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+/*
+ * Copyright 2009, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#ifndef O3D_COMMAND_BUFFER_COMMON_CROSS_CONSTANTS_H_
+#define O3D_COMMAND_BUFFER_COMMON_CROSS_CONSTANTS_H_
+
+#include "base/basictypes.h"
+
+namespace command_buffer {
+
+typedef int32 CommandBufferOffset;
+const CommandBufferOffset kInvalidCommandBufferOffset = -1;
+
+// Status of the command buffer service. It does not process commands
+// (meaning: get will not change) unless in kParsing state.
+namespace parser_status {
+  enum ParserStatus {
+    kNotConnected,  // The service is not connected - initial state.
+    kNoBuffer,      // The service is connected but no buffer was set.
+    kParsing,       // The service is connected, and parsing commands from the
+                    // buffer.
+    kParseError,    // Parsing stopped because a parse error was found.
+  };
+}
+
+namespace parse_error {
+  enum ParseError {
+    kParseNoError,
+    kParseInvalidSize,
+    kParseOutOfBounds,
+    kParseUnknownCommand,
+    kParseInvalidArguments,
+  };
+}
+
+// Invalid shared memory Id, returned by RegisterSharedMemory in case of
+// failure.
+const int32 kInvalidSharedMemoryId = -1;
+
+}  // namespace command_buffer
+
+#endif  // O3D_COMMAND_BUFFER_COMMON_CROSS_CONSTANTS_H_