From 76f485647983ebd7eb4c3abbca0869d13f76920b Mon Sep 17 00:00:00 2001
From: kwolekr <kwolekr@minetest.net>
Date: Thu, 28 Apr 2016 03:43:09 -0400
Subject: Move biome calculation to BiomeGen

BiomeGen defines an interface that, given a set of BiomeParams, computes biomes
for a given area using the algorithm implemented by that specific BiomeGen.
This abstracts away the old system where each mapgen supplied the noises
required for biome generation.
---
 src/mapgen_v5.cpp | 46 ++++++++++++----------------------------------
 1 file changed, 12 insertions(+), 34 deletions(-)

(limited to 'src/mapgen_v5.cpp')

diff --git a/src/mapgen_v5.cpp b/src/mapgen_v5.cpp
index b98acb928..829a1f432 100644
--- a/src/mapgen_v5.cpp
+++ b/src/mapgen_v5.cpp
@@ -57,10 +57,7 @@ MapgenV5::MapgenV5(int mapgenid, MapgenParams *params, EmergeManager *emerge)
 	// 1-down overgeneration
 	this->zstride_1d = csize.X * (csize.Y + 1);
 
-	this->biomemap  = new u8[csize.X * csize.Z];
 	this->heightmap = new s16[csize.X * csize.Z];
-	this->heatmap   = NULL;
-	this->humidmap  = NULL;
 
 	MapgenV5Params *sp = (MapgenV5Params *)params->sparams;
 
@@ -79,15 +76,12 @@ MapgenV5::MapgenV5(int mapgenid, MapgenParams *params, EmergeManager *emerge)
 	noise_cave1  = new Noise(&sp->np_cave1,  seed, csize.X, csize.Y + 1, csize.Z);
 	noise_cave2  = new Noise(&sp->np_cave2,  seed, csize.X, csize.Y + 1, csize.Z);
 
-	// Biome noise
-	noise_heat           = new Noise(&params->np_biome_heat,           seed, csize.X, csize.Z);
-	noise_humidity       = new Noise(&params->np_biome_humidity,       seed, csize.X, csize.Z);
-	noise_heat_blend     = new Noise(&params->np_biome_heat_blend,     seed, csize.X, csize.Z);
-	noise_humidity_blend = new Noise(&params->np_biome_humidity_blend, seed, csize.X, csize.Z);
+	//// Initialize biome generator
+	biomegen = emerge->biomemgr->createBiomeGen(
+		BIOMEGEN_ORIGINAL, params->bparams, csize);
+	biomemap = biomegen->biomemap;
 
 	//// Resolve nodes to be used
-	INodeDefManager *ndef = emerge->ndef;
-
 	c_stone                = ndef->getId("mapgen_stone");
 	c_water_source         = ndef->getId("mapgen_water_source");
 	c_lava_source          = ndef->getId("mapgen_lava_source");
@@ -123,13 +117,9 @@ MapgenV5::~MapgenV5()
 	delete noise_cave2;
 	delete noise_ground;
 
-	delete noise_heat;
-	delete noise_humidity;
-	delete noise_heat_blend;
-	delete noise_humidity_blend;
+	delete biomegen;
 
 	delete[] heightmap;
-	delete[] biomemap;
 }
 
 
@@ -248,12 +238,10 @@ void MapgenV5::makeChunk(BlockMakeData *data)
 	// Create heightmap
 	updateHeightmap(node_min, node_max);
 
-	// Create biomemap at heightmap surface
-	bmgr->calcBiomes(csize.X, csize.Z, noise_heat->result,
-		noise_humidity->result, heightmap, biomemap);
-
-	// Actually place the biome-specific nodes
-	MgStoneType stone_type = generateBiomes(noise_heat->result, noise_humidity->result);
+	// Init biome generator, place biome-specific nodes, and build biomemap
+	biomegen->calcBiomeNoise(node_min);
+	biomegen->getBiomes(heightmap);
+	MgStoneType stone_type = generateBiomes();
 
 	// Generate caves
 	if ((flags & MG_CAVES) && (stone_surface_max_y >= node_min.Y))
@@ -343,18 +331,7 @@ void MapgenV5::calculateNoise()
 	// only if solid terrain is present in mapchunk
 
 	noise_filler_depth->perlinMap2D(x, z);
-	noise_heat->perlinMap2D(x, z);
-	noise_humidity->perlinMap2D(x, z);
-	noise_heat_blend->perlinMap2D(x, z);
-	noise_humidity_blend->perlinMap2D(x, z);
-
-	for (s32 i = 0; i < csize.X * csize.Z; i++) {
-		noise_heat->result[i] += noise_heat_blend->result[i];
-		noise_humidity->result[i] += noise_humidity_blend->result[i];
-	}
 
-	heatmap = noise_heat->result;
-	humidmap = noise_humidity->result;
 	//printf("calculateNoise: %dus\n", t.stop());
 }
 
@@ -416,7 +393,7 @@ int MapgenV5::generateBaseTerrain()
 }
 
 
-MgStoneType MapgenV5::generateBiomes(float *heat_map, float *humidity_map)
+MgStoneType MapgenV5::generateBiomes()
 {
 	v3s16 em = vm->m_area.getExtent();
 	u32 index = 0;
@@ -452,7 +429,8 @@ MgStoneType MapgenV5::generateBiomes(float *heat_map, float *humidity_map)
 			// 3. When stone or water is detected but biome has not yet been calculated.
 			if ((c == c_stone && (air_above || water_above || !biome)) ||
 					(c == c_water_source && (air_above || !biome))) {
-				biome = bmgr->getBiome(heat_map[index], humidity_map[index], y);
+				biome = biomegen->getBiomeAtIndex(index, y);
+
 				depth_top = biome->depth_top;
 				base_filler = MYMAX(depth_top + biome->depth_filler
 						+ noise_filler_depth->result[index], 0);
-- 
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