From 15f27a19378345c22b07e37ab324581d55ad9c5b Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Tue, 8 Feb 2011 10:11:26 +0200
Subject: [PATCH] made it to work with my windows compiler

---
 src/main.cpp  |  9 +++++++++
 src/map.cpp   |  7 ++++---
 src/noise.cpp | 14 +++++++++++---
 3 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 17d481cac..e1d8492fd 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -364,6 +364,7 @@ Doing now (most important at the top):
 #include "config.h"
 #include "guiMainMenu.h"
 #include "mineral.h"
+#include "noise.h"
 
 IrrlichtWrapper *g_irrlicht;
 
@@ -1545,12 +1546,20 @@ int main(int argc, char *argv[])
 	/*
 		Run unit tests
 	*/
+
 	if((ENABLE_TESTS && cmd_args.getFlag("disable-unittests") == false)
 			|| cmd_args.getFlag("enable-unittests") == true)
 	{
 		run_tests();
 	}
 	
+	/*for(s16 y=-100; y<100; y++)
+	for(s16 x=-100; x<100; x++)
+	{
+		std::cout<<noise2d_gradient((double)x/10,(double)y/10, 32415)<<std::endl;
+	}
+	return 0;*/
+	
 	/*
 		Some parameters
 	*/
diff --git a/src/map.cpp b/src/map.cpp
index b51f1dac2..696019f3a 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -2009,9 +2009,10 @@ double tree_amount_2d(u64 seed, v2s16 p)
 double base_rock_level_2d(u64 seed, v2s16 p)
 {
 	// The base ground level
-	double base = WATER_LEVEL - 4.0 + 25. * noise2d_perlin(
+	double base = (double)WATER_LEVEL - 4.0 + 25. * noise2d_perlin(
 			0.5+(float)p.X/250., 0.5+(float)p.Y/250.,
 			(seed>>32)+654879876, 6, 0.6);
+	
 	/*// A bit hillier one
 	double base2 = WATER_LEVEL - 4.0 + 40. * noise2d_perlin(
 			0.5+(float)p.X/250., 0.5+(float)p.Y/250.,
@@ -2020,7 +2021,7 @@ double base_rock_level_2d(u64 seed, v2s16 p)
 		base = base2;*/
 #if 1
 	// Higher ground level
-	double higher = WATER_LEVEL + 13. + 50. * noise2d_perlin(
+	double higher = (double)WATER_LEVEL + 13. + 50. * noise2d_perlin(
 			0.5+(float)p.X/500., 0.5+(float)p.Y/500.,
 			seed+85039, 6, 0.69);
 	//higher = 30; // For debugging
@@ -2046,7 +2047,7 @@ double base_rock_level_2d(u64 seed, v2s16 p)
 	/*double a = 0.5 + b * (a_off + noise2d_perlin(
 			0.5+(float)p.X/500., 0.5+(float)p.Y/500.,
 			seed-359, 6, 0.7));*/
-	double a = 0.5 + b * (a_off + noise2d_perlin(
+	double a = (double)0.5 + b * (a_off + noise2d_perlin(
 			0.5+(float)p.X/250., 0.5+(float)p.Y/250.,
 			seed-359, 5, 0.60));
 	// Limit
diff --git a/src/noise.cpp b/src/noise.cpp
index dda0e5614..a98dd5886 100644
--- a/src/noise.cpp
+++ b/src/noise.cpp
@@ -19,6 +19,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include <math.h>
 #include "noise.h"
+#include <iostream>
 
 #define NOISE_MAGIC_X 1619
 #define NOISE_MAGIC_Y 31337
@@ -62,16 +63,23 @@ double noise2d_gradient(double x, double y, int seed)
 {
 	int x0 = (x > 0.0 ? (int)x : (int)x - 1);
 	int y0 = (y > 0.0 ? (int)y : (int)y - 1);
-	double xl = x-x0;
-	double yl = y-y0;
+	double xl = x - (double)x0;
+	double yl = y - (double)y0;
 	int n00 = (int)((noise2d(x0, y0, seed)+1)*8);
 	int n10 = (int)((noise2d(x0+1, y0, seed)+1)*8);
 	int n01 = (int)((noise2d(x0, y0+1, seed)+1)*8);
 	int n11 = (int)((noise2d(x0+1, y0+1, seed)+1)*8);
+	/* In this format, these fail to work on MSVC8 if n00 < 4
 	double s = dotProduct(cos_lookup[n00], cos_lookup[(n00-4)%16], xl, yl);
 	double u = dotProduct(-cos_lookup[n10], cos_lookup[(n10-4)%16], 1.-xl, yl);
 	double v = dotProduct(cos_lookup[n01], -cos_lookup[(n01-4)%16], xl, 1.-yl);
-	double w = dotProduct(-cos_lookup[n11], -cos_lookup[(n11-4)%16], 1.-xl, 1.-yl);
+	double w = dotProduct(-cos_lookup[n11], -cos_lookup[(n11-4)%16], 1.-xl, 1.-yl);*/
+	double s = dotProduct(cos_lookup[n00], cos_lookup[(n00+12)%16], xl, yl);
+	double u = dotProduct(-cos_lookup[n10], cos_lookup[(n10+12)%16], 1.-xl, yl);
+	double v = dotProduct(cos_lookup[n01], -cos_lookup[(n01+12)%16], xl, 1.-yl);
+	double w = dotProduct(-cos_lookup[n11], -cos_lookup[(n11+12)%16], 1.-xl, 1.-yl);
+	/*std::cout<<"x="<<x<<" y="<<y<<" x0="<<x0<<" y0="<<y0<<" xl="<<xl<<" yl="<<yl<<" n00="<<n00<<" n10="<<n01<<" s="<<s<<std::endl;
+	std::cout<<"cos_lookup[n00]="<<(cos_lookup[n00])<<" cos_lookup[(n00-4)%16]="<<(cos_lookup[(n00-4)%16])<<std::endl;*/
 	return biLinearInterpolation(s,u,v,w,xl,yl);
 }