Index: gpu/command_buffer/service/path_manager.h |
diff --git a/gpu/command_buffer/service/path_manager.h b/gpu/command_buffer/service/path_manager.h |
new file mode 100644 |
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+// Copyright (c) 2015 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef GPU_COMMAND_BUFFER_SERVICE_PATH_MANAGER_H_ |
+#define GPU_COMMAND_BUFFER_SERVICE_PATH_MANAGER_H_ |
+ |
+#include <map> |
+ |
+#include "base/basictypes.h" |
+#include "gpu/command_buffer/service/gl_utils.h" |
+#include "gpu/gpu_export.h" |
+ |
+namespace gpu { |
+namespace gles2 { |
+ |
+// This class keeps track of paths and their client and service ids |
+// so we can correctly clear them. |
+class GPU_EXPORT PathManager { |
+ public: |
+ PathManager(); |
+ ~PathManager(); |
+ |
+ // Must call before destruction. |
+ void Destroy(bool have_context); |
+ |
+ // Creates a path mapping between closed intervals |
+ // [first_client_id, last_client_id] -> [first_service_id, ...]. |
+ void CreatePathRange(GLuint first_client_id, |
+ GLuint last_client_id, |
+ GLuint first_service_id); |
+ |
+ // Returns true if any path exists in the closed interval |
+ // [first_client_id, last_client_id]. |
+ bool HasPathsInRange(GLuint first_client_id, GLuint last_client_id) const; |
+ |
+ // Gets the path id corresponding the client path id. |
+ // Returns false if no such service path id was not found. |
+ bool GetPath(GLuint client_id, GLuint* service_id) const; |
+ |
+ // Removes a closed interval of paths [first_client_id, last_client_id]. |
+ void RemovePaths(GLuint first_client_id, GLuint last_client_id); |
+ |
+ private: |
+ // Mapping between client id and service id. |
+ // Should be used only by the implementation. |
+ struct PathRangeDescription { |
+ PathRangeDescription(GLuint last_client, GLuint first_service) |
+ : last_client_id(last_client), first_service_id(first_service) {} |
+ GLuint last_client_id; |
+ GLuint first_service_id; |
+ typedef GLuint ServiceIdType; |
+ }; |
+ typedef std::map<GLuint, PathRangeDescription> PathRangeMap; |
+ |
+ template <typename RangeIterator> |
+ static GLuint RangeSize(const RangeIterator& it) { |
+ return it->second.last_client_id - it->first + 1; |
+ } |
+ template <typename RangeIterator> |
+ static GLuint FirstClientId(const RangeIterator& it) { |
+ return it->first; |
+ } |
+ template <typename RangeIterator> |
+ static GLuint FirstServiceId(const RangeIterator& it) { |
+ return it->second.first_service_id; |
+ } |
+ template <typename RangeIterator> |
+ static GLuint LastServiceId(const RangeIterator& it) { |
+ return FirstServiceId(it) + RangeSize(it) - 1; |
+ } |
+ static GLuint LastClientId(PathManager::PathRangeMap::const_iterator& it) { |
+ return it->second.last_client_id; |
+ } |
+ // Note: this one can be assigned to. |
+ static GLuint& LastClientId(PathManager::PathRangeMap::iterator& it) { |
+ return it->second.last_client_id; |
+ } |
+ |
+ template <typename T> |
+ struct IteratorSelector { |
+ typedef typename T::iterator iterator; |
+ }; |
+ template <typename T> |
+ struct IteratorSelector<const T> { |
+ typedef typename T::const_iterator iterator; |
+ }; |
+ |
+ // Returns the range position that contains |client_id| or |
+ // |PathRangeMap::iterator::end()| if |client_id| is not found. |
+ template <typename MapType> |
+ static typename IteratorSelector<MapType>::iterator GetContainingRange( |
+ MapType& path_map, |
+ GLuint client_id); |
+ |
+ // Returns the range position that contains |client_id|. If that is |
+ // not available, returns the range that has smallest |
+ // |first_client_id| that is bigger than |client_id|. Returns |
+ // |PathRangeMap::iterator::end()| if there is no such range. |
+ template <typename MapType> |
+ static typename IteratorSelector<MapType>::iterator GetContainingOrNextRange( |
+ MapType& path_map, |
+ GLuint client_id); |
+ |
+ // Checks for consistency inside the book-keeping structures. Used as |
+ // DCHECK pre/post condition in mutating functions. |
+ bool CheckConsistency(); |
+ |
+ PathRangeMap path_map_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(PathManager); |
+}; |
+ |
+} // namespace gles2 |
+} // namespace gpu |
+ |
+#endif // GPU_COMMAND_BUFFER_SERVICE_PATH_MANAGER_H_ |