From 4e249fb3fbf75f0359758760d88e22aa5b14533c Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Sat, 27 Nov 2010 01:02:21 +0200
Subject: Initial files

---
 src/heightmap.h | 556 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 556 insertions(+)
 create mode 100644 src/heightmap.h

(limited to 'src/heightmap.h')

diff --git a/src/heightmap.h b/src/heightmap.h
new file mode 100644
index 000000000..a5da092aa
--- /dev/null
+++ b/src/heightmap.h
@@ -0,0 +1,556 @@
+/*
+(c) 2010 Perttu Ahola <celeron55@gmail.com>
+*/
+
+#ifndef HEIGHTMAP_HEADER
+#define HEIGHTMAP_HEADER
+
+#include <iostream>
+#include <time.h>
+#include <sstream>
+
+#include "debug.h"
+#include "common_irrlicht.h"
+#include "exceptions.h"
+#include "utility.h"
+#include "serialization.h"
+
+#define GROUNDHEIGHT_NOTFOUND_SETVALUE (-10e6)
+#define GROUNDHEIGHT_VALID_MINVALUE    ( -9e6)
+
+class Heightmappish
+{
+public:
+	virtual f32 getGroundHeight(v2s16 p, bool generate=true) = 0;
+	virtual void setGroundHeight(v2s16 p, f32 y, bool generate=true) = 0;
+	
+	v2f32 getSlope(v2s16 p)
+	{
+		f32 y0 = getGroundHeight(p, false);
+
+		v2s16 dirs[] = {
+			v2s16(1,0),
+			v2s16(0,1),
+		};
+
+		v2f32 fdirs[] = {
+			v2f32(1,0),
+			v2f32(0,1),
+		};
+
+		v2f32 slopevector(0.0, 0.0);
+		
+		for(u16 i=0; i<2; i++){
+			f32 y1 = 0.0;
+			f32 y2 = 0.0;
+			f32 count = 0.0;
+
+			v2s16 p1 = p - dirs[i];
+			y1 = getGroundHeight(p1, false);
+			if(y1 > GROUNDHEIGHT_VALID_MINVALUE){
+				y1 -= y0;
+				count += 1.0;
+			}
+			else
+				y1 = 0;
+
+			v2s16 p2 = p + dirs[i];
+			y2 = getGroundHeight(p2, false);
+			if(y2 > GROUNDHEIGHT_VALID_MINVALUE){
+				y2 -= y0;
+				count += 1.0;
+			}
+			else
+				y2 = 0;
+
+			if(count < 0.001)
+				return v2f32(0.0, 0.0);
+			
+			/*
+				If y2 is higher than y1, slope is positive
+			*/
+			f32 slope = (y2 - y1)/count;
+
+			slopevector += fdirs[i] * slope;
+		}
+
+		return slopevector;
+	}
+
+};
+
+// TODO: Get rid of this dummy wrapper
+class Heightmap : public Heightmappish /*, public ReferenceCounted*/
+{
+};
+
+class WrapperHeightmap : public Heightmap
+{
+	Heightmappish *m_target;
+public:
+
+	WrapperHeightmap(Heightmappish *target):
+		m_target(target)
+	{
+		if(target == NULL)
+			throw NullPointerException();
+	}
+
+	f32 getGroundHeight(v2s16 p, bool generate=true)
+	{
+		return m_target->getGroundHeight(p, generate);
+	}
+	void setGroundHeight(v2s16 p, f32 y, bool generate=true)
+	{
+		m_target->setGroundHeight(p, y, generate);
+	}
+};
+
+/*
+	Base class that defines a generator that gives out values at
+	positions in 2-dimensional space.
+	Can be given to UnlimitedHeightmap to feed stuff.
+
+	These are always serialized as readable text ending in "\n"
+*/
+class ValueGenerator
+{
+public:
+	ValueGenerator(){}
+	virtual ~ValueGenerator(){}
+	
+	static ValueGenerator* deSerialize(std::string line);
+	
+	static ValueGenerator* deSerialize(std::istream &is)
+	{
+		std::string line;
+		std::getline(is, line, '\n');
+		return deSerialize(line);
+	}
+	
+	void serializeBase(std::ostream &os)
+	{
+		os<<getName()<<" ";
+	}
+
+	// Virtual methods
+	virtual const char * getName() const = 0;
+	virtual f32 getValue(v2s16 p) = 0;
+	virtual void serialize(std::ostream &os) = 0;
+};
+
+class ConstantGenerator : public ValueGenerator
+{
+public:
+	f32 m_value;
+
+	ConstantGenerator(f32 value)
+	{
+		m_value = value;
+	}
+
+	const char * getName() const
+	{
+		return "constant";
+	}
+	
+	f32 getValue(v2s16 p)
+	{
+		return m_value;
+	}
+
+	void serialize(std::ostream &os)
+	{
+		serializeBase(os);
+
+		std::ostringstream ss;
+		//ss.imbue(std::locale("C"));
+
+		ss<<m_value<<"\n";
+
+		os<<ss.str();
+	}
+};
+
+class LinearGenerator : public ValueGenerator
+{
+public:
+	f32 m_height;
+	v2f m_slope;
+
+	LinearGenerator(f32 height, v2f slope)
+	{
+		m_height = height;
+		m_slope = slope;
+	}
+
+	const char * getName() const
+	{
+		return "linear";
+	}
+	
+	f32 getValue(v2s16 p)
+	{
+		return m_height + m_slope.X * p.X + m_slope.Y * p.Y;
+	}
+
+	void serialize(std::ostream &os)
+	{
+		serializeBase(os);
+
+		std::ostringstream ss;
+		//ss.imbue(std::locale("C"));
+
+		ss<<m_height<<" "<<m_slope.X<<" "<<m_slope.Y<<"\n";
+
+		os<<ss.str();
+	}
+};
+
+class PowerGenerator : public ValueGenerator
+{
+public:
+	f32 m_height;
+	v2f m_slope;
+	f32 m_power;
+
+	PowerGenerator(f32 height, v2f slope, f32 power)
+	{
+		m_height = height;
+		m_slope = slope;
+		m_power = power;
+	}
+
+	const char * getName() const
+	{
+		return "power";
+	}
+	
+	f32 getValue(v2s16 p)
+	{
+		return m_height
+				+ m_slope.X * pow((f32)p.X, m_power)
+				+ m_slope.Y * pow((f32)p.Y, m_power);
+	}
+
+	void serialize(std::ostream &os)
+	{
+		serializeBase(os);
+
+		std::ostringstream ss;
+		//ss.imbue(std::locale("C"));
+
+		ss<<m_height<<" "
+			<<m_slope.X<<" "
+			<<m_slope.Y<<" "
+			<<m_power<<"\n";
+
+		os<<ss.str();
+	}
+};
+
+class FixedHeightmap : public Heightmap
+{
+	// A meta-heightmap on which this heightmap is located
+	// (at m_pos_on_master * m_blocksize)
+	Heightmap * m_master;
+	// Position on master heightmap (in blocks)
+	v2s16 m_pos_on_master;
+	s32 m_blocksize; // This is (W-1) = (H-1)
+	// These are the actual size of the data
+	s32 W;
+	s32 H;
+	f32 *m_data;
+
+public:
+
+	FixedHeightmap(Heightmap * master,
+			v2s16 pos_on_master, s32 blocksize):
+		m_master(master),
+		m_pos_on_master(pos_on_master),
+		m_blocksize(blocksize)
+	{
+		W = m_blocksize+1;
+		H = m_blocksize+1;
+		m_data = NULL;
+		m_data = new f32[(blocksize+1)*(blocksize+1)];
+
+		for(s32 i=0; i<(blocksize+1)*(blocksize+1); i++){
+			m_data[i] = GROUNDHEIGHT_NOTFOUND_SETVALUE;
+		}
+	}
+
+	~FixedHeightmap()
+	{
+		if(m_data)
+			delete[] m_data;
+	}
+
+	v2s16 getPosOnMaster()
+	{
+		return m_pos_on_master;
+	}
+
+	/*
+		TODO: BorderWrapper class or something to allow defining
+		borders that wrap to an another heightmap. The algorithm
+		should be allowed to edit stuff over the border and on
+		the border in that case, too.
+		This will allow non-square heightmaps, too. (probably)
+	*/
+
+	void print()
+	{
+		printf("FixedHeightmap::print(): size is %ix%i\n", W, H);
+		for(s32 y=0; y<H; y++){
+			for(s32 x=0; x<W; x++){
+				/*if(getSeeded(v2s16(x,y)))
+					printf("S");*/
+				f32 n = getGroundHeight(v2s16(x,y));
+				if(n < GROUNDHEIGHT_VALID_MINVALUE)
+					printf("  -   ");
+				else
+					printf("% -5.1f ", getGroundHeight(v2s16(x,y)));
+			}
+			printf("\n");
+		}
+	}
+	
+	bool overborder(v2s16 p)
+	{
+		return (p.X < 0 || p.X >= W || p.Y < 0 || p.Y >= H);
+	}
+
+	bool atborder(v2s16 p)
+	{
+		if(overborder(p))
+			return false;
+		return (p.X == 0 || p.X == W-1 || p.Y == 0 || p.Y == H-1);
+	}
+
+	void setGroundHeight(v2s16 p, f32 y, bool generate=false)
+	{
+		/*dstream<<"FixedHeightmap::setGroundHeight(("
+				<<p.X<<","<<p.Y
+				<<"), "<<y<<")"<<std::endl;*/
+		if(overborder(p))
+			throw InvalidPositionException();
+		m_data[p.Y*W + p.X] = y;
+	}
+	
+	// Returns true on success, false on railure.
+	bool setGroundHeightParent(v2s16 p, f32 y, bool generate=false)
+	{
+		/*// Position on master
+		v2s16 blockpos_nodes = m_pos_on_master * m_blocksize;
+		v2s16 nodepos_master = blockpos_nodes + p;
+		dstream<<"FixedHeightmap::setGroundHeightParent(("
+				<<p.X<<","<<p.Y
+				<<"), "<<y<<"): nodepos_master=("
+				<<nodepos_master.X<<","
+				<<nodepos_master.Y<<")"<<std::endl;
+		m_master->setGroundHeight(nodepos_master, y, false);*/
+		
+		// Try to set on master
+		bool master_got_it = false;
+		if(overborder(p) || atborder(p))
+		{
+			try{
+				// Position on master
+				v2s16 blockpos_nodes = m_pos_on_master * m_blocksize;
+				v2s16 nodepos_master = blockpos_nodes + p;
+				m_master->setGroundHeight(nodepos_master, y, false);
+
+				master_got_it = true;
+			}
+			catch(InvalidPositionException &e)
+			{
+			}
+		}
+		
+		if(overborder(p))
+			return master_got_it;
+		
+		setGroundHeight(p, y);
+
+		return true;
+	}
+	
+	f32 getGroundHeight(v2s16 p, bool generate=false)
+	{
+		if(overborder(p))
+			return GROUNDHEIGHT_NOTFOUND_SETVALUE;
+		return m_data[p.Y*W + p.X];
+	}
+
+	f32 getGroundHeightParent(v2s16 p)
+	{
+		/*v2s16 blockpos_nodes = m_pos_on_master * m_blocksize;
+		return m_master->getGroundHeight(blockpos_nodes + p, false);*/
+
+		if(overborder(p) == false){
+			f32 h = getGroundHeight(p);
+			if(h > GROUNDHEIGHT_VALID_MINVALUE)
+				return h;
+		}
+		
+		// Position on master
+		v2s16 blockpos_nodes = m_pos_on_master * m_blocksize;
+		f32 h = m_master->getGroundHeight(blockpos_nodes + p, false);
+		return h;
+	}
+
+	f32 avgNeighbours(v2s16 p, s16 d);
+
+	f32 avgDiagNeighbours(v2s16 p, s16 d);
+	
+	void makeDiamond(
+			v2s16 center,
+			s16 a,
+			f32 randmax,
+			core::map<v2s16, bool> &next_squares);
+
+	void makeSquare(
+			v2s16 center,
+			s16 a,
+			f32 randmax,
+			core::map<v2s16, bool> &next_diamonds);
+	
+	void DiamondSquare(f32 randmax, f32 randfactor);
+	
+	/*
+		corners: [i]=XY: [0]=00, [1]=10, [2]=11, [3]=10
+	*/
+	void generateContinued(f32 randmax, f32 randfactor, f32 *corners);
+
+	
+	static u32 serializedLength(u8 version, u16 blocksize);
+	u32 serializedLength(u8 version);
+	void serialize(u8 *dest, u8 version);
+	void deSerialize(u8 *source, u8 version);
+	/*static FixedHeightmap * deSerialize(u8 *source, u32 size,
+			u32 &usedsize, Heightmap *master, u8 version);*/
+};
+
+class OneChildHeightmap : public Heightmap
+{
+	s16 m_blocksize;
+
+public:
+
+	FixedHeightmap m_child;
+
+	OneChildHeightmap(s16 blocksize):
+		m_blocksize(blocksize),
+		m_child(this, v2s16(0,0), blocksize)
+	{
+	}
+	
+	f32 getGroundHeight(v2s16 p, bool generate=true)
+	{
+		if(p.X < 0 || p.X > m_blocksize 
+				|| p.Y < 0 || p.Y > m_blocksize)
+			return GROUNDHEIGHT_NOTFOUND_SETVALUE;
+		return m_child.getGroundHeight(p);
+	}
+	void setGroundHeight(v2s16 p, f32 y, bool generate=true)
+	{
+		//dstream<<"OneChildHeightmap::setGroundHeight()"<<std::endl;
+		if(p.X < 0 || p.X > m_blocksize 
+				|| p.Y < 0 || p.Y > m_blocksize)
+			throw InvalidPositionException();
+		m_child.setGroundHeight(p, y);
+	}
+};
+
+
+/*
+	This is a dynamic container of an arbitrary number of heightmaps
+	at arbitrary positions.
+	
+	It is able to redirect queries to the corresponding heightmaps and
+	it generates new heightmaps on-the-fly according to the relevant
+	parameters.
+	
+	It doesn't have a master heightmap because it is meant to be used
+	as such itself.
+
+	Child heightmaps are spaced at m_blocksize distances, and are of
+	size (m_blocksize+1)*(m_blocksize+1)
+
+	This is used as the master heightmap of a Map object.
+*/
+class UnlimitedHeightmap: public Heightmap
+{
+private:
+
+	core::map<v2s16, FixedHeightmap*> m_heightmaps;
+	s16 m_blocksize;
+
+	ValueGenerator *m_randmax_generator;
+	ValueGenerator *m_randfactor_generator;
+	ValueGenerator *m_base_generator;
+
+public:
+
+	UnlimitedHeightmap(
+			s16 blocksize,
+			ValueGenerator *randmax_generator,
+			ValueGenerator *randfactor_generator,
+			ValueGenerator *base_generator
+			):
+		m_blocksize(blocksize),
+		m_randmax_generator(randmax_generator),
+		m_randfactor_generator(randfactor_generator),
+		m_base_generator(base_generator)
+	{
+		assert(m_randmax_generator != NULL);
+		assert(m_randfactor_generator != NULL);
+		assert(m_base_generator != NULL);
+	}
+
+	~UnlimitedHeightmap()
+	{
+		core::map<v2s16, FixedHeightmap*>::Iterator i;
+		i = m_heightmaps.getIterator();
+		for(; i.atEnd() == false; i++)
+		{
+			delete i.getNode()->getValue();
+		}
+
+		delete m_randmax_generator;
+		delete m_randfactor_generator;
+		delete m_base_generator;
+	}
+
+	/*void setParams(f32 randmax, f32 randfactor)
+	{
+		m_randmax = randmax;
+		m_randfactor = randfactor;
+	}*/
+	
+	void print();
+
+	v2s16 getNodeHeightmapPos(v2s16 p)
+	{
+		return v2s16(
+				(p.X>=0 ? p.X : p.X-m_blocksize+1) / m_blocksize,
+				(p.Y>=0 ? p.Y : p.Y-m_blocksize+1) / m_blocksize);
+	}
+
+	// Can throw an InvalidPositionException
+	FixedHeightmap * getHeightmap(v2s16 p, bool generate=true);
+	
+	f32 getGroundHeight(v2s16 p, bool generate=true);
+	void setGroundHeight(v2s16 p, f32 y, bool generate=true);
+	
+	/*static UnlimitedHeightmap * deSerialize(u8 *source, u32 maxsize,
+			u32 &usedsize, u8 version);*/
+	
+	//SharedBuffer<u8> serialize(u8 version);
+	void serialize(std::ostream &os, u8 version);
+	static UnlimitedHeightmap * deSerialize(std::istream &istr);
+};
+
+#endif
+
-- 
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