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gtk/gdk/x11/gdkglcontext-x11.c
Kjell Ahlstedt 0f6b91109e gdkglcontext-x11: Don't assume that cairo-xlib.h is in cairo directory 
If cairo is a subproject, it's not necessarily installed when gtk
is built. In the source tree, cairo's headers are not stored in
a directory called 'cairo'.
2021-03-16 11:47:16 +01:00

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/* GDK - The GIMP Drawing Kit
*
* gdkglcontext-x11.c: X11 specific OpenGL wrappers
*
* Copyright © 2014 Emmanuele Bassi
*
* 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 "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 "gdkintl.h"
#include <cairo-xlib.h>
#include <epoxy/glx.h>
G_DEFINE_TYPE (GdkX11GLContext, gdk_x11_gl_context, GDK_TYPE_GL_CONTEXT)
typedef struct {
GdkDisplay *display;
GLXDrawable glx_drawable;
Window dummy_xwin;
GLXWindow dummy_glx;
guint32 last_frame_counter;
} DrawableInfo;
static void
drawable_info_free (gpointer data_)
{
DrawableInfo *data = data_;
Display *dpy;
gdk_x11_display_error_trap_push (data->display);
dpy = gdk_x11_display_get_xdisplay (data->display);
if (data->glx_drawable)
glXDestroyWindow (dpy, data->glx_drawable);
if (data->dummy_glx)
glXDestroyWindow (dpy, data->dummy_glx);
if (data->dummy_xwin)
XDestroyWindow (dpy, data->dummy_xwin);
gdk_x11_display_error_trap_pop_ignored (data->display);
g_slice_free (DrawableInfo, data);
}
static DrawableInfo *
get_glx_drawable_info (GdkSurface *surface)
{
return g_object_get_data (G_OBJECT (surface), "-gdk-x11-surface-glx-info");
}
static void
set_glx_drawable_info (GdkSurface *surface,
DrawableInfo *info)
{
g_object_set_data_full (G_OBJECT (surface), "-gdk-x11-surface-glx-info",
info,
drawable_info_free);
}
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 void
gdk_x11_gl_context_end_frame (GdkDrawContext *draw_context,
cairo_region_t *painted)
{
GdkGLContext *context = GDK_GL_CONTEXT (draw_context);
GdkX11GLContext *context_x11 = GDK_X11_GL_CONTEXT (context);
GdkSurface *surface = gdk_gl_context_get_surface (context);
GdkDisplay *display = gdk_gl_context_get_display (context);
Display *dpy = gdk_x11_display_get_xdisplay (display);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
//GdkRectangle whole_window;
DrawableInfo *info;
GLXDrawable drawable;
GDK_DRAW_CONTEXT_CLASS (gdk_x11_gl_context_parent_class)->end_frame (draw_context, painted);
if (gdk_gl_context_get_shared_context (context))
return;
gdk_gl_context_make_current (context);
info = get_glx_drawable_info (surface);
drawable = context_x11->attached_drawable;
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("Flushing GLX buffers for drawable %lu (window: %lu), frame sync: %s",
(unsigned long) drawable,
(unsigned long) gdk_x11_surface_get_xid (surface),
context_x11->do_frame_sync ? "yes" : "no"));
/* 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 (context_x11->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 (context_x11->do_frame_sync && !display_x11->has_glx_swap_interval)
{
glFinish ();
if (has_counter && can_wait)
{
guint32 last_counter = info != NULL ? info->last_frame_counter : 0;
if (last_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 (context_x11->xdamage != 0 && _gdk_x11_surface_syncs_frames (surface))
{
g_assert (context_x11->frame_fence == 0);
context_x11->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 (context_x11->do_frame_sync && info != NULL && display_x11->has_glx_video_sync)
glXGetVideoSyncSGI (&info->last_frame_counter);
}
static cairo_region_t *
gdk_x11_gl_context_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)
{
GdkGLContext *shared;
GdkX11GLContext *shared_x11;
shared = gdk_gl_context_get_shared_context (context);
if (shared == NULL)
shared = context;
shared_x11 = GDK_X11_GL_CONTEXT (shared);
gdk_gl_context_make_current (shared);
glXQueryDrawable (dpy, shared_x11->attached_drawable,
GLX_BACK_BUFFER_AGE_EXT, &buffer_age);
switch (buffer_age)
{
case 1:
return cairo_region_create ();
break;
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:
;
}
}
return GDK_GL_CONTEXT_CLASS (gdk_x11_gl_context_parent_class)->get_damage (context);
}
static XVisualInfo *
find_xvisinfo_for_fbconfig (GdkDisplay *display,
GLXFBConfig config)
{
Display *dpy = gdk_x11_display_get_xdisplay (display);
return glXGetVisualFromFBConfig (dpy, config);
}
static GLXContext
create_gl3_context (GdkDisplay *display,
GLXFBConfig config,
GdkGLContext *share,
int profile,
int flags,
int major,
int minor)
{
int attrib_list[] = {
GLX_CONTEXT_PROFILE_MASK_ARB, profile,
GLX_CONTEXT_MAJOR_VERSION_ARB, major,
GLX_CONTEXT_MINOR_VERSION_ARB, minor,
GLX_CONTEXT_FLAGS_ARB, flags,
None,
};
GLXContext res;
GdkX11GLContext *share_x11 = NULL;
if (share != NULL)
share_x11 = GDK_X11_GL_CONTEXT (share);
gdk_x11_display_error_trap_push (display);
res = glXCreateContextAttribsARB (gdk_x11_display_get_xdisplay (display),
config,
share_x11 != NULL ? share_x11->glx_context : NULL,
True,
attrib_list);
if (gdk_x11_display_error_trap_pop (display))
return NULL;
return res;
}
static GLXContext
create_legacy_context (GdkDisplay *display,
GLXFBConfig config,
GdkGLContext *share)
{
GdkX11GLContext *share_x11 = NULL;
GLXContext res;
if (share != NULL)
share_x11 = GDK_X11_GL_CONTEXT (share);
gdk_x11_display_error_trap_push (display);
res = glXCreateNewContext (gdk_x11_display_get_xdisplay (display),
config,
GLX_RGBA_TYPE,
share_x11 != NULL ? share_x11->glx_context : NULL,
TRUE);
if (gdk_x11_display_error_trap_pop (display))
return NULL;
return res;
}
#ifdef HAVE_XDAMAGE
static void
finish_frame (GdkGLContext *context)
{
GdkX11GLContext *context_x11 = GDK_X11_GL_CONTEXT (context);
GdkSurface *surface = gdk_gl_context_get_surface (context);
if (context_x11->xdamage == 0)
return;
if (context_x11->frame_fence == 0)
return;
glDeleteSync (context_x11->frame_fence);
context_x11->frame_fence = 0;
_gdk_x11_surface_set_frame_still_painting (surface, FALSE);
}
static void
bind_context_for_frame_fence (GdkGLContext *context)
{
GdkGLContext *current_context;
GdkX11GLContext *current_context_x11;
GLXContext current_glx_context = NULL;
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_x11 = GDK_X11_GL_CONTEXT (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_x11->glx_context != current_glx_context)
goto out;
needs_binding = FALSE;
out:
if (needs_binding)
gdk_gl_context_make_current (context);
}
static gboolean
on_gl_surface_xevent (GdkGLContext *context,
XEvent *xevent,
GdkX11Display *display_x11)
{
GdkX11GLContext *context_x11 = GDK_X11_GL_CONTEXT (context);
XDamageNotifyEvent *damage_xevent;
if (!context_x11->is_attached)
return FALSE;
if (xevent->type != (display_x11->damage_event_base + XDamageNotify))
return FALSE;
damage_xevent = (XDamageNotifyEvent *) xevent;
if (damage_xevent->damage != context_x11->xdamage)
return FALSE;
if (context_x11->frame_fence)
{
GLenum wait_result;
bind_context_for_frame_fence (context);
wait_result = glClientWaitSync (context_x11->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 necessarly
* 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
static gboolean
gdk_x11_gl_context_realize (GdkGLContext *context,
GError **error)
{
GdkX11Display *display_x11;
GdkDisplay *display;
GdkX11GLContext *context_x11;
XVisualInfo *xvisinfo;
Display *dpy;
DrawableInfo *info;
GdkGLContext *share;
GdkGLContext *shared_data_context;
GdkSurface *surface;
gboolean debug_bit, compat_bit, legacy_bit, es_bit;
int major, minor, flags;
surface = gdk_gl_context_get_surface (context);
display = gdk_surface_get_display (surface);
dpy = gdk_x11_display_get_xdisplay (display);
context_x11 = GDK_X11_GL_CONTEXT (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);
compat_bit = gdk_gl_context_get_forward_compatible (context);
/* If there is no glXCreateContextAttribsARB() then we default to legacy */
legacy_bit = !display_x11->has_glx_create_context || GDK_DISPLAY_DEBUG_CHECK (display, GL_LEGACY);
es_bit = (GDK_DISPLAY_DEBUG_CHECK (display, GL_GLES) || (share != NULL && gdk_gl_context_get_use_es (share))) &&
(display_x11->has_glx_create_context && display_x11->has_glx_create_es2_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_bit = TRUE;
flags = 0;
if (debug_bit)
flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
if (compat_bit)
flags |= GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("Creating GLX context (version:%d.%d, debug:%s, forward:%s, legacy:%s, es:%s)",
major, minor,
debug_bit ? "yes" : "no",
compat_bit ? "yes" : "no",
legacy_bit ? "yes" : "no",
es_bit ? "yes" : "no"));
/* If we have access to GLX_ARB_create_context_profile then we can ask for
* a compatibility profile; if we don't, then we have to fall back to the
* old GLX 1.3 API.
*/
if (legacy_bit && !GDK_X11_DISPLAY (display)->has_glx_create_context)
{
GDK_DISPLAY_NOTE (display, OPENGL, g_message ("Creating legacy GL context on request"));
context_x11->glx_context = create_legacy_context (display, context_x11->glx_config, share ? share : shared_data_context);
}
else
{
int profile;
if (es_bit)
profile = GLX_CONTEXT_ES2_PROFILE_BIT_EXT;
else
profile = legacy_bit ? GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB
: GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
/* We need to tweak the version, otherwise we may end up requesting
* a compatibility context with a minimum version of 3.2, which is
* an error
*/
if (legacy_bit)
{
major = 3;
minor = 0;
}
GDK_DISPLAY_NOTE (display, OPENGL, g_message ("Creating GL3 context"));
context_x11->glx_context = create_gl3_context (display,
context_x11->glx_config,
share ? share : shared_data_context,
profile, flags, major, minor);
/* Fall back to legacy in case the GL3 context creation failed */
if (context_x11->glx_context == NULL)
{
GDK_DISPLAY_NOTE (display, OPENGL, g_message ("Creating fallback legacy context"));
context_x11->glx_context = create_legacy_context (display, context_x11->glx_config, share ? share : shared_data_context);
legacy_bit = TRUE;
es_bit = FALSE;
}
}
if (context_x11->glx_context == NULL)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
return FALSE;
}
/* Ensure that any other context is created with a legacy bit set */
gdk_gl_context_set_is_legacy (context, legacy_bit);
/* Ensure that any other context is created with an ES bit set */
gdk_gl_context_set_use_es (context, es_bit);
xvisinfo = find_xvisinfo_for_fbconfig (display, context_x11->glx_config);
info = get_glx_drawable_info (surface);
if (info == NULL)
{
XSetWindowAttributes attrs;
unsigned long mask;
gdk_x11_display_error_trap_push (display);
info = g_slice_new0 (DrawableInfo);
info->display = display;
info->last_frame_counter = 0;
attrs.override_redirect = True;
attrs.colormap = XCreateColormap (dpy, DefaultRootWindow (dpy), xvisinfo->visual, AllocNone);
attrs.border_pixel = 0;
mask = CWOverrideRedirect | CWColormap | CWBorderPixel;
info->dummy_xwin = XCreateWindow (dpy, DefaultRootWindow (dpy),
-100, -100, 1, 1,
0,
xvisinfo->depth,
CopyFromParent,
xvisinfo->visual,
mask,
&attrs);
XMapWindow(dpy, info->dummy_xwin);
if (GDK_X11_DISPLAY (display)->glx_version >= 13)
{
info->glx_drawable = glXCreateWindow (dpy, context_x11->glx_config,
gdk_x11_surface_get_xid (surface),
NULL);
info->dummy_glx = glXCreateWindow (dpy, context_x11->glx_config, info->dummy_xwin, NULL);
}
if (gdk_x11_display_error_trap_pop (display))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("Unable to create a GL context"));
XFree (xvisinfo);
drawable_info_free (info);
glXDestroyContext (dpy, context_x11->glx_context);
context_x11->glx_context = NULL;
return FALSE;
}
set_glx_drawable_info (surface, info);
}
XFree (xvisinfo);
context_x11->attached_drawable = info->glx_drawable ? info->glx_drawable : gdk_x11_surface_get_xid (surface);
context_x11->unattached_drawable = info->dummy_glx ? info->dummy_glx : info->dummy_xwin;
#ifdef HAVE_XDAMAGE
if (display_x11->have_damage && display_x11->has_async_glx_swap_buffers)
{
gdk_x11_display_error_trap_push (display);
context_x11->xdamage = XDamageCreate (dpy,
gdk_x11_surface_get_xid (surface),
XDamageReportRawRectangles);
if (gdk_x11_display_error_trap_pop (display))
{
context_x11->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
context_x11->is_direct = glXIsDirect (dpy, context_x11->glx_context);
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("Realized GLX context[%p], %s",
context_x11->glx_context,
context_x11->is_direct ? "direct" : "indirect"));
return TRUE;
}
static void
gdk_x11_gl_context_dispose (GObject *gobject)
{
GdkX11GLContext *context_x11 = GDK_X11_GL_CONTEXT (gobject);
if (context_x11->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_x11->glx_context)
glXMakeContextCurrent (dpy, None, None, NULL);
GDK_DISPLAY_NOTE (display, OPENGL, g_message ("Destroying GLX context"));
glXDestroyContext (dpy, context_x11->glx_context);
context_x11->glx_context = NULL;
}
#ifdef HAVE_XDAMAGE
context_x11->xdamage = 0;
#endif
G_OBJECT_CLASS (gdk_x11_gl_context_parent_class)->dispose (gobject);
}
static void
gdk_x11_gl_context_class_init (GdkX11GLContextClass *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_realize;
context_class->get_damage = gdk_x11_gl_context_get_damage;
draw_context_class->end_frame = gdk_x11_gl_context_end_frame;
gobject_class->dispose = gdk_x11_gl_context_dispose;
}
static void
gdk_x11_gl_context_init (GdkX11GLContext *self)
{
self->do_frame_sync = TRUE;
}
gboolean
gdk_x11_screen_init_gl (GdkX11Screen *screen)
{
GdkDisplay *display = GDK_SCREEN_DISPLAY (screen);
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
Display *dpy;
int error_base, event_base;
int screen_num;
if (display_x11->have_glx)
return TRUE;
if (GDK_DISPLAY_DEBUG_CHECK (display, GL_DISABLE))
return FALSE;
dpy = gdk_x11_display_get_xdisplay (display);
if (!epoxy_has_glx (dpy))
return FALSE;
if (!glXQueryExtension (dpy, &error_base, &event_base))
return FALSE;
screen_num = screen->screen_num;
display_x11->have_glx = TRUE;
display_x11->glx_version = epoxy_glx_version (dpy, screen_num);
display_x11->glx_error_base = error_base;
display_x11->glx_event_base = event_base;
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_swap_interval =
epoxy_has_glx_extension (dpy, screen_num, "GLX_SGI_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)
{
/* 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.
*/
display_x11->has_async_glx_swap_buffers = TRUE;
}
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("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_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"
"\t* GLX_ARB_multisample: %s"
"\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_swap_interval ? "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;
}
#define MAX_GLX_ATTRS 30
static gboolean
find_fbconfig (GdkDisplay *display,
GLXFBConfig *fb_config_out,
GError **error)
{
static int attrs[MAX_GLX_ATTRS];
Display *dpy = gdk_x11_display_get_xdisplay (display);
GLXFBConfig *configs;
int n_configs, i;
gboolean retval = FALSE;
VisualID xvisual_id = XVisualIDFromVisual (gdk_x11_display_get_window_visual (GDK_X11_DISPLAY (display)));
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;
if (gdk_display_is_rgba (display))
{
attrs[i++] = GLX_ALPHA_SIZE;
attrs[i++] = 1;
}
else
{
attrs[i++] = GLX_ALPHA_SIZE;
attrs[i++] = GLX_DONT_CARE;
}
attrs[i++] = None;
g_assert (i < MAX_GLX_ATTRS);
configs = glXChooseFBConfig (dpy, DefaultScreen (dpy), attrs, &n_configs);
if (configs == NULL || n_configs == 0)
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given pixel format"));
return FALSE;
}
for (i = 0; i < n_configs; i++)
{
XVisualInfo *visinfo;
visinfo = glXGetVisualFromFBConfig (dpy, configs[i]);
if (visinfo == NULL)
continue;
if (visinfo->visualid != xvisual_id)
{
XFree (visinfo);
continue;
}
if (fb_config_out != NULL)
*fb_config_out = configs[i];
XFree (visinfo);
retval = TRUE;
goto out;
}
g_set_error (error, GDK_GL_ERROR,
GDK_GL_ERROR_UNSUPPORTED_FORMAT,
_("No available configurations for the given RGBA pixel format"));
out:
XFree (configs);
return retval;
}
struct glvisualinfo {
int supports_gl;
int double_buffer;
int stereo;
int alpha_size;
int depth_size;
int stencil_size;
int num_multisample;
int visual_caveat;
};
static gboolean
visual_compatible (const GdkX11Visual *a, const GdkX11Visual *b)
{
return a->type == b->type &&
a->depth == b->depth &&
a->red_mask == b->red_mask &&
a->green_mask == b->green_mask &&
a->blue_mask == b->blue_mask &&
a->colormap_size == b->colormap_size &&
a->bits_per_rgb == b->bits_per_rgb;
}
static gboolean
visual_is_rgba (const GdkX11Visual *visual)
{
return
visual->depth == 32 &&
visual->red_mask == 0xff0000 &&
visual->green_mask == 0x00ff00 &&
visual->blue_mask == 0x0000ff;
}
/* This picks a compatible (as in has the same X visual details) visual
that has "better" characteristics on the GL side */
static GdkX11Visual *
pick_better_visual_for_gl (GdkX11Screen *x11_screen,
struct glvisualinfo *gl_info,
GdkX11Visual *compatible)
{
GdkX11Visual *visual;
int i;
gboolean want_alpha = visual_is_rgba (compatible);
/* First look for "perfect match", i.e:
* supports gl
* double buffer
* alpha iff visual is an rgba visual
* no unnecessary stuff
*/
for (i = 0; i < x11_screen->nvisuals; i++)
{
visual = x11_screen->visuals[i];
if (visual_compatible (visual, compatible) &&
gl_info[i].supports_gl &&
gl_info[i].double_buffer &&
!gl_info[i].stereo &&
(want_alpha ? (gl_info[i].alpha_size > 0) : (gl_info[i].alpha_size == 0)) &&
(gl_info[i].depth_size == 0) &&
(gl_info[i].stencil_size == 0) &&
(gl_info[i].num_multisample == 0) &&
(gl_info[i].visual_caveat == GLX_NONE_EXT))
return visual;
}
if (!want_alpha)
{
/* Next, allow alpha even if we don't want it: */
for (i = 0; i < x11_screen->nvisuals; i++)
{
visual = x11_screen->visuals[i];
if (visual_compatible (visual, compatible) &&
gl_info[i].supports_gl &&
gl_info[i].double_buffer &&
!gl_info[i].stereo &&
(gl_info[i].depth_size == 0) &&
(gl_info[i].stencil_size == 0) &&
(gl_info[i].num_multisample == 0) &&
(gl_info[i].visual_caveat == GLX_NONE_EXT))
return visual;
}
}
/* Next, allow depth and stencil buffers: */
for (i = 0; i < x11_screen->nvisuals; i++)
{
visual = x11_screen->visuals[i];
if (visual_compatible (visual, compatible) &&
gl_info[i].supports_gl &&
gl_info[i].double_buffer &&
!gl_info[i].stereo &&
(gl_info[i].num_multisample == 0) &&
(gl_info[i].visual_caveat == GLX_NONE_EXT))
return visual;
}
/* Next, allow multisample: */
for (i = 0; i < x11_screen->nvisuals; i++)
{
visual = x11_screen->visuals[i];
if (visual_compatible (visual, compatible) &&
gl_info[i].supports_gl &&
gl_info[i].double_buffer &&
!gl_info[i].stereo &&
(gl_info[i].visual_caveat == GLX_NONE_EXT))
return visual;
}
return compatible;
}
static gboolean
get_cached_gl_visuals (GdkDisplay *display, int *system, int *rgba)
{
gboolean found;
Atom type_return;
int format_return;
gulong nitems_return;
gulong bytes_after_return;
guchar *data = NULL;
Display *dpy;
dpy = gdk_x11_display_get_xdisplay (display);
found = FALSE;
gdk_x11_display_error_trap_push (display);
if (XGetWindowProperty (dpy, DefaultRootWindow (dpy),
gdk_x11_get_xatom_by_name_for_display (display, "GDK_VISUALS"),
0, 2, False, XA_INTEGER, &type_return,
&format_return, &nitems_return,
&bytes_after_return, &data) == Success)
{
if (type_return == XA_INTEGER &&
format_return == 32 &&
nitems_return == 2 &&
data != NULL)
{
long *visuals = (long *) data;
*system = (int)visuals[0];
*rgba = (int)visuals[1];
found = TRUE;
}
}
gdk_x11_display_error_trap_pop_ignored (display);
if (data)
XFree (data);
return found;
}
static void
save_cached_gl_visuals (GdkDisplay *display, int system, int rgba)
{
long visualdata[2];
Display *dpy;
dpy = gdk_x11_display_get_xdisplay (display);
visualdata[0] = system;
visualdata[1] = rgba;
gdk_x11_display_error_trap_push (display);
XChangeProperty (dpy, DefaultRootWindow (dpy),
gdk_x11_get_xatom_by_name_for_display (display, "GDK_VISUALS"),
XA_INTEGER, 32, PropModeReplace,
(unsigned char *)visualdata, 2);
gdk_x11_display_error_trap_pop_ignored (display);
}
void
_gdk_x11_screen_update_visuals_for_gl (GdkX11Screen *x11_screen)
{
GdkDisplay *display;
GdkX11Display *display_x11;
Display *dpy;
struct glvisualinfo *gl_info;
int i;
int system_visual_id, rgba_visual_id;
display = x11_screen->display;
display_x11 = GDK_X11_DISPLAY (display);
dpy = gdk_x11_display_get_xdisplay (display);
/* We save the default visuals as a property on the root window to avoid
having to initialize GL each time, as it may not be used later. */
if (get_cached_gl_visuals (display, &system_visual_id, &rgba_visual_id))
{
for (i = 0; i < x11_screen->nvisuals; i++)
{
GdkX11Visual *visual = x11_screen->visuals[i];
int visual_id = gdk_x11_visual_get_xvisual (visual)->visualid;
if (visual_id == system_visual_id)
x11_screen->system_visual = visual;
if (visual_id == rgba_visual_id)
x11_screen->rgba_visual = visual;
}
return;
}
if (!gdk_x11_screen_init_gl (x11_screen))
return;
gl_info = g_new0 (struct glvisualinfo, x11_screen->nvisuals);
for (i = 0; i < x11_screen->nvisuals; i++)
{
XVisualInfo *visual_list;
XVisualInfo visual_template;
int nxvisuals;
visual_template.screen = x11_screen->screen_num;
visual_template.visualid = gdk_x11_visual_get_xvisual (x11_screen->visuals[i])->visualid;
visual_list = XGetVisualInfo (x11_screen->xdisplay, VisualIDMask| VisualScreenMask, &visual_template, &nxvisuals);
if (visual_list == NULL)
continue;
glXGetConfig (dpy, &visual_list[0], GLX_USE_GL, &gl_info[i].supports_gl);
glXGetConfig (dpy, &visual_list[0], GLX_DOUBLEBUFFER, &gl_info[i].double_buffer);
glXGetConfig (dpy, &visual_list[0], GLX_STEREO, &gl_info[i].stereo);
glXGetConfig (dpy, &visual_list[0], GLX_ALPHA_SIZE, &gl_info[i].alpha_size);
glXGetConfig (dpy, &visual_list[0], GLX_DEPTH_SIZE, &gl_info[i].depth_size);
glXGetConfig (dpy, &visual_list[0], GLX_STENCIL_SIZE, &gl_info[i].stencil_size);
if (display_x11->has_glx_multisample)
glXGetConfig(dpy, &visual_list[0], GLX_SAMPLE_BUFFERS_ARB, &gl_info[i].num_multisample);
if (display_x11->has_glx_visual_rating)
glXGetConfig(dpy, &visual_list[0], GLX_VISUAL_CAVEAT_EXT, &gl_info[i].visual_caveat);
else
gl_info[i].visual_caveat = GLX_NONE_EXT;
XFree (visual_list);
}
x11_screen->system_visual = pick_better_visual_for_gl (x11_screen, gl_info, x11_screen->system_visual);
if (x11_screen->rgba_visual)
x11_screen->rgba_visual = pick_better_visual_for_gl (x11_screen, gl_info, x11_screen->rgba_visual);
g_free (gl_info);
save_cached_gl_visuals (display,
gdk_x11_visual_get_xvisual (x11_screen->system_visual)->visualid,
x11_screen->rgba_visual ? gdk_x11_visual_get_xvisual (x11_screen->rgba_visual)->visualid : 0);
}
GdkGLContext *
gdk_x11_surface_create_gl_context (GdkSurface *surface,
gboolean attached,
GdkGLContext *share,
GError **error)
{
GdkDisplay *display;
GdkX11GLContext *context;
GLXFBConfig config;
display = gdk_surface_get_display (surface);
if (!gdk_x11_screen_init_gl (GDK_SURFACE_SCREEN (surface)))
{
g_set_error_literal (error, GDK_GL_ERROR,
GDK_GL_ERROR_NOT_AVAILABLE,
_("No GL implementation is available"));
return NULL;
}
if (!find_fbconfig (display, &config, error))
return NULL;
context = g_object_new (GDK_TYPE_X11_GL_CONTEXT,
"surface", surface,
"shared-context", share,
NULL);
context->glx_config = config;
context->is_attached = attached;
return GDK_GL_CONTEXT (context);
}
gboolean
gdk_x11_display_make_gl_context_current (GdkDisplay *display,
GdkGLContext *context)
{
GdkX11GLContext *context_x11;
Display *dpy = gdk_x11_display_get_xdisplay (display);
gboolean do_frame_sync = FALSE;
GLXWindow drawable;
if (context == NULL)
{
glXMakeContextCurrent (dpy, None, None, NULL);
return TRUE;
}
context_x11 = GDK_X11_GL_CONTEXT (context);
if (context_x11->glx_context == NULL)
{
g_critical ("No GLX context associated to the GdkGLContext; you must "
"call gdk_gl_context_realize() first.");
return FALSE;
}
if (context_x11->is_attached || gdk_draw_context_is_in_frame (GDK_DRAW_CONTEXT (context)))
drawable = context_x11->attached_drawable;
else
drawable = context_x11->unattached_drawable;
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("Making GLX context %p current to drawable %lu",
context, (unsigned long) drawable));
if (!glXMakeContextCurrent (dpy, drawable, drawable,
context_x11->glx_context))
{
GDK_DISPLAY_NOTE (display, OPENGL,
g_message ("Making GLX context current failed"));
return FALSE;
}
if (context_x11->is_attached && GDK_X11_DISPLAY (display)->has_glx_swap_interval)
{
/* 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)
glXSwapIntervalSGI (1);
else
glXSwapIntervalSGI (0);
}
}
return TRUE;
}
/**
* 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;
if (!gdk_x11_screen_init_gl (GDK_X11_DISPLAY (display)->screen))
return FALSE;
if (major != NULL)
*major = GDK_X11_DISPLAY (display)->glx_version / 10;
if (minor != NULL)
*minor = GDK_X11_DISPLAY (display)->glx_version % 10;
return TRUE;
}
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