Introduce Error::ContextCreationFailed

glutin/src/application.rs

@@ -80,12 +80,25 @@ where
             .or_else(|_| second_builder.build_windowed(builder, &event_loop))
             .map_err(|error| {
                 use glutin::CreationError;
+                use iced_graphics::Error as ContextError;
 
                 match error {
                     CreationError::Window(error) => {
                         Error::WindowCreationFailed(error)
                     }
-                    _ => Error::GraphicsAdapterNotFound,
+                    CreationError::OpenGlVersionNotSupported => {
+                        Error::ContextCreationFailed(
+                            ContextError::VersionNotSupported,
+                        )
+                    }
+                    CreationError::NoAvailablePixelFormat => {
+                        Error::ContextCreationFailed(
+                            ContextError::NoAvailablePixelFormat,
+                        )
+                    }
+                    error => Error::ContextCreationFailed(
+                        ContextError::BackendError(error.to_string()),
+                    ),
                 }
             })?;
 

graphics/src/error.rs

@@ -1,7 +1,19 @@
-/// A graphical error that occurred while running an application.
+/// An error that occurred while creating an application's graphical context.
 #[derive(Debug, thiserror::Error)]
 pub enum Error {
-    /// A suitable graphics adapter or device could not be found
+    /// The requested backend version is not supported.
+    #[error("the requested backend version is not supported")]
+    VersionNotSupported,
+
+    /// Failed to find any pixel format that matches the criteria.
+    #[error("failed to find any pixel format that matches the criteria")]
+    NoAvailablePixelFormat,
+
+    /// A suitable graphics adapter or device could not be found.
     #[error("a suitable graphics adapter or device could not be found")]
-    AdapterNotFound,
+    GraphicsAdapterNotFound,
+
+    /// An error occured in the context's internal backend
+    #[error("an error occured in the context's internal backend")]
+    BackendError(String),
 }

src/error.rs

@@ -11,9 +11,9 @@ pub enum Error {
     #[error("the application window could not be created")]
     WindowCreationFailed(Box<dyn std::error::Error + Send + Sync>),
 
-    /// A suitable graphics adapter or device could not be found.
-    #[error("a suitable graphics adapter or device could not be found")]
-    GraphicsAdapterNotFound,
+    /// The application context could not be created.
+    #[error("the application context could not be created")]
+    ContextCreationFailed(iced_graphics::Error),
 }
 
 impl From<iced_winit::Error> for Error {
@@ -25,8 +25,8 @@ impl From<iced_winit::Error> for Error {
             iced_winit::Error::WindowCreationFailed(error) => {
                 Error::WindowCreationFailed(Box::new(error))
             }
-            iced_winit::Error::GraphicsAdapterNotFound => {
-                Error::GraphicsAdapterNotFound
+            iced_winit::Error::ContextCreationFailed(error) => {
+                Error::ContextCreationFailed(error)
             }
         }
     }

wgpu/src/window/compositor.rs

@@ -105,7 +105,7 @@ impl iced_graphics::window::Compositor for Compositor {
             settings,
             compatible_window,
         ))
-        .ok_or(Error::AdapterNotFound)?;
+        .ok_or(Error::GraphicsAdapterNotFound)?;
 
         let backend = compositor.create_backend();
 

winit/src/error.rs

@@ -11,17 +11,13 @@ pub enum Error {
     #[error("the application window could not be created")]
     WindowCreationFailed(winit::error::OsError),
 
-    /// A suitable graphics adapter or device could not be found.
-    #[error("a suitable graphics adapter or device could not be found")]
-    GraphicsAdapterNotFound,
+    /// The application context could not be created.
+    #[error("the application context could not be created")]
+    ContextCreationFailed(iced_graphics::Error),
 }
 
 impl From<iced_graphics::Error> for Error {
     fn from(error: iced_graphics::Error) -> Error {
-        match error {
-            iced_graphics::Error::AdapterNotFound => {
-                Error::GraphicsAdapterNotFound
-            }
-        }
+        Error::ContextCreationFailed(error)
     }
 }