1 files changed, 54 insertions, 0 deletions
diff --git a/dom/canvas/WebGLQuery.h b/dom/canvas/WebGLQuery.h
new file mode 100644
index 0000000000..9480e4acde
--- /dev/null
+++ b/dom/canvas/WebGLQuery.h
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef WEBGL_QUERY_H_
+#define WEBGL_QUERY_H_
+
+#include "WebGLObjectModel.h"
+#include "nsThreadUtils.h"
+
+namespace mozilla {
+namespace webgl {
+class AvailabilityRunnable;
+}  // namespace webgl
+
+class WebGLQuery final : public WebGLContextBoundObject {
+  friend class webgl::AvailabilityRunnable;
+
+  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(WebGLQuery, override)
+
+ public:
+  const GLuint mGLName;
+
+ private:
+  GLenum mTarget;
+  RefPtr<WebGLQuery>* mActiveSlot;
+
+  bool mCanBeAvailable = false;  // Track whether the event loop has spun
+
+  ////
+ public:
+  GLenum Target() const { return mTarget; }
+  bool IsActive() const { return bool(mActiveSlot); }
+
+  ////
+
+  explicit WebGLQuery(WebGLContext* webgl);
+
+ private:
+  ~WebGLQuery() override;
+
+ public:
+  ////
+
+  void BeginQuery(GLenum target, RefPtr<WebGLQuery>& slot);
+  void EndQuery();
+  Maybe<double> GetQueryParameter(GLenum pname) const;
+  void QueryCounter();
+};
+
+}  // namespace mozilla
+
+#endif  // WEBGL_QUERY_H_