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added integer seed to noise function, use it in multi-octave noises

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This commit is contained in:
Sean Barrett 2019-02-07 04:59:05 -08:00
parent ca980dd2dc
commit cc53512cb9
1 changed files with 20 additions and 2 deletions
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22
stb_perlin.h
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@ -32,6 +32,19 @@
// details of the implementation, even if you ask for larger or no
// wrapping.)
//
// float stb_perlin_noise3_seed( float x,
// float y,
// float z,
// int x_wrap=0,
// int y_wrap=0,
// int z_wrap=0,
// int seed)
//
// As above, but 'seed' selects from multiple different variations of the
// noise function. The current implementation only uses the bottom 8 bits
// of 'seed', but possibly in the future more bits will be used.
//
//
// Fractal Noise:
//
// Three common fractal noise functions are included, which produce
@ -252,6 +265,11 @@ float stb_perlin_noise3(float x, float y, float z, int x_wrap, int y_wrap, int z
return stb_perlin_noise3_internal(x,y,z,x_wrap,y_wrap,z_wrap,0);
}
float stb_perlin_noise3_seed(float x, float y, float z, int x_wrap, int y_wrap, int z_wrap, int seed)
{
return stb_perlin_noise3_internal(x,y,z,x_wrap,y_wrap,z_wrap, (unsigned char) seed);
}
float stb_perlin_ridge_noise3(float x, float y, float z, float lacunarity, float gain, float offset, int octaves)
{
int i;
@ -262,7 +280,7 @@ float stb_perlin_ridge_noise3(float x, float y, float z, float lacunarity, float
for (i = 0; i < octaves; i++) {
float r = stb_perlin_noise3_internal(x*frequency,y*frequency,z*frequency,0,0,0,(unsigned char)i);
r = offset - fabs(r);
r = offset - (float) fabs(r);
r = r*r;
sum += r*amplitude*prev;
prev = r;
@ -296,7 +314,7 @@ float stb_perlin_turbulence_noise3(float x, float y, float z, float lacunarity,
for (i = 0; i < octaves; i++) {
float r = stb_perlin_noise3_internal(x*frequency,y*frequency,z*frequency,0,0,0,(unsigned char)i)*amplitude;
sum += fabs(r);
sum += (float) fabs(r);
frequency *= lacunarity;
amplitude *= gain;
}