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Add more image generation functions: radial gradient and perlin noise

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Wilhem Barbier
2017-06-28 15:29:56 +02:00
parent fcd13fd5d2
commit a0ac8ee2c4
5 changed files with 381 additions and 4 deletions
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55
src/textures.c
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@ -68,6 +68,9 @@
#include "utils.h" // Required for: fopen() Android mapping
#define STB_PERLIN_IMPLEMENTATION
#include "external/stb_perlin.h"// Required for: stb_perlin_fbm_noise3
// Support only desired texture formats on stb_image
#if !defined(SUPPORT_FILEFORMAT_BMP)
#define STBI_NO_BMP
@ -1477,6 +1480,34 @@ Image GenImageGradientH(int width, int height, Color left, Color right)
return image;
}
// Generate image: radial gradient
Image GenImageRadialGradient(int width, int height, Color inner, Color outer)
{
Color *pixels = (Color*)malloc(width * height * sizeof(Color));
float radius = (width < height) ? (float)width / 2.f : (float)height / 2.f;
float center_x = (float)width / 2.f;
float center_y = (float)height / 2.f;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
float dist = hypotf((float)x - center_x, (float)y - center_y);
float factor = dist / radius;
factor = fmin(factor, 1.f); // dist can be bigger than radius so we have to check
pixels[y*width + x].r = (int)((float)outer.r * factor + (float)inner.r * (1.f - factor));
pixels[y*width + x].g = (int)((float)outer.g * factor + (float)inner.g * (1.f - factor));
pixels[y*width + x].b = (int)((float)outer.b * factor + (float)inner.b * (1.f - factor));
pixels[y*width + x].a = (int)((float)outer.a * factor + (float)inner.a * (1.f - factor));
}
}
Image image = LoadImageEx(pixels, width, height);
free(pixels);
return image;
}
// Generate image: checked
Image GenImageChecked(int width, int height, int checksX, int checksY, Color col1, Color col2)
{
@ -1514,6 +1545,30 @@ Image GenImageWhiteNoise(int width, int height, float factor)
return image;
}
// Generate image: perlin noise
Image GenImagePerlinNoise(int width, int height, float scale)
{
Color *pixels = (Color*)malloc(width * height * sizeof(Color));
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
float nx = (float)x * scale / (float)width;
float ny = (float)y * scale / (float)height;
// we need to translate the data from [-1; 1] to [0; 1]
float p = (stb_perlin_fbm_noise3(nx, ny, 1.f, 2.f, 0.5f, 6, 0, 0, 0) + 1.f) / 2.f;
int intensity = (int)(p * 255.f);
pixels[y*width + x] = (Color){intensity, intensity, intensity, 255};
}
}
Image image = LoadImageEx(pixels, width, height);
free(pixels);
return image;
}
// Generate image: cellular algorithm. Bigger tileSize means bigger cells
Image GenImageCellular(int width, int height, int tileSize)
{