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Wayland: Fix window opacity on older systems
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
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@ -185,6 +185,7 @@ video tutorials.
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- pthom
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- Martin Pulec
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- Guillaume Racicot
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- Christian Rauch
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- Philip Rideout
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- Eddie Ringle
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- Max Risuhin
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@ -315,6 +315,8 @@ information on what to include when reporting a bug.
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- [Wayland] Added support for key names via xkbcommon
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- [Wayland] Added support for file path drop events (#2040)
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- [Wayland] Added support for more human-readable monitor names where available
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- [Wayland] Disabled alpha channel for opaque windows on systems lacking
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`EGL_EXT_present_opaque` (#1895)
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- [Wayland] Removed support for `wl_shell` (#1443)
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- [Wayland] Bugfix: The `GLFW_HAND_CURSOR` shape used the wrong image (#1432)
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- [Wayland] Bugfix: `CLOCK_MONOTONIC` was not correctly enabled
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@ -126,6 +126,19 @@ To work around this, call any joystick function before waiting for events, for
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example by setting a [joystick callback](@ref joystick_event).
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@subsubsection wayland_alpha_34 Frambuffer may lack alpha channel on older Wayland systems
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On Wayland, when creating an EGL context on a machine lacking the new
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`EGL_EXT_present_opaque` extension, the @ref GLFW_ALPHA_BITS window hint will be
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ignored and the framebuffer will have no alpha channel. This is because some
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Wayland compositors treat any buffer with an alpha channel as per-pixel
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transparent.
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If you want a per-pixel transparent window, see the
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[GLFW_TRANSPARENT_FRAMEBUFFER](@ref GLFW_TRANSPARENT_FRAMEBUFFER_hint) window
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hint.
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@subsubsection standalone_34 Tests and examples are disabled when built as a subproject
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GLFW now does not build the tests and examples when it is added as
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@ -173,6 +173,21 @@ static GLFWbool chooseEGLConfig(const _GLFWctxconfig* ctxconfig,
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u->depthBits = getEGLConfigAttrib(n, EGL_DEPTH_SIZE);
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u->stencilBits = getEGLConfigAttrib(n, EGL_STENCIL_SIZE);
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#if defined(_GLFW_WAYLAND)
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if (_glfw.platform.platformID == GLFW_PLATFORM_WAYLAND)
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{
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// NOTE: The wl_surface opaque region is no guarantee that its buffer
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// is presented as opaque, if it also has an alpha channel
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// HACK: If EGL_EXT_present_opaque is unavailable, ignore any config
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// with an alpha channel to ensure the buffer is opaque
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if (!_glfw.egl.EXT_present_opaque)
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{
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if (!desired->transparent && u->alphaBits > 0)
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continue;
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}
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}
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#endif // _GLFW_WAYLAND
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u->samples = getEGLConfigAttrib(n, EGL_SAMPLES);
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u->doublebuffer = desired->doublebuffer;
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