From 66e65898838e3d5d40dfb225fd6c34f0f354b2e3 Mon Sep 17 00:00:00 2001
From: Gargaj <gargaj@conspiracy.hu>
Date: Tue, 10 Nov 2015 14:02:07 +0100
Subject: blockheight mechanism

---
 src/Blocks/BlockHandler.cpp | 10 ++++++++++
 src/Blocks/BlockHandler.h   |  6 +++++-
 src/Blocks/BlockSlab.h      |  9 +++++++++
 src/Blocks/BlockSnow.h      |  5 +++++
 src/Blocks/BlockStairs.h    | 32 ++++++++++++++++++++++++++++++++
 5 files changed, 61 insertions(+), 1 deletion(-)

(limited to 'src/Blocks')

diff --git a/src/Blocks/BlockHandler.cpp b/src/Blocks/BlockHandler.cpp
index bb479db53..0ad0e2242 100644
--- a/src/Blocks/BlockHandler.cpp
+++ b/src/Blocks/BlockHandler.cpp
@@ -553,6 +553,16 @@ bool cBlockHandler::DoesDropOnUnsuitable(void)
 
 
 
+/* default functionality: only test for height, since we assume full voxels with varying height */
+bool cBlockHandler::IsInsideBlock(const Vector3d & a_Position, const BLOCKTYPE a_BlockType, const NIBBLETYPE a_BlockMeta)
+{
+	return a_Position.y < cBlockInfo::GetBlockHeight(a_BlockType);
+}
+
+
+
+
+
 void cBlockHandler::Check(cChunkInterface & a_ChunkInterface, cBlockPluginInterface & a_PluginInterface, int a_RelX, int a_RelY, int a_RelZ, cChunk & a_Chunk)
 {
 	if (!CanBeAt(a_ChunkInterface, a_RelX, a_RelY, a_RelZ, a_Chunk))
diff --git a/src/Blocks/BlockHandler.h b/src/Blocks/BlockHandler.h
index 4a7b76019..41fbc5140 100644
--- a/src/Blocks/BlockHandler.h
+++ b/src/Blocks/BlockHandler.h
@@ -124,7 +124,11 @@ public:
 	/** Returns if this block drops if it gets destroyed by an unsuitable situation.
 	Default: true */
 	virtual bool DoesDropOnUnsuitable(void);
-	
+
+	/** Tests if a_Position is inside the block where a_Position is relative to the origin of the block
+	Note that this is considered from a "top-down" perspective i.e. empty spaces on the bottom of a block don't matter */
+	virtual bool IsInsideBlock(const Vector3d & a_Position, const BLOCKTYPE a_BlockType, const NIBBLETYPE a_BlockMeta);
+
 	/** Called when one of the neighbors gets set; equivalent to MC block update.
 	By default drops if position no more suitable (CanBeAt(), DoesDropOnUnsuitable(), Drop()),
 	and wakes up all simulators on the block. */
diff --git a/src/Blocks/BlockSlab.h b/src/Blocks/BlockSlab.h
index 19b25595d..79d440cf6 100644
--- a/src/Blocks/BlockSlab.h
+++ b/src/Blocks/BlockSlab.h
@@ -174,6 +174,15 @@ public:
 			}
 		}
 	}
+
+	virtual bool IsInsideBlock(const Vector3d & a_Position, const BLOCKTYPE a_BlockType, const NIBBLETYPE a_BlockMeta) override
+	{
+		if (a_BlockMeta & 0x8)  // top half
+		{
+			return true;
+		}
+		return cBlockHandler::IsInsideBlock(a_Position, a_BlockType, a_BlockMeta);
+	}
 } ;
 
 
diff --git a/src/Blocks/BlockSnow.h b/src/Blocks/BlockSnow.h
index 3fab0b8ef..c49aa7161 100644
--- a/src/Blocks/BlockSnow.h
+++ b/src/Blocks/BlockSnow.h
@@ -88,6 +88,11 @@ public:
 		UNUSED(a_Meta);
 		return 14;
 	}
+
+	virtual bool IsInsideBlock(const Vector3d & a_Position, const BLOCKTYPE a_BlockType, const NIBBLETYPE a_BlockMeta) override
+	{
+		return a_Position.y < (cBlockInfo::GetBlockHeight(a_BlockType) * (a_BlockMeta & 7));
+	}
 } ;
 
 
diff --git a/src/Blocks/BlockStairs.h b/src/Blocks/BlockStairs.h
index 8a23fd064..3d7dd1442 100644
--- a/src/Blocks/BlockStairs.h
+++ b/src/Blocks/BlockStairs.h
@@ -115,6 +115,38 @@ public:
 			}
 		}
 	}
+
+	/** EXCEPTION a.k.a. why is this removed:
+	This collision-detection is actually more accurate than the client, but since the client itself
+	sends inaccurate / sparse data, it's easier to just err on the side of the client and keep the
+	two in sync by assuming that if a player hit ANY of the stair's bounding cube, it counts as the ground. */
+	#if 0
+	bool IsInsideBlock(const Vector3d & a_Position, const BLOCKTYPE a_BlockType, const NIBBLETYPE a_BlockMeta)
+	{
+		if (a_BlockMeta & 0x4)  // upside down
+		{
+			return true;
+		}
+		else if ((a_BlockMeta & 0x3) == 0)  // tall side is east (+X)
+		{
+			return a_Position.y < ((a_Position.x > 0.5) ? 1.0 : 0.5);
+		}
+		else if ((a_BlockMeta & 0x3) == 1)  // tall side is west (-X)
+		{
+			return a_Position.y < ((a_Position.x < 0.5) ? 1.0 : 0.5);
+		}
+		else if ((a_BlockMeta & 0x3) == 2)  // tall side is south (+Z)
+		{
+			return a_Position.y < ((a_Position.z > 0.5) ? 1.0 : 0.5);
+		}
+		else if ((a_BlockMeta & 0x3) == 3)  // tall side is north (-Z)
+		{
+			return a_Position.y < ((a_Position.z < 0.5) ? 1.0 : 0.5);
+		}
+		return false;
+	}
+	#endif
+
 } ;
 
 
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