Add `prefer_egl` debug option
Some systems have rendering issues when using GLX rather than EGL. While this is usually due to a driver bug, it is helpful to provide a workaround for this by allowing people to prefer EGL over GLX. This patch adds the new `debug.prefer_egl` option to provide this workaround. Closes #7056.
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@ -22,6 +22,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
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- Copy global IPC options (`-w -1`) for new windows
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- Bindings to create and navigate tabs on macOS
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- Support startup notify protocol to raise initial window on Wayland/X11
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- Debug option `prefer_egl` to prioritize EGL over other display APIs
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### Changed
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@ -23,6 +23,9 @@ pub struct Debug {
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/// The renderer alacritty should be using.
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pub renderer: Option<RendererPreference>,
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/// Use EGL as display API if the current platform allows it.
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pub prefer_egl: bool,
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/// Record ref test.
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#[config(skip)]
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pub ref_test: bool,
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@ -38,6 +41,7 @@ impl Default for Debug {
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highlight_damage: Default::default(),
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ref_test: Default::default(),
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renderer: Default::default(),
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prefer_egl: Default::default(),
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}
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}
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}
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@ -21,15 +21,24 @@ use winit::window::raw_window_handle::{RawDisplayHandle, RawWindowHandle};
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pub fn create_gl_display(
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raw_display_handle: RawDisplayHandle,
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_raw_window_handle: Option<RawWindowHandle>,
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_prefer_egl: bool,
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) -> GlutinResult<Display> {
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#[cfg(target_os = "macos")]
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let preference = DisplayApiPreference::Cgl;
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#[cfg(windows)]
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let preference = DisplayApiPreference::Wgl(Some(_raw_window_handle.unwrap()));
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let preference = if _prefer_egl {
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DisplayApiPreference::EglThenWgl(Some(_raw_window_handle.unwrap()))
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} else {
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DisplayApiPreference::WglThenEgl(Some(_raw_window_handle.unwrap()))
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};
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#[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
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let preference = DisplayApiPreference::GlxThenEgl(Box::new(x11::register_xlib_error_hook));
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let preference = if _prefer_egl {
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DisplayApiPreference::EglThenGlx(Box::new(x11::register_xlib_error_hook))
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} else {
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DisplayApiPreference::GlxThenEgl(Box::new(x11::register_xlib_error_hook))
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};
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#[cfg(all(not(feature = "x11"), not(any(target_os = "macos", windows))))]
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let preference = DisplayApiPreference::Egl;
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@ -92,8 +92,11 @@ impl WindowContext {
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#[cfg(not(windows))]
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let raw_window_handle = None;
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let gl_display =
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renderer::platform::create_gl_display(raw_display_handle, raw_window_handle)?;
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let gl_display = renderer::platform::create_gl_display(
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raw_display_handle,
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raw_window_handle,
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config.debug.prefer_egl,
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)?;
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let gl_config = renderer::platform::pick_gl_config(&gl_display, raw_window_handle)?;
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#[cfg(not(windows))]
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@ -935,6 +935,13 @@ relied upon.
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Default: _false_
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*prefer_egl* <boolean>
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Use EGL as display API if the current platform allows it. Note that
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transparency may not work with EGL on Linux/BSD.
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Default: _false_
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# SEE ALSO
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*alacritty*(1), *alacritty-msg*(1), *alacritty-bindings*(5)
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