uxn/src/emulator.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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/*
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.
*/
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#include "uxn.h"
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int initapu(Uxn *u, Uint8 id);
void stepapu(Uxn *u);
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#define HOR 48
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#define VER 32
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#define PAD 2
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#define RES (HOR * VER * 16)
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typedef struct {
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Uint8 reqdraw, bg[RES], fg[RES];
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Uint16 x1, y1, x2, y2;
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} Screen;
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int WIDTH = 8 * HOR + 8 * PAD * 2;
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int HEIGHT = 8 * VER + 8 * PAD * 2;
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int FPS = 30, GUIDES = 0, ZOOM = 2;
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Uint32 *pixels, theme[4];
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Uint8 font[][8] = {
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{0x00, 0x3c, 0x46, 0x4a, 0x52, 0x62, 0x3c, 0x00},
{0x00, 0x18, 0x28, 0x08, 0x08, 0x08, 0x3e, 0x00},
{0x00, 0x3c, 0x42, 0x02, 0x3c, 0x40, 0x7e, 0x00},
{0x00, 0x3c, 0x42, 0x1c, 0x02, 0x42, 0x3c, 0x00},
{0x00, 0x08, 0x18, 0x28, 0x48, 0x7e, 0x08, 0x00},
{0x00, 0x7e, 0x40, 0x7c, 0x02, 0x42, 0x3c, 0x00},
{0x00, 0x3c, 0x40, 0x7c, 0x42, 0x42, 0x3c, 0x00},
{0x00, 0x7e, 0x02, 0x04, 0x08, 0x10, 0x10, 0x00},
{0x00, 0x3c, 0x42, 0x3c, 0x42, 0x42, 0x3c, 0x00},
{0x00, 0x3c, 0x42, 0x42, 0x3e, 0x02, 0x3c, 0x00},
{0x00, 0x3c, 0x42, 0x42, 0x7e, 0x42, 0x42, 0x00},
{0x00, 0x7c, 0x42, 0x7c, 0x42, 0x42, 0x7c, 0x00},
{0x00, 0x3c, 0x42, 0x40, 0x40, 0x42, 0x3c, 0x00},
{0x00, 0x78, 0x44, 0x42, 0x42, 0x44, 0x78, 0x00},
{0x00, 0x7e, 0x40, 0x7c, 0x40, 0x40, 0x7e, 0x00},
{0x00, 0x7e, 0x40, 0x40, 0x7c, 0x40, 0x40, 0x00}};
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static SDL_Window *gWindow;
static SDL_Renderer *gRenderer;
static SDL_Texture *gTexture;
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SDL_AudioDeviceID audio_id;
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static Screen screen;
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static Device *devsystem, *devscreen, *devmouse, *devkey, *devctrl;
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#pragma mark - Helpers
int
clamp(int val, int min, int max)
{
return (val >= min) ? (val <= max) ? val : max : min;
}
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void
setflag(Uint8 *a, char flag, int b)
{
if(b)
*a |= flag;
else
*a &= (~flag);
}
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int
getflag(Uint8 *a, char flag)
{
return *a & flag;
}
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#pragma mark - Paint
void
paintpixel(Uint8 *dst, Uint16 x, Uint16 y, Uint8 color)
{
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Uint16 row = (y % 8) + ((x / 8 + y / 8 * HOR) * 16), col = 7 - (x % 8);
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if(x >= HOR * 8 || y >= VER * 8 || row > RES - 8)
return;
if(color == 0 || color == 2)
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dst[row] &= ~(1UL << col);
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else
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dst[row] |= 1UL << col;
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if(color == 0 || color == 1)
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dst[row + 8] &= ~(1UL << col);
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else
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dst[row + 8] |= 1UL << col;
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}
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#pragma mark - Helpers
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void
clear(Uint32 *dst)
{
int v, h;
for(v = 0; v < HEIGHT; v++)
for(h = 0; h < WIDTH; h++)
dst[v * WIDTH + h] = theme[0];
}
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void
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drawpixel(Uint32 *dst, Uint16 x, Uint16 y, Uint8 color)
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{
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if(x >= screen.x1 && x <= screen.x2 && y >= screen.x1 && y <= screen.y2)
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dst[y * WIDTH + x] = theme[color];
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}
void
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drawchr(Uint32 *dst, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 alpha)
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{
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Uint8 v, h;
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for(v = 0; v < 8; v++)
for(h = 0; h < 8; h++) {
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Uint8 ch1 = ((sprite[v] >> h) & 0x1);
Uint8 ch2 = (((sprite[v + 8] >> h) & 0x1) << 1);
if(!alpha || (alpha && ch1 + ch2 != 0))
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drawpixel(dst, x + 7 - h, y + v, ch1 + ch2);
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}
}
void
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drawicn(Uint32 *dst, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 fg, Uint8 bg)
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{
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Uint8 v, h;
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for(v = 0; v < 8; v++)
for(h = 0; h < 8; h++) {
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Uint8 ch1 = (sprite[v] >> (7 - h)) & 0x1;
drawpixel(dst, x + h, y + v, ch1 ? fg : bg);
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}
}
#pragma mark - Core
int
error(char *msg, const char *err)
{
printf("Error %s: %s\n", msg, err);
return 0;
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}
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void
loadtheme(Uint8 *addr)
{
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int i;
for(i = 0; i < 4; ++i) {
Uint8
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r = (*(addr + i / 2) >> (!(i % 2) << 2)) & 0x0f,
g = (*(addr + 2 + i / 2) >> (!(i % 2) << 2)) & 0x0f,
b = (*(addr + 4 + i / 2) >> (!(i % 2) << 2)) & 0x0f;
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theme[i] = (r << 20) + (r << 16) + (g << 12) + (g << 8) + (b << 4) + b;
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}
screen.reqdraw = 1;
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}
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void
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drawdebugger(Uint32 *dst, Uxn *u)
{
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Uint8 i, x, y, b;
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for(i = 0; i < 0x10; ++i) { /* memory */
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x = ((i % 8) * 3 + 3) * 8, y = screen.x1 + 8 + i / 8 * 8, b = u->wst.dat[i];
drawicn(dst, x, y, font[(b >> 4) & 0xf], 1 + (u->wst.ptr == i), 0);
drawicn(dst, x + 8, y, font[b & 0xf], 1 + (u->wst.ptr == i), 0);
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}
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for(x = 0; x < 32; ++x) {
drawpixel(dst, x, HEIGHT / 2, 2);
drawpixel(dst, WIDTH - x, HEIGHT / 2, 2);
drawpixel(dst, WIDTH / 2, HEIGHT - x, 2);
drawpixel(dst, WIDTH / 2, x, 2);
drawpixel(dst, WIDTH / 2 - 16 + x, HEIGHT / 2, 2);
drawpixel(dst, WIDTH / 2, HEIGHT / 2 - 16 + x, 2);
}
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}
void
redraw(Uint32 *dst, Uxn *u)
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{
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Uint16 x, y;
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for(y = 0; y < VER; ++y)
for(x = 0; x < HOR; ++x) {
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Uint16 key = (y * HOR + x) * 16;
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drawchr(dst, (x + PAD) * 8, (y + PAD) * 8, &screen.bg[key], 0);
drawchr(dst, (x + PAD) * 8, (y + PAD) * 8, &screen.fg[key], 1);
}
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if(GUIDES)
drawdebugger(dst, u);
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SDL_UpdateTexture(gTexture, NULL, dst, WIDTH * sizeof(Uint32));
SDL_RenderClear(gRenderer);
SDL_RenderCopy(gRenderer, gTexture, NULL, NULL);
SDL_RenderPresent(gRenderer);
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screen.reqdraw = 0;
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}
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void
toggledebug(Uxn *u)
{
GUIDES = !GUIDES;
redraw(pixels, u);
}
void
togglezoom(Uxn *u)
{
ZOOM = ZOOM == 3 ? 1 : ZOOM + 1;
SDL_SetWindowSize(gWindow, WIDTH * ZOOM, HEIGHT * ZOOM);
redraw(pixels, u);
}
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void
quit(void)
{
free(pixels);
SDL_DestroyTexture(gTexture);
gTexture = NULL;
SDL_DestroyRenderer(gRenderer);
gRenderer = NULL;
SDL_DestroyWindow(gWindow);
gWindow = NULL;
SDL_Quit();
exit(0);
}
int
init(void)
{
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, WIDTH * ZOOM, HEIGHT * ZOOM, SDL_WINDOW_SHOWN);
if(gWindow == NULL)
return error("Window", SDL_GetError());
gRenderer = SDL_CreateRenderer(gWindow, -1, 0);
if(gRenderer == NULL)
return error("Renderer", SDL_GetError());
gTexture = SDL_CreateTexture(gRenderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, WIDTH, HEIGHT);
if(gTexture == NULL)
return error("Texture", SDL_GetError());
if(!(pixels = (Uint32 *)malloc(WIDTH * HEIGHT * sizeof(Uint32))))
return error("Pixels", "Failed to allocate memory");
clear(pixels);
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SDL_StartTextInput();
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SDL_ShowCursor(SDL_DISABLE);
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screen.x1 = PAD * 8;
screen.x2 = WIDTH - PAD * 8 - 1;
screen.y1 = PAD * 8;
screen.y2 = HEIGHT - PAD * 8 - 1;
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return 1;
}
void
domouse(Uxn *u, SDL_Event *event)
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{
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Uint8 flag = 0x00;
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Uint16 addr = devmouse->addr + 2;
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Uint16 x = clamp(event->motion.x / ZOOM - PAD * 8, 0, HOR * 8 - 1);
Uint16 y = clamp(event->motion.y / ZOOM - PAD * 8, 0, VER * 8 - 1);
u->ram.dat[addr + 0] = (x >> 8) & 0xff;
u->ram.dat[addr + 1] = x & 0xff;
u->ram.dat[addr + 2] = (y >> 8) & 0xff;
u->ram.dat[addr + 3] = y & 0xff;
u->ram.dat[addr + 5] = 0x00;
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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_MOUSEBUTTONUP:
setflag(&u->ram.dat[addr + 4], flag, 0);
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break;
case SDL_MOUSEBUTTONDOWN:
setflag(&u->ram.dat[addr + 4], flag, 1);
if(flag == 0x10 && getflag(&u->ram.dat[addr + 4], 0x01))
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u->ram.dat[addr + 5] = 0x01;
if(flag == 0x01 && getflag(&u->ram.dat[addr + 4], 0x10))
u->ram.dat[addr + 5] = 0x10;
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break;
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}
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}
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void
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dotext(Uxn *u, SDL_Event *event)
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{
int i;
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Uint16 addr = devkey->addr + 2;
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if(SDL_GetModState() & KMOD_LCTRL || SDL_GetModState() & KMOD_RCTRL)
return;
for(i = 0; i < SDL_TEXTINPUTEVENT_TEXT_SIZE; ++i) {
char c = event->text.text[i];
if(c < ' ' || c > '~')
break;
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u->ram.dat[addr] = c;
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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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Uint16 addr = devctrl->addr + 2;
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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_BACKSPACE:
flag = 0x04;
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if(z) u->ram.dat[devkey->addr + 2] = 0x08;
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break;
case SDLK_RETURN:
flag = 0x08;
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if(z) u->ram.dat[devkey->addr + 2] = 0x0d;
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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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setflag(&u->ram.dat[addr], flag, z);
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}
#pragma mark - Devices
Uint8
console_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
{
Uint8 *m = u->ram.dat;
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switch(b0) {
case 0x08: printf("%c", b1); break;
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case 0x09: printf("0x%02x\n", b1); break;
case 0x0b: printf("0x%04x\n", (m[ptr + 0x0a] << 8) + b1); break;
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case 0x0d: printf("%s\n", &m[(m[ptr + 0x0c] << 8) + b1]); break;
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}
fflush(stdout);
(void)m;
(void)ptr;
(void)b0;
return b1;
}
Uint8
screen_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
{
Uint8 *m = u->ram.dat;
ptr += 8;
if(b0 == 0x0c) {
Uint16 x = (m[ptr] << 8) + m[ptr + 1];
Uint16 y = (m[ptr + 2] << 8) + m[ptr + 3];
paintpixel(b1 >> 4 & 0xf ? screen.fg : screen.bg, x, y, b1 & 0xf);
screen.reqdraw = 1;
}
return b1;
}
Uint8
sprite_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
{
Uint8 *m = u->ram.dat;
ptr += 8;
if(b0 == 0x0e) {
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Uint16 v, h;
Uint16 x = (m[ptr] << 8) + m[ptr + 1];
Uint16 y = (m[ptr + 2] << 8) + m[ptr + 3];
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Uint8 blend = b1 & 0xf;
Uint8 *layer = ((b1 >> 4) & 0xf) % 2 ? screen.fg : screen.bg;
Uint8 *sprite = &m[(m[ptr + 4] << 8) + m[ptr + 5]];
for(v = 0; v < 8; v++)
for(h = 0; h < 8; h++) {
Uint8 ch1 = ((sprite[v] >> (7 - h)) & 0x1);
if(ch1 == 0 && (blend == 0x05 || blend == 0x0a || blend == 0x0f))
continue;
paintpixel(layer, x + h, y + v, ch1 ? blend % 4 : blend / 4);
}
screen.reqdraw = 1;
}
return b1;
}
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Uint8
file_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
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{
Uint8 *m = u->ram.dat;
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char *name = (char *)&m[(m[ptr + 8] << 8) + m[ptr + 8 + 1]];
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Uint16 length = (m[ptr + 8 + 2] << 8) + m[ptr + 8 + 3];
Uint16 offset = (m[ptr + 0] << 8) + m[ptr + 1];
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if(b0 == 0x0d) {
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Uint16 addr = (m[ptr + 8 + 4] << 8) + b1;
FILE *f = fopen(name, "r");
if(f && fseek(f, offset, SEEK_SET) != -1 && fread(&m[addr], length, 1, f)) {
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fclose(f);
printf("Loaded %d bytes, at %04x from %s\n", length, addr, name);
}
} else if(b0 == 0x0f) {
Uint16 addr = (m[ptr + 8 + 6] << 8) + b1;
FILE *f = fopen(name, (m[ptr + 2] & 0x1) ? "a" : "w");
if(f && fseek(f, offset, SEEK_SET) != -1 && fwrite(&m[addr], length, 1, f)) {
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fclose(f);
printf("Saved %d bytes, at %04x from %s\n", length, addr, name);
}
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}
return b1;
}
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Uint8
midi_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
{
(void)u;
printf("%04x - %02x,%02x\n", ptr, b0, b1);
return b1;
}
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Uint8
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datetime_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
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{
Uint8 *m = u->ram.dat;
time_t seconds = time(NULL);
struct tm *t = localtime(&seconds);
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t->tm_year += 1900;
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m[ptr + 0] = (t->tm_year & 0xff00) >> 8;
m[ptr + 1] = t->tm_year & 0xff;
m[ptr + 2] = t->tm_mon;
m[ptr + 3] = t->tm_mday;
m[ptr + 4] = t->tm_hour;
m[ptr + 5] = t->tm_min;
m[ptr + 6] = t->tm_sec;
m[ptr + 7] = t->tm_wday;
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m[ptr + 8] = (t->tm_yday & 0xff00) >> 8;
m[ptr + 9] = t->tm_yday & 0xff;
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m[ptr + 10] = t->tm_isdst;
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(void)b0;
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return b1;
}
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Uint8
system_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
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{
Uint8 *m = u->ram.dat;
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m[PAGE_DEVICE + b0] = b1;
loadtheme(&m[PAGE_DEVICE + 0x0008]);
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(void)ptr;
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return b1;
}
Uint8
ppnil(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
{
(void)u;
(void)ptr;
(void)b0;
return b1;
}
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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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inituxn(u, 0x0200);
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redraw(pixels, u);
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while(1) {
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SDL_Event event;
double elapsed, start = SDL_GetPerformanceCounter();
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SDL_LockAudioDevice(audio_id);
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while(SDL_PollEvent(&event) != 0) {
switch(event.type) {
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case SDL_QUIT:
SDL_UnlockAudioDevice(audio_id);
quit();
break;
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case SDL_MOUSEBUTTONUP:
case SDL_MOUSEBUTTONDOWN:
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case SDL_MOUSEMOTION:
domouse(u, &event);
evaluxn(u, devmouse->vector);
break;
case SDL_KEYDOWN:
case SDL_KEYUP:
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doctrl(u, &event, event.type == SDL_KEYDOWN);
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evaluxn(u, devctrl->vector);
break;
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case SDL_TEXTINPUT:
dotext(u, &event);
evaluxn(u, devkey->vector);
break;
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case SDL_WINDOWEVENT:
if(event.window.event == SDL_WINDOWEVENT_EXPOSED)
redraw(pixels, u);
break;
}
}
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evaluxn(u, devscreen->vector);
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SDL_UnlockAudioDevice(audio_id);
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if(screen.reqdraw)
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redraw(pixels, u);
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elapsed = (SDL_GetPerformanceCounter() - start) / (double)SDL_GetPerformanceFrequency() * 1000.0f;
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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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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");
if(!init())
return error("Init", "Failed");
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devsystem = portuxn(&u, 0x00, "system", system_poke);
portuxn(&u, 0x01, "console", console_poke);
devscreen = portuxn(&u, 0x02, "screen", screen_poke);
portuxn(&u, 0x03, "sprite", sprite_poke);
devctrl = portuxn(&u, 0x04, "controller", ppnil);
devkey = portuxn(&u, 0x05, "key", ppnil);
devmouse = portuxn(&u, 0x06, "mouse", ppnil);
portuxn(&u, 0x07, "file", file_poke);
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if(!initapu(&u, 0x08))
return 1;
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portuxn(&u, 0x09, "midi", ppnil);
portuxn(&u, 0x0a, "datetime", datetime_poke);
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portuxn(&u, 0x0b, "---", ppnil);
portuxn(&u, 0x0c, "---", ppnil);
portuxn(&u, 0x0d, "---", ppnil);
portuxn(&u, 0x0e, "---", ppnil);
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portuxn(&u, 0x0f, "---", ppnil);
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/* Write screen size to dev/screen */
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u.ram.dat[devscreen->addr + 2] = (HOR * 8 >> 8) & 0xff;
u.ram.dat[devscreen->addr + 3] = HOR * 8 & 0xff;
u.ram.dat[devscreen->addr + 4] = (VER * 8 >> 8) & 0xff;
u.ram.dat[devscreen->addr + 5] = VER * 8 & 0xff;
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start(&u);
quit();
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return 0;
}