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gtk2/gdk/x11/gdkglcontext-egl.c
Benjamin Otte ca8d9fbe0b x11: Rework Visual selection 
Instead of going via GdkVisual, doing a preselection and letting the GL
initialization improve it, let the GL initialization pick an X Visual
directly using X Visual code directly.

The code should select the same visuals as before as it tries to apply
the same logic, but it's a rewrite, so I expect I messed something up.
2021-07-22 16:06:06 +02:00

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/* GDK - The GIMP Drawing Kit
*
* gdkglcontext-egl.c: EGL-X11 specific wrappers
*
* SPDX-FileCopyrightText: 2014 Emmanuele Bassi
* SPDX-FileCopyrightText: 2021 GNOME Foundation
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include "gdkglcontext-x11.h"
#include "gdkdisplay-x11.h"
#include "gdkprivate-x11.h"
#include "gdkscreen-x11.h"
#include "gdkx11display.h"
#include "gdkx11glcontext.h"
#include "gdkx11screen.h"
#include "gdkx11surface.h"
#include "gdkvisual-x11.h"
#include "gdkx11property.h"
#include <X11/Xatom.h>
#include "gdkinternals.h"
#include "gdkprofilerprivate.h"
#include "gdkintl.h"
#include <cairo-xlib.h>
#include <epoxy/egl.h>
struct _GdkX11GLContextEGL
{
GdkX11GLContext parent_instance;
EGLContext egl_context;
};
typedef struct {
EGLDisplay egl_display;
EGLConfig egl_config;
EGLSurface egl_surface;
/* Only set by the dummy surface we attach to the display */
Display *xdisplay;
Window dummy_xwin;
XVisualInfo *xvisinfo;
} DrawableInfo;
typedef struct _GdkX11GLContextClass GdkX11GLContextEGLClass;
G_DEFINE_TYPE (GdkX11GLContextEGL, gdk_x11_gl_context_egl, GDK_TYPE_X11_GL_CONTEXT)
static void
drawable_info_free (gpointer data)
{
DrawableInfo *info = data;
if (data == NULL)
return;
if (info->egl_surface != NULL)
{
eglDestroySurface (info->egl_display, info->egl_surface);
info->egl_surface = NULL;
}
if (info->dummy_xwin != None)
{
XDestroyWindow (info->xdisplay, info->dummy_xwin);
info->dummy_xwin = None;
}
if (info->xvisinfo != NULL)
{
XFree (info->xvisinfo);
info->xvisinfo = NULL;
}
g_free (info);
}
/**
* gdk_x11_display_get_egl_display:
* @display: (type GdkX11Display): an X11 display
*
* Retrieves the EGL display connection object for the given GDK display.
*
* This function returns `NULL` if GDK is using GLX.
*
* Returns: (nullable): the EGL display object
*
* Since: 4.4
*/
gpointer
gdk_x11_display_get_egl_display (GdkDisplay *display)
{
GdkX11Display *self;
g_return_val_if_fail (GDK_IS_X11_DISPLAY (display), NULL);
self = GDK_X11_DISPLAY (display);
return self->egl_display;
}
static void
gdk_x11_display_create_egl_display (GdkX11Display *self)
{
Display *dpy;
g_assert (self->egl_display == NULL);
dpy = gdk_x11_display_get_xdisplay (GDK_DISPLAY (self));
if (epoxy_has_egl_extension (NULL, "EGL_KHR_platform_base"))
{
PFNEGLGETPLATFORMDISPLAYPROC getPlatformDisplay =
(void *) eglGetProcAddress ("eglGetPlatformDisplay");
if (getPlatformDisplay != NULL)
self->egl_display = getPlatformDisplay (EGL_PLATFORM_X11_KHR, dpy, NULL);
if (self->egl_display != NULL)
return;
}
if (epoxy_has_egl_extension (NULL, "EGL_EXT_platform_base"))
{
PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplay =
(void *) eglGetProcAddress ("eglGetPlatformDisplayEXT");
if (getPlatformDisplay)
self->egl_display = getPlatformDisplay (EGL_PLATFORM_X11_EXT, dpy, NULL);
if (self->egl_display != NULL)
return;
}
self->egl_display = eglGetDisplay ((EGLNativeDisplayType) dpy);
}
#define MAX_EGL_ATTRS 30
static void
gdk_x11_display_create_egl_config (GdkX11Display *display)
{
GdkX11Display *self = GDK_X11_DISPLAY (display);
EGLint attrs[MAX_EGL_ATTRS];
EGLint count;
int i = 0;
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++] = 8;
attrs[i++] = EGL_GREEN_SIZE;
attrs[i++] = 8;
attrs[i++] = EGL_BLUE_SIZE;
attrs[i++] = 8;
attrs[i++] = EGL_ALPHA_SIZE;
attrs[i++] = 8;
attrs[i++] = EGL_NONE;
g_assert (i < MAX_EGL_ATTRS);
/* Pick first valid configuration that the driver returns us */
if (!eglChooseConfig (self->egl_display, attrs, &display->egl_config, 1, &count) && count >= 1)
display->egl_config = NULL;
}
#undef MAX_EGL_ATTRS
static XVisualInfo *
get_visual_info_for_egl_config (GdkDisplay *display,
EGLConfig egl_config)
{
XVisualInfo visinfo_template;
int template_mask = 0;
XVisualInfo *visinfo = NULL;
int visinfos_count;
EGLint visualid, red_size, green_size, blue_size, alpha_size;
EGLDisplay egl_display = GDK_X11_DISPLAY (display)->egl_display;
eglGetConfigAttrib (egl_display, egl_config, EGL_NATIVE_VISUAL_ID, &visualid);
if (visualid != 0)
{
visinfo_template.visualid = visualid;
template_mask |= VisualIDMask;
}
else
{
/* some EGL drivers don't implement the EGL_NATIVE_VISUAL_ID
* attribute, so attempt to find the closest match.
*/
eglGetConfigAttrib (egl_display, egl_config, EGL_RED_SIZE, &red_size);
eglGetConfigAttrib (egl_display, egl_config, EGL_GREEN_SIZE, &green_size);
eglGetConfigAttrib (egl_display, egl_config, EGL_BLUE_SIZE, &blue_size);
eglGetConfigAttrib (egl_display, egl_config, EGL_ALPHA_SIZE, &alpha_size);
visinfo_template.depth = red_size + green_size + blue_size + alpha_size;
template_mask |= VisualDepthMask;
visinfo_template.screen = DefaultScreen (gdk_x11_display_get_xdisplay (display));
template_mask |= VisualScreenMask;
}
visinfo = XGetVisualInfo (gdk_x11_display_get_xdisplay (display),
template_mask,
&visinfo_template,
&visinfos_count);
if (visinfos_count < 1)
return NULL;
return visinfo;
}
static EGLSurface
gdk_x11_display_get_egl_dummy_surface (GdkDisplay *display,
EGLConfig egl_config)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
DrawableInfo *info;
XVisualInfo *xvisinfo;
XSetWindowAttributes attrs;
info = g_object_get_data (G_OBJECT (display), "-gdk-x11-egl-dummy-surface");
if (info != NULL)
return info->egl_surface;
xvisinfo = get_visual_info_for_egl_config (display, egl_config);
if (xvisinfo == NULL)
return NULL;
info = g_new (DrawableInfo, 1);
info->xdisplay = gdk_x11_display_get_xdisplay (display);
info->xvisinfo = xvisinfo;
info->egl_display = GDK_X11_DISPLAY (display)->egl_display;
info->egl_config = egl_config;
attrs.override_redirect = True;
attrs.colormap = gdk_x11_display_get_window_colormap (display_x11);
attrs.border_pixel = 0;
info->dummy_xwin =
XCreateWindow (info->xdisplay,
DefaultRootWindow (info->xdisplay),
-100, -100, 1, 1,
0,
gdk_x11_display_get_window_depth (display_x11),
CopyFromParent,
gdk_x11_display_get_window_visual (display_x11),
CWOverrideRedirect | CWColormap | CWBorderPixel,
&attrs);
info->egl_surface =
eglCreateWindowSurface (info->egl_display,
info->egl_config,
(EGLNativeWindowType) info->dummy_xwin,
NULL);
g_object_set_data_full (G_OBJECT (display), "-gdk-x11-egl-dummy-surface",
info,
drawable_info_free);
return info->egl_surface;
}
static EGLSurface
gdk_x11_surface_get_egl_surface (GdkSurface *surface)
{
GdkX11Surface *self = GDK_X11_SURFACE (surface);
GdkDisplay *display = gdk_surface_get_display (GDK_SURFACE (self));
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
if (self->egl_surface)
return self->egl_surface;
self->egl_surface =
eglCreateWindowSurface (display_x11->egl_display,
display_x11->egl_config,
(EGLNativeWindowType) gdk_x11_surface_get_xid (surface),
NULL);
return self->egl_surface;
}
void
gdk_x11_surface_destroy_egl_surface (GdkX11Surface *self)
{
GdkX11Display *display_x11;
if (self->egl_surface == NULL)
return;
display_x11 = GDK_X11_DISPLAY (gdk_surface_get_display (GDK_SURFACE (self)));
eglDestroySurface (display_x11->egl_display, self->egl_surface);
self->egl_surface = NULL;
}
static void
gdk_x11_gl_context_egl_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkSurface *surface = gdk_gl_context_get_surface (context);
GdkDisplay *display = gdk_surface_get_display (surface);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
EGLSurface egl_surface;
GDK_DRAW_CONTEXT_CLASS (gdk_x11_gl_context_egl_parent_class)->end_frame (draw_context, painted);
if (gdk_gl_context_get_shared_context (context) != NULL)
return;
gdk_gl_context_make_current (context);
egl_surface = gdk_x11_surface_get_egl_surface (surface);
gdk_profiler_add_mark (GDK_PROFILER_CURRENT_TIME, 0, "x11", "swap buffers");
if (display_x11->has_egl_swap_buffers_with_damage)
{
int i, j, n_rects = cairo_region_num_rectangles (painted);
int surface_height = gdk_surface_get_height (surface);
int scale = gdk_surface_get_scale_factor (surface);
EGLint stack_rects[4 * 4]; /* 4 rects */
EGLint *heap_rects = NULL;
EGLint *rects;
if (n_rects < G_N_ELEMENTS (stack_rects) / 4)
rects = (EGLint *) &stack_rects;
else
rects = heap_rects = g_new (EGLint, n_rects * 4);
for (i = 0, j = 0; i < n_rects; i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (painted, i, &rect);
rects[j++] = rect.x * scale;
rects[j++] = (surface_height - rect.height - rect.y) * scale;
rects[j++] = rect.width * scale;
rects[j++] = rect.height * scale;
}
eglSwapBuffersWithDamageEXT (display_x11->egl_display, egl_surface, rects, n_rects);
g_free (heap_rects);
}
else
eglSwapBuffers (display_x11->egl_display, egl_surface);
}
static cairo_region_t *
gdk_x11_gl_context_egl_get_damage (GdkGLContext *context)
{
GdkDisplay *display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
if (display_x11->has_egl_buffer_age)
{
GdkSurface *surface = gdk_draw_context_get_surface (GDK_DRAW_CONTEXT (context));
GdkGLContext *shared = gdk_gl_context_get_shared_context (context);
EGLSurface egl_surface;
int buffer_age = 0;
shared = gdk_gl_context_get_shared_context (context);
if (shared == NULL)
shared = context;
egl_surface = gdk_x11_surface_get_egl_surface (surface);
gdk_gl_context_make_current (shared);
eglQuerySurface (display_x11->egl_display,
egl_surface,
EGL_BUFFER_AGE_EXT,
&buffer_age);
switch (buffer_age)
{
case 1:
return cairo_region_create ();
case 2:
if (context->old_updated_area[0])
return cairo_region_copy (context->old_updated_area[0]);
break;
case 3:
if (context->old_updated_area[0] && context->old_updated_area[1])
{
cairo_region_t *damage = cairo_region_copy (context->old_updated_area[0]);
cairo_region_union (damage, context->old_updated_area[1]);
return damage;
}
break;
default:
break;
}
}
return GDK_GL_CONTEXT_CLASS (gdk_x11_gl_context_egl_parent_class)->get_damage (context);
}
#define N_EGL_ATTRS 16
static gboolean
gdk_x11_gl_context_egl_realize (GdkGLContext *context,
GError **error)
{
GdkX11Display *display_x11;
GdkDisplay *display;
GdkX11GLContextEGL *context_egl;
GdkGLContext *share, *shared_data_context;
GdkSurface *surface;
gboolean debug_bit, forward_bit, legacy_bit, use_es;
int major, minor, i = 0;
EGLint context_attrs[N_EGL_ATTRS];
surface = gdk_gl_context_get_surface (context);
display = gdk_surface_get_display (surface);
context_egl = GDK_X11_GL_CONTEXT_EGL (context);
display_x11 = GDK_X11_DISPLAY (display);
share = gdk_gl_context_get_shared_context (context);
shared_data_context = gdk_surface_get_shared_data_gl_context (surface);
gdk_gl_context_get_required_version (context, &major, &minor);
debug_bit = gdk_gl_context_get_debug_enabled (context);
forward_bit = gdk_gl_context_get_forward_compatible (context);
legacy_bit = GDK_DISPLAY_DEBUG_CHECK (display, GL_LEGACY) ||
(share != NULL && gdk_gl_context_is_legacy (share));
use_es = GDK_DISPLAY_DEBUG_CHECK (display, GL_GLES) ||
(share != NULL && gdk_gl_context_get_use_es (share));
if (!use_es)
{
eglBindAPI (EGL_OPENGL_API);
if (display_x11->has_egl_khr_create_context)
{
int flags = 0;
if (debug_bit)
flags |= EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR;
if (forward_bit)
flags |= EGL_CONTEXT_OPENGL_FORWARD_COMPATIBLE_BIT_KHR;
context_attrs[i++] = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;
context_attrs[i++] = legacy_bit
? EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR
: EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;
context_attrs[i++] = EGL_CONTEXT_MAJOR_VERSION_KHR;
context_attrs[i++] = legacy_bit ? 3 : major;
context_attrs[i++] = EGL_CONTEXT_MINOR_VERSION_KHR;
context_attrs[i++] = legacy_bit ? 0 : minor;
context_attrs[i++] = EGL_CONTEXT_FLAGS_KHR;
context_attrs[i++] = flags;
context_attrs[i++] = EGL_NONE;
}
else
{
context_attrs[i++] = EGL_NONE;
}
}
else
{
eglBindAPI (EGL_OPENGL_ES_API);
context_attrs[i++] = EGL_CONTEXT_CLIENT_VERSION;
if (major == 3)
context_attrs[i++] = 3;
else
context_attrs[i++] = 2;
}
context_attrs[i++] = EGL_NONE;
g_assert (i < N_EGL_ATTRS);
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("Creating EGL context version %d.%d (shared:%s, debug:%s, forward:%s, legacy:%s, es:%s)",
major, minor,
share != NULL ? "yes" : "no",
debug_bit ? "yes" : "no",
forward_bit ? "yes" : "no",
legacy_bit ? "yes" : "no",
use_es ? "yes" : "no"));
context_egl->egl_context =
eglCreateContext (display_x11->egl_display,
display_x11->egl_config,
share != NULL
? GDK_X11_GL_CONTEXT_EGL (share)->egl_context
: shared_data_context != NULL
? GDK_X11_GL_CONTEXT_EGL (shared_data_context)->egl_context
: EGL_NO_CONTEXT,
context_attrs);
/* If we're not asking for a GLES context, and we don't have the legacy bit set
* already, try again with a legacy context
*/
if (context_egl->egl_context == NULL && !use_es && !legacy_bit)
{
context_attrs[1] = EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR;
context_attrs[3] = 3;
context_attrs[5] = 0;
legacy_bit = TRUE;
use_es = FALSE;
GDK_NOTE (OPENGL,
g_message ("Context creation failed; trying legacy EGL context"));
context_egl->egl_context =
eglCreateContext (display_x11->egl_display,
display_x11->egl_config,
share != NULL
? GDK_X11_GL_CONTEXT_EGL (share)->egl_context
: shared_data_context != NULL
? GDK_X11_GL_CONTEXT_EGL (shared_data_context)->egl_context
: EGL_NO_CONTEXT,
context_attrs);
}
if (context_egl->egl_context == NULL)
{
g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
return FALSE;
}
gdk_gl_context_set_is_legacy (context, legacy_bit);
gdk_gl_context_set_use_es (context, use_es);
GDK_NOTE (OPENGL,
g_message ("Realized EGL context[%p]",
context_egl->egl_context));
return TRUE;
}
#undef N_EGL_ATTRS
static void
gdk_x11_gl_context_egl_dispose (GObject *gobject)
{
GdkX11GLContextEGL *context_egl = GDK_X11_GL_CONTEXT_EGL (gobject);
if (context_egl->egl_context != NULL)
{
GdkGLContext *context = GDK_GL_CONTEXT (gobject);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (gdk_gl_context_get_display (context));
/* Unset the current context if we're disposing it */
if (eglGetCurrentContext () == context_egl->egl_context)
eglMakeCurrent (display_x11->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
GDK_NOTE (OPENGL, g_message ("Destroying EGL context"));
eglDestroyContext (display_x11->egl_display, context_egl->egl_context);
context_egl->egl_context = NULL;
}
G_OBJECT_CLASS (gdk_x11_gl_context_egl_parent_class)->dispose (gobject);
}
static void
gdk_x11_gl_context_egl_class_init (GdkX11GLContextEGLClass *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->realize = gdk_x11_gl_context_egl_realize;
context_class->get_damage = gdk_x11_gl_context_egl_get_damage;
draw_context_class->end_frame = gdk_x11_gl_context_egl_end_frame;
gobject_class->dispose = gdk_x11_gl_context_egl_dispose;
}
static void
gdk_x11_gl_context_egl_init (GdkX11GLContextEGL *self)
{
}
gboolean
gdk_x11_display_init_egl (GdkX11Display *self,
Visual **out_visual,
int *out_depth)
{
GdkDisplay *display = GDK_DISPLAY (self);
Display *dpy;
int major, minor;
dpy = gdk_x11_display_get_xdisplay (display);
if (!epoxy_has_egl ())
return FALSE;
gdk_x11_display_create_egl_display (self);
if (self->egl_display == NULL)
return FALSE;
if (!eglInitialize (self->egl_display, &major, &minor))
{
self->egl_display = NULL;
return FALSE;
}
gdk_x11_display_create_egl_config (self);
if (self->egl_config == NULL)
{
eglTerminate (self->egl_display);
self->egl_display = NULL;
return FALSE;
}
/* While NVIDIA might support EGL, it might very well not support
* all the EGL subset we rely on; we should be looking at more
* EGL extensions, but for the time being, this is a blanket
* fallback to GLX
*/
const char *vendor = eglQueryString (self->egl_display, EGL_VENDOR);
if (strstr (vendor, "NVIDIA") != NULL)
{
eglTerminate (self->egl_display);
self->egl_display = NULL;
return FALSE;
}
self->egl_version = epoxy_egl_version (dpy);
self->has_egl_khr_create_context =
epoxy_has_egl_extension (self->egl_display, "EGL_KHR_create_context");
self->has_egl_buffer_age =
epoxy_has_egl_extension (self->egl_display, "EGL_EXT_buffer_age");
self->has_egl_swap_buffers_with_damage =
epoxy_has_egl_extension (self->egl_display, "EGL_EXT_swap_buffers_with_damage");
self->has_egl_surfaceless_context =
epoxy_has_egl_extension (self->egl_display, "EGL_KHR_surfaceless_context");
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("EGL found\n"
" - Version: %s\n"
" - Vendor: %s\n"
" - Client API: %s\n"
" - Checked extensions:\n"
"\t* EGL_KHR_create_context: %s\n"
"\t* EGL_EXT_buffer_age: %s\n"
"\t* EGL_EXT_swap_buffers_with_damage: %s\n"
"\t* EGL_KHR_surfaceless_context: %s\n",
eglQueryString (self->egl_display, EGL_VERSION),
eglQueryString (self->egl_display, EGL_VENDOR),
eglQueryString (self->egl_display, EGL_CLIENT_APIS),
self->has_egl_khr_create_context ? "yes" : "no",
self->has_egl_buffer_age ? "yes" : "no",
self->has_egl_swap_buffers_with_damage ? "yes" : "no",
self->has_egl_surfaceless_context ? "yes" : "no"));
gdk_x11_display_query_default_visual (self, out_visual, out_depth);
return TRUE;
}
GdkX11GLContext *
gdk_x11_gl_context_egl_new (GdkSurface *surface,
gboolean attached,
GdkGLContext *share,
GError **error)
{
GdkX11GLContextEGL *context;
context = g_object_new (GDK_TYPE_X11_GL_CONTEXT_EGL,
"surface", surface,
"shared-context", share,
NULL);
return GDK_X11_GL_CONTEXT (context);
}
gboolean
gdk_x11_gl_context_egl_make_current (GdkDisplay *display,
GdkGLContext *context)
{
GdkX11GLContextEGL *context_egl = GDK_X11_GL_CONTEXT_EGL (context);
GdkX11GLContext *context_x11 = GDK_X11_GL_CONTEXT (context);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
GdkSurface *surface;
EGLSurface egl_surface;
if (context == NULL)
{
eglMakeCurrent (display_x11->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
return TRUE;
}
if (context_egl->egl_context == NULL)
{
g_critical ("No EGL context associated to the GdkGLContext; you must "
"call gdk_gl_context_realize() first.");
return FALSE;
}
surface = gdk_gl_context_get_surface (context);
if (context_x11->is_attached || gdk_draw_context_is_in_frame (GDK_DRAW_CONTEXT (context)))
egl_surface = gdk_x11_surface_get_egl_surface (surface);
else
{
if (display_x11->has_egl_surfaceless_context)
egl_surface = EGL_NO_SURFACE;
else
egl_surface = gdk_x11_display_get_egl_dummy_surface (display, display_x11->egl_config);
}
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("Making EGL context %p current to surface %p",
context_egl->egl_context, egl_surface));
if (!eglMakeCurrent (display_x11->egl_display, egl_surface, egl_surface, context_egl->egl_context))
{
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("Making EGL context current failed"));
return FALSE;
}
if (context_x11->is_attached)
{
gboolean do_frame_sync = FALSE;
/* If the WM 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_x11->do_frame_sync)
{
context_x11->do_frame_sync = do_frame_sync;
if (do_frame_sync)
eglSwapInterval (display_x11->egl_display, 1);
else
eglSwapInterval (display_x11->egl_display, 0);
}
}
return TRUE;
}
/**
* gdk_x11_display_get_egl_version:
* @display: (type GdkX11Display): a `GdkDisplay`
* @major: (out): return location for the EGL major version
* @minor: (out): return location for the EGL minor version
*
* Retrieves the version of the EGL implementation.
*
* Returns: %TRUE if EGL is available
*
* Since: 4.4
*/
gboolean
gdk_x11_display_get_egl_version (GdkDisplay *display,
int *major,
int *minor)
{
g_return_val_if_fail (GDK_IS_DISPLAY (display), FALSE);
if (!GDK_IS_X11_DISPLAY (display))
return FALSE;
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
if (display_x11->egl_display == NULL)
return FALSE;
if (major != NULL)
*major = display_x11->egl_version / 10;
if (minor != NULL)
*minor = display_x11->egl_version % 10;
return TRUE;
}
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