gpu/command_buffer/common/value_state.h

   1 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef GPU_COMMAND_BUFFER_COMMON_VALUE_STATE_H_
   6 #define GPU_COMMAND_BUFFER_COMMON_VALUE_STATE_H_
   7
   8 #include "base/containers/hash_tables.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "gpu/gpu_export.h"
  11
  12 namespace gpu {
  13
  14 // Used to maintain Valuebuffer state, exposed to browser to
  15 // support passing ValueStates via IPC.
  16 union GPU_EXPORT ValueState {
  17   float float_value[4];
  18   int int_value[4];
  19 };
  20
  21 // Refcounted wrapper for a hash_map of subscription targets to ValueStates
  22 class GPU_EXPORT ValueStateMap : public base::RefCounted<ValueStateMap> {
  23  public:
  24   ValueStateMap();
  25
  26   // Returns NULL if there is not ValueState for the target
  27   const ValueState* GetState(unsigned int target) const;
  28
  29   void UpdateState(unsigned int target, const ValueState& state);
  30
  31  protected:
  32   virtual ~ValueStateMap();
  33
  34  private:
  35   friend class base::RefCounted<ValueStateMap>;
  36
  37   typedef base::hash_map<unsigned int, ValueState> Map;
  38
  39   Map state_map_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(ValueStateMap);
  42 };
  43
  44 }  // namespace gpu
  45
  46 #endif  // GPU_COMMAND_BUFFER_COMMON_VALUE_STATE_H_