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GtkGLArea and libmpv need compatible rendering paths. Selecting GLES or
Vulkan can break composition on proprietary NVIDIA Wayland drivers.
Default GDK and GSK to desktop OpenGL before GTK starts
diff --git a/src/main.rs b/src/main.rs
--- a/src/main.rs
+++ b/src/main.rs
@@ -33,6 +33,18 @@
}
fn main() -> ExitCode {
+ // GtkGLArea and libmpv must use desktop OpenGL. In particular, allowing
+ // GDK to choose GLES or GSK to choose Vulkan breaks composition on the
+ // proprietary NVIDIA Wayland driver. Keep both knobs user-overridable.
+ unsafe {
+ if env::var_os("GDK_DEBUG").is_none() {
+ env::set_var("GDK_DEBUG", "gl-prefer-gl");
+ }
+ if env::var_os("GSK_RENDERER").is_none() {
+ env::set_var("GSK_RENDERER", "gl");
+ }
+ }
+
tracing_subscriber::fmt::init();
let data_dir = dirs::data_dir()
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