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| author | paramat <mat.gregory@virginmedia.com> | 2015-11-11 05:05:20 +0000 |
|---|---|---|
| committer | paramat <mat.gregory@virginmedia.com> | 2015-11-14 04:25:47 +0000 |
| commit | 987d6a82f639126d5d8833739499150da286bdda (patch) | |
| tree | 5e0c8386524e9ee0c097fc57eb82676f7ac799c2 /src/mapgen_fractal.cpp | |
| parent | 4434498367929f5fe67d7bf8a12e594d51b632ce (diff) | |
| download | minetest-987d6a82f639126d5d8833739499150da286bdda.tar.gz minetest-987d6a82f639126d5d8833739499150da286bdda.tar.bz2 minetest-987d6a82f639126d5d8833739499150da286bdda.zip | |
Mgfractal: Create a choice of 4 mandelbrot formulas
Diffstat (limited to 'src/mapgen_fractal.cpp')
| -rw-r--r-- | src/mapgen_fractal.cpp | 39 |
1 files changed, 34 insertions, 5 deletions
diff --git a/src/mapgen_fractal.cpp b/src/mapgen_fractal.cpp index 5eebc17b3..37ed0d86a 100644 --- a/src/mapgen_fractal.cpp +++ b/src/mapgen_fractal.cpp @@ -67,6 +67,8 @@ MapgenFractal::MapgenFractal(int mapgenid, MapgenParams *params, EmergeManager * MapgenFractalParams *sp = (MapgenFractalParams *)params->sparams; this->spflags = sp->spflags; + this->formula = sp->formula; + this->m_iterations = sp->m_iterations; this->m_scale = sp->m_scale; this->m_offset = sp->m_offset; @@ -145,6 +147,8 @@ MapgenFractalParams::MapgenFractalParams() { spflags = 0; + formula = 1; + m_iterations = 9; // Mandelbrot set only m_scale = v3f(1024.0, 256.0, 1024.0); m_offset = v3f(1.75, 0.0, 0.0); @@ -170,6 +174,8 @@ void MapgenFractalParams::readParams(const Settings *settings) { settings->getFlagStrNoEx("mgfractal_spflags", spflags, flagdesc_mapgen_fractal); + settings->getU16NoEx("mgfractal_formula", formula); + settings->getU16NoEx("mgfractal_m_iterations", m_iterations); settings->getV3FNoEx("mgfractal_m_scale", m_scale); settings->getV3FNoEx("mgfractal_m_offset", m_offset); @@ -195,6 +201,8 @@ void MapgenFractalParams::writeParams(Settings *settings) const { settings->setFlagStr("mgfractal_spflags", spflags, flagdesc_mapgen_fractal, U32_MAX); + settings->setU16("mgfractal_formula", formula); + settings->setU16("mgfractal_m_iterations", m_iterations); settings->setV3F("mgfractal_m_scale", m_scale); settings->setV3F("mgfractal_m_offset", m_offset); @@ -403,11 +411,32 @@ bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z) u16 iterations = spflags & MGFRACTAL_JULIA ? j_iterations : m_iterations; for (u16 iter = 0; iter < iterations; iter++) { - // 4D "Roundy" Mandelbrot set - float nx = ox * ox - oy * oy - oz * oz - ow * ow + cx; - float ny = 2.0f * (ox * oy + oz * ow) + cy; - float nz = 2.0f * (ox * oz + oy * ow) + cz; - float nw = 2.0f * (ox * ow + oy * oz) + cw; + float nx = 0.0f; + float ny = 0.0f; + float nz = 0.0f; + float nw = 0.0f; + + if (formula == 1) { // 4D "Roundy" Mandelbrot Set + nx = ox * ox - oy * oy - oz * oz - ow * ow + cx; + ny = 2.0f * (ox * oy + oz * ow) + cy; + nz = 2.0f * (ox * oz + oy * ow) + cz; + nw = 2.0f * (ox * ow + oy * oz) + cw; + } else if (formula == 2) { // 4D "Squarry" Mandelbrot Set + nx = ox * ox - oy * oy - oz * oz - ow * ow + cx; + ny = 2.0f * (ox * oy + oz * ow) + cy; + nz = 2.0f * (ox * oz + oy * ow) + cz; + nw = 2.0f * (ox * ow - oy * oz) + cw; + } else if (formula == 3) { // 4D "Mandy Cousin" Mandelbrot Set + nx = ox * ox - oy * oy - oz * oz + ow * ow + cx; + ny = 2.0f * (ox * oy + oz * ow) + cy; + nz = 2.0f * (ox * oz + oy * ow) + cz; + nw = 2.0f * (ox * ow + oy * oz) + cw; + } else if (formula == 4) { // 4D Mandelbrot Set Variation + nx = ox * ox - oy * oy - oz * oz - ow * ow + cx; + ny = 2.0f * (ox * oy + oz * ow) + cy; + nz = 2.0f * (ox * oz - oy * ow) + cz; + nw = 2.0f * (ox * ow + oy * oz) + cw; + } if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f) return false; |