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(svn r27008) -Change: extrapolate the amplitudes for the large wavelengths needed for much higher maps

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rubidium 2014-10-13 14:16:20 +00:00
parent cb64738f4c
commit 1d685c9711
1 changed files with 28 additions and 2 deletions
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30
src/tgp.cpp
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@ -205,7 +205,7 @@ static HeightMap _height_map = {NULL, 0, 0, 0, 0};
#define FOR_ALL_TILES_IN_HEIGHT(h) for (h = _height_map.h; h < &_height_map.h[_height_map.total_size]; h++)
/** Maximum number of TGP noise frequencies. */
static const int MAX_TGP_FREQUENCIES = 7;
static const int MAX_TGP_FREQUENCIES = 10;
/** Desired water percentage (100% == 1024) - indexed by _settings_game.difficulty.quantity_sea_lakes */
static const amplitude_t _water_percent[4] = {20, 80, 250, 400};
@ -255,9 +255,35 @@ static amplitude_t GetAmplitude(int frequency)
{32000, 19200, 12800, 8000, 3200, 256, 64}, ///< Rough
{48000, 24000, 19200, 16000, 8000, 512, 320}, ///< Very rough
};
/*
* Extrapolation factors for ranges before the table.
* The extrapolation is needed to account for the higher map heights. They need larger
* areas with a particular gradient so that we are able to create maps without too
* many steep slopes up to the wanted height level. It's definitely not perfect since
* it will bring larger rectangles with similar slopes which makes the rectangular
* behaviour of TGP more noticable. However, these height differentiations cannot
* happen over much smaller areas; we basically double the "range" to give a similar
* slope for every doubling of map height.
*/
static const double extrapolation_factors[] = { 3.3, 2.8, 2.3, 1.8 };
int smoothness = _settings_game.game_creation.tgen_smoothness;
return amplitudes[smoothness][frequency];
/* Get the table index, and return that value if possible. */
int index = frequency - MAX_TGP_FREQUENCIES + lengthof(amplitudes[smoothness]);
amplitude_t amplitude = amplitudes[smoothness][max(0, index)];
if (index >= 0) return amplitude;
/* We need to extrapolate the amplitude. */
double extrapolation_factor = extrapolation_factors[smoothness];
int height_range = 16;
do {
amplitude = (amplitude_t)(extrapolation_factor * (double)amplitude);
height_range <<= 1;
index++;
} while (index < 0);
return Clamp((TGPGetMaxHeight() - height_range) / height_range, 0, 1) * amplitude;
}
/**