1 files changed, 64 insertions, 0 deletions
diff --git a/gfx/angle/src/libANGLE/renderer/gl/QueryGL.h b/gfx/angle/src/libANGLE/renderer/gl/QueryGL.h
new file mode 100755
index 000000000..5e280b1f7
--- /dev/null
+++ b/gfx/angle/src/libANGLE/renderer/gl/QueryGL.h
@@ -0,0 +1,64 @@
+//
+// Copyright 2015 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// QueryGL.h: Defines the class interface for QueryGL.
+
+#ifndef LIBANGLE_RENDERER_GL_QUERYGL_H_
+#define LIBANGLE_RENDERER_GL_QUERYGL_H_
+
+#include <deque>
+
+#include "libANGLE/renderer/QueryImpl.h"
+
+namespace rx
+{
+
+class FunctionsGL;
+class StateManagerGL;
+
+class QueryGL : public QueryImpl
+{
+  public:
+    QueryGL(GLenum type, const FunctionsGL *functions, StateManagerGL *stateManager);
+    ~QueryGL() override;
+
+    gl::Error begin() override;
+    gl::Error end() override;
+    gl::Error queryCounter() override;
+    gl::Error getResult(GLint *params) override;
+    gl::Error getResult(GLuint *params) override;
+    gl::Error getResult(GLint64 *params) override;
+    gl::Error getResult(GLuint64 *params) override;
+    gl::Error isResultAvailable(bool *available) override;
+
+    // OpenGL is only allowed to have one query of each type active at any given time. Since ANGLE
+    // virtualizes contexts, queries need to be able to be paused and resumed.
+    // A query is "paused" by ending it and pushing the ID into a list of queries awaiting readback.
+    // When it is "resumed", a new query is generated and started.
+    // When a result is required, the queries are "flushed" by iterating over the list of pending
+    // queries and merging their results.
+    gl::Error pause();
+    gl::Error resume();
+
+  private:
+    gl::Error flush(bool force);
+
+    template <typename T>
+    gl::Error getResultBase(T *params);
+
+    GLenum mType;
+
+    const FunctionsGL *mFunctions;
+    StateManagerGL *mStateManager;
+
+    GLuint mActiveQuery;
+    std::deque<GLuint> mPendingQueries;
+    GLuint64 mResultSum;
+};
+
+}
+
+#endif // LIBANGLE_RENDERER_GL_QUERYGL_H_