity matrix is set as projection. You can use -1 to 1 on both X and Y axes.

EDIT: Here an example turorial:

• http://www.mvps.org/directx/articles/splash_screen.htm