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Changed to use Span<byte> and stackalloc for improved performance and memory management in `RcLayers.BuildHeightfieldLayers()`

This commit is contained in:
ikpil 2024-06-27 14:04:30 +09:00
parent 27751522f9
commit ba6815769a
2 changed files with 13 additions and 14 deletions
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3
CHANGELOG.md
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@ -18,7 +18,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
- Changed `reg`, `area` arrays to byte arrays for uniformity and efficiency in `DtTileCacheContour`
- Changed `RcChunkyTriMesh` to separate the function and variable.
- Changed to consolidate vector-related functions into one place.
- Changed stack handling from List to a fixed-size array with manual index management for optimization in `RcLayers.BuildHeightfieldLayers`
- Changed stack handling from List to a fixed-size array with manual index management for optimization in `RcLayers.BuildHeightfieldLayers()`
- Changed to use Span<byte> and stackalloc for improved performance and memory management in `RcLayers.BuildHeightfieldLayers()`
### Removed
- Removed RcMeshDetails.VdistSq2(float[], float[])

24
src/DotRecast.Recast/RcLayers.cs
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@ -25,7 +25,6 @@ using DotRecast.Core.Numerics;
namespace DotRecast.Recast
{
using static RcRecast;
public static class RcLayers
@ -61,7 +60,6 @@ namespace DotRecast.Recast
/// @name Layer, Contour, Polymesh, and Detail Mesh Functions
/// @see rcHeightfieldLayer, rcContourSet, rcPolyMesh, rcPolyMeshDetail
/// @{
/// Builds a layer set from the specified compact heightfield.
/// @ingroup recast
/// @param[in,out] ctx The build context to use during the operation.
@ -79,10 +77,10 @@ namespace DotRecast.Recast
int w = chf.width;
int h = chf.height;
byte[] srcReg = new byte[chf.spanCount];
Array.Fill(srcReg, (byte)0xFF);
Span<byte> srcReg = stackalloc byte[chf.spanCount];
srcReg.Fill(0xFF);
int nsweeps = chf.width;
RcLayerSweepSpan[] sweeps = new RcLayerSweepSpan[nsweeps];
for (int i = 0; i < sweeps.Length; i++)
@ -91,14 +89,14 @@ namespace DotRecast.Recast
}
// Partition walkable area into monotone regions.
int[] prevCount = new int[256];
Span<int> prevCount = stackalloc int[256];
byte regId = 0;
// Sweep one line at a time.
for (int y = borderSize; y < h - borderSize; ++y)
{
// Collect spans from this row.
Array.Fill(prevCount, 0);
prevCount.Fill(0);
byte sweepId = 0;
for (int x = borderSize; x < w - borderSize; ++x)
@ -110,9 +108,9 @@ namespace DotRecast.Recast
ref RcCompactSpan s = ref chf.spans[i];
if (chf.areas[i] == RC_NULL_AREA)
continue;
byte sid = 0xFF;
// -x
if (GetCon(ref s, 0) != RC_NOT_CONNECTED)
{
@ -292,7 +290,7 @@ namespace DotRecast.Recast
RcLayerRegion reg = regs[stack[0]];
nstack--;
for (int j = 0; j < nstack; ++j)
stack[j] = stack[j+1];
stack[j] = stack[j + 1];
foreach (int nei in reg.neis)
{
@ -457,7 +455,7 @@ namespace DotRecast.Recast
bmin.Z += borderSize * chf.cs;
bmax.X -= borderSize * chf.cs;
bmax.Z -= borderSize * chf.cs;
lset = new RcHeightfieldLayerSet();
lset.layers = new RcHeightfieldLayer[layerId];
for (int i = 0; i < lset.layers.Length; i++)