Biomes: Add 'min_pos'/'max_pos' xyz biome limits

'y_min' and 'y_max' are still accepted for compatibility.

1 files changed, 29 insertions, 19 deletions

diff --git a/src/mapgen/mg_biome.cpp b/src/mapgen/mg_biome.cpp
index eb12fcc73..38017ea9d 100644
--- a/src/mapgen/mg_biome.cpp
+++ b/src/mapgen/mg_biome.cpp
@@ -46,8 +46,10 @@ BiomeManager::BiomeManager(Server *server) :
 	b->depth_filler    = -MAX_MAP_GENERATION_LIMIT;
 	b->depth_water_top = 0;
 	b->depth_riverbed  = 0;
-	b->y_min           = -MAX_MAP_GENERATION_LIMIT;
-	b->y_max           = MAX_MAP_GENERATION_LIMIT;
+	b->min_pos         = v3s16(-MAX_MAP_GENERATION_LIMIT,
+			-MAX_MAP_GENERATION_LIMIT, -MAX_MAP_GENERATION_LIMIT);
+	b->max_pos         = v3s16(MAX_MAP_GENERATION_LIMIT,
+			MAX_MAP_GENERATION_LIMIT, MAX_MAP_GENERATION_LIMIT);
 	b->heat_point      = 0.0;
 	b->humidity_point  = 0.0;
 	b->vertical_blend  = 0;
@@ -106,7 +108,7 @@ float BiomeManager::getHumidityAtPosOriginal(v3s16 pos, NoiseParams &np_humidity
 
 
 // For BiomeGen type 'BiomeGenOriginal'
-Biome *BiomeManager::getBiomeFromNoiseOriginal(float heat, float humidity, s16 y)
+Biome *BiomeManager::getBiomeFromNoiseOriginal(float heat, float humidity, v3s16 pos)
 {
 	Biome *biome_closest = nullptr;
 	Biome *biome_closest_blend = nullptr;
@@ -115,14 +117,17 @@ Biome *BiomeManager::getBiomeFromNoiseOriginal(float heat, float humidity, s16 y
 
 	for (size_t i = 1; i < getNumObjects(); i++) {
 		Biome *b = (Biome *)getRaw(i);
-		if (!b || y > b->y_max + b->vertical_blend || y < b->y_min)
+		if (!b ||
+				pos.Y < b->min_pos.Y || pos.Y > b->max_pos.Y + b->vertical_blend ||
+				pos.X < b->min_pos.X || pos.X > b->max_pos.X ||
+				pos.Z < b->min_pos.Z || pos.Z > b->max_pos.Z)
 			continue;
 
 		float d_heat = heat - b->heat_point;
 		float d_humidity = humidity - b->humidity_point;
 		float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
 
-		if (y <= b->y_max) { // Within y limits of biome b
+		if (pos.Y <= b->max_pos.Y) { // Within y limits of biome b
 			if (dist < dist_min) {
 				dist_min = dist;
 				biome_closest = b;
@@ -133,10 +138,10 @@ Biome *BiomeManager::getBiomeFromNoiseOriginal(float heat, float humidity, s16 y
 		}
 	}
 
-	mysrand(y + (heat + humidity) / 2);
+	mysrand(pos.Y + (heat + humidity) / 2);
 	if (biome_closest_blend &&
 			myrand_range(0, biome_closest_blend->vertical_blend) >=
-			y - biome_closest_blend->y_max)
+			pos.Y - biome_closest_blend->max_pos.Y)
 		return biome_closest_blend;
 
 	return (biome_closest) ? biome_closest : (Biome *)getRaw(BIOME_NONE);
@@ -206,7 +211,7 @@ Biome *BiomeGenOriginal::calcBiomeAtPoint(v3s16 pos) const
 		NoisePerlin2D(&m_params->np_humidity,       pos.X, pos.Z, m_params->seed) +
 		NoisePerlin2D(&m_params->np_humidity_blend, pos.X, pos.Z, m_params->seed);
 
-	return calcBiomeFromNoise(heat, humidity, pos.Y);
+	return calcBiomeFromNoise(heat, humidity, pos);
 }
 
 
@@ -226,13 +231,15 @@ void BiomeGenOriginal::calcBiomeNoise(v3s16 pmin)
 }
 
 
-biome_t *BiomeGenOriginal::getBiomes(s16 *heightmap)
+biome_t *BiomeGenOriginal::getBiomes(s16 *heightmap, v3s16 pmin)
 {
-	for (s32 i = 0; i != m_csize.X * m_csize.Z; i++) {
+	for (s16 zr = 0; zr < m_csize.Z; zr++)
+	for (s16 xr = 0; xr < m_csize.X; xr++) {
+		s32 i = zr * m_csize.X + xr;
 		Biome *biome = calcBiomeFromNoise(
 			noise_heat->result[i],
 			noise_humidity->result[i],
-			heightmap[i]);
+			v3s16(pmin.X + xr, heightmap[i], pmin.Z + zr));
 
 		biomemap[i] = biome->index;
 	}
@@ -245,20 +252,20 @@ Biome *BiomeGenOriginal::getBiomeAtPoint(v3s16 pos) const
 {
 	return getBiomeAtIndex(
 		(pos.Z - m_pmin.Z) * m_csize.X + (pos.X - m_pmin.X),
-		pos.Y);
+		pos);
 }
 
 
-Biome *BiomeGenOriginal::getBiomeAtIndex(size_t index, s16 y) const
+Biome *BiomeGenOriginal::getBiomeAtIndex(size_t index, v3s16 pos) const
 {
 	return calcBiomeFromNoise(
 		noise_heat->result[index],
 		noise_humidity->result[index],
-		y);
+		pos);
 }
 
 
-Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, s16 y) const
+Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, v3s16 pos) const
 {
 	Biome *biome_closest = nullptr;
 	Biome *biome_closest_blend = nullptr;
@@ -267,14 +274,17 @@ Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, s16 y) c
 
 	for (size_t i = 1; i < m_bmgr->getNumObjects(); i++) {
 		Biome *b = (Biome *)m_bmgr->getRaw(i);
-		if (!b || y > b->y_max + b->vertical_blend || y < b->y_min)
+		if (!b ||
+				pos.Y < b->min_pos.Y || pos.Y > b->max_pos.Y + b->vertical_blend ||
+				pos.X < b->min_pos.X || pos.X > b->max_pos.X ||
+				pos.Z < b->min_pos.Z || pos.Z > b->max_pos.Z)
 			continue;
 
 		float d_heat = heat - b->heat_point;
 		float d_humidity = humidity - b->humidity_point;
 		float dist = (d_heat * d_heat) + (d_humidity * d_humidity);
 
-		if (y <= b->y_max) { // Within y limits of biome b
+		if (pos.Y <= b->max_pos.Y) { // Within y limits of biome b
 			if (dist < dist_min) {
 				dist_min = dist;
 				biome_closest = b;
@@ -288,11 +298,11 @@ Biome *BiomeGenOriginal::calcBiomeFromNoise(float heat, float humidity, s16 y) c
 	// Carefully tune pseudorandom seed variation to avoid single node dither
 	// and create larger scale blending patterns similar to horizontal biome
 	// blend.
-	mysrand(y + (heat + humidity) / 2);
+	mysrand(pos.Y + (heat + humidity) / 2);
 
 	if (biome_closest_blend &&
 			myrand_range(0, biome_closest_blend->vertical_blend) >=
-			y - biome_closest_blend->y_max)
+			pos.Y - biome_closest_blend->max_pos.Y)
 		return biome_closest_blend;
 
 	return (biome_closest) ? biome_closest : (Biome *)m_bmgr->getRaw(BIOME_NONE);