81 lines
1.4 KiB
C
81 lines
1.4 KiB
C
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/*
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* pelette - manipulate text colormap for NetBSD/x68k.
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* author: Masaru Oki
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*
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* This software is in the Public Domain.
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*/
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#include <stdio.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/fcntl.h>
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#define PALETTE_OFFSET 0x2000 /* physical addr: 0xe82000 */
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#define PALETTE_SIZE 0x1000 /* at least 1 page */
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int fd;
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u_short *palette;
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char *mapaddr;
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int r, g, b;
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int c = 7;
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#ifdef DEBUG
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{
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int i;
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printf("argc = %d\n", argc);
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for (i = 0; i < argc; i++)
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printf("argv[%d] = \"%s\"\n", i, argv[i]);
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}
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#endif
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if ((fd = open("/dev/grf0", O_RDWR, 0)) < 0) {
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perror("open");
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exit(1);
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}
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mapaddr = mmap(0, PALETTE_SIZE, PROT_READ | PROT_WRITE,
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MAP_FILE | MAP_SHARED, fd, PALETTE_OFFSET);
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if (mapaddr == (caddr_t)-1) {
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perror("mmap");
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close(fd);
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exit(1);
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}
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close(fd);
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palette = (u_short *)(mapaddr + 0x0200);
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if (argc == 5) {
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c = atoi(argv[--argc]);
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if (c > 15) {
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printf("Usage: %s [red green blue [code]]\n", argv[0]);
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exit(1);
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}
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}
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if (argc != 4)
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r = g = b = 31;
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else {
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r = atoi(argv[1]);
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g = atoi(argv[2]);
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b = atoi(argv[3]);
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if (r > 31 || g > 31 || b > 31) {
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printf("Usage: %s [red green blue [code]]\n", argv[0]);
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r = g = b = 31;
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}
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}
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#ifdef DEBUG
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printf("color table offset = %d\n", c);
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printf("r = %d, g = %d, b = %d\n", r, g, b);
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#endif
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r <<= 6;
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g <<= 11;
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b <<= 1;
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palette[c] = r | g | b | 1;
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exit(0);
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}
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