Ditched the perlin I wrote before

makefile

@@ -10,7 +10,7 @@ export
 OUTDIR=out
 
 all: $(OUTDIR)
-	$(MAKE) -C perlin
+	$(MAKE) -C utils
 	$(MAKE) -C src
 
 $(OUTDIR):

perlin/perlin_noise.cpp

@@ -1,86 +0,0 @@
-/* Copyright: (c) Kayne Ruse 2014
- * 
- * This software is provided 'as-is', without any express or implied
- * warranty. In no event will the authors be held liable for any damages
- * arising from the use of this software.
- * 
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- * 
- * 1. The origin of this software must not be misrepresented; you must not
- * claim that you wrote the original software. If you use this software
- * in a product, an acknowledgment in the product documentation would be
- * appreciated but is not required.
- * 
- * 2. Altered source versions must be plainly marked as such, and must not be
- * misrepresented as being the original software.
- * 
- * 3. This notice may not be removed or altered from any source
- * distribution.
-*/
-#include "perlin_noise.hpp"
-
-#include "vector2.hpp"
-
-#include <cmath>
-
-//-------------------------
-//Public access members
-//-------------------------
-
-double SimpleRNG::operator()(double x) {
-	return (x + seed) * 345589144.0 + 1123581321.0;
-};
-
-Vector2 PerlinNoise::Gradient(Vector2 pos) {
-	//could cache this result
-	double angle = rng(pos.x * pos.y + pos.y);
-	Vector2 v(cos(angle), sin(angle));
-	v.Normalize();
-	return v;
-}
-
-double PerlinNoise::Noise(double x, double y, double width, double height) {
-	Vector2 queryPoint = {x, y};
-
-	//calc the region's position
-	x = Snap(x, width);
-	y = Snap(y, height);
-
-	//determine the grid points
-	Vector2 tl = {x, y};
-	Vector2 tr = {x + width, y};
-	Vector2 bl = {x, y + height};
-	Vector2 br = {x + width, y + height};
-
-	//influence equasion
-	double s = ScalarProduct(Gradient(tl), queryPoint - tl);
-	double t = ScalarProduct(Gradient(tr), queryPoint - tr);
-	double u = ScalarProduct(Gradient(bl), queryPoint - bl);
-	double v = ScalarProduct(Gradient(br), queryPoint - br);
-
-	//get the noise
-	double a = s + Curve((t - s) / width);
-	double b = u + Curve((v - u) / width);
-	return a + Curve((b - a) / height);
-}
-
-//-------------------------
-//Static utility functions
-//-------------------------
-
-double PerlinNoise::Curve(double x) {
-	//param: 0 to 1 inclusive
-	return 3.0 * pow(x, 2.0) - 2.0 * pow(x, 3.0);
-}
-
-double PerlinNoise::Snap(double x, double base) {
-	//snap to a grid (floating point version)
-	return floor(x / base) * base;
-}
-
-double PerlinNoise::ScalarProduct(Vector2 lhs, Vector2 rhs) {
-	//the dot product
-	return lhs.x * rhs.x + lhs.y * rhs.y;
-}

pseudocode.txt

@@ -0,0 +1,4 @@
+All terrain is grass by default
+
+produce a hightmap for the terrain
+

src/makefile

@@ -1,5 +1,5 @@
 #config
-INCLUDES+=. ../perlin
+INCLUDES+=. ../utils
 LIBS+=../libcommon.a -lmingw32 -lSDLmain -lSDL
 CXXFLAGS+=-std=c++11 $(addprefix -I,$(INCLUDES))
 

src/shell_scene.cpp

@@ -37,12 +37,12 @@ ShellScene::ShellScene() {
 	int height = 80;
 	image.CreateSurface(GetScreen()->w, GetScreen()->h);
 
-	double mod;
-	int colour;
+	double mod = 0.0;
+	int colour = 0;
 	std::cout << "Beggining generation" << std::endl;
 	for (int i = 0; i < image.GetSurface()->w; i++) {
 		for (int j = 0; j < image.GetSurface()->h; j++) {
-			mod = generator.Noise(i, j, width, height);
+//			mod = generator.Noise(i, j, width, height);
 			colour = SDL_MapRGB(image.GetSurface()->format, 255*mod, 255*mod, 255*mod);
 			setPixel(image.GetSurface(), i, j, colour);
 		}

src/shell_scene.hpp

@@ -25,7 +25,6 @@
 #include "base_scene.hpp"
 
 #include "image.hpp"
-#include "perlin_noise.hpp"
 
 class ShellScene : public BaseScene {
 public:
@@ -48,7 +47,7 @@ protected:
 	void KeyUp(SDL_KeyboardEvent const&);
 
 	//members
-	PerlinNoise generator;
+//	PerlinNoise generator;
 	Image image;
 };
 

utils/maths.cpp

@@ -0,0 +1,36 @@
+/* Copyright: (c) Kayne Ruse 2014
+ * 
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ * 
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ * 
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 
+ * 3. This notice may not be removed or altered from any source
+ * distribution.
+*/
+#include "maths.hpp"
+
+double curve(double x) {
+	return 3.0 * pow(x, 2.0) - 2.0 * pow(x, 3.0);
+}
+
+double snap(double x, double base) {
+	//snap to a grid (floating point version)
+	return floor(x / base) * base;
+}
+
+double scalarProduct(Vector2 lhs, Vector2 rhs) {
+	//the dot product
+	return lhs.x * rhs.x + lhs.y * rhs.y;
+}

utils/maths.hpp

@@ -0,0 +1,36 @@
+/* Copyright: (c) Kayne Ruse 2014
+ * 
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ * 
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ * 
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 
+ * 3. This notice may not be removed or altered from any source
+ * distribution.
+*/
+#ifndef MATHS_HPP_
+#define MATHS_HPP_
+
+#include "vector2.hpp"
+
+//param: 0 to 1 inclusive
+double curve(double);
+
+//snap x to a grid of base
+double snap(double x, double base);
+
+//vector dot product
+double scalarProduct(Vector2, Vector2);
+
+#endif

utils/simple_rng.hpp

@@ -19,40 +19,23 @@
  * 3. This notice may not be removed or altered from any source
  * distribution.
 */
-#ifndef PERLINNOISE_HPP_
-#define PERLINNOISE_HPP_
-
-#include "vector2.hpp"
+#ifndef SIMPLERNG_HPP_
+#define SIMPLERNG_HPP_
 
 class SimpleRNG {
 public:
 	SimpleRNG() = default;
-	SimpleRNG(double x) { SetSeed(x); }
+	SimpleRNG(int x) { SetSeed(x); }
 
-	double SetSeed(double s) { return seed = s; }
-	double GetSeed() { return seed; }
+	int SetSeed(int s) { return seed = s; }
+	int GetSeed() { return seed; }
 
-	double operator()(double x);
+	int SimpleRNG::operator()(int x) {
+		return (x + seed) * 345589144 + 1123581321 + seed;
+	};
 
 private:
-	double seed = 8891.0;
+	int seed = 8891;
 };
 
-class PerlinNoise {
-public:
-	PerlinNoise() = default;
-	~PerlinNoise() = default;
-
-	Vector2 Gradient(Vector2);
-	double Influcence(Vector2 gridPoint, Vector2 queryPoint);
-
-	double Noise(double x, double y, double width, double height);
-private:
-	static inline double Curve(double x);
-	static inline double Snap(double x, double base);
-	static inline double ScalarProduct(Vector2 lhs, Vector2 rhs);
-
-	SimpleRNG rng;
-};
-
-#endif
+#endif