michael@0: #include "precompiled.h"
michael@0: //
michael@0: // Copyright (c) 2002-2011 The ANGLE Project Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: //
michael@0: 
michael@0: // HandleAllocator.cpp: Implements the gl::HandleAllocator class, which is used
michael@0: // to allocate GL handles.
michael@0: 
michael@0: #include "libGLESv2/HandleAllocator.h"
michael@0: 
michael@0: #include "libGLESv2/main.h"
michael@0: 
michael@0: namespace gl
michael@0: {
michael@0: 
michael@0: HandleAllocator::HandleAllocator() : mBaseValue(1), mNextValue(1)
michael@0: {
michael@0: }
michael@0: 
michael@0: HandleAllocator::~HandleAllocator()
michael@0: {
michael@0: }
michael@0: 
michael@0: void HandleAllocator::setBaseHandle(GLuint value)
michael@0: {
michael@0:     ASSERT(mBaseValue == mNextValue);
michael@0:     mBaseValue = value;
michael@0:     mNextValue = value;
michael@0: }
michael@0: 
michael@0: GLuint HandleAllocator::allocate()
michael@0: {
michael@0:     if (mFreeValues.size())
michael@0:     {
michael@0:         GLuint handle = mFreeValues.back();
michael@0:         mFreeValues.pop_back();
michael@0:         return handle;
michael@0:     }
michael@0:     return mNextValue++;
michael@0: }
michael@0: 
michael@0: void HandleAllocator::release(GLuint handle)
michael@0: {
michael@0:     if (handle == mNextValue - 1)
michael@0:     {
michael@0:         // Don't drop below base value
michael@0:         if(mNextValue > mBaseValue)
michael@0:         {
michael@0:             mNextValue--;
michael@0:         }
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         // Only free handles that we own - don't drop below the base value
michael@0:         if (handle >= mBaseValue)
michael@0:         {
michael@0:             mFreeValues.push_back(handle);
michael@0:         }
michael@0:     }
michael@0: }
michael@0: 
michael@0: }