Improved the WebGL2 framebuffer render validation

It seems `MissingColorAttachment` should be returned only when
all of the color attachments are missing.

components/script/dom/webglframebuffer.rs

@@ -468,7 +468,7 @@ impl WebGLFramebuffer {
             return CompleteForRendering::Complete;
         }
 
-        if self.colors.iter().any(|att| att.borrow().is_none()) {
+        if self.colors.iter().all(|att| att.borrow().is_none()) {
             return CompleteForRendering::MissingColorAttachment;
         }
 

tests/wpt/webgl/meta/conformance2/rendering/framebuffer-texture-changing-base-level.html.ini

@@ -8,24 +8,9 @@
   [WebGL test #8: getError expected: NO_ERROR. Was INVALID_ENUM : Setup framebuffer with texture should succeed.]
     expected: FAIL
 
-  [WebGL test #3: getError expected: NO_ERROR. Was INVALID_OPERATION : Clearing the texture level 0 to green should succeed.]
-    expected: FAIL
-
-  [WebGL test #9: getError expected: NO_ERROR. Was INVALID_OPERATION : Clearing the texture level 2 to green should succeed.]
-    expected: FAIL
-
-  [WebGL test #6: getError expected: NO_ERROR. Was INVALID_OPERATION : Clearing the texture level 1 to green should succeed.]
-    expected: FAIL
-
-  [WebGL test #14: should be green\nat (0, 0) expected: 0,255,0,255 was 0,0,0,0]
-    expected: FAIL
-
   [WebGL test #13: getError expected: NO_ERROR. Was INVALID_ENUM : Drawing the texture to default framebuffer with base level 0 should succeed.]
     expected: FAIL
 
   [WebGL test #2: getError expected: NO_ERROR. Was INVALID_ENUM : Setup framebuffer with texture should succeed.]
     expected: FAIL
 
-  [WebGL test #12: getError expected: NO_ERROR. Was INVALID_OPERATION : Clearing the texture level 3 to green should succeed.]
-    expected: FAIL
-