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Thread: GUI menu redraw & dropshadow problems with dualhead setup

  1. #1

    Default GUI menu redraw & dropshadow problems with dualhead setup

    Thought I'd mention this here also. There is a problem with the GUI menus and dropshadows on all variants of windows and ATI cards. The problem is that the contents of a menu window are drawn, then cleared immediately (it blinks), leaving only the window shadow there, with the menu contents missing. After moving the mouse over the menu window or moving with the keyboard, the contents of the window are drawn as they should.

    On XP this problem manifests all the time, and ClanLib already deals with it on XP by disabling the dropshadow window style. On Vista and 7 it only manifests on the seconds screen, and sometimes it even works as it should. A window with problems on the second screen can be dragged to the primary screen, and the problem is gone - move it back to second screen and the rendering breaks again.

    Removing the dropshadow seems to fix the problem, but that's not a good solution as very few are affected by this problem.

  2. #2
    ClanLib Developer
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    May 2007
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    A hacky solution would be to have the CS_DROPSHADOW style configurable in your app, and the default uses the autodetection of a ATI graphics card.

    Google "OpenGL CS_DROPSHADOW" gave http://www.opengl.org/discussion_boa...&Number=245005 , but that doesn't help.

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