(Re)spawn players within 'mapgen_limit'

Previously, findSpawnPos() did not take the 'mapgen_limit' setting into account,
a small limit often resulted in a spawn out in the void.
Use the recently added 'calcMapgenEdges()' to get max spawn range through a new
mapgenParams function 'getSpawnRangeMax()'.

Previously, when a player respawned into a world, 'objectpos_over_limit()' was
used as a check, which was inaccurate.
Use the recently added 'saoPosOverLimit()' to get exact mapgen edges.

Also fix default value of 'm_sao_limit_min'.

1 files changed, 11 insertions, 3 deletions

diff --git a/src/mapgen.h b/src/mapgen.h
index 222838011..9bfdb22de 100644
--- a/src/mapgen.h
+++ b/src/mapgen.h
@@ -131,6 +131,9 @@ struct MapgenParams {
 
 	BiomeParams *bparams;
 
+	s16 mapgen_edge_min;
+	s16 mapgen_edge_max;
+
 	MapgenParams() :
 		mgtype(MAPGEN_DEFAULT),
 		chunksize(5),
@@ -139,9 +142,12 @@ struct MapgenParams {
 		mapgen_limit(MAX_MAP_GENERATION_LIMIT),
 		flags(MG_CAVES | MG_LIGHT | MG_DECORATIONS),
 		bparams(NULL),
-		m_sao_limit_min(MAX_MAP_GENERATION_LIMIT * BS),
+
+		mapgen_edge_min(-MAX_MAP_GENERATION_LIMIT),
+		mapgen_edge_max(MAX_MAP_GENERATION_LIMIT),
+		m_sao_limit_min(-MAX_MAP_GENERATION_LIMIT * BS),
 		m_sao_limit_max(MAX_MAP_GENERATION_LIMIT * BS),
-		m_sao_limit_calculated(false)
+		m_mapgen_edges_calculated(false)
 	{
 	}
 
@@ -151,12 +157,14 @@ struct MapgenParams {
 	virtual void writeParams(Settings *settings) const;
 
 	bool saoPosOverLimit(const v3f &p);
+	s32 getSpawnRangeMax();
+
 private:
 	void calcMapgenEdges();
 
 	float m_sao_limit_min;
 	float m_sao_limit_max;
-	bool m_sao_limit_calculated;
+	bool m_mapgen_edges_calculated;
 };