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From Laurens Voerman, "Attached is a version of src\osgViewer\GraphicsWindowWin32.cpp that

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allows to render in software. (maybe also in hardware w/o
wglChoosePixelFormatARB)"
This commit is contained in:
Robert Osfield
2007-05-15 19:25:57 +00:00
parent 1e0af35900
commit e8cf7b22ad
1 changed files with 40 additions and 6 deletions
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46
src/osgViewer/GraphicsWindowWin32.cpp
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@@ -1351,7 +1351,7 @@ static void PreparePixelFormatSpecifications( const osg::GraphicsContext::Traits
attributes.end();
}
static int ChooseMatchingPixelFormat( HDC hdc, int screenNum, const WGLIntegerAttributes& formatSpecifications )
static int ChooseMatchingPixelFormat( HDC hdc, int screenNum, const WGLIntegerAttributes& formatSpecifications ,osg::GraphicsContext::Traits* _traits)
{
//
// Access the entry point for the wglChoosePixelFormatARB function
@@ -1360,8 +1360,41 @@ static int ChooseMatchingPixelFormat( HDC hdc, int screenNum, const WGLIntegerAt
WGLChoosePixelFormatARB wglChoosePixelFormatARB = (WGLChoosePixelFormatARB)wglGetProcAddress("wglChoosePixelFormatARB");
if (wglChoosePixelFormatARB==0)
{
reportErrorForScreen("ChooseMatchingPixelFormat() - wglChoosePixelFormatARB extension not found", screenNum, ::GetLastError());
return -1;
// = openGLContext.getTraits()
reportErrorForScreen("ChooseMatchingPixelFormat() - wglChoosePixelFormatARB extension not found, trying GDI", screenNum, ::GetLastError());
PIXELFORMATDESCRIPTOR pixelFormat = {
sizeof(PIXELFORMATDESCRIPTOR), // size of this pfd
1, // version number
PFD_DRAW_TO_WINDOW | // support window
PFD_SUPPORT_OPENGL | // support OpenGL
(_traits->doubleBuffer ? PFD_DOUBLEBUFFER : NULL), // double buffered ?
PFD_TYPE_RGBA, // RGBA type
_traits->red + _traits->green + _traits->blue, // color depth
_traits->red ,0, _traits->green ,0, _traits->blue, 0, // shift bits ignored
_traits->alpha, // alpha buffer ?
0, // shift bit ignored
0, // no accumulation buffer
0, 0, 0, 0, // accum bits ignored
_traits->depth, // 32 or 16 bit z-buffer ?
_traits->stencil, // stencil buffer ?
0, // no auxiliary buffer
PFD_MAIN_PLANE, // main layer
0, // reserved
0, 0, 0 // layer masks ignored
};
int pixelFormatIndex = ::ChoosePixelFormat(hdc, &pixelFormat);
if (pixelFormatIndex == 0)
{
reportErrorForScreen("ChooseMatchingPixelFormat() - GDI ChoosePixelFormat Failed.", screenNum, ::GetLastError());
return -1;
}
::DescribePixelFormat(hdc, pixelFormatIndex ,sizeof(PIXELFORMATDESCRIPTOR),&pixelFormat);
if (((pixelFormat.dwFlags & PFD_GENERIC_FORMAT) != 0) && ((pixelFormat.dwFlags & PFD_GENERIC_ACCELERATED) == 0))
{
osg::notify(osg::WARN) << "Rendering in software: pixelFormatIndex " << pixelFormatIndex << std::endl;
}
return pixelFormatIndex;
}
int pixelFormatIndex = 0;
@@ -1397,7 +1430,8 @@ bool GraphicsWindowWin32::setPixelFormat()
// Choose the closest matching pixel format from the specified traits
//
int pixelFormatIndex = ::ChooseMatchingPixelFormat(openGLContext.deviceContext(), _traits->screenNum, formatSpecs);
int pixelFormatIndex = ::ChooseMatchingPixelFormat(openGLContext.deviceContext(), _traits->screenNum, formatSpecs,_traits.get());
if (pixelFormatIndex<0)
{
unsigned int bpp;
@@ -1413,13 +1447,13 @@ bool GraphicsWindowWin32::setPixelFormat()
_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);
pixelFormatIndex = ::ChooseMatchingPixelFormat(openGLContext.deviceContext(), _traits->screenNum, formatSpecs,_traits.get());
}
}
if (pixelFormatIndex<0)
{
::PreparePixelFormatSpecifications(*_traits, formatSpecs, false);
pixelFormatIndex = ::ChooseMatchingPixelFormat(openGLContext.deviceContext(), _traits->screenNum, formatSpecs);
pixelFormatIndex = ::ChooseMatchingPixelFormat(openGLContext.deviceContext(), _traits->screenNum, formatSpecs,_traits.get());
if (pixelFormatIndex<0)
{
reportErrorForScreen("GraphicsWindowWin32::setPixelFormat() - No matching pixel format found based on traits specified", _traits->screenNum, 0);