/*
 * demoscene-eo, an ASCII art demoscene written as a gift for Emmanuel Otton retirement 
 * Copyright (C) 2019  XXXXXX XXXXXXX <xxxxxx@xxxxxx.fr>
 *  
 * This file is part of demoscene-eo.
 *
 *  demoscene-eo 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  demoscene-eo 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 demoscene-eo.  If not, see <http://www.gnu.org/licenses/>
 */
#include "scene00.h"

int scene00_init(graphical_env_t *ge, scene00_env_t *se) {
	SDL_Surface *bmpSurf = SDL_LoadBMP("./res/eo1.bmp");
	se->eo1 = SDL_CreateTextureFromSurface(ge->sdl_rndr, bmpSurf);
	SDL_FreeSurface(bmpSurf);

	return 0;
}

void scene00_free(graphical_env_t *ge, scene00_env_t *se) {
	SDL_DestroyTexture(se->eo1); se->eo1=NULL;
}

int scene00_next(graphical_env_t *ge, scene00_env_t *se) {
	// Shorthands
	caca_canvas_t *cv = ge->cv;
	int w = ge->w, h = ge->h;
	Uint32 frame = ge->sc_framecount;
	SDL_Renderer *r = ge->sdl_rndr;
	// Local vars
	int res;

	// https://gist.github.com/Twinklebear/8265888
	// https://forums.libsdl.org/viewtopic.php?p=51634

	// Render all the stuff on target texture
	SDL_SetRenderTarget(r, ge->sdl_target);
	SDL_RenderCopy(r, se->eo1, NULL, NULL);
	// [...]

	// Copy the SDL screen to SDL debug window (and display it, not mandatory)
	SDL_SetRenderTarget(r, NULL);
	SDL_RenderCopy(r, ge->sdl_target, NULL, NULL);
	SDL_RenderPresent(r);
	
	// Download the rendered texture from videocard to main memory
	res = SDL_RenderReadPixels(r, NULL, 0, ge->raw_target, 256*4);

	// "convert" the raw pixel stream to ASCII art on caca canevas
	if ( res == 0 ) caca_dither_bitmap(cv, 0, 0, w, h, ge->d, ge->raw_target);

	// Add things on top of caca canvas
	caca_set_color_ansi(cv, CACA_BLACK, CACA_WHITE);
	caca_put_str(cv, (w-17)/2, h/2, "This is a message");
	caca_draw_line(cv,6,6,w-14,11, '*');
	caca_draw_thin_line(cv,frame%10,frame%10,w-10+frame%10,h-10+frame%10);

	if ( frame >= 100 ) {
		return 1;
	}
	return 0;
}