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-rw-r--r--src/Noise.cpp288
1 files changed, 233 insertions, 55 deletions
diff --git a/src/Noise.cpp b/src/Noise.cpp
index 95a022ea3..507d05ea5 100644
--- a/src/Noise.cpp
+++ b/src/Noise.cpp
@@ -9,7 +9,7 @@
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
// Globals:
void Debug3DNoise(const NOISE_DATATYPE * a_Noise, int a_SizeX, int a_SizeY, int a_SizeZ, const AString & a_FileNameBase)
@@ -90,7 +90,7 @@ void Debug2DNoise(const NOISE_DATATYPE * a_Noise, int a_SizeX, int a_SizeY, cons
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
// cCubicCell2D:
class cCubicCell2D
@@ -239,7 +239,7 @@ void cCubicCell2D::Move(int a_NewFloorX, int a_NewFloorY)
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
// cCubicCell3D:
class cCubicCell3D
@@ -422,7 +422,7 @@ void cCubicCell3D::Move(int a_NewFloorX, int a_NewFloorY, int a_NewFloorZ)
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
// cNoise:
cNoise::cNoise(int a_Seed) :
@@ -487,8 +487,8 @@ NOISE_DATATYPE cNoise::SmoothNoise1D(int a_X) const
NOISE_DATATYPE cNoise::CubicNoise2D(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Y) const
{
- const int BaseX = FAST_FLOOR(a_X);
- const int BaseY = FAST_FLOOR(a_Y);
+ const int BaseX = FAST_FLOOR(a_X);
+ const int BaseY = FAST_FLOOR(a_Y);
const NOISE_DATATYPE points[4][4] =
{
@@ -515,74 +515,78 @@ NOISE_DATATYPE cNoise::CubicNoise2D(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Y) cons
NOISE_DATATYPE cNoise::CubicNoise3D(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Y, NOISE_DATATYPE a_Z) const
{
- const int BaseX = FAST_FLOOR(a_X);
- const int BaseY = FAST_FLOOR(a_Y);
- const int BaseZ = FAST_FLOOR(a_Z);
+ const int BaseX = FAST_FLOOR(a_X);
+ const int BaseY = FAST_FLOOR(a_Y);
+ const int BaseZ = FAST_FLOOR(a_Z);
- const NOISE_DATATYPE points1[4][4] = {
+ const NOISE_DATATYPE points1[4][4] =
+ {
{ IntNoise3D(BaseX - 1, BaseY - 1, BaseZ - 1), IntNoise3D(BaseX, BaseY - 1, BaseZ - 1), IntNoise3D(BaseX + 1, BaseY - 1, BaseZ - 1), IntNoise3D(BaseX + 2, BaseY - 1, BaseZ - 1), },
{ IntNoise3D(BaseX - 1, BaseY, BaseZ - 1), IntNoise3D(BaseX, BaseY, BaseZ - 1), IntNoise3D(BaseX + 1, BaseY, BaseZ - 1), IntNoise3D(BaseX + 2, BaseY, BaseZ - 1), },
{ IntNoise3D(BaseX - 1, BaseY + 1, BaseZ - 1), IntNoise3D(BaseX, BaseY + 1, BaseZ - 1), IntNoise3D(BaseX + 1, BaseY + 1, BaseZ - 1), IntNoise3D(BaseX + 2, BaseY + 1, BaseZ - 1), },
{ IntNoise3D(BaseX - 1, BaseY + 2, BaseZ - 1), IntNoise3D(BaseX, BaseY + 2, BaseZ - 1), IntNoise3D(BaseX + 1, BaseY + 2, BaseZ - 1), IntNoise3D(BaseX + 2, BaseY + 2, BaseZ - 1), },
};
- const NOISE_DATATYPE FracX = (a_X) - BaseX;
- const NOISE_DATATYPE x1interp1 = CubicInterpolate( points1[0][0], points1[0][1], points1[0][2], points1[0][3], FracX );
- const NOISE_DATATYPE x1interp2 = CubicInterpolate( points1[1][0], points1[1][1], points1[1][2], points1[1][3], FracX );
- const NOISE_DATATYPE x1interp3 = CubicInterpolate( points1[2][0], points1[2][1], points1[2][2], points1[2][3], FracX );
- const NOISE_DATATYPE x1interp4 = CubicInterpolate( points1[3][0], points1[3][1], points1[3][2], points1[3][3], FracX );
-
- const NOISE_DATATYPE points2[4][4] = {
- { IntNoise3D( BaseX-1, BaseY-1, BaseZ ), IntNoise3D( BaseX, BaseY-1, BaseZ ), IntNoise3D( BaseX+1, BaseY-1, BaseZ ), IntNoise3D( BaseX+2, BaseY-1, BaseZ ), },
- { IntNoise3D( BaseX-1, BaseY, BaseZ ), IntNoise3D( BaseX, BaseY, BaseZ ), IntNoise3D( BaseX+1, BaseY, BaseZ ), IntNoise3D( BaseX+2, BaseY, BaseZ ), },
- { IntNoise3D( BaseX-1, BaseY+1, BaseZ ), IntNoise3D( BaseX, BaseY+1, BaseZ ), IntNoise3D( BaseX+1, BaseY+1, BaseZ ), IntNoise3D( BaseX+2, BaseY+1, BaseZ ), },
- { IntNoise3D( BaseX-1, BaseY+2, BaseZ ), IntNoise3D( BaseX, BaseY+2, BaseZ ), IntNoise3D( BaseX+1, BaseY+2, BaseZ ), IntNoise3D( BaseX+2, BaseY+2, BaseZ ), },
+ const NOISE_DATATYPE FracX = (a_X) - BaseX;
+ const NOISE_DATATYPE x1interp1 = CubicInterpolate( points1[0][0], points1[0][1], points1[0][2], points1[0][3], FracX);
+ const NOISE_DATATYPE x1interp2 = CubicInterpolate( points1[1][0], points1[1][1], points1[1][2], points1[1][3], FracX);
+ const NOISE_DATATYPE x1interp3 = CubicInterpolate( points1[2][0], points1[2][1], points1[2][2], points1[2][3], FracX);
+ const NOISE_DATATYPE x1interp4 = CubicInterpolate( points1[3][0], points1[3][1], points1[3][2], points1[3][3], FracX);
+
+ const NOISE_DATATYPE points2[4][4] =
+ {
+ { IntNoise3D(BaseX - 1, BaseY - 1, BaseZ), IntNoise3D(BaseX, BaseY - 1, BaseZ), IntNoise3D(BaseX + 1, BaseY - 1, BaseZ), IntNoise3D(BaseX + 2, BaseY - 1, BaseZ), },
+ { IntNoise3D(BaseX - 1, BaseY, BaseZ), IntNoise3D(BaseX, BaseY, BaseZ), IntNoise3D(BaseX + 1, BaseY, BaseZ), IntNoise3D(BaseX + 2, BaseY, BaseZ), },
+ { IntNoise3D(BaseX - 1, BaseY + 1, BaseZ), IntNoise3D(BaseX, BaseY + 1, BaseZ), IntNoise3D(BaseX + 1, BaseY + 1, BaseZ), IntNoise3D(BaseX + 2, BaseY + 1, BaseZ), },
+ { IntNoise3D(BaseX - 1, BaseY + 2, BaseZ), IntNoise3D(BaseX, BaseY + 2, BaseZ), IntNoise3D(BaseX + 1, BaseY + 2, BaseZ), IntNoise3D(BaseX + 2, BaseY + 2, BaseZ), },
};
- const NOISE_DATATYPE x2interp1 = CubicInterpolate( points2[0][0], points2[0][1], points2[0][2], points2[0][3], FracX );
- const NOISE_DATATYPE x2interp2 = CubicInterpolate( points2[1][0], points2[1][1], points2[1][2], points2[1][3], FracX );
- const NOISE_DATATYPE x2interp3 = CubicInterpolate( points2[2][0], points2[2][1], points2[2][2], points2[2][3], FracX );
- const NOISE_DATATYPE x2interp4 = CubicInterpolate( points2[3][0], points2[3][1], points2[3][2], points2[3][3], FracX );
+ const NOISE_DATATYPE x2interp1 = CubicInterpolate( points2[0][0], points2[0][1], points2[0][2], points2[0][3], FracX);
+ const NOISE_DATATYPE x2interp2 = CubicInterpolate( points2[1][0], points2[1][1], points2[1][2], points2[1][3], FracX);
+ const NOISE_DATATYPE x2interp3 = CubicInterpolate( points2[2][0], points2[2][1], points2[2][2], points2[2][3], FracX);
+ const NOISE_DATATYPE x2interp4 = CubicInterpolate( points2[3][0], points2[3][1], points2[3][2], points2[3][3], FracX);
- const NOISE_DATATYPE points3[4][4] = {
- { IntNoise3D( BaseX-1, BaseY-1, BaseZ+1 ), IntNoise3D( BaseX, BaseY-1, BaseZ+1 ), IntNoise3D( BaseX+1, BaseY-1, BaseZ+1 ), IntNoise3D( BaseX+2, BaseY-1, BaseZ + 1), },
- { IntNoise3D( BaseX-1, BaseY, BaseZ+1 ), IntNoise3D( BaseX, BaseY, BaseZ+1 ), IntNoise3D( BaseX+1, BaseY, BaseZ+1 ), IntNoise3D( BaseX+2, BaseY, BaseZ + 1), },
- { IntNoise3D( BaseX-1, BaseY+1, BaseZ+1 ), IntNoise3D( BaseX, BaseY+1, BaseZ+1 ), IntNoise3D( BaseX+1, BaseY+1, BaseZ+1 ), IntNoise3D( BaseX+2, BaseY+1, BaseZ + 1), },
- { IntNoise3D( BaseX-1, BaseY+2, BaseZ+1 ), IntNoise3D( BaseX, BaseY+2, BaseZ+1 ), IntNoise3D( BaseX+1, BaseY+2, BaseZ+1 ), IntNoise3D( BaseX+2, BaseY+2, BaseZ + 1), },
+ const NOISE_DATATYPE points3[4][4] =
+ {
+ { IntNoise3D( BaseX-1, BaseY-1, BaseZ+1), IntNoise3D( BaseX, BaseY-1, BaseZ+1), IntNoise3D( BaseX+1, BaseY-1, BaseZ+1), IntNoise3D( BaseX+2, BaseY-1, BaseZ + 1), },
+ { IntNoise3D( BaseX-1, BaseY, BaseZ+1), IntNoise3D( BaseX, BaseY, BaseZ+1), IntNoise3D( BaseX+1, BaseY, BaseZ+1), IntNoise3D( BaseX+2, BaseY, BaseZ + 1), },
+ { IntNoise3D( BaseX-1, BaseY+1, BaseZ+1), IntNoise3D( BaseX, BaseY+1, BaseZ+1), IntNoise3D( BaseX+1, BaseY+1, BaseZ+1), IntNoise3D( BaseX+2, BaseY+1, BaseZ + 1), },
+ { IntNoise3D( BaseX-1, BaseY+2, BaseZ+1), IntNoise3D( BaseX, BaseY+2, BaseZ+1), IntNoise3D( BaseX+1, BaseY+2, BaseZ+1), IntNoise3D( BaseX+2, BaseY+2, BaseZ + 1), },
};
- const NOISE_DATATYPE x3interp1 = CubicInterpolate( points3[0][0], points3[0][1], points3[0][2], points3[0][3], FracX );
- const NOISE_DATATYPE x3interp2 = CubicInterpolate( points3[1][0], points3[1][1], points3[1][2], points3[1][3], FracX );
- const NOISE_DATATYPE x3interp3 = CubicInterpolate( points3[2][0], points3[2][1], points3[2][2], points3[2][3], FracX );
- const NOISE_DATATYPE x3interp4 = CubicInterpolate( points3[3][0], points3[3][1], points3[3][2], points3[3][3], FracX );
+ const NOISE_DATATYPE x3interp1 = CubicInterpolate( points3[0][0], points3[0][1], points3[0][2], points3[0][3], FracX);
+ const NOISE_DATATYPE x3interp2 = CubicInterpolate( points3[1][0], points3[1][1], points3[1][2], points3[1][3], FracX);
+ const NOISE_DATATYPE x3interp3 = CubicInterpolate( points3[2][0], points3[2][1], points3[2][2], points3[2][3], FracX);
+ const NOISE_DATATYPE x3interp4 = CubicInterpolate( points3[3][0], points3[3][1], points3[3][2], points3[3][3], FracX);
- const NOISE_DATATYPE points4[4][4] = {
- { IntNoise3D( BaseX-1, BaseY-1, BaseZ+2 ), IntNoise3D( BaseX, BaseY-1, BaseZ+2 ), IntNoise3D( BaseX+1, BaseY-1, BaseZ+2 ), IntNoise3D( BaseX+2, BaseY-1, BaseZ+2 ), },
- { IntNoise3D( BaseX-1, BaseY, BaseZ+2 ), IntNoise3D( BaseX, BaseY, BaseZ+2 ), IntNoise3D( BaseX+1, BaseY, BaseZ+2 ), IntNoise3D( BaseX+2, BaseY, BaseZ+2 ), },
- { IntNoise3D( BaseX-1, BaseY+1, BaseZ+2 ), IntNoise3D( BaseX, BaseY+1, BaseZ+2 ), IntNoise3D( BaseX+1, BaseY+1, BaseZ+2 ), IntNoise3D( BaseX+2, BaseY+1, BaseZ+2 ), },
- { IntNoise3D( BaseX-1, BaseY+2, BaseZ+2 ), IntNoise3D( BaseX, BaseY+2, BaseZ+2 ), IntNoise3D( BaseX+1, BaseY+2, BaseZ+2 ), IntNoise3D( BaseX+2, BaseY+2, BaseZ+2 ), },
+ const NOISE_DATATYPE points4[4][4] =
+ {
+ { IntNoise3D( BaseX-1, BaseY-1, BaseZ+2), IntNoise3D( BaseX, BaseY-1, BaseZ+2), IntNoise3D( BaseX+1, BaseY-1, BaseZ+2), IntNoise3D( BaseX+2, BaseY-1, BaseZ+2), },
+ { IntNoise3D( BaseX-1, BaseY, BaseZ+2), IntNoise3D( BaseX, BaseY, BaseZ+2), IntNoise3D( BaseX+1, BaseY, BaseZ+2), IntNoise3D( BaseX+2, BaseY, BaseZ+2), },
+ { IntNoise3D( BaseX-1, BaseY+1, BaseZ+2), IntNoise3D( BaseX, BaseY+1, BaseZ+2), IntNoise3D( BaseX+1, BaseY+1, BaseZ+2), IntNoise3D( BaseX+2, BaseY+1, BaseZ+2), },
+ { IntNoise3D( BaseX-1, BaseY+2, BaseZ+2), IntNoise3D( BaseX, BaseY+2, BaseZ+2), IntNoise3D( BaseX+1, BaseY+2, BaseZ+2), IntNoise3D( BaseX+2, BaseY+2, BaseZ+2), },
};
- const NOISE_DATATYPE x4interp1 = CubicInterpolate( points4[0][0], points4[0][1], points4[0][2], points4[0][3], FracX );
- const NOISE_DATATYPE x4interp2 = CubicInterpolate( points4[1][0], points4[1][1], points4[1][2], points4[1][3], FracX );
- const NOISE_DATATYPE x4interp3 = CubicInterpolate( points4[2][0], points4[2][1], points4[2][2], points4[2][3], FracX );
- const NOISE_DATATYPE x4interp4 = CubicInterpolate( points4[3][0], points4[3][1], points4[3][2], points4[3][3], FracX );
+ const NOISE_DATATYPE x4interp1 = CubicInterpolate( points4[0][0], points4[0][1], points4[0][2], points4[0][3], FracX);
+ const NOISE_DATATYPE x4interp2 = CubicInterpolate( points4[1][0], points4[1][1], points4[1][2], points4[1][3], FracX);
+ const NOISE_DATATYPE x4interp3 = CubicInterpolate( points4[2][0], points4[2][1], points4[2][2], points4[2][3], FracX);
+ const NOISE_DATATYPE x4interp4 = CubicInterpolate( points4[3][0], points4[3][1], points4[3][2], points4[3][3], FracX);
- const NOISE_DATATYPE FracY = (a_Y) - BaseY;
- const NOISE_DATATYPE yinterp1 = CubicInterpolate( x1interp1, x1interp2, x1interp3, x1interp4, FracY );
- const NOISE_DATATYPE yinterp2 = CubicInterpolate( x2interp1, x2interp2, x2interp3, x2interp4, FracY );
- const NOISE_DATATYPE yinterp3 = CubicInterpolate( x3interp1, x3interp2, x3interp3, x3interp4, FracY );
- const NOISE_DATATYPE yinterp4 = CubicInterpolate( x4interp1, x4interp2, x4interp3, x4interp4, FracY );
+ const NOISE_DATATYPE FracY = (a_Y) - BaseY;
+ const NOISE_DATATYPE yinterp1 = CubicInterpolate( x1interp1, x1interp2, x1interp3, x1interp4, FracY);
+ const NOISE_DATATYPE yinterp2 = CubicInterpolate( x2interp1, x2interp2, x2interp3, x2interp4, FracY);
+ const NOISE_DATATYPE yinterp3 = CubicInterpolate( x3interp1, x3interp2, x3interp3, x3interp4, FracY);
+ const NOISE_DATATYPE yinterp4 = CubicInterpolate( x4interp1, x4interp2, x4interp3, x4interp4, FracY);
- const NOISE_DATATYPE FracZ = (a_Z) - BaseZ;
- return CubicInterpolate( yinterp1, yinterp2, yinterp3, yinterp4, FracZ );
+ const NOISE_DATATYPE FracZ = (a_Z) - BaseZ;
+ return CubicInterpolate( yinterp1, yinterp2, yinterp3, yinterp4, FracZ);
}
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
// cCubicNoise:
#ifdef _DEBUG
@@ -608,6 +612,8 @@ void cCubicNoise::Generate2D(
NOISE_DATATYPE a_StartY, NOISE_DATATYPE a_EndY ///< Noise-space coords of the array in the Y direction
) const
{
+ ASSERT(a_SizeX > 0);
+ ASSERT(a_SizeY > 0);
ASSERT(a_SizeX < MAX_SIZE);
ASSERT(a_SizeY < MAX_SIZE);
ASSERT(a_StartX < a_EndX);
@@ -629,7 +635,7 @@ void cCubicNoise::Generate2D(
Cell.InitWorkRnds(FloorX[0], FloorY[0]);
#ifdef _DEBUG
- // Statistics on the noise-space coords:
+ // Statistics on the noise-space coords:
if (NumSameX == 1)
{
m_NumSingleX++;
@@ -780,7 +786,7 @@ void cCubicNoise::CalcFloorFrac(
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
// cPerlinNoise:
cPerlinNoise::cPerlinNoise(void) :
@@ -812,7 +818,7 @@ void cPerlinNoise::SetSeed(int a_Seed)
void cPerlinNoise::AddOctave(float a_Frequency, float a_Amplitude)
{
- m_Octaves.push_back(cOctave(m_Seed * (m_Octaves.size() + 4) * 4 + 1024, a_Frequency, a_Amplitude));
+ m_Octaves.push_back(cOctave(m_Seed * ((int)m_Octaves.size() + 4) * 4 + 1024, a_Frequency, a_Amplitude));
}
@@ -852,7 +858,7 @@ 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:
@@ -875,6 +881,7 @@ void cPerlinNoise::Generate2D(
if (ShouldFreeWorkspace)
{
delete[] a_Workspace;
+ a_Workspace = NULL;
}
}
@@ -941,6 +948,177 @@ void cPerlinNoise::Generate3D(
if (ShouldFreeWorkspace)
{
delete[] a_Workspace;
+ a_Workspace = NULL;
+ }
+}
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// 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;
+ a_Workspace = NULL;
+ }
+}
+
+
+
+
+
+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;
+ a_Workspace = NULL;
}
}