mirror of
https://github.com/isometimes/rpi4-osdev
synced 2024-09-19 13:32:56 +00:00
77 lines
1.4 KiB
C
77 lines
1.4 KiB
C
#include "include/wgt.h"
|
|
#include "include/mem.h"
|
|
|
|
// ######## REQUIRED FUNCTIONS ########
|
|
|
|
unsigned long state0 = 1000;
|
|
unsigned long state1 = 2000;
|
|
|
|
unsigned long rand(void)
|
|
{
|
|
unsigned long s1 = state0;
|
|
unsigned long s0 = state1;
|
|
|
|
state0 = s0;
|
|
s1 ^= s1 << 23;
|
|
s1 ^= s1 >> 17;
|
|
s1 ^= s0;
|
|
s1 ^= s0 >> 26;
|
|
state1 = s1;
|
|
|
|
return state0 + state1;
|
|
}
|
|
|
|
// ######## STUB FUNCTIONS ########
|
|
|
|
unsigned int kb = 0;
|
|
|
|
unsigned int kbhit(void) {
|
|
kb++;
|
|
return kb / 500;
|
|
}
|
|
|
|
void getch(void) {
|
|
wait_msec(0x500000);
|
|
kb = 0;
|
|
}
|
|
|
|
// ######## WGT EXAMPLES ########
|
|
|
|
int loopctr;
|
|
|
|
void timerctr(void)
|
|
{
|
|
loopctr++;
|
|
}
|
|
|
|
void wgt46()
|
|
{
|
|
short row;
|
|
|
|
set_clock_rate(get_max_clock());
|
|
mem_init();
|
|
vga256 (); /* Initializes WGT system */
|
|
wcls (vgapal[0]); /* Clear screen with color 0 */
|
|
|
|
row = 0; /* Start drawing at top row of screen */
|
|
loopctr = 0;
|
|
winittimer ();
|
|
wstarttimer (timerctr, 100); /* Set timer to 100th of a second accuracy */
|
|
do {
|
|
wsetcolor (vgapal[rand () % 256]); /* Pick a random color */
|
|
whline (0, 319, row++); /* Draw the line */
|
|
if (row > 199) /* Loop at end of screen */
|
|
row = 0;
|
|
} while (loopctr < 500);
|
|
|
|
/* As soon as we reach 500 hundredths of a second (5 secs), end the routine
|
|
and reset the video mode */
|
|
wstoptimer ();
|
|
wdonetimer ();
|
|
}
|
|
|
|
void main()
|
|
{
|
|
wgt46();
|
|
while (1);
|
|
}
|