1 files changed, 67 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/HandleAllocator.h b/gfx/angle/checkout/src/libANGLE/HandleAllocator.h
new file mode 100644
index 0000000000..e76590f9b3
--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/HandleAllocator.h
@@ -0,0 +1,67 @@
+//
+// Copyright (c) 2002-2011 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.
+//
+
+// HandleAllocator.h: Defines the gl::HandleAllocator class, which is used to
+// allocate GL handles.
+
+#ifndef LIBANGLE_HANDLEALLOCATOR_H_
+#define LIBANGLE_HANDLEALLOCATOR_H_
+
+#include "common/angleutils.h"
+
+#include "angle_gl.h"
+
+namespace gl
+{
+
+class HandleAllocator final : angle::NonCopyable
+{
+  public:
+    // Maximum handle = MAX_UINT-1
+    HandleAllocator();
+    // Specify maximum handle value. Used for testing.
+    HandleAllocator(GLuint maximumHandleValue);
+
+    ~HandleAllocator();
+
+    void setBaseHandle(GLuint value);
+
+    GLuint allocate();
+    void release(GLuint handle);
+    void reserve(GLuint handle);
+    void reset();
+
+    void enableLogging(bool enabled);
+
+  private:
+    GLuint mBaseValue;
+    GLuint mNextValue;
+    typedef std::vector<GLuint> HandleList;
+    HandleList mFreeValues;
+
+    // Represents an inclusive range [begin, end]
+    struct HandleRange
+    {
+        HandleRange(GLuint beginIn, GLuint endIn) : begin(beginIn), end(endIn) {}
+
+        GLuint begin;
+        GLuint end;
+    };
+
+    struct HandleRangeComparator;
+
+    // The freelist consists of never-allocated handles, stored
+    // as ranges, and handles that were previously allocated and
+    // released, stored in a heap.
+    std::vector<HandleRange> mUnallocatedList;
+    std::vector<GLuint> mReleasedList;
+
+    bool mLoggingEnabled;
+};
+
+}  // namespace gl
+
+#endif  // LIBANGLE_HANDLEALLOCATOR_H_