/* Copyright (C) 2002 W.P. van Paassen - peter@paassen.tmfweb.nl 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; see the file COPYING. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /*note that the code has not been fully optimized*/ #include #include #include #include #include "tdec.h" #define CHARACTER_WIDTH 16 #define CHARACTER_HEIGHT 32 #define SCREEN_WIDTH 480 #define SCREEN_HEIGHT 360 static SDL_Surface* font_surface; static SDL_Surface* scroll_surface; static SDL_Surface* copy_surface; static SDL_Surface* flipped_surface; static short aSin[720]; static short aSin3[720]; static short aSin2[SCREEN_HEIGHT + CHARACTER_HEIGHT]; static Uint16 sin_index = 0; static char text[] = " The Demo Effects Collection - cheers - WP van Paassen - starting over again in - 9 8 7 6 5 4 3 2 1 "; static char characters[] = " !#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"; static char* text_pointer = text; void quit( int code ) { /* * Quit SDL so we can release the fullscreen * mode and restore the previous video settings, * etc. */ SDL_FreeSurface(scroll_surface); SDL_FreeSurface(font_surface); SDL_FreeSurface(copy_surface); SDL_FreeSurface(flipped_surface); SDL_Quit( ); TDEC_print_fps(); /* Exit program. */ exit( code ); } void handle_key_down( SDL_keysym* keysym ) { switch( keysym->sym ) { case SDLK_ESCAPE: quit( 0 ); break; default: break; } } void process_events( void ) { /* Our SDL event placeholder. */ SDL_Event event; /* Grab all the events off the queue. */ while( SDL_PollEvent( &event ) ) { switch( event.type ) { case SDL_KEYDOWN: /* Handle key presses. */ handle_key_down( &event.key.keysym ); break; case SDL_QUIT: /* Handle quit requests*/ quit( 0 ); break; } } } /* determine the print character */ Uint16 compute_font_pos(char scroll_char) { char* p = characters; Uint16 pos = 0; if (scroll_char == '\0') { text_pointer = text; scroll_char = *text_pointer++; } while (*p++ != scroll_char) { pos += CHARACTER_WIDTH; } if (pos > 0) return pos - 1; return 0; } void print_character(void) { static SDL_Rect frect = {0, 0, CHARACTER_WIDTH - 1, CHARACTER_HEIGHT}; static SDL_Rect srect = {0, SCREEN_HEIGHT + CHARACTER_HEIGHT, CHARACTER_WIDTH - 1, CHARACTER_HEIGHT}; /* determine font character according to position in scroll text */ frect.x = compute_font_pos(*text_pointer++); /*copy character to scroll_screen */ SDL_BlitSurface(font_surface, &frect, scroll_surface, &srect); } void init() { SDL_Surface* s; float rad; Uint16 i; short centerx = SCREEN_WIDTH >> 1; /*create sin lookup table */ for (i = 0; i < 720; i++) { rad = (float)i * 0.0174532 * 0.5; aSin[i] = centerx + (short)((sin(rad) * 100.0)); aSin3[i] = centerx + (short)((-sin(rad) * 100.0)); } for (i = 0; i < SCREEN_HEIGHT + CHARACTER_HEIGHT; i++) { rad = (float)i * 0.0174532 * (360.0 / (SCREEN_HEIGHT + CHARACTER_HEIGHT)) ; /* spread 360 degrees over SCREEN_HEIGHT + CHARACTER_HEIGHT values */ aSin2[i] = (short)((sin(rad) * 70.0)); if (aSin2[i] >= 0) aSin2[i] += 40; else aSin2[i] -= 40; } /* create scroll surface, this surface must be heigher than the screenwidth to print the characters 'below' the screen */ s = SDL_CreateRGBSurface(SDL_SWSURFACE, CHARACTER_WIDTH, SCREEN_HEIGHT + CHARACTER_HEIGHT * 2, 8, r_mask, g_mask, b_mask, a_mask); scroll_surface = SDL_DisplayFormat(s); SDL_FreeSurface(s); /* create copy surface */ copy_surface = TDEC_copy_surface(scroll_surface); /* create flipped surface */ flipped_surface = TDEC_copy_surface(copy_surface); /* load font */ font_surface = IMG_Load("/GFX/font.pcx"); /*disable events */ for (i = 0; i < SDL_NUMEVENTS; ++i) { if (i != SDL_KEYDOWN && i != SDL_QUIT) { SDL_EventState(i, SDL_IGNORE); } } SDL_ShowCursor(SDL_DISABLE); } int main( int argc, char* argv[] ) { Uint32 i, displacement = 0, j = 0; SDL_Rect srect2 = {0, 0, CHARACTER_WIDTH, 1}; SDL_Rect drect = {0, 0, CHARACTER_WIDTH, 1}; SDL_Rect srect = {0, 2, CHARACTER_WIDTH, SCREEN_HEIGHT + CHARACTER_HEIGHT * 2}; SDL_Rect frect = {SCREEN_WIDTH / 2 - 100 - CHARACTER_WIDTH, 0, 2 * (100 + CHARACTER_WIDTH), SCREEN_HEIGHT}; if (argc > 1) { printf("Retro Twin Sine Scroller - W.P. van Paassen - 2002\n"); return -1; } if (!TDEC_set_video(SCREEN_WIDTH, SCREEN_HEIGHT, 8, SDL_SWSURFACE | SDL_HWPALETTE /*| SDL_FULLSCREEN*/)) quit(1); TDEC_init_timer(); SDL_WM_SetCaption("Retro - Twin Sine Scroller - ", ""); init(); TDEC_set_fps(50); SDL_SetColorKey(copy_surface, SDL_SRCCOLORKEY, SDL_MapRGB(screen->format, 0x00, 0x00, 0x00)); /* time based demo loop */ while( 1 ) { TDEC_new_time(); process_events(); SDL_BlitSurface(scroll_surface, &srect, scroll_surface, 0); displacement += 2; /* print character? */ if (displacement > 30) { print_character(); displacement = 0; } SDL_FillRect(copy_surface, 0, 0); /* fill flipped surface */ SDL_BlitSurface(scroll_surface, 0, flipped_surface, 0); TDEC_flipy_image(flipped_surface); for (i = 0; i < scroll_surface->h; ++i) { if (aSin2[sin_index] > 0) TDEC_scale_copy_hscanline(scroll_surface, copy_surface, i, aSin2[sin_index]); else TDEC_scale_copy_hscanline(flipped_surface, copy_surface, i, -aSin2[sin_index]); sin_index++; sin_index %= SCREEN_HEIGHT + CHARACTER_HEIGHT; } /* clean sinus area */ SDL_FillRect(screen, &frect, 0); /* create sinus in scroll */ for (i = 0; i < SCREEN_HEIGHT; ++i) { /* draw scroller 1 */ srect2.y = CHARACTER_HEIGHT + i; drect.y = i; drect.x = aSin[(j + i) % 720]; SDL_BlitSurface(copy_surface, &srect2, screen, &drect); /* draw scroller 2 */ drect.x = aSin3[(j + i) % 720]; SDL_BlitSurface(copy_surface, &srect2, screen, &drect); } j += 6; j %= 720; if (TDEC_fps_ok()) SDL_Flip(screen); } return 0; /* never reached */ }