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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_HWUI_FBO_CACHE_H
     18 #define ANDROID_HWUI_FBO_CACHE_H
     19 
     20 #include <GLES2/gl2.h>
     21 
     22 #include <utils/SortedVector.h>
     23 
     24 namespace android {
     25 namespace uirenderer {
     26 
     27 ///////////////////////////////////////////////////////////////////////////////
     28 // Cache
     29 ///////////////////////////////////////////////////////////////////////////////
     30 
     31 class FboCache {
     32 public:
     33     FboCache();
     34     ~FboCache();
     35 
     36     /**
     37      * Returns an FBO from the cache. If no FBO is available, a new one
     38      * is created. If creating a new FBO fails, 0 is returned.
     39      *
     40      * When an FBO is obtained from the cache, it is removed and the
     41      * total number of FBOs available in the cache decreases.
     42      *
     43      * @return The name of the FBO, or 0 if no FBO can be obtained.
     44      */
     45     GLuint get();
     46 
     47     /**
     48      * Adds the specified FBO to the cache.
     49      *
     50      * @param fbo The FBO to add to the cache.
     51      *
     52      * @return True if the FBO was added, false otherwise.
     53      */
     54     bool put(GLuint fbo);
     55 
     56     /**
     57      * Clears the cache. This causes all FBOs to be deleted.
     58      */
     59     void clear();
     60 
     61     /**
     62      * Returns the current size of the cache.
     63      */
     64     uint32_t getSize();
     65 
     66     /**
     67      * Returns the maximum number of FBOs that the cache can hold.
     68      */
     69     uint32_t getMaxSize();
     70 
     71 private:
     72     SortedVector<GLuint> mCache;
     73     uint32_t mMaxSize;
     74 };  // class FboCache
     75 
     76 };  // namespace uirenderer
     77 };  // namespace android
     78 
     79 #endif  // ANDROID_HWUI_FBO_CACHE_H
     80