benvanik@google.com | 1a23334 | 2011-04-28 19:44:39 +0000 | [diff] [blame] | 1 | // |
| 2 | // Copyright (c) 2002-2011 The ANGLE Project Authors. All rights reserved. |
| 3 | // Use of this source code is governed by a BSD-style license that can be |
| 4 | // found in the LICENSE file. |
| 5 | // |
| 6 | |
| 7 | // HandleAllocator.cpp: Implements the gl::HandleAllocator class, which is used |
| 8 | // to allocate GL handles. |
| 9 | |
| 10 | #include "libGLESv2/HandleAllocator.h" |
| 11 | |
| 12 | #include "libGLESv2/main.h" |
| 13 | |
| 14 | namespace gl |
| 15 | { |
| 16 | |
| 17 | HandleAllocator::HandleAllocator() : mBaseValue(1), mNextValue(1) |
| 18 | { |
| 19 | } |
| 20 | |
| 21 | HandleAllocator::~HandleAllocator() |
| 22 | { |
| 23 | } |
| 24 | |
| 25 | void HandleAllocator::setBaseHandle(GLuint value) |
| 26 | { |
| 27 | ASSERT(mBaseValue == mNextValue); |
| 28 | mBaseValue = value; |
| 29 | mNextValue = value; |
| 30 | } |
| 31 | |
| 32 | GLuint HandleAllocator::allocate() |
| 33 | { |
| 34 | if (mFreeValues.size()) |
| 35 | { |
| 36 | GLuint handle = mFreeValues.back(); |
| 37 | mFreeValues.pop_back(); |
| 38 | return handle; |
| 39 | } |
| 40 | return mNextValue++; |
| 41 | } |
| 42 | |
| 43 | void HandleAllocator::release(GLuint handle) |
| 44 | { |
| 45 | if (handle == mNextValue - 1) |
| 46 | { |
benvanik@google.com | 07792e5 | 2011-05-05 19:38:32 +0000 | [diff] [blame] | 47 | // Don't drop below base value |
| 48 | if(mNextValue > mBaseValue) |
| 49 | { |
| 50 | mNextValue--; |
| 51 | } |
benvanik@google.com | 1a23334 | 2011-04-28 19:44:39 +0000 | [diff] [blame] | 52 | } |
benvanik@google.com | 07792e5 | 2011-05-05 19:38:32 +0000 | [diff] [blame] | 53 | else |
| 54 | { |
| 55 | // Only free handles that we own - don't drop below the base value |
| 56 | if (handle >= mBaseValue) |
| 57 | { |
| 58 | mFreeValues.push_back(handle); |
| 59 | } |
| 60 | } |
benvanik@google.com | 1a23334 | 2011-04-28 19:44:39 +0000 | [diff] [blame] | 61 | } |
| 62 | |
| 63 | } |