/*	Copyright (C) 2021 Gentoo-libre Install

	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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include <SDL2/SDL.h>
#include <stdio.h>
#include <stdlib.h>

#include "lookup.h"//contains a 2D array mapped to the display

#define WIDTH 64
#define HEIGHT 32

int main(int argc, char *argv[])
{
        SDL_Window *window;
        SDL_Renderer *renderer;
        SDL_Texture *texture;
        SDL_Event event;

        if (SDL_Init(SDL_INIT_VIDEO) < 0)
		{
                SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
                return 3;
		}

        window = SDL_CreateWindow("SDL_CreateTexture",
                        SDL_WINDOWPOS_UNDEFINED,
                        SDL_WINDOWPOS_UNDEFINED,
                        WIDTH*16, HEIGHT*16,
                        SDL_WINDOW_RESIZABLE);

        renderer = SDL_CreateRenderer(window, -1, 0);

        texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);//create a texture for direct pixel access

	int pitch;//pixel pitch
	int *pixels = NULL;//pointer that will later point to the pixels


	while (1)
		{
		int ret = SDL_LockTexture(texture, NULL, (void **) &pixels, &pitch);//lock the texture for direct pixel access
		if (ret != 0){SDL_Log("ret=%d pix=%p error=%s", ret, pixels, SDL_GetError());}

		//display checkerboard pattern
		int i, j;
		for (i=0; i<32; ++i)
			{
			if (i % 2 == 0)
				{
				for (j=0; j<64; j+=2)
					{
					pixels[display[i][j]] = 0xFFFFFFFF; //white
					}
				}
			else
				{
				for (j=1; j<64; j+=2)
					{
					pixels[display[i][j]] = 0xFFFFFFFF; //white
					}
				}
			}

//		pixels[2047] = 0xfff0;//blue

//		pixels = pixels + pitch; //pitch doesn't need to be changed

		SDL_UnlockTexture(texture);

		SDL_RenderCopy(renderer, texture, NULL, NULL);//copy the texture to the rendered
		SDL_RenderPresent(renderer);//render the texture to the renderer

		//SDL delay seems to case a bug when pressing the x or Alt+F4 does not close for some time
		SDL_Delay(80);//An ~80ms delay between redrawing and polling for SDL_QUIT saves CPU time while still retaining quick resizing and closing
		SDL_PollEvent(&event);
		if(event.type == SDL_QUIT){break;}
		}

	SDL_DestroyRenderer(renderer);
	SDL_Quit();
        return 0;
}