381 lines
8.6 KiB
C++
381 lines
8.6 KiB
C++
#include "gl3w.h"
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#include "Window.h"
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#include "Runtime.h"
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#include "BufferPane.h"
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#define INITIAL_WIDTH 800
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#define INITIAL_HEIGHT 800
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#define FONT_SIZE 16
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struct
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{
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SDL_TimerID timer_id;
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SDL_Keycode keysym;
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bool pressed;
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} Key_Statuses[SDL_NUM_SCANCODES];
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/**
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* Initialize SDL.
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*
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* @retval true SDL was loaded successfully.
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* @retval false Loading SDL failed.
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*/
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static bool Initialize_SDL()
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{
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static bool initialized = false;
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if (initialized)
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{
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return true;
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}
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if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) != 0)
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{
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return false;
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}
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atexit(SDL_Quit);
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initialized = true;
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return true;
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}
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/**
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* Initialize OpenGL.
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*
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* @retval true OpenGL was loaded successfully.
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* @retval false Loading OpenGL failed.
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*/
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static bool Initialize_OpenGL()
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{
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if (gl3wInit() != 0)
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{
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/* Failed to gl3wInit() */
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return false;
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}
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if (!gl3wIsSupported(3, 0))
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{
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/* OpenGL 3.0 is not supported */
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return false;
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}
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glActiveTexture(GL_TEXTURE0);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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return true;
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}
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/**
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* Create a Window.
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*
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* @retval true The Window was created successfully.
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* @retval false There was an error while creating the Window.
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*/
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bool Window::create(std::shared_ptr<Buffer> buffer)
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{
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if (!Initialize_SDL())
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{
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return false;
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}
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m_window = SDL_CreateWindow(
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APPNAME,
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SDL_WINDOWPOS_UNDEFINED,
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SDL_WINDOWPOS_UNDEFINED,
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INITIAL_WIDTH,
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INITIAL_HEIGHT,
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SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
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if (m_window == NULL)
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{
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return false;
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}
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(void)SDL_GL_CreateContext(m_window);
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if (!Initialize_OpenGL())
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{
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return false;
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}
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m_exit_requested = false;
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/* TODO: user configurable font, size */
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std::string font_path = Runtime::find(Runtime::FONT, "DejaVuSansMono");
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if (font_path == "")
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{
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return false;
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}
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m_font = std::make_shared<Font>();
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if (!m_font->load(font_path.c_str(), FONT_SIZE))
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{
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return false;
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}
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m_gl = std::make_shared<GL>();
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m_target_column = 0u; /* TODO: fix */
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glClearColor (0.0, 0.0, 0.0, 0.0);
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m_buffer_pane = std::make_shared<BufferPane>(this, buffer);
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resize();
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return true;
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}
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/**
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* Run the Window event loop.
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*
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* TODO: make this a static method to support multiple GUI windows.
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*/
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void Window::run_event_loop()
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{
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SDL_Event event;
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while ((!m_exit_requested) && SDL_WaitEvent(&event))
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{
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handle_event(event);
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if (m_redraw_requested)
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{
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m_redraw_requested = false;
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redraw();
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}
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}
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}
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Uint32 Key_Repeat(Uint32 interval, void * param)
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{
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if (Key_Statuses[(uintptr_t)param].pressed)
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{
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SDL_Event event;
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event.user.code = 0;
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event.user.data1 = (void *)(uintptr_t)Key_Statuses[(uintptr_t)param].keysym;
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event.user.data2 = nullptr;
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event.type = SDL_USEREVENT;
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SDL_PushEvent(&event);
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return 25u;
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}
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else
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{
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return 0u;
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}
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}
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/**
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* Handle a SDL event.
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*/
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void Window::handle_event(SDL_Event & event)
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{
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switch (event.type)
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{
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case SDL_QUIT:
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m_exit_requested = true;
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break;
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case SDL_KEYDOWN:
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m_keymod = event.key.keysym.mod;
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if (event.key.repeat == 0)
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{
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Key_Statuses[event.key.keysym.scancode].pressed = true;
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Key_Statuses[event.key.keysym.scancode].keysym = event.key.keysym.sym;
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Key_Statuses[event.key.keysym.scancode].timer_id = SDL_AddTimer(300, Key_Repeat, (void *)event.key.keysym.scancode);
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handle_keysym(event.key.keysym.sym);
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}
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break;
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case SDL_KEYUP:
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m_keymod = event.key.keysym.mod;
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Key_Statuses[event.key.keysym.scancode].pressed = false;
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if (Key_Statuses[event.key.keysym.scancode].timer_id != 0)
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{
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SDL_RemoveTimer(Key_Statuses[event.key.keysym.scancode].timer_id);
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Key_Statuses[event.key.keysym.scancode].timer_id = 0;
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}
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break;
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case SDL_WINDOWEVENT:
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switch (event.window.event)
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{
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case SDL_WINDOWEVENT_EXPOSED:
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redraw();
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break;
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case SDL_WINDOWEVENT_RESIZED:
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resize();
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redraw();
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break;
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}
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break;
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case SDL_USEREVENT:
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handle_keysym((uint32_t)(uintptr_t)event.user.data1);
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break;
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}
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}
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void Window::handle_keysym(uint32_t keysym)
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{
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handle_keyval(get_keyval(keysym));
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}
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void Window::handle_keyval(uint32_t keyval)
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{
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if (m_buffer_pane->insert_mode())
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{
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if (keyval == '\033')
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{
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m_buffer_pane->exit_insert_mode();
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}
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else if (keyval < 0xFFu)
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{
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m_buffer_pane->insert_code_point(keyval);
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}
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}
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else
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{
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switch (keyval)
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{
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case '0':
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m_buffer_pane->cursor_move(CursorMovement::SOL);
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break;
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case '$':
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m_buffer_pane->cursor_move(CursorMovement::EOL);
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break;
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case 'A':
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m_buffer_pane->enter_insert_mode(EnterInsertModeMode::END_OF_LINE);
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break;
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case 'G':
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m_buffer_pane->cursor_move(CursorMovement::LAST_LINE);
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break;
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case 'I':
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m_buffer_pane->enter_insert_mode(EnterInsertModeMode::START_OF_LINE);
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break;
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case 'O':
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m_buffer_pane->enter_insert_mode(EnterInsertModeMode::NEW_LINE_BEFORE);
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break;
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case 'a':
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m_buffer_pane->enter_insert_mode(EnterInsertModeMode::END_OF_CHAR);
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break;
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case 'g':
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m_buffer_pane->cursor_move(CursorMovement::FIRST_LINE);
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break;
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case 'h':
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m_buffer_pane->cursor_move(CursorMovement::LEFT);
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break;
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case 'i':
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m_buffer_pane->enter_insert_mode(EnterInsertModeMode::START_OF_CHAR);
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break;
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case 'j':
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m_buffer_pane->cursor_move(CursorMovement::DOWN);
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break;
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case 'k':
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m_buffer_pane->cursor_move(CursorMovement::UP);
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break;
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case 'l':
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m_buffer_pane->cursor_move(CursorMovement::RIGHT);
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break;
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case 'o':
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m_buffer_pane->enter_insert_mode(EnterInsertModeMode::NEW_LINE_AFTER);
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break;
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case 'x':
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m_buffer_pane->kill_character_at_cursor();
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break;
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case Keymod::CTRL + 'w':
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m_buffer_pane->write_file();
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break;
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case Keymod::CTRL + 'q':
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m_exit_requested = true;
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break;
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}
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}
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}
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void Window::resize()
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{
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SDL_GetWindowSize(m_window, &m_width, &m_height);
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glViewport(0, 0, m_width, m_height);
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m_gl->resize(m_width, m_height);
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m_buffer_pane->move(0, 0);
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m_buffer_pane->resize(m_width, m_height);
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}
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void Window::redraw()
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{
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glClear(GL_COLOR_BUFFER_BIT);
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m_buffer_pane->draw();
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SDL_GL_SwapWindow(m_window);
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}
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uint32_t Window::get_keyval(SDL_Keycode keysym)
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{
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uint32_t keyval = keysym;
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if ((m_keymod & (KMOD_SHIFT | KMOD_CAPS)) != 0u)
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{
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uint32_t shifted = get_shifted(keyval);
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if (shifted != keyval)
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{
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keyval = shifted;
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}
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else
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{
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keyval |= Keymod::SHIFT;
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}
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}
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if ((m_keymod & KMOD_CTRL) != 0u)
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{
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keyval |= Keymod::CTRL;
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}
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if ((m_keymod & KMOD_ALT) != 0u)
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{
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keyval |= Keymod::ALT;
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}
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if ((m_keymod & KMOD_GUI) != 0u)
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{
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keyval |= Keymod::GUI;
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}
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return keyval;
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}
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uint32_t Window::get_shifted(uint32_t keysym)
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{
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if ((keysym >= 'a') && (keysym <= 'z'))
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{
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return keysym - ('a' - 'A');
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}
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switch (keysym)
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{
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case SDLK_QUOTE: return '"';
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case SDLK_COMMA: return '<';
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case SDLK_MINUS: return '_';
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case SDLK_PERIOD: return '>';
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case SDLK_SLASH: return '?';
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case SDLK_0: return ')';
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case SDLK_1: return '!';
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case SDLK_2: return '@';
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case SDLK_3: return '#';
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case SDLK_4: return '$';
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case SDLK_5: return '%';
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case SDLK_6: return '^';
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case SDLK_7: return '&';
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case SDLK_8: return '*';
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case SDLK_9: return '(';
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case SDLK_SEMICOLON: return ':';
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case SDLK_EQUALS: return '+';
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case SDLK_LEFTBRACKET: return '{';
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case SDLK_BACKSLASH: return '|';
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case SDLK_RIGHTBRACKET: return '}';
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case SDLK_BACKQUOTE: return '~';
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}
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return keysym;
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}
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