Allow underwater units to have LoS and set it to originate in water h…

…eight

It allows underwater units to see ground units but it seems like it's the lesser of two evils with the current LoS system.

rts/Sim/Misc/LosHandler.cpp

@@ -112,7 +112,7 @@ float ILosType::GetHeight(const CUnit* unit) const
 		return 0.f;
 	}
 	const float emitHeight = (type == LOS_TYPE_LOS || type == LOS_TYPE_AIRLOS) ? unit->unitDef->losHeight : unit->unitDef->radarHeight;
-	const float losHeight  = unit->midPos.y + emitHeight;
+	const float losHeight  = std::max(unit->midPos.y + emitHeight, 0.0f);
 	const int bucketSize   = 1 << (mipLevel + 2);
 	const float iLosHeight = (int(losHeight) / bucketSize + 0.5f) * bucketSize; // save losHeight in buckets
 	return iLosHeight;

rts/Sim/Misc/LosMap.cpp

@@ -475,10 +475,6 @@ void CLosMap::LosAdd(SLosInstance* li) const
 		return ipos.y * mapDims.mapx + ipos.x;
 	};
 
-	// skip when unit is underground/underwater
-	if (li->baseHeight < 0.0f)
-		return;
-
 	const float* heightmapFull = readMap->GetCenterHeightMapSynced();
 	if (SRectangle(0,0,size.x,size.y).Inside(li->basePos) && li->baseHeight <= heightmapFull[MAP_SQUARE_FULLRES(li->basePos)])
 		return;