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// ncurses.c
// Implements interface.h
// Provides an in-terminal interface to the emulator.
#include<ncurses.h>
#include"interface.h"
#include"../apple.h"
#include"../cpu/6502.h"
int TermX = 0;
int TermY = 0;
WINDOW *AppleWindow;
const byte* VRAM;
byte* VRAM_Position;
int VRAM_Offset;
void PrintInfo()
{
mvprintw(2, 43, " acc : %02x", acc);
mvprintw(3, 43, " X : %02x", X );
mvprintw(4, 43, " Y : %02x", Y );
mvprintw(5, 43, " PC : %04x", PC);
mvprintw(6, 43, " S : %02x", S );
mvprintw(7, 43, "Flags : %c%c_%c%c%c%c%c",
getFlag(flag_N) ? 'N':'.' ,
getFlag(flag_V) ? 'V':'.' ,
getFlag(flag_B) ? 'B':'.' ,
getFlag(flag_D) ? 'D':'.' ,
getFlag(flag_I) ? 'I':'.' ,
getFlag(flag_Z) ? 'Z':'.' ,
getFlag(flag_C) ? 'C':'.'
);
mvprintw(2, 65, "Stack");
int count = 3;
for (int i = 0x1ff; i > 0x1e8; i--) {
if (i == (0x1ff-S)) // Indicate the stack pointer!
attron(A_REVERSE);
mvprintw(count, 65, "%x : %x", i, GetMemory(i));
attroff(A_REVERSE);
count++;
}
refresh();
}
void DisplayInit()
{
// ncurses initialization functions.
initscr();
cbreak();
noecho();
curs_set(0);
keypad(stdscr, TRUE);
// Draw decorative border.
attron(A_REVERSE);
move(0, 0);
printw(" ");
for (int i = 1; i <= 24; i++)
{
mvaddch(i, 0, ' ');
mvaddch(i, 41, ' ');
}
mvprintw(25, 0, " ~ ");
mvprintw(26, 0, " Alekseis Apple I ");
mvprintw(27, 0, " ");
attroff(A_REVERSE);
// Create seperate Apple screen window.
AppleWindow = newwin(24, 40, 1, 1);
// @ prompt.
mvwaddch(AppleWindow, TermY, TermX, '@' | A_BLINK);
// Initialize the terminal shift register variables.
VRAM = (byte*)malloc(960);
VRAM_Position = VRAM;
VRAM_Offset = 0;
refresh();
}
void DisplayClose()
{
free(VRAM);
curs_set(1);
endwin();
}
void DisplayInput(byte n)
{
if (n == BS) {
return;
}
// Clear @
mvwaddch(AppleWindow, TermY, TermX, ' ');
if (n == CR) {
// Add spacing characters into VRAM
do {
*VRAM_Position = ' ';
VRAM_Position++;
} while (((int)(VRAM_Position - VRAM) % 40) > 0);
// Set display to next line
TermX = 0;
TermY++;
}
else {
// Place character
mvwaddch(AppleWindow, TermY, TermX, n & 0x7F);
// Add character to VRAM
*VRAM_Position = n & 0x7f;
VRAM_Position++;
// Set display to next character/next line
TermX++;
if (TermX >= 40) {
TermX = 0;
TermY++;
}
}
// Reset VRAM_Position if it's value is too great.
if (VRAM_Position >= (VRAM + 960))
VRAM_Position -= 960;
// If Y is past height..
if (TermY >= 24) {
//.. discard the first line..
VRAM_Offset += 40;
//.. verify the register offset..
if (VRAM_Offset >= 960)
VRAM_Offset = VRAM;
//.. and create an offset variable to cycle through memory with.
byte *offset = VRAM + VRAM_Offset;
// Then, for every cell of the screen, fill with the contents of the video memory.
for (int i = 0; i < 23; i++) {
for (int j = 0; j < 40; j++) {
if (offset >= (VRAM + 960))
offset -= 960;
mvwaddch(AppleWindow, i, j, *offset );
offset++;
}}
// Set to start of final line, and clear line.
TermY = 23;
TermX = 0;
mvwprintw(AppleWindow, TermY, TermX,
" ");
}
// Place @
mvwaddch(AppleWindow, TermY, TermX, '@' | A_BLINK);
wrefresh(AppleWindow);
}
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