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D3D Stencil buffer

Started by bob_bubba77 Dec 30, 2003 at 10:30 PM 0 replies 300+ views

Original Post

Dec 30, 2003 at 10:30 PM

hi, I''m using the DX9 sdk. I''d like to know if the values in the stencil buffer are signed or not. (is this device dependant?) I''d also like to know if the Z test is performed before or after the stencil test. (does it even matter?) I''m currently playing around with volume shadows, and I haven''t been able to find the answer to these questions in the sdk doc. I''ve also looked in the DirectX Caps Viewer, and I can see that my adaptor supports D3DFMT_D24S8 for example, but the documentation doesn''t specify if those 8 bit of stencil buffer are signed or not. thanks.

jacklin

Jan 1, 2004 at 8:03 PM

Stencil buffer values are unsigned. When rendering, stencil test is performed, then depth test is performed.

For shadow volumes, the order in which the tests are performed does not matter. When you render the shadow volume, you always pass the stencil test and update stencil values based on the result of the depth test.

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