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DirectX Colors Failed!!!

I tried to query the primary surface for DirectDraw ColorControls:

LPDIRECTDRAWCOLORCONTROL lpColorControl;
LPDIRECTDRAWSURFACE7 lpPrimary;

lpPrimary->QueryInterface(IID_IDirectDrawCOlorControl, (VOID**)&lpColorControl);

So my error is that the query interface fails! meaning there is no interface...
How is that possible when it is a omnipresent capability in each video card?
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volcano79
Asked:
volcano79
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1 Solution
 
GlennDeanCommented:
I would get the HRESULT return code from QI and then use FormatMessage to see exactly why it failed.
   Glenn
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nils pipenbrinckCommented:
your code is correct.

your driver simply doesn't implement this feature.. even if your vga might support the stuff.

So.. bad luck for you.

(btw. I wonder how a vga card should implement the saturation/hue settings.. that sound like a lot of video postprocessing for me).

Nils

P.S. 10 point question, 10 point answer :)
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volcano79Author Commented:
My card is RIVA TNT, generation one, with nVidia chip in it. Hence, my driver is also nVidia one. And I suppose it is a reputable one to include such a feature inside? Could it be the card's problem rather than the driver problem?
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nils pipenbrinckCommented:
I also have a RIVA TNT in my machine at home (and a TNT2 here at the office). The drivers are great. They support most of the DirectX and Direct3D features, but not all.

Gamma and Color Control are two of them. Other features that are not supported are for example DDraw Blitting with Win32 ROP operations and other rarely used stuff.

Again.. I'm pretty sure that your code would work if your driver would support the ColorControl interface. The TNT hardware however is not able to change the hue or saturation of the output signal... Gamma is theoretical possible because the gdi drivers support it.

Nils
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