diff options
Diffstat (limited to 'src/Noise.cpp')
| -rw-r--r-- | src/Noise.cpp | 170 |
1 files changed, 169 insertions, 1 deletions
diff --git a/src/Noise.cpp b/src/Noise.cpp index 89115d992..040421106 100644 --- a/src/Noise.cpp +++ b/src/Noise.cpp @@ -854,7 +854,7 @@ void cPerlinNoise::Generate2D( NOISE_DATATYPE Amplitude = FirstOctave.m_Amplitude; for (int i = 0; i < ArrayCount; i++) { - a_Array[i] *= Amplitude; + a_Array[i] = a_Workspace[i] * Amplitude; } // Add each octave: @@ -949,3 +949,171 @@ void cPerlinNoise::Generate3D( + +/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// +// cRidgedMultiNoise: + +cRidgedMultiNoise::cRidgedMultiNoise(void) : + m_Seed(0) +{ +} + + + + + +cRidgedMultiNoise::cRidgedMultiNoise(int a_Seed) : + m_Seed(a_Seed) +{ +} + + + + + +void cRidgedMultiNoise::SetSeed(int a_Seed) +{ + m_Seed = a_Seed; +} + + + + + +void cRidgedMultiNoise::AddOctave(float a_Frequency, float a_Amplitude) +{ + m_Octaves.push_back(cOctave(m_Seed * ((int)m_Octaves.size() + 4) * 4 + 1024, a_Frequency, a_Amplitude)); +} + + + + + +void cRidgedMultiNoise::Generate2D( + NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y] + int a_SizeX, int a_SizeY, ///< Count of the array, in each direction + NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction + NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY, ///< Noise-space coords of the array in the Y direction + NOISE_DATATYPE * a_Workspace ///< Workspace that this function can use and trash +) const +{ + if (m_Octaves.empty()) + { + // No work to be done + ASSERT(!"RidgedMulti: No octaves to generate!"); + return; + } + + bool ShouldFreeWorkspace = (a_Workspace == NULL); + int ArrayCount = a_SizeX * a_SizeY; + if (ShouldFreeWorkspace) + { + a_Workspace = new NOISE_DATATYPE[ArrayCount]; + } + + // Generate the first octave directly into array: + const cOctave & FirstOctave = m_Octaves.front(); + + FirstOctave.m_Noise.Generate2D( + a_Workspace, a_SizeX, a_SizeY, + a_StartX * FirstOctave.m_Frequency, a_EndX * FirstOctave.m_Frequency, + a_StartY * FirstOctave.m_Frequency, a_EndY * FirstOctave.m_Frequency + ); + NOISE_DATATYPE Amplitude = FirstOctave.m_Amplitude; + for (int i = 0; i < ArrayCount; i++) + { + a_Array[i] = fabs(a_Workspace[i] * Amplitude); + } + + // Add each octave: + for (cOctaves::const_iterator itr = m_Octaves.begin() + 1, end = m_Octaves.end(); itr != end; ++itr) + { + // Generate cubic noise for the octave: + itr->m_Noise.Generate2D( + a_Workspace, a_SizeX, a_SizeY, + a_StartX * itr->m_Frequency, a_EndX * itr->m_Frequency, + a_StartY * itr->m_Frequency, a_EndY * itr->m_Frequency + ); + // Add the cubic noise into the output: + NOISE_DATATYPE Amplitude = itr->m_Amplitude; + for (int i = 0; i < ArrayCount; i++) + { + a_Array[i] += fabs(a_Workspace[i] * Amplitude); + } + } + + if (ShouldFreeWorkspace) + { + delete[] a_Workspace; + } +} + + + + + +void cRidgedMultiNoise::Generate3D( + NOISE_DATATYPE * a_Array, ///< Array to generate into [x + a_SizeX * y + a_SizeX * a_SizeY * z] + int a_SizeX, int a_SizeY, int a_SizeZ, ///< Count of the array, in each direction + NOISE_DATATYPE a_StartX, NOISE_DATATYPE a_EndX, ///< Noise-space coords of the array in the X direction + NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY, ///< Noise-space coords of the array in the Y direction + NOISE_DATATYPE a_StartZ, NOISE_DATATYPE a_EndZ, ///< Noise-space coords of the array in the Z direction + NOISE_DATATYPE * a_Workspace ///< Workspace that this function can use and trash +) const +{ + if (m_Octaves.empty()) + { + // No work to be done + ASSERT(!"RidgedMulti: No octaves to generate!"); + return; + } + + bool ShouldFreeWorkspace = (a_Workspace == NULL); + int ArrayCount = a_SizeX * a_SizeY * a_SizeZ; + if (ShouldFreeWorkspace) + { + a_Workspace = new NOISE_DATATYPE[ArrayCount]; + } + + // Generate the first octave directly into array: + const cOctave & FirstOctave = m_Octaves.front(); + + FirstOctave.m_Noise.Generate3D( + a_Workspace, a_SizeX, a_SizeY, a_SizeZ, + a_StartX * FirstOctave.m_Frequency, a_EndX * FirstOctave.m_Frequency, + a_StartY * FirstOctave.m_Frequency, a_EndY * FirstOctave.m_Frequency, + a_StartZ * FirstOctave.m_Frequency, a_EndZ * FirstOctave.m_Frequency + ); + NOISE_DATATYPE Amplitude = FirstOctave.m_Amplitude; + for (int i = 0; i < ArrayCount; i++) + { + a_Array[i] = a_Workspace[i] * Amplitude; + } + + // Add each octave: + for (cOctaves::const_iterator itr = m_Octaves.begin() + 1, end = m_Octaves.end(); itr != end; ++itr) + { + // Generate cubic noise for the octave: + itr->m_Noise.Generate3D( + a_Workspace, a_SizeX, a_SizeY, a_SizeZ, + a_StartX * itr->m_Frequency, a_EndX * itr->m_Frequency, + a_StartY * itr->m_Frequency, a_EndY * itr->m_Frequency, + a_StartZ * itr->m_Frequency, a_EndZ * itr->m_Frequency + ); + // Add the cubic noise into the output: + NOISE_DATATYPE Amplitude = itr->m_Amplitude; + for (int i = 0; i < ArrayCount; i++) + { + a_Array[i] += a_Workspace[i] * Amplitude; + } + } + + if (ShouldFreeWorkspace) + { + delete[] a_Workspace; + } +} + + + + |