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Made FAST_FLOOR_DIV work correctly, replaced all floorf() divisions with it. 

Still not perfect - chunk and region calculations can be made into a single CPU instruction - SAR - but not all compilers are known to support that (">>" operator on signed datatypes needs to perform arithmetic shift, C/C++ standard makes it implementation-specific; MSVC and GCC do what we need, LLVM unknown)

git-svn-id: http://mc-server.googlecode.com/svn/trunk@1224 0a769ca7-a7f5-676a-18bf-c427514a06d6
This commit is contained in:
madmaxoft@gmail.com 2013-02-27 10:01:20 +00:00
parent 24d3d5dac4
commit 71cd0199fd
5 changed files with 14 additions and 12 deletions
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10
source/ChunkMap.cpp
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@ -87,8 +87,8 @@ cChunkMap::cChunkLayer * cChunkMap::GetLayer(int a_LayerX, int a_LayerZ)
cChunkMap::cChunkLayer * cChunkMap::FindLayerForChunk(int a_ChunkX, int a_ChunkZ)
{
const int LayerX = (int)(floorf((float)a_ChunkX / (float)(LAYER_SIZE)));
const int LayerZ = (int)(floorf((float)a_ChunkZ / (float)(LAYER_SIZE)));
const int LayerX = FAST_FLOOR_DIV(a_ChunkX, LAYER_SIZE);
const int LayerZ = FAST_FLOOR_DIV(a_ChunkZ, LAYER_SIZE);
return FindLayer(LayerX, LayerZ);
}
@ -118,9 +118,9 @@ cChunkMap::cChunkLayer * cChunkMap::FindLayer(int a_LayerX, int a_LayerZ)
cChunkMap::cChunkLayer * cChunkMap::GetLayerForChunk(int a_ChunkX, int a_ChunkZ)
{
const int LayerX = (int)(floorf((float)a_ChunkX / (float)(LAYER_SIZE)));
const int LayerZ = (int)(floorf((float)a_ChunkZ / (float)(LAYER_SIZE)));
return GetLayer( LayerX, LayerZ );
const int LayerX = FAST_FLOOR_DIV(a_ChunkX, LAYER_SIZE);
const int LayerZ = FAST_FLOOR_DIV(a_ChunkX, LAYER_SIZE);
return GetLayer(LayerX, LayerZ);
}

4
source/ClientHandle.cpp
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@ -276,8 +276,8 @@ void cClientHandle::StreamChunks(void)
ASSERT(m_Player != NULL);
int ChunkPosX = FAST_FLOOR_DIV(m_Player->GetPosX(), cChunkDef::Width);
int ChunkPosZ = FAST_FLOOR_DIV(m_Player->GetPosZ(), cChunkDef::Width);
int ChunkPosX = FAST_FLOOR_DIV((int)m_Player->GetPosX(), cChunkDef::Width);
int ChunkPosZ = FAST_FLOOR_DIV((int)m_Player->GetPosZ(), cChunkDef::Width);
if ((ChunkPosX == m_LastStreamedChunkX) && (ChunkPosZ == m_LastStreamedChunkZ))
{
// Already streamed for this position

3
source/Globals.h
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@ -189,9 +189,10 @@ typedef unsigned short UInt16;
/// Allows arithmetic expressions like "32 KiB" (but consider using parenthesis around it, "(32 KiB)" )
#define KiB * 1024
#define MiB * 1024 * 1024
/// Faster than (int)floorf((float)x / (float)div)
#define FAST_FLOOR_DIV( x, div ) ( (x) < 0 ? (((int)x / div) - 1) : ((int)x / div) )
#define FAST_FLOOR_DIV( x, div ) (((x) - (((x) < 0) ? ((div) - 1) : 0)) / (div))
// Own version of assert() that writes failed assertions to the log for review
#ifdef _DEBUG

5
source/WorldStorage/WSSAnvil.cpp
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@ -388,9 +388,10 @@ bool cWSSAnvil::SetChunkData(const cChunkCoords & a_Chunk, const AString & a_Dat
cWSSAnvil::cMCAFile * cWSSAnvil::LoadMCAFile(const cChunkCoords & a_Chunk)
{
// ASSUME m_CS is locked
ASSERT(m_CS.IsLocked());
const int RegionX = (int)(floorf((float)a_Chunk.m_ChunkX / 32.0f));
const int RegionZ = (int)(floorf((float)a_Chunk.m_ChunkZ / 32.0f));
const int RegionX = FAST_FLOOR_DIV(a_Chunk.m_ChunkX, 32);
const int RegionZ = FAST_FLOOR_DIV(a_Chunk.m_ChunkZ, 32);
// Is it already cached?
for (cMCAFiles::iterator itr = m_Files.begin(); itr != m_Files.end(); ++itr)

4
source/WorldStorage/WSSCompact.cpp
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@ -171,8 +171,8 @@ cWSSCompact::cPAKFile * cWSSCompact::LoadPAKFile(const cChunkCoords & a_Chunk)
// ASSUMES that m_CS has been locked
// We need to retain this weird conversion code, because some edge chunks are in the wrong PAK file
const int LayerX = (int)(floorf((float)a_Chunk.m_ChunkX / 32.0f));
const int LayerZ = (int)(floorf((float)a_Chunk.m_ChunkZ / 32.0f));
const int LayerX = FAST_FLOOR_DIV(a_Chunk.m_ChunkX, 32);
const int LayerZ = FAST_FLOOR_DIV(a_Chunk.m_ChunkZ, 32);
// Is it already cached?
for (cPAKFiles::iterator itr = m_PAKFiles.begin(); itr != m_PAKFiles.end(); ++itr)