White flash when creating an OpenGL render context on Windows

Question

I'm creating an OpenGL render context on Windows, using ChoosePixelFormat, SetPixelFormat, etc. This all works beautifully, however, just before the OpenGL content is drawn, the window is set to all white. Briefly, but still visible.

The background brush on the window class is GetStockObject(HOLLOW_BRUSH), I do not respond to either WM_ERASEBKGND or WM_PAINT, and the OpenGL context is cleared with black immediately. This all doesn't seem to matter.

I can also reproduce this problem if I turn off the OpenGL render loop temporarily while running, hide and then show the window. This makes it completely white.

It looks like Windows is clearing the window if it is set as an OpenGL render target, and it's using white for this. Is this a known issue and is there any way to control the default color? Black would be much better. Thanks!

(Using Windows 7 with an ATI Radeon HD5750 adapter.)

Does the window also flicker with white flashes when you resize it? — Kristian Duske, Apr 26 '12 at 14:43
I am asking because white flashes on resize happened to me when I had forgotten to set my OpenGL context to use double buffering. Could this be the issue? — Kristian Duske, Apr 26 '12 at 15:06

score 0 · Answer 1 · answered Dec 13 '12 at 16:54

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I had this problem too. I had to handle the WM_ERASEBKGND message by doing nothing and returning true to prevent the white flicker.

answered Dec 13 '12 at 16:54

Tim

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score 0 · Accepted Answer · answered Dec 14 '12 at 13:37

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The solution for me was to draw something when the first WM_PAINT message arrives.

answered Dec 14 '12 at 13:37

Frederik Slijkerman

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White flash when creating an OpenGL render context on Windows

2 Answers2

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