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noise: parameterise fractal summation types

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This commit is contained in:
Danny Robson 2015-05-18 22:02:10 +10:00
parent c24387bf8f
commit 9b0abd8f7a
5 changed files with 122 additions and 88 deletions
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14
noise.cpp
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@ -24,25 +24,29 @@
//-----------------------------------------------------------------------------
template <typename T>
void
util::noise::fill (image::buffer<float> &pixels,
const util::noise::fractal &gen)
util::noise::fill (image::buffer<T> &pixels,
const util::noise::fractal<T> &gen)
{
size_t h = pixels.h, s = pixels.s, w = pixels.w;
float *data = pixels.data ();
T *data = pixels.data ();
for (size_t y = 0; y < h; ++y)
for (size_t x = 0; x < w; ++x)
data[y * s + x] = gen (double(x), double(y));
data[y * s + x] = gen (x, y);
}
template void util::noise::fill (image::buffer<float>&, const util::noise::fractal<float>&);
template void util::noise::fill (image::buffer<double>&, const util::noise::fractal<double>&);
//-----------------------------------------------------------------------------
void
util::noise::image2d (uint8_t *restrict pixels,
size_t width,
size_t height,
const util::noise::fractal &p) {
const util::noise::fractal<float> &p) {
for (size_t y = 0; y < height; ++y)
for (size_t x = 0; x < width; ++x) {
double v = p.eval (x, y);

5
noise.hpp
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@ -27,9 +27,10 @@
namespace util {
namespace noise {
void fill (image::buffer<float>&, const util::noise::fractal&);
template <typename T>
void fill (image::buffer<T>&, const util::noise::fractal<T>&);
void image2d (uint8_t *restrict pixels, size_t width, size_t height, const util::noise::fractal&);
void image2d (uint8_t *restrict pixels, size_t width, size_t height, const util::noise::fractal<float>&);
}
}

146
noise/fractal.cpp
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@ -21,10 +21,16 @@
#include <algorithm>
using util::noise::fractal;
using util::noise::fbm;
using util::noise::musgrave;
///////////////////////////////////////////////////////////////////////////////
util::noise::fractal::fractal (unsigned _octaves,
double _frequency,
double _lacunarity):
template <typename T>
fractal<T>::fractal (unsigned _octaves,
T _frequency,
T _lacunarity):
octaves (_octaves),
frequency (_frequency),
lacunarity (_lacunarity)
@ -32,54 +38,64 @@ util::noise::fractal::fractal (unsigned _octaves,
//-----------------------------------------------------------------------------
util::noise::fractal::fractal ():
template <typename T>
fractal<T>::fractal ():
octaves (1),
frequency (0.1),
lacunarity (0.6)
frequency (T(0.1)),
lacunarity (T(0.6))
{ ; }
//-----------------------------------------------------------------------------
util::noise::fractal::~fractal ()
template <typename T>
fractal<T>::~fractal ()
{ ; }
//-----------------------------------------------------------------------------
double
util::noise::fractal::eval (double, double) const
template <typename T>
T
fractal<T>::eval (T, T) const
{ unreachable (); }
//-----------------------------------------------------------------------------
namespace util { namespace noise {
template struct fractal<float>;
template struct fractal<double>;
} }
///////////////////////////////////////////////////////////////////////////////
template <typename B>
util::noise::fbm<B>::fbm (unsigned _octaves,
double _frequency,
double _lacunarity,
seed_t _seed):
fractal (_octaves, _frequency, _lacunarity),
template <typename T, typename B>
fbm<T,B>::fbm (unsigned _octaves,
T _frequency,
T _lacunarity,
seed_t _seed):
fractal<T> (_octaves, _frequency, _lacunarity),
basis (_seed)
{ ; }
//-----------------------------------------------------------------------------
template <typename B>
util::noise::fbm<B>::fbm ()
template <typename T, typename B>
fbm<T,B>::fbm ()
{ ; }
//-----------------------------------------------------------------------------
template <typename B>
double
util::noise::fbm<B>::eval (double x, double y) const {
double total = 0.0;
double f = this->frequency;
double a = 1.0;
double a_sum = 0.0;
template <typename T, typename B>
T
fbm<T,B>::eval (T x, T y) const {
T total = 0;
T f = this->frequency;
T a = 1;
T a_sum = 0;
for (size_t i = 0; i < this->octaves; ++i) {
total += basis.eval (x * f, y * f) * a;
f *= 2.0;
f *= 2;
a_sum += a;
a *= this->lacunarity;
@ -90,65 +106,71 @@ util::noise::fbm<B>::eval (double x, double y) const {
//-----------------------------------------------------------------------------
template struct util::noise::fbm<util::noise::cellular<double>>;
template struct util::noise::fbm<util::noise::gradient<double,util::lerp::linear>>;
template struct util::noise::fbm<util::noise::gradient<double,util::lerp::quintic>>;
template struct util::noise::fbm<util::noise::value<double,util::lerp::linear>>;
template struct util::noise::fbm<util::noise::value<double,util::lerp::quintic>>;
template struct util::noise::fbm<float, util::noise::cellular<float>>;
template struct util::noise::fbm<float, util::noise::gradient<float,util::lerp::linear>>;
template struct util::noise::fbm<float, util::noise::gradient<float,util::lerp::quintic>>;
template struct util::noise::fbm<float, util::noise::value<float,util::lerp::linear>>;
template struct util::noise::fbm<float, util::noise::value<float,util::lerp::quintic>>;
template struct util::noise::fbm<double, util::noise::cellular<double>>;
template struct util::noise::fbm<double, util::noise::gradient<double,util::lerp::linear>>;
template struct util::noise::fbm<double, util::noise::gradient<double,util::lerp::quintic>>;
template struct util::noise::fbm<double, util::noise::value<double,util::lerp::linear>>;
template struct util::noise::fbm<double, util::noise::value<double,util::lerp::quintic>>;
///////////////////////////////////////////////////////////////////////////////
template <typename B>
util::noise::musgrave<B>::musgrave (unsigned _octaves,
double _frequency,
double _lacunarity,
seed_t _seed):
fractal (_octaves, _frequency, _lacunarity),
template <typename T, typename B>
musgrave<T,B>::musgrave (unsigned _octaves,
T _frequency,
T _lacunarity,
seed_t _seed):
fractal<T> (_octaves, _frequency, _lacunarity),
basis (_seed)
{ ; }
//-----------------------------------------------------------------------------
template <typename B>
util::noise::musgrave<B>::musgrave ()
template <typename T, typename B>
musgrave<T,B>::musgrave ()
{ ; }
//-----------------------------------------------------------------------------
template <typename B>
double
util::noise::musgrave<B>::eval (double x, double y) const {
double total = 0.0;
double f = this->frequency;
double a = 1.0;
template <typename T, typename B>
T
musgrave<T,B>::eval (T x, T y) const {
T total = 0;
T f = this->frequency;
T a = 1;
double weight = 1.0;
double offset = 1.0;
double gain = 2.0;
T weight = 1;
T offset = 1;
T gain = 2;
double signal;
T signal;
signal = basis.eval (x * f, y * f);
signal = fabs (signal);
signal = std::fabs (signal);
signal = offset - signal;
signal *= signal;
total = signal;
for (size_t i = 1; i < this->octaves; ++i) {
f *= 2.0;
a *= this->lacunarity;
f *= 2;
a *= this->lacunarity;
weight = signal * gain;
weight = max (0.0, min (1.0, weight));
weight = limit (weight, 0, 1);
signal = basis.eval (x * f, y * f);
signal = fabs (signal);
signal = std::fabs (signal);
signal = offset - signal;
signal *= signal;
signal *= weight;
total += signal * a;
total = min (1.0, max (0.0, total));
total = limit (total, 0, 1);
}
return total;
@ -156,9 +178,15 @@ util::noise::musgrave<B>::eval (double x, double y) const {
//-----------------------------------------------------------------------------
template struct util::noise::musgrave<util::noise::cellular<double>>;
template struct util::noise::musgrave<util::noise::gradient<double,util::lerp::linear>>;
template struct util::noise::musgrave<util::noise::gradient<double,util::lerp::quintic>>;
template struct util::noise::musgrave<util::noise::value<double,util::lerp::linear>>;
template struct util::noise::musgrave<util::noise::value<double,util::lerp::quintic>>;
template struct util::noise::musgrave<float, util::noise::cellular<float>>;
template struct util::noise::musgrave<float, util::noise::gradient<float,util::lerp::linear>>;
template struct util::noise::musgrave<float, util::noise::gradient<float,util::lerp::quintic>>;
template struct util::noise::musgrave<float, util::noise::value<float,util::lerp::linear>>;
template struct util::noise::musgrave<float, util::noise::value<float,util::lerp::quintic>>;
template struct util::noise::musgrave<double, util::noise::cellular<double>>;
template struct util::noise::musgrave<double, util::noise::gradient<double,util::lerp::linear>>;
template struct util::noise::musgrave<double, util::noise::gradient<double,util::lerp::quintic>>;
template struct util::noise::musgrave<double, util::noise::value<double,util::lerp::linear>>;
template struct util::noise::musgrave<double, util::noise::value<double,util::lerp::quintic>>;

39
noise/fractal.hpp
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@ -22,51 +22,52 @@
namespace util {
namespace noise {
/// Base noise summation
template <typename T>
struct fractal {
fractal (unsigned octaves,
double frequency,
double lacunarity);
fractal (unsigned octaves,
T frequency,
T lacunarity);
fractal ();
virtual ~fractal ();
unsigned octaves;
double frequency;
double lacunarity;
T frequency;
T lacunarity;
virtual double operator() (double x, double y) const { return eval (x, y); };
virtual double eval (double x, double y) const = 0;
T operator() (T x, T y) const { return eval (x, y); };
virtual T eval (T x, T y) const = 0;
};
/// Fractal Brownian Motion summation.
template <typename B>
struct fbm : public fractal {
using seed_t = typename basis<double>::seed_t;
template <typename T, typename B>
struct fbm : public fractal<T> {
using seed_t = typename basis<T>::seed_t;
fbm (unsigned octaves,
double frequency,
double lacunarity,
T frequency,
T lacunarity,
seed_t seed);
fbm ();
B basis;
virtual double eval (double x, double y) const;
virtual T eval (T x, T y) const;
};
/// Rigid Multifractal noise summation.
template <typename B>
struct musgrave : public fractal {
using seed_t = typename basis<double>::seed_t;
template <typename T, typename B>
struct musgrave : public fractal<T> {
using seed_t = typename basis<T>::seed_t;
musgrave (unsigned octaves,
double frequency,
double lacunarity,
T frequency,
T lacunarity,
seed_t seed);
musgrave ();
B basis;
virtual double eval (double x, double y) const;
virtual T eval (T x, T y) const;
};
}
}

6
tools/noise.cpp
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@ -11,9 +11,9 @@ main (void)
//using basis_t = util::noise::gradient<lerp_t>;
//using noise_t = util::noise::fbm<basis_t>;
using noise_t = util::noise::fbm<util::noise::gradient<double,util::lerp::quintic>>;
//using noise_t = util::noise::musgrave<util::noise::gradient<double,util::lerp::quintic>>;
//using noise_t = util::noise::fbm<util::noise::cellular<double>>;
using noise_t = util::noise::fbm<float,util::noise::gradient<float,util::lerp::quintic>>;
//using noise_t = util::noise::musgrave<float,util::noise::gradient<float,util::lerp::quintic>>;
//using noise_t = util::noise::fbm<float,util::noise::cellular<float>>;
util::noise::fill (img, noise_t {});