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Wayland: Fix window opacity on older systems

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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 commit is contained in:
Camilla Löwy
2022-07-25 20:33:47 +02:00
parent c18851f52e
commit ef6c9d8b4f
4 changed files with 31 additions and 0 deletions
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docs/news.dox
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@@ -126,6 +126,19 @@ To work around this, call any joystick function before waiting for events, for
example by setting a [joystick callback](@ref joystick_event).
@subsubsection wayland_alpha_34 Frambuffer may lack alpha channel on older Wayland systems
On Wayland, when creating an EGL context on a machine lacking the new
`EGL_EXT_present_opaque` extension, the @ref GLFW_ALPHA_BITS window hint will be
ignored and the framebuffer will have no alpha channel. This is because some
Wayland compositors treat any buffer with an alpha channel as per-pixel
transparent.
If you want a per-pixel transparent window, see the
[GLFW_TRANSPARENT_FRAMEBUFFER](@ref GLFW_TRANSPARENT_FRAMEBUFFER_hint) window
hint.
@subsubsection standalone_34 Tests and examples are disabled when built as a subproject
GLFW now does not build the tests and examples when it is added as