diff options
Diffstat (limited to 'src/textures.c')
| -rw-r--r-- | src/textures.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/textures.c b/src/textures.c index 99392516..be089a93 100644 --- a/src/textures.c +++ b/src/textures.c @@ -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) { |