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tek4010.c
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/*
* tek4010.c
*
* A tek4010/4014 graphics emulator
*
* Copyright 2019 rricharz
*
* https://github.com/rricharz/Tek4010
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*/
#define DEBUG 0 // print debug info
#define TODO (long)(16) // draw multiple objects until screen updates
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include "main.h"
#include "tube.h"
// mode handles the current state of the emulator:
//
// mode 0 alpha mode
//
// mode 1 expecting address byte of dark mode (move to) address
// mode 2 expecting second byte of dark mode (move to) address
// mode 3 expecting third byte of dark mode (move to) address
// mode 4 expecting fourth byte of dark mode (move to) address
// mode 5 expecting first byte of persistent vector end point address
// mode 6 expecting second byte of persistent vector end point address
// mode 7 expecting third byte of persistent vector end point address
// mode 8 expecting fourth byte of persistent vector end point address
//
// mode 30 expecting escape sequence, escape code received
// mode 31 received in ANSI escape sequence, escape sequence continues if next char is digit
//
// mode 40 incremental plot mode; is ignored until exit from incremental plot received
// mode 50 special point plot mode; not yet implemented
// mode 60 crosshair mode
// mode 101 ignore until group separator
int mode, savemode;
int penDown = 1;
extern int leftmargin;
extern FILE *putKeys;
static long startPaintTime;
static int xh,xl,yh,yl,xy4014;
static long todo;
static double efactor;
int ginCharacter[6] = {0, 0, 0, 0, 0, 0};
// table for special plot point mode
// 4014 manual page F-9
int intensityTable[] = {14,16,17,19, 20,22,23,25, 28,31,34,38, 41,33,47,50,
56,62,69,75, 81,88,94,100, 56,62,69,75, 81,88,96,100,
0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3,
4, 4, 4, 5, 5, 5, 6, 6, 7, 8, 9,10, 11,12,12,13,
14,16,17,19, 20,22,23,25, 28,31,34,38, 41,44,47,50,
56,62,69,75, 81,88,94,100, 56,63,69,75, 81,88};
void tek4010_checkLimits(cairo_t *cr, cairo_t *cr2)
/* check whether char is in visibel space */
{
/* don't check here for leftmargin, graphics needs to write characters to the whole screen */
if (tube_x0 < 0) tube_x0 = 0;
if (tube_x0 > windowWidth - hDotsPerChar) {
tube_x0 = leftmargin; tube_y0 -= vDotsPerChar;
}
if (tube_y0 < 4) { // new line at bottom of page
tube_y0 = windowHeight - vDotsPerChar;
if (leftmargin) leftmargin = 0;
else leftmargin = windowWidth / 2;
if (argAutoClear) {
leftmargin = 0;
tube_clearPersistent(cr,cr2);
}
/* check here for leftmargin */
if (tube_x0 < leftmargin) tube_x0 = leftmargin;
}
if (tube_y0 > (windowHeight - vDotsPerChar)) tube_y0 = windowHeight - vDotsPerChar;
}
void tek4010_bell()
{
// bell function, delay 0.05 sec
tube_u100ResetSeconds(1);
usleep(50000);
showCursor=0;
todo = 0;
}
void sendCoordinates()
{
// send 4 coordinate bytes
int x,y,ch;
x = (int)((double)tube_x0 / efactor);
y = (int)((double)tube_y0 / efactor);
if (DEBUG) printf("sendCoordinates, x=%d, y=%d\n", x, y);
ch = (x >> 5) + 0x20;
putc(ch, putKeys);
ginCharacter[4] = ch; // save to check for echo
ch = (x & 31) + 0x20;
putc(ch,putKeys);
ginCharacter[3] = ch; // save to check for echo
ch = (y >> 5) + 0x20;
putc(ch, putKeys);
ginCharacter[2] = ch; // save to check for echo
ch = (y & 31) + 0x20;
putc(ch,putKeys);
ginCharacter[1] = ch; // save to check for echo
}
void enqMode()
{
// activated by sending ESC ENQ
int status;
status = 0x20;
if (leftmargin == 0) status += 2;
if (mode == 0) status += 4;
putc(status,putKeys); // send status byte
sendCoordinates();
putc(13, putKeys); // cannot send a EOT here
}
void ginMode(cairo_t *cr, cairo_t *cr2)
{
// activated by sending ESC SUB
if (DEBUG) printf("GIN, mode = %d, isGinMode = %d\n", mode, isGinMode);
tube_crosshair(cr, cr2);
mode = 60;
todo = 0;
showCursor = 0;
isGinMode = 1;
}
void ginSend(int ch)
{
// user has stoken a key during GIN mode
if (DEBUG) printf("ginSend, ch = %d\n", ch);
putc(ch,putKeys); // user key stroke character
ginCharacter[5] = ch; // save to check for echo
sendCoordinates(); // 4 characters of packed coordinates
// cannot send a EOT here
// wait 5 ms, then send CR.
usleep(5000);
putc(13,putKeys); // cr
ginCharacter[0] = 13;
// prepare to suppress unwanted echoed characters.
isGinSuppress = 6;
}
void tek4010_clicked(int x, int y)
{
if (DEBUG) printf("Clicked, mode = %d\n", mode);
if (mode == 60) {
tube_x0 = x;
tube_y0 = y;
}
}
void tek4010_escapeCodeHandler(cairo_t *cr, cairo_t *cr2, int ch)
// handle escape sequencies, see 4014 user manual, table page G-1
// codes identical for all modes are handled elsewhere
{
switch (ch) {
case 0: break; // ignore filler 0
case 5: // ENQ: ask for status and position
enqMode();
mode = 0; break;
case 6: break;
case 8: // backspace during ESC
tube_x0 -= hDotsPerChar;
tek4010_checkLimits(cr, cr2);
mode = 0; break;
case 9: // tab during ESC
if (argTab1)
tube_x0 += hDotsPerChar;
else
tube_x0 = tube_x0 - (tube_x0 % (8 * hDotsPerChar)) + 8 * hDotsPerChar;
tek4010_checkLimits(cr, cr2);
mode = 0; break;
case 11:// VT during ESC, move one line up
tube_y0 += vDotsPerChar;
tek4010_checkLimits(cr, cr2);
mode = 0; break;
case 12:// FF during ESC
if (!argKeepSize)
tube_changeCharacterSize(cr, cr2, 74, 35, efactor);
tube_clearPersistent(cr,cr2);
mode = 0; break;
case 13:mode = 0; break;
case 14: // SO activate alternative char set
if (argAPL) { // switch only of argAPL is set
aplMode = 1;
// printf("Setting APL mode to 1 from computer\n");
}
mode = 0;
todo = 0;
break;
case 15: // SI deactivate alternative char set
aplMode = 0;
mode = 0;
todo = 0;
// printf("Setting APL mode to 0 from computer\n");
break;
case 23: system("scrot --focussed"); mode= 0; break;
case 26: // sub
ginMode(cr, cr2);
break;
// modes 27 and 29 - 31 are identical in all modes
case 28: // record separator
if (DEBUG) printf("Special point plot mode, mode=%d\n",savemode);
mode = 50; // for the intensity/focus character
specialPlotMode = 1;
double intensity = 1.0;
int defocussed = 0;
break;
case '8': tube_changeCharacterSize(cr, cr2, 74, 35, efactor); mode = 0; break;
case '9': tube_changeCharacterSize(cr, cr2, 81, 38, efactor * 0.9); mode = 0; break;
case ':': tube_changeCharacterSize(cr, cr2, 121, 58, efactor * 0.65); mode = 0; break;
case ';': tube_changeCharacterSize(cr, cr2, 133, 64, efactor * 0.55); mode = 0; break;
case '[': // a second escape code follows, do not reset mode
break;
// normal mode
case '`': ltype = SOLID; writeThroughMode = 0; mode = 0; break;
case 'a': ltype = DOTTED; writeThroughMode = 0; mode = 0; break;
case 'b': ltype = DOTDASH; writeThroughMode = 0; mode = 0; break;
case 'c': ltype = SHORTDASH;writeThroughMode = 0; mode = 0; break;
case 'd': ltype = LONGDASH; writeThroughMode = 0; mode = 0; break;
case 'e': ltype = SOLID; writeThroughMode = 0; mode = 0; break;
case 'f': ltype = SOLID; writeThroughMode = 0; mode = 0; break;
case 'g': ltype = SOLID; writeThroughMode = 0; mode = 0; break;
// defocussed mode
case 'h':
case 'i':
case 'j':
case 'k':
case 'l':
case 'm':
case 'n':
case 'o': if (DEBUG) printf("Defocussed mode ESC %c not supported, ignored\n", ch);
mode = 101; break;
// write-trough mode
case 'p': ltype = SOLID; writeThroughMode = 1; mode = 101; showCursor = 0; break;
case 'q': ltype = DOTTED; writeThroughMode = 1; mode = 101; showCursor = 0; break;
case 'r': ltype = DOTDASH; writeThroughMode = 1; mode = 101; showCursor = 0; break;
case 's': ltype = SHORTDASH;writeThroughMode = 1; mode = 101; showCursor = 0; break;
case 't': ltype = LONGDASH; writeThroughMode = 1; mode = 101; showCursor = 0; break;
case 'u': ltype = SOLID; writeThroughMode = 1; mode = 101; showCursor = 0; break;
case 'v': ltype = SOLID; writeThroughMode = 1; mode = 101; showCursor = 0; break;
case 'w': ltype = SOLID; writeThroughMode = 1; mode = 101; showCursor = 0; break;
default:
if (DEBUG) printf("ESC %d not supported, ignored\n",ch);
mode = 0;
break;
}
}
int tek4010_checkReturnToAlpha(int ch)
// test for return to alpha character set
// see 4014 manual, page F-10, note 1
{
if ((ch==31) || (ch==13) || (ch==27) || (ch==12)) {
if (DEBUG && mode) printf("Going to alpha mode\n");
mode = 0;
showCursor = 0;
if (ch == 12) {
tube_doClearPersistent = 1;
todo = 0;
}
if (ch == 27) {
mode = 30;
todo = 0;
}
plotPointMode = 0;
specialPlotMode = 0;
if (isGinMode && DEBUG)
printf("clearing isGinMode, char = %d\n", ch);
isGinMode = 0;
return 1;
}
else return 0;
}
void tek4010_draw(cairo_t *cr, cairo_t *cr2, int first)
// draw onto the main window using cairo
// cr is used for persistent drawing, cr2 for temporary drawing
{
int ch, tag;
refreshCount++;
if (first) {
first = 0;
efactor = windowWidth / 1024.0;
refresh_interval = 30;
tube_changeCharacterSize(cr, cr2, 74, 35, efactor);
if (windowWidth != 1024) printf("Scaling: %0.3f\n", efactor / 4.0);
}
startPaintTime = tube_mSeconds(); // start to measure time for this draw operation
showCursor = 1;
isBrightSpot = 0;
// clear the second surface
tube_clearSecond(cr2);
// clear persistent surface, if necessary
if (tube_doClearPersistent) {
tube_clearPersistent(cr,cr2);
if (!argKeepSize)
tube_changeCharacterSize(cr, cr2, 74, 35, efactor);
}
if (aplMode)
tube_setupPainting(cr, cr2, APL_FONT);
else
tube_setupPainting(cr, cr2, STANDARD_FONT);
if (plotPointMode)
todo = 16 * TODO;
else if (writeThroughMode)
todo = 8 * TODO;
else if (mode == 0)
todo = 4 * TODO; // for text speed
else
todo = TODO;
do {
ch = tube_getInputChar();
if (tube_isInput() == 0) {
todo = 0;
}
if (ch == -1) {
if ((mode == 0) && showCursor) tube_doCursor(cr2);
if (mode != 60) return; // no char available, need to allow for updates
}
// Try suppressing GIN echoed characters here.
if (isGinSuppress){
if (ch == 10) // additional line feed may be echoed if cr is typed
return;
if ((ch & 0x7F) == ginCharacter[isGinSuppress - 1]) {
if (DEBUG) printf( "isGinSuppress (%d): suppressing: %d\n",
isGinSuppress, ch);
isGinSuppress --;
return;
}
else {
if (DEBUG) printf("isGinSuppress, characters are different (%d,%d)\n",
ch & 0x7F, ginCharacter[isGinSuppress - 1]);
isGinSuppress = 0;
}
}
// if (aplMode) printf("Receiving character %d from host\n", ch);
if (DEBUG) {
printf("mode=%d, ch code %02X",mode,ch);
if ((ch>0x20)&&(ch<=0x7E)) printf(" (%c)",ch);
printf("\n");
}
if (tek4010_checkReturnToAlpha(ch)) {
todo = todo - 4;
goto endDo;
}
// the following chars are identical in all modes (with exception: 13,28)
// see 4014 user manual, table on page G1 ff
switch (ch) {
case 7: tek4010_bell();
goto endDo;
case 10: // new line
tube_y0 -= vDotsPerChar;
if (!argRaw) tube_x0 = leftmargin;
tek4010_checkLimits(cr, cr2);
goto endDo;
case 13: // return
if (mode != 30) { // special handling in ESC mode
mode = 0; tube_x0 = leftmargin;
goto endDo;
}
break;
case 27: // escape code, all modes
savemode = mode;
mode = 30;
goto endDo;
case 28: // file separator >> point plot mode
if (mode != 30) { // special handling in ESC mode
mode = 5;
plotPointMode= 1;
goto endDo;
}
break;
case 29: // group separator >> graphics mode
mode = 1;
plotPointMode = 0;
goto endDo;
case 30: // record separator >> incremental plot mode
if (DEBUG) printf("Incremental point plot mode\n");
penDown = 1;
mode = 40;
goto endDo;
case 31: // US, normal mode
mode = 0;
goto endDo;
}
// handle skipping coordinate bytes
// this cannot be done in switch(mode) below, because multiple bytes
// can be skipped and the current byte must be executed after a mode change
tag = (ch >> 5) & 3;
if ((mode >= 1) && (mode <= 8)) {
if ((mode == 5) && (ch == 29)) {
if (DEBUG) printf("group separator, go from mode 5 to mode 1\n");
mode = 1;
goto endDo; // goto end of do loop
}
if (DEBUG) {
if (mode & 1)
printf(" mode=%d,tag=%d-H-val=%d,",
mode,tag, 32 * (ch & 31));
else
printf(" mode=%d,tag=%d-L-val=%d,",
mode,tag, ch & 31);
printf("xh=%d,xl=%d,yh=%d,yl=%d\n",xh,xl,yh,yl);
}
if (tag != 0) {
if ((mode == 1) && (tag != 1)) mode = 2;
if ((mode == 3) && (tag == 3)) {
// this overwrites the extra data byte of the 4014 for the
// persistent mode ccordinates and stores it for further use
mode = 2;
xy4014 = yl;
if (DEBUG)
printf("4014 coordinates, overwrite last value\n");
}
if ((mode == 2) && (tag != 3)) mode = 3;
if ((mode == 3) && (tag != 1)) mode = 4;
if ((mode == 5) && (tag != 1)) mode = 6;
if ((mode == 7) && (tag == 3)) {
// this overwrites the extra data byte of the 4014 for the
// persistent mode ccordinates and stores it for further use
mode = 6;
xy4014 = yl;
if (DEBUG)
printf("4014 coordinates, overwrite last value\n");
}
if ((mode == 6) && (tag != 3)) mode = 7;
if ((mode == 7) && (tag != 1)) mode = 8;
}
else {
if (ch == 0) return;
if (ch == 29) mode = 1; // group separator
else if (ch == 28) { plotPointMode = 1; todo = 16 * todo; }
else if (DEBUG) printf("Plot mode, unknown char %d, plotPointMode = %d\n",ch,plotPointMode);
return;
}
}
// handling anything specific to a mode
switch (mode) {
case 1: plotPointMode = 0; // normal graphics mode, starting coordinates
yh = 32 * (ch & 31); mode++;
if (DEBUG) printf("setting yh to %d\n", yh);
break;
case 2: yl = (ch & 31);
if (windowWidth != 1024) {
int yb = (xy4014 >> 2) & 3;
tube_y0 = (int)(efactor * (double)(((yh+yl) << 2) + yb) / 4.0);
}
else tube_y0 = yh + yl;
mode++;
if (DEBUG) printf("setting yl to %d\n", yl);
break;
case 3: if (tag == 1) xh = 32 * (ch & 31); mode++;
if (DEBUG) printf("setting xh to %d\n", xh);
break;
case 4: xl = (ch & 31);
if (windowWidth != 1024) {
int xb = xy4014 & 3;
tube_x0 = (int)(efactor * (double)(((xh+xl) << 2) + xb) / 4.0);
}
else tube_x0 = xh + xl;
mode++;
tube_emulateDeflectionTime();
if (DEBUG) printf("setting xl to %d\n", xl);
if (DEBUG) printf("******************************************** Moving to (%d,%d)\n",tube_x0,tube_y0);
break;
case 5: if (ch == 29) {
if (DEBUG) printf("setting mode to 1\n");
mode = 1;
}
else if (tag != 0) {
yh = 32 * (ch & 31); mode++;
}
else if (DEBUG) printf("case 5: tag is 0\n");
if (DEBUG) printf(">>>>>yh=%d\n",yh);
break;
case 6: yl = (ch & 31); mode++;
break;
if (DEBUG) printf(">>>>>yl=%d\n",yl);
case 7: xh = 32 * (ch & 31); mode++;
break;
if (DEBUG) printf(">>>>>xh=%d\n",xh);
case 8: xl = (ch & 31);
if (windowWidth != 1024) {
int xb = xy4014 & 3;
tube_x2 = (int)(efactor * (double)(((xh+xl) << 2) + xb) / 4.0);
int yb = (xy4014 >> 2) & 3;
tube_y2 = (int)(efactor * (double)(((yh+yl) << 2) + yb) / 4.0);
}
else {
tube_x2 = xh + xl;
tube_y2 = yh + yl;
}
if (DEBUG) printf(">>>>>xl=%d\n",xl);
if (plotPointMode>0.0) {
// draw the point
tube_drawPoint(cr, cr2);
todo--;
}
else {
tube_drawVector(cr,cr2);
todo--;
}
showCursor = 0;
tube_x0 = tube_x2; // prepare for additional vectors
tube_y0 = tube_y2;
if (specialPlotMode) mode = 50; // another intensity/focus char follows
else mode = 5;
break;
case 30: // escape code handler
tek4010_escapeCodeHandler(cr, cr2, ch);
break;
case 40: // incremental plot mode
tek4010_checkReturnToAlpha(ch); // check for exit
if (DEBUG) printf("Incremental plot mode, ch = %d, penDown = %d\n",ch, penDown);
if (ch == 32) penDown = 0;
else if (ch == 80) penDown = 1;
else if ((ch & 0x70) == 0x40){
if (ch & 4) tube_y0++;
if (ch & 1) tube_x0++;
if (ch & 8) tube_y0--;
if (ch & 2) tube_x0--;
if (DEBUG) printf("point (%d,%d)\n", tube_x0, tube_y0);
tube_x2 = tube_x0;
tube_y2 = tube_y0;
if (penDown) tube_drawPoint(cr, cr2);
}
else if (DEBUG) printf("Illegal byte 0x%02X in incremental plot\n", ch);
break;
case 50:// special plot mode
tag = ch >> 5;
if ((ch < 32) || (ch >= 126)) return;
if (DEBUG) printf("intensity/focus control = %c: %d: ", ch, tag);
defocussed = (tag == 1);
intensity = intensityTable[ch - 32];
if (DEBUG) printf("defocussed = %d, intensity = %d%%\n", defocussed, intensity);
mode = 5; // coordinates follow
break;
case 60:// crosshair mode
if (isGinMode > 1) { // key stroken by user
ginSend(isGinMode);
mode = 0;
todo = 0;
if (DEBUG) printf("GIN: key stroken by user, exiting GIN mode\n");
isGinMode = 0;
}
else
ginMode(cr, cr2);
break;
case 101:
if (DEBUG) printf("Ignore until group separator, ch = %02x\n", ch);
if (ch == 29) mode = 1;
break;
case 0: // handle ALPHA mode; 4014 user manual, table page G-1
// some characters are indentical for all modes and handled elsewhere
switch (ch) {
case 0: break;
case 8: // backspace
tube_x0 -= hDotsPerChar;
tek4010_checkLimits(cr, cr2);
break;
case 9: // tab
if (argTab1)
tube_x0 += hDotsPerChar;
else
tube_x0 = tube_x0 - (tube_x0 % (8 * hDotsPerChar)) + 8 * hDotsPerChar;
tek4010_checkLimits(cr, cr2);
break;
case 11: // VT, move one line up
tube_y0 += vDotsPerChar;
tek4010_checkLimits(cr, cr2);
break;
case 23: // ctrl-w screen dump
system("scrot --focussed");
break;
default: if ((ch >= 32) && (ch <127)) { // printable character
tek4010_checkLimits(cr, cr2);
tube_drawCharacter(cr,cr2, ch);
todo-= 2;
}
break;
}
break;
default: if (DEBUG) 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);
}