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      1 /*
      2  * Copyright (C) 2013 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 #include "RenderBufferCache.h"
     18 #include "Debug.h"
     19 #include "DeviceInfo.h"
     20 #include "Properties.h"
     21 
     22 #include <utils/Log.h>
     23 
     24 #include <cstdlib>
     25 
     26 namespace android {
     27 namespace uirenderer {
     28 
     29 ///////////////////////////////////////////////////////////////////////////////
     30 // Defines
     31 ///////////////////////////////////////////////////////////////////////////////
     32 
     33 // Debug
     34 #if DEBUG_RENDER_BUFFERS
     35 #define RENDER_BUFFER_LOGD(...) ALOGD(__VA_ARGS__)
     36 #else
     37 #define RENDER_BUFFER_LOGD(...)
     38 #endif
     39 
     40 static uint32_t calculateRboCacheSize() {
     41     // TODO: Do we need to use extensions().has4BitStencil() here?
     42     // The tuning guide recommends it, but all real devices are configured
     43     // with a larger cache than necessary by 4x, so keep the 2x for now regardless
     44     return DeviceInfo::multiplyByResolution(2);
     45 }
     46 
     47 ///////////////////////////////////////////////////////////////////////////////
     48 // Constructors/destructor
     49 ///////////////////////////////////////////////////////////////////////////////
     50 
     51 RenderBufferCache::RenderBufferCache() : mSize(0), mMaxSize(calculateRboCacheSize()) {}
     52 
     53 RenderBufferCache::~RenderBufferCache() {
     54     clear();
     55 }
     56 
     57 ///////////////////////////////////////////////////////////////////////////////
     58 // Size management
     59 ///////////////////////////////////////////////////////////////////////////////
     60 
     61 uint32_t RenderBufferCache::getSize() {
     62     return mSize;
     63 }
     64 
     65 uint32_t RenderBufferCache::getMaxSize() {
     66     return mMaxSize;
     67 }
     68 
     69 ///////////////////////////////////////////////////////////////////////////////
     70 // Caching
     71 ///////////////////////////////////////////////////////////////////////////////
     72 
     73 int RenderBufferCache::RenderBufferEntry::compare(const RenderBufferCache::RenderBufferEntry& lhs,
     74                                                   const RenderBufferCache::RenderBufferEntry& rhs) {
     75     int deltaInt = int(lhs.mWidth) - int(rhs.mWidth);
     76     if (deltaInt != 0) return deltaInt;
     77 
     78     deltaInt = int(lhs.mHeight) - int(rhs.mHeight);
     79     if (deltaInt != 0) return deltaInt;
     80 
     81     return int(lhs.mFormat) - int(rhs.mFormat);
     82 }
     83 
     84 void RenderBufferCache::deleteBuffer(RenderBuffer* buffer) {
     85     if (buffer) {
     86         RENDER_BUFFER_LOGD("Deleted %s render buffer (%dx%d)",
     87                            RenderBuffer::formatName(buffer->getFormat()), buffer->getWidth(),
     88                            buffer->getHeight());
     89 
     90         mSize -= buffer->getSize();
     91         delete buffer;
     92     }
     93 }
     94 
     95 void RenderBufferCache::clear() {
     96     for (auto entry : mCache) {
     97         deleteBuffer(entry.mBuffer);
     98     }
     99     mCache.clear();
    100 }
    101 
    102 RenderBuffer* RenderBufferCache::get(GLenum format, const uint32_t width, const uint32_t height) {
    103     RenderBuffer* buffer = nullptr;
    104 
    105     RenderBufferEntry entry(format, width, height);
    106     auto iter = mCache.find(entry);
    107 
    108     if (iter != mCache.end()) {
    109         entry = *iter;
    110         mCache.erase(iter);
    111 
    112         buffer = entry.mBuffer;
    113         mSize -= buffer->getSize();
    114 
    115         RENDER_BUFFER_LOGD("Found %s render buffer (%dx%d)", RenderBuffer::formatName(format),
    116                            width, height);
    117     } else {
    118         buffer = new RenderBuffer(format, width, height);
    119 
    120         RENDER_BUFFER_LOGD("Created new %s render buffer (%dx%d)", RenderBuffer::formatName(format),
    121                            width, height);
    122     }
    123 
    124     buffer->bind();
    125     buffer->allocate();
    126 
    127     return buffer;
    128 }
    129 
    130 bool RenderBufferCache::put(RenderBuffer* buffer) {
    131     if (!buffer) return false;
    132 
    133     const uint32_t size = buffer->getSize();
    134     if (size < mMaxSize) {
    135         while (mSize + size > mMaxSize) {
    136             RenderBuffer* victim = mCache.begin()->mBuffer;
    137             deleteBuffer(victim);
    138             mCache.erase(mCache.begin());
    139         }
    140 
    141         RenderBufferEntry entry(buffer);
    142 
    143         mCache.insert(entry);
    144         mSize += size;
    145 
    146         RENDER_BUFFER_LOGD("Added %s render buffer (%dx%d)",
    147                            RenderBuffer::formatName(buffer->getFormat()), buffer->getWidth(),
    148                            buffer->getHeight());
    149 
    150         return true;
    151     } else {
    152         RENDER_BUFFER_LOGD("Deleted %s render buffer (%dx%d) Size=%d, MaxSize=%d",
    153                            RenderBuffer::formatName(buffer->getFormat()), buffer->getWidth(),
    154                            buffer->getHeight(), size, mMaxSize);
    155         delete buffer;
    156     }
    157     return false;
    158 }
    159 
    160 };  // namespace uirenderer
    161 };  // namespace android
    162