[gtk+] (42 commits) Non-fast-forward update to branch wip/otte/vulkan

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/vulkan' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  758f54b... build: Add Vulkan detection code
  411f3f2... vulkan: Initial support
  4c4e4d2... gdk: Add more infrastructure
  100b0ba... gdk: Add GdkDrawContext
  216dfc0... gdk: Turn GdkGLContext into a GdkDrawContext
  f400ac7... vulkan: Turn GdkVulkanContext into a GdkDrawContext
  8b23fd9... vulkan: More work on GdkVulkanContext
  6075345... gsk: Change gsk_renderer_realize()
  14b7ed6... gsk: Add gsk_renderer_new_for_window()
  1e77f69... gskrenderer: Add GError argument to gsk_renderer_realize()
  046bdc4... cssgadget: Compute relative to own allocation, not widget a
  ceda1e2... listbox: Move the priv->gadget allocation
  b8810fd... flowbox: Size gadget realtive to widget->window
  f828b81... cairorenderer: Remove nonexisting function from header
  8eb23b0... gsk: Change GSK_USE_SOFTWARE env var to GSK_RENDERER
  11a6307... x11: Call gdk_display_sync() when creating Vulkan surfaces
  302b518... gdk: Add GDK_VULKAN env variable
  c3f0132... vulkan: Register debug handler
  4a3469f... gsk: Add skeleton for Vulkan renderer

Commits added to the branch:

  3efbb75... mir: fix build failures (*)
  316b24e... Fix reference handling in GtkScaleButton (*)
  0037d4d... Don't leak a pixbuf reference in dnd (*)
  ee1ae7f... gtk-demo: Add a demo for tabs (*)
  c8b92cb... demos: Remove undefined function call (*)
  bd45199... wayland: Check for subsurface looking up the toplevel (*)
  238334c... cairorenderer: Remove nonexisting function from header (*)
  e28d94b... listbox: Move the priv->gadget allocation (*)
  d12c81f... flowbox: Size gadget realtive to widget->window (*)
  bdcfc17... gdkwindow: Remove unused vfunc (*)
  efd04b4... gdk: Make GdkDrawingContext not per-backend (*)
  ce98df8... gsk: Change gsk_renderer_realize() (*)
  5563841... gsk: Add gsk_renderer_new_for_window() (*)
  318e19f... gskrenderer: Add GError argument to gsk_renderer_realize() (*)
  4d5df01... drawingcontext: Store the GL paint context
  00f8318... window: Change behavior of gdk_window_begin_draw_frame()
  e736061... API: Require passing a GLContext to begin_draw_frame()
  efa1549... gskrenderer: Store the GL context
  3b0cd88... gdk: Never draw with GL
  58c1cc0... gdk: Remove all code that only existed because of use_gl
  b16d529... gdk: Don't recurse when processing updates
  9e7434d... gsk: Allow 0 for gsk_gl_driver_begin_frame()
  5d68dc6... gdk: Large GL refactoring
  bb7f329... glcontext: Make begin/end_draw() paired
  03a26c5... gdk: Redo GL drawing
  6c5996c... build: Add Vulkan detection code
  2f49bbd... vulkan: Initial support
  aeb30cd... gdk: Add more infrastructure
  83b6208... gdk: Add GdkDrawContext
  ad60d20... gdk: Turn GdkGLContext into a GdkDrawContext
  067579d... vulkan: Turn GdkVulkanContext into a GdkDrawContext
  febe743... vulkan: More work on GdkVulkanContext
  72e1302... cssgadget: Compute relative to own allocation, not widget a
  9cf7c30... gsk: Change GSK_USE_SOFTWARE env var to GSK_RENDERER
  1dad48c... x11: Call gdk_display_sync() when creating Vulkan surfaces
  ba22f5a... gdk: Add GDK_VULKAN env variable
  22cef4d... vulkan: Register debug handler
  e60282e... gsk: Add skeleton for Vulkan renderer
  af59be8... vulkan: Expose the swapchain images in public API
  cb49cb7... gsk: Add a vulkan debug category
  a778363... gskvulkanrenderer: Create imagevies and framebuffers
  e8b5a94... gskvulkan: Create render pass and command pool

(*) This commit already existed in another branch; no separate mail sent