ref: 68e5d0979584d614868f790e2dcf4e5e186415b0
dir: /textscreen/txt_main.c/
// Emacs style mode select -*- C++ -*- //----------------------------------------------------------------------------- // // $Id: txt_main.c 183 2005-10-09 20:19:21Z fraggle $ // // Copyright(C) 1993-1996 Id Software, Inc. // Copyright(C) 2005 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. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA // 02111-1307, USA. // // $Log$ // Revision 1.3 2005/10/09 20:19:21 fraggle // Handle blinking text in ENDOOM lumps properly. // // Revision 1.2 2005/10/09 16:42:46 fraggle // Cannot do arithmetic on void pointers in standard C // // Revision 1.1 2005/10/02 03:16:03 fraggle // Text mode emulation code // // //----------------------------------------------------------------------------- // // Text mode emulation in SDL // //----------------------------------------------------------------------------- #include <SDL.h> #include <stdlib.h> #include <string.h> #include "txt_main.h" #include "txt_font.h" #define SCREEN_W 80 #define SCREEN_H 25 #define CHAR_W 8 #define CHAR_H 16 static SDL_Surface *screen; static unsigned char *screendata; static SDL_Color ega_colors[] = { {0x00, 0x00, 0x00}, // 0: Black {0x00, 0x00, 0xa8}, // 1: Blue {0x00, 0xa8, 0x00}, // 2: Green {0x00, 0xa8, 0xa8}, // 3: Cyan {0xa8, 0x00, 0x00}, // 4: Red {0xa8, 0x00, 0xa8}, // 5: Magenta {0xa8, 0x54, 0x00}, // 6: Brown {0xa8, 0xa8, 0xa8}, // 7: Grey {0x54, 0x54, 0x54}, // 8: Dark grey {0x54, 0x54, 0xfe}, // 9: Bright blue {0x54, 0xfe, 0x54}, // 10: Bright green {0x54, 0xfe, 0xfe}, // 11: Bright cyan {0xfe, 0x54, 0x54}, // 12: Bright red {0xfe, 0x54, 0xfe}, // 13: Bright magenta {0xfe, 0xfe, 0x54}, // 14: Yellow {0xfe, 0xfe, 0xfe}, // 15: Bright white }; // // Initialise text mode screen // // Returns 1 if successful, 0 if an error occurred // int TXT_Init(void) { SDL_InitSubSystem(SDL_INIT_VIDEO); screen = SDL_SetVideoMode(SCREEN_W * CHAR_W, SCREEN_H * CHAR_H, 8, 0); if (screen == NULL) return 0; SDL_SetColors(screen, ega_colors, 0, 16); screendata = malloc(SCREEN_W * SCREEN_H * 2); memset(screendata, 0, SCREEN_W * SCREEN_H * 2); return 1; } void TXT_Shutdown(void) { free(screendata); SDL_QuitSubSystem(SDL_INIT_VIDEO); } unsigned char *TXT_GetScreenData(void) { return screendata; } static inline void UpdateCharacter(int x, int y) { unsigned char character; unsigned char *p; unsigned char *s, *s1; int bg, fg; int x1, y1; p = &screendata[(y * SCREEN_W + x) * 2]; character = p[0]; fg = p[1] & 0xf; bg = (p[1] >> 4) & 0xf; if (bg & 0x8) { // blinking bg &= ~0x8; if (SDL_GetTicks() % 500 < 250) fg = bg; } p = &int10_font_16[character * CHAR_H]; s = ((unsigned char *) screen->pixels) + (y * CHAR_H * screen->pitch) + (x * CHAR_W); for (y1=0; y1<CHAR_H; ++y1) { s1 = s; for (x1=0; x1<CHAR_W; ++x1) { if (*p & (1 << (7-x1))) { *s1++ = fg; } else { *s1++ = bg; } } ++p; s += screen->pitch; } } void TXT_UpdateScreenArea(int x, int y, int w, int h) { int x1, y1; for (y1=y; y1<y+h; ++y1) { for (x1=x; x1<x+w; ++x1) { UpdateCharacter(x1, y1); } } SDL_UpdateRect(screen, x * CHAR_W, y * CHAR_H, w * CHAR_W, h * CHAR_H); } void TXT_UpdateScreen(void) { TXT_UpdateScreenArea(0, 0, SCREEN_W, SCREEN_H); }