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gtk2/gdk/win32/gdkglcontext-win32.c
Chun-wei Fan b67a1c7f39 GDK-Win32: Improve GL on Windows 
Update the GDKGL implementation:

-Allow legacy contexts to be created.
-Use finer-grained attributes to ask for a pixel format when possible,
 which also adds support for anti-aliasing

In fact the changes here are required for GTKGL to work properly on
Windows for 4.x.

Note that creation of gles contexts are not done here, as the system does
not support such contexts directly on Windows, but only through means such
as ANGLE, which is a totally different issue here.

https://bugzilla.gnome.org/show_bug.cgi?id=773528
2016-10-28 16:07:02 +08:00

904 lines
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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 "gdkwindow-win32.h"
#include "gdkglcontext-win32.h"
#include "gdkdisplay-win32.h"
#include "gdkwin32display.h"
#include "gdkwin32glcontext.h"
#include "gdkwin32misc.h"
#include "gdkwin32screen.h"
#include "gdkwin32window.h"
#include "gdkglcontext.h"
#include "gdkwindow.h"
#include "gdkinternals.h"
#include "gdkintl.h"
#include <cairo.h>
#include <epoxy/wgl.h>
G_DEFINE_TYPE (GdkWin32GLContext, gdk_win32_gl_context, GDK_TYPE_GL_CONTEXT)
static void
_gdk_win32_gl_context_dispose (GObject *gobject)
{
GdkGLContext *context = GDK_GL_CONTEXT (gobject);
GdkWin32GLContext *context_win32 = GDK_WIN32_GL_CONTEXT (gobject);
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (gdk_gl_context_get_display (context));
GdkWindow *window = gdk_gl_context_get_window (context);
if (context_win32->hglrc != NULL)
{
if (wglGetCurrentContext () == context_win32->hglrc)
wglMakeCurrent (NULL, NULL);
GDK_NOTE (OPENGL, g_print ("Destroying WGL context\n"));
wglDeleteContext (context_win32->hglrc);
context_win32->hglrc = NULL;
ReleaseDC (display_win32->gl_hwnd, context_win32->gl_hdc);
}
if (window != NULL && window->impl != NULL)
{
GdkWindowImplWin32 *impl = GDK_WINDOW_IMPL_WIN32 (window->impl);
if (impl->suppress_layered > 0)
impl->suppress_layered--;
/* If we don't have any window that forces layered windows off,
* trigger update_style_bits() to enable layered windows again
*/
if (impl->suppress_layered == 0)
_gdk_win32_window_update_style_bits (window);
}
G_OBJECT_CLASS (gdk_win32_gl_context_parent_class)->dispose (gobject);
}
static void
gdk_win32_gl_context_class_init (GdkWin32GLContextClass *klass)
{
GdkGLContextClass *context_class = GDK_GL_CONTEXT_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
context_class->end_frame = _gdk_win32_gl_context_end_frame;
context_class->realize = _gdk_win32_gl_context_realize;
gobject_class->dispose = _gdk_win32_gl_context_dispose;
}
static void
gdk_win32_gl_context_init (GdkWin32GLContext *self)
{
}
static void
gdk_gl_blit_region (GdkWindow *window, cairo_region_t *region)
{
int n_rects, i;
int scale = gdk_window_get_scale_factor (window);
int wh = gdk_window_get_height (window);
cairo_rectangle_int_t rect;
n_rects = cairo_region_num_rectangles (region);
for (i = 0; i < n_rects; i++)
{
cairo_region_get_rectangle (region, i, &rect);
glScissor (rect.x * scale, (wh - rect.y - rect.height) * scale, rect.width * scale, rect.height * scale);
glBlitFramebuffer (rect.x * scale, (wh - rect.y - rect.height) * scale, (rect.x + rect.width) * scale, (wh - rect.y) * scale,
rect.x * scale, (wh - rect.y - rect.height) * scale, (rect.x + rect.width) * scale, (wh - rect.y) * scale,
GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
}
void
_gdk_win32_gl_context_end_frame (GdkGLContext *context,
cairo_region_t *painted,
cairo_region_t *damage)
{
GdkWin32GLContext *context_win32 = GDK_WIN32_GL_CONTEXT (context);
GdkWindow *window = gdk_gl_context_get_window (context);
GdkWin32Display *display = (GDK_WIN32_DISPLAY (gdk_gl_context_get_display (context)));
gboolean can_wait = display->hasWglOMLSyncControl;
gdk_gl_context_make_current (context);
if (context_win32->do_frame_sync)
{
if (context_win32->do_frame_sync)
{
glFinish ();
if (can_wait)
{
gint64 ust, msc, sbc;
wglGetSyncValuesOML (context_win32->gl_hdc, &ust, &msc, &sbc);
wglWaitForMscOML (context_win32->gl_hdc,
0,
2,
(msc + 1) % 2,
&ust, &msc, &sbc);
}
}
}
if (context_win32->do_blit_swap)
{
glDrawBuffer(GL_FRONT);
glReadBuffer(GL_BACK);
gdk_gl_blit_region (window, painted);
glDrawBuffer(GL_BACK);
glFlush();
if (gdk_gl_context_has_frame_terminator (context))
glFrameTerminatorGREMEDY ();
}
else
SwapBuffers (context_win32->gl_hdc);
}
void
_gdk_win32_window_invalidate_for_new_frame (GdkWindow *window,
cairo_region_t *update_area)
{
cairo_rectangle_int_t window_rect;
gboolean invalidate_all = FALSE;
GdkWin32GLContext *context_win32;
cairo_rectangle_int_t whole_window = { 0, 0, gdk_window_get_width (window), gdk_window_get_height (window) };
/* Minimal update is ok if we're not drawing with gl */
if (window->gl_paint_context == NULL)
return;
context_win32 = GDK_WIN32_GL_CONTEXT (window->gl_paint_context);
context_win32->do_blit_swap = FALSE;
if (gdk_gl_context_has_framebuffer_blit (window->gl_paint_context) &&
cairo_region_contains_rectangle (update_area, &whole_window) != CAIRO_REGION_OVERLAP_IN)
{
context_win32->do_blit_swap = TRUE;
}
else
invalidate_all = TRUE;
if (invalidate_all)
{
window_rect.x = 0;
window_rect.y = 0;
window_rect.width = gdk_window_get_width (window);
window_rect.height = gdk_window_get_height (window);
/* If nothing else is known, repaint everything so that the back
buffer is fully up-to-date for the swapbuffer */
cairo_region_union_rectangle (update_area, &window_rect);
}
}
typedef struct
{
ATOM wc_atom;
HWND hwnd;
HDC hdc;
HGLRC hglrc;
gboolean inited;
} GdkWGLDummy;
static void
_destroy_dummy_gl_context (GdkWGLDummy dummy)
{
if (dummy.hglrc != NULL)
{
if (wglGetCurrentContext () == dummy.hglrc)
wglMakeCurrent (NULL, NULL);
wglDeleteContext (dummy.hglrc);
dummy.hglrc = NULL;
}
if (dummy.hdc != NULL)
{
DeleteDC (dummy.hdc);
dummy.hdc = NULL;
}
if (dummy.hwnd != NULL)
{
DestroyWindow (dummy.hwnd);
dummy.hwnd = NULL;
}
if (dummy.wc_atom != 0)
{
UnregisterClass (MAKEINTATOM (dummy.wc_atom), GetModuleHandle (NULL));
dummy.wc_atom = 0;
}
dummy.inited = FALSE;
}
/* Yup, we need to create a dummy window for the dummy WGL context */
static void
_get_dummy_window_hwnd (GdkWGLDummy *dummy)
{
WNDCLASSEX dummy_wc;
memset (&dummy_wc, 0, sizeof (WNDCLASSEX));
dummy_wc.cbSize = sizeof( WNDCLASSEX );
dummy_wc.style = CS_OWNDC;
dummy_wc.lpfnWndProc = (WNDPROC) DefWindowProc;
dummy_wc.cbClsExtra = 0;
dummy_wc.cbWndExtra = 0;
dummy_wc.hInstance = GetModuleHandle( NULL );
dummy_wc.hIcon = 0;
dummy_wc.hCursor = NULL;
dummy_wc.hbrBackground = 0;
dummy_wc.lpszMenuName = 0;
dummy_wc.lpszClassName = "dummy";
dummy_wc.hIconSm = 0;
dummy->wc_atom = RegisterClassEx (&dummy_wc);
dummy->hwnd =
CreateWindowEx (WS_EX_APPWINDOW,
MAKEINTATOM (dummy->wc_atom),
"",
WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
0,
0,
0,
0,
NULL,
NULL,
GetModuleHandle (NULL),
NULL);
}
static gint
_gdk_init_dummy_context (GdkWGLDummy *dummy,
const gboolean need_alpha_bits);
#define PIXEL_ATTRIBUTES 19
static gint
_get_wgl_pfd (HDC hdc,
const gboolean need_alpha_bits,
PIXELFORMATDESCRIPTOR *pfd,
GdkWin32Display *display)
{
gint best_pf = 0;
pfd->nSize = sizeof (PIXELFORMATDESCRIPTOR);
if (display != NULL && display->hasWglARBPixelFormat)
{
GdkWGLDummy dummy;
UINT num_formats;
gint colorbits = GetDeviceCaps (hdc, BITSPIXEL);
guint extra_fields = 1;
gint i = 0;
int pixelAttribs[PIXEL_ATTRIBUTES];
int alpha_idx = 0;
if (display->hasWglARBmultisample)
{
/* 2 pairs of values needed for multisampling/AA support */
extra_fields += 2 * 2;
}
/* Update PIXEL_ATTRIBUTES above if any groups are added here! */
/* one group contains a value pair for both pixelAttribs and pixelAttribsNoAlpha */
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;
/* end of "Update PIXEL_ATTRIBUTES above if any groups are added here!" */
if (display->hasWglARBmultisample)
{
pixelAttribs[i++] = WGL_SAMPLE_BUFFERS_ARB;
pixelAttribs[i++] = 1;
pixelAttribs[i++] = WGL_SAMPLES_ARB;
pixelAttribs[i++] = 8;
}
pixelAttribs[i++] = WGL_ALPHA_BITS_ARB;
/* track the spot where the alpha bits are, so that we can clear it if needed */
alpha_idx = i;
pixelAttribs[i++] = 8;
pixelAttribs[i++] = 0; /* end of pixelAttribs */
memset (&dummy, 0, sizeof (GdkWGLDummy));
/* acquire and cache dummy Window (HWND & HDC) and
* dummy GL Context, we need it for wglChoosePixelFormatARB()
*/
best_pf = _gdk_init_dummy_context (&dummy, need_alpha_bits);
if (best_pf == 0 || !wglMakeCurrent (dummy.hdc, dummy.hglrc))
return 0;
wglChoosePixelFormatARB (hdc,
pixelAttribs,
NULL,
1,
&best_pf,
&num_formats);
if (best_pf == 0)
{
if (!need_alpha_bits)
{
pixelAttribs[alpha_idx] = 0;
pixelAttribs[alpha_idx + 1] = 0;
/* give another chance if need_alpha_bits is FALSE,
* meaning we prefer to have an alpha channel anyways
*/
wglChoosePixelFormatARB (hdc,
pixelAttribs,
NULL,
1,
&best_pf,
&num_formats);
}
}
wglMakeCurrent (NULL, NULL);
_destroy_dummy_gl_context (dummy);
}
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);
if (best_pf == 0)
/* give another chance if need_alpha_bits is FALSE,
* meaning we prefer to have an alpha channel anyways
*/
if (!need_alpha_bits)
{
pfd->cAlphaBits = 0;
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 gint
_gdk_init_dummy_context (GdkWGLDummy *dummy,
const gboolean need_alpha_bits)
{
PIXELFORMATDESCRIPTOR pfd;
gboolean set_pixel_format_result = FALSE;
gint best_idx = 0;
_get_dummy_window_hwnd (dummy);
dummy->hdc = GetDC (dummy->hwnd);
memset (&pfd, 0, sizeof (PIXELFORMATDESCRIPTOR));
best_idx = _get_wgl_pfd (dummy->hdc, need_alpha_bits, &pfd, NULL);
if (best_idx != 0)
set_pixel_format_result = SetPixelFormat (dummy->hdc,
best_idx,
&pfd);
if (best_idx == 0 || !set_pixel_format_result)
return 0;
dummy->hglrc = wglCreateContext (dummy->hdc);
if (dummy->hglrc == NULL)
return 0;
dummy->inited = TRUE;
return best_idx;
}
gboolean
_gdk_win32_display_init_gl (GdkDisplay *display,
const gboolean need_alpha_bits)
{
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
gint best_idx = 0;
GdkWGLDummy dummy;
if (display_win32->have_wgl)
return TRUE;
memset (&dummy, 0, sizeof (GdkWGLDummy));
/* acquire and cache dummy Window (HWND & HDC) and
* dummy GL Context, it is used to query functions
* and used for other stuff as well
*/
best_idx = _gdk_init_dummy_context (&dummy, need_alpha_bits);
if (best_idx == 0 || !wglMakeCurrent (dummy.hdc, dummy.hglrc))
return FALSE;
display_win32->have_wgl = TRUE;
display_win32->gl_version = epoxy_gl_version ();
display_win32->hasWglARBCreateContext =
epoxy_has_wgl_extension (dummy.hdc, "WGL_ARB_create_context");
display_win32->hasWglEXTSwapControl =
epoxy_has_wgl_extension (dummy.hdc, "WGL_EXT_swap_control");
display_win32->hasWglOMLSyncControl =
epoxy_has_wgl_extension (dummy.hdc, "WGL_OML_sync_control");
display_win32->hasWglARBPixelFormat =
epoxy_has_wgl_extension (dummy.hdc, "WGL_ARB_pixel_format");
display_win32->hasWglARBmultisample =
epoxy_has_wgl_extension (dummy.hdc, "WGL_ARB_multisample");
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",
"\t* WGL_ARB_multisample: %s\n",
display_win32->gl_version / 10,
display_win32->gl_version % 10,
glGetString (GL_VENDOR),
display_win32->hasWglARBPixelFormat ? "yes" : "no",
display_win32->hasWglARBCreateContext ? "yes" : "no",
display_win32->hasWglEXTSwapControl ? "yes" : "no",
display_win32->hasWglOMLSyncControl ? "yes" : "no",
display_win32->hasWglARBmultisample ? "yes" : "no"));
wglMakeCurrent (NULL, NULL);
_destroy_dummy_gl_context (dummy);
return TRUE;
}
/* Setup the legacy context after creating it */
static gboolean
_ensure_legacy_gl_context (HDC hdc,
HGLRC hglrc_legacy,
GdkGLContext *share)
{
GdkWin32GLContext *context_win32;
if (!wglMakeCurrent (hdc, hglrc_legacy))
return FALSE;
if (share != NULL)
{
context_win32 = GDK_WIN32_GL_CONTEXT (share);
return wglShareLists (hglrc_legacy, context_win32->hglrc);
}
return TRUE;
}
static HGLRC
_create_gl_context_with_attribs (HDC hdc,
HGLRC hglrc_base,
GdkGLContext *share,
int flags,
int major,
int minor,
gboolean *is_legacy)
{
HGLRC hglrc;
GdkWin32GLContext *context_win32;
/* 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, *is_legacy ? 3 : major,
WGL_CONTEXT_MINOR_VERSION_ARB, *is_legacy ? 0 : minor,
WGL_CONTEXT_FLAGS_ARB, flags,
0
};
if (share != NULL)
context_win32 = GDK_WIN32_GL_CONTEXT (share);
hglrc = wglCreateContextAttribsARB (hdc,
share != NULL ? context_win32->hglrc : NULL,
attribs);
return hglrc;
}
static HGLRC
_create_gl_context (HDC hdc,
GdkGLContext *share,
int flags,
int major,
int minor,
gboolean *is_legacy,
gboolean hasWglARBCreateContext)
{
/* We need a legacy context for *all* cases */
HGLRC hglrc_base = wglCreateContext (hdc);
gboolean success = TRUE;
/* if we have no wglCreateContextAttribsARB(), return the legacy context when all is set */
if (*is_legacy && !hasWglARBCreateContext)
{
if (_ensure_legacy_gl_context (hdc, hglrc_base, share))
return hglrc_base;
success = FALSE;
goto gl_fail;
}
else
{
HGLRC hglrc;
if (!wglMakeCurrent (hdc, hglrc_base))
{
success = FALSE;
goto gl_fail;
}
hglrc = _create_gl_context_with_attribs (hdc,
hglrc_base,
share,
flags,
major,
minor,
is_legacy);
/* return the legacy context we have if it could be setup properly, in case the 3.0+ context creation failed */
if (hglrc == NULL)
{
if (!(*is_legacy))
{
/* If we aren't using a legacy context in the beginning, try again with a compatibility profile 3.0 context */
hglrc = _create_gl_context_with_attribs (hdc,
hglrc_base,
share,
flags,
0, 0,
is_legacy);
*is_legacy = TRUE;
}
if (hglrc == NULL)
{
if (!_ensure_legacy_gl_context (hdc, hglrc_base, share))
success = FALSE;
}
if (success)
GDK_NOTE (OPENGL, g_print ("Using legacy context as fallback\n"));
}
gl_fail:
if (!success || hglrc != NULL)
{
wglMakeCurrent (NULL, NULL);
wglDeleteContext (hglrc_base);
}
if (!success)
return NULL;
if (hglrc != NULL)
return hglrc;
return hglrc_base;
}
}
static gboolean
_set_pixformat_for_hdc (HDC hdc,
gint *best_idx,
const gboolean need_alpha_bits,
GdkWin32Display *display)
{
PIXELFORMATDESCRIPTOR pfd;
gboolean set_pixel_format_result = FALSE;
/* one is only allowed to call SetPixelFormat(), and so ChoosePixelFormat()
* one single time per window HDC
*/
*best_idx = _get_wgl_pfd (hdc, need_alpha_bits, &pfd, display);
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;
return TRUE;
}
gboolean
_gdk_win32_gl_context_realize (GdkGLContext *context,
GError **error)
{
GdkGLContext *share = gdk_gl_context_get_shared_context (context);
GdkWin32GLContext *context_win32 = GDK_WIN32_GL_CONTEXT (context);
/* These are the real WGL context items that we will want to use later */
HGLRC hglrc;
gint pixel_format;
gboolean debug_bit, compat_bit, legacy_bit;
/* request flags and specific versions for core (3.2+) WGL context */
gint flags = 0;
gint glver_major = 0;
gint glver_minor = 0;
GdkWindow *window = gdk_gl_context_get_window (context);
GdkWindowImplWin32 *impl = GDK_WINDOW_IMPL_WIN32 (window->impl);
GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (gdk_window_get_display (window));
if (!_set_pixformat_for_hdc (context_win32->gl_hdc,
&pixel_format,
context_win32->need_alpha_bits,
win32_display))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given pixel format"));
return FALSE;
}
gdk_gl_context_get_required_version (context, &glver_major, &glver_minor);
debug_bit = gdk_gl_context_get_debug_enabled (context);
compat_bit = gdk_gl_context_get_forward_compatible (context);
/* if there isn't wglCreateContextAttribsARB(), or if GDK_GL_LEGACY is set, we default to a legacy context */
legacy_bit = !win32_display->hasWglARBCreateContext ||
g_getenv ("GDK_GL_LEGACY") != NULL;
/*
* 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
*/
if (share != NULL && gdk_gl_context_is_legacy (share))
legacy_bit = TRUE;
if (debug_bit)
flags |= WGL_CONTEXT_DEBUG_BIT_ARB;
if (compat_bit)
flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
GDK_NOTE (OPENGL,
g_print ("Creating %s WGL context (version:%d.%d, debug:%s, forward:%s, legacy: %s)\n",
compat_bit ? "core" : "compat",
glver_major,
glver_minor,
debug_bit ? "yes" : "no",
compat_bit ? "yes" : "no",
legacy_bit ? "yes" : "no"));
hglrc = _create_gl_context (context_win32->gl_hdc,
share,
flags,
glver_major,
glver_minor,
&legacy_bit,
win32_display->hasWglARBCreateContext);
if (hglrc == NULL)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
return FALSE;
}
GDK_NOTE (OPENGL,
g_print ("Created WGL context[%p], pixel_format=%d\n",
hglrc,
pixel_format));
context_win32->hglrc = hglrc;
/* OpenGL does not work with WS_EX_LAYERED enabled, so we need to
* disable WS_EX_LAYERED when we acquire a valid HGLRC
*/
impl->suppress_layered++;
/* if this is the first time a GL context is acquired for the window,
* disable layered windows by triggering update_style_bits()
*/
if (impl->suppress_layered == 1)
_gdk_win32_window_update_style_bits (window);
/* Ensure that any other context is created with a legacy bit set */
gdk_gl_context_set_is_legacy (context, legacy_bit);
return TRUE;
}
GdkGLContext *
_gdk_win32_window_create_gl_context (GdkWindow *window,
gboolean attached,
GdkGLContext *share,
GError **error)
{
GdkDisplay *display = gdk_window_get_display (window);
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (gdk_window_get_display (window));
GdkWin32GLContext *context = NULL;
GdkVisual *visual = gdk_window_get_visual (window);
gboolean need_alpha_bits = (visual == gdk_screen_get_rgba_visual (gdk_display_get_default_screen (display)));
/* Acquire and store up the Windows-specific HWND and HDC */
HWND hwnd;
HDC hdc;
if (!_gdk_win32_display_init_gl (display, need_alpha_bits))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("No GL implementation is available"));
return NULL;
}
hwnd = GDK_WINDOW_HWND (window);
hdc = GetDC (hwnd);
display_win32->gl_hdc = hdc;
display_win32->gl_hwnd = hwnd;
context = g_object_new (GDK_TYPE_WIN32_GL_CONTEXT,
"display", display,
"window", window,
"shared-context", share,
NULL);
context->need_alpha_bits = need_alpha_bits;
context->gl_hdc = hdc;
context->is_attached = attached;
return GDK_GL_CONTEXT (context);
}
gboolean
_gdk_win32_display_make_gl_context_current (GdkDisplay *display,
GdkGLContext *context)
{
GdkWin32GLContext *context_win32;
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
GdkWindow *window;
GdkScreen *screen;
gboolean do_frame_sync = FALSE;
if (context == NULL)
{
wglMakeCurrent(NULL, NULL);
return TRUE;
}
context_win32 = GDK_WIN32_GL_CONTEXT (context);
if (!wglMakeCurrent (display_win32->gl_hdc, context_win32->hglrc))
{
GDK_NOTE (OPENGL,
g_print ("Making WGL context current failed\n"));
return FALSE;
}
context_win32->gl_hdc = display_win32->gl_hdc;
if (context_win32->is_attached && display_win32->hasWglEXTSwapControl)
{
window = gdk_gl_context_get_window (context);
/* 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. */
screen = gdk_window_get_screen (window);
do_frame_sync = ! gdk_screen_is_composited (screen);
if (do_frame_sync != context_win32->do_frame_sync)
{
context_win32->do_frame_sync = do_frame_sync;
if (do_frame_sync)
wglSwapIntervalEXT (1);
else
wglSwapIntervalEXT (0);
}
}
return TRUE;
}
/**
* 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
*
* Since: 3.16
*/
gboolean
gdk_win32_display_get_wgl_version (GdkDisplay *display,
gint *major,
gint *minor)
{
g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
if (!GDK_IS_WIN32_DISPLAY (display))
return FALSE;
if (!_gdk_win32_display_init_gl (display, FALSE))
return FALSE;
if (major != NULL)
*major = GDK_WIN32_DISPLAY (display)->gl_version / 10;
if (minor != NULL)
*minor = GDK_WIN32_DISPLAY (display)->gl_version % 10;
return TRUE;
}
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