/* 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 #include "gdkprofilerprivate.h" #include #include #include 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 (¤t_count); glXWaitVideoSyncSGI (2, (current_count + 1) % 2, ¤t_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_swap_interval) { 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_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 && 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 != 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); 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_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; int context_attribs[N_GLX_ATTRS], i = 0, flags = 0; int min_major, min_minor, major, minor; gboolean debug_bit, compat_bit; 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 (api, legacy, 0, &min_major, &min_minor); gdk_gl_context_get_clipped_version (context, min_major, min_minor, &major, &minor); 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; context_attribs[i++] = major; context_attribs[i++] = GLX_CONTEXT_MINOR_VERSION_ARB; context_attribs[i++] = minor; 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)", major, minor, 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); gdk_x11_display_error_trap_push (display); /* 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 (gdk_x11_display_error_trap_pop (display) || ctx == NULL) 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_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; if (gdk_display_get_debug_flags (display) & GDK_DEBUG_GL_LEGACY) legacy = TRUE; /* 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; if (preferred_api == GDK_GL_API_GL) { if ((api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GL, legacy)) || (api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GLES, legacy)) || (api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GL, TRUE))) return api; } else { if ((api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GLES, FALSE)) || (api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GL, legacy)) || (api = gdk_x11_context_create_glx_context (context, GDK_GL_API_GL, TRUE))) return api; } g_set_error_literal (error, GDK_GL_ERROR, GDK_GL_ERROR_NOT_AVAILABLE, _("Unable to create a GL context")); return 0; } #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->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_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) { 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_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_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; }