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      1 #include "precompiled.h"
      2 //
      3 // Copyright (c) 2002-2011 The ANGLE Project Authors. All rights reserved.
      4 // Use of this source code is governed by a BSD-style license that can be
      5 // found in the LICENSE file.
      6 //
      7 
      8 // HandleAllocator.cpp: Implements the gl::HandleAllocator class, which is used
      9 // to allocate GL handles.
     10 
     11 #include "libGLESv2/HandleAllocator.h"
     12 
     13 #include "libGLESv2/main.h"
     14 
     15 namespace gl
     16 {
     17 
     18 HandleAllocator::HandleAllocator() : mBaseValue(1), mNextValue(1)
     19 {
     20 }
     21 
     22 HandleAllocator::~HandleAllocator()
     23 {
     24 }
     25 
     26 void HandleAllocator::setBaseHandle(GLuint value)
     27 {
     28     ASSERT(mBaseValue == mNextValue);
     29     mBaseValue = value;
     30     mNextValue = value;
     31 }
     32 
     33 GLuint HandleAllocator::allocate()
     34 {
     35     if (mFreeValues.size())
     36     {
     37         GLuint handle = mFreeValues.back();
     38         mFreeValues.pop_back();
     39         return handle;
     40     }
     41     return mNextValue++;
     42 }
     43 
     44 void HandleAllocator::release(GLuint handle)
     45 {
     46     if (handle == mNextValue - 1)
     47     {
     48         // Don't drop below base value
     49         if(mNextValue > mBaseValue)
     50         {
     51             mNextValue--;
     52         }
     53     }
     54     else
     55     {
     56         // Only free handles that we own - don't drop below the base value
     57         if (handle >= mBaseValue)
     58         {
     59             mFreeValues.push_back(handle);
     60         }
     61     }
     62 }
     63 
     64 }
     65