Created a test pattern in the client's screen.

src/vscreen.c

@@ -2,13 +2,35 @@
 #include <SDL2/SDL_image.h>
 #include <SDL2/SDL_render.h>
 #include <SDL2/SDL_surface.h>
+#include <stdio.h>
 
 void renderClientScreen(SDL_Renderer* renderer) {
     SDL_Rect dest;
 
     SDL_RenderGetViewport(renderer, &dest);
 
-    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
+    SDL_Rect cell;
+    cell.w = dest.w / VSCREEN_COLUMN_COUNT;
+    cell.h = dest.h / VSCREEN_ROW_COUNT;
+    
+    int row = 0;
+    unsigned char backgroundColor = 0x00;
 
-    SDL_RenderFillRect(renderer, &dest);
+    for (int i = 0; i < VSCREEN_ROW_COUNT; i++) {
+
+        for(int j = 0; j <VSCREEN_COLUMN_COUNT; j++) {
+            SDL_SetRenderDrawColor(renderer, backgroundColor, backgroundColor, backgroundColor, 255);
+
+            cell.x = j * cell.w;
+            cell.y = i * cell.h;
+
+            SDL_RenderFillRect(renderer, &cell);
+
+            backgroundColor ^= 0xFF;
+        }
+
+        backgroundColor ^= 0xFF;
+
+        row++;
+    }
 }