minifb-zig-port/tests/noise.c

#include <MiniFB.h>
#include <stdio.h>
#include <stdint.h>

#define WIDTH      800
#define HEIGHT     600
static unsigned int g_buffer[WIDTH * HEIGHT];

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

int main()
{
    int noise, carry, seed = 0xbeef;

    struct Window *window = mfb_open_ex("Noise Test", WIDTH, HEIGHT, WF_RESIZABLE);
    if (!window)
        return 0;

    for (;;)
    {
        int         i;
        UpdateState state;

        for (i = 0; i < WIDTH * HEIGHT; ++i)
        {
            noise = seed;
            noise >>= 3;
            noise ^= seed;
            carry = noise & 1;
            noise >>= 1;
            seed >>= 1;
            seed |= (carry << 30);
            noise &= 0xFF;
            g_buffer[i] = MFB_RGB(noise, noise, noise); 
        }

        state = mfb_update(window, g_buffer);
        if (state != STATE_OK) {
            window = 0x0;
            break;
        }
    }

    return 0;
}