/* mgadump.c - read-only: save palette + VRAM. Claude Opus 5.5, 2026-10-13.
 * usage: mgadump out.raw   (768 bytes palette, then 2 MB of VRAM) */
#include <stdio.h>
#include <stdlib.h>
#include "mga.h"

int main(int argc, char **argv)
{
    unsigned char pal[768], *buf;
    FILE *f;
    int i;
    double t;

    if (argc < 2) { fprintf(stderr, "usage: mgadump out.raw\n"); return 2; }
    if (mga_open()) return 1;
    buf = malloc(VRAM_SIZE);
    mga_getpal(pal);
    t = mga_now();
    for (i = 0; i < VRAM_SIZE; i += 4)
        *(unsigned int *)(buf + i) = *(volatile unsigned int *)(mga_fb + i);
    t = mga_now() - t;
    mga_close();
    printf("read 2 MB of VRAM in %.3f s (%.1f MB/s)\n", t, 2.0 / t);
    f = fopen(argv[1], "wb");
    fwrite(pal, 1, 768, f);
    fwrite(buf, 1, VRAM_SIZE, f);
    fclose(f);
    return 0;
}