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gdkglcontext-win32.c: Fix running with Mesa drivers

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Some GL drivers such as Mesa-D3D12 do not allow one to call SetPixelFormat() on
a given HDC if one pixel format has been already set for it, so first check the
HDC with GetPixelFormat() to see whether a pixel format has already been set
with the HDC, and only attempt to acquire the pixel format if one has not been
set.

This will fix running with GL/NGL on Windows using the Mesa drivers.
This commit is contained in:
Chun-wei Fan 2021-04-29 12:04:42 +08:00
parent 604d171d56
commit 66e7f3b404
1 changed files with 18 additions and 8 deletions
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26
gdk/win32/gdkglcontext-win32.c
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@ -712,20 +712,30 @@ _set_pixformat_for_hdc (HDC hdc,
int *best_idx,
GdkWin32Display *display)
{
PIXELFORMATDESCRIPTOR pfd;
gboolean set_pixel_format_result = FALSE;
gboolean already_checked = TRUE;
*best_idx = GetPixelFormat (hdc);
/* one is only allowed to call SetPixelFormat(), and so ChoosePixelFormat()
* one single time per window HDC
*/
*best_idx = _get_wgl_pfd (hdc, &pfd, display);
if (*best_idx == 0)
{
PIXELFORMATDESCRIPTOR pfd;
gboolean set_pixel_format_result = FALSE;
if (*best_idx != 0)
set_pixel_format_result = SetPixelFormat (hdc, *best_idx, &pfd);
GDK_NOTE (OPENGL, g_print ("requesting pixel format...\n"));
already_checked = FALSE;
*best_idx = _get_wgl_pfd (hdc, &pfd, display);
/* ChoosePixelFormat() or SetPixelFormat() failed, bail out */
if (*best_idx == 0 || !set_pixel_format_result)
return FALSE;
if (*best_idx != 0)
set_pixel_format_result = SetPixelFormat (hdc, *best_idx, &pfd);
/* ChoosePixelFormat() or SetPixelFormat() failed, bail out */
if (*best_idx == 0 || !set_pixel_format_result)
return FALSE;
}
GDK_NOTE (OPENGL, g_print ("%s""requested and set pixel format: %d\n", already_checked ? "already " : "", *best_idx));
return TRUE;
}