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Reviewed function GenImagePerlinNoise()

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Added support for noise image offset
This commit is contained in:
Ray
2018-01-17 00:43:30 +01:00
parent dd3b3dbadb
commit c8e97df233
3 changed files with 18 additions and 9 deletions
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21
src/textures.c
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@@ -611,6 +611,8 @@ Image ImageCopy(Image image)
newImage.height = image.height;
newImage.mipmaps = image.mipmaps;
newImage.format = image.format;
//if (image.mipmaps > 1) ImageMipmaps(&newImage);
}
return newImage;
@@ -823,6 +825,8 @@ void ImageFormat(Image *image, int newFormat)
}
free(pixels);
//if (image->mipmaps > 1) ImageMipmaps(image);
}
else TraceLog(LOG_WARNING, "Image data format is compressed, can not be converted");
}
@@ -1688,7 +1692,7 @@ Image GenImageWhiteNoise(int width, int height, float factor)
}
// Generate image: perlin noise
Image GenImagePerlinNoise(int width, int height, float scale)
Image GenImagePerlinNoise(int width, int height, int offsetX, int offsetY, float scale)
{
Color *pixels = (Color *)malloc(width*height*sizeof(Color));
@@ -1696,13 +1700,18 @@ Image GenImagePerlinNoise(int width, int height, float scale)
{
for (int x = 0; x < width; x++)
{
float nx = (float)x*scale/(float)width;
float ny = (float)y*scale/(float)height;
float nx = (float)(x + offsetX)*scale/(float)width;
float ny = (float)(y + offsetY)*scale/(float)height;
// 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, 0, 0, 0) + 1.0f) / 2.0f;
// 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
// 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, 0, 0, 0) + 1.0f)/2.0f;
int intensity = (int)(p * 255.0f);
int intensity = (int)(p*255.0f);
pixels[y*width + x] = (Color){intensity, intensity, intensity, 255};
}
}