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#include "common.h"
#include "ppu.c"
#include "uxn-fast.c"
#include "rom.c"
static Uxn u;
static Ppu ppu;
static Device *devscreen;
static Device *devctrl;
static Device *devmouse;
static Device *devaudio;
void
nil_talk(Device *d, u8 b0, u8 w) {
(void)d;
(void)b0;
(void)w;
}
void
console_talk(Device *d, u8 b0, u8 w) {
char stmp[2];
if(!w) {
return;
}
switch(b0) {
case 0x8: stmp[0] = d->dat[0x8]; stmp[1] = 0; uart_puts(stmp); break;
// TODO: implement printf for the uart to be able to format
// numbers.
// case 0x9: txt_printf("0x%02x", d->dat[0x9]); break;
// case 0xb: txt_printf("0x%04x", mempeek16(d->dat, 0xa)); break;
// case 0xd: txt_printf("%s", &d->mem[mempeek16(d->dat, 0xc)]); break;
}
}
static void
docolors(Device *d) {
for(size_t i = 0; i < 4; ++i) {
u8 r = ((d->dat[0x8 + i / 2] >> (!(i % 2) << 2)) & 0x0f) * 0x11;
u8 g = ((d->dat[0xa + i / 2] >> (!(i % 2) << 2)) & 0x0f) * 0x11;
u8 b = ((d->dat[0xc + i / 2] >> (!(i % 2) << 2)) & 0x0f) * 0x11;
if (rgb_order) {
palette[i] = (b << 16) | (g << 8) | r;
} else {
palette[i] = (r << 16) | (g << 8) | b;
}
}
for(size_t i = 4; i < 16; ++i) {
palette[i] = palette[i / 4];
}
// Redraw the screen if we change the color palette.
reqdraw = 1;
redraw_screen();
}
void
system_talk(Device *d, u8 b0, u8 w) {
if(!w) { /* read */
switch(b0) {
case 0x2: d->dat[0x2] = d->u->wst.ptr; break;
case 0x3: d->dat[0x3] = d->u->rst.ptr; break;
}
} else { /* write */
switch(b0) {
case 0x2: d->u->wst.ptr = d->dat[0x2]; break;
case 0x3: d->u->rst.ptr = d->dat[0x3]; break;
case 0xf: d->u->ram.ptr = 0x0000; break;
}
if(b0 > 0x7 && b0 < 0xe) {
docolors(d);
}
}
(void)b0;
}
void
screen_talk(Device *d, u8 b0, u8 w) {
// uart_puts("screen_talk\n");
if(w && b0 == 0xe) {
Uint16 x = mempeek16(d->dat, 0x8);
Uint16 y = mempeek16(d->dat, 0xa);
Uint8 layer = d->dat[0xe] >> 4 & 0x1;
ppu_pixel(&ppu, layer, x, y, d->dat[0xe] & 0x3);
reqdraw = 1;
} else if(w && b0 == 0xf) {
Uint16 x = mempeek16(d->dat, 0x8);
Uint16 y = mempeek16(d->dat, 0xa);
Uint8 layer = d->dat[0xf] >> 0x6 & 0x1;
Uint8 *addr = &d->mem[mempeek16(d->dat, 0xc)];
if(d->dat[0xf] >> 0x7 & 0x1)
ppu_2bpp(&ppu, layer, x, y, addr, d->dat[0xf] & 0xf, d->dat[0xf] >> 0x4 & 0x1, d->dat[0xf] >> 0x5 & 0x1);
else
ppu_1bpp(&ppu, layer, x, y, addr, d->dat[0xf] & 0xf, d->dat[0xf] >> 0x4 & 0x1, d->dat[0xf] >> 0x5 & 0x1);
reqdraw = 1;
}
}
static void
audio_talk(Device *d, u8 b0, u8 w) {
// TODO: Implement...
// uart_puts("audio_talk\n");
(void)d;
(void)b0;
(void)w;
}
void
datetime_talk(Device *d, u8 b0, u8 w) {
// TODO: Implement...
// uart_puts("datetime_talk\n");
(void)d;
(void)b0;
(void)w;
}
void
file_talk(Device *d, u8 b0, u8 w) {
// TODO: Implement...
// uart_puts("file_talk\n");
(void)d;
(void)b0;
(void)w;
}
void
init_uxn() {
uart_puts("Initializing UXN.\n");
// Clear UXN memory.
memzero8(&u, sizeof(Uxn));
ppu_init(&ppu, SCREEN_WIDTH / 8, SCREEN_HEIGHT / 8);
// Copy rom to VM.
memcpy(u.ram.dat + PAGE_PROGRAM, uxn_rom, sizeof(uxn_rom));
// Prepare devices.
uxn_port(&u, 0x0, "system", system_talk);
uxn_port(&u, 0x1, "console", console_talk);
devscreen = uxn_port(&u, 0x2, "screen", screen_talk);
devaudio = uxn_port(&u, 0x3, "audio0", audio_talk);
uxn_port(&u, 0x4, "audio1", audio_talk);
uxn_port(&u, 0x5, "audio2", audio_talk);
uxn_port(&u, 0x6, "audio3", audio_talk);
uxn_port(&u, 0x7, "---", nil_talk);
devctrl = uxn_port(&u, 0x8, "controller", nil_talk);
devmouse = uxn_port(&u, 0x9, "mouse", nil_talk);
uxn_port(&u, 0xa, "file", file_talk);
uxn_port(&u, 0xb, "datetime", datetime_talk);
uxn_port(&u, 0xc, "---", nil_talk);
uxn_port(&u, 0xd, "---", nil_talk);
uxn_port(&u, 0xe, "---", nil_talk);
uxn_port(&u, 0xf, "---", nil_talk);
mempoke16(devscreen->dat, 2, ppu.width);
mempoke16(devscreen->dat, 4, ppu.height);
}
void
clear_bss(void) {
extern u64 __bss_start;
extern u64 __bss_end;
u64 bss_size = &__bss_end - &__bss_start;
memzero64(&__bss_start, bss_size);
}
void
main(void) {
// Initialization.
clear_bss();
uart_init();
init_uxn();
uxn_eval(&u, 0x0100);
u64 current_ticks = timer_get_ticks();
while (true) {
// Echo input to standard output.
uxn_eval(&u, mempeek16(devscreen->dat, 0));
// Blit ppu.pixels to the framebuffer.
blit_framebuffer(&ppu);
// Sync at 60 Hz.
if ((timer_get_ticks() - current_ticks) < 16666) {
wait(16666 - (timer_get_ticks() - current_ticks));
}
current_ticks = timer_get_ticks();
}
}
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