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From Laurens Voerman, "attached is OpenSceneGraph\src\osgViewer\GraphicsWindowWin32.cpp

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I've added the code to get the osgViewer working on windows displays
with less than 32 bit color. Only tested with 16 bit color."
This commit is contained in:
Robert Osfield 2007-04-06 14:36:59 +00:00
parent 31ac332b1f
commit 511bc9d571
1 changed files with 37 additions and 0 deletions
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37
src/osgViewer/GraphicsWindowWin32.cpp
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@ -232,6 +232,10 @@ class Win32WindowingSystem : public osg::GraphicsContext::WindowingSystemInterfa
// (0,0) is returned if screen is unknown
virtual void getScreenResolution( const osg::GraphicsContext::ScreenIdentifier& si, unsigned int& width, unsigned int& height );
// Return the bits per pixel of specified screen
// (0) is returned if screen is unknown
virtual void getScreenColorDepth( const osg::GraphicsContext::ScreenIdentifier& si, unsigned int& dmBitsPerPel );
// Set the resolution for given screen
virtual bool setScreenResolution( const osg::GraphicsContext::ScreenIdentifier& si, unsigned int width, unsigned int height );
@ -852,6 +856,21 @@ void Win32WindowingSystem::getScreenResolution( const osg::GraphicsContext::Scre
}
}
void Win32WindowingSystem::getScreenColorDepth( const osg::GraphicsContext::ScreenIdentifier& si, unsigned int& dmBitsPerPel )
{
DISPLAY_DEVICE displayDevice;
DEVMODE deviceMode;
if (getScreenInformation(si, displayDevice, deviceMode))
{
dmBitsPerPel = deviceMode.dmBitsPerPel;
}
else
{
dmBitsPerPel = 0;
}
}
bool Win32WindowingSystem::changeScreenSettings( const osg::GraphicsContext::ScreenIdentifier& si, DISPLAY_DEVICE& displayDevice, DEVMODE& deviceMode )
{
//
@ -1380,6 +1399,24 @@ bool GraphicsWindowWin32::setPixelFormat()
int pixelFormatIndex = ::ChooseMatchingPixelFormat(openGLContext.deviceContext(), _traits->screenNum, formatSpecs);
if (pixelFormatIndex<0)
{
unsigned int bpp;
Win32WindowingSystem::getInterface()->getScreenColorDepth(*_traits.get(), bpp);
if (bpp < 32) {
osg::notify(osg::INFO) << "GraphicsWindowWin32::setPixelFormat() - Display setting is not 32 bit colors, "
<< bpp
<< " bits per pixel on screen #"
<< _traits->screenNum
<< std::endl;
_traits->red = bpp / 4; //integer devide, determine minimum number of bits we will accept
_traits->green = bpp / 4;
_traits->blue = bpp / 4;
::PreparePixelFormatSpecifications(*_traits, formatSpecs, true);// try again with WGL_SWAP_METHOD_ARB
pixelFormatIndex = ::ChooseMatchingPixelFormat(openGLContext.deviceContext(), _traits->screenNum, formatSpecs);
}
}
if (pixelFormatIndex<0)
{
::PreparePixelFormatSpecifications(*_traits, formatSpecs, false);
pixelFormatIndex = ::ChooseMatchingPixelFormat(openGLContext.deviceContext(), _traits->screenNum, formatSpecs);