I'm using GeForce 6200. It seems strange, but I used D3D9/HLSL to implement the HW Shadowmap, just follow the NV's document, such as create a D3DFMT_D24S8 formated Depth texture when rendering the depth info under Light View space... when in windowed mode it works well and really faster than the common shadow map. But when in Full screen(not matter if using FSAA), the shadow rendering is wrong. I tried the debug mode to run it, but without any error info, just same as that in windowed mode, but the rendering result. Who can give me some hint?

That sample works well on my system. It means that my video card should have no problem.

I've seen some detail of that code, almost same as mine, just ...

For my application, from the running result, the problem seem to be that in fullscreen the D3DFMT_D24S8 Depth buffer didn't rendered.

My common shadowmap application(the code is simiar to HW shadowmap app) works well under fullscreen.

After I installed Windows Vista, The application runs well under it(with the default GeForce Display Driver provided by Microsoft) I don't know why