After creating surface context in _glfwPlatformCreateWindow function
proceeds with reading context parameters in _glfwRefreshContextAttribs,
which ends with clearing the front buffer when double buffering is
enabled.
Such buffer clearing implicitly calls swapBuffer, which may not behave
properly with the default swap interval. And user has no control to
override this swap interval value with the glfwSwapInterval, because
latter may only be called after the glfwCreateWindow, when it is too
late.
Either clearing buffer should be disablable, or user should have
control on the initial swap interval value before implicit swapBuffer
is invoked.
This patch implements latter by introducing GLFW_SWAP_INTERVAL window
hint. Default value is -1, which matches current policy of avoiding
to override swap interval.
A GLFW_CURSOR_UNAVAILABLE error would be emitted each time the cursor
moved over the fallback decorations if the standard cursor shape
appropriate for that part was missing on the system.
These errors served no useful purpose and have been removed.
This replaces the previous scheme where scancodes were equal to keycodes
(an implausible and potentially misleading situation) with a set of
scancodes invented purely for the null platform.
This is partly based on the implementation of libdecor support in
PR #1693 by @ christianrauch.
Where available, the libdecor library is loaded at init and becomes the
preferred method for window decorations. On compositors that support
XDG decorations, libdecor in turn uses those. If not, libdecor has
a plug-in archtecture and may load additional libraries to either use
compositor-specific decorations or draw its own.
If necessary, support for libdecor can be disabled with the
GLFW_WAYLAND_LIBDECOR init hint. This is mostly in case some part of
the dynamic loading or duplication of header material added here turns
out to cause problems with future versions of libdecor-0.so.0.
Fixes#1639Closes#1693
Related to #1725
This commit simplifies the detection of which element of a fallback
decorated window the pointer has entered. Instead of looping through
the list of windows, the user pointer of fallback decoration surfaces is
set to the GLFW window object.
This replaces (one case of) manual management of weak links between
windows and monitors, both objects with complex life times, with
wl_object pointers used as opaque key values.
This is in preparation for adding support for libdecor, which creates
its own proxies on our display. It will likely also be helpful to some
people using native access on Wayland.
This is partly based on the implementation of libdecor support in
PR #1693 by @ christianrauch.
If a window was initially fullscreen then it would not get an XDG
decoration object. If the window was later switched to windowed mode it
would then get fallback decorations instead of XDG ones.
Fixes the following CI warning:
"Node.js 12 actions are deprecated. Please update the following
actions to use Node.js 16: actions/checkout@v2..."
Closes#2255
Because EGL ties client API support to configs, attempts to create
a context with an unavailable client API will fail with the unhelpful
"failed to find suitable config" error description.
This attempts to detect cases where there are usable configs for the
other client API and emit a hopefully more helpful error.
Related to #2173
We only care about displayable pixel formats (as defined in
WGL_ARB_pixel_format) for window context creation.
This changes pixel format enumeration to ignore non-displayable formats,
which are specified to be listed after displayable ones, by always using
the return value of DescribePixelFormat as the pixel format count.
On systems lacking the EGL_EXT_present_opaque extension, some
compositors treat any buffer with an alpha channel as per-pixel
transparent.
This commit ignores any EGLConfig with an alpha channel if the extension
is missing and the window is created with GLFW_TRANSPARENT_FRAMEBUFFER
set to false.
This is technically not a breaking change since GLFW_ALPHA_BITS is not
a hard constraint, but it is still going to inconvenience anyone using
the framebuffer alpa channel to store other kinds of data.
Related to #1895
This adds window hints for the initial position, in screen coordinates,
of a window. The special value GLFW_ANY_POSITION means the window
manager will be allowed to position the window.
It is not possible to set window positions on Wayland and GLFW will
always behave as if these hints are set to GLFW_ANY_POSITION.
Fixes#1603Fixes#1747
