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From Wojiech Lewandowski, Workaround for wglMakeCurrent bug in NVidia drivers by

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calling wglMakeCurrent twice.

This bug has been reported to NVidia, confirmed and fixed by NVidia but awaits verifiaction and release if a driver which fixes this bug.
This commit is contained in:
Robert Osfield 2008-05-28 16:14:08 +00:00
parent 3ca777f31e
commit 7c23951ee1
1 changed files with 25 additions and 0 deletions
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25
src/osgViewer/GraphicsWindowWin32.cpp
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@ -1657,6 +1657,31 @@ bool GraphicsWindowWin32::makeCurrentImplementation()
return false;
}
// 2008/05/12
// Workaround for Bugs in NVidia drivers for windows XP / multithreaded / dualview / multicore CPU
// affects GeForce 6x00, 7x00, 8x00 boards (others were not tested) driver versions 174.xx - 175.xx
// pre 174.xx had other issues so reverting is not an option (statitistics, fbo)
// drivers release 175.16 is the latest currently available
//
// When using OpenGL in threaded app ( main thread sets up context / renderer thread draws using it )
// first wglMakeCurrent seems to not work right and screw OpenGL context driver data:
// 1: succesive drawing shows a number of artifacts in TriangleStrips and TriangleFans
// 2: weird behaviour of FramBufferObjects (glGenFramebuffer generates already generated ids ...)
// Looks like repeating wglMakeCurrent call fixes all these issues
// wglMakeCurrent call can impact performance so I try to minimize number of
// wglMakeCurrent calls by checking current HDC and GL context
// and repeat wglMakeCurrent only when they change for current thread
if( ::wglGetCurrentDC() != _hdc ||
::wglGetCurrentContext() != _hglrc )
{
if (!::wglMakeCurrent(_hdc, _hglrc))
{
reportErrorForScreen("GraphicsWindowWin32::makeCurrentImplementation() - Unable to set current OpenGL rendering context", _traits->screenNum, ::GetLastError());
return false;
}
}
if (!::wglMakeCurrent(_hdc, _hglrc))
{
reportErrorForScreen("GraphicsWindowWin32::makeCurrentImplementation() - Unable to set current OpenGL rendering context", _traits->screenNum, ::GetLastError());