double* Oscillator::fillWhiteNoiseBuffer(int bufferLength)
{
_currentPhase = 0.0;
_bufferLength = bufferLength;
if(_buffer != nullptr)
delete _buffer;
_buffer = new double[_bufferLength];
for(int i = 0; i < _bufferLength; ++i)
{
_buffer[i] = generateWhiteNoise();
}
return _buffer;
}
void NoiseGenerator::generatePerlinNoise ( int seed, int width, int height ) {
this->width = width;
this->height = height;
srand(seed);
generatedNoise = getArray();
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
generatedNoise[x][y] = 0;
}
}
int numOctaves = 8;
float*** octaves = new float**[numOctaves];
for (int i = 0; i < numOctaves; i++) {
octaves[i] = new float*[width];
for (int j = 0; j < width; j++) {
octaves[i][j] = new float[height];
}
}
float** baseNoise = generateWhiteNoise();
for (int i = 0; i < numOctaves; i++) {
octaves[i] = generateSmoothNoise(baseNoise, i);
}
float amplitude = 1.0f;
float totalAmplitude = 0.0f;
float persistence = 0.5f;
for (int i = numOctaves - 1; i >= 0; i--) {
amplitude *= persistence;
totalAmplitude += amplitude;
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
generatedNoise[x][y] += octaves[i][x][y] * amplitude;
}
}
}
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
generatedNoise[x][y] /= totalAmplitude;
}
}
}
