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Added cOctavedNoise template.

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This allows us to use any noise generator in the combination of octaves.
This commit is contained in:
Mattes D
2014-11-17 23:02:53 +01:00
parent faf0ce3d7f
commit e9082263c9
3 changed files with 206 additions and 258 deletions
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174
src/Noise.cpp
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@@ -1043,10 +1043,6 @@ NOISE_DATATYPE cImprovedNoise::GetValueAt(int a_X, int a_Y, int a_Z)
a_Z = a_Z & 255;
int A = m_Perm[a_X] + a_Y;
int AA = m_Perm[A] + a_Z;
int AB = m_Perm[A + 1] + a_Z;
int B = m_Perm[a_X + 1] + a_Y;
int BA = m_Perm[B] + a_Z;
int BB = m_Perm[B + 1] + a_Z;
return Grad(m_Perm[AA], 0, 0, 0);
}
@@ -1055,176 +1051,6 @@ NOISE_DATATYPE cImprovedNoise::GetValueAt(int a_X, int a_Y, int a_Z)
////////////////////////////////////////////////////////////////////////////////
// cPerlinNoise:
cPerlinNoise::cPerlinNoise(void) :
m_Seed(0)
{
}
cPerlinNoise::cPerlinNoise(int a_Seed) :
m_Seed(a_Seed)
{
}
void cPerlinNoise::SetSeed(int a_Seed)
{
m_Seed = a_Seed;
}
void cPerlinNoise::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 cPerlinNoise::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(!"Perlin: No octaves to generate!");
return;
}
bool ShouldFreeWorkspace = (a_Workspace == nullptr);
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] = 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] += a_Workspace[i] * Amplitude;
}
}
if (ShouldFreeWorkspace)
{
delete[] a_Workspace;
a_Workspace = nullptr;
}
}
void cPerlinNoise::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(!"Perlin: No octaves to generate!");
return;
}
bool ShouldFreeWorkspace = (a_Workspace == nullptr);
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;
a_Workspace = nullptr;
}
}
////////////////////////////////////////////////////////////////////////////////
// cRidgedMultiNoise: