uxn/src/uxnemu.c

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C
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#include <SDL2/SDL.h>
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#include <stdio.h>
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#include <time.h>
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#include "uxn.h"
#include "devices/ppu.h"
#include "devices/apu.h"
#include "devices/mpu.h"
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/*
Copyright (c) 2021 Devine Lu Linvega
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/
static SDL_AudioDeviceID audio_id;
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static SDL_Window *gWindow;
static SDL_Renderer *gRenderer;
static SDL_Texture *fgTexture, *bgTexture;
static SDL_Rect gRect;
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static Ppu ppu;
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static Apu apu[POLYPHONY];
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static Mpu mpu;
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static Device *devscreen, *devmouse, *devctrl, *devmidi, *devaudio0;
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#define PAD 16
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Uint8 zoom = 0, debug = 0, reqdraw = 0, bench = 0;
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int
clamp(int val, int min, int max)
{
return (val >= min) ? (val <= max) ? val : max : min;
}
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int
error(char *msg, const char *err)
{
printf("Error %s: %s\n", msg, err);
return 0;
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}
static void
audio_callback(void *u, Uint8 *stream, int len)
{
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int i;
Sint16 *samples = (Sint16 *)stream;
SDL_memset(stream, 0, len);
for(i = 0; i < POLYPHONY; ++i)
apu_render(&apu[i], samples, samples + len / 2);
(void)u;
}
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void
redraw(Uxn *u)
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{
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if(debug)
inspect(&ppu, u->wst.dat, u->wst.ptr);
SDL_UpdateTexture(bgTexture, &gRect, ppu.bg.pixels, ppu.width * sizeof(Uint32));
SDL_UpdateTexture(fgTexture, &gRect, ppu.fg.pixels, ppu.width * sizeof(Uint32));
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SDL_RenderClear(gRenderer);
SDL_RenderCopy(gRenderer, bgTexture, NULL, NULL);
SDL_RenderCopy(gRenderer, fgTexture, NULL, NULL);
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SDL_RenderPresent(gRenderer);
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reqdraw = 0;
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}
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void
toggledebug(Uxn *u)
{
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debug = !debug;
redraw(u);
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}
void
togglezoom(Uxn *u)
{
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zoom = zoom == 3 ? 1 : zoom + 1;
SDL_SetWindowSize(gWindow, (ppu.width + PAD * 2) * zoom, (ppu.height + PAD * 2) * zoom);
redraw(u);
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}
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void
quit(void)
{
free(ppu.fg.pixels);
free(ppu.bg.pixels);
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SDL_UnlockAudioDevice(audio_id);
SDL_DestroyTexture(bgTexture);
bgTexture = NULL;
SDL_DestroyTexture(fgTexture);
fgTexture = NULL;
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SDL_DestroyRenderer(gRenderer);
gRenderer = NULL;
SDL_DestroyWindow(gWindow);
gWindow = NULL;
SDL_Quit();
exit(0);
}
int
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init(void)
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{
SDL_AudioSpec as;
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if(!initppu(&ppu, 48, 32))
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return error("PPU", "Init failure");
gRect.x = PAD;
gRect.y = PAD;
gRect.w = ppu.width;
gRect.h = ppu.height;
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if(!initmpu(&mpu, 1))
return error("MPU", "Init failure");
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0)
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return error("Init", SDL_GetError());
gWindow = SDL_CreateWindow("Uxn", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, (ppu.width + PAD * 2) * zoom, (ppu.height + PAD * 2) * zoom, SDL_WINDOW_SHOWN);
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if(gWindow == NULL)
return error("Window", SDL_GetError());
gRenderer = SDL_CreateRenderer(gWindow, -1, 0);
if(gRenderer == NULL)
return error("Renderer", SDL_GetError());
SDL_RenderSetLogicalSize(gRenderer, ppu.width + PAD * 2, ppu.height + PAD * 2);
bgTexture = SDL_CreateTexture(gRenderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, ppu.width + PAD * 2, ppu.height + PAD * 2);
if(bgTexture == NULL || SDL_SetTextureBlendMode(bgTexture, SDL_BLENDMODE_NONE))
return error("Texture", SDL_GetError());
fgTexture = SDL_CreateTexture(gRenderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, ppu.width + PAD * 2, ppu.height + PAD * 2);
if(fgTexture == NULL || SDL_SetTextureBlendMode(fgTexture, SDL_BLENDMODE_BLEND))
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return error("Texture", SDL_GetError());
SDL_UpdateTexture(bgTexture, NULL, ppu.bg.pixels, 4);
SDL_UpdateTexture(fgTexture, NULL, ppu.fg.pixels, 4);
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SDL_StartTextInput();
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SDL_ShowCursor(SDL_DISABLE);
SDL_zero(as);
as.freq = SAMPLE_FREQUENCY;
as.format = AUDIO_S16;
as.channels = 2;
as.callback = audio_callback;
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as.samples = 512;
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as.userdata = NULL;
audio_id = SDL_OpenAudioDevice(NULL, 0, &as, NULL, 0);
if(!audio_id)
return error("Audio", SDL_GetError());
SDL_PauseAudioDevice(audio_id, 0);
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return 1;
}
void
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domouse(SDL_Event *event)
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{
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Uint8 flag = 0x00;
Uint16 x = clamp(event->motion.x - PAD, 0, ppu.hor * 8 - 1);
Uint16 y = clamp(event->motion.y - PAD, 0, ppu.ver * 8 - 1);
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mempoke16(devmouse->dat, 0x2, x);
mempoke16(devmouse->dat, 0x4, y);
switch(event->button.button) {
case SDL_BUTTON_LEFT: flag = 0x01; break;
case SDL_BUTTON_RIGHT: flag = 0x10; break;
}
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switch(event->type) {
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case SDL_MOUSEBUTTONDOWN:
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devmouse->dat[6] |= flag;
if(flag == 0x10 && (devmouse->dat[6] & 0x01))
if(flag == 0x01 && (devmouse->dat[6] & 0x10))
break;
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case SDL_MOUSEBUTTONUP:
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devmouse->dat[6] &= (~flag);
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break;
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}
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}
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void
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doctrl(Uxn *u, SDL_Event *event, int z)
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{
Uint8 flag = 0x00;
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if(z && event->key.keysym.sym == SDLK_h) {
if(SDL_GetModState() & KMOD_LCTRL)
toggledebug(u);
if(SDL_GetModState() & KMOD_LALT)
togglezoom(u);
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}
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switch(event->key.keysym.sym) {
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case SDLK_LCTRL: flag = 0x01; break;
case SDLK_LALT: flag = 0x02; break;
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case SDLK_LSHIFT: flag = 0x04; break;
case SDLK_ESCAPE: flag = 0x08; break;
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case SDLK_UP: flag = 0x10; break;
case SDLK_DOWN: flag = 0x20; break;
case SDLK_LEFT: flag = 0x40; break;
case SDLK_RIGHT: flag = 0x80; break;
}
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if(flag && z)
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devctrl->dat[2] |= flag;
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else if(flag)
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devctrl->dat[2] &= (~flag);
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if(z && event->key.keysym.sym < 20)
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devctrl->dat[3] = event->key.keysym.sym;
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}
#pragma mark - Devices
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void
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system_talk(Device *d, Uint8 b0, Uint8 w)
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{
if(!w) {
d->dat[0x2] = d->u->wst.ptr;
d->dat[0x3] = d->u->rst.ptr;
} else {
putcolors(&ppu, &d->dat[0x8]);
reqdraw = 1;
}
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(void)b0;
}
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void
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console_talk(Device *d, Uint8 b0, Uint8 w)
{
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if(!w) return;
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switch(b0) {
case 0x8: printf("%c", d->dat[0x8]); break;
case 0x9: printf("0x%02x", d->dat[0x9]); break;
case 0xb: printf("0x%04x", mempeek16(d->dat, 0xa)); break;
case 0xd: printf("%s", &d->mem[mempeek16(d->dat, 0xc)]); break;
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}
fflush(stdout);
}
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void
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screen_talk(Device *d, Uint8 b0, Uint8 w)
{
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if(w && b0 == 0xe) {
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Uint16 x = mempeek16(d->dat, 0x8);
Uint16 y = mempeek16(d->dat, 0xa);
Uint8 *addr = &d->mem[mempeek16(d->dat, 0xc)];
Layer *layer = d->dat[0xe] >> 4 & 0x1 ? &ppu.fg : &ppu.bg;
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Uint8 mode = d->dat[0xe] >> 5;
if(!mode)
putpixel(&ppu, layer, x, y, d->dat[0xe] & 0x3);
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else if(mode-- & 0x1)
puticn(&ppu, layer, x, y, addr, d->dat[0xe] & 0xf, mode & 0x2, mode & 0x4);
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else
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putchr(&ppu, layer, x, y, addr, d->dat[0xe] & 0xf, mode & 0x2, mode & 0x4);
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reqdraw = 1;
}
}
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void
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file_talk(Device *d, Uint8 b0, Uint8 w)
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{
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Uint8 read = b0 == 0xd;
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if(w && (read || b0 == 0xf)) {
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char *name = (char *)&d->mem[mempeek16(d->dat, 0x8)];
Uint16 result = 0, length = mempeek16(d->dat, 0xa);
Uint16 offset = mempeek16(d->dat, 0x4);
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Uint16 addr = mempeek16(d->dat, b0 - 1);
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FILE *f = fopen(name, read ? "r" : (offset ? "a" : "w"));
if(f) {
printf("%s %04x %s %s: ", read ? "Loading" : "Saving", addr, read ? "from" : "to", name);
if(fseek(f, offset, SEEK_SET) != -1)
result = read ? fread(&d->mem[addr], 1, length, f) : fwrite(&d->mem[addr], 1, length, f);
printf("%04x bytes\n", result);
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fclose(f);
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}
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mempoke16(d->dat, 0x2, result);
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}
}
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static void
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audio_talk(Device *d, Uint8 b0, Uint8 w)
{
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Apu *c = &apu[d - devaudio0];
if(!w) {
if(b0 == 0x2)
mempoke16(d->dat, 0x2, c->i);
else if(b0 == 0x4)
d->dat[0x4] = apu_get_vu(c);
} else if(b0 == 0xf) {
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SDL_LockAudioDevice(audio_id);
c->len = mempeek16(d->dat, 0xa);
c->addr = &d->mem[mempeek16(d->dat, 0xc)];
c->volume[0] = d->dat[0xe] >> 4;
c->volume[1] = d->dat[0xe] & 0xf;
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c->repeat = !(d->dat[0xf] & 0x80);
apu_start(c, mempeek16(d->dat, 0x8), d->dat[0xf] & 0x7f);
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SDL_UnlockAudioDevice(audio_id);
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}
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}
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void
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datetime_talk(Device *d, Uint8 b0, Uint8 w)
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{
time_t seconds = time(NULL);
struct tm *t = localtime(&seconds);
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t->tm_year += 1900;
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mempoke16(d->dat, 0x0, t->tm_year);
d->dat[0x2] = t->tm_mon;
d->dat[0x3] = t->tm_mday;
d->dat[0x4] = t->tm_hour;
d->dat[0x5] = t->tm_min;
d->dat[0x6] = t->tm_sec;
d->dat[0x7] = t->tm_wday;
mempoke16(d->dat, 0x08, t->tm_yday);
d->dat[0xa] = t->tm_isdst;
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(void)b0;
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(void)w;
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}
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void
midi_talk(Device *d, Uint8 b0, Uint8 w)
{
(void)d;
(void)b0;
(void)w;
}
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void
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nil_talk(Device *d, Uint8 b0, Uint8 w)
{
(void)d;
(void)b0;
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(void)w;
}
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#pragma mark - Generics
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int
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start(Uxn *u)
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{
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evaluxn(u, 0x0100);
redraw(u);
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while(1) {
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int i;
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SDL_Event event;
double elapsed, start = 0;
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if(!bench)
start = SDL_GetPerformanceCounter();
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while(SDL_PollEvent(&event) != 0) {
switch(event.type) {
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case SDL_QUIT:
quit();
break;
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case SDL_TEXTINPUT:
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case SDL_KEYDOWN:
case SDL_KEYUP:
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if(event.text.text[0] >= ' ' && event.text.text[0] <= '~')
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devctrl->dat[3] = event.text.text[0];
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doctrl(u, &event, event.type == SDL_KEYDOWN);
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evaluxn(u, mempeek16(devctrl->dat, 0));
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devctrl->dat[3] = 0;
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break;
case SDL_MOUSEWHEEL:
devmouse->dat[7] = event.wheel.y;
evaluxn(u, mempeek16(devmouse->dat, 0));
break;
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case SDL_MOUSEBUTTONUP:
case SDL_MOUSEBUTTONDOWN:
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case SDL_MOUSEMOTION:
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domouse(&event);
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evaluxn(u, mempeek16(devmouse->dat, 0));
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break;
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case SDL_WINDOWEVENT:
if(event.window.event == SDL_WINDOWEVENT_EXPOSED)
redraw(u);
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break;
}
}
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listenmpu(&mpu);
for(i = 0; i < mpu.queue; ++i) {
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devmidi->dat[2] = mpu.events[i].message;
devmidi->dat[3] = mpu.events[i].message >> 8;
devmidi->dat[4] = mpu.events[i].message >> 16;
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evaluxn(u, mempeek16(devmidi->dat, 0));
}
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evaluxn(u, mempeek16(devscreen->dat, 0));
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if(reqdraw)
redraw(u);
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if(!bench) {
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elapsed = (SDL_GetPerformanceCounter() - start) / (double)SDL_GetPerformanceFrequency() * 1000.0f;
SDL_Delay(clamp(16.666f - elapsed, 0, 1000));
}
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}
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return 1;
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}
int
main(int argc, char **argv)
{
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Uxn u;
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zoom = 2;
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if(argc < 2)
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return error("Input", "Missing");
if(!bootuxn(&u))
return error("Boot", "Failed");
if(!loaduxn(&u, argv[1]))
return error("Load", "Failed");
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if(!init())
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return error("Init", "Failed");
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portuxn(&u, 0x0, "system", system_talk);
portuxn(&u, 0x1, "console", console_talk);
devscreen = portuxn(&u, 0x2, "screen", screen_talk);
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devaudio0 = portuxn(&u, 0x3, "audio0", audio_talk);
portuxn(&u, 0x4, "audio1", audio_talk);
portuxn(&u, 0x5, "audio2", audio_talk);
portuxn(&u, 0x6, "audio3", audio_talk);
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devmidi = portuxn(&u, 0x7, "midi", midi_talk);
devctrl = portuxn(&u, 0x8, "controller", nil_talk);
devmouse = portuxn(&u, 0x9, "mouse", nil_talk);
portuxn(&u, 0xa, "file", file_talk);
portuxn(&u, 0xb, "datetime", datetime_talk);
portuxn(&u, 0xc, "---", nil_talk);
portuxn(&u, 0xd, "---", nil_talk);
portuxn(&u, 0xe, "---", nil_talk);
portuxn(&u, 0xf, "---", nil_talk);
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/* Write screen size to dev/screen */
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mempoke16(devscreen->dat, 2, ppu.hor * 8);
mempoke16(devscreen->dat, 4, ppu.ver * 8);
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start(&u);
quit();
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return 0;
}