diff options
| -rw-r--r-- | src/tgp.cpp | 57 |
1 files changed, 46 insertions, 11 deletions
diff --git a/src/tgp.cpp b/src/tgp.cpp index ffc3edc51..8177b5720 100644 --- a/src/tgp.cpp +++ b/src/tgp.cpp @@ -248,16 +248,41 @@ static height_t TGPGetMaxHeight() */ static amplitude_t GetAmplitude(int frequency) { - /* Base noise amplitudes (multiplied by 1024) and indexed by "smoothness setting" and log2(frequency). */ - static const amplitude_t amplitudes[][7] = { + /* Base noise amplitudes (multiplied by 1024) and indexed by "smoothness setting" and log2(frequency). + * Used for maps that have their smallest side smaller than 512. */ + static const amplitude_t amplitudes_small[][10] = { /* lowest frequency ...... highest (every corner) */ - {16000, 5600, 1968, 688, 240, 16, 16}, ///< Very smooth - {24000, 12800, 6400, 2700, 1024, 128, 16}, ///< Smooth - {32000, 19200, 12800, 8000, 3200, 256, 64}, ///< Rough - {48000, 24000, 19200, 16000, 8000, 512, 320}, ///< Very rough + {60000, 2273, 4142, 2253, 421, 213, 137, 177, 37, 16}, ///< Very smooth + {50000, 2273, 4142, 2253, 421, 213, 137, 177, 37, 61}, ///< Smooth + {40000, 2273, 4142, 2253, 421, 213, 137, 177, 37, 91}, ///< Rough + {30000, 2273, 4142, 2253, 421, 213, 137, 177, 37, 161}, ///< Very rough }; - /* - * Extrapolation factors for ranges before the table. + + /* Base noise amplitudes (multiplied by 1024) and indexed by "smoothness setting" and log2(frequency). + * Used for maps that have their smallest side equal to 512. */ + static const amplitude_t amplitudes_middle[][10] = { + {55000, 2273, 5142, 253, 2421, 213, 137, 177, 37, 16}, ///< Very smooth + {45000, 2273, 5142, 253, 2421, 213, 137, 177, 37, 61}, ///< Smooth + {35000, 2273, 5142, 253, 2421, 213, 137, 177, 37, 91}, ///< Rough + {25000, 2273, 5142, 253, 2421, 213, 137, 177, 37, 161}, ///< Very rough + }; + + /* Base noise amplitudes (multiplied by 1024) and indexed by "smoothness setting" and log2(frequency). + * Used for maps that have their smallest side bigger than 512. */ + static const amplitude_t amplitudes_large[][10] = { + /* lowest frequency ...... highest (every corner) */ + {55000, 2273, 5142, 253, 421, 2213, 137, 177, 37, 16}, ///< Very smooth + {45000, 2273, 5142, 253, 421, 2213, 137, 177, 37, 61}, ///< Smooth + {35000, 2273, 5142, 253, 421, 2213, 137, 177, 37, 91}, ///< Rough + {25000, 2273, 5142, 253, 421, 2213, 137, 177, 37, 161}, ///< Very rough + }; + + /* Make sure arrays cover all smoothness settings. */ + assert_compile(lengthof(amplitudes_small) == TGEN_SMOOTHNESS_END); + assert_compile(lengthof(amplitudes_middle) == TGEN_SMOOTHNESS_END); + assert_compile(lengthof(amplitudes_large) == TGEN_SMOOTHNESS_END); + + /* 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 @@ -269,10 +294,20 @@ static amplitude_t GetAmplitude(int frequency) static const double extrapolation_factors[] = { 3.3, 2.8, 2.3, 1.8 }; int smoothness = _settings_game.game_creation.tgen_smoothness; + int smallest_size = min(_settings_game.game_creation.map_x, _settings_game.game_creation.map_y); - /* 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)]; + int index; + amplitude_t amplitude; + if (smallest_size < 9) { // Smallest map side is less than 2^9 == 512. + index = frequency - MAX_TGP_FREQUENCIES + lengthof(amplitudes_small[0]); + amplitude = amplitudes_small[smoothness][max(0, index)]; + } else if (smallest_size == 9) { + index = frequency - MAX_TGP_FREQUENCIES + lengthof(amplitudes_middle[0]); + amplitude = amplitudes_middle[smoothness][max(0, index)]; + } else { + index = frequency - MAX_TGP_FREQUENCIES + lengthof(amplitudes_large[0]); + amplitude = amplitudes_large[smoothness][max(0, index)]; + } if (index >= 0) return amplitude; /* We need to extrapolate the amplitude. */ |