metal: handle gpu reset

Unfortunately this doesn't seem to work on amdgpu [1]. I've tested that
it works on i915.

[1] https://gitlab.freedesktop.org/drm/amd/-/issues/1749

src/render/renderer/context.rs

@@ -66,7 +66,19 @@ impl Debug for RenderContext {
     }
 }
 
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub enum ResetStatus {
+    Guilty,
+    Innocent,
+    Unknown,
+    Other(u32),
+}
+
 impl RenderContext {
+    pub fn reset_status(&self) -> Option<ResetStatus> {
+        self.ctx.reset_status()
+    }
+
     pub fn from_drm_device(drm: &Drm) -> Result<Self, RenderError> {
         let nodes = drm.get_nodes()?;
         let node = match nodes

src/render/renderer/renderer.rs

@@ -198,7 +198,7 @@ impl Renderer<'_> {
             std::slice::from_ref(&pos.at_point(x, y)),
             &Color::from_rgba_straight(20, 20, 20, 255),
         );
-        if let Some(tex) = placeholder.texture() {
+        if let Some(tex) = placeholder.texture.get() {
             let x = x + (pos.width() - tex.width()) / 2;
             let y = y + (pos.height() - tex.height()) / 2;
             self.render_texture(&tex, x, y, &ARGB8888);