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/* A program to test any mode for linear. Default mode is G640x480x256 = 10
** or parameters may be used giving modes as integers.
** linp [mode mode ...]
** Don Secrest Oct. 1998
*/
#include <vga.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
static void screen(int mode)
{
int bpp,bott,endp,linlen,i,j,bii,col,p;
vga_modeinfo *minf;
unsigned char *vbuf;
int mem;
if(mode == 0)
{
printf("Usage:linp [mode mode ...]\n
where mode is an integer.\n");
return;
}
if(! vga_hasmode(mode)) {
printf("Invalid mode %d\n",mode);
return;
}
vga_setmode(mode);
minf = vga_getmodeinfo(mode);
if(! (minf->flags & CAPABLE_LINEAR)){
vga_setmode(TEXT);
printf("The mode %d is not capable of linear\n",mode);
return;
}
vga_setpage(0);
if(vga_setlinearaddressing() == -1) {
vga_setmode(TEXT);
printf("Could not set linear addressing for mode %d\n",mode);
return;
}
bpp = minf->bytesperpixel;
linlen = minf->width*bpp;
bott = linlen*17; /* pointer 17 pixels wide. */
endp = linlen*minf->height;
mem = minf->linewidth*minf->height;
/* Do random pixels */
vbuf = vga_getgraphmem();
printf("Memory mapped to %08x. Mode = %d.\n",(int) vbuf,mode);
memset(vbuf,0,mem); /* Clear out 2 megabytes of memory, */
for(i = 0;i < 100000;i++)
{
p = rand() % mem-2;
*(vbuf + p) = rand() & 0xff;
if(bpp > 1)
*(vbuf + p + 1) = rand() & 0xff;
if(bpp == 3)
*(vbuf + p + 2) = rand() & 0xff;
}
/* Place marker at top left and bottem right. */
for(i = 0;i < 44;i += bpp) {
*(vbuf + i) = 0x60;
*(vbuf + bott + i) = 0x60;
*(vbuf + endp - i) = 0x60;
bii = endp -1 -bott;
*(vbuf + bii -i) = 0x60;
if(bpp > 1) {
*(vbuf + i + 1) = 0x60;
*(vbuf + i + 1 + bott) = 0x60;
*(vbuf - i - 1 + endp) = 0x60;
*(vbuf - i - 1 + bii) = 0x60;
}
if(bpp == 3) {
*(vbuf + i + 2) = 0x60;
*(vbuf + i + 2 + bott) = 0x60;
*(vbuf - i - 2 + endp) = 0x60;
*(vbuf - i - 2 + bii) = 0x60;
}
col = (i == 0 || i >= 42)? 0x60:0;
for(j = 1;j < 17;j++) {
*(vbuf + i + linlen*j) = col;
*(vbuf - i + endp -1 - linlen*j) = col;
if(bpp > 1) {
*(vbuf + i + 1 + linlen*j) = col;
*(vbuf - i - 2 + endp - linlen*j) = col;
}
if(bpp == 3) {
*(vbuf + i + 2 + linlen*j) = col;
*(vbuf - i - 3 + endp - linlen*j) = col;
}
}
}
for(i = 5;i < 12;i += bpp)
for(j = 4;j < 12;j++) {
*(vbuf + i + linlen*j) = 0x3f;
*(vbuf + endp - i - bpp - linlen*j) = 0x3f;
}
getchar(); /* Wait for a key punch */
}
int
main(int argc,char *argv[])
{
int mode,c;
vga_init();
c=1;
if(argc == 1)
screen(10); /* G640x480x256 */
else
c = 0;
while(argc > 1)
{
argc--;
c++;
if(isdigit(*argv[c]))
mode = atoi(argv[c]);
else if(*argv[c] == 'G')
mode = vga_getmodenumber(argv[c]);
else
{
printf("Unknown mode %s\n",argv[c]);
continue;
}
screen(mode);
}
vga_setmode(TEXT);
return 0;
}
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