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gtk/gdk/win32/gdkglcontext-win32-wgl.c
Chun-wei Fan 0073ee29da gdkglcontext-win32-wgl.c: Always request alpha bits 
...when we are using wglChoosePixelFormatARHB().  This ensures that we
hvae a HDC with a pixel format that will really support alpha bits, as
we did for the traditional ChoosePixelFormat().

Thanks to Patrick Zacharias for testing and pointing things out.
2023-05-09 18:15:23 +08:00

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/* GDK - The GIMP Drawing Kit
*
* gdkglcontext-win32.c: Win32 specific OpenGL wrappers
*
* Copyright © 2014 Emmanuele Bassi
* Copyright © 2014 Alexander Larsson
* Copyright © 2014 Chun-wei Fan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gdkprivate-win32.h"
#include "gdksurface-win32.h"
#include "gdkglcontext-win32.h"
#include "gdkdisplay-win32.h"
#include "gdkwin32display.h"
#include "gdkwin32glcontext.h"
#include "gdkwin32misc.h"
#include "gdkwin32screen.h"
#include "gdkwin32surface.h"
#include "gdkglcontext.h"
#include "gdkprofilerprivate.h"
#include <glib/gi18n-lib.h>
#include "gdksurface.h"
#include <cairo.h>
#include <epoxy/wgl.h>
struct _GdkWin32GLContextWGL
{
GdkWin32GLContext parent_instance;
HGLRC wgl_context;
guint do_frame_sync : 1;
};
typedef struct _GdkWin32GLContextClass GdkWin32GLContextWGLClass;
G_DEFINE_TYPE (GdkWin32GLContextWGL, gdk_win32_gl_context_wgl, GDK_TYPE_WIN32_GL_CONTEXT)
static void
gdk_win32_gl_context_wgl_dispose (GObject *gobject)
{
GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (gobject);
if (context_wgl->wgl_context != NULL)
{
if (gdk_win32_private_wglGetCurrentContext () == context_wgl->wgl_context)
gdk_win32_private_wglMakeCurrent (NULL, NULL);
GDK_NOTE (OPENGL, g_print ("Destroying WGL context\n"));
gdk_win32_private_wglDeleteContext (context_wgl->wgl_context);
context_wgl->wgl_context = NULL;
}
G_OBJECT_CLASS (gdk_win32_gl_context_wgl_parent_class)->dispose (gobject);
}
static void
gdk_win32_gl_context_wgl_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (context);
GdkSurface *surface = gdk_gl_context_get_surface (context);
GdkWin32Display *display_win32 = (GDK_WIN32_DISPLAY (gdk_gl_context_get_display (context)));
gboolean can_wait = display_win32->hasWglOMLSyncControl;
HDC hdc;
GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_wgl_parent_class)->end_frame (draw_context, painted);
gdk_gl_context_make_current (context);
gdk_profiler_add_mark (GDK_PROFILER_CURRENT_TIME, 0, "win32", "swap buffers");
if (surface != NULL)
hdc = GDK_WIN32_SURFACE (surface)->hdc;
else
hdc = display_win32->dummy_context_wgl.hdc;
if (context_wgl->do_frame_sync)
{
glFinish ();
if (can_wait)
{
gint64 ust, msc, sbc;
wglGetSyncValuesOML (hdc, &ust, &msc, &sbc);
wglWaitForMscOML (hdc,
0,
2,
(msc + 1) % 2,
&ust, &msc, &sbc);
}
}
SwapBuffers (hdc);
}
static void
gdk_win32_gl_context_wgl_begin_frame (GdkDrawContext *draw_context,
gboolean prefers_high_depth,
cairo_region_t *update_area)
{
gdk_win32_surface_handle_queued_move_resize (draw_context);
GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_wgl_parent_class)->begin_frame (draw_context, prefers_high_depth, update_area);
}
static int
gdk_init_dummy_wgl_context (GdkWin32Display *display_win32);
#define PIXEL_ATTRIBUTES 17
static int
get_wgl_pfd (HDC hdc,
PIXELFORMATDESCRIPTOR *pfd,
GdkWin32Display *display_win32)
{
int best_pf = 0;
pfd->nSize = sizeof (PIXELFORMATDESCRIPTOR);
if (display_win32 != NULL &&
display_win32->hasWglARBPixelFormat)
{
UINT num_formats;
int colorbits = GetDeviceCaps (hdc, BITSPIXEL);
int i = 0;
int pixelAttribs[PIXEL_ATTRIBUTES];
/* 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 ();
/* Update PIXEL_ATTRIBUTES above if any groups are added here! */
pixelAttribs[i++] = WGL_DRAW_TO_WINDOW_ARB;
pixelAttribs[i++] = GL_TRUE;
pixelAttribs[i++] = WGL_SUPPORT_OPENGL_ARB;
pixelAttribs[i++] = GL_TRUE;
pixelAttribs[i++] = WGL_DOUBLE_BUFFER_ARB;
pixelAttribs[i++] = GL_TRUE;
pixelAttribs[i++] = WGL_ACCELERATION_ARB;
pixelAttribs[i++] = WGL_FULL_ACCELERATION_ARB;
pixelAttribs[i++] = WGL_PIXEL_TYPE_ARB;
pixelAttribs[i++] = WGL_TYPE_RGBA_ARB;
pixelAttribs[i++] = WGL_COLOR_BITS_ARB;
pixelAttribs[i++] = colorbits;
pixelAttribs[i++] = WGL_ALPHA_BITS_ARB;
pixelAttribs[i++] = 8;
/* end of "Update PIXEL_ATTRIBUTES above if any groups are added here!" */
pixelAttribs[i++] = 0; /* end of pixelAttribs */
g_assert (i <= PIXEL_ATTRIBUTES);
best_pf = gdk_init_dummy_wgl_context (display_win32);
if (!wglMakeCurrent (display_win32->dummy_context_wgl.hdc,
display_win32->dummy_context_wgl.hglrc))
{
wglMakeCurrent (hdc_current, hglrc_current);
return 0;
}
wglChoosePixelFormatARB (hdc,
pixelAttribs,
NULL,
1,
&best_pf,
&num_formats);
/* Go back to the HDC that we were using, since we are done with the dummy HDC and GL Context */
wglMakeCurrent (hdc_current, hglrc_current);
}
else
{
pfd->nVersion = 1;
pfd->dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
pfd->iPixelType = PFD_TYPE_RGBA;
pfd->cColorBits = GetDeviceCaps (hdc, BITSPIXEL);
pfd->cAlphaBits = 8;
pfd->dwLayerMask = PFD_MAIN_PLANE;
best_pf = ChoosePixelFormat (hdc, pfd);
}
return best_pf;
}
/* in WGL, for many OpenGL items, we need a dummy WGL context, so create
* one and cache it for later use
*/
static int
gdk_init_dummy_wgl_context (GdkWin32Display *display_win32)
{
PIXELFORMATDESCRIPTOR pfd;
gboolean set_pixel_format_result = FALSE;
int best_idx = 0;
memset (&pfd, 0, sizeof (PIXELFORMATDESCRIPTOR));
best_idx = get_wgl_pfd (display_win32->dummy_context_wgl.hdc, &pfd, NULL);
if (best_idx != 0)
set_pixel_format_result = SetPixelFormat (display_win32->dummy_context_wgl.hdc,
best_idx,
&pfd);
if (best_idx == 0 || !set_pixel_format_result)
return 0;
display_win32->dummy_context_wgl.hglrc =
wglCreateContext (display_win32->dummy_context_wgl.hdc);
if (display_win32->dummy_context_wgl.hglrc == NULL)
return 0;
return best_idx;
}
/*
* Use a dummy HWND to init GL, sadly we can't just use the
* HWND that we use for notifications as we may only call
* SetPixelFormat() on an HDC once, and that notification HWND
* uses the CS_OWNDC style meaning that even if we were to call
* DeleteDC() on it, we would get the exact same HDC when we call
* GetDC() on it later, meaning SetPixelFormat() cannot be used
* again on the HDC that we acquire from the notification HWND.
*/
static HWND
create_dummy_gl_window (void)
{
WNDCLASS wclass = { 0, };
ATOM klass;
HWND hwnd;
wclass.lpszClassName = "GdkGLDummyWindow";
wclass.lpfnWndProc = DefWindowProc;
wclass.hInstance = _gdk_app_hmodule;
wclass.style = CS_OWNDC;
klass = RegisterClass (&wclass);
if (klass)
{
hwnd = CreateWindow (MAKEINTRESOURCE (klass),
NULL, WS_POPUP,
0, 0, 0, 0, NULL, NULL,
_gdk_app_hmodule, NULL);
if (!hwnd)
{
UnregisterClass (MAKEINTRESOURCE (klass), _gdk_app_hmodule);
}
}
return hwnd;
}
GdkGLContext *
gdk_win32_display_init_wgl (GdkDisplay *display,
GError **error)
{
int best_idx = 0;
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
GdkGLContext *context;
HDC hdc;
if (!gdk_gl_backend_can_be_used (GDK_GL_WGL, error))
return NULL;
/* acquire and cache dummy Window (HWND & HDC) and
* dummy GL Context, it is used to query functions
* and used for other stuff as well
*/
if (display_win32->dummy_context_wgl.hdc == NULL)
{
display_win32->dummy_context_wgl.hwnd = create_dummy_gl_window ();
if (display_win32->dummy_context_wgl.hwnd != NULL)
display_win32->dummy_context_wgl.hdc = GetDC (display_win32->dummy_context_wgl.hwnd);
}
best_idx = gdk_init_dummy_wgl_context (display_win32);
hdc = display_win32->dummy_context_wgl.hdc;
if (best_idx == 0 ||
!wglMakeCurrent (hdc, display_win32->dummy_context_wgl.hglrc))
{
if (display_win32->dummy_context_wgl.hglrc != NULL)
wglDeleteContext (display_win32->dummy_context_wgl.hglrc);
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("No GL implementation is available"));
return NULL;
}
display_win32->hasWglARBCreateContext =
epoxy_has_wgl_extension (hdc, "WGL_ARB_create_context");
display_win32->hasWglEXTSwapControl =
epoxy_has_wgl_extension (hdc, "WGL_EXT_swap_control");
display_win32->hasWglOMLSyncControl =
epoxy_has_wgl_extension (hdc, "WGL_OML_sync_control");
display_win32->hasWglARBPixelFormat =
epoxy_has_wgl_extension (hdc, "WGL_ARB_pixel_format");
context = g_object_new (GDK_TYPE_WIN32_GL_CONTEXT_WGL,
"display", display,
NULL);
if (!gdk_gl_context_realize (context, error))
{
g_object_unref (context);
return NULL;
}
#if G_ENABLE_DEBUG
{
int major, minor;
gdk_gl_context_get_version (context, &major, &minor);
GDK_NOTE (OPENGL, g_print ("WGL API version %d.%d found\n"
" - Vendor: %s\n"
" - Checked extensions:\n"
"\t* WGL_ARB_pixel_format: %s\n"
"\t* WGL_ARB_create_context: %s\n"
"\t* WGL_EXT_swap_control: %s\n"
"\t* WGL_OML_sync_control: %s\n",
major, minor,
glGetString (GL_VENDOR),
display_win32->hasWglARBPixelFormat ? "yes" : "no",
display_win32->hasWglARBCreateContext ? "yes" : "no",
display_win32->hasWglEXTSwapControl ? "yes" : "no",
display_win32->hasWglOMLSyncControl ? "yes" : "no"));
}
#endif
wglMakeCurrent (NULL, NULL);
return context;
}
/* Setup the legacy context after creating it */
static gboolean
ensure_legacy_wgl_context (HDC hdc,
HGLRC hglrc_legacy,
GdkGLContext *share,
GdkGLVersion *version,
GError **error)
{
GdkWin32GLContextWGL *context_wgl;
GdkGLVersion legacy_version;
GDK_NOTE (OPENGL,
g_print ("Creating legacy WGL context (version:%d.%d)\n",
gdk_gl_version_get_major (version),
gdk_gl_version_get_minor (version)));
if (!wglMakeCurrent (hdc, hglrc_legacy))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
return FALSE;
}
gdk_gl_version_init_epoxy (&legacy_version);
if (!gdk_gl_version_greater_equal (&legacy_version, version))
{
g_set_error (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("WGL version %d.%d is too low, need at least %d.%d"),
gdk_gl_version_get_major (&legacy_version),
gdk_gl_version_get_minor (&legacy_version),
gdk_gl_version_get_major (version),
gdk_gl_version_get_minor (version));
return FALSE;
}
*version = legacy_version;
if (share != NULL)
{
context_wgl = GDK_WIN32_GL_CONTEXT_WGL (share);
if (!wglShareLists (hglrc_legacy, context_wgl->wgl_context))
{
g_set_error (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_PROFILE,
_("GL implementation cannot share GL contexts"));
return FALSE;
}
}
return TRUE;
}
static HGLRC
create_wgl_context_with_attribs (HDC hdc,
GdkGLContext *share,
int flags,
gboolean is_legacy,
GdkGLVersion *version)
{
HGLRC hglrc;
GdkWin32GLContextWGL *context_wgl;
const GdkGLVersion *supported_versions = gdk_gl_versions_get_for_api (GDK_GL_API_GL);
guint i;
GDK_NOTE (OPENGL,
g_print ("Creating %s WGL context (version:%d.%d, debug:%s, forward:%s)\n",
is_legacy ? "core" : "compat",
gdk_gl_version_get_major (version),
gdk_gl_version_get_minor (version),
(flags & WGL_CONTEXT_DEBUG_BIT_ARB) ? "yes" : "no",
(flags & WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB) ? "yes" : "no"));
for (i = 0; gdk_gl_version_greater_equal (&supported_versions[i], version); i++)
{
/* if we have wglCreateContextAttribsARB(), create a
* context with the compatibility profile if a legacy
* context is requested, or when we go into fallback mode
*/
int profile = is_legacy ? WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB :
WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
int attribs[] = {
WGL_CONTEXT_PROFILE_MASK_ARB, profile,
WGL_CONTEXT_MAJOR_VERSION_ARB, gdk_gl_version_get_major (&supported_versions[i]),
WGL_CONTEXT_MINOR_VERSION_ARB, gdk_gl_version_get_minor (&supported_versions[i]),
WGL_CONTEXT_FLAGS_ARB, flags,
0
};
if (share != NULL)
context_wgl = GDK_WIN32_GL_CONTEXT_WGL (share);
hglrc = wglCreateContextAttribsARB (hdc,
share != NULL ? context_wgl->wgl_context : NULL,
attribs);
if (hglrc)
{
*version = supported_versions[i];
return hglrc;
}
}
return NULL;
}
static HGLRC
create_base_wgl_context (GdkWin32Display *display_win32,
HDC hdc,
gboolean force_create_base_context,
gboolean *remove_base_context)
{
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 = NULL;
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,
GDK_GL_API_GL,
FALSE,
&version);
hglrc = create_wgl_context_with_attribs (hdc,
share,
flags,
FALSE,
&version);
}
if (hglrc == NULL)
{
legacy = TRUE;
gdk_gl_context_get_matching_version (context,
GDK_GL_API_GL,
TRUE,
&version);
hglrc = create_wgl_context_with_attribs (hdc,
share,
flags,
TRUE,
&version);
}
}
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,
&version);
if (ensure_legacy_wgl_context (hdc, hglrc_base, share, &version, error))
hglrc = g_steal_pointer (&hglrc_base);
}
if (hglrc)
{
gdk_gl_context_set_version (context, &version);
gdk_gl_context_set_is_legacy (context, legacy);
}
if (remove_base_context)
g_clear_pointer (&hglrc_base, gdk_win32_private_wglDeleteContext);
wglMakeCurrent (hdc_current, hglrc_current);
return hglrc;
}
static gboolean
set_wgl_pixformat_for_hdc (GdkWin32Display *display_win32,
HDC *hdc,
int *best_idx,
gboolean *recreate_dummy_context)
{
gboolean skip_acquire = FALSE;
gboolean set_pixel_format_result = FALSE;
PIXELFORMATDESCRIPTOR pfd;
/* one is only allowed to call SetPixelFormat(), and so ChoosePixelFormat()
* one single time per window HDC
*/
GDK_NOTE (OPENGL, g_print ("requesting pixel format...\n"));
*best_idx = get_wgl_pfd (*hdc, &pfd, display_win32);
if (display_win32->dummy_context_wgl.hwnd != NULL)
{
/*
* Ditch the initial dummy HDC, HGLRC and HWND used to initialize WGL,
* we want to ensure that the HDC of the notification HWND that we will
* 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;
DestroyWindow (display_win32->dummy_context_wgl.hwnd);
display_win32->dummy_context_wgl.hwnd = NULL;
}
if (GetPixelFormat (*hdc) != 0)
{
skip_acquire = TRUE;
set_pixel_format_result = TRUE;
}
else 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", skip_acquire ? "already " : "", *best_idx));
return TRUE;
}
static GdkGLAPI
gdk_win32_gl_context_wgl_realize (GdkGLContext *context,
GError **error)
{
GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (context);
gboolean debug_bit, compat_bit, legacy_bit;
/* request flags and specific versions for core (3.2+) WGL context */
int flags = 0;
HGLRC hglrc;
int pixel_format = 0;
HDC hdc;
gboolean recreate_dummy_context = FALSE;
GdkSurface *surface = gdk_gl_context_get_surface (context);
GdkDisplay *display = gdk_gl_context_get_display (context);
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
GdkGLContext *share = gdk_display_get_gl_context (display);
if (!gdk_gl_context_is_api_allowed (context, GDK_GL_API_GL, error))
return 0;
debug_bit = gdk_gl_context_get_debug_enabled (context);
compat_bit = gdk_gl_context_get_forward_compatible (context);
/*
* A legacy context cannot be shared with core profile ones, so this means we
* must stick to a legacy context if the shared context is a legacy context
*/
legacy_bit = (gdk_display_get_debug_flags (display) & GDK_DEBUG_GL_LEGACY)
? TRUE
: share != NULL && gdk_gl_context_is_legacy (share);
if (surface != NULL)
hdc = GDK_WIN32_SURFACE (surface)->hdc;
else
hdc = display_win32->dummy_context_wgl.hdc;
if (!set_wgl_pixformat_for_hdc (display_win32,
&hdc,
&pixel_format,
&recreate_dummy_context))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given pixel format"));
return 0;
}
/* if there isn't wglCreateContextAttribsARB() on WGL, use a legacy context */
if (!legacy_bit)
legacy_bit = !display_win32->hasWglARBCreateContext;
if (debug_bit)
flags |= WGL_CONTEXT_DEBUG_BIT_ARB;
if (compat_bit)
flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
hglrc = create_wgl_context (context,
display_win32,
hdc,
share,
flags,
legacy_bit,
error);
if (recreate_dummy_context)
{
display_win32->dummy_context_wgl.hglrc =
create_wgl_context (context,
display_win32,
display_win32->dummy_context_wgl.hdc,
NULL,
flags,
legacy_bit,
error);
if (display_win32->dummy_context_wgl.hglrc == NULL)
{
if (hglrc != NULL)
{
wglDeleteContext (hglrc);
hglrc = NULL;
}
}
}
if (hglrc == NULL)
return 0;
GDK_NOTE (OPENGL,
g_print ("Created WGL context[%p], pixel_format=%d\n",
hglrc,
pixel_format));
context_wgl->wgl_context = hglrc;
return GDK_GL_API_GL;
}
static gboolean
gdk_win32_gl_context_wgl_clear_current (GdkGLContext *context)
{
return gdk_win32_private_wglMakeCurrent (NULL, NULL);
}
static gboolean
gdk_win32_gl_context_wgl_is_current (GdkGLContext *context)
{
GdkWin32GLContextWGL *self = GDK_WIN32_GL_CONTEXT_WGL (context);
return self->wgl_context == gdk_win32_private_wglGetCurrentContext ();
}
static gboolean
gdk_win32_gl_context_wgl_make_current (GdkGLContext *context,
gboolean surfaceless)
{
GdkWin32GLContextWGL *context_wgl = GDK_WIN32_GL_CONTEXT_WGL (context);
GdkDisplay *display = gdk_gl_context_get_display (context);
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
GdkSurface *surface = gdk_gl_context_get_surface (context);
HDC hdc;
if (surfaceless || surface == NULL)
hdc = display_win32->dummy_context_wgl.hdc;
else
hdc = GDK_WIN32_SURFACE (surface)->hdc;
if (!gdk_win32_private_wglMakeCurrent (hdc, context_wgl->wgl_context))
return FALSE;
if (!surfaceless && display_win32->hasWglEXTSwapControl)
{
gboolean do_frame_sync = FALSE;
/* If there is compositing there is no particular need to delay
* the swap when drawing on the offscreen, rendering to the screen
* happens later anyway, and its up to the compositor to sync that
* to the vblank. */
do_frame_sync = ! gdk_display_is_composited (display);
if (do_frame_sync != context_wgl->do_frame_sync)
{
context_wgl->do_frame_sync = do_frame_sync;
wglSwapIntervalEXT (do_frame_sync ? 1 : 0);
}
}
return TRUE;
}
static void
gdk_win32_gl_context_wgl_class_init (GdkWin32GLContextWGLClass *klass)
{
GdkGLContextClass *context_class = GDK_GL_CONTEXT_CLASS (klass);
GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
context_class->backend_type = GDK_GL_WGL;
context_class->realize = gdk_win32_gl_context_wgl_realize;
context_class->make_current = gdk_win32_gl_context_wgl_make_current;
context_class->clear_current = gdk_win32_gl_context_wgl_clear_current;
context_class->is_current = gdk_win32_gl_context_wgl_is_current;
draw_context_class->begin_frame = gdk_win32_gl_context_wgl_begin_frame;
draw_context_class->end_frame = gdk_win32_gl_context_wgl_end_frame;
gobject_class->dispose = gdk_win32_gl_context_wgl_dispose;
}
static void
gdk_win32_gl_context_wgl_init (GdkWin32GLContextWGL *wgl_context)
{
}
/**
* gdk_win32_display_get_wgl_version:
* @display: a `GdkDisplay`
* @major: (out): return location for the WGL major version
* @minor: (out): return location for the WGL minor version
*
* Retrieves the version of the WGL implementation.
*
* Returns: %TRUE if WGL is available
*/
gboolean
gdk_win32_display_get_wgl_version (GdkDisplay *display,
int *major,
int *minor)
{
GdkGLContext *context;
g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
if (!GDK_IS_WIN32_DISPLAY (display))
return FALSE;
if (!gdk_gl_backend_can_be_used (GDK_GL_WGL, NULL))
return FALSE;
context = gdk_display_get_gl_context (display);
if (context == NULL)
return FALSE;
gdk_gl_context_get_version (context, major, minor);
return TRUE;
}
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