From 47f7727b7f37972374dea1a7e0da67b7aff9782f Mon Sep 17 00:00:00 2001
From: 12xx12 <44411062+12xx12@users.noreply.github.com>
Date: Wed, 12 Aug 2020 09:20:38 +0200
Subject: Add enhanced Gold generation in Mesa-Type Biomes (#4821)

* added enhanced gold generation in mesa-type-biomes

* fixed typo in comment

* added enhanced gold generation in mesa biomes - fixed small checkstyle errors

Co-authored-by: 12xx12 <12xx12100@gmail.com>
---
 Server/Plugins/APIDump/APIDesc.lua | 17 +++++++++++++++++
 src/BiomeDef.cpp                   | 24 ++++++++++++++++++++++++
 src/BiomeDef.h                     |  3 +++
 src/Generating/FinishGen.cpp       | 21 +++++++++++++++++++++
 4 files changed, 65 insertions(+)

diff --git a/Server/Plugins/APIDump/APIDesc.lua b/Server/Plugins/APIDump/APIDesc.lua
index dd88eb7c5..e352f35a2 100644
--- a/Server/Plugins/APIDump/APIDesc.lua
+++ b/Server/Plugins/APIDump/APIDesc.lua
@@ -13647,6 +13647,23 @@ end
 					},
 					Notes = "Returns true if the biome is mountainous (mutations of the extreme hills biome)."
 				},
+				IsBiomeMesa =
+				{
+					Params =
+					{
+						{
+							Name = "Biome",
+							Type = "EMCSBiome",
+						}
+					},
+					Returns =
+					{
+						{
+							Type = "boolean",
+						},
+					},
+					Notes = "Returns true if the biome is type of Mesa (mutations of the Mesa biome)."
+				},
 				IsValidBlock =
 				{
 					Params =
diff --git a/src/BiomeDef.cpp b/src/BiomeDef.cpp
index ebb45f5e9..f56d9c815 100644
--- a/src/BiomeDef.cpp
+++ b/src/BiomeDef.cpp
@@ -246,6 +246,30 @@ bool IsBiomeMountain(EMCSBiome a_Biome)
 
 
 
+bool IsBiomeMesa(EMCSBiome a_Biome)
+{
+	switch (a_Biome)
+	{
+		case biMesa:
+		case biMesaPlateauF:
+		case biMesaPlateau:
+		case biMesaBryce:
+		case biMesaPlateauFM:
+		case biMesaPlateauM:
+		{
+			return true;
+		}
+		default:
+		{
+			return false;
+		}
+	}
+}
+
+
+
+
+
 int GetSnowStartHeight(EMCSBiome a_Biome)
 {
 	switch (a_Biome)
diff --git a/src/BiomeDef.h b/src/BiomeDef.h
index 888e3bb19..f8dea3e9f 100644
--- a/src/BiomeDef.h
+++ b/src/BiomeDef.h
@@ -154,6 +154,9 @@ extern bool IsBiomeCold(EMCSBiome a_Biome);
 /** Returns true if the biome is mountainous (mutations of the extreme hills biome) */
 extern bool IsBiomeMountain(EMCSBiome a_Biome);
 
+/** Returns true if the biome is Mesa or one of its mutations. */
+extern bool IsBiomeMesa(EMCSBiome a_Biome);
+
 /** Returns the height when a biome when a biome starts snowing. */
 extern int GetSnowStartHeight(EMCSBiome a_Biome);
 
diff --git a/src/Generating/FinishGen.cpp b/src/Generating/FinishGen.cpp
index 90c3e6ea4..f9315333b 100644
--- a/src/Generating/FinishGen.cpp
+++ b/src/Generating/FinishGen.cpp
@@ -1769,6 +1769,27 @@ void cFinishGenOreNests::GenerateOre(
 		}
 	}
 
+	// Gold ores are generated more often in Mesa-Type-Biomes:
+	// https://minecraft.gamepedia.com/Gold_Ore
+	if (a_OreType == E_BLOCK_GOLD_ORE)
+	{
+		auto BiomeSampleOne =    a_ChunkDesc.GetBiome( 4,  4);
+		auto BiomeSampleTwo =    a_ChunkDesc.GetBiome( 4, 12);
+		auto BiomeSampleThree =  a_ChunkDesc.GetBiome(12,  4);
+		auto BiomeSampleFour =   a_ChunkDesc.GetBiome(12, 12);
+
+		if (
+			IsBiomeMesa(BiomeSampleOne) ||
+			IsBiomeMesa(BiomeSampleTwo) ||
+			IsBiomeMesa(BiomeSampleThree) ||
+			IsBiomeMesa(BiomeSampleFour)
+			)
+		{
+			a_MaxHeight = 76;
+			a_NumNests = 22;  // 2 time default + 20 times mesa bonus
+		}
+	}
+
 	auto chunkX = a_ChunkDesc.GetChunkX();
 	auto chunkZ = a_ChunkDesc.GetChunkZ();
 	auto & blockTypes = a_ChunkDesc.GetBlockTypes();
-- 
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