/* 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. */ /* 080802 done some optimization WP */ /*note that the code has not been optimized*/ #include #include #include #include #include "tdec.h" #define SCREEN_WIDTH 340 #define SCREEN_HEIGHT 360 static Uint16 sin_index = 0; static Uint8 quiting = 0; static Uint8 fadein = 1; static SDL_Surface *image = NULL; typedef struct { short sine_table[512]; Uint8 index_add; Uint8 effect; } SINE_EFFECT; #define MAX_EFFECTS 12 struct { SINE_EFFECT sine_effects[MAX_EFFECTS]; Uint8 current_effect; } EFFECTS; void quit( int code ) { /* * Quit SDL so we can release the fullscreen * mode and restore the previous video settings, * etc. */ if (image) SDL_FreeSurface(image); SDL_Quit( ); TDEC_print_fps(); /* Exit program. */ exit( code ); } void handle_key_down( SDL_keysym* keysym ) { switch( keysym->sym ) { case SDLK_ESCAPE: quiting = 1; 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 */ quiting = 1; break; } } } void init() { Uint16 i; float rad; image = IMG_Load("/GFX/tuxblackbg.png"); if (!image) { fprintf(stderr, "Cannot open file tuxblackbg.png: %s\n", SDL_GetError()); quit(3); } TDEC_blacken_palette(screen); EFFECTS.current_effect = 0; /*create sin lookup tables in effect chain */ for (i = 0; i < 512; ++i) { rad = (float)i * 0.0174532 * 0.703125; EFFECTS.sine_effects[0].sine_table[i] = (short)((sin(rad) * 8.0)); EFFECTS.sine_effects[1].sine_table[i] = (short)((sin(rad) * 16.0)); EFFECTS.sine_effects[2].sine_table[i] = (short)((sin(rad) * 20.0)); EFFECTS.sine_effects[3].sine_table[i] = (short)((sin(rad) * 32.0)); EFFECTS.sine_effects[4].sine_table[i] = (short)((sin(rad) * 64.0)); EFFECTS.sine_effects[5].sine_table[i] = (short)((sin(rad) * 128.0)); EFFECTS.sine_effects[6].sine_table[i] = (short)((sin(rad) * 256.0)); EFFECTS.sine_effects[7].sine_table[i] = (short)((sin(rad) * 128.0)); EFFECTS.sine_effects[8].sine_table[i] = (short)((sin(rad) * 64.0)); EFFECTS.sine_effects[9].sine_table[i] = (short)((sin(rad) * 44.0)); EFFECTS.sine_effects[10].sine_table[i] = (short)((sin(rad) * 32.0)); EFFECTS.sine_effects[11].sine_table[i] = (short)((sin(rad) * 8.0)); } EFFECTS.sine_effects[0].index_add = 2; EFFECTS.sine_effects[0].effect = 0; EFFECTS.sine_effects[1].index_add = 4; EFFECTS.sine_effects[1].effect = 0; EFFECTS.sine_effects[2].index_add = 3; EFFECTS.sine_effects[2].effect = 1; EFFECTS.sine_effects[3].index_add = 5; EFFECTS.sine_effects[3].effect = 0; EFFECTS.sine_effects[4].index_add = 2; EFFECTS.sine_effects[4].effect = 0; EFFECTS.sine_effects[5].index_add = 2; EFFECTS.sine_effects[5].effect = 1; EFFECTS.sine_effects[6].index_add = 4; EFFECTS.sine_effects[6].effect = 0; EFFECTS.sine_effects[7].index_add = 1; EFFECTS.sine_effects[7].effect = 0; EFFECTS.sine_effects[8].index_add = 2; EFFECTS.sine_effects[8].effect = 1; EFFECTS.sine_effects[9].index_add = 8; EFFECTS.sine_effects[9].effect = 0; EFFECTS.sine_effects[10].index_add = 3; EFFECTS.sine_effects[10].effect = 1; EFFECTS.sine_effects[11].index_add = 2; EFFECTS.sine_effects[11].effect = 1; /*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); } void sinewave( void ) { Uint16 i, sin_backup = sin_index; static SINE_EFFECT* e = EFFECTS.sine_effects; SDL_Rect d = {0, 0, SCREEN_WIDTH, 1}; SDL_Rect r; r.x = e->sine_table[sin_backup]; r.y = 0; r.w = SCREEN_WIDTH; r.h = 1; if (e->effect) { for (i = 0; i < image->h; ++i) { SDL_BlitSurface(image, &r, screen, &d); r.y = i; d.y = i; d.x = 0; sin_backup += e->index_add; sin_backup &= 511; if (i % 2) r.x = e->sine_table[sin_backup]; else r.x = -e->sine_table[sin_backup]; } } else { for (i = 0; i < image->h; ++i) { SDL_BlitSurface(image, &r, screen, &d); r.y = i; d.y = i; d.x = 0; sin_backup += e->index_add; sin_backup &= 511; r.x = e->sine_table[sin_backup]; } } sin_index += 6; if (sin_index > 1023) { sin_index = 0; EFFECTS.current_effect++; EFFECTS.current_effect %= MAX_EFFECTS; e = EFFECTS.sine_effects + EFFECTS.current_effect; } } int main( int argc, char* argv[] ) { if (argc > 1) { printf("Retro Sinewave - W.P. van Paassen - 2002\n"); return -1; } if (!TDEC_set_video(SCREEN_WIDTH, SCREEN_HEIGHT, 8, SDL_DOUBLEBUF | SDL_SWSURFACE | SDL_HWPALETTE /*| SDL_FULLSCREEN*/)) quit(1); TDEC_init_timer(); SDL_WM_SetCaption("Retro Sinewave effect ", ""); init(); /* time based demo loop */ while( 1 ) { TDEC_new_time(); process_events(); SDL_FillRect(screen, 0, 0); sinewave(); if (TDEC_fps_ok()) { SDL_Flip(screen); } if (fadein && !quiting) fadein = !TDEC_fadein(screen, image->format->palette, 6); if (quiting) { if (TDEC_fadeout(screen, 4)) quit(0); } } return 0; /* never reached */ }