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collapseos/emul/ti/ti84.c

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/* TI-84+
*
* A plain TI-84 with its built-in keyboard as an input and its LCD screen
* as an output.
*
* Uses XCB to render the screen and record keystrokes.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <xcb/xcb.h>
#define XK_MISCELLANY
#include <X11/keysymdef.h>
#include "../emul.h"
#include "t6a04.h"
#include "kbd.h"
#define RAMSTART 0x8000
#define KBD_PORT 0x01
#define INTERRUPT_PORT 0x03
#define LCD_CMD_PORT 0x10
#define LCD_DATA_PORT 0x11
2020-05-10 04:28:55 +10:00
#define MAX_ROMSIZE 0x4000
static xcb_connection_t *conn;
static xcb_screen_t *screen;
/* graphics contexts */
static xcb_gcontext_t fg;
/* win */
static xcb_drawable_t win;
// pixels to draw. We draw them in one shot.
static xcb_rectangle_t rectangles[96*64];
static Machine *m;
static T6A04 lcd;
static bool lcd_changed;
static KBD kbd;
static bool on_was_pressed;
static uint8_t iord_lcd_cmd()
{
return t6a04_cmd_rd(&lcd);
}
static uint8_t iord_lcd_data()
{
return t6a04_data_rd(&lcd);
}
static uint8_t iord_kbd()
{
return kbd_rd(&kbd);
}
static uint8_t iord_interrupt()
{
return on_was_pressed ? 1 : 0;
}
static void iowr_lcd_cmd(uint8_t val)
{
t6a04_cmd_wr(&lcd, val);
}
static void iowr_lcd_data(uint8_t val)
{
lcd_changed = true;
t6a04_data_wr(&lcd, val);
}
static void iowr_kbd(uint8_t val)
{
kbd_wr(&kbd, val);
}
static void iowr_interrupt(uint8_t val)
{
if ((val & 1) == 0) {
on_was_pressed = false;
}
}
static uint8_t keycode_to_tikbd(xcb_keycode_t kc)
{
// First, change keycode into symbol
xcb_get_keyboard_mapping_reply_t* km = xcb_get_keyboard_mapping_reply(
conn, xcb_get_keyboard_mapping(conn, kc, 1), NULL);
xcb_keysym_t* keysyms = (xcb_keysym_t*)(km + 1);
uint8_t res = 0;
for (int i=0; i<km->length; i++) {
switch (keysyms[0]) {
case XK_Shift_L: res = KBD_2ND; break;
case XK_Control_L: res = KBD_ALPHA; break;
case XK_Return: res = 0x10; break;
case XK_Delete: res = 0x67; break;
case ' ': res = 0x40; break;
case '1': res = 0x41; break;
case '2': res = 0x31; break;
case '3': res = 0x21; break;
case '4': res = 0x42; break;
case '5': res = 0x32; break;
case '6': res = 0x22; break;
case '7': res = 0x43; break;
case '8': res = 0x33; break;
case '9': res = 0x23; break;
case '0': res = 0x40; break;
case '-': res = 0x12; break;
case '+': res = 0x11; break;
case 'q': res = 0x23; break;
case 'w': res = 0x12; break;
case 'e': res = 0x45; break;
case 'r': res = 0x13; break;
case 't': res = 0x42; break;
case 'y': res = 0x41; break;
case 'u': res = 0x32; break;
case 'i': res = 0x54; break;
case 'o': res = 0x43; break;
case 'p': res = 0x33; break;
case '(': res = 0x34; break;
case ')': res = 0x24; break;
case 'a': res = 0x56; break;
case 's': res = 0x52; break;
case 'd': res = 0x55; break;
case 'f': res = 0x35; break;
case 'g': res = 0x25; break;
case 'h': res = 0x15; break;
case 'j': res = 0x44; break;
case 'k': res = 0x34; break;
case 'l': res = 0x24; break;
case ':': res = 0x30; break;
case '"': res = 0x11; break;
case 'z': res = 0x31; break;
case 'x': res = 0x51; break;
case 'c': res = 0x36; break;
case 'v': res = 0x22; break;
case 'b': res = 0x46; break;
case 'n': res = 0x53; break;
case 'm': res = 0x14; break;
case ',': res = 0x44; break;
case '.': res = 0x30; break;
case '?': res = 0x20; break;
}
if (res) {
break;
}
}
free(km);
return res;
}
void create_window()
{
uint32_t mask;
uint32_t values[2];
/* Create the window */
win = xcb_generate_id(conn);
mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
values[0] = screen->white_pixel;
values[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS |
XCB_EVENT_MASK_KEY_RELEASE;
xcb_create_window(
conn,
screen->root_depth,
win,
screen->root,
0, 0,
500, 500,
10,
XCB_WINDOW_CLASS_INPUT_OUTPUT,
screen->root_visual,
mask, values);
fg = xcb_generate_id(conn);
mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
values[0] = screen->black_pixel;
values[1] = 0;
xcb_create_gc(conn, fg, screen->root, mask, values);
/* Map the window on the screen */
xcb_map_window(conn, win);
}
bool get_pixel(int x, int y)
{
return t6a04_pixel(&lcd, x, y);
}
void draw_pixels()
{
xcb_get_geometry_reply_t *geom;
geom = xcb_get_geometry_reply(conn, xcb_get_geometry(conn, win), NULL);
xcb_clear_area(
conn, 0, win, 0, 0, geom->width, geom->height);
// Figure out inner size to maximize a 96x64 screen (1.5 aspect ratio)
int psize = geom->height / 64;
if (geom->width / 96 < psize) {
// width is the constraint
psize = geom->width / 96;
}
int innerw = psize * 96;
int innerh = psize * 64;
int innerx = (geom->width - innerw) / 2;
int innery = (geom->height - innerh) / 2;
free(geom);
int drawcnt = 0;
for (int i=0; i<96; i++) {
for (int j=0; j<64; j++) {
if (get_pixel(i, j)) {
int x = innerx + (i*psize);
int y = innery + (j*psize);
rectangles[drawcnt].x = x;
rectangles[drawcnt].y = y;
rectangles[drawcnt].height = psize;
rectangles[drawcnt].width = psize;
drawcnt++;
}
}
}
if (drawcnt) {
xcb_poly_fill_rectangle(
conn, win, fg, drawcnt, rectangles);
}
lcd_changed = false;
xcb_flush(conn);
}
void event_loop()
{
while (1) {
emul_steps(100);
if (lcd_changed) {
draw_pixels();
}
// A low tech way of checking when the window was closed. The proper way
// involving WM_DELETE is too complicated.
xcb_get_geometry_reply_t *geom;
geom = xcb_get_geometry_reply(conn, xcb_get_geometry(conn, win), NULL);
if (geom == NULL) {
return; // window has been closed.
} else {
free(geom);
}
xcb_generic_event_t *e = xcb_poll_for_event(conn);
if (!e) {
continue;
}
switch (e->response_type & ~0x80) {
/* ESC to exit */
case XCB_KEY_RELEASE:
case XCB_KEY_PRESS: {
xcb_key_press_event_t *ev = (xcb_key_press_event_t *)e;
if (ev->detail == 0x09) return;
if (ev->detail == 0x31 && e->response_type == XCB_KEY_PRESS) {
// tilde, mapped to ON
on_was_pressed = true;
Z80INT(&m->cpu, 0);
Z80Execute(&m->cpu); // unhalts the CPU
}
uint8_t key = keycode_to_tikbd(ev->detail);
if (key) {
kbd_setkey(&kbd, key, e->response_type == XCB_KEY_PRESS);
}
break;
}
case XCB_EXPOSE: {
draw_pixels();
break;
}
default: {
break;
}
}
free(e);
}
}
int main(int argc, char *argv[])
{
if (argc != 2) {
fprintf(stderr, "Usage: ./ti84 /path/to/rom\n");
return 1;
}
FILE *fp = fopen(argv[1], "r");
if (fp == NULL) {
fprintf(stderr, "Can't open %s\n", argv[1]);
return 1;
}
m = emul_init();
m->ramstart = RAMSTART;
int i = 0;
int c;
while ((c = fgetc(fp)) != EOF && i < MAX_ROMSIZE) {
m->mem[i++] = c & 0xff;
}
pclose(fp);
if (i == MAX_ROMSIZE) {
fprintf(stderr, "ROM image too large.\n");
return 1;
}
t6a04_init(&lcd);
kbd_init(&kbd);
lcd_changed = false;
on_was_pressed = false;
m->iord[KBD_PORT] = iord_kbd;
m->iord[INTERRUPT_PORT] = iord_interrupt;
m->iord[LCD_CMD_PORT] = iord_lcd_cmd;
m->iord[LCD_DATA_PORT] = iord_lcd_data;
m->iowr[KBD_PORT] = iowr_kbd;
m->iowr[INTERRUPT_PORT] = iowr_interrupt;
m->iowr[LCD_CMD_PORT] = iowr_lcd_cmd;
m->iowr[LCD_DATA_PORT] = iowr_lcd_data;
conn = xcb_connect(NULL, NULL);
screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
create_window();
draw_pixels();
event_loop();
emul_printdebug();
return 0;
}