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more efficient tile collision testing?

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This commit is contained in:
Josh Deprez 2021-08-06 11:39:19 +10:00 committed by Josh Deprez
parent cb157a9503
commit 074b57f76d
1 changed files with 11 additions and 4 deletions
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15
engine/tiles.go
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@ -31,10 +31,17 @@ func (t *Tilemap) CollidesWith(r image.Rectangle) bool {
if t.Ersatz {
return false
}
// TODO: optimise?
for j, row := range t.Map {
for i, tile := range row {
if tile == nil {
// If we round down r.Min, and round up r.Max, to the nearest tile
// coordinates, that gives the full range of tiles to test.
sm1 := t.TileSize - 1
min := r.Min.Div(t.TileSize)
max := r.Max.Add(image.Pt(sm1, sm1)).Div(t.TileSize)
for j := min.Y; j <= max.Y && j < len(t.Map); j++ {
row := t.Map[j]
for i := min.X; i <= max.X && i < len(row); i++ {
if row[i] == nil {
continue
}
if r.Overlaps(image.Rect(i*t.TileSize, j*t.TileSize, (i+1)*t.TileSize, (j+1)*t.TileSize)) {