From f6c26ec593ba96d89cb3476c815d6f33a915bfdd Mon Sep 17 00:00:00 2001
From: Pierre Krieger <pierre.krieger1708@gmail.com>
Date: Tue, 16 Jun 2015 10:15:31 +0200
Subject: Handle errors from MakeCurrent and SwapBuffers

---
 src/api/egl/mod.rs | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

(limited to 'src/api/egl')

diff --git a/src/api/egl/mod.rs b/src/api/egl/mod.rs
index 3335de0..7b31017 100644
--- a/src/api/egl/mod.rs
+++ b/src/api/egl/mod.rs
@@ -2,6 +2,7 @@
 #![allow(unused_variables)]
 
 use BuilderAttribs;
+use ContextError;
 use CreationError;
 use GlContext;
 use GlRequest;
@@ -161,11 +162,18 @@ impl Context {
 }
 
 impl GlContext for Context {
-    unsafe fn make_current(&self) {
+    unsafe fn make_current(&self) -> Result<(), ContextError> {
         let ret = self.egl.MakeCurrent(self.display, self.surface, self.surface, self.context);
 
         if ret == 0 {
-            panic!("eglMakeCurrent failed");
+            if self.egl.GetError() as u32 == ffi::egl::CONTEXT_LOST {
+                return Err(ContextError::ContextLost);
+            } else {
+                panic!("eglMakeCurrent failed");
+            }
+
+        } else {
+            Ok(())
         }
     }
 
@@ -181,13 +189,20 @@ impl GlContext for Context {
         }
     }
 
-    fn swap_buffers(&self) {
+    fn swap_buffers(&self) -> Result<(), ContextError> {
         let ret = unsafe {
             self.egl.SwapBuffers(self.display, self.surface)
         };
 
         if ret == 0 {
-            panic!("eglSwapBuffers failed");
+            if unsafe { self.egl.GetError() } as u32 == ffi::egl::CONTEXT_LOST {
+                return Err(ContextError::ContextLost);
+            } else {
+                panic!("eglSwapBuffers failed");
+            }
+
+        } else {
+            Ok(())
         }
     }
 
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