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Shylie 2023-12-25 11:26:13 -05:00
commit 226adeaf72
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26
CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 3.18)
project(terml CXX)
add_library(terml STATIC
include/terml.h
source/terml_private.h
source/terml_windows.h
source/terml_linux.h
source/terml_windows.cpp
source/terml_linux.cpp
source/terml.cpp
)
set_target_properties(terml
PROPERTIES
CXX_STANDARD 11
)
target_include_directories(terml
PUBLIC
include
PRIVATE
source
)

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include/terml.h Normal file
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#ifndef TERML_TERML_H
#define TERML_TERML_H
#ifdef __cplusplus
extern "C"
{
#endif
typedef void (*terml_main_callback)();
typedef int (*terml_quit_callback)();
typedef void (*terml_key_callback) (char code);
int terml_init();
int terml_deinit();
unsigned int terml_get_width();
unsigned int terml_get_height();
char terml_get(unsigned int x, unsigned int y, int* foreground_color, int* background_color);
void terml_set(unsigned int x, unsigned int y, char c, int foreground_color, int background_color);
void terml_flush();
void terml_set_main_callback(terml_main_callback);
void terml_set_quit_callback(terml_quit_callback);
void terml_set_key_callback(terml_key_callback);
void terml_start();
void terml_stop();
const char* terml_get_error();
#ifdef __cplusplus
}
#endif
#endif//TERML_TERML_H

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#include "terml_private.h"
#ifdef _WIN32
#include "terml_windows.h"
#else
#include "terml_linux.h"
#endif
#include <cstdio>
#include <cstring>
terml::terml() :
main(nullptr),
quit(nullptr),
key(nullptr),
buffer(nullptr),
width(0),
height(0)
{
printf(ALT_BUF() HIDE_CURSOR());
fflush(stdout);
}
terml::~terml()
{
printf(REG_BUF() SHOW_CURSOR());
fflush(stdout);
delete[] buffer;
}
char terml::get(unsigned int x, unsigned int y, int* fg, int* bg) const
{
const unsigned int offset = x + y * width;
if (fg)
{
const unsigned char r =
(buffer[offset * CELL_SIZE + 9] - '0') +
(buffer[offset * CELL_SIZE + 8] - '0') * 10 +
(buffer[offset * CELL_SIZE + 7] - '0') * 100;
const unsigned char g =
(buffer[offset * CELL_SIZE + 13] - '0') +
(buffer[offset * CELL_SIZE + 12] - '0') * 10 +
(buffer[offset * CELL_SIZE + 11] - '0') * 100;
const unsigned char b =
(buffer[offset * CELL_SIZE + 17] - '0') +
(buffer[offset * CELL_SIZE + 16] - '0') * 10 +
(buffer[offset * CELL_SIZE + 15] - '0') * 100;
*fg = (r << 16) | (g << 8) | b;
}
if (bg)
{
const unsigned char r =
(buffer[offset * CELL_SIZE + 26] - '0') +
(buffer[offset * CELL_SIZE + 27] - '0') * 10 +
(buffer[offset * CELL_SIZE + 28] - '0') * 100;
const unsigned char g =
(buffer[offset * CELL_SIZE + 30] - '0') +
(buffer[offset * CELL_SIZE + 31] - '0') * 10 +
(buffer[offset * CELL_SIZE + 32] - '0') * 100;
const unsigned char b =
(buffer[offset * CELL_SIZE + 34] - '0') +
(buffer[offset * CELL_SIZE + 35] - '0') * 10 +
(buffer[offset * CELL_SIZE + 36] - '0') * 100;
*bg = (r << 16) | (g << 8) | b;
}
return buffer[offset * CELL_SIZE + CELL_SIZE - 1];
}
void terml::set(unsigned int x, unsigned int y, char c, int fg, int bg)
{
const unsigned int offset = x + y * width;
unsigned char fgr = (fg & 0xFF0000) >> 16;
unsigned char fgg = (fg & 0x00FF00) >> 8;
unsigned char fgb = (fg & 0x0000FF);
unsigned char bgr = (bg & 0xFF0000) >> 16;
unsigned char bgg = (bg & 0x00FF00) >> 8;
unsigned char bgb = (bg & 0x0000FF);
for (int i = 0; i < 3; i++)
{
buffer[offset * CELL_SIZE + (9 - i)] = (fgr % 10) + '0';
fgr /= 10;
buffer[offset * CELL_SIZE + (13 - i)] = (fgg % 10) + '0';
fgg /= 10;
buffer[offset * CELL_SIZE + (17 - i)] = (fgb % 10) + '0';
fgb /= 10;
buffer[offset * CELL_SIZE + (28 - i)] = (bgr % 10) + '0';
bgr /= 10;
buffer[offset * CELL_SIZE + (32 - i)] = (bgg % 10) + '0';
bgg /= 10;
buffer[offset * CELL_SIZE + (36 - i)] = (bgb % 10) + '0';
bgb /= 10;
}
buffer[offset * CELL_SIZE + CELL_SIZE - 1] = c;
}
void terml::flush() const
{
printf(CUP(1, 1));
fflush(stdout);
printf("%s", buffer);
fflush(stdout);
}
void terml::set_main_callback(terml_main_callback callback)
{
main = callback;
}
void terml::set_quit_callback(terml_quit_callback callback)
{
quit = callback;
}
void terml::set_key_callback(terml_key_callback callback)
{
key = callback;
}
void terml::key_event(char code)
{
if (key)
{
key(code);
}
}
void terml::mainloop()
{
should_quit = false;
really_should_quit = false;
const unsigned long long wait_time = timer_frequency() / 1000;
unsigned long long last_time = timer();
while (!really_should_quit)
{
unsigned long long current_time = timer();
while (current_time >= last_time + wait_time)
{
main();
process_events();
last_time += wait_time;
}
if (should_quit)
{
if (!quit || quit())
{
really_should_quit = true;
}
else
{
should_quit = false;
}
}
}
}
void terml::stop()
{
should_quit = true;
}
unsigned int terml::get_width() const
{
return width;
}
unsigned int terml::get_height() const
{
return height;
}
void terml::setup_buffer()
{
printf(CUP(999, 999) REPORT_CUSROR_POSITION());
fflush(stdout);
constexpr const unsigned int STDIN_BUFFER_SIZE = 16;
char stdin_buffer[STDIN_BUFFER_SIZE + 1];
read_stdin(stdin_buffer, STDIN_BUFFER_SIZE);
stdin_buffer[STDIN_BUFFER_SIZE] = '\0';
unsigned int new_width = width;
unsigned int new_height = height;
const int scanned = sscanf(stdin_buffer, CURSOR_POSITION_FORMAT(), &new_height, &new_width);
if (scanned != 2)
{
throw "Failed to determine screen size.";
}
if (width != new_width || height != new_height)
{
width = new_width;
height = new_height;
if (buffer) { delete[] buffer; }
buffer = new char[CELL_SIZE * width * height + 1];
constexpr char BLANK_CELL[] = FG(255, 255, 255) CSI "48;2;000;000;000m" " ";
for (int i = 0; i < width * height; i++)
{
memcpy(buffer + i * CELL_SIZE, BLANK_CELL, CELL_SIZE);
}
buffer[CELL_SIZE * width * height] = '\0';
}
}
static terml* TERML_G;
static const char* LAST_ERROR = nullptr;
extern "C"
{
int terml_init()
{
try
{
if (!TERML_G)
{
#ifdef _WIN32
TERML_G = new terml_windows;
#else
TERML_G = new terml_linux;
#endif
}
TERML_G->set_console_settings();
TERML_G->setup_buffer();
return 1;
}
catch (const char* c)
{
LAST_ERROR = c;
return 0;
}
}
int terml_deinit()
{
try
{
if (TERML_G)
{
TERML_G->reset_console_settings();
delete TERML_G;
}
return 1;
}
catch (const char* c)
{
LAST_ERROR = c;
return 0;
}
}
unsigned int terml_get_width()
{
return TERML_G->get_width();
}
unsigned int terml_get_height()
{
return TERML_G->get_height();
}
char terml_get(unsigned int x, unsigned int y, int* fg, int* bg)
{
return TERML_G->get(x, y, fg, bg);
}
void terml_set(unsigned int x, unsigned int y, char c, int fg, int bg)
{
TERML_G->set(x, y, c, fg, bg);
}
void terml_flush()
{
TERML_G->flush();
}
void terml_set_main_callback(terml_main_callback callback)
{
TERML_G->set_main_callback(callback);
}
void terml_set_quit_callback(terml_quit_callback callback)
{
TERML_G->set_quit_callback(callback);
}
void terml_set_key_callback(terml_key_callback callback)
{
TERML_G->set_key_callback(callback);
}
void terml_start()
{
try
{
TERML_G->mainloop();
}
catch (const char* c)
{
LAST_ERROR = c;
}
}
void terml_stop()
{
TERML_G->stop();
}
const char* terml_get_error()
{
const char* err = LAST_ERROR;
LAST_ERROR = nullptr;
return err;
}
}

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#include "terml_linux.h"
#ifndef _WIN32
#include <time.h>
#include <errno.h>
#include <cstdio>
#include <poll.h>
void terml_linux::set_console_settings()
{
tcgetattr(STDIN_FILENO, &old_input_settings);
tcgetattr(STDOUT_FILENO, &old_output_settings);
termios t = old_input_settings;
t.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &t);
}
void terml_linux::reset_console_settings()
{
tcsetattr(STDIN_FILENO, TCSANOW, &old_input_settings);
tcsetattr(STDOUT_FILENO, TCSANOW, &old_output_settings);
}
void terml_linux::read_stdin(char* buffer, unsigned int buffer_size)
{
for (int i = 0; i < buffer_size;)
{
char ch = getchar();
if (i == 0 && ch != '\x1B')
{
key_event(ch);
}
else
{
buffer[i++] = ch;
}
if (ch == 'R') { return; }
}
}
unsigned long long terml_linux::timer()
{
timespec spec;
clock_gettime(CLOCK_REALTIME, &spec);
return timer_frequency() * spec.tv_sec + spec.tv_nsec;
}
unsigned long long terml_linux::timer_frequency()
{
return 1000000000; // nanoseconds / second
}
void terml_linux::process_events()
{
constexpr int BUF_SIZE = 128;
char buf[BUF_SIZE];
int num_read;
pollfd pfd;
pfd.fd = STDIN_FILENO;
pfd.events = POLLIN;
pfd.revents = 0;
poll(&pfd, 1, 0);
while (pfd.revents & POLLIN)
{
num_read = read(STDIN_FILENO, buf, BUF_SIZE);
for (int i = 0; i < num_read; i++)
{
key_event(buf[i]);
}
poll(&pfd, 1, 0);
}
setup_buffer();
}
#endif

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#ifndef TERML_TERML_LINUX_H
#define TERML_TERML_LINUX_H
#include "terml_private.h"
#ifndef _WIN32
#include <termios.h>
#include <unistd.h>
class terml_linux : public terml
{
protected:
virtual void set_console_settings() override;
virtual void reset_console_settings() override;
virtual void read_stdin(char* buffer, unsigned int buffer_size) override;
virtual unsigned long long timer() override;
virtual unsigned long long timer_frequency() override;
virtual void process_events() override;
private:
termios old_input_settings;
termios old_output_settings;
};
#endif//_WIN32
#endif//TERML_TERML_LINUX_H

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#ifndef TERML_TERML_PRIVATE_H
#define TERML_TERML_PRIVATE_H
#include "terml.h"
#define STRINGIFY2(x) #x
#define STRINGIFY(x) STRINGIFY2(x)
#define ESC "\x1B"
#define CSI "\x1B["
#define ALT_BUF() CSI "?1049h"
#define REG_BUF() CSI "?1049l"
#define CLEAR_SCREEN() CSI "2J"
#define HIDE_CURSOR() CSI "?25l"
#define SHOW_CURSOR() CSI "?25h"
#define REPORT_CUSROR_POSITION() CSI "6n"
#define CURSOR_POSITION_FORMAT() "%*1s[%u;%u"
#define CUP(x, y) CSI STRINGIFY(y) ";" STRINGIFY(x) "H"
#define FG(r, g, b) CSI "38;2;" STRINGIFY(r) ";" STRINGIFY(g) ";" STRINGIFY(b) "m"
#define BG(r, g, b) CSI "48;2;" STRINGIFY(r) ";" STRINGIFY(g) ";" STRINGIFY(b) "m"
class terml
{
public:
terml();
virtual ~terml();
terml(const terml&) = delete;
terml(terml&&) = delete;
terml& operator=(const terml&) = delete;
terml& operator=(terml&&) = delete;
char get(unsigned int x, unsigned int y, int* fg, int* bg) const;
void set(unsigned int x, unsigned int y, char c, int fg, int bg);
void flush() const;
void set_main_callback(terml_main_callback);
void set_quit_callback(terml_quit_callback);
void set_key_callback(terml_key_callback);
void mainloop();
void stop();
unsigned int get_width() const;
unsigned int get_height() const;
void setup_buffer();
virtual void set_console_settings() = 0;
virtual void reset_console_settings() = 0;
protected:
virtual void read_stdin(char* buffer, unsigned int buffer_size) = 0;
virtual unsigned long long timer() = 0;
virtual unsigned long long timer_frequency() = 0;
virtual void process_events() = 0;
void key_event(char code);
private:
char* buffer;
unsigned int width;
unsigned int height;
terml_main_callback main;
terml_quit_callback quit;
terml_key_callback key;
bool should_quit;
bool really_should_quit;
static const unsigned int CELL_SIZE = sizeof(FG(255, 255, 255) BG(255, 255, 255) " ") - 1;
};
#endif//TERML_TERML_PRIVATE_H

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#include "terml_windows.h"
#ifdef _WIN32
void terml_windows::set_console_settings()
{
handle_stdin = GetStdHandle(STD_INPUT_HANDLE);
GetConsoleMode(handle_stdin, &previous_input_mode);
DWORD new_mode = previous_input_mode;
new_mode &= ~ENABLE_ECHO_INPUT;
new_mode &= ~ENABLE_LINE_INPUT;
new_mode |= ENABLE_WINDOW_INPUT;
new_mode |= ENABLE_VIRTUAL_TERMINAL_INPUT;
if (!SetConsoleMode(handle_stdin, new_mode))
{
throw "Failed to set stdin mode";
}
HANDLE handle = GetStdHandle(STD_OUTPUT_HANDLE);
GetConsoleMode(handle, &previous_output_mode);
new_mode = previous_output_mode;
new_mode |= ENABLE_PROCESSED_OUTPUT;
new_mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
if (!SetConsoleMode(handle, new_mode))
{
throw "Failed to set stdout mode";
}
}
void terml_windows::reset_console_settings()
{
if (!SetConsoleMode(handle_stdin, previous_input_mode))
{
throw "Failed to reset stdin mode";
}
if (!SetConsoleMode(GetStdHandle(STD_OUTPUT_HANDLE), previous_output_mode))
{
throw "Failed to reset stdout mode";
}
}
void terml_windows::read_stdin(char* buffer, unsigned int buffer_size)
{
unsigned long unused;
ReadConsole(handle_stdin, buffer, buffer_size, &unused, nullptr);
}
unsigned long long terml_windows::timer()
{
LARGE_INTEGER time;
QueryPerformanceCounter(&time);
return time.QuadPart;
}
unsigned long long terml_windows::timer_frequency()
{
LARGE_INTEGER frequency;
QueryPerformanceFrequency(&frequency);
return frequency.QuadPart;
}
void terml_windows::process_events()
{
DWORD num_events_available = 0;
GetNumberOfConsoleInputEvents(handle_stdin, &num_events_available);
DWORD num_events_read = 0;
INPUT_RECORD input_record_buffer[128];
while (num_events_available > 0)
{
ReadConsoleInput(handle_stdin, input_record_buffer, sizeof(input_record_buffer) / sizeof(*input_record_buffer), &num_events_read);
for (int i = 0; i < num_events_read; i++)
{
switch (input_record_buffer[i].EventType)
{
case KEY_EVENT:
{
KEY_EVENT_RECORD* record = &input_record_buffer[i].Event.KeyEvent;
if (record->bKeyDown)
{
for (int repeat = 0; repeat < record->wRepeatCount; repeat++)
{
key_event(record->uChar.AsciiChar);
}
}
break;
}
case WINDOW_BUFFER_SIZE_EVENT:
setup_buffer();
break;
}
}
num_events_available -= num_events_read;
}
}
#endif

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#ifndef TERML_TERML_WINDOWS_H
#define TERML_TERML_WINDOWS_H
#include "terml_private.h"
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
class terml_windows : public terml
{
protected:
virtual void set_console_settings() override;
virtual void reset_console_settings() override;
virtual void read_stdin(char* buffer, unsigned int buffer_size) override;
virtual unsigned long long timer() override;
virtual unsigned long long timer_frequency() override;
virtual void process_events() override;
private:
DWORD previous_input_mode;
DWORD previous_output_mode;
HANDLE handle_stdin;
};
#endif//_WIN32
#endif//TERML_TERML_WINDOWS_H