mirror of
https://github.com/DrBeef/JKXR.git
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4597b03873
Opens in Android Studio but haven't even tried to build it yet (it won't.. I know that much!)
301 lines
10 KiB
C++
301 lines
10 KiB
C++
/*
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===========================================================================
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Copyright (C) 2000 - 2013, Raven Software, Inc.
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Copyright (C) 2001 - 2013, Activision, Inc.
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Copyright (C) 2013 - 2015, OpenJK contributors
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This file is part of the OpenJK source code.
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OpenJK is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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===========================================================================
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*/
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////////////////////////////////////////////////////////////////////////////////////////
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// RAVEN STANDARD TEMPLATE LIBRARY
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// (c) 2002 Activision
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//
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//
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// Handle Pool
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// -----------
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// The memory pool class is a simple routine for constant time allocation and deallocation
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// from a fixed size pool of objects. The class uses a simple array to hold the actual
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// data, a queue for the free list, and a bit field to mark which spots in the array
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// are allocated.
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//
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// In addition to the standard memory pool features, this Handle Pool provides a fast
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// iterator, asserts on attempting to access unused data, and a unique ID "handle" for
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// the external system to use.
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//
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//
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//
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// NOTES:
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////////////
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#if !defined(RATL_HANDLE_POOL_VS_INC)
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#define RATL_HANDLE_POOL_VS_INC
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////////////////////////////////////////////////////////////////////////////////////////
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// Includes
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////////////////////////////////////////////////////////////////////////////////////////
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#if !defined(RATL_COMMON_INC)
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#include "ratl_common.h"
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#endif
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#if !defined(RATL_POOL_VS_INC)
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#include "pool_vs.h"
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#endif
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namespace ratl
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{
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template <class T>
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class handle_pool_base : public pool_root<T>
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{
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public:
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typedef T TStorageTraits;
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typedef typename T::TValue TTValue;
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////////////////////////////////////////////////////////////////////////////////////
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// Capacity Enum
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////////////////////////////////////////////////////////////////////////////////////
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static const int CAPACITY = T::CAPACITY;
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private:
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int mHandles[CAPACITY];
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int mMASK_HANDLE_TO_INDEX;
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int mMASK_NUM_BITS;
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void IncHandle(int index)
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{
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mHandles[index] += (1<<mMASK_NUM_BITS);
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if (mHandles[index]<0)
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{
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// we rolled over
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mHandles[index] = index; // Reset The ID Counter
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mHandles[index] |= (1<<mMASK_NUM_BITS);
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}
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}
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public:
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////////////////////////////////////////////////////////////////////////////////////
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// Constructor
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//
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// We need a routine to calculate the MASK used to convert a handle to an index and
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// the number of bits needed to shift by.
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//
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////////////////////////////////////////////////////////////////////////////////////
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handle_pool_base()
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{
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mMASK_HANDLE_TO_INDEX = 0;
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mMASK_NUM_BITS = 0;
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int value=CAPACITY-1;
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while(value)
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{
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value>>= 1;
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mMASK_HANDLE_TO_INDEX <<= 1;
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mMASK_HANDLE_TO_INDEX |= 1;
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mMASK_NUM_BITS++;
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}
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for (int i=0; i<CAPACITY; i++)
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{
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#ifdef _DEBUG
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mHandles[i] = i; // Reset The ID Counter
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mHandles[i] |= ((++HandleSaltValue)<<mMASK_NUM_BITS);
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#else
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mHandles[i] = i; // Reset The ID Counter
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mHandles[i] |= (1<<mMASK_NUM_BITS);
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#endif
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}
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}
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////////////////////////////////////////////////////////////////////////////////////
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// Clear - Removes all allocation information
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////////////////////////////////////////////////////////////////////////////////////
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void clear()
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{
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pool_root<T>::clear();
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// note that we do not refill the handles cause we want old handles to still be stale
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for (int i=0; i<CAPACITY; i++)
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{
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IncHandle(i);
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}
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}
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////////////////////////////////////////////////////////////////////////////////////
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// Constant Accessor
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////////////////////////////////////////////////////////////////////////////////////
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const TTValue& operator[](int handle) const
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{
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assert(is_used(handle)); //typically this is a stale handle (already been freed)
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return pool_root<T>::value_at_index(handle&mMASK_HANDLE_TO_INDEX);
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}
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////////////////////////////////////////////////////////////////////////////////////
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// Accessor
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////////////////////////////////////////////////////////////////////////////////////
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TTValue& operator[](int i)
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{
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assert(is_used(i)); //typically this is a stale handle (already been freed)
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return pool_root<T>::value_at_index(i&mMASK_HANDLE_TO_INDEX);
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}
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bool is_used(int i) const
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{
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if (mHandles[i&mMASK_HANDLE_TO_INDEX]==i)
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{
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return pool_root<T>::is_used_index(i&mMASK_HANDLE_TO_INDEX);
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}
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return false;
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}
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////////////////////////////////////////////////////////////////////////////////////
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// Swap two items based on handle
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////////////////////////////////////////////////////////////////////////////////////
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void swap(int i,int j)
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{
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assert(is_used(i)); //typically this is a stale handle (already been freed)
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assert(is_used(j)); //typically this is a stale handle (already been freed)
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swap_index(handle_to_index(i),handle_to_index(j));
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}
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////////////////////////////////////////////////////////////////////////////////////
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// The Allocator returns a handle
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////////////////////////////////////////////////////////////////////////////////////
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int alloc()
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{
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int index=pool_root<T>::alloc_index();
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return mHandles[index];
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}
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////////////////////////////////////////////////////////////////////////////////////
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// The Allocator, with value, returns a handle
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////////////////////////////////////////////////////////////////////////////////////
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int alloc(const TTValue &v)
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{
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int index=pool_root<T>::alloc_index(v);
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return mHandles[index];
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}
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////////////////////////////////////////////////////////////////////////////////////
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// The Deallocator, by index, not something generally needed
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////////////////////////////////////////////////////////////////////////////////////
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void free_index(int index)
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{
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pool_root<T>::free_index(index);
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IncHandle(index);
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}
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////////////////////////////////////////////////////////////////////////////////////
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// The Deallocator, by handle
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////////////////////////////////////////////////////////////////////////////////////
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void free(int handle)
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{
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assert(is_used(handle));
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free_index(handle&mMASK_HANDLE_TO_INDEX);
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}
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////////////////////////////////////////////////////////////////////////////////////
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// The Deallocator, by pointer
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////////////////////////////////////////////////////////////////////////////////////
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void free(TTValue *me)
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{
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free_index(pointer_to_index(me));
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}
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////////////////////////////////////////////////////////////////////////////////////
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// Convert a handle to a raw index, not generally something you should use
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////////////////////////////////////////////////////////////////////////////////////
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int handle_to_index(int handle) const
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{
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assert(is_used(handle));
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return (handle&mMASK_HANDLE_TO_INDEX);
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}
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////////////////////////////////////////////////////////////////////////////////////
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// FInd the handle for a given index, this cannot check for stale handles, so it is ill advised
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////////////////////////////////////////////////////////////////////////////////////
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int index_to_handle(int index) const
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{
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assert(index>=0 && index<CAPACITY && pool_root<T>::is_used_index(index)); //disallowing this on stale handles
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return (mHandles[index]);
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}
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////////////////////////////////////////////////////////////////////////////////////
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// converts a T pointer to a handle, generally not something you need, cannot check for stale handles
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////////////////////////////////////////////////////////////////////////////////////
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int pointer_to_handle(const TTValue *me) const
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{
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return index_to_handle(pool_root<T>::pointer_to_index(me));
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}
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////////////////////////////////////////////////////////////////////////////////////
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// converts a T pointer to a handle, generally not something you need, cannot check for stale handles
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////////////////////////////////////////////////////////////////////////////////////
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int pointer_to_handle(const TRatlNew *me) const
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{
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return index_to_handle(pool_root<T>::pointer_to_index(me));
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}
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////////////////////////////////////////////////////////////////////////////////////
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// Get An Iterator To The Object At handle
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////////////////////////////////////////////////////////////////////////////////////
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typename pool_root<T>::iterator at(int handle)
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{
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assert(is_used(handle));
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return pool_root<T>::at_index(handle&mMASK_HANDLE_TO_INDEX);
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}
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////////////////////////////////////////////////////////////////////////////////////
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// Get An Iterator To The Object At handle
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////////////////////////////////////////////////////////////////////////////////////
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typename pool_root<T>::const_iterator at(int handle) const
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{
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assert(is_used(handle));
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return pool_root<T>::at_index(handle&mMASK_HANDLE_TO_INDEX);
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}
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};
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template<class T, int ARG_CAPACITY>
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class handle_pool_vs : public handle_pool_base<storage::value_semantics<T,ARG_CAPACITY> >
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{
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public:
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typedef typename storage::value_semantics<T,ARG_CAPACITY> TStorageTraits;
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typedef typename TStorageTraits::TValue TTValue;
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static const int CAPACITY = ARG_CAPACITY;
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handle_pool_vs() {}
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};
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template<class T, int ARG_CAPACITY>
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class handle_pool_os : public handle_pool_base<storage::object_semantics<T,ARG_CAPACITY> >
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{
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public:
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typedef typename storage::object_semantics<T,ARG_CAPACITY> TStorageTraits;
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typedef typename TStorageTraits::TValue TTValue;
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static const int CAPACITY = ARG_CAPACITY;
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handle_pool_os() {}
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};
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template<class T, int ARG_CAPACITY, int ARG_MAX_CLASS_SIZE>
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class handle_pool_is : public handle_pool_base<storage::virtual_semantics<T,ARG_CAPACITY,ARG_MAX_CLASS_SIZE> >
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{
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public:
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typedef typename storage::virtual_semantics<T,ARG_CAPACITY,ARG_MAX_CLASS_SIZE> TStorageTraits;
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typedef typename TStorageTraits::TValue TTValue;
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static const int CAPACITY = ARG_CAPACITY;
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static const int MAX_CLASS_SIZE = ARG_MAX_CLASS_SIZE;
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handle_pool_is() {}
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};
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}
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#endif
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