//Source: https://bitbucket.org/dandago/gigilabs/src/master/Sdl2PixelDrawing/Sdl2PixelDrawing/main.cpp
#include <unistd.h>
#include <iostream>
#include <SDL2/SDL.h>
//Define window height, width
#define height 1280
#define width 760
int main(){
bool leftMouseButtonDown = false;
bool quit = false;
SDL_Event event;
SDL_Init(SDL_INIT_VIDEO);
SDL_Window * window = SDL_CreateWindow("SDL2 Pixel Drawing", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, height, width, SDL_WINDOW_FULLSCREEN);
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
//SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, 0);
SDL_Texture * texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, height, width);
Uint32 * pixels = new Uint32[height * width];
Uint32 colour = 0xFF0000;

memset(pixels, 255, height * width * sizeof(Uint32)); //int is bg color

while (!quit){
SDL_UpdateTexture(texture, NULL, pixels, height * sizeof(Uint32));
SDL_WaitEvent(&event);

switch (event.type){
case SDL_QUIT:
quit = true;
break;
case SDL_MOUSEBUTTONUP:
if (event.button.button == SDL_BUTTON_LEFT)
leftMouseButtonDown = true;
break;
case SDL_MOUSEBUTTONDOWN:
if(event.button.button ==SDL_BUTTON_RIGHT ){
memset(pixels, 23, height * width * sizeof(Uint32)); //int is bg color
}

if (event.button.button == SDL_BUTTON_LEFT)
leftMouseButtonDown = true;
case SDL_MOUSEMOTION:
if (leftMouseButtonDown){
int mouseX = event.motion.x;
int mouseY = event.motion.y;
colour+=mouseY*8+mouseX*8; //makes a nice scaling effect.
if(colour>=0xFFFFFF)
colour=0xFF0000;
pixels[mouseY * height+ mouseX] = colour;

}
break;
}
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
}

delete[] pixels;
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer);

SDL_DestroyWindow(window);
SDL_Quit();

return 0;
}