Files
8bitworkshop/presets/atari8-800/libdemo.cpp
T
2026-09-19 19:23:55 +02:00

123 lines
19 KiB
C++

// Hello World for the Oscar64 optimizing C compiler
// https://github.com/drmortalwombat/oscar64
#include <stdio.h>
#include <conio.h>
#include "atari.h"
#include "a8lib.h"
//#link "a8lib.c"
//#link "a8lib_dli.c"
//#link "a8lib_pmg.c"
//#link "a8lib_pokey.c"
//#link "pokeymusic.cpp"
/* 24 rows x 40 columns of text screen codes. */
static byte screen[24][40];
/* can't cross a 4K boundary */
#pragma align(screen, 0x1000)
/* Player 0 shape: a small ball. */
static const byte ball[8] = {
0x18, 0x3c, 0x7e, 0xff, 0xff, 0x7e, 0x3c, 0x18
};
// MUSIC DATA -- "The Easy Winners" by Scott Joplin
static const byte music1[] = {
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};
static void fill_screen(void) {
byte y, x;
for (y = 0; y < 24; y++)
for (x = 0; x < 40; x++)
screen[y][x] = (byte)(0x20 + ((x + y) & 0x0f));
}
static void build_display(void) {
byte i, d;
a8_dli_clear();
a8_dlist_reset();
a8_dlist_blank(24);
/* First text line carries the LMS pointer and the first DLI band. */
d = a8_dlist_line(DL_CHR40x8x1, screen, 1);
a8_dli_set(d, A8_REG_COLBK, A8_COLOR(HUE_GREY, 0));
a8_dli_set(d, A8_REG_COLPF2, A8_COLOR(HUE_GREY, 6));
for (i = 1; i < 23; i++) {
byte on = (byte)(i == 6 || i == 12 || i == 18);
d = a8_dlist_line(DL_CHR40x8x1, 0, on);
if (on) {
byte band = (byte)(i / 6);
a8_dli_set(d, A8_REG_COLBK, (byte)(A8_COLOR(band * 4, 1)));
a8_dli_set(d, A8_REG_COLPF2, (byte)(A8_COLOR(band * 4 + 2, 6)));
}
}
a8_dlist_line(DL_CHR20x16x2, 0, 1); // make last line bigger
a8_dlist_finish();
}
int main(void) {
static byte x = 128;
static byte dx = 2;
byte i;
fill_screen();
build_display();
/* Character set page (E000 on the 800, F800 on the 5200). */
#if defined(__ATARI5200__)
ANTIC.chbase = 0xf8;
#else
ANTIC.chbase = 0xe0;
#endif
a8_dlist_install();
a8_dli_install();
a8_pmg_init(A8_PMG_DOUBLE);
// set up all 4 sprites
for (i=0; i<4; i++) {
a8_pmg_set_x(i, x);
a8_pmg_set_color(i, A8_COLOR(HUE_GREY, 0x0f-i));
a8_pmg_set_size(i, A8_PMG_NORMAL);
a8_pmg_set_shape(i, ball, sizeof(ball), i*16 + 8);
}
// combine missiles into 5th sprite
// colors are taken from the 4 sprites
a8_pmg_5th_enable(1);
a8_pmg_5th_x(100);
a8_pmg_5th_shape(ball, sizeof(ball), 0x48);
// set interrupt and start music
a8_pokey_init();
a8_pokey_music_init();
music_start(music1);
while (1) {
a8_waitvsync();
x += dx;
if (x < 48) { x = 48; dx = 2; }
if (x > 208) { x = 208; dx = (byte)-2; }
// set sprite sizes if joystick moved or trigger pushed
if (a8_get_trigger(0)) {
a8_pmg_5th_size(A8_PMG_QUADW);
} else {
a8_pmg_5th_size(A8_PMG_NORMAL);
}
if (a8_get_stick(0)) {
a8_pmg_set_size(a8_get_stick(0) & 3, A8_PMG_QUADW);
} else {
a8_pmg_set_size(0, A8_PMG_NORMAL);
a8_pmg_set_size(1, A8_PMG_NORMAL);
a8_pmg_set_size(2, A8_PMG_NORMAL);
a8_pmg_set_size(3, A8_PMG_NORMAL);
}
// set X positions
a8_pmg_set_x(0, x);
a8_pmg_set_x(1, x);
a8_pmg_set_x(2, x);
a8_pmg_set_x(3, x);
a8_pmg_5th_x(255-x);
}
}