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glfw/docs/news.dox
Camilla Löwy cd22e28495 X11: Fix empty event race condition with a pipe 
There is a seemingly unavoidable race condition when waiting for data on
the X11 display connection, as long as any other thread is also making
Xlib calls.  The event data we are waiting for could be read by the
other thread as part of looking for the reply to its request, before our
poll has begun.

This commit replaces the X11 event sent by glfwPostEmptyEvent with
writing to an unnamed pipe.  The race condition remains if other Xlib
calls are made on other threads, but glfwPostEmptyEvent should now be
race-free.

This commit is based on work by pcwalton, OlivierSohn, kovidgoyal and
joaodasilva.

Closes #2033
Related to #379
Related to #1281
Related to #1285
2022-03-03 22:16:59 +01:00

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/*!
@page news Release notes
@tableofcontents
@section news_34 Release notes for version 3.4
@subsection features_34 New features in version 3.4
@subsubsection runtime_platform_34 Runtime platform selection
GLFW now supports being compiled for multiple backends and selecting between
them at runtime with the @ref GLFW_PLATFORM init hint. After initialization the
selected platform can be queried with @ref glfwGetPlatform. You can check if
support for a given platform is compiled in with @ref glfwPlatformSupported.
@subsubsection standard_cursors_34 More standard cursors
GLFW now provides the standard cursor shapes @ref GLFW_RESIZE_NWSE_CURSOR and
@ref GLFW_RESIZE_NESW_CURSOR for diagonal resizing, @ref GLFW_RESIZE_ALL_CURSOR
for omni-directional resizing and @ref GLFW_NOT_ALLOWED_CURSOR for showing an
action is not allowed.
Unlike the original set, these shapes may not be available everywhere and
creation will then fail with the new @ref GLFW_CURSOR_UNAVAILABLE error.
The cursors for horizontal and vertical resizing are now referred to as @ref
GLFW_RESIZE_EW_CURSOR and @ref GLFW_RESIZE_NS_CURSOR, and the pointing hand
cursor is now referred to as @ref GLFW_POINTING_HAND_CURSOR. The older names
are still available.
For more information see @ref cursor_standard.
@subsubsection mouse_passthrough_34 Mouse event passthrough
GLFW now provides the [GLFW_MOUSE_PASSTHROUGH](@ref GLFW_MOUSE_PASSTHROUGH_hint)
window hint for making a window transparent to mouse input, lettings events pass
to whatever window is behind it. This can also be changed after window
creation with the matching [window attribute](@ref GLFW_MOUSE_PASSTHROUGH_attrib).
@subsubsection features_34_angle_backend Support for ANGLE rendering backend selection
GLFW now provides the
[GLFW_ANGLE_PLATFORM_TYPE](@ref GLFW_ANGLE_PLATFORM_TYPE_hint) init hint for
requesting a specific rendering backend when using
[ANGLE](https://chromium.googlesource.com/angle/angle/) to create OpenGL ES
contexts.
@subsubsection features_34_init_allocator Support for custom memory allocator
GLFW now supports plugging a custom memory allocator at initialization with @ref
glfwInitAllocator. The allocator is a struct of type @ref GLFWallocator with
function pointers corresponding to the standard library functions `malloc`,
`realloc` and `free`.
For more information see @ref init_allocator.
@subsubsection features_34_win32_keymenu Support for keyboard access to Windows window menu
GLFW now provides the
[GLFW_WIN32_KEYBOARD_MENU](@ref GLFW_WIN32_KEYBOARD_MENU_hint) window hint for
enabling keyboard access to the window menu via the Alt+Space and
Alt-and-then-Space shortcuts. This may be useful for more GUI-oriented
applications.
@subsection caveats Caveats for version 3.4
@subsubsection native_34 Multiple sets of native access functions
Because GLFW now supports runtime selection of platform (window system), a library binary
may export native access functions for multiple platforms. Starting with version 3.4 you
must not assume that GLFW is running on a platform just because it exports native access
functions for it. After initialization you can query the selected platform with @ref
glfwGetPlatform.
@subsubsection version_string_34 Version string format has been changed
Because GLFW now supports runtime selection of platform (window system), the version
string returned by @ref glfwGetVersionString has been expanded. It now contains the names
of all APIs for all the platforms that the library binary supports.
@subsubsection joysticks_34 Joystick support is initialized on demand
The joystick part of GLFW is now initialized when first used, primarily to work
around faulty Windows drivers that cause DirectInput to take up to several
seconds to enumerate devices.
This change will usually not be observable. However, if your application waits
for events without having first called any joystick function or created any
visible windows, the wait may never unblock as GLFW may not yet have subscribed
to joystick related OS events.
To work around this, call any joystick function before waiting for events, for
example by setting a [joystick callback](@ref joystick_event).
@subsubsection standalone_34 Tests and examples are disabled when built as a sub-project
GLFW now does not build the tests and examples when it is added as
a subdirectory of another CMake project. To enable these, set the @ref
GLFW_BUILD_TESTS and @ref GLFW_BUILD_EXAMPLES cache variables before adding the
GLFW subdirectory.
@code{.cmake}
set(GLFW_BUILD_EXAMPLES ON CACHE BOOL "" FORCE)
set(GLFW_BUILD_TESTS ON CACHE BOOL "" FORCE)
add_subdirectory(path/to/glfw)
@endcode
@subsubsection initmenu_34 macOS main menu now created at initialization
GLFW now creates the main menu and completes the initialization of NSApplication
during initialization. Programs that do not want a main menu can disable it
with the [GLFW_COCOA_MENUBAR](@ref GLFW_COCOA_MENUBAR_hint) init hint.
@subsubsection corevideo_34 CoreVideo dependency has been removed
GLFW no longer depends on the CoreVideo framework on macOS and it no longer
needs to be specified during compilation or linking.
@subsubsection caveat_fbtransparency_34 Framebuffer transparency requires DWM transparency
GLFW no longer supports framebuffer transparency enabled via @ref
GLFW_TRANSPARENT_FRAMEBUFFER on Windows 7 if DWM transparency is off
(the Transparency setting under Personalization > Window Color).
@subsubsection emptyevents_34 Empty events on X11 no longer roundtrip to server
Events posted with @ref glfwPostEmptyEvent now use a separate unnamed pipe
instead of sending an X11 client event to the helper window.
@subsection deprecations_34 Deprecations in version 3.4
@subsection removals_34 Removals in 3.4
@subsubsection vulkan_static_34 GLFW_VULKAN_STATIC CMake option has been removed
This option was used to compile GLFW directly linked with the Vulkan loader, instead of
using dynamic loading to get hold of `vkGetInstanceProcAddr` at initialization. This is
now done by calling the @ref glfwInitVulkanLoader function before initialization.
If you need backward compatibility, this macro can still be defined for GLFW 3.4 and will
have no effect. The call to @ref glfwInitVulkanLoader can be conditionally enabled in
your code by checking the @ref GLFW_VERSION_MAJOR and @ref GLFW_VERSION_MINOR macros.
@subsubsection osmesa_option_34 GLFW_USE_OSMESA CMake option has been removed
This option was used to compile GLFW for the Null platform. The Null platform is now
always supported. To produce a library binary that only supports this platform, the way
this CMake option used to do, you will instead need to disable the default platform for
the target OS. This means setting the @ref GLFW_BUILD_WIN32, @ref GLFW_BUILD_COCOA or
@ref GLFW_BUILD_X11 CMake option to false.
You can set all of them to false and the ones that don't apply for the target OS will be
ignored.
@subsubsection wl_shell_34 Support for the wl_shell protocol has been removed
Support for the wl_shell protocol has been removed and GLFW now only supports
the XDG-Shell protocol. If your Wayland compositor does not support XDG-Shell
then GLFW will fail to initialize.
@subsection symbols_34 New symbols in version 3.4
@subsubsection functions_34 New functions in version 3.4
- @ref glfwInitAllocator
- @ref glfwGetPlatform
- @ref glfwPlatformSupported
- @ref glfwInitVulkanLoader
@subsubsection types_34 New types in version 3.4
- @ref GLFWallocator
- @ref GLFWallocatefun
- @ref GLFWreallocatefun
- @ref GLFWdeallocatefun
@subsubsection constants_34 New constants in version 3.4
- @ref GLFW_PLATFORM
- @ref GLFW_ANY_PLATFORM
- @ref GLFW_PLATFORM_WIN32
- @ref GLFW_PLATFORM_COCOA
- @ref GLFW_PLATFORM_WAYLAND
- @ref GLFW_PLATFORM_X11
- @ref GLFW_PLATFORM_NULL
- @ref GLFW_PLATFORM_UNAVAILABLE
- @ref GLFW_POINTING_HAND_CURSOR
- @ref GLFW_RESIZE_EW_CURSOR
- @ref GLFW_RESIZE_NS_CURSOR
- @ref GLFW_RESIZE_NWSE_CURSOR
- @ref GLFW_RESIZE_NESW_CURSOR
- @ref GLFW_RESIZE_ALL_CURSOR
- @ref GLFW_MOUSE_PASSTHROUGH
- @ref GLFW_NOT_ALLOWED_CURSOR
- @ref GLFW_CURSOR_UNAVAILABLE
- @ref GLFW_WIN32_KEYBOARD_MENU
- @ref GLFW_CONTEXT_DEBUG
- @ref GLFW_FEATURE_UNAVAILABLE
- @ref GLFW_FEATURE_UNIMPLEMENTED
- @ref GLFW_ANGLE_PLATFORM_TYPE
- @ref GLFW_ANGLE_PLATFORM_TYPE_NONE
- @ref GLFW_ANGLE_PLATFORM_TYPE_OPENGL
- @ref GLFW_ANGLE_PLATFORM_TYPE_OPENGLES
- @ref GLFW_ANGLE_PLATFORM_TYPE_D3D9
- @ref GLFW_ANGLE_PLATFORM_TYPE_D3D11
- @ref GLFW_ANGLE_PLATFORM_TYPE_VULKAN
- @ref GLFW_ANGLE_PLATFORM_TYPE_METAL
- @ref GLFW_X11_XCB_VULKAN_SURFACE
@section news_archive Release notes for earlier versions
- [Release notes for 3.3](https://www.glfw.org/docs/3.3/news.html)
- [Release notes for 3.2](https://www.glfw.org/docs/3.2/news.html)
- [Release notes for 3.1](https://www.glfw.org/docs/3.1/news.html)
- [Release notes for 3.0](https://www.glfw.org/docs/3.0/news.html)
*/
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