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win32: Use a dummy window to support delayed stage creation

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The Win32 backend now implements the create_context method which
creates a context and binds it to a 1x1 invisible window. That way
there will always be a context bound and the features can be retrieved
without creating the default stage. This reflects the changes in
1c6ffc8..b245d55 to the GLX backend.
This commit is contained in:
Neil Roberts
2010-01-20 16:41:25 +00:00
committed by Emmanuele Bassi
parent 479fdffc7d
commit ae188d203c
3 changed files with 198 additions and 82 deletions
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84
clutter/win32/clutter-stage-win32.c
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@ -384,66 +384,6 @@ clutter_stage_win32_get_window_class ()
return klass;
}
static gboolean
clutter_stage_win32_pixel_format_is_better (const PIXELFORMATDESCRIPTOR *pfa,
const PIXELFORMATDESCRIPTOR *pfb)
{
/* Always prefer a format with a stencil buffer */
if (pfa->cStencilBits == 0)
{
if (pfb->cStencilBits > 0)
return TRUE;
}
else if (pfb->cStencilBits == 0)
return FALSE;
/* Prefer a bigger color buffer */
if (pfb->cColorBits > pfa->cColorBits)
return TRUE;
else if (pfb->cColorBits < pfa->cColorBits)
return FALSE;
/* Prefer a bigger depth buffer */
return pfb->cDepthBits > pfa->cDepthBits;
}
static int
clutter_stage_win32_choose_pixel_format (HDC dc, PIXELFORMATDESCRIPTOR *pfd)
{
int i, num_formats, best_pf = 0;
PIXELFORMATDESCRIPTOR best_pfd;
num_formats = DescribePixelFormat (dc, 0, sizeof (best_pfd), NULL);
for (i = 1; i <= num_formats; i++)
{
memset (pfd, 0, sizeof (*pfd));
if (DescribePixelFormat (dc, i, sizeof (best_pfd), pfd)
/* Check whether this format is useable by Clutter */
&& ((pfd->dwFlags & (PFD_SUPPORT_OPENGL
| PFD_DRAW_TO_WINDOW
| PFD_DOUBLEBUFFER
| PFD_GENERIC_FORMAT))
== (PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER | PFD_DRAW_TO_WINDOW))
&& pfd->iPixelType == PFD_TYPE_RGBA
&& pfd->cColorBits >= 16 && pfd->cColorBits <= 32
&& pfd->cDepthBits >= 16 && pfd->cDepthBits <= 32
/* Check whether this is a better format than one we've
already found */
&& (best_pf == 0
|| clutter_stage_win32_pixel_format_is_better (&best_pfd, pfd)))
{
best_pf = i;
best_pfd = *pfd;
}
}
*pfd = best_pfd;
return best_pf;
}
static gboolean
clutter_stage_win32_realize (ClutterStageWindow *stage_window)
@ -452,6 +392,7 @@ clutter_stage_win32_realize (ClutterStageWindow *stage_window)
ClutterBackendWin32 *backend_win32;
PIXELFORMATDESCRIPTOR pfd;
int pf;
GError *error = NULL;
CLUTTER_NOTE (MISC, "Realizing main stage");
@ -518,23 +459,22 @@ clutter_stage_win32_realize (ClutterStageWindow *stage_window)
stage_win32->client_dc = GetDC (stage_win32->hwnd);
pf = clutter_stage_win32_choose_pixel_format (stage_win32->client_dc, &pfd);
if (pf == 0 || !SetPixelFormat (stage_win32->client_dc, pf, &pfd))
/* Create a context. This will be a no-op if we already have one */
if (!_clutter_backend_create_context (CLUTTER_BACKEND (backend_win32),
&error))
{
g_critical ("Unable to find suitable GL pixel format");
g_critical ("Unable to realize stage: %s", error->message);
g_error_free (error);
goto fail;
}
if (backend_win32->gl_context == NULL)
/* Use the same pixel format as the dummy DC */
pf = GetPixelFormat (backend_win32->dummy_dc);
DescribePixelFormat (backend_win32->dummy_dc, pf, sizeof (pfd), &pfd);
if (!SetPixelFormat (stage_win32->client_dc, pf, &pfd))
{
backend_win32->gl_context = wglCreateContext (stage_win32->client_dc);
if (backend_win32->gl_context == NULL)
{
g_critical ("Unable to create suitable GL context");
goto fail;
}
g_critical ("Unable to find suitable GL pixel format");
goto fail;
}
CLUTTER_NOTE (BACKEND, "Successfully realized stage");