fixes:

- fixed bumpedge test for obstacles
- fixed obstacle crash when going to the south or east
- added wasm builder

grid/collider.go

@@ -5,6 +5,31 @@ import (
 	. "openquell/config"
 )
 
+// FIXME: make available everywhere
+func (grid *Grid) CheckGridCollision(
+	playerposition *components.Position,
+	velocity *components.Velocity) {
+
+	if velocity.Moving() {
+		ok, newpos := grid.BumpEdge(playerposition, velocity)
+		if ok {
+			//slog.Debug("falling off the edge", "newpos", newpos)
+			playerposition.Set(newpos)
+		} else {
+			ok, tilepos := grid.GetSolidNeighborPosition(playerposition, velocity, true)
+			if ok {
+				// slog.Debug("HaveSolidNeighbor", "ok", ok, "tilepos",
+				// 	tilepos.Point(), "playerpos", playerposition)
+				intersects, newpos := tilepos.Intersects(playerposition, velocity)
+				if intersects {
+					playerposition.Set(newpos)
+					velocity.Change(Stop)
+				}
+			}
+		}
+	}
+}
+
 func (grid *Grid) GetSolidNeighborPosition(
 	position *components.Position,
 	velocity *components.Velocity,