Don't panic if WebGL thread can't be reached during finalization.

components/script/dom/webglbuffer.rs

@@ -91,21 +91,25 @@ impl WebGLBuffer {
         self.capacity.get()
     }
 
-    pub fn mark_for_deletion(&self) {
+    pub fn mark_for_deletion(&self, fallible: bool) {
         if self.marked_for_deletion.get() {
             return;
         }
         self.marked_for_deletion.set(true);
         if self.is_deleted() {
-            self.delete();
+            self.delete(fallible);
         }
     }
 
-    fn delete(&self) {
+    fn delete(&self, fallible: bool) {
         assert!(self.is_deleted());
-        self.upcast::<WebGLObject>()
-            .context()
-            .send_command(WebGLCommand::DeleteBuffer(self.id));
+        let context = self.upcast::<WebGLObject>().context();
+        let cmd = WebGLCommand::DeleteBuffer(self.id);
+        if fallible {
+            context.send_command_ignored(cmd);
+        } else {
+            context.send_command(cmd);
+        }
     }
 
     pub fn is_marked_for_deletion(&self) -> bool {
@@ -149,7 +153,7 @@ impl WebGLBuffer {
                 .expect("refcount underflowed"),
         );
         if self.is_deleted() {
-            self.delete();
+            self.delete(false);
         }
     }
 
@@ -160,6 +164,6 @@ impl WebGLBuffer {
 
 impl Drop for WebGLBuffer {
     fn drop(&mut self) {
-        self.mark_for_deletion();
+        self.mark_for_deletion(true);
     }
 }

components/script/dom/webglframebuffer.rs

@@ -140,12 +140,16 @@ impl WebGLFramebuffer {
             ));
     }
 
-    pub fn delete(&self) {
+    pub fn delete(&self, fallible: bool) {
         if !self.is_deleted.get() {
             self.is_deleted.set(true);
-            self.upcast::<WebGLObject>()
-                .context()
-                .send_command(WebGLCommand::DeleteFramebuffer(self.id));
+            let context = self.upcast::<WebGLObject>().context();
+            let cmd = WebGLCommand::DeleteFramebuffer(self.id);
+            if fallible {
+                context.send_command_ignored(cmd);
+            } else {
+                context.send_command(cmd);
+            }
         }
     }
 
@@ -588,7 +592,7 @@ impl WebGLFramebuffer {
 
 impl Drop for WebGLFramebuffer {
     fn drop(&mut self) {
-        self.delete();
+        self.delete(true);
     }
 }
 

components/script/dom/webglprogram.rs

@@ -77,14 +77,18 @@ impl WebGLProgram {
     }
 
     /// glDeleteProgram
-    pub fn mark_for_deletion(&self) {
+    pub fn mark_for_deletion(&self, fallible: bool) {
         if self.marked_for_deletion.get() {
             return;
         }
         self.marked_for_deletion.set(true);
-        self.upcast::<WebGLObject>()
-            .context()
-            .send_command(WebGLCommand::DeleteProgram(self.id));
+        let cmd = WebGLCommand::DeleteProgram(self.id);
+        let context = self.upcast::<WebGLObject>().context();
+        if fallible {
+            context.send_command_ignored(cmd);
+        } else {
+            context.send_command(cmd);
+        }
         if self.is_deleted() {
             self.detach_shaders();
         }
@@ -443,7 +447,7 @@ impl WebGLProgram {
 impl Drop for WebGLProgram {
     fn drop(&mut self) {
         self.in_use(false);
-        self.mark_for_deletion();
+        self.mark_for_deletion(true);
     }
 }
 

components/script/dom/webglrenderbuffer.rs

@@ -89,7 +89,7 @@ impl WebGLRenderbuffer {
             .send_command(WebGLCommand::BindRenderbuffer(target, Some(self.id)));
     }
 
-    pub fn delete(&self) {
+    pub fn delete(&self, fallible: bool) {
         if !self.is_deleted.get() {
             self.is_deleted.set(true);
 
@@ -106,9 +106,13 @@ impl WebGLRenderbuffer {
                 fb.detach_renderbuffer(self);
             }
 
-            self.upcast::<WebGLObject>()
-                .context()
-                .send_command(WebGLCommand::DeleteRenderbuffer(self.id));
+            let context = self.upcast::<WebGLObject>().context();
+            let cmd = WebGLCommand::DeleteRenderbuffer(self.id);
+            if fallible {
+                context.send_command_ignored(cmd);
+            } else {
+                context.send_command(cmd);
+            }
         }
     }
 
@@ -199,6 +203,6 @@ impl WebGLRenderbuffer {
 
 impl Drop for WebGLRenderbuffer {
     fn drop(&mut self) {
-        self.delete();
+        self.delete(true);
     }
 }

components/script/dom/webglrenderingcontext.rs

@@ -339,6 +339,12 @@ impl WebGLRenderingContext {
             .unwrap();
     }
 
+    pub fn send_command_ignored(&self, command: WebGLCommand) {
+        let _ = self
+            .webgl_sender
+            .send(command, capture_webgl_backtrace(self));
+    }
+
     #[inline]
     pub fn send_vr_command(&self, command: WebVRCommand) {
         self.webgl_sender.send_vr(command).unwrap();
@@ -1039,7 +1045,7 @@ impl WebGLRenderingContext {
                 self.current_vao.set(None);
                 self.send_command(WebGLCommand::BindVertexArray(None));
             }
-            vao.delete();
+            vao.delete(false);
         }
     }
 
@@ -2172,7 +2178,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
             self.bound_buffer_array.set(None);
             buffer.decrement_attached_counter();
         }
-        buffer.mark_for_deletion();
+        buffer.mark_for_deletion(false);
     }
 
     // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.6
@@ -2188,7 +2194,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
                     WebGLFramebufferBindingRequest::Default
                 ))
             );
-            framebuffer.delete()
+            framebuffer.delete(false)
         }
     }
 
@@ -2205,7 +2211,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
                     None
                 ))
             );
-            renderbuffer.delete()
+            renderbuffer.delete(false)
         }
     }
 
@@ -2240,7 +2246,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
                 ));
             }
 
-            texture.delete()
+            texture.delete(false)
         }
     }
 
@@ -2248,7 +2254,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
     fn DeleteProgram(&self, program: Option<&WebGLProgram>) {
         if let Some(program) = program {
             handle_potential_webgl_error!(self, self.validate_ownership(program), return);
-            program.mark_for_deletion()
+            program.mark_for_deletion(false)
         }
     }
 
@@ -2256,7 +2262,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
     fn DeleteShader(&self, shader: Option<&WebGLShader>) {
         if let Some(shader) = shader {
             handle_potential_webgl_error!(self, self.validate_ownership(shader), return);
-            shader.mark_for_deletion()
+            shader.mark_for_deletion(false)
         }
     }
 

components/script/dom/webglshader.rs

@@ -178,12 +178,16 @@ impl WebGLShader {
     /// Mark this shader as deleted (if it wasn't previously)
     /// and delete it as if calling glDeleteShader.
     /// Currently does not check if shader is attached
-    pub fn mark_for_deletion(&self) {
+    pub fn mark_for_deletion(&self, fallible: bool) {
         if !self.marked_for_deletion.get() {
             self.marked_for_deletion.set(true);
-            self.upcast::<WebGLObject>()
-                .context()
-                .send_command(WebGLCommand::DeleteShader(self.id));
+            let context = self.upcast::<WebGLObject>().context();
+            let cmd = WebGLCommand::DeleteShader(self.id);
+            if fallible {
+                context.send_command_ignored(cmd);
+            } else {
+                context.send_command(cmd);
+            }
         }
     }
 
@@ -230,6 +234,6 @@ impl WebGLShader {
 
 impl Drop for WebGLShader {
     fn drop(&mut self) {
-        self.mark_for_deletion();
+        self.mark_for_deletion(true);
     }
 }

components/script/dom/webgltexture.rs

@@ -180,7 +180,7 @@ impl WebGLTexture {
         self.populate_mip_chain(self.base_mipmap_level, last_level)
     }
 
-    pub fn delete(&self) {
+    pub fn delete(&self, fallible: bool) {
         if !self.is_deleted.get() {
             self.is_deleted.set(true);
             let context = self.upcast::<WebGLObject>().context();
@@ -204,7 +204,12 @@ impl WebGLTexture {
                 fb.detach_texture(self);
             }
 
-            context.send_command(WebGLCommand::DeleteTexture(self.id));
+            let cmd = WebGLCommand::DeleteTexture(self.id);
+            if fallible {
+                context.send_command_ignored(cmd);
+            } else {
+                context.send_command(cmd);
+            }
         }
     }
 
@@ -404,7 +409,7 @@ impl WebGLTexture {
 
 impl Drop for WebGLTexture {
     fn drop(&mut self) {
-        self.delete();
+        self.delete(true);
     }
 }
 

components/script/dom/webglvertexarrayobjectoes.rs

@@ -57,16 +57,20 @@ impl WebGLVertexArrayObjectOES {
         self.is_deleted.get()
     }
 
-    pub fn delete(&self) {
+    pub fn delete(&self, fallible: bool) {
         assert!(self.id.is_some());
         if self.is_deleted.get() {
             return;
         }
         self.is_deleted.set(true);
 
-        self.upcast::<WebGLObject>()
-            .context()
-            .send_command(WebGLCommand::DeleteVertexArray(self.id.unwrap()));
+        let context = self.upcast::<WebGLObject>().context();
+        let cmd = WebGLCommand::DeleteVertexArray(self.id.unwrap());
+        if fallible {
+            context.send_command_ignored(cmd);
+        } else {
+            context.send_command(cmd);
+        }
 
         for attrib_data in &**self.vertex_attribs.borrow() {
             if let Some(buffer) = attrib_data.buffer() {
@@ -248,7 +252,7 @@ impl WebGLVertexArrayObjectOES {
 impl Drop for WebGLVertexArrayObjectOES {
     fn drop(&mut self) {
         if self.id.is_some() {
-            self.delete();
+            self.delete(true);
         }
     }
 }