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REVIEWED: `GenImagePerlinNoise()`, no change

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Ray 2023-05-21 00:14:09 +02:00
parent 51387dfbfb
commit f31df7521a
1 changed files with 12 additions and 7 deletions
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19
src/rtextures.c
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@ -833,18 +833,23 @@ Image GenImagePerlinNoise(int width, int height, int offsetX, int offsetY, float
{
for (int x = 0; x < width; x++)
{
float nx = (float)(x + offsetX)*scale/(float)width;
float ny = (float)(y + offsetY)*scale/(float)height;
float nx = (float)(x + offsetX)*(scale/(float)width);
float ny = (float)(y + offsetY)*(scale/(float)height);
// Basic perlin noise implementation (not used)
//float p = (stb_perlin_noise3(nx, ny, 0.0f, 0, 0, 0);
// Calculate a better perlin noise using fbm (fractal brownian motion)
// Typical values to start playing with:
// lacunarity = ~2.0 -- spacing between successive octaves (use exactly 2.0 for wrapping output)
// gain = 0.5 -- relative weighting applied to each successive octave
// octaves = 6 -- number of "octaves" of noise3() to sum
float p = stb_perlin_fbm_noise3(nx, ny, 1.0f, 2.0f, 0.5f, 6);
// We need to normalize the data from [-1..1] to [0..1]
float np = (p + 1.0f)/2.0f;
// NOTE: We need to translate the data from [-1..1] to [0..1]
float p = (stb_perlin_fbm_noise3(nx, ny, 1.0f, 2.0f, 0.5f, 6) + 1.0f)/2.0f;
int intensity = (int)(p*255.0f);
int intensity = (int)(np*255.0f);
pixels[y*width + x] = (Color){ intensity, intensity, intensity, 255 };
}
}