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gtk/gdk/x11/gdkglcontext-glx.c
Philip Withnall 680dba6524
gdk: Fix a maybe-uninitialized warning 
If there somehow end up being no `supported_versions`, `ctx` would end
up being dereferenced before being initialised. While I think that’s
unlikely, the compiler doesn’t know that, so let’s just initialise the
variable unconditionally.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>
2024-04-12 12:03:29 +01:00

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/* GDK - The GIMP Drawing Kit
*
* gdkglcontext-glx.c: GLX 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 "gdkx11property.h"
#include <X11/Xatom.h>
#include "gdkprofilerprivate.h"
#include <glib/gi18n-lib.h>
#include <cairo-xlib.h>
#include <epoxy/glx.h>
struct _GdkX11GLContextGLX
{
GdkX11GLContext parent_instance;
GLXContext glx_context;
#ifdef HAVE_XDAMAGE
GLsync frame_fence;
Damage xdamage;
#endif
guint do_frame_sync : 1;
};
typedef struct _GdkX11GLContextClass GdkX11GLContextGLXClass;
G_DEFINE_TYPE (GdkX11GLContextGLX, gdk_x11_gl_context_glx, GDK_TYPE_X11_GL_CONTEXT)
static GLXDrawable
gdk_x11_surface_get_glx_drawable (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->glx_drawable)
return self->glx_drawable;
self->glx_drawable = glXCreateWindow (gdk_x11_display_get_xdisplay (display),
display_x11->glx_config,
gdk_x11_surface_get_xid (surface),
NULL);
return self->glx_drawable;
}
void
gdk_x11_surface_destroy_glx_drawable (GdkX11Surface *self)
{
if (self->glx_drawable == None)
return;
gdk_gl_context_clear_current_if_surface (GDK_SURFACE (self));
glXDestroyWindow (gdk_x11_display_get_xdisplay (gdk_surface_get_display (GDK_SURFACE (self))),
self->glx_drawable);
self->glx_drawable = None;
}
static void
maybe_wait_for_vblank (GdkDisplay *display,
GLXDrawable drawable)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
Display *dpy = gdk_x11_display_get_xdisplay (display);
if (display_x11->has_glx_sync_control)
{
gint64 ust, msc, sbc;
glXGetSyncValuesOML (dpy, drawable, &ust, &msc, &sbc);
glXWaitForMscOML (dpy, drawable,
0, 2, (msc + 1) % 2,
&ust, &msc, &sbc);
}
else if (display_x11->has_glx_video_sync)
{
guint32 current_count;
glXGetVideoSyncSGI (&current_count);
glXWaitVideoSyncSGI (2, (current_count + 1) % 2, &current_count);
}
}
static GLXDrawable
gdk_x11_gl_context_glx_get_drawable (GdkX11GLContextGLX *self)
{
GdkDrawContext *draw_context = GDK_DRAW_CONTEXT (self);
GdkSurface *surface;
if (gdk_draw_context_is_in_frame (draw_context))
surface = gdk_draw_context_get_surface (draw_context);
else
surface = GDK_X11_DISPLAY (gdk_draw_context_get_display (draw_context))->leader_gdk_surface;
return gdk_x11_surface_get_glx_drawable (surface);
}
static void
gdk_x11_gl_context_glx_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted)
{
GdkX11GLContextGLX *self = GDK_X11_GL_CONTEXT_GLX (draw_context);
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkSurface *surface = gdk_gl_context_get_surface (context);
GdkX11Surface *x11_surface = GDK_X11_SURFACE (surface);
GdkDisplay *display = gdk_gl_context_get_display (context);
Display *dpy = gdk_x11_display_get_xdisplay (display);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
GLXDrawable drawable;
GDK_DRAW_CONTEXT_CLASS (gdk_x11_gl_context_glx_parent_class)->end_frame (draw_context, painted);
gdk_gl_context_make_current (context);
drawable = gdk_x11_surface_get_glx_drawable (surface);
GDK_DISPLAY_DEBUG (display, OPENGL,
"Flushing GLX buffers for drawable %lu (window: %lu), frame sync: %s",
(unsigned long) drawable,
(unsigned long) gdk_x11_surface_get_xid (surface),
self->do_frame_sync ? "yes" : "no");
gdk_profiler_add_mark (GDK_PROFILER_CURRENT_TIME, 0, "x11", "swap buffers");
/* if we are going to wait for the vertical refresh manually
* we need to flush pending redraws, and we also need to wait
* for that to finish, otherwise we are going to tear.
*
* obviously, this condition should not be hit if we have
* GLX_SGI_swap_control, and we ask the driver to do the right
* thing.
*/
if (self->do_frame_sync)
{
guint32 end_frame_counter = 0;
gboolean has_counter = display_x11->has_glx_video_sync;
gboolean can_wait = display_x11->has_glx_video_sync || display_x11->has_glx_sync_control;
if (display_x11->has_glx_video_sync)
glXGetVideoSyncSGI (&end_frame_counter);
if (self->do_frame_sync && !display_x11->has_glx_sgi_swap_control && !display_x11->has_glx_swap_control)
{
glFinish ();
if (has_counter && can_wait)
{
if (x11_surface->glx_frame_counter == end_frame_counter)
maybe_wait_for_vblank (display, drawable);
}
else if (can_wait)
maybe_wait_for_vblank (display, drawable);
}
}
gdk_x11_surface_pre_damage (surface);
#ifdef HAVE_XDAMAGE
if (self->xdamage != 0 && _gdk_x11_surface_syncs_frames (surface))
{
g_assert (self->frame_fence == 0);
self->frame_fence = glFenceSync (GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
/* We consider the frame still getting painted until the GL operation is
* finished, and the window gets damage reported from the X server.
* It's only at this point the compositor can be sure it has full
* access to the new updates.
*/
_gdk_x11_surface_set_frame_still_painting (surface, TRUE);
}
#endif
glXSwapBuffers (dpy, drawable);
if (self->do_frame_sync && display_x11->has_glx_video_sync)
glXGetVideoSyncSGI (&x11_surface->glx_frame_counter);
}
static gboolean
gdk_x11_gl_context_glx_clear_current (GdkGLContext *context)
{
GdkDisplay *display = gdk_gl_context_get_display (context);
Display *dpy = gdk_x11_display_get_xdisplay (display);
glXMakeContextCurrent (dpy, None, None, NULL);
return TRUE;
}
static gboolean
gdk_x11_gl_context_glx_is_current (GdkGLContext *context)
{
GdkX11GLContextGLX *self = GDK_X11_GL_CONTEXT_GLX (context);
return self->glx_context == glXGetCurrentContext ();
}
static gboolean
gdk_x11_gl_context_glx_make_current (GdkGLContext *context,
gboolean surfaceless)
{
GdkX11GLContextGLX *self = GDK_X11_GL_CONTEXT_GLX (context);
GdkDisplay *display = gdk_gl_context_get_display (context);
Display *dpy = gdk_x11_display_get_xdisplay (display);
gboolean do_frame_sync = FALSE;
GdkSurface *surface;
GLXWindow drawable;
if (!surfaceless)
surface = gdk_gl_context_get_surface (context);
else
surface = GDK_X11_DISPLAY (display)->leader_gdk_surface;
drawable = gdk_x11_surface_get_glx_drawable (surface);
GDK_DISPLAY_DEBUG (display, OPENGL,
"Making GLX context %p current to drawable %lu",
context, (unsigned long) drawable);
/* Work around a glitch, see
* https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/5281
*/
if (glXGetCurrentContext () != self->glx_context)
glXMakeContextCurrent (dpy, None, None, NULL);
if (!glXMakeContextCurrent (dpy, drawable, drawable, self->glx_context))
return FALSE;
if (!surfaceless)
{
/* 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 (GDK_X11_DISPLAY (display)->has_glx_swap_control)
{
if (do_frame_sync != self->do_frame_sync)
{
self->do_frame_sync = do_frame_sync;
if (do_frame_sync)
glXSwapIntervalEXT (dpy, drawable, 1);
else
glXSwapIntervalEXT (dpy, drawable, 0);
}
}
else if (GDK_X11_DISPLAY (display)->has_glx_sgi_swap_control)
{
/* 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 != self->do_frame_sync)
{
self->do_frame_sync = do_frame_sync;
if (do_frame_sync)
glXSwapIntervalSGI (1);
else
glXSwapIntervalSGI (0);
}
}
}
return TRUE;
}
static cairo_region_t *
gdk_x11_gl_context_glx_get_damage (GdkGLContext *context)
{
GdkDisplay *display = gdk_draw_context_get_display (GDK_DRAW_CONTEXT (context));
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
Display *dpy = gdk_x11_display_get_xdisplay (display);
unsigned int buffer_age = 0;
if (display_x11->has_glx_buffer_age)
{
GdkX11GLContextGLX *self = GDK_X11_GL_CONTEXT_GLX (context);
gdk_gl_context_make_current (context);
glXQueryDrawable (dpy, gdk_x11_gl_context_glx_get_drawable (self),
GLX_BACK_BUFFER_AGE_EXT, &buffer_age);
if (buffer_age > 0 && buffer_age <= GDK_GL_MAX_TRACKED_BUFFERS)
{
cairo_region_t *damage = cairo_region_create ();
int i;
for (i = 0; i < buffer_age - 1; i++)
{
if (context->old_updated_area[i] == NULL)
{
cairo_region_destroy (damage);
return GDK_GL_CONTEXT_CLASS (gdk_x11_gl_context_glx_parent_class)->get_damage (context);
}
cairo_region_union (damage, context->old_updated_area[i]);
}
return damage;
}
}
return GDK_GL_CONTEXT_CLASS (gdk_x11_gl_context_glx_parent_class)->get_damage (context);
}
#ifdef HAVE_XDAMAGE
static void
bind_context_for_frame_fence (GdkX11GLContextGLX *self)
{
GdkX11GLContextGLX *current_context_glx;
GLXContext current_glx_context = NULL;
GdkGLContext *current_context;
gboolean needs_binding = TRUE;
/* We don't care if the passed context is the current context,
* necessarily, but we do care that *some* context that can
* see the sync object is bound.
*
* If no context is bound at all, the GL dispatch layer will
* make glClientWaitSync() silently return 0.
*/
current_glx_context = glXGetCurrentContext ();
if (current_glx_context == NULL)
goto out;
current_context = gdk_gl_context_get_current ();
if (current_context == NULL)
goto out;
current_context_glx = GDK_X11_GL_CONTEXT_GLX (current_context);
/* If the GLX context was changed out from under GDK, then
* that context may not be one that is able to see the
* created fence object.
*/
if (current_context_glx->glx_context != current_glx_context)
goto out;
needs_binding = FALSE;
out:
if (needs_binding)
gdk_gl_context_make_current (GDK_GL_CONTEXT (self));
}
static void
finish_frame (GdkGLContext *context)
{
GdkX11GLContextGLX *context_glx = GDK_X11_GL_CONTEXT_GLX (context);
GdkSurface *surface = gdk_gl_context_get_surface (context);
if (context_glx->xdamage == 0)
return;
if (context_glx->frame_fence == 0)
return;
glDeleteSync (context_glx->frame_fence);
context_glx->frame_fence = 0;
_gdk_x11_surface_set_frame_still_painting (surface, FALSE);
}
static gboolean
on_gl_surface_xevent (GdkGLContext *context,
XEvent *xevent,
GdkX11Display *display_x11)
{
GdkX11GLContextGLX *context_glx = GDK_X11_GL_CONTEXT_GLX (context);
XDamageNotifyEvent *damage_xevent;
if (xevent->type != (display_x11->damage_event_base + XDamageNotify))
return FALSE;
damage_xevent = (XDamageNotifyEvent *) xevent;
if (damage_xevent->damage != context_glx->xdamage)
return FALSE;
if (context_glx->frame_fence)
{
GLenum wait_result;
bind_context_for_frame_fence (context_glx);
wait_result = glClientWaitSync (context_glx->frame_fence, 0, 0);
switch (wait_result)
{
/* We assume that if the fence has been signaled, that this damage
* event is the damage event that was triggered by the GL drawing
* associated with the fence. That's, technically, not necessarily
* always true. The X server could have generated damage for
* an unrelated event (say the size of the window changing), at
* just the right moment such that we're picking it up instead.
*
* We're choosing not to handle this edge case, but if it does ever
* happen in the wild, it could lead to slight underdrawing by
* the compositor for one frame. In the future, if we find out
* this edge case is noticeable, we can compensate by copying the
* painted region from gdk_x11_gl_context_end_frame and subtracting
* damaged areas from the copy as they come in. Once the copied
* region goes empty, we know that there won't be any underdraw,
* and can mark painting has finished. It's not worth the added
* complexity and resource usage to do this bookkeeping, however,
* unless the problem is practically visible.
*/
case GL_ALREADY_SIGNALED:
case GL_CONDITION_SATISFIED:
case GL_WAIT_FAILED:
if (wait_result == GL_WAIT_FAILED)
g_warning ("failed to wait on GL fence associated with last swap buffers call");
finish_frame (context);
break;
/* We assume that if the fence hasn't been signaled, that this
* damage event is not the damage event that was triggered by the
* GL drawing associated with the fence. That's only true for
* the Nvidia vendor driver. When using open source drivers, damage
* is emitted immediately on swap buffers, before the fence ever
* has a chance to signal.
*/
case GL_TIMEOUT_EXPIRED:
break;
default:
g_error ("glClientWaitSync returned unexpected result: %x", (guint) wait_result);
}
}
return FALSE;
}
static void
on_surface_state_changed (GdkGLContext *context)
{
GdkSurface *surface = gdk_gl_context_get_surface (context);
if (GDK_SURFACE_IS_MAPPED (surface))
return;
/* If we're about to withdraw the surface, then we don't care if the frame is
* still getting rendered by the GPU. The compositor is going to remove the surface
* from the scene anyway, so wrap up the frame.
*/
finish_frame (context);
}
#endif /* HAVE_XDAMAGE */
#define N_GLX_ATTRS 16
static GdkGLAPI
gdk_x11_context_create_glx_context (GdkGLContext *context,
GdkGLAPI api,
gboolean legacy)
{
GdkX11GLContextGLX *context_glx = GDK_X11_GL_CONTEXT_GLX (context);;
GdkDisplay *display = gdk_gl_context_get_display (context);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
Display *dpy = gdk_x11_display_get_xdisplay (display);
GdkGLContext *share = gdk_display_get_gl_context (display);
GdkX11GLContextGLX *share_glx = NULL;
GdkSurface *surface = gdk_gl_context_get_surface (context);
GLXContext ctx = NULL;
int context_attribs[N_GLX_ATTRS], i = 0, flags = 0;
gsize major_idx, minor_idx;
GdkGLVersion version;
const GdkGLVersion* supported_versions;
gboolean debug_bit, compat_bit;
gsize j;
if (!gdk_gl_context_is_api_allowed (context, api, NULL))
return 0;
if (api == GDK_GL_API_GLES && legacy)
return 0;
/* We will use the default version matching the context status
* unless the user requested a version which makes sense */
gdk_gl_context_get_matching_version (context, api, legacy, &version);
debug_bit = gdk_gl_context_get_debug_enabled (context);
compat_bit = gdk_gl_context_get_forward_compatible (context);
if (debug_bit)
flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
if (compat_bit)
flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
context_attribs[i++] = GLX_CONTEXT_PROFILE_MASK_ARB;
if (api == GDK_GL_API_GL)
if (legacy)
context_attribs[i++] = GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
else
context_attribs[i++] = GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
else if (api == GDK_GL_API_GLES)
context_attribs[i++] = GLX_CONTEXT_ES2_PROFILE_BIT_EXT;
context_attribs[i++] = GLX_CONTEXT_MAJOR_VERSION_ARB;
major_idx = i++;
context_attribs[i++] = GLX_CONTEXT_MINOR_VERSION_ARB;
minor_idx = i++;
context_attribs[i++] = GLX_CONTEXT_FLAGS_ARB;
context_attribs[i++] = flags;
context_attribs[i++] = None;
g_assert (i < N_GLX_ATTRS);
GDK_DISPLAY_DEBUG (display, OPENGL,
"Creating GLX context version %d.%d (debug:%s, forward:%s, legacy:%s, es:%s)",
gdk_gl_version_get_major (&version), gdk_gl_version_get_minor (&version),
debug_bit ? "yes" : "no",
compat_bit ? "yes" : "no",
legacy ? "yes" : "no",
api == GDK_GL_API_GLES ? "yes" : "no");
if (share != NULL)
share_glx = GDK_X11_GL_CONTEXT_GLX (share);
supported_versions = gdk_gl_versions_get_for_api (api);
for (j = 0; gdk_gl_version_greater_equal (&supported_versions[j], &version); j++)
{
context_attribs [major_idx] = gdk_gl_version_get_major (&supported_versions[j]);
context_attribs [minor_idx] = gdk_gl_version_get_minor (&supported_versions[j]);
/* If we don't have access to GLX_ARB_create_context_profile, then
* we have to fall back to the old GLX 1.3 API.
*/
if (legacy && !display_x11->has_glx_create_context)
ctx = glXCreateNewContext (gdk_x11_display_get_xdisplay (display),
display_x11->glx_config,
GLX_RGBA_TYPE,
share_glx != NULL ? share_glx->glx_context : NULL,
TRUE);
else
ctx = glXCreateContextAttribsARB (gdk_x11_display_get_xdisplay (display),
display_x11->glx_config,
share_glx != NULL ? share_glx->glx_context : NULL,
True,
context_attribs);
if (ctx != NULL)
break;
}
if (ctx == NULL)
{
GDK_DISPLAY_DEBUG (display, OPENGL, "Failed to create a GLX context");
return 0;
}
GDK_DISPLAY_DEBUG (display, OPENGL,
"Realized GLX context[%p], %s, version: %d.%d",
context_glx->glx_context,
glXIsDirect (dpy, context_glx->glx_context) ? "direct" : "indirect",
display_x11->glx_version / 10,
display_x11->glx_version % 10);
context_glx->glx_context = ctx;
gdk_gl_context_set_version (context, &supported_versions[j]);
gdk_gl_context_set_is_legacy (context, legacy);
#ifdef HAVE_XDAMAGE
if (display_x11->have_damage &&
display_x11->has_async_glx_swap_buffers)
{
gdk_x11_display_error_trap_push (display);
context_glx->xdamage = XDamageCreate (dpy,
gdk_x11_surface_get_xid (surface),
XDamageReportRawRectangles);
if (gdk_x11_display_error_trap_pop (display))
{
context_glx->xdamage = 0;
}
else
{
g_signal_connect_object (G_OBJECT (display),
"xevent",
G_CALLBACK (on_gl_surface_xevent),
context,
G_CONNECT_SWAPPED);
g_signal_connect_object (G_OBJECT (surface),
"notify::state",
G_CALLBACK (on_surface_state_changed),
context,
G_CONNECT_SWAPPED);
}
}
#endif
return api;
}
static GdkGLAPI
gdk_x11_gl_context_glx_realize (GdkGLContext *context,
GError **error)
{
GdkDisplay *display = gdk_gl_context_get_display (context);
GdkGLContext *share = gdk_display_get_gl_context (display);
gboolean legacy;
GdkGLAPI api, preferred_api;
if (share && gdk_gl_context_is_api_allowed (context,
gdk_gl_context_get_api (share),
NULL))
preferred_api = gdk_gl_context_get_api (share);
else if (gdk_gl_context_is_api_allowed (context, GDK_GL_API_GL, NULL))
preferred_api = GDK_GL_API_GL;
else if (gdk_gl_context_is_api_allowed (context, GDK_GL_API_GLES, NULL))
preferred_api = GDK_GL_API_GLES;
else
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("No GL API allowed."));
return 0;
}
/* If there is no glXCreateContextAttribsARB() then we default to legacy */
legacy = !GDK_X11_DISPLAY (display)->has_glx_create_context;
/* We cannot share legacy contexts with core profile ones, so the
* shared context is the one that decides if we're going to create
* a legacy context or not.
*/
if (share != NULL && gdk_gl_context_is_legacy (share))
legacy = TRUE;
gdk_x11_display_error_trap_push (display);
/* Increase XNextRequest because GLX may fake errors with the last request
* and we want the error trap to catch them */
XChangeWindowAttributes (GDK_DISPLAY_XDISPLAY (display),
GDK_X11_DISPLAY (display)->leader_window,
0,
(XSetWindowAttributes[1]) { 0, });
if (preferred_api == GDK_GL_API_GL)
{
api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GL, legacy);
if (api == 0)
api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GLES, legacy);
if (api == 0)
api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GL, TRUE);
}
else
{
api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GLES, FALSE);
if (api == 0)
api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GL, legacy);
if (api == 0)
api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GL, TRUE);
}
gdk_x11_display_error_trap_pop_ignored (display);
if (api == 0)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
}
return api;
}
#undef N_GLX_ATTRS
static void
gdk_x11_gl_context_glx_dispose (GObject *gobject)
{
GdkX11GLContextGLX *context_glx = GDK_X11_GL_CONTEXT_GLX (gobject);
#ifdef HAVE_XDAMAGE
context_glx->xdamage = 0;
#endif
if (context_glx->glx_context != NULL)
{
GdkGLContext *context = GDK_GL_CONTEXT (gobject);
GdkDisplay *display = gdk_gl_context_get_display (context);
Display *dpy = gdk_x11_display_get_xdisplay (display);
if (glXGetCurrentContext () == context_glx->glx_context)
glXMakeContextCurrent (dpy, None, None, NULL);
GDK_DISPLAY_DEBUG (display, OPENGL, "Destroying GLX context");
glXDestroyContext (dpy, context_glx->glx_context);
context_glx->glx_context = NULL;
}
G_OBJECT_CLASS (gdk_x11_gl_context_glx_parent_class)->dispose (gobject);
}
static void
gdk_x11_gl_context_glx_class_init (GdkX11GLContextGLXClass *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_GLX;
context_class->realize = gdk_x11_gl_context_glx_realize;
context_class->make_current = gdk_x11_gl_context_glx_make_current;
context_class->clear_current = gdk_x11_gl_context_glx_clear_current;
context_class->is_current = gdk_x11_gl_context_glx_is_current;
context_class->get_damage = gdk_x11_gl_context_glx_get_damage;
draw_context_class->end_frame = gdk_x11_gl_context_glx_end_frame;
gobject_class->dispose = gdk_x11_gl_context_glx_dispose;
}
static void
gdk_x11_gl_context_glx_init (GdkX11GLContextGLX *self)
{
self->do_frame_sync = TRUE;
}
static gboolean
visual_is_rgba (XVisualInfo *visinfo)
{
return
visinfo->depth == 32 &&
visinfo->visual->red_mask == 0xff0000 &&
visinfo->visual->green_mask == 0x00ff00 &&
visinfo->visual->blue_mask == 0x0000ff;
}
#define MAX_GLX_ATTRS 30
static gboolean
gdk_x11_display_create_glx_config (GdkX11Display *self,
Visual **out_visual,
int *out_depth,
GError **error)
{
GdkDisplay *display = GDK_DISPLAY (self);
Display *dpy = gdk_x11_display_get_xdisplay (display);
int attrs[MAX_GLX_ATTRS];
GLXFBConfig *configs;
int count;
enum {
NO_VISUAL_FOUND,
WITH_MULTISAMPLING,
WITH_STENCIL_AND_DEPTH_BUFFER,
NO_ALPHA,
NO_ALPHA_VISUAL,
PERFECT
} best_features;
int i = 0;
attrs[i++] = GLX_DRAWABLE_TYPE;
attrs[i++] = GLX_WINDOW_BIT;
attrs[i++] = GLX_RENDER_TYPE;
attrs[i++] = GLX_RGBA_BIT;
attrs[i++] = GLX_DOUBLEBUFFER;
attrs[i++] = GL_TRUE;
attrs[i++] = GLX_RED_SIZE;
attrs[i++] = 1;
attrs[i++] = GLX_GREEN_SIZE;
attrs[i++] = 1;
attrs[i++] = GLX_BLUE_SIZE;
attrs[i++] = 1;
attrs[i++] = GLX_ALPHA_SIZE;
attrs[i++] = 1;
attrs[i++] = None;
g_assert (i < MAX_GLX_ATTRS);
configs = glXChooseFBConfig (dpy, DefaultScreen (dpy), attrs, &count);
if (configs == NULL || count == 0)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("No GLX configurations available"));
return FALSE;
}
best_features = NO_VISUAL_FOUND;
for (i = 0; i < count; i++)
{
XVisualInfo *visinfo;
int tmp;
visinfo = glXGetVisualFromFBConfig (dpy, configs[i]);
if (visinfo == NULL)
continue;
if (glXGetFBConfigAttrib (dpy, configs[i], GLX_SAMPLE_BUFFERS_ARB, &tmp) != Success || tmp != 0)
{
if (best_features < WITH_MULTISAMPLING)
{
GDK_DISPLAY_DEBUG (display, OPENGL, "Best GLX config is %u for visual 0x%lX with multisampling", i, visinfo->visualid);
best_features = WITH_MULTISAMPLING;
*out_visual = visinfo->visual;
*out_depth = visinfo->depth;
self->glx_config = configs[i];
}
XFree (visinfo);
continue;
}
if (glXGetFBConfigAttrib (dpy, configs[i], GLX_DEPTH_SIZE, &tmp) != Success || tmp != 0 ||
glXGetFBConfigAttrib (dpy, configs[i], GLX_STENCIL_SIZE, &tmp) != Success || tmp != 0)
{
if (best_features < WITH_STENCIL_AND_DEPTH_BUFFER)
{
GDK_DISPLAY_DEBUG (display, OPENGL, "Best GLX config is %u for visual 0x%lX with a stencil or depth buffer", i, visinfo->visualid);
best_features = WITH_STENCIL_AND_DEPTH_BUFFER;
*out_visual = visinfo->visual;
*out_depth = visinfo->depth;
self->glx_config = configs[i];
}
XFree (visinfo);
continue;
}
if (!visual_is_rgba (visinfo))
{
if (best_features < NO_ALPHA_VISUAL)
{
GDK_DISPLAY_DEBUG (display, OPENGL, "Best GLX config is %u for visual 0x%lX with no RGBA Visual", i, visinfo->visualid);
best_features = NO_ALPHA_VISUAL;
*out_visual = visinfo->visual;
*out_depth = visinfo->depth;
self->glx_config = configs[i];
}
XFree (visinfo);
continue;
}
GDK_DISPLAY_DEBUG (display, OPENGL, "GLX config %u for visual 0x%lX is the perfect choice", i, visinfo->visualid);
best_features = PERFECT;
*out_visual = visinfo->visual;
*out_depth = visinfo->depth;
self->glx_config = configs[i];
XFree (visinfo);
break;
}
XFree (configs);
if (best_features == NO_VISUAL_FOUND)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("No GLX configuration with required features found"));
return FALSE;
}
return TRUE;
}
#undef MAX_GLX_ATTRS
/**
* gdk_x11_display_get_glx_version:
* @display: (type GdkX11Display): a `GdkDisplay`
* @major: (out): return location for the GLX major version
* @minor: (out): return location for the GLX minor version
*
* Retrieves the version of the GLX implementation.
*
* Returns: %TRUE if GLX is available
*/
gboolean
gdk_x11_display_get_glx_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->glx_config == NULL)
return FALSE;
if (major != NULL)
*major = display_x11->glx_version / 10;
if (minor != NULL)
*minor = display_x11->glx_version % 10;
return TRUE;
}
/*< private >
* gdk_x11_display_init_glx:
* @display_x11: an X11 display that has not been inited yet.
* @out_visual: set to the Visual to be used with the returned config
* @out_depth: set to the depth to be used with the returned config
* @error: Return location for error
*
* Initializes the cached GLX state for the given @screen.
*
* This function must be called exactly once during initialization.
*
* Returns: %TRUE if GLX was initialized
*/
gboolean
gdk_x11_display_init_glx (GdkX11Display *display_x11,
Visual **out_visual,
int *out_depth,
GError **error)
{
GdkDisplay *display = GDK_DISPLAY (display_x11);
Display *dpy;
int screen_num;
if (!gdk_gl_backend_can_be_used (GDK_GL_GLX, error))
return FALSE;
dpy = gdk_x11_display_get_xdisplay (display);
if (!epoxy_has_glx (dpy))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("GLX is not supported"));
return FALSE;
}
screen_num = display_x11->screen->screen_num;
display_x11->glx_version = epoxy_glx_version (dpy, screen_num);
display_x11->has_glx_create_context =
epoxy_has_glx_extension (dpy, screen_num, "GLX_ARB_create_context_profile");
display_x11->has_glx_create_es2_context =
epoxy_has_glx_extension (dpy, screen_num, "GLX_EXT_create_context_es2_profile");
display_x11->has_glx_sgi_swap_control =
epoxy_has_glx_extension (dpy, screen_num, "GLX_SGI_swap_control");
display_x11->has_glx_swap_control =
epoxy_has_glx_extension (dpy, screen_num, "GLX_EXT_swap_control");
display_x11->has_glx_texture_from_pixmap =
epoxy_has_glx_extension (dpy, screen_num, "GLX_EXT_texture_from_pixmap");
display_x11->has_glx_video_sync =
epoxy_has_glx_extension (dpy, screen_num, "GLX_SGI_video_sync");
display_x11->has_glx_buffer_age =
epoxy_has_glx_extension (dpy, screen_num, "GLX_EXT_buffer_age");
display_x11->has_glx_sync_control =
epoxy_has_glx_extension (dpy, screen_num, "GLX_OML_sync_control");
display_x11->has_glx_multisample =
epoxy_has_glx_extension (dpy, screen_num, "GLX_ARB_multisample");
display_x11->has_glx_visual_rating =
epoxy_has_glx_extension (dpy, screen_num, "GLX_EXT_visual_rating");
if (g_strcmp0 (glXGetClientString (dpy, GLX_VENDOR), "NVIDIA Corporation") == 0)
{
Atom type;
int format;
gulong nitems;
gulong bytes_after;
guchar *data = NULL;
/* With the mesa based drivers, we can safely assume the compositor can
* access the updated surface texture immediately after glXSwapBuffers is
* run, because the kernel ensures there is an implicit synchronization
* operation upon texture access. This is not true with the Nvidia vendor
* driver. There is a window of time after glXSwapBuffers before other
* processes can see the updated drawing. We need to take special care,
* in that case, to defer telling the compositor our latest frame is
* ready until after the GPU has completed all issued commands related
* to the frame, and that the X server says the frame has been drawn.
*
* As this can cause deadlocks, we want to make sure to only enable it for Xorg,
* but not for XWayland, Xnest or whatever other X servers exist.
*/
gdk_x11_display_error_trap_push (display);
if (XGetWindowProperty (dpy, DefaultRootWindow (dpy),
gdk_x11_get_xatom_by_name_for_display (display, "XFree86_VT"),
0, 1, False, AnyPropertyType,
&type, &format, &nitems, &bytes_after, &data) == Success)
{
if (type != None)
display_x11->has_async_glx_swap_buffers = TRUE;
}
gdk_x11_display_error_trap_pop_ignored (display);
if (data)
XFree (data);
}
if (!gdk_x11_display_create_glx_config (display_x11, out_visual, out_depth, error))
return FALSE;
GDK_DISPLAY_DEBUG (display, OPENGL,
"GLX version %d.%d found\n"
" - Vendor: %s\n"
" - Checked extensions:\n"
"\t* GLX_ARB_create_context_profile: %s\n"
"\t* GLX_EXT_create_context_es2_profile: %s\n"
"\t* GLX_SGI_swap_control: %s\n"
"\t* GLX_EXT_swap_control: %s\n"
"\t* GLX_EXT_texture_from_pixmap: %s\n"
"\t* GLX_SGI_video_sync: %s\n"
"\t* GLX_EXT_buffer_age: %s\n"
"\t* GLX_OML_sync_control: %s\n"
"\t* GLX_ARB_multisample: %s\n"
"\t* GLX_EXT_visual_rating: %s",
display_x11->glx_version / 10,
display_x11->glx_version % 10,
glXGetClientString (dpy, GLX_VENDOR),
display_x11->has_glx_create_context ? "yes" : "no",
display_x11->has_glx_create_es2_context ? "yes" : "no",
display_x11->has_glx_sgi_swap_control ? "yes" : "no",
display_x11->has_glx_swap_control ? "yes" : "no",
display_x11->has_glx_texture_from_pixmap ? "yes" : "no",
display_x11->has_glx_video_sync ? "yes" : "no",
display_x11->has_glx_buffer_age ? "yes" : "no",
display_x11->has_glx_sync_control ? "yes" : "no",
display_x11->has_glx_multisample ? "yes" : "no",
display_x11->has_glx_visual_rating ? "yes" : "no");
return TRUE;
}
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