mirror of
https://github.com/rricharz/Tek4010.git
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545 lines
25 KiB
C
Executable File
545 lines
25 KiB
C
Executable File
/*
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* tek4010.c
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*
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* A tek4010/4014 graphics emulator
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*
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* Copyright 2019 rricharz
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*
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* https://github.com/rricharz/Tek4010
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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#define DEBUG 0 // print debug info
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#define TODO (long)(8.0 * efactor * efactor) // draw multiple objects until screen updates
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/time.h>
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#include "main.h"
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#include "tube.h"
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// mode handles the current state of the emulator:
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//
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// mode 0 alpha mode
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//
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// mode 1 expecting address byte of dark mode (move to) address
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// mode 2 expecting second byte of dark mode (move to) address
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// mode 3 expecting third byte of dark mode (move to) address
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// mode 4 expecting fourth byte of dark mode (move to) address
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// mode 5 expecting first byte of persistent vector end point address
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// mode 6 expecting second byte of persistent vector end point address
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// mode 7 expecting third byte of persistent vector end point address
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// mode 8 expecting fourth byte of persistent vector end point address
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//
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// mode 30 expecting escape sequence, escape code received
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// mode 31 received in ANSI escape sequence, escape sequence continues if next char is digit
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//
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// mode 40 incremental plot mode; is ignored until exit from incremental plot received
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// mode 50 special point plot mode; not yet implemented
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// mode 101 ignore until group separator
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int mode, savemode;
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extern int leftmargin;
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static long startPaintTime;
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static int xh,xl,yh,yl,xy4014;
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static long todo;
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void tek4010_checkLimits()
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/* check whether char is in visibel space */
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{
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/* don't check here for leftmargin, graphics needs to write characters to the whole screen */
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if (tube_x0 < 0) tube_x0 = 0;
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if (tube_x0 > windowWidth - hDotsPerChar) {
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tube_x0 = leftmargin; tube_y0 -= vDotsPerChar;
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}
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if (tube_y0 < 4) {
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tube_y0 = windowHeight - vDotsPerChar;
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if (leftmargin) leftmargin = 0;
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else leftmargin = windowWidth / 2;
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/* check here for leftmargin */
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if (tube_x0 < leftmargin) tube_x0 = leftmargin;
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}
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if (tube_y0 > (windowHeight - vDotsPerChar)) tube_y0 = windowHeight - vDotsPerChar;
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}
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void tek4010_bell()
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{
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// bell function, delay 0.1 sec
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tube_u100ResetSeconds(1);
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usleep(50000);
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showCursor=0;
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todo = 0;
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}
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void tek4010_escapeCodeHandler(cairo_t *cr, cairo_t *cr2, int ch)
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// handle escape sequencies, see 4014 user manual, table page G-1
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// codes identical for all modes are handled elsewhere
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{
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switch (ch) {
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case 0: break; // ignore filler 0
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case 5: // ENQ: ask for status and position
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// not yet implemented, needs to send 7 bytes
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printf("ENQ not supported, ignored\n");
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mode = 0; break;
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case 6: break;
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case 8: // backspace during ESC
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tube_x0 -= hDotsPerChar;
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tek4010_checkLimits();
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mode = 0; break;
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case 9: // tab during ESC
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if (argTab1)
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tube_x0 += hDotsPerChar;
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else
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tube_x0 = tube_x0 - (tube_x0 % (8 * hDotsPerChar)) + 8 * hDotsPerChar;
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tek4010_checkLimits();
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mode = 0; break;
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case 11:// VT during ESC, move one line up
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tube_y0 += vDotsPerChar;
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tek4010_checkLimits();
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mode = 0; break;
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case 12:// FF during ESC
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tube_changeCharacterSize(cr, cr2, 74, 35, (int) (18.0 * efactor));
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tube_clearPersistent(cr,cr2);
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mode = 0; break;
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case 13:mode = 0; break;
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case 14: // SO activate alternative char set, not implemented
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case 15: // SI deactivate alternative char set, not implemented
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break;
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case 23: system("scrot --focussed"); mode= 0; break;
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case 26: // sub
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printf("GIN mode not supported, ignored\n");
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mode = 50;
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break;
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// modes 27 and 29 - 31 are identical in all modes
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case 28: // record sepatator
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printf("Special point plot mode not supported, ignored\n");
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mode = 50;
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break;
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case '8': tube_changeCharacterSize(cr, cr2, 74, 35, (int)(efactor * 18)); break;
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case '9': tube_changeCharacterSize(cr, cr2, 81, 38, (int)(efactor * 16)); break;
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case ':': tube_changeCharacterSize(cr, cr2, 121, 58, (int)(efactor * 11)); break;
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case ';': tube_changeCharacterSize(cr, cr2, 133, 64, (int)(efactor * 10)); break;
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case '[': // a second escape code follows, do not reset mode
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break;
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// normal mode
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case '`': ltype = SOLID; writeThroughMode = 0; mode = 0; break;
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case 'a': ltype = DOTTED; writeThroughMode = 0; mode = 0; break;
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case 'b': ltype = DOTDASH; writeThroughMode = 0; mode = 0; break;
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case 'c': ltype = SHORTDASH;writeThroughMode = 0; mode = 0; break;
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case 'd': ltype = LONGDASH; writeThroughMode = 0; mode = 0; break;
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case 'e': ltype = SOLID; writeThroughMode = 0; mode = 0; break;
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case 'f': ltype = SOLID; writeThroughMode = 0; mode = 0; break;
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case 'g': ltype = SOLID; writeThroughMode = 0; mode = 0; break;
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// defocussed mode
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case 'h':
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case 'i':
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case 'j':
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case 'k':
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case 'l':
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case 'm':
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case 'n':
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case 'o': printf("Defocussed mode ESC %c not supported, ignored\n", ch); mode = 101; break;
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// write-trough mode
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case 'p': ltype = SOLID; writeThroughMode = 1; mode = 101; showCursor = 0; break;
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case 'q': ltype = DOTTED; writeThroughMode = 1; mode = 101; showCursor = 0; break;
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case 'r': ltype = DOTDASH; writeThroughMode = 1; mode = 101; showCursor = 0; break;
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case 's': ltype = SHORTDASH;writeThroughMode = 1; mode = 101; showCursor = 0; break;
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case 't': ltype = LONGDASH; writeThroughMode = 1; mode = 101; showCursor = 0; break;
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case 'u': ltype = SOLID; writeThroughMode = 1; mode = 101; showCursor = 0; break;
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case 'v': ltype = SOLID; writeThroughMode = 1; mode = 101; showCursor = 0; break;
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case 'w': ltype = SOLID; writeThroughMode = 1; mode = 101; showCursor = 0; break;
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default:
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printf("ESC %d not supported, ignored\n",ch);
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mode = 0;
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break;
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}
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}
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int tek4010_checkReturnToAlpha(int ch)
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// test for return to alpha character set
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// see 4014 manual, page F-10, note 1
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{
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if ((ch==31) || (ch==13) || (ch==27) || (ch==12)) {
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if (DEBUG && mode) printf("Going to alpha mode\n");
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mode = 0;
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showCursor = 0;
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if (ch == 12) {
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tube_doClearPersistent = 1;
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todo = 0;
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}
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if (ch == 27) {
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mode = 30;
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todo = 0;
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}
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plotPointMode = 0;
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return 1;
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}
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else return 0;
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}
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void tek4010_draw(cairo_t *cr, cairo_t *cr2, int first)
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// draw onto the main window using cairo
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// cr is used for persistent drawing, cr2 for temporary drawing
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{
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int ch;
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refreshCount++;
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if (first) {
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first = 0;
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int actualWidth;
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if (argFull) {
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efactor = windowHeight / 780.0;
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actualWidth = (int)(efactor * 1024.0);
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eoffx = (windowWidth - actualWidth) / 2;
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refresh_interval = (int)(30.0 * efactor * efactor);
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}
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else {
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efactor = 1.0;
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actualWidth = windowWidth;
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eoffx = 0;
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refresh_interval = 30;
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}
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windowWidth = actualWidth;
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tube_changeCharacterSize(cr, cr2, 74, 35, (int) (18.0 * efactor));
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// printf("Scaling: %0.2f\n", efactor);
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// printf("Offset: %d\n",eoffx);
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// printf("Refresh interval: %d\n",refresh_interval);
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}
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startPaintTime = tube_mSeconds(); // start to measure time for this draw operation
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showCursor = 1;
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isBrightSpot = 0;
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// clear the second surface
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tube_clearSecond(cr2);
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// clear persistent surface, if necessary
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if (tube_doClearPersistent) {
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tube_clearPersistent(cr,cr2);
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tube_changeCharacterSize(cr, cr2, 74, 35, (int) (18.0 * efactor));
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}
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tube_setupPainting(cr, cr2, "Monospace");
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if (plotPointMode)
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todo = 16 * TODO;
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else if (writeThroughMode)
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todo = 8 * TODO;
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else if (mode == 0)
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todo = 4 * TODO; // for text speed
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else
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todo = TODO;
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do {
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ch = tube_getInputChar();
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if (tube_isInput() == 0) {
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todo = 0;
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}
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if (ch == -1) {
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if ((mode == 0) && showCursor) tube_doCursor(cr2);
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return; // no char available, need to allow for updates
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}
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if (DEBUG) {
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printf("mode=%d, ch code %02X",mode,ch);
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if ((ch>0x20)&&(ch<=0x7E)) printf(" (%c)",ch);
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printf("\n");
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}
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if (tek4010_checkReturnToAlpha(ch)) {
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todo = todo - 4;
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goto endDo;
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}
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// the following chars are identical in all modes (with exception: 13,28)
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// see 4014 user manual, table on page G1 ff
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switch (ch) {
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case 7: tek4010_bell();
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goto endDo;
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case 10: // new line
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tube_y0 -= vDotsPerChar;
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if (!argRaw) tube_x0 = leftmargin;
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tek4010_checkLimits();
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goto endDo;
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case 13: // return
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if (mode != 30) { // special handling in ESC mode
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mode = 0; tube_x0 = leftmargin;
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goto endDo;
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}
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break;
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case 27: // escape code, all modes
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savemode = mode;
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mode = 30;
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goto endDo;
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case 28: // file separator >> point plot mode
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if (mode != 30) { // special handling in ESC mode
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mode = 5;
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plotPointMode= 1;
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goto endDo;
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}
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break;
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case 29: // group separator >> graphics mode
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mode = 1;
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plotPointMode = 0;
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goto endDo;
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case 30: // record separator >> incremental mode
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printf("Special point plot mode not supported, ignored\n");
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mode = 40;
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goto endDo;
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case 31: // US, normal mode
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mode = 0;
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goto endDo;
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}
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// handle skipping coordinate bytes
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// this cannot be done in switch(mode) below, because multiple bytes
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// can be skipped and the current byte must be executed after a mode change
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int tag = (ch >> 5) & 3;
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if ((mode >= 1) && (mode <= 8)) {
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if ((mode == 5) && (ch == 29)) {
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if (DEBUG) printf("group separator, go from mode 5 to mode 1\n");
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mode = 1;
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goto endDo; // goto end of do loop
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}
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if (DEBUG) {
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if (mode & 1)
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printf(" mode=%d,tag=%d-H-val=%d,",
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mode,tag, 32 * (ch & 31));
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else
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printf(" mode=%d,tag=%d-L-val=%d,",
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mode,tag, ch & 31);
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printf("xh=%d,xl=%d,yh=%d,yl=%d\n",xh,xl,yh,yl);
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}
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if (tag != 0) {
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if ((mode == 1) && (tag != 1)) mode = 2;
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if ((mode == 3) && (tag == 3)) {
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// this overwrites the extra data byte of the 4014 for the
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// persistent mode ccordinates and stores it for further use
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mode = 2;
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xy4014 = yl;
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if (DEBUG)
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printf("4014 coordinates, overwrite last value\n");
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}
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if ((mode == 2) && (tag != 3)) mode = 3;
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if ((mode == 3) && (tag != 1)) mode = 4;
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if ((mode == 5) && (tag != 1)) mode = 6;
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if ((mode == 7) && (tag == 3)) {
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// this overwrites the extra data byte of the 4014 for the
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// persistent mode ccordinates and stores it for further use
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mode = 6;
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xy4014 = yl;
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if (DEBUG)
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printf("4014 coordinates, overwrite last value\n");
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}
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if ((mode == 6) && (tag != 3)) mode = 7;
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if ((mode == 7) && (tag != 1)) mode = 8;
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}
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else {
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if (ch == 0) return;
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if (ch == 29) mode = 1; // group separator
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else if (ch == 28) { plotPointMode = 1; todo = 16 * todo; }
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else printf("Plot mode, unknown char %d, plotPointMode = %d\n",ch,plotPointMode);
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return;
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}
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}
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// handling anything specific to a mode
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switch (mode) {
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case 1: plotPointMode = 0; // normal graphics mode, starting coordinates
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yh = 32 * (ch & 31); mode++;
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if (DEBUG) printf("setting yh to %d\n", yh);
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break;
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case 2: yl = (ch & 31);
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if (argFull) {
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int yb = (xy4014 >> 2) & 3;
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tube_y0 = (int)(efactor * (double)(((yh+yl) << 2) + yb) / 4.0);
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}
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else tube_y0 = yh + yl;
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mode++;
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if (DEBUG) printf("setting yl to %d\n", yl);
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break;
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case 3: if (tag == 1) xh = 32 * (ch & 31); mode++;
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if (DEBUG) printf("setting xh to %d\n", xh);
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break;
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case 4: xl = (ch & 31);
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if (argFull) {
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int xb = xy4014 & 3;
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tube_x0 = (int)(efactor * (double)(((xh+xl) << 2) + xb) / 4.0);
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}
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else tube_x0 = xh + xl;
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mode++;
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tube_emulateDeflectionTime();
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if (DEBUG) printf("setting xl to %d\n", xl);
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if (DEBUG) printf("******************************************** Moving to (%d,%d)\n",tube_x0,tube_y0);
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break;
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case 5: if (ch == 29) {
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if (DEBUG) printf("setting mode to 1\n");
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mode = 1;
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}
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else if (tag != 0) {
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yh = 32 * (ch & 31); mode++;
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}
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else printf("case 5: tag is 0\n");
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if (DEBUG) printf(">>>>>yh=%d\n",yh);
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break;
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case 6: yl = (ch & 31); mode++;
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break;
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if (DEBUG) printf(">>>>>yl=%d\n",yl);
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case 7: xh = 32 * (ch & 31); mode++;
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break;
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if (DEBUG) printf(">>>>>xh=%d\n",xh);
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case 8: xl = (ch & 31);
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if (argFull) {
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int xb = xy4014 & 3;
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tube_x2 = (int)(efactor * (double)(((xh+xl) << 2) + xb) / 4.0);
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int yb = (xy4014 >> 2) & 3;
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tube_y2 = (int)(efactor * (double)(((yh+yl) << 2) + yb) / 4.0);
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}
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else {
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tube_x2 = xh + xl;
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tube_y2 = yh + yl;
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}
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if (DEBUG) printf(">>>>>xl=%d\n",xl);
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if (plotPointMode>0.0) {
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tube_drawPoint(cr, cr2);
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// draw the point
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mode = 50;
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todo--;
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}
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else {
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tube_drawVector(cr,cr2);
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todo--;
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}
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showCursor = 0;
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tube_x0 = tube_x2; // prepare for additional vectors
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tube_y0 = tube_y2;
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mode = 5;
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break;
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case 30:
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tek4010_escapeCodeHandler(cr, cr2, ch);
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break;
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case 40: // incremental plot mode, not implemented
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tek4010_checkReturnToAlpha(ch); // check for exit
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break;
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case 50: // incremental plot mode, not implemented
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tek4010_checkReturnToAlpha(ch); // check for exit
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break;
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case 101:
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if (DEBUG) printf("Ignore until group separator, ch = %02x\n", ch);
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if (ch == 29) mode = 1;
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break;
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case 0: // handle ALPHA mode; 4014 user manual, table page G-1
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// some characters are indentical for all modes and handled elsewhere
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switch (ch) {
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case 0: break;
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case 8: // backspace
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tube_x0 -= hDotsPerChar;
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tek4010_checkLimits();
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break;
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|
case 9: // tab
|
|
if (argTab1)
|
|
tube_x0 += hDotsPerChar;
|
|
else
|
|
tube_x0 = tube_x0 - (tube_x0 % (8 * hDotsPerChar)) + 8 * hDotsPerChar;
|
|
tek4010_checkLimits();
|
|
break;
|
|
case 11: // VT, move one line up
|
|
tube_y0 += vDotsPerChar;
|
|
tek4010_checkLimits();
|
|
break;
|
|
case 23: // ctrl-w screen dump
|
|
system("scrot --focussed");
|
|
break;
|
|
|
|
default: if ((ch >= 32) && (ch <127)) { // printable character
|
|
tek4010_checkLimits();
|
|
tube_drawCharacter(cr,cr2, ch);
|
|
todo-= 2;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
default: printf("Illegal mode - this is a tek4010decoder error and should not happen\n");
|
|
break;
|
|
}
|
|
endDo:;
|
|
}
|
|
while ((todo > 0) && ((tube_mSeconds() - startPaintTime) < refresh_interval));
|
|
|
|
// display cursor
|
|
|
|
if (showCursor && (tube_isInput() == 0)) tube_doCursor(cr2);
|
|
|
|
}
|