mirror of
https://github.com/isometimes/rpi4-osdev
synced 2024-11-12 13:20:39 +00:00
97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
#include "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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// ######## 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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void wgt29()
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{
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color p[256]; /* Our palette */
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block sprites[1001]; /* Pointers to blocks */
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char *scrolltext="THIS IS A SMALL TEXT SCROLLER CREATED WITH THE WCOPYSCREEN COMMAND. PRESS A KEY TO END THIS SCROLLER... ";
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int scrnum; /* Counter for current letter of scroller */
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int nextlet, i, j; /* Counters */
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set_clock_rate(get_max_clock());
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mem_init();
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vga256 (); /* Initialize graphics mode */
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for (i = 0; i < 180; i++) /* Draws a background for the screen */
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{
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wsetcolor (vgapal[i]);
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wline (0, 0, 319, i);
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wline (319, 199, 0, 180 - i);
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}
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wsetcolor (vgapal[0]); /* Draw with black */
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wbar (0, 189, 319, 199); /* Clear area off bottom for scroller */
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extern unsigned char _binary_bin_letters_spr_start[];
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unsigned char *lettersspr = &_binary_bin_letters_spr_start[0];
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wloadsprites (p, lettersspr, sprites, 0, 1000); // Load our blocks
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do {
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scrnum = 0; /* Start at first character of scroller string */
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do {
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/* Find pixel width of current letter in string */
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nextlet = wgetblockwidth (sprites[scrolltext[scrnum] + 1]);
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for (j = 0; j <= nextlet + 1; j += 2)
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{
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wbar (318, 189, 319, 199); /* Erase right-hand side of scroller area */
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/* Now copy the last letter on at the end of the string */
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wputblock (319 - j, 189, sprites[scrolltext[scrnum] + 1], 0);
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/* Wait for monitor to finish vertical retrace */
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wait_msec(0x3E9F); // Ugly - this needs to sync better... could use the timer I suppose... NITV!
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/* Shift scroller to the left */
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wcopyscreen (2, 189, 319, 199, NULL, 0, 189, NULL);
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}
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scrnum++; /* Advance to next letter */
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} while (scrolltext[scrnum + 1] != 0);
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} while (1);
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wfreesprites (sprites, 0, 1000); /* Free our sprites */
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}
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void main()
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{
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wgt29();
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while (1);
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}
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