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gtk2/gdk/win32/gdkglcontext-win32.c
Chun-wei Fan a481733b40 GDK/Win32: Force GLES if running on ARM64 
If GLES support is enabled on Windows, force GLES mode if we are running
on a ARM64 version of Windows (i.e. Windows 10 for ARM).

This is required as ARM64 versions of Windows only provide a software
implementation of OpenGL 1.1/1.2, which is not enough for our purposes.
Thus, we could make instead use the GLES support provided via Google's
libANGLE (which emulates OpenGL/ES 3 with Direct3D 9/11), so that we
can run GtkGLArea programs under OpenGL/ES in ARM64 versions of Windows.

Note that eventually we could update the libepoxy build files for Windows
to not check nor enable WGL when building for ARM64 Windows, as the WGL
items do not work, although they do build.
2020-07-30 14:30:13 +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 "gdksurface.h"
#include "gdkinternals.h"
#include "gdkintl.h"
#include <cairo.h>
#include <epoxy/wgl.h>
#ifdef GDK_WIN32_ENABLE_EGL
# include <epoxy/egl.h>
#endif
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));
GdkSurface *surface = gdk_gl_context_get_surface (context);
if (display_win32 != NULL)
{
if (display_win32->have_wgl)
{
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);
}
#ifdef GDK_WIN32_ENABLE_EGL
else if (display_win32->have_egl)
{
if (eglGetCurrentContext () == context_win32->egl_context)
eglMakeCurrent(display_win32->egl_disp, EGL_NO_SURFACE, EGL_NO_SURFACE,
EGL_NO_CONTEXT);
GDK_NOTE (OPENGL, g_message ("Destroying EGL (ANGLE) context"));
eglDestroyContext (display_win32->egl_disp,
context_win32->egl_context);
context_win32->egl_context = EGL_NO_CONTEXT;
ReleaseDC (display_win32->gl_hwnd, context_win32->gl_hdc);
}
#endif
}
if (surface != NULL)
{
GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
if (impl->suppress_layered > 0)
impl->suppress_layered--;
/* If we don't have any surface that forces layered windows off,
* trigger update_style_bits() to enable layered windows again
*/
if (impl->suppress_layered == 0)
_gdk_win32_surface_update_style_bits (surface);
}
G_OBJECT_CLASS (gdk_win32_gl_context_parent_class)->dispose (gobject);
}
static void
gdk_gl_blit_region (GdkSurface *surface, cairo_region_t *region)
{
int n_rects, i;
int scale = gdk_surface_get_scale_factor (surface);
int wh = gdk_surface_get_height (surface);
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);
}
}
#ifdef GDK_WIN32_ENABLE_EGL
static gboolean
_get_is_egl_force_redraw (GdkSurface *surface)
{
/* We only need to call gdk_window_invalidate_rect () if necessary */
if (surface->gl_paint_context != NULL && gdk_gl_context_get_use_es (surface->gl_paint_context))
{
GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
return impl->egl_force_redraw_all;
}
return FALSE;
}
static void
_reset_egl_force_redraw (GdkSurface *surface)
{
if (surface->gl_paint_context != NULL && gdk_gl_context_get_use_es (surface->gl_paint_context))
{
GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
if (impl->egl_force_redraw_all)
impl->egl_force_redraw_all = FALSE;
}
}
#endif
static void
gdk_win32_gl_context_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkWin32GLContext *context_win32 = GDK_WIN32_GL_CONTEXT (context);
GdkSurface *surface = gdk_gl_context_get_surface (context);
GdkWin32Display *display = (GDK_WIN32_DISPLAY (gdk_gl_context_get_display (context)));
cairo_rectangle_int_t whole_window;
GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_parent_class)->end_frame (draw_context, painted);
if (gdk_gl_context_get_shared_context (context))
return;
gdk_gl_context_make_current (context);
whole_window = (GdkRectangle) { 0, 0, gdk_surface_get_width (surface), gdk_surface_get_height (surface) };
if (!gdk_gl_context_get_use_es (context))
{
gboolean can_wait = display->hasWglOMLSyncControl;
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 (cairo_region_contains_rectangle (painted, &whole_window) == CAIRO_REGION_OVERLAP_IN)
SwapBuffers (context_win32->gl_hdc);
else if (gdk_gl_context_has_framebuffer_blit (context))
{
glDrawBuffer(GL_FRONT);
glReadBuffer(GL_BACK);
gdk_gl_blit_region (surface, painted);
glDrawBuffer(GL_BACK);
glFlush();
if (gdk_gl_context_has_frame_terminator (context))
glFrameTerminatorGREMEDY ();
}
else
{
g_warning ("Need to swap whole buffer even thouigh not everything was redrawn. Expect artifacts.");
SwapBuffers (context_win32->gl_hdc);
}
}
#ifdef GDK_WIN32_ENABLE_EGL
else
{
EGLSurface egl_surface = _gdk_win32_surface_get_egl_surface (surface, context_win32->egl_config, FALSE);
gboolean force_egl_redraw_all = _get_is_egl_force_redraw (surface);
if (force_egl_redraw_all)
{
GdkRectangle rect = {0, 0, gdk_surface_get_width (surface), gdk_surface_get_height (surface)};
/* We need to do gdk_window_invalidate_rect() so that we don't get glitches after maximizing or
* restoring or using aerosnap
*/
gdk_surface_invalidate_rect (surface, &rect);
_reset_egl_force_redraw (surface);
}
if (cairo_region_contains_rectangle (painted, &whole_window) == CAIRO_REGION_OVERLAP_IN || force_egl_redraw_all)
eglSwapBuffers (display->egl_disp, egl_surface);
else if (gdk_gl_context_has_framebuffer_blit (context))
gdk_gl_blit_region (surface, painted);
else
{
g_warning ("Need to swap whole buffer even thouigh not everything was redrawn. Expect artifacts.");
eglSwapBuffers (display->egl_disp, egl_surface);
}
}
#endif
}
static void
gdk_win32_gl_context_begin_frame (GdkDrawContext *draw_context,
cairo_region_t *update_area)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkSurface *surface;
GdkWin32Surface *impl;
RECT queued_window_rect;
surface = gdk_gl_context_get_surface (context);
impl = GDK_WIN32_SURFACE (surface);
gdk_win32_surface_get_queued_window_rect (surface,
gdk_surface_get_scale_factor (surface),
&queued_window_rect);
/* Apply queued resizes GL windows before painting them
* (we paint on the window DC directly, it must have the right size).
* Due to some poorly-understood issue delayed
* resizing of double-buffered windows can produce weird
* artefacts, so these are also resized before we paint.
*/
if (impl->drag_move_resize_context.native_move_resize_pending)
{
impl->drag_move_resize_context.native_move_resize_pending = FALSE;
gdk_win32_surface_apply_queued_move_resize (surface, queued_window_rect);
}
GDK_DRAW_CONTEXT_CLASS (gdk_win32_gl_context_parent_class)->begin_frame (draw_context, update_area);
if (gdk_gl_context_get_shared_context (context))
return;
if (gdk_gl_context_has_framebuffer_blit (context))
return;
/* 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, &(GdkRectangle) {
0, 0,
gdk_surface_get_width (surface),
gdk_surface_get_height (surface) });
}
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)
{
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 int
_gdk_init_dummy_context (GdkWGLDummy *dummy);
#define PIXEL_ATTRIBUTES 17
static int
_get_wgl_pfd (HDC hdc,
PIXELFORMATDESCRIPTOR *pfd,
GdkWin32Display *display)
{
int best_pf = 0;
pfd->nSize = sizeof (PIXELFORMATDESCRIPTOR);
if (display != NULL && display->hasWglARBPixelFormat)
{
GdkWGLDummy dummy;
UINT num_formats;
int colorbits = GetDeviceCaps (hdc, BITSPIXEL);
guint extra_fields = 1;
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 ();
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++] = 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);
if (best_pf == 0 || !wglMakeCurrent (dummy.hdc, dummy.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);
_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);
}
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_context (GdkWGLDummy *dummy)
{
PIXELFORMATDESCRIPTOR pfd;
gboolean set_pixel_format_result = FALSE;
int 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, &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;
}
#ifdef GDK_WIN32_ENABLE_EGL
#ifndef EGL_PLATFORM_ANGLE_ANGLE
#define EGL_PLATFORM_ANGLE_ANGLE 0x3202
#endif
#ifndef EGL_PLATFORM_ANGLE_TYPE_ANGLE
#define EGL_PLATFORM_ANGLE_TYPE_ANGLE 0x3203
#endif
#ifndef EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE
#define EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE 0x3208
#endif
static EGLDisplay
_gdk_win32_get_egl_display (GdkWin32Display *display)
{
EGLDisplay disp;
gboolean success = FALSE;
if (epoxy_has_egl_extension (NULL, "EGL_EXT_platform_base"))
{
PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplay = (void *) eglGetProcAddress ("eglGetPlatformDisplayEXT");
if (getPlatformDisplay)
{
EGLint disp_attr[] = {EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_D3D11_ANGLE, EGL_NONE};
disp = getPlatformDisplay (EGL_PLATFORM_ANGLE_ANGLE, display->hdc_egl_temp, disp_attr);
if (disp != EGL_NO_DISPLAY)
return disp;
}
}
return eglGetDisplay (display->hdc_egl_temp);
}
#endif
static gboolean
_gdk_win32_display_init_gl (GdkDisplay *display)
{
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
int best_idx = 0;
gboolean disable_wgl = FALSE;
#ifdef GDK_WIN32_ENABLE_EGL
EGLDisplay egl_disp;
disable_wgl = GDK_DISPLAY_DEBUG_CHECK (display, GL_GLES) ||
display_win32->running_on_arm64;
#endif
if (display_win32->have_wgl
#ifdef GDK_WIN32_ENABLE_EGL
|| display_win32->have_egl
#endif
)
return TRUE;
if (!disable_wgl)
{
GdkWGLDummy dummy;
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);
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);
}
#ifdef GDK_WIN32_ENABLE_EGL
else
{
egl_disp = _gdk_win32_get_egl_display (display_win32);
if (egl_disp == EGL_NO_DISPLAY || !eglInitialize (egl_disp, NULL, NULL))
{
if (egl_disp != EGL_NO_DISPLAY)
{
eglTerminate (egl_disp);
egl_disp = EGL_NO_DISPLAY;
}
return FALSE;
}
display_win32->egl_disp = egl_disp;
display_win32->have_egl = TRUE;
display_win32->egl_version = epoxy_egl_version (egl_disp);
eglBindAPI(EGL_OPENGL_ES_API);
display_win32->hasEglSurfacelessContext =
epoxy_has_egl_extension (egl_disp, "EGL_KHR_surfaceless_context");
GDK_NOTE (OPENGL,
g_print ("EGL API version %d.%d found\n"
" - Vendor: %s\n"
" - Checked extensions:\n"
"\t* EGL_KHR_surfaceless_context: %s\n",
display_win32->egl_version / 10,
display_win32->egl_version % 10,
eglQueryString (display_win32->egl_disp, EGL_VENDOR),
display_win32->hasEglSurfacelessContext ? "yes" : "no"));
}
#endif
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;
/* 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 ();
/* 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))
{
wglMakeCurrent (hdc_current, hglrc_current);
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)
{
wglMakeCurrent (NULL, NULL);
wglDeleteContext (hglrc_base);
return NULL;
}
wglMakeCurrent (hdc_current, hglrc_current);
if (hglrc != NULL)
{
wglDeleteContext (hglrc_base);
return hglrc;
}
return hglrc_base;
}
}
static gboolean
_set_pixformat_for_hdc (HDC hdc,
int *best_idx,
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, &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;
}
#ifdef GDK_WIN32_ENABLE_EGL
#define MAX_EGL_ATTRS 30
static gboolean
find_eglconfig_for_window (GdkWin32Display *display,
EGLConfig *egl_config_out,
EGLint *min_swap_interval_out,
GError **error)
{
EGLint attrs[MAX_EGL_ATTRS];
EGLint count;
EGLConfig *configs, chosen_config;
int i = 0;
EGLDisplay egl_disp = display->egl_disp;
attrs[i++] = EGL_CONFORMANT;
attrs[i++] = EGL_OPENGL_ES2_BIT;
attrs[i++] = EGL_SURFACE_TYPE;
attrs[i++] = EGL_WINDOW_BIT;
attrs[i++] = EGL_COLOR_BUFFER_TYPE;
attrs[i++] = EGL_RGB_BUFFER;
attrs[i++] = EGL_RED_SIZE;
attrs[i++] = 1;
attrs[i++] = EGL_GREEN_SIZE;
attrs[i++] = 1;
attrs[i++] = EGL_BLUE_SIZE;
attrs[i++] = 1;
attrs[i++] = EGL_ALPHA_SIZE;
attrs[i++] = 1;
attrs[i++] = EGL_NONE;
g_assert (i < MAX_EGL_ATTRS);
if (!eglChooseConfig (display->egl_disp, attrs, NULL, 0, &count) || count < 1)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given pixel format"));
return FALSE;
}
configs = g_new (EGLConfig, count);
if (!eglChooseConfig (display->egl_disp, attrs, configs, count, &count) || count < 1)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given pixel format"));
return FALSE;
}
/* Pick first valid configuration i guess? */
chosen_config = configs[0];
if (!eglGetConfigAttrib (display->egl_disp, chosen_config,
EGL_MIN_SWAP_INTERVAL, min_swap_interval_out))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
"Could not retrieve the minimum swap interval");
g_free (configs);
return FALSE;
}
if (egl_config_out != NULL)
*egl_config_out = chosen_config;
g_free (configs);
return TRUE;
}
#define N_EGL_ATTRS 16
static EGLContext
_create_egl_context (EGLDisplay display,
EGLConfig config,
GdkGLContext *share,
int flags,
int major,
int minor,
gboolean *is_legacy)
{
EGLContext ctx;
EGLint context_attribs[N_EGL_ATTRS];
int i = 0;
/* ANGLE does not support the GL_OES_vertex_array_object extension, so we need to use ES3 directly */
context_attribs[i++] = EGL_CONTEXT_CLIENT_VERSION;
context_attribs[i++] = 3;
/* Specify the flags */
context_attribs[i++] = EGL_CONTEXT_FLAGS_KHR;
context_attribs[i++] = flags;
context_attribs[i++] = EGL_NONE;
g_assert (i < N_EGL_ATTRS);
ctx = eglCreateContext (display,
config,
share != NULL ? GDK_WIN32_GL_CONTEXT (share)->egl_context
: EGL_NO_CONTEXT,
context_attribs);
if (ctx != EGL_NO_CONTEXT)
GDK_NOTE (OPENGL, g_message ("Created EGL context[%p]", ctx));
return ctx;
}
#endif /* GDK_WIN32_ENABLE_EGL */
static 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);
gboolean debug_bit, compat_bit, legacy_bit;
gboolean use_es = FALSE;
/* request flags and specific versions for core (3.2+) WGL context */
int flags = 0;
int major = 0;
int minor = 0;
GdkSurface *surface = gdk_gl_context_get_surface (context);
GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
GdkDisplay *display = gdk_surface_get_display (surface);
GdkWin32Display *win32_display = GDK_WIN32_DISPLAY (display);
gdk_gl_context_get_required_version (context, &major, &minor);
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
*/
if (share != NULL && gdk_gl_context_is_legacy (share))
legacy_bit = TRUE;
/* if GDK_GL_LEGACY is set, we default to a legacy context */
legacy_bit = g_getenv ("GDK_GL_LEGACY") != NULL;
use_es = GDK_DISPLAY_DEBUG_CHECK (display, GL_GLES) ||
(share != NULL && gdk_gl_context_get_use_es (share));
if (win32_display->have_wgl || !use_es)
{
/* These are the real WGL context items that we will want to use later */
HGLRC hglrc;
int pixel_format;
if (!_set_pixformat_for_hdc (context_win32->gl_hdc,
&pixel_format,
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;
}
/* if there isn't wglCreateContextAttribsARB() on WGL, use a legacy context */
if (!legacy_bit)
legacy_bit = !win32_display->hasWglARBCreateContext;
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",
major,
minor,
debug_bit ? "yes" : "no",
compat_bit ? "yes" : "no",
legacy_bit ? "yes" : "no"));
hglrc = _create_gl_context (context_win32->gl_hdc,
share,
flags,
major,
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;
}
#ifdef GDK_WIN32_ENABLE_EGL
else
{
EGLContext egl_context;
EGLContext ctx;
if (debug_bit)
flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
if (compat_bit)
flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
GDK_NOTE (OPENGL, g_message ("Creating EGL context version %d.%d (debug:%s, forward:%s, legacy:%s)",
major, minor,
debug_bit ? "yes" : "no",
compat_bit ? "yes" : "no",
legacy_bit ? "yes" : "no"));
ctx = _create_egl_context (win32_display->egl_disp,
context_win32->egl_config,
share,
flags,
major,
minor,
&legacy_bit);
if (ctx == EGL_NO_CONTEXT)
{
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 EGL context[%p]\n",
ctx));
context_win32->egl_context = ctx;
use_es = TRUE;
}
#endif
/* set whether we are using GLES */
gdk_gl_context_set_use_es (context, use_es);
/* 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 surface,
* disable layered windows by triggering update_style_bits()
*/
if (impl->suppress_layered == 1)
_gdk_win32_surface_update_style_bits (surface);
/* Ensure that any other context is created with a legacy bit set */
gdk_gl_context_set_is_legacy (context, legacy_bit);
return TRUE;
}
static void
gdk_win32_gl_context_class_init (GdkWin32GLContextClass *klass)
{
GdkGLContextClass *gl_context_class = GDK_GL_CONTEXT_CLASS(klass);
GdkDrawContextClass *draw_context_class = GDK_DRAW_CONTEXT_CLASS(klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gl_context_class->realize = gdk_win32_gl_context_realize;
draw_context_class->begin_frame = gdk_win32_gl_context_begin_frame;
draw_context_class->end_frame = gdk_win32_gl_context_end_frame;
gobject_class->dispose = _gdk_win32_gl_context_dispose;
}
static void
gdk_win32_gl_context_init (GdkWin32GLContext *self)
{
}
GdkGLContext *
_gdk_win32_surface_create_gl_context (GdkSurface *surface,
gboolean attached,
GdkGLContext *share,
GError **error)
{
GdkDisplay *display = gdk_surface_get_display (surface);
GdkWin32Display *display_win32 = GDK_WIN32_DISPLAY (display);
GdkWin32GLContext *context = NULL;
/* Acquire and store up the Windows-specific HWND and HDC */
/* HWND hwnd;*/
HDC hdc;
#ifdef GDK_WIN32_ENABLE_EGL
EGLContext egl_context;
EGLConfig config;
#endif
display_win32->gl_hwnd = GDK_SURFACE_HWND (surface);
hdc = GetDC (display_win32->gl_hwnd);
#ifdef GDK_WIN32_ENABLE_EGL
/* display_win32->hdc_egl_temp should *not* be destroyed here! It is destroyed at dispose()! */
display_win32->hdc_egl_temp = hdc;
#endif
if (!_gdk_win32_display_init_gl (display))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("No GL implementation is available"));
return NULL;
}
#if 0
if (display_win32->have_wgl)
{
hwnd = GDK_SURFACE_HWND (surface);
hdc = GetDC (hwnd);
display_win32->gl_hwnd = hwnd;
}
#endif
#ifdef GDK_WIN32_ENABLE_EGL
if (display_win32->have_egl && !find_eglconfig_for_window (display_win32, &config,
&display_win32->egl_min_swap_interval, error))
return NULL;
#endif
context = g_object_new (GDK_TYPE_WIN32_GL_CONTEXT,
"surface", surface,
"shared-context", share,
NULL);
context->gl_hdc = hdc;
context->is_attached = attached;
#ifdef GDK_WIN32_ENABLE_EGL
if (display_win32->have_egl)
context->egl_config = config;
#endif
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);
GdkSurface *surface;
gboolean do_frame_sync = FALSE;
if (context == NULL)
{
#ifdef GDK_WIN32_ENABLE_EGL
if (display_win32->egl_disp != EGL_NO_DISPLAY)
eglMakeCurrent(display_win32->egl_disp,
EGL_NO_SURFACE,
EGL_NO_SURFACE,
EGL_NO_CONTEXT);
else
#endif
wglMakeCurrent(NULL, NULL);
return TRUE;
}
context_win32 = GDK_WIN32_GL_CONTEXT (context);
if (!gdk_gl_context_get_use_es (context))
{
if (!wglMakeCurrent (context_win32->gl_hdc, context_win32->hglrc))
{
GDK_NOTE (OPENGL,
g_print ("Making WGL context current failed\n"));
return FALSE;
}
if (context_win32->is_attached && display_win32->hasWglEXTSwapControl)
{
surface = gdk_gl_context_get_surface (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. */
display = gdk_surface_get_display (surface);
do_frame_sync = ! gdk_display_is_composited (display);
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);
}
}
}
#ifdef GDK_WIN32_ENABLE_EGL
else
{
EGLSurface egl_surface;
surface = gdk_gl_context_get_surface (context);
if (context_win32->is_attached)
egl_surface = _gdk_win32_surface_get_egl_surface (surface, context_win32->egl_config, FALSE);
else
{
if (display_win32->hasEglSurfacelessContext)
egl_surface = EGL_NO_SURFACE;
else
egl_surface = _gdk_win32_surface_get_egl_surface (surface, context_win32->egl_config, TRUE);
}
if (!eglMakeCurrent (display_win32->egl_disp,
egl_surface,
egl_surface,
context_win32->egl_context))
{
g_warning ("eglMakeCurrent failed");
return FALSE;
}
if (display_win32->egl_min_swap_interval == 0)
eglSwapInterval (display_win32->egl_disp, 0);
else
g_debug ("Can't disable GL swap interval");
}
#endif
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
*/
gboolean
gdk_win32_display_get_wgl_version (GdkDisplay *display,
int *major,
int *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))
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;
}
void
_gdk_win32_surface_invalidate_egl_framebuffer (GdkSurface *surface)
{
/* If we are using ANGLE, we need to force redraw of the whole Window and its child windows
* as we need to re-acquire the EGL surfaces that we rendered to upload to Cairo explicitly,
* using gdk_window_invalidate_rect (), when we maximize or restore or use aerosnap
*/
#ifdef GDK_WIN32_ENABLE_EGL
if (surface->gl_paint_context != NULL && gdk_gl_context_get_use_es (surface->gl_paint_context))
{
GdkWin32Surface *impl = GDK_WIN32_SURFACE (surface);
impl->egl_force_redraw_all = TRUE;
}
#endif
}
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