mirror of
https://github.com/bradgrantham/apple2e.git
synced 2024-08-19 01:28:58 +00:00
328 lines
7.3 KiB
C++
328 lines
7.3 KiB
C++
#include <cstdio>
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#include <cstdlib>
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#include <cctype>
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#include <deque>
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#include <string>
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#include <vector>
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#include <chrono>
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#include <iostream>
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#include <map>
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#include <signal.h>
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#include <termios.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "interface.h"
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using namespace std;
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namespace APPLE2Einterface
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{
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DisplayMode display_mode = TEXT;
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int display_page = 0; // Apple //e page minus 1 (so 0,1 not 1,2)
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bool mixed_mode = false;
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bool vid80 = false;
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bool altchar = false;
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static const int text_page1_base = 0x400;
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static const int text_page2_base = 0x800;
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static const int text_page_size = 0x400;
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unsigned char textport[2][24][40];
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deque<event> event_queue;
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bool force_caps_on = true;
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bool event_waiting()
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{
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return event_queue.size() > 0;
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}
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event dequeue_event()
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{
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if(event_waiting()) {
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event e = event_queue.front();
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event_queue.pop_front();
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return e;
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} else
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return {NONE, 0};
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}
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tuple<float,bool> get_paddle(int num)
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{
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if(num < 0 || num > 3)
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return make_tuple(-1, false);
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return make_tuple(0, false);
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}
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struct termios oldtermios;
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static int ttyraw(int fd)
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{
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/* Set terminal mode as follows:
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Noncanonical mode - turn off ICANON.
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Turn off signal-generation (ISIG)
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including BREAK character (BRKINT).
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Turn off any possible preprocessing of input (IEXTEN).
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Turn ECHO mode off.
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Disable CR-to-NL mapping on input.
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Disable input parity detection (INPCK).
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Disable stripping of eighth bit on input (ISTRIP).
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Disable flow control (IXON).
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Use eight bit characters (CS8).
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Disable parity checking (PARENB).
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Disable any implementation-dependent output processing (OPOST).
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One byte at a time input (MIN=1, TIME=0).
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*/
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// Save old settings.
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struct termios newtermios;
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if (tcgetattr(fd, &oldtermios) < 0) {
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return -1;
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}
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newtermios = oldtermios;
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newtermios.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
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/* OK, why IEXTEN? If IEXTEN is on, the DISCARD character
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is recognized and is not passed to the process. This
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character causes output to be suspended until another
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DISCARD is received. The DSUSP character for job control,
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the LNEXT character that removes any special meaning of
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the following character, the REPRINT character, and some
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others are also in this category.
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*/
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newtermios.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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/* If an input character arrives with the wrong parity, then INPCK
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is checked. If this flag is set, then IGNPAR is checked
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to see if input bytes with parity errors should be ignored.
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If it shouldn't be ignored, then PARMRK determines what
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character sequence the process will actually see.
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When we turn off IXON, the start and stop characters can be read.
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*/
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newtermios.c_cflag &= ~(CSIZE | PARENB);
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/* CSIZE is a mask that determines the number of bits per byte.
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PARENB enables parity checking on input and parity generation
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on output.
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*/
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newtermios.c_cflag |= CS8;
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/* Set 8 bits per character. */
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// newtermios.c_oflag &= ~(OPOST);
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/* This includes things like expanding tabs to spaces. */
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newtermios.c_cc[VMIN] = 1;
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newtermios.c_cc[VTIME] = 0;
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/* You tell me why TCSAFLUSH. */
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if (tcsetattr(fd, TCSAFLUSH, &newtermios) < 0) {
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return -1;
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}
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// Make the input non-blocking.
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fcntl(fd, F_SETFL, O_NONBLOCK);
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return 0;
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}
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int ttyreset(int fd)
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{
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if (tcsetattr(fd, TCSAFLUSH, &oldtermios) < 0) {
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return -1;
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}
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// Make blocking.
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fcntl(fd, F_SETFL, 0);
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return 0;
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}
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void start_keyboard()
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{
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// Set raw mode on stdin.
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if (ttyraw(0) < 0) {
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fprintf(stderr,"Can't go to raw mode.\n");
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exit(1);
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}
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}
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void stop_keyboard()
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{
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if (ttyreset(0) < 0) {
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fprintf(stderr, "Cannot reset terminal!\n");
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exit(-1);
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}
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}
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void start(bool run_fast, bool add_floppies, bool floppy0_inserted, bool floppy1_inserted)
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{
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event_queue.push_back({KEYDOWN, CAPS_LOCK});
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start_keyboard();
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}
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void apply_writes(void);
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void poll_keyboard()
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{
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int i;
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char c;
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while((i = read(0, &c, 1)) != -1) {
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bool control = false;
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int ch;
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if(c == '\r') {
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ch = ENTER;
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} else if(c >= 1 && c<= 26) {
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control = true;
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ch = 'A' + c - 1;
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} else {
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ch = c;
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}
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if(control)
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event_queue.push_back({KEYDOWN, LEFT_CONTROL});
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event_queue.push_back({KEYDOWN, ch});
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event_queue.push_back({KEYUP, ch});
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if(control)
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event_queue.push_back({KEYUP, LEFT_CONTROL});
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}
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if (errno == EAGAIN) {
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// Nothing to read.
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} else {
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printf("Got error reading from keyboard: %d\n\r", errno);
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exit(1);
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}
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}
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void iterate()
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{
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apply_writes();
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printf(".----------------------------------------.\n");
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for(int row = 0; row < 24; row++) {
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putchar('|');
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for(int col = 0; col < 40; col++) {
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int ch = textport[display_page][row][col] & 0x7F;
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printf("%c", isprint(ch) ? ch : '?');
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}
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puts("|");
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}
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printf("`----------------------------------------'\n");
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poll_keyboard();
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}
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void shutdown()
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{
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stop_keyboard();
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}
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void set_switches(DisplayMode mode_, bool mixed, int page, bool vid80_, bool altchar_)
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{
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display_mode = mode_;
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mixed_mode = mixed;
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display_page = page;
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vid80 = vid80_;
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altchar = altchar_;
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// XXX
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static bool altchar_warned = false;
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if(altchar && !altchar_warned) {
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fprintf(stderr, "Warning: ALTCHAR activated, is not implemented\n");
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altchar_warned = true;
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}
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}
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extern int text_row_base_offsets[24];
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map<int, unsigned char> writes;
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int collisions = 0;
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void write2(int addr, unsigned char data)
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{
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// We know text page 1 and 2 are contiguous
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if((addr >= text_page1_base) && (addr < text_page2_base + text_page_size)) {
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int page = (addr >= text_page2_base) ? 1 : 0;
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int within_page = addr - text_page1_base - page * text_page_size;
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for(int row = 0; row < 24; row++) {
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int row_offset = text_row_base_offsets[row];
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if((within_page >= row_offset) && (within_page < row_offset + 40)) {
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int col = within_page - row_offset;
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textport[page][row][col] = data;
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}
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}
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}
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}
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void apply_writes(void)
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{
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for(auto it : writes) {
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int addr = it.first;
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write2(addr, it.second);
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}
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writes.clear();
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collisions = 0;
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}
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bool write(int addr, bool aux, unsigned char data)
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{
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// We know text page 1 and 2 are contiguous
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if((addr >= text_page1_base) && (addr < text_page2_base + text_page_size)) {
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if(writes.find(addr) != writes.end())
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collisions++;
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writes[addr] = data;
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return true;
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}
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return false;
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}
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int text_row_base_offsets[24] =
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{
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0x000,
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0x080,
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0x100,
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0x180,
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0x200,
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0x280,
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0x300,
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0x380,
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0x028,
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0x0A8,
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0x128,
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0x1A8,
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0x228,
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0x2A8,
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0x328,
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0x3A8,
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0x050,
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0x0D0,
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0x150,
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0x1D0,
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0x250,
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0x2D0,
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0x350,
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0x3D0,
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};
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void show_floppy_activity(int number, bool activity)
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{
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}
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void enqueue_audio_samples(char *buf, size_t sz)
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{
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}
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};
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