wglCreateLayerContext implemented on WINDOWS?

OpenGL
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Hi All,
I am just wondering if wglCreateLayerContext is implemented on Windows.

I tried to created an overlay plane, but I got an ‘incorrect parameter’ error.

Thanks for any input!

WJ

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Originally posted by wyu:
[b]Hi All,
I am just wondering if wglCreateLayerContext is implemented on Windows.

I tried to created an overlay plane, but I got an ‘incorrect parameter’ error.

Thanks for any input!

WJ[/b]
Check if your graphics card supports overlay planes in OpenGL.

The number of overlay and underlay planes is given in the bReserved member of the PIXELFORMATDESCRIPTOR structure.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/opengl/ntopnglr_1awk.asp

bReserved
Specifies the number of overlay and underlay planes. Bits 0 through 3 specify up to 15 overlay planes and bits 4 through 7 specify up to 15 underlay planes.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/opengl/ntopnglr_73jm.asp

Normally “gaming” graphics cards (eg geForce, Radeon) have overlay support disabled and that support is only enabled in the “workstation” version of the cards (eg Quadro, FireGL).

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