1 files changed, 302 insertions, 0 deletions

diff --git a/source/Generating/HeiGen.cpp b/source/Generating/HeiGen.cpp
new file mode 100644
index 000000000..ed353751c
--- /dev/null
+++ b/source/Generating/HeiGen.cpp
@@ -0,0 +1,302 @@
+
+// HeiGen.cpp
+
+// Implements the various terrain height generators
+
+#include "Globals.h"
+#include "HeiGen.h"
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cHeiGenFlat:
+
+void cHeiGenFlat::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
+{
+	for (int i = 0; i < ARRAYCOUNT(a_HeightMap); i++)
+	{
+		a_HeightMap[i] = m_Height;
+	}
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cHeiGenCache:
+
+cHeiGenCache::cHeiGenCache(cTerrainHeightGen * a_HeiGenToCache, int a_CacheSize) :
+	m_HeiGenToCache(a_HeiGenToCache),
+	m_CacheSize(a_CacheSize),
+	m_CacheOrder(new int[a_CacheSize]),
+	m_CacheData(new sCacheData[a_CacheSize]),
+	m_NumHits(0),
+	m_NumMisses(0),
+	m_TotalChain(0)
+{
+	for (int i = 0; i < m_CacheSize; i++)
+	{
+		m_CacheOrder[i] = i;
+		m_CacheData[i].m_ChunkX = 0x7fffffff;
+		m_CacheData[i].m_ChunkZ = 0x7fffffff;
+	}
+}
+
+
+
+
+
+cHeiGenCache::~cHeiGenCache()
+{
+	delete m_CacheData;
+	delete m_CacheOrder;
+	delete m_HeiGenToCache;
+}
+
+
+
+
+
+void cHeiGenCache::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
+{
+	if (((m_NumHits + m_NumMisses) % 1024) == 10)
+	{
+		LOGD("HeiGenCache: %d hits, %d misses, saved %.2f %%", m_NumHits, m_NumMisses, 100.0 * m_NumHits / (m_NumHits + m_NumMisses));
+		LOGD("HeiGenCache: Avg cache chain length: %.2f", (float)m_TotalChain / m_NumHits);
+	}
+	
+	for (int i = 0; i < m_CacheSize; i++)
+	{
+		if (
+			(m_CacheData[m_CacheOrder[i]].m_ChunkX != a_ChunkX) ||
+			(m_CacheData[m_CacheOrder[i]].m_ChunkZ != a_ChunkZ)
+		)
+		{
+			continue;
+		}
+		// Found it in the cache
+		int Idx = m_CacheOrder[i];
+		
+		// Move to front:
+		for (int j = i; j > 0; j--)
+		{
+			m_CacheOrder[j] = m_CacheOrder[j - 1];
+		}
+		m_CacheOrder[0] = Idx;
+		
+		// Use the cached data:
+		memcpy(a_HeightMap, m_CacheData[Idx].m_HeightMap, sizeof(a_HeightMap));
+		
+		m_NumHits++;
+		m_TotalChain += i;
+		return;
+	}  // for i - cache
+	
+	// Not in the cache:
+	m_NumMisses++;
+	m_HeiGenToCache->GenHeightMap(a_ChunkX, a_ChunkZ, a_HeightMap);
+	
+	// Insert it as the first item in the MRU order:
+	int Idx = m_CacheOrder[m_CacheSize - 1];
+	for (int i = m_CacheSize - 1; i > 0; i--)
+	{
+		m_CacheOrder[i] = m_CacheOrder[i - 1];
+	}  // for i - m_CacheOrder[]
+	m_CacheOrder[0] = Idx;
+	memcpy(m_CacheData[Idx].m_HeightMap, a_HeightMap, sizeof(a_HeightMap));
+	m_CacheData[Idx].m_ChunkX = a_ChunkX;
+	m_CacheData[Idx].m_ChunkZ = a_ChunkZ;
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cHeiGenClassic:
+
+cHeiGenClassic::cHeiGenClassic(int a_Seed, float a_HeightFreq1, float a_HeightAmp1, float a_HeightFreq2, float a_HeightAmp2, float a_HeightFreq3, float a_HeightAmp3) :
+	m_Seed(a_Seed),
+	m_Noise(a_Seed),
+	m_HeightFreq1(a_HeightFreq1),
+	m_HeightAmp1 (a_HeightAmp1),
+	m_HeightFreq2(a_HeightFreq2),
+	m_HeightAmp2 (a_HeightAmp2),
+	m_HeightFreq3(a_HeightFreq3),
+	m_HeightAmp3 (a_HeightAmp3)
+{
+	// Nothing needed yet
+}
+
+
+
+
+
+float cHeiGenClassic::GetNoise(float x, float y)
+{
+	float oct1 = m_Noise.CubicNoise2D(x * m_HeightFreq1, y * m_HeightFreq1) * m_HeightAmp1;
+	float oct2 = m_Noise.CubicNoise2D(x * m_HeightFreq2, y * m_HeightFreq2) * m_HeightAmp2;
+	float oct3 = m_Noise.CubicNoise2D(x * m_HeightFreq3, y * m_HeightFreq3) * m_HeightAmp3;
+
+	float height = m_Noise.CubicNoise2D(x * 0.1f, y * 0.1f ) * 2;
+
+	float flatness = ((m_Noise.CubicNoise2D(x * 0.5f, y * 0.5f) + 1.f) * 0.5f) * 1.1f; // 0 ... 1.5
+	flatness *= flatness * flatness;
+
+	return (oct1 + oct2 + oct3) * flatness + height;
+}
+
+
+
+
+
+void cHeiGenClassic::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
+{
+	for (int z = 0; z < cChunkDef::Width; z++) 
+	{
+		const float zz = (float)(a_ChunkZ * cChunkDef::Width + z);
+		for (int x = 0; x < cChunkDef::Width; x++)
+		{
+			const float xx = (float)(a_ChunkX * cChunkDef::Width + x);
+			
+			int hei = 64 + (int)(GetNoise(xx * 0.05f, zz * 0.05f) * 16);
+			if (hei < 10)
+			{
+				hei = 10;
+			}
+			if (hei > 250)
+			{
+				hei = 250;
+			}
+			cChunkDef::SetHeight(a_HeightMap, x , z, hei);
+		}  // for x
+	}  // for z
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cHeiGenBiomal:
+
+const cHeiGenBiomal::sGenParam cHeiGenBiomal::m_GenParam[biNumBiomes] =
+{
+	/*                        Fast-changing | Middle-changing | Slow-changing |*/
+	/* Biome               |  Freq1  | Amp1 | Freq2   | Amp2  | Freq3  | Amp3 | BaseHeight */
+	/* biOcean            */ { 0.1f,   2.0f,  0.05f,    12.0f,  0.01f,   10.0f,  40},    // done
+	/* biPlains           */ { 0.1f,   1.0f,  0.05f,     1.5f,  0.01f,    4.0f,  68},    // done
+	/* biDesert           */ { 0.1f,   1.0f,  0.05f,     1.5f,  0.01f,    4.0f,  68},    // done
+	/* biExtremeHills     */ { 0.2f,   4.0f,  0.05f,    20.0f,  0.01f,   16.0f, 100},    // done
+	/* biForest           */ { 0.1f,   1.0f,  0.05f,     2.0f,  0.01f,    4.0f,  70},    // done
+	/* biTaiga            */ { 0.1f,   1.0f,  0.05f,     2.0f,  0.01f,    4.0f,  70},    // done
+	/* biSwampland        */ { 0.1f,   1.1f,  0.05f,     1.5f,  0.02f,    2.5f,  61.5},  // done
+	/* biRiver            */ { 0.2f,   3.0f,  0.05f,     1.0f,  0.01f,    1.0f,  56},    // done
+	/* biNether           */ { 0.1f,   0.0f,  0.01f,     0.0f,  0.01f,    0.0f,   0},  // Unused, but must be here due to indexing
+	/* biSky              */ { 0.1f,   0.0f,  0.01f,     0.0f,  0.01f,    0.0f,   0},  // Unused, but must be here due to indexing
+	/* biFrozenOcean      */ { 0.1f,   2.0f,  0.05f,    12.0f,  0.01f,   10.0f,  40},  // done
+	/* biFrozenRiver      */ { 0.2f,   3.0f,  0.05f,     1.0f,  0.01f,    1.0f,  56},  // done
+	/* biIcePlains        */ { 0.1f,   1.0f,  0.05f,     1.5f,  0.01f,    4.0f,  68},  // done
+	/* biIceMountains     */ { 0.2f,   2.0f,  0.05f,    10.0f,  0.01f,    8.0f,  80},  // done
+	/* biMushroomIsland   */ { 0.1f,   2.0f,  0.05f,     8.0f,  0.01f,    6.0f,  80},  // done
+	/* biMushroomShore    */ { 0.1f,   1.0f,  0.05f,     2.0f,  0.01f,    4.0f,  64},  // done
+	/* biBeach            */ { 0.1f,   0.5f,  0.05f,     1.0f,  0.01f,    1.0f,  64},  // done
+	/* biDesertHills      */ { 0.2f,   2.0f,  0.05f,     5.0f,  0.01f,    4.0f,  75},  // done
+	/* biForestHills      */ { 0.2f,   2.0f,  0.05f,    12.0f,  0.01f,   10.0f,  80},  // done
+	/* biTaigaHills       */ { 0.2f,   2.0f,  0.05f,    12.0f,  0.01f,   10.0f,  80},  // done
+	/* biExtremeHillsEdge */ { 0.2f,   3.0f,  0.05f,    16.0f,  0.01f,   12.0f,  80},  // done
+	/* biJungle           */ { 0.1f,   3.0f,  0.05f,     6.0f,  0.01f,    6.0f,  70},  // done
+	/* biJungleHills      */ { 0.2f,   3.0f,  0.05f,    12.0f,  0.01f,   10.0f,  80},  // done
+} ;
+
+
+
+
+
+void cHeiGenBiomal::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
+{
+	// Generate a 3x3 chunk area of biomes around this chunk:
+	BiomeNeighbors Biomes;
+	for (int z = -1; z <= 1; z++)
+	{
+		for (int x = -1; x <= 1; x++)
+		{
+			m_BiomeGen.GenBiomes(a_ChunkX + x, a_ChunkZ + z, Biomes[x + 1][z + 1]);
+		}  // for x
+	}  // for z
+	
+	// For each height, go through neighboring biomes and add up their idea of height:
+	for (int z = 0; z < cChunkDef::Width; z++)
+	{
+		for (int x = 0; x < cChunkDef::Width; x++)
+		{
+			cChunkDef::SetHeight(a_HeightMap, x, z, GetHeightAt(x, z, a_ChunkX, a_ChunkZ, Biomes));
+		}  // for x
+	}
+}
+
+
+
+
+
+HEIGHTTYPE cHeiGenBiomal::GetHeightAt(int a_RelX, int a_RelZ, int a_ChunkX, int a_ChunkZ, const cHeiGenBiomal::BiomeNeighbors & a_BiomeNeighbors)
+{
+	// Sum up how many biomes of each type there are in the neighborhood:
+	int BiomeCounts[biNumBiomes];
+	memset(BiomeCounts, 0, sizeof(BiomeCounts));
+	int Sum = 0;
+	for (int z = -8; z <= 8; z++)
+	{
+		int FinalZ = a_RelZ + z + cChunkDef::Width;
+		int IdxZ = FinalZ / cChunkDef::Width;
+		int ModZ = FinalZ % cChunkDef::Width;
+		int WeightZ = 9 - abs(z);
+		for (int x = -8; x <= 8; x++)
+		{
+			int FinalX = a_RelX + x + cChunkDef::Width;
+			int IdxX = FinalX / cChunkDef::Width;
+			int ModX = FinalX % cChunkDef::Width;
+			EMCSBiome Biome = cChunkDef::GetBiome(a_BiomeNeighbors[IdxX][IdxZ], ModX, ModZ);
+			if ((Biome < 0) || (Biome >= ARRAYCOUNT(BiomeCounts)))
+			{
+				continue;
+			}
+			int WeightX = 9 - abs(x);
+			BiomeCounts[Biome] += WeightX + WeightZ;
+			Sum += WeightX + WeightZ;
+		}  // for x
+	}  // for z
+	
+	// For each biome type that has a nonzero count, calc its height and add it:
+	if (Sum > 0)
+	{
+		int Height = 0;
+		int BlockX = a_ChunkX * cChunkDef::Width + a_RelX;
+		int BlockZ = a_ChunkZ * cChunkDef::Width + a_RelZ;
+		for (int i = 0; i < ARRAYCOUNT(BiomeCounts); i++)
+		{
+			if (BiomeCounts[i] == 0)
+			{
+				continue;
+			}
+			float oct1 = m_Noise.CubicNoise2D(BlockX * m_GenParam[i].m_HeightFreq1, BlockZ * m_GenParam[i].m_HeightFreq1) * m_GenParam[i].m_HeightAmp1;
+			float oct2 = m_Noise.CubicNoise2D(BlockX * m_GenParam[i].m_HeightFreq2, BlockZ * m_GenParam[i].m_HeightFreq2) * m_GenParam[i].m_HeightAmp2;
+			float oct3 = m_Noise.CubicNoise2D(BlockX * m_GenParam[i].m_HeightFreq3, BlockZ * m_GenParam[i].m_HeightFreq3) * m_GenParam[i].m_HeightAmp3;
+			Height += BiomeCounts[i] * (int)(m_GenParam[i].m_BaseHeight + oct1 + oct2 + oct3);
+		}
+		int res = (HEIGHTTYPE)(Height / Sum);
+		return std::min(250, std::max(res, 5));
+	}
+	
+	// No known biome around? Weird. Return a bogus value:
+	ASSERT(!"cHeiGenBiomal: Biome sum failed, no known biome around");
+	return 5;
+}
+
+
+
+
+