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vertex processing in direct3d

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i heard that for maximum compatibility i shoud use D3DCREATE_SOFTWARE_VERTEXPROCESSING when creating a device in direct3d Is that right ? is there a way to test if the hardware is able to perform hardware processing, so i could use the flag D3DCREATE_HARDWARE_VERTEXPROCESSING i am a little bit lost.....

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Yes, before you create the device, call:
with the adapter (often D3DADAPTER_DEFAULT) and device type (almost always D3DDEVTYPE_HAL), and a pointer to a D3DCAPS8 struct.

Then, check:

if it's greater than 0 (ie it's true), then the device supports transform and lighting in hardware, and you can use the D3DCREATE_HARDWARE_VERTEXPROCESSING flag when you create the device. If it's 0 (ie false) then you've got to use software vertex processing.

On a more general note, you should always check the caps flags before using features that you aren't certain will be supported (in fact, you should always check the caps and dump out gracefully if the card you're running on doesn't support a feature that you really need).

Hope that helps,

John B

[edited by - JohnBSmall on November 9, 2002 8:10:36 AM]

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