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Added examples/wgt46.c to exercise whline()
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part12-wgt/examples/wgt46.c
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90
part12-wgt/examples/wgt46.c
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#include "wgt.h"
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#include "include/mem.h"
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// ######## REQUIRED FUNCTIONS ########
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unsigned long state0 = 1000;
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unsigned long state1 = 2000;
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unsigned long rand(void)
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{
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unsigned long s1 = state0;
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unsigned long s0 = state1;
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state0 = s0;
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s1 ^= s1 << 23;
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s1 ^= s1 >> 17;
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s1 ^= s0;
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s1 ^= s0 >> 26;
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state1 = s1;
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return state0 + state1;
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}
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void wait_msec(unsigned int n)
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{
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register unsigned long f, t, r;
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// Get the current counter frequency
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asm volatile ("mrs %0, cntfrq_el0" : "=r"(f));
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// Read the current counter
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asm volatile ("mrs %0, cntpct_el0" : "=r"(t));
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// Calculate expire value for counter
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t+=((f/1000)*n)/1000;
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do{asm volatile ("mrs %0, cntpct_el0" : "=r"(r));}while(r<t);
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}
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// ######## STUB FUNCTIONS ########
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unsigned int kb = 0;
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unsigned int kbhit(void) {
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kb++;
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return kb / 500;
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}
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void getch(void) {
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wait_msec(0x500000);
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kb = 0;
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}
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// ######## WGT EXAMPLES ########
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int loopctr;
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void timerctr(void)
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{
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loopctr++;
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}
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void wgt46()
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{
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short row;
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set_clock_rate(get_max_clock());
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mem_init();
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vga256 (); /* Initializes WGT system */
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wcls (vgapal[0]); /* Clear screen with color 0 */
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row = 0; /* Start drawing at top row of screen */
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loopctr = 0;
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winittimer ();
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wstarttimer (timerctr, 100); /* Set timer to 100th of a second accuracy */
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do {
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wsetcolor (vgapal[rand () % 256]); /* Pick a random color */
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whline (0, 319, row++); /* Draw the line */
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if (row > 199) /* Loop at end of screen */
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row = 0;
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} while (loopctr < 500);
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/* As soon as we reach 500 hundredths of a second (5 secs), end the routine
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and reset the video mode */
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wstoptimer ();
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wdonetimer ();
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}
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void main()
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{
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wgt46();
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while (1);
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}
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