Copiado el tutorial 5 de Jailgames Vintage en YouTube, pero algo sigue fallando

paleta.cpp

@@ -1,22 +1,8 @@
-#include <SDL2/SDL.h>
-
-struct ARGB
-{
-    Uint8 b, g, r, a;
-};
+#include "jUnit.h"
 
 int main(int argc, char *argv[])
 {
-    SDL_Init(SDL_INIT_EVERYTHING);
-
-    SDL_Window *w = SDL_CreateWindow("pixels", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, SDL_WINDOW_SHOWN);
-    SDL_Renderer *r = SDL_CreateRenderer(w, -1, 0);
-    SDL_RenderSetLogicalSize(r, 320, 240);
-    SDL_Texture *t = SDL_CreateTexture(r, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 320, 240);
-
-    ARGB *pixels;
-    int pitch;
-
+    init();
     SDL_Event sdlEvent;
     bool exit = false;
     while (!exit)
@@ -28,22 +14,8 @@ int main(int argc, char *argv[])
                 exit = true;
                 break;
             }
+            update();
+            jFlip();
         }
-
-        SDL_LockTexture(t, nullptr, (void **)&pixels, &pitch);
-
-        for (int i = 0; i < 76800; ++i)
-        {
-            pixels[i].b = rand() % 256;
-            pixels[i].g = rand() % 256;
-            pixels[i].r = rand() % 256;
-            pixels[i].a = 255;
-        }
-
-        SDL_UnlockTexture(t);
-
-        SDL_RenderCopy(r, t, nullptr, nullptr);
-
-        SDL_RenderPresent(r);
     }
 }