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GDK/Win32: Use dummy WGL contexts more

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... for creating the actual WGL contexts, so that we can cut down on the
number of times where we need to create the base, legacy WGL contexts in
order to create the WGL contexts with attributes.  We could just use the
dummy context that we have to make it current to create the needed
WGL contexts.
This commit is contained in:
Chun-wei Fan 2023-05-05 00:09:43 +08:00
parent 50ef36d387
commit a7b09e19f1
1 changed files with 66 additions and 26 deletions
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92
gdk/win32/gdkglcontext-win32-wgl.c
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@ -430,7 +430,6 @@ ensure_legacy_wgl_context (HDC hdc,
static HGLRC
create_wgl_context_with_attribs (HDC hdc,
HGLRC hglrc_base,
GdkGLContext *share,
int flags,
gboolean is_legacy,
@ -484,36 +483,63 @@ create_wgl_context_with_attribs (HDC hdc,
}
static HGLRC
create_wgl_context (GdkGLContext *context,
HDC hdc,
gboolean hasWglARBCreateContext,
GdkGLContext *share,
int flags,
gboolean legacy,
GError **error)
create_base_wgl_context (GdkWin32Display *display_win32,
HDC hdc,
gboolean force_create_base_context,
gboolean *remove_base_context)
{
/* We need a legacy context for *all* cases */
HGLRC hglrc_base = NULL;
if (force_create_base_context || display_win32->dummy_context_wgl.hglrc == NULL)
{
hglrc_base = wglCreateContext (hdc);
if (hglrc_base == NULL)
return NULL;
*remove_base_context = !force_create_base_context;
}
else
hglrc_base = display_win32->dummy_context_wgl.hglrc;
return hglrc_base;
}
static HGLRC
create_wgl_context (GdkGLContext *context,
GdkWin32Display *display_win32,
HDC hdc,
GdkGLContext *share,
int flags,
gboolean legacy,
GError **error)
{
/* We need a legacy context for *all* cases, if no WGL contexts are created */
HGLRC hglrc_base, hglrc;
GdkGLVersion version;
gboolean remove_base_context = FALSE;
/* Save up the HDC and HGLRC that we are currently using, to restore back to it when we are done here */
HDC hdc_current = wglGetCurrentDC ();
HGLRC hglrc_current = wglGetCurrentContext ();
hglrc_base = wglCreateContext (hdc);
if (hglrc_base == NULL ||
!wglMakeCurrent (hdc, hglrc_base))
{
g_clear_pointer (&hglrc_base, gdk_win32_private_wglDeleteContext);
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
return 0;
}
hglrc = NULL;
if (hasWglARBCreateContext)
if (display_win32->hasWglARBCreateContext)
{
hglrc_base = create_base_wgl_context (display_win32,
hdc,
FALSE,
&remove_base_context);
if (hglrc_base == NULL || !wglMakeCurrent (hdc, hglrc_base))
{
g_clear_pointer (&hglrc_base, gdk_win32_private_wglDeleteContext);
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
return 0;
}
if (!legacy)
{
gdk_gl_context_get_matching_version (context,
@ -521,7 +547,6 @@ create_wgl_context (GdkGLContext *context,
FALSE,
&version);
hglrc = create_wgl_context_with_attribs (hdc,
hglrc_base,
share,
flags,
FALSE,
@ -535,7 +560,6 @@ create_wgl_context (GdkGLContext *context,
TRUE,
&version);
hglrc = create_wgl_context_with_attribs (hdc,
hglrc_base,
share,
flags,
TRUE,
@ -546,6 +570,20 @@ create_wgl_context (GdkGLContext *context,
if (hglrc == NULL)
{
legacy = TRUE;
hglrc_base = create_base_wgl_context (display_win32,
hdc,
TRUE,
&remove_base_context);
if (hglrc_base == NULL || !wglMakeCurrent (hdc, hglrc_base))
{
g_clear_pointer (&hglrc_base, gdk_win32_private_wglDeleteContext);
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
return 0;
}
gdk_gl_context_get_matching_version (context,
GDK_GL_API_GL,
TRUE,
@ -560,7 +598,8 @@ create_wgl_context (GdkGLContext *context,
gdk_gl_context_set_is_legacy (context, legacy);
}
g_clear_pointer (&hglrc_base, gdk_win32_private_wglDeleteContext);
if (remove_base_context)
g_clear_pointer (&hglrc_base, gdk_win32_private_wglDeleteContext);
wglMakeCurrent (hdc_current, hglrc_current);
@ -591,6 +630,7 @@ set_wgl_pixformat_for_hdc (GdkWin32Display *display_win32,
* also use for our new dummy HDC will have the correct pixel format set
*/
wglDeleteContext (display_win32->dummy_context_wgl.hglrc);
display_win32->dummy_context_wgl.hglrc = NULL;
display_win32->dummy_context_wgl.hdc = GetDC (display_win32->hwnd);
*hdc = display_win32->dummy_context_wgl.hdc;
*recreate_dummy_context = TRUE;
@ -676,8 +716,8 @@ gdk_win32_gl_context_wgl_realize (GdkGLContext *context,
flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
hglrc = create_wgl_context (context,
display_win32,
hdc,
display_win32->hasWglARBCreateContext,
share,
flags,
legacy_bit,
@ -687,8 +727,8 @@ gdk_win32_gl_context_wgl_realize (GdkGLContext *context,
{
display_win32->dummy_context_wgl.hglrc =
create_wgl_context (context,
display_win32,
display_win32->dummy_context_wgl.hdc,
display_win32->hasWglARBCreateContext,
NULL,
flags,
legacy_bit,