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Is Display Mode DirectX supports the same as Display Mode Windows OS supports?

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My application needs to run on old-hardware computer,such as Intel 810 chip.On the 810-chip computer,I can find 24-bit color in desktop settings.But In my DirectX application(developed in DX9.0b SDK),I only find 16-bit color.The display capacity is too poor to complete my work,though it can run. Is Display Mode DirectX supports the same as Display Mode Windows OS supports? Thank you!

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In this case the OS has modes that DX doesn't support. 3D chips don't support 24 bit rendering (IIRC there were one or two who did in the history of 3D chips) -- only 16 bit or 32 bit. In the case of that integrated chip only 16 bit is available (which is true for some other very old chips, like Voodoo3 and back). In some other cases, D3D has access to modes that the desktop doesn't (like 10 bits per component).

In short, yes, display modes and D3D modes are different. (In fact, the resolutions themselves may be different, not just colour depths.)

[Edited by - ET3D on May 8, 2006 12:30:02 AM]

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