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//
// Copyright(C) 2005-2014 Simon Howard
//
// 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.
//
//
// Base interface that abstracts the text mode screen.
//
#ifndef TXT_MAIN_H
#define TXT_MAIN_H
// For the moment, txt_sdl.c is the only implementation of the base
// text mode screen API:
#include "txt_sdl.h"
// textscreen key values:
// Key values are difficult because we have to support multiple conflicting
// address spaces.
// First, Doom's key constants use 0-127 as ASCII and extra values from
// 128-255 to represent special keys. Second, mouse buttons are represented
// as buttons. Finally, we want to be able to support Unicode.
//
// So we define different ranges:
// 0-255: Doom key constants, including ASCII.
// 256-511: Mouse buttons and other reserved.
// >=512: Unicode values greater than 127 are offset up into this range.
// Special keypress values that correspond to mouse button clicks
#define TXT_MOUSE_BASE 256
#define TXT_MOUSE_LEFT (TXT_MOUSE_BASE + 0)
#define TXT_MOUSE_RIGHT (TXT_MOUSE_BASE + 1)
#define TXT_MOUSE_MIDDLE (TXT_MOUSE_BASE + 2)
#define TXT_MOUSE_SCROLLUP (TXT_MOUSE_BASE + 3)
#define TXT_MOUSE_SCROLLDOWN (TXT_MOUSE_BASE + 4)
#define TXT_MAX_MOUSE_BUTTONS 16
#define TXT_KEY_TO_MOUSE_BUTTON(x) \
( (x) >= TXT_MOUSE_BASE \
&& (x) < TXT_MOUSE_BASE + TXT_MAX_MOUSE_BUTTONS ? \
(x) - TXT_MOUSE_BASE : -1 )
// Unicode offset. Unicode values from 128 onwards are offset up into
// this range, so TXT_UNICODE_BASE = Unicode character #128, and so on.
#define TXT_UNICODE_BASE 512
// Convert a key value to a Unicode character:
#define TXT_KEY_TO_UNICODE(x) \
( (x) < 128 ? (x) : \
(x) >= TXT_UNICODE_BASE ? ((x) - TXT_UNICODE_BASE + 128) : 0 )
// Screen size
#define TXT_SCREEN_W 80
#define TXT_SCREEN_H 25
#define TXT_COLOR_BLINKING (1 << 3)
typedef enum
{
TXT_COLOR_BLACK,
TXT_COLOR_BLUE,
TXT_COLOR_GREEN,
TXT_COLOR_CYAN,
TXT_COLOR_RED,
TXT_COLOR_MAGENTA,
TXT_COLOR_BROWN,
TXT_COLOR_GREY,
TXT_COLOR_DARK_GREY,
TXT_COLOR_BRIGHT_BLUE,
TXT_COLOR_BRIGHT_GREEN,
TXT_COLOR_BRIGHT_CYAN,
TXT_COLOR_BRIGHT_RED,
TXT_COLOR_BRIGHT_MAGENTA,
TXT_COLOR_YELLOW,
TXT_COLOR_BRIGHT_WHITE,
} txt_color_t;
// Modifier keys.
typedef enum
{
TXT_MOD_SHIFT,
TXT_MOD_CTRL,
TXT_MOD_ALT,
TXT_NUM_MODIFIERS
} txt_modifier_t;
// Initialize the screen
// Returns 1 if successful, 0 if failed.
int TXT_Init(void);
// Shut down text mode emulation
void TXT_Shutdown(void);
// Get a pointer to the buffer containing the raw screen data.
unsigned char *TXT_GetScreenData(void);
// Update an area of the screen
void TXT_UpdateScreenArea(int x, int y, int w, int h);
// Update the whole screen
void TXT_UpdateScreen(void);
// Read a character from the keyboard
int TXT_GetChar(void);
// Read the current state of modifier keys that are held down.
int TXT_GetModifierState(txt_modifier_t mod);
// Provides a short description of a key code, placing into the
// provided buffer.
void TXT_GetKeyDescription(int key, char *buf, size_t buf_len);
// Retrieve the current position of the mouse
void TXT_GetMousePosition(int *x, int *y);
// Sleep until an event is received or the screen needs updating
// Optional timeout in ms (timeout == 0 : sleep forever)
void TXT_Sleep(int timeout);
// Controls whether keys are returned from TXT_GetChar based on keyboard
// mapping, or raw key code.
void TXT_EnableKeyMapping(int enable);
// Set the window title of the window containing the text mode screen
void TXT_SetWindowTitle(char *title);
// Safe string copy.
void TXT_StringCopy(char *dest, const char *src, size_t dest_len);
// Safe string concatenate.
void TXT_StringConcat(char *dest, const char *src, size_t dest_len);
// Safe version of vsnprintf().
int TXT_vsnprintf(char *buf, size_t buf_len, const char *s, va_list args);
// Safe version of snprintf().
int TXT_snprintf(char *buf, size_t buf_len, const char *s, ...);
#endif /* #ifndef TXT_MAIN_H */
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