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Performance optimizations:

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1. Triangle rasterization: replaced loops over all the grid cells of the AABB with looping over the area of the triangle itself (i.e. bounds are set per row).
2. Region expansion: instead of sweeping through all the cells at each expandRegion() and finding the right level - sweep once per few levels and divide among several stacks. Left over are appended.
This commit is contained in:
axelrodR
2014-01-08 12:02:00 +02:00
parent b3d27bdb46
commit 8e4633c64b
2 changed files with 128 additions and 32 deletions
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19
Recast/Source/RecastRasterization.cpp
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@@ -95,7 +95,7 @@ static void addSpan(rcHeightfield& hf, const int x, const int y,
s->area = area;
s->next = 0;
// Empty cell, add he first span.
// Empty cell, add the first span.
if (!hf.spans[idx])
{
hf.spans[idx] = s;
@@ -222,14 +222,10 @@ static void rasterizeTri(const float* v0, const float* v1, const float* v2,
if (!overlapBounds(bmin, bmax, tmin, tmax))
return;
// Calculate the footpring of the triangle on the grid.
int x0 = (int)((tmin[0] - bmin[0])*ics);
// Calculate the footprint of the triangle on the grid's y-axis
int y0 = (int)((tmin[2] - bmin[2])*ics);
int x1 = (int)((tmax[0] - bmin[0])*ics);
int y1 = (int)((tmax[2] - bmin[2])*ics);
x0 = rcClamp(x0, 0, w-1);
y0 = rcClamp(y0, 0, h-1);
x1 = rcClamp(x1, 0, w-1);
y1 = rcClamp(y1, 0, h-1);
// Clip the triangle into all grid cells it touches.
@@ -248,6 +244,17 @@ static void rasterizeTri(const float* v0, const float* v1, const float* v2,
nvrow = clipPoly(out, nvrow, inrow, 0, -1, cz+cs);
if (nvrow < 3) continue;
float minX = inrow[0], maxX = inrow[0];
for (int i=1; i<nvrow; ++i)
{
if (minX > inrow[i*3]) minX = inrow[i*3];
if (maxX < inrow[i*3]) maxX = inrow[i*3];
}
int x0 = (int)((minX - bmin[0])*ics);
int x1 = (int)((maxX - bmin[0])*ics);
x0 = rcClamp(x0, 0, w-1);
x1 = rcClamp(x1, 0, w-1);
for (int x = x0; x <= x1; ++x)
{
// Clip polygon to column.