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https://github.com/hsoft/collapseos.git
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321 lines
8.2 KiB
C
321 lines
8.2 KiB
C
/* TI-84+
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*
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* A plain TI-84 with its built-in keyboard as an input and its LCD screen
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* as an output.
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*
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* Uses XCB to render the screen and record keystrokes.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <xcb/xcb.h>
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#include "../../emul.h"
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#include "t6a04.h"
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#include "kbd.h"
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#define RAMSTART 0x8000
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#define KBD_PORT 0x01
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#define INTERRUPT_PORT 0x03
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#define LCD_CMD_PORT 0x10
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#define LCD_DATA_PORT 0x11
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#define MAX_ROMSIZE 0x2000
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static xcb_connection_t *conn;
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static xcb_screen_t *screen;
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/* graphics contexts */
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static xcb_gcontext_t fg;
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/* win */
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static xcb_drawable_t win;
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// pixels to draw. We draw them in one shot.
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static xcb_rectangle_t rectangles[96*64];
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static Machine *m;
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static T6A04 lcd;
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static bool lcd_changed;
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static KBD kbd;
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static bool on_was_pressed;
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static uint8_t iord_lcd_cmd()
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{
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return t6a04_cmd_rd(&lcd);
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}
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static uint8_t iord_lcd_data()
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{
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return t6a04_data_rd(&lcd);
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}
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static uint8_t iord_kbd()
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{
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return kbd_rd(&kbd);
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}
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static uint8_t iord_interrupt()
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{
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return on_was_pressed ? 1 : 0;
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}
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static void iowr_lcd_cmd(uint8_t val)
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{
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t6a04_cmd_wr(&lcd, val);
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}
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static void iowr_lcd_data(uint8_t val)
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{
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lcd_changed = true;
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t6a04_data_wr(&lcd, val);
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}
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static void iowr_kbd(uint8_t val)
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{
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kbd_wr(&kbd, val);
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}
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static void iowr_interrupt(uint8_t val)
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{
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if ((val & 1) == 0) {
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on_was_pressed = false;
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}
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}
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// TIL: XCB doesn't have a builtin way to translate a keycode to an ASCII char.
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// Using Xlib looks complicated. This will probably not work in many cases (non
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// query keyboards and all...), but for now, let's go with this.
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static uint8_t keycode_to_tikbd(xcb_keycode_t kc)
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{
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switch (kc) {
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case 0x0a: return 0x41; // 1
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case 0x0b: return 0x31; // 2
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case 0x0c: return 0x21; // 3
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case 0x0d: return 0x42; // 4
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case 0x0e: return 0x32; // 5
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case 0x0f: return 0x22; // 6
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case 0x10: return 0x43; // 7
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case 0x11: return 0x33; // 8
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case 0x12: return 0x23; // 9
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case 0x13: return 0x40; // 0
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case 0x14: return 0x12; // -
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case 0x15: return 0x11; // +
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case 0x16: return 0x67; // DEL
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case 0x18: return 0x23; // Q
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case 0x19: return 0x12; // W
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case 0x1a: return 0x45; // E
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case 0x1b: return 0x13; // R
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case 0x1c: return 0x42; // T
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case 0x1d: return 0x41; // Y
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case 0x1e: return 0x32; // U
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case 0x1f: return 0x54; // I
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case 0x20: return 0x43; // O
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case 0x21: return 0x33; // P
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case 0x22: return 0x34; // (
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case 0x23: return 0x24; // )
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case 0x24: return 0x10; // Return
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case 0x25: return KBD_ALPHA; // LCTRL
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case 0x26: return 0x56; // A
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case 0x27: return 0x52; // S
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case 0x28: return 0x55; // D
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case 0x29: return 0x35; // F
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case 0x2a: return 0x25; // G
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case 0x2b: return 0x15; // H
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case 0x2c: return 0x44; // J
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case 0x2d: return 0x34; // K
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case 0x2e: return 0x24; // L
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case 0x2f: return 0x30; // :
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case 0x30: return 0x11; // "
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case 0x32: return KBD_2ND; // Lshift
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case 0x34: return 0x31; // Z
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case 0x35: return 0x51; // X
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case 0x36: return 0x36; // C
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case 0x37: return 0x22; // V
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case 0x38: return 0x46; // B
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case 0x39: return 0x53; // N
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case 0x3a: return 0x14; // M
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case 0x3b: return 0x44; // ,
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case 0x3c: return 0x30; // .
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case 0x3d: return 0x20; // ?
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case 0x41: return 0x40; // Space
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default: return 0;
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}
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}
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void create_window()
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{
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uint32_t mask;
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uint32_t values[2];
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/* Create the window */
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win = xcb_generate_id(conn);
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mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
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values[0] = screen->white_pixel;
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values[1] = XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_KEY_PRESS |
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XCB_EVENT_MASK_KEY_RELEASE;
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xcb_create_window(
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conn,
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screen->root_depth,
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win,
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screen->root,
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0, 0,
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500, 500,
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10,
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XCB_WINDOW_CLASS_INPUT_OUTPUT,
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screen->root_visual,
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mask, values);
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fg = xcb_generate_id(conn);
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mask = XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES;
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values[0] = screen->black_pixel;
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values[1] = 0;
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xcb_create_gc(conn, fg, screen->root, mask, values);
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/* Map the window on the screen */
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xcb_map_window(conn, win);
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}
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bool get_pixel(int x, int y)
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{
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return t6a04_pixel(&lcd, x, y);
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}
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void draw_pixels()
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{
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xcb_get_geometry_reply_t *geom;
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geom = xcb_get_geometry_reply(conn, xcb_get_geometry(conn, win), NULL);
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xcb_clear_area(
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conn, 0, win, 0, 0, geom->width, geom->height);
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// Figure out inner size to maximize a 96x64 screen (1.5 aspect ratio)
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int psize = geom->height / 64;
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if (geom->width / 96 < psize) {
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// width is the constraint
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psize = geom->width / 96;
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}
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int innerw = psize * 96;
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int innerh = psize * 64;
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int innerx = (geom->width - innerw) / 2;
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int innery = (geom->height - innerh) / 2;
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free(geom);
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int drawcnt = 0;
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for (int i=0; i<96; i++) {
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for (int j=0; j<64; j++) {
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if (get_pixel(i, j)) {
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int x = innerx + (i*psize);
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int y = innery + (j*psize);
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rectangles[drawcnt].x = x;
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rectangles[drawcnt].y = y;
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rectangles[drawcnt].height = psize;
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rectangles[drawcnt].width = psize;
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drawcnt++;
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}
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}
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}
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if (drawcnt) {
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xcb_poly_fill_rectangle(
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conn, win, fg, drawcnt, rectangles);
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}
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lcd_changed = false;
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xcb_flush(conn);
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}
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void event_loop()
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{
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while (1) {
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emul_step();
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if (lcd_changed) {
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// To avoid overdrawing, we'll let the CPU run a bit to finish its
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// drawing operation.
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emul_steps(100);
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draw_pixels();
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}
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// A low tech way of checking when the window was closed. The proper way
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// involving WM_DELETE is too complicated.
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xcb_get_geometry_reply_t *geom;
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geom = xcb_get_geometry_reply(conn, xcb_get_geometry(conn, win), NULL);
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if (geom == NULL) {
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return; // window has been closed.
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} else {
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free(geom);
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}
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xcb_generic_event_t *e = xcb_poll_for_event(conn);
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if (!e) {
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continue;
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}
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switch (e->response_type & ~0x80) {
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/* ESC to exit */
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case XCB_KEY_RELEASE:
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case XCB_KEY_PRESS: {
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xcb_key_press_event_t *ev = (xcb_key_press_event_t *)e;
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if (ev->detail == 0x09) return;
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if (ev->detail == 0x31 && e->response_type == XCB_KEY_PRESS) {
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// tilde, mapped to ON
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on_was_pressed = true;
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Z80INT(&m->cpu, 0);
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Z80Execute(&m->cpu); // unhalts the CPU
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}
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uint8_t key = keycode_to_tikbd(ev->detail);
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if (key) {
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kbd_setkey(&kbd, key, e->response_type == XCB_KEY_PRESS);
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}
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break;
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}
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case XCB_EXPOSE: {
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draw_pixels();
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break;
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}
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default: {
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break;
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}
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}
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free(e);
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}
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}
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int main(int argc, char *argv[])
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{
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if (argc != 2) {
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fprintf(stderr, "Usage: ./ti84 /path/to/rom\n");
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return 1;
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}
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FILE *fp = fopen(argv[1], "r");
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if (fp == NULL) {
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fprintf(stderr, "Can't open %s\n", argv[1]);
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return 1;
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}
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m = emul_init();
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m->ramstart = RAMSTART;
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int i = 0;
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int c;
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while ((c = fgetc(fp)) != EOF && i < MAX_ROMSIZE) {
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m->mem[i++] = c & 0xff;
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}
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pclose(fp);
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if (i == MAX_ROMSIZE) {
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fprintf(stderr, "ROM image too large.\n");
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return 1;
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}
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t6a04_init(&lcd);
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kbd_init(&kbd);
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lcd_changed = false;
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on_was_pressed = false;
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m->iord[KBD_PORT] = iord_kbd;
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m->iord[INTERRUPT_PORT] = iord_interrupt;
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m->iord[LCD_CMD_PORT] = iord_lcd_cmd;
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m->iord[LCD_DATA_PORT] = iord_lcd_data;
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m->iowr[KBD_PORT] = iowr_kbd;
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m->iowr[INTERRUPT_PORT] = iowr_interrupt;
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m->iowr[LCD_CMD_PORT] = iowr_lcd_cmd;
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m->iowr[LCD_DATA_PORT] = iowr_lcd_data;
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conn = xcb_connect(NULL, NULL);
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screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
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create_window();
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draw_pixels();
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event_loop();
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emul_printdebug();
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return 0;
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}
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