Started the new FractalNoise implementation
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5579045604
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8 changed files with 328 additions and 3 deletions
94
src/basics/FractalNoise.cpp
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94
src/basics/FractalNoise.cpp
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#include "FractalNoise.h"
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FractalNoise::FractalNoise()
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{
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scaling = 1.0;
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height = 1.0;
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step_scaling = 2.0;
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step_height = 0.5;
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slope = 0.0;
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ridge = 0.0;
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}
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void FractalNoise::setScaling(double scaling, double height)
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{
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this->scaling = scaling < 0.00000001 ? 0.0 : 1.0 / scaling;
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this->height = scaling * height;
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}
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void FractalNoise::setStep(double scaling_factor, double height_factor)
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{
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this->step_scaling = scaling_factor < 0.00000001 ? 0.0 : 1.0 / scaling_factor;
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this->step_height = scaling_factor * height_factor;
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}
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void FractalNoise::setSlope(double slope_factor)
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{
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this->slope = slope_factor;
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}
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void FractalNoise::setRidge(double ridge_factor)
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{
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this->ridge = ridge_factor;
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}
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double FractalNoise::get1d(double detail, double x) const
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{
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double current_scaling = scaling;
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double current_height = height;
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double result = 0.0;
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while (current_height >= detail)
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{
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result += getBase1d(x * current_scaling) * current_height;
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current_scaling *= step_scaling;
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current_height *= step_height;
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}
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return result;
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}
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double FractalNoise::get2d(double detail, double x, double y) const
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{
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double current_scaling = scaling;
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double current_height = height;
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double result = 0.0;
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while (current_height >= detail)
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{
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result += getBase2d(x * current_scaling, y * current_scaling) * current_height;
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current_scaling *= step_scaling;
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current_height *= step_height;
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}
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return result;
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}
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double FractalNoise::get3d(double detail, double x, double y, double z) const
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{
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double current_scaling = scaling;
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double current_height = height;
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double result = 0.0;
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while (current_height >= detail)
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{
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result += getBase3d(x * current_scaling, y * current_scaling, z * current_scaling) * current_height;
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current_scaling *= step_scaling;
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current_height *= step_height;
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}
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return result;
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}
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double FractalNoise::getBase1d(double x) const
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{
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return getBase2d(x, 0.0);
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}
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double FractalNoise::getBase2d(double x, double y) const
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{
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return getBase3d(x, y, 0.0);
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}
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46
src/basics/FractalNoise.h
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46
src/basics/FractalNoise.h
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#ifndef FRACTALNOISE_H
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#define FRACTALNOISE_H
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#include "basics_global.h"
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#include "NoiseState.h"
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namespace paysages {
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namespace basics {
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/*!
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* \brief Fractal noise generator, based on a sum of simple noise functions.
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*/
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class BASICSSHARED_EXPORT FractalNoise
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{
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public:
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FractalNoise();
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void setScaling(double scaling, double height=1.0);
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void setStep(double scaling_factor, double height_factor=1.0);
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void setSlope(double slope_factor);
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void setRidge(double ridge_factor);
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double get1d(double detail, double x) const;
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double get2d(double detail, double x, double y) const;
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double get3d(double detail, double x, double y, double z) const;
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virtual double getBase1d(double x) const;
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virtual double getBase2d(double x, double y) const;
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virtual double getBase3d(double x, double y, double z) const = 0;
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private:
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NoiseState state;
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double scaling;
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double height;
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double step_scaling;
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double step_height;
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double slope;
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double ridge;
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};
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}
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}
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#endif // FRACTALNOISE_H
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@ -32,7 +32,8 @@ SOURCES += \
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Texture2D.cpp \
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Texture3D.cpp \
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Texture4D.cpp \
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NoiseState.cpp
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NoiseState.cpp \
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FractalNoise.cpp
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HEADERS +=\
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basics_global.h \
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Texture2D.h \
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Texture3D.h \
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Texture4D.h \
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NoiseState.h
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NoiseState.h \
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FractalNoise.h
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unix:!symbian {
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maemo5 {
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@ -19,6 +19,7 @@ namespace basics {
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class Color;
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class NoiseGenerator;
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class NoiseState;
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class FractalNoise;
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class Curve;
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class ColorProfile;
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class Texture2D;
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@ -18,6 +18,9 @@ static Color _postProcessFragment(SoftwareRenderer* renderer, const Vector3 &loc
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TEST(Bruneton, AerialPerspective1)
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{
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#ifndef TESTS_FULL
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return;
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#endif
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Scenery scenery;
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SoftwareRenderer renderer(&scenery);
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renderer.render_width = 800;
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@ -45,6 +48,9 @@ TEST(Bruneton, AerialPerspective1)
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TEST(Bruneton, AerialPerspective2)
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{
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#ifndef TESTS_FULL
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return;
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#endif
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Scenery scenery;
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AtmosphereDefinition* atmo = scenery.getAtmosphere();
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169
src/tests/FractalNoise_Test.cpp
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169
src/tests/FractalNoise_Test.cpp
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#include "BaseTestCase.h"
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#include "FractalNoise.h"
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class TestFractalNoise:public FractalNoise
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{
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public:
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TestFractalNoise(double value=0.0):FractalNoise(), value(value)
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{
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calls = 0;
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}
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virtual double getBase3d(double x, double y, double z) const override
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{
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((TestFractalNoise*)this)->calls++;
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return value + x + y + z;
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}
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public:
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int calls;
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private:
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double value;
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};
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TEST(FractalNoise, AutoBase2d)
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{
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TestFractalNoise noise(0.2);
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double result = noise.getBase2d(0.4, 0.1);
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ASSERT_EQ(1, noise.calls);
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EXPECT_DOUBLE_EQ(0.7, result);
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}
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TEST(FractalNoise, AutoBase1d)
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{
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TestFractalNoise noise(0.2);
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double result = noise.getBase1d(0.4);
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ASSERT_EQ(1, noise.calls);
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EXPECT_DOUBLE_EQ(0.6, result);
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}
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TEST(FractalNoise, NoStep)
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{
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TestFractalNoise noise(0.1);
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double result = noise.get1d(1.1, 1.0);
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ASSERT_EQ(0, noise.calls);
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EXPECT_DOUBLE_EQ(0.0, result);
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}
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TEST(FractalNoise, SingleStep)
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{
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TestFractalNoise noise(0.1);
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double result = noise.get1d(0.7, 1.0);
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ASSERT_EQ(1, noise.calls);
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EXPECT_DOUBLE_EQ(1.1, result);
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}
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TEST(FractalNoise, Sum2Steps)
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{
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TestFractalNoise noise(0.1);
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double result = noise.get1d(0.3, 1.0);
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ASSERT_EQ(2, noise.calls);
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EXPECT_DOUBLE_EQ(1.1 + 1.05, result);
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}
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TEST(FractalNoise, Sum3Steps)
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{
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TestFractalNoise noise(0.1);
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double result = noise.get1d(0.2, 1.0);
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ASSERT_EQ(3, noise.calls);
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EXPECT_DOUBLE_EQ(1.1 + 1.05 + 1.025, result);
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}
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TEST(FractalNoise, InitialScaling)
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{
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TestFractalNoise noise(0.8);
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noise.setScaling(0.5);
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double result = noise.get1d(0.2, 1.0);
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ASSERT_EQ(2, noise.calls);
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EXPECT_DOUBLE_EQ(1.4 + 1.2, result);
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}
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TEST(FractalNoise, InitialHeight)
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{
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TestFractalNoise noise(0.8);
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noise.setScaling(1.0, 0.5);
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double result = noise.get1d(0.2, 1.0);
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ASSERT_EQ(2, noise.calls);
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EXPECT_DOUBLE_EQ(0.9 + 0.7, result);
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}
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TEST(FractalNoise, InitialScalingAndHeight)
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{
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TestFractalNoise noise(0.8);
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noise.setScaling(0.5, 0.5);
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double result = noise.get1d(0.1, 1.0);
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ASSERT_EQ(2, noise.calls);
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EXPECT_DOUBLE_EQ(0.7 + 0.6, result);
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}
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TEST(FractalNoise, StepScaling)
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{
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TestFractalNoise noise(0.1);
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noise.setStep(0.8);
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double result = noise.get1d(0.55, 1.0);
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ASSERT_EQ(3, noise.calls);
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EXPECT_DOUBLE_EQ(1.1 + 1.08 + 1.064, result);
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}
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TEST(FractalNoise, StepHeight)
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{
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TestFractalNoise noise(0.1);
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noise.setStep(0.5, 0.8);
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double result = noise.get1d(0.4, 1.0);
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ASSERT_EQ(2, noise.calls);
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EXPECT_DOUBLE_EQ(1.1 + 0.84, result);
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}
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TEST(FractalNoise, StepScalingAndHeight)
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{
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TestFractalNoise noise(0.8);
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noise.setStep(0.5, 0.5);
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double result = noise.get1d(0.05, 1.0);
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ASSERT_EQ(3, noise.calls);
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EXPECT_DOUBLE_EQ(1.8 + 0.7 + 0.3, result);
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}
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TEST(FractalNoise, Noise2d)
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{
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TestFractalNoise noise(0.8);
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double result = noise.get2d(0.4, 1.0, 0.5);
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ASSERT_EQ(2, noise.calls);
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EXPECT_DOUBLE_EQ(2.3 + 1.9, result);
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}
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TEST(FractalNoise, Noise3d)
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{
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TestFractalNoise noise(0.8);
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double result = noise.get3d(0.4, 1.0, 0.5, 0.3);
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ASSERT_EQ(2, noise.calls);
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EXPECT_DOUBLE_EQ(2.6 + 2.2, result);
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}
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@ -51,6 +51,9 @@ static void _render_quad_checker(SoftwareRenderer &renderer)
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TEST(Render, quad)
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{
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#ifndef TESTS_FULL
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return;
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#endif
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SoftwareRenderer renderer;
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renderer.render_camera->setLocationCoords(0.0, 0.5, 2.0);
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TEST(Render, quad_cut)
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{
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#ifndef TESTS_FULL
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return;
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#endif
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SoftwareRenderer renderer;
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renderer.render_camera->setLocationCoords(0.8, 0.7, 1.0);
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@ -18,7 +18,8 @@ SOURCES += main.cpp \
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Camera_Test.cpp \
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Clouds_Test.cpp \
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FluidMediumManager_Test.cpp \
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VertexArray_Test.cpp
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VertexArray_Test.cpp \
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FractalNoise_Test.cpp
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HEADERS += \
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BaseTestCase.h
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