I had noticed on some (and only some) gfx cards under vista, the screen would
update at sparatic intervals or not update at all within gtkglext opengl
surface on windows 7 rc and vista when dwm/compositing was enabled (aero
effects). I decided to look into this, though unfortunately I don't have any
of the machines with the fault available to me. My speculation however, was
the lack of a PFD_SUPPORT_COMPOSITION flag
(http://www.opengl.org/pipeline/article/vol003_7/). I've updated
gdkglconfig_win32.c to detect composition and add the flag via two code
segments below (sorry I didn't bother generating a patch file)
If anyone else was experiencing this bug, please email me to test my solution.
~mike
//mlf
typedef HRESULT (*PDWMISCOMP)(BOOL *);
static PDWMISCOMP is_comp;
static HMODULE hmod_dwmapi = NULL;
static gboolean no_dwm_api = FALSE;
//more by mlf
#ifndef PFD_SUPPORT_COMPOSITION
#define PFD_SUPPORT_COMPOSITION 0x00008000
#endif
//mlf
static gboolean dwm_aero_on()
{
if(!hmod_dwmapi && !no_dwm_api)
{
HMODULE hmod = LoadLibrary("dwmapi.dll");
if(!hmod)
no_dwm_api = TRUE;
is_comp = (PDWMISCOMP)GetProcAddress(hmod, "DwmIsCompositionEnabled");
if(!is_comp)
no_dwm_api = TRUE;
}
if(hmod_dwmapi && is_comp)
{
BOOL e;
is_comp(&e);
return (e) ? TRUE : FALSE;
}
return FALSE;
}
//.........and the change in the parse attrib list routine
//fix this thing to work with aero
if(dwm_aero_on())
{
pfd->dwFlags = PFD_SUPPORT_OPENGL |
PFD_SUPPORT_COMPOSITION;
}
else
{
pfd->dwFlags = PFD_SUPPORT_OPENGL |
PFD_SUPPORT_GDI;
}
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