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#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include "shorthand.h"
#include "ppu.c"
#include "uxn-fast.c"
static Uxn u;
static Device *devscreen;
static Device *devctrl;
static Device *devmouse;
static Device *devaudio;
typedef struct timespec Time;
Time
time_now(){
struct timespec t;
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &t);
return t;
}
size_t
time_elapsed(Time since){
struct timespec now = time_now();
return (now.tv_sec - since.tv_sec) * 1e9 + (now.tv_nsec - since.tv_nsec);
}
void
nil_talk(Device *d, u8 b0, u8 w) {
(void)d;
(void)b0;
(void)w;
}
void
console_talk(Device *d, u8 b0, u8 w) {
(void)d;
(void)b0;
(void)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) {
if (w) {
switch (b0) {
case 0x1: {
d->vector = mempeek16(d->dat, 0x0);
} break;
case 0xe: {
u16 x = mempeek16(d->dat, 0x8);
u16 y = mempeek16(d->dat, 0xa);
u8 *addr = &d->mem[mempeek16(d->dat, 0xc)];
u8 *layer = d->dat[0xe] >> 4 & 0x1 ? pixels_fg : pixels_bg;
u8 mode = d->dat[0xe] >> 5;
u8 color = d->dat[0xf] & 0xf;
if(!mode) {
ppu_pixel(layer, x, y, d->dat[0xe] & 0x3);
} else if(mode-- & 0x1) {
u8 flipx = mode & 0x2;
u8 flipy = mode & 0x4;
ppu_1bpp(layer, x, y, addr, color, flipx, flipy);
} else {
u8 flipx = mode & 0x2;
u8 flipy = mode & 0x4;
ppu_2bpp(layer, x, y, addr, color, flipx, flipy);
}
if(d->dat[0x6] & 0x01) { mempoke16(d->dat, 0x8, x + 1); }
if(d->dat[0x6] & 0x02) { mempoke16(d->dat, 0xa, y + 1); }
} break;
case 0xf: {
u16 x = mempeek16(d->dat, 0x8);
u16 y = mempeek16(d->dat, 0xa);
u8 *addr = &d->mem[mempeek16(d->dat, 0xc)];
u8 *layer = d->dat[0xf] >> 6 & 0x1 ? pixels_fg : pixels_bg;
u8 color = d->dat[0xf] & 0xf;
u8 flipx = (d->dat[0xf] >> 0x4) & 0x1;
u8 flipy = (d->dat[0xf] >> 0x5) & 0x1;
if(d->dat[0xf] >> 0x7 & 0x1) {
ppu_2bpp(layer, x, y, addr, color, flipx, flipy);
if(d->dat[0x6] & 0x04) {
mempoke16(d->dat, 0xc, mempeek16(d->dat, 0xc) + 16);
}
} else {
ppu_1bpp(layer, x, y, addr, color, flipx, flipy);
if(d->dat[0x6] & 0x04) {
mempoke16(d->dat, 0xc, mempeek16(d->dat, 0xc) + 8);
}
}
if(d->dat[0x6] & 0x01) { mempoke16(d->dat, 0x8, x + 8); }
if(d->dat[0x6] & 0x02) { mempoke16(d->dat, 0xa, y + 8); }
} break;
default: break;
}
}
reqdraw = 1;
}
static void
audio_talk(Device *d, u8 b0, u8 w) {
// TODO: Implement...
(void)d;
(void)b0;
(void)w;
}
void
datetime_talk(Device *d, u8 b0, u8 w) {
// TODO: Implement...
(void)d;
(void)b0;
(void)w;
}
void
file_talk(Device *d, u8 b0, u8 w) {
// TODO: Implement...
(void)d;
(void)b0;
(void)w;
}
void
load_rom(char *file_name) {
FILE *file = fopen(file_name, "r");
if (!file) {
fprintf(stderr, "error: couldn't open file: %s\n", file_name);
exit(EXIT_FAILURE);
}
fseek(file, 0, SEEK_END);
size_t rom_size = ftell(file);
fseek(file, 0, SEEK_SET);
char *uxn_rom = malloc(rom_size);
fread(uxn_rom, 1, rom_size, file);
memcpy(u.ram.dat + PAGE_PROGRAM, uxn_rom, rom_size);
fclose(file);
free(uxn_rom);
}
void
init_uxn(char *file_name) {
// Clear UXN memory.
memset(&u, 0, sizeof(Uxn));
// Copy rom to VM.
load_rom(file_name);
// Initialize framebuffer.
ppu_init();
// 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, screen_width);
mempoke16(devscreen->dat, 4, screen_height);
}
int
main(int argc, char *argv[]) {
if (argc <= 1) {
// TODO: If no rom is given, embed the uxn compiler rom.
fprintf(stderr, "error: no rom selected\n");
exit(EXIT_FAILURE);
}
init_uxn(argv[1]);
// Main loop.
uxn_eval(&u, 0x0100);
Time frame_time = time_now();
while (true) {
size_t elapsed = time_elapsed(frame_time);
if (elapsed >= 16666666) {
// Echo input to standard output.
uxn_eval(&u, mempeek16(devscreen->dat, 0));
// Blit ppu.pixels to the framebuffer.
blit_framebuffer();
frame_time = time_now();
}
}
return 0;
}
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