SDL2drawPixles

#include <iostream>
#include <SDL2/SDL.h>
//Source: https://bitbucket.org/dandago/gigilabs/src/master/Sdl2PixelDrawing/Sdl2PixelDrawing/main.cpp
//Define window height, width
#define height 1280
#define width   760
int main(int argc, char ** argv){
    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, 0);
    SDL_Texture * texture = SDL_CreateTexture(renderer,  SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, height, width);
    Uint32 * pixels = new Uint32[height * width];
    SDL_SetRenderDrawColor(renderer, 255, 128, 255, 255); //has no effect


    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 = false;
                break;
            case SDL_MOUSEBUTTONDOWN:
                if (event.button.button == SDL_BUTTON_LEFT)
                    leftMouseButtonDown = true;
            case SDL_MOUSEMOTION:
                if (leftMouseButtonDown){
                    int mouseX = event.motion.x;
                    int mouseY = event.motion.y;

                    pixels[mouseY * height+ mouseX] = 0;
                }
                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;
}