Webgl fixes

components/script/dom/webglrenderingcontext.rs

@@ -1326,6 +1326,14 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
                 "WebGL GLSL ES 1.0".to_jsval(cx, rval.handle_mut());
                 return rval.get();
             }
+            constants::UNPACK_FLIP_Y_WEBGL => {
+                let unpack = self.texture_unpacking_settings.get();
+                return BooleanValue(unpack.contains(TextureUnpacking::FLIP_Y_AXIS));
+            }
+            constants::UNPACK_PREMULTIPLY_ALPHA_WEBGL => {
+                let unpack = self.texture_unpacking_settings.get();
+                return BooleanValue(unpack.contains(TextureUnpacking::PREMULTIPLY_ALPHA));
+            }
             _ => {}
         }
 
@@ -1412,13 +1420,7 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
         let (sender, receiver) = webgl_channel().unwrap();
         self.send_command(WebGLCommand::GetTexParameter(target, pname, sender));
 
-        match receiver.recv().unwrap() {
-            value if value != 0 => Int32Value(value),
-            _ => {
-                self.webgl_error(InvalidEnum);
-                NullValue()
-            }
-        }
+        Int32Value(receiver.recv().unwrap())
     }
 
     // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.3

tests/wpt/mozilla/meta/webgl/conformance-1.0.3/conformance/state/gl-get-calls.html.ini

@@ -57,12 +57,6 @@
   [WebGL test #47: context.getParameter(context.SCISSOR_TEST) should be false (of type boolean). Was null (of type object).]
     expected: FAIL
 
-  [WebGL test #85: context.getParameter(context.UNPACK_FLIP_Y_WEBGL) should be false (of type boolean). Was null (of type object).]
-    expected: FAIL
-
-  [WebGL test #86: context.getParameter(context.UNPACK_PREMULTIPLY_ALPHA_WEBGL) should be false (of type boolean). Was null (of type object).]
-    expected: FAIL
-
   [WebGL test #88: context.getParameter(context.VIEWPORT) is not an instance of Int32Array]
     expected: FAIL