From 9b6365f9f24250453a19b92e18001bb31bb747b2 Mon Sep 17 00:00:00 2001
From: vladislavbelov <vladislavbelov@wildfiregames.com>
Date: Wed, 20 Apr 2022 20:22:01 +0000
Subject: [PATCH] Removes unused Noise generator added in 18eb72a25a without
 any actual usage.

60befbd1cf added the exact same implementation to the rmgen tool,
469d0fe5c5 removed the rmgen tool along with the original implementation
of noise.

Patch By: smiley
Differential Revision: https://code.wildfiregames.com/D4611
This was SVN commit r26810.
---
 source/maths/Noise.cpp | 184 -----------------------------------------
 source/maths/Noise.h   |  70 ----------------
 2 files changed, 254 deletions(-)
 delete mode 100644 source/maths/Noise.cpp
 delete mode 100644 source/maths/Noise.h

diff --git a/source/maths/Noise.cpp b/source/maths/Noise.cpp
deleted file mode 100644
index 72082306a6..0000000000
--- a/source/maths/Noise.cpp
+++ /dev/null
@@ -1,184 +0,0 @@
-/* Copyright (C) 2009 Wildfire Games.
- * This file is part of 0 A.D.
- *
- * 0 A.D. is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * 0 A.D. is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * 2D and 3D seamless Perlin noise
- */
-
-// Based on http://www.cs.cmu.edu/~mzucker/code/perlin-noise-math-faq.html
-// and http://mrl.nyu.edu/~perlin/paper445.pdf.
-// Not optimized for speed yet.
-
-#include "precompiled.h"
-#include "Noise.h"
-#include <cmath>
-#include <boost/random/mersenne_twister.hpp>
-
-namespace
-{
-	/// Random number generator (Boost Mersenne Twister)
-	boost::mt19937 rng;
-
-	/// Utility function for random numbers
-	float randFloat() {
-		return ((float)rng()) / 4294967296.0f;
-	}
-
-	/// Utility function used in both noises as an ease curve
-	float easeCurve(float t)
-	{
-		return t*t*t*(t*(t*6-15)+10);
-	}
-}
-
-Noise2D::Noise2D(int f)
-{
-	freq = f;
-	grads = new CVector2D*[freq];
-	for(int i=0; i<freq; i++)
-	{
-		grads[i] = new CVector2D[freq];
-		for(int j=0; j<freq; j++)
-		{
-			float a = randFloat() * 2 * (float)M_PI;
-			grads[i][j] = CVector2D(cos(a), sin(a));
-		}
-	}
-}
-
-Noise2D::~ Noise2D()
-{
-	for(int i=0; i<freq; i++)
-	{
-		delete[] grads[i];
-	}
-	delete[] grads;
-}
-
-float Noise2D::operator()(float x, float y)
-{
-	x *= freq;
-	y *= freq;
-
-	int ix = (int)floor(x);
-	int iy = (int)floor(y);
-
-	float fx = x - ix;
-	float fy = y - iy;
-
-	ix %= freq; if(ix<0) ix += freq;
-	iy %= freq; if(iy<0) iy += freq;
-
-	int ix1 = (ix+1) % freq;
-	int iy1 = (iy+1) % freq;
-
-	float s = grads[ix][iy].Dot(CVector2D(fx, fy));
-	float t = grads[ix1][iy].Dot(CVector2D(fx-1, fy));
-	float u = grads[ix][iy1].Dot(CVector2D(fx, fy-1));
-	float v = grads[ix1][iy1].Dot(CVector2D(fx-1, fy-1));
-
-	float ex = easeCurve(fx);
-	float ey = easeCurve(fy);
-	float a = s + ex*(t-s);
-	float b = u + ex*(v-u);
-	return (a + ey*(b-a)) * .5 + .5;
-}
-
-Noise3D::Noise3D(int f, int v) : freq(f), vfreq(v)
-{
-	grads = new CVector3D**[freq];
-	for(int i=0; i<freq; i++)
-	{
-		grads[i] = new CVector3D*[freq];
-		for(int j=0; j<freq; j++)
-		{
-			grads[i][j] = new CVector3D[vfreq];
-			for(int k=0; k<vfreq; k++)
-			{
-				CVector3D vec;
-				do {
-					vec = CVector3D(2*randFloat()-1, 2*randFloat()-1, 2*randFloat()-1);
-				}
-				while(vec.LengthSquared() > 1 || vec.LengthSquared() < 0.1);
-				vec.Normalize();
-				grads[i][j][k] = CVector3D(vec.X, vec.Y, vec.Z);
-			}
-		}
-	}
-}
-
-Noise3D::~ Noise3D()
-{
-	for(int i=0; i<freq; i++)
-	{
-		for(int j=0; j<freq; j++)
-		{
-			delete[] grads[i][j];
-		}
-		delete[] grads[i];
-	}
-	delete[] grads;
-}
-
-float Noise3D::operator()(float x, float y, float z)
-{
-	x *= freq;
-	y *= freq;
-	z *= vfreq;
-
-	int ix = (int)floor(x);
-	int iy = (int)floor(y);
-	int iz = (int)floor(z);
-
-	float fx = x - ix;
-	float fy = y - iy;
-	float fz = z - iz;
-
-	ix %= freq; if(ix<0) ix += freq;
-	iy %= freq; if(iy<0) iy += freq;
-	iz %= vfreq; if(iz<0) iz += vfreq;
-
-	int ix1 = (ix+1) % freq;
-	int iy1 = (iy+1) % freq;
-	int iz1 = (iz+1) % vfreq;
-
-	float s0 = grads[ix][iy][iz].Dot(CVector3D(fx, fy, fz));
-	float t0 = grads[ix1][iy][iz].Dot(CVector3D(fx-1, fy, fz));
-	float u0 = grads[ix][iy1][iz].Dot(CVector3D(fx, fy-1, fz));
-	float v0 = grads[ix1][iy1][iz].Dot(CVector3D(fx-1, fy-1, fz));
-
-	float s1 = grads[ix][iy][iz1].Dot(CVector3D(fx, fy, fz-1));
-	float t1 = grads[ix1][iy][iz1].Dot(CVector3D(fx-1, fy, fz-1));
-	float u1 = grads[ix][iy1][iz1].Dot(CVector3D(fx, fy-1, fz-1));
-	float v1 = grads[ix1][iy1][iz1].Dot(CVector3D(fx-1, fy-1, fz-1));
-
-	float ex = easeCurve(fx);
-	float ey = easeCurve(fy);
-	float ez = easeCurve(fz);
-
-	float a0 = s0 + ex*(t0-s0);
-	float b0 = u0 + ex*(v0-u0);
-	float c0 = a0 + ey*(b0-a0);
-
-	float a1 = s1 + ex*(t1-s1);
-	float b1 = u1 + ex*(v1-u1);
-	float c1 = a1 + ey*(b1-a1);
-
-	return (c0 + ez*(c1-c0)) * .5 + .5;
-}
-
-
diff --git a/source/maths/Noise.h b/source/maths/Noise.h
deleted file mode 100644
index 5a8e72b61c..0000000000
--- a/source/maths/Noise.h
+++ /dev/null
@@ -1,70 +0,0 @@
-/* Copyright (C) 2013 Wildfire Games.
- * This file is part of 0 A.D.
- *
- * 0 A.D. is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 2 of the License, or
- * (at your option) any later version.
- *
- * 0 A.D. is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * 2D and 3D seamless Perlin noise
- */
-
-// Based on http://www.cs.cmu.edu/~mzucker/code/perlin-noise-math-faq.html
-// and http://mrl.nyu.edu/~perlin/paper445.pdf.
-// Not optimized for speed yet.
-
-#ifndef INCLUDED_NOISE
-#define INCLUDED_NOISE
-
-#include "Vector2D.h"
-#include "Vector3D.h"
-#include "MathUtil.h"
-
-class Noise2D
-{
-	NONCOPYABLE(Noise2D);
-
-	/// Frequency in X and Y
-	int freq;
-
-	/// freq*freq random gradient vectors in the unit cube
-	CVector2D** grads;
-public:
-	Noise2D(int freq);
-	~Noise2D();
-
-	/// Evaluate the noise function at a given point
-	float operator() (float x, float y);
-};
-
-class Noise3D
-{
-	NONCOPYABLE(Noise3D);
-
-	/// Frequency in X and Y
-	int freq;
-
-	/// Frequency in Z (vertical frequency)
-	int vfreq;
-
-	/// freq*freq*vfreq random gradient vectors in the unit cube
-	CVector3D*** grads;
-public:
-	Noise3D(int freq, int vfreq);
-	~Noise3D();
-
-	/// Evaluate the noise function at a given point
-	float operator() (float x, float y, float z);
-};
-
-#endif