2 files changed, 18 insertions, 8 deletions
diff --git a/components/script/dom/webglframebuffer.rs b/components/script/dom/webglframebuffer.rs
index 83814bd2f30..09a1cbea7cc 100644
--- a/components/script/dom/webglframebuffer.rs
+++ b/components/script/dom/webglframebuffer.rs
@@ -18,6 +18,12 @@ use dom::webgltexture::WebGLTexture;
 use dom_struct::dom_struct;
 use std::cell::Cell;
 
+pub enum CompleteForRendering {
+    Complete,
+    Incomplete,
+    MissingColorAttachment,
+}
+
 #[must_root]
 #[derive(Clone, JSTraceable, MallocSizeOf)]
 enum WebGLFramebufferAttachment {
@@ -214,14 +220,14 @@ impl WebGLFramebuffer {
         return self.status.get();
     }
 
-    pub fn check_status_for_rendering(&self) -> u32 {
+    pub fn check_status_for_rendering(&self) -> CompleteForRendering {
         let result = self.check_status();
         if result != constants::FRAMEBUFFER_COMPLETE {
-            return result;
+            return CompleteForRendering::Incomplete;
         }
 
         if self.color.borrow().is_none() {
-            return constants::FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
+            return CompleteForRendering::MissingColorAttachment;
         }
 
         if !self.is_initialized.get() {
@@ -245,7 +251,7 @@ impl WebGLFramebuffer {
             self.is_initialized.set(true);
         }
 
-        constants::FRAMEBUFFER_COMPLETE
+        CompleteForRendering::Complete
     }
 
     pub fn renderbuffer(&self, attachment: u32, rb: Option<&WebGLRenderbuffer>) -> WebGLResult<()> {
diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index c4ea4667cbd..db0fabf452d 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -39,7 +39,7 @@ use dom::webgl_validations::types::{TexDataType, TexFormat, TexImageTarget};
 use dom::webglactiveinfo::WebGLActiveInfo;
 use dom::webglbuffer::WebGLBuffer;
 use dom::webglcontextevent::WebGLContextEvent;
-use dom::webglframebuffer::{WebGLFramebuffer, WebGLFramebufferAttachmentRoot};
+use dom::webglframebuffer::{WebGLFramebuffer, WebGLFramebufferAttachmentRoot, CompleteForRendering};
 use dom::webglobject::WebGLObject;
 use dom::webglprogram::WebGLProgram;
 use dom::webglrenderbuffer::WebGLRenderbuffer;
@@ -339,10 +339,14 @@ impl WebGLRenderingContext {
     // this: clear() and getParameter(IMPLEMENTATION_COLOR_READ_*).
     fn validate_framebuffer(&self) -> WebGLResult<()> {
         match self.bound_framebuffer.get() {
-            Some(ref fb) if fb.check_status_for_rendering() != constants::FRAMEBUFFER_COMPLETE => {
-                Err(InvalidFramebufferOperation)
+            Some(fb) => match fb.check_status_for_rendering() {
+                CompleteForRendering::Complete => Ok(()),
+                CompleteForRendering::Incomplete =>
+                    Err(InvalidFramebufferOperation),
+                CompleteForRendering::MissingColorAttachment =>
+                    Err(InvalidOperation),
             },
-            _ => Ok(()),
+            None => Ok(()),
         }
     }