--- a/tools/64vw.c	Mon Nov 27 10:09:10 2023 +0200
+++ b/tools/64vw.c	Mon Nov 27 10:33:47 2023 +0200
@@ -273,7 +273,7 @@
     SDL_Texture *texture = NULL;
     SDL_Surface *surf = NULL;
     DMImage *bimage = NULL;
-    bool initSDL = false, exitFlag, needRedraw, allowResize;
+    bool flagInitSDL = false, flagQuit, flagRedraw, flagResize;
     size_t currIndex, prevIndex;
     int currWindowWidth, currWindowHeight;
     int res = DMERR_OK;
@@ -423,7 +423,7 @@
         dmErrorMsg("Could not initialize SDL: %s\n", SDL_GetError());
         goto out;
     }
-    initSDL = true;
+    flagInitSDL = true;
 
     // Open window
     if ((window = SDL_CreateWindow(dmProgName,
@@ -450,10 +450,10 @@
     currWindowHeight = optSetWindowHeight;
     currIndex = 0;
     prevIndex = 1;
-    needRedraw = true;
-    allowResize = true;
-    exitFlag = false;
-    while (!exitFlag)
+    flagRedraw = true;
+    flagResize = true;
+    flagQuit = false;
+    while (!flagQuit)
     {
         SDL_Event event;
         while (SDL_PollEvent(&event))
@@ -464,7 +464,7 @@
                 {
                     case SDLK_ESCAPE:
                     case SDLK_q:
-                        exitFlag = true;
+                        flagQuit = true;
                         break;
 
                     case SDLK_UP:
@@ -509,7 +509,7 @@
                     case SDLK_f:
                         // If we switch to/from fullscreen, set a flag so we do not
                         // use the fullscreen window size as new stored window size
-                        allowResize = false;
+                        flagResize = false;
                         optWindowFlags ^= SDL_WINDOW_FULLSCREEN_DESKTOP;
 
                         if (SDL_SetWindowFullscreen(window, optWindowFlags) != 0)
@@ -523,26 +523,26 @@
                         break;
                 }
 
-                needRedraw = true;
+                flagRedraw = true;
                 break;
 
             case SDL_WINDOWEVENT:
                 switch (event.window.event)
                 {
                     case SDL_WINDOWEVENT_EXPOSED:
-                        needRedraw = true;
+                        flagRedraw = true;
                         break;
 
                     case SDL_WINDOWEVENT_RESIZED:
-                        if (allowResize)
+                        if (flagResize)
                         {
                             optSetWindowWidth  = event.window.data1;
                             optSetWindowHeight = event.window.data2;
                         }
                         currWindowWidth = event.window.data1;
                         currWindowHeight = event.window.data2;
-                        allowResize = true;
-                        needRedraw = true;
+                        flagResize = true;
+                        flagRedraw = true;
                         break;
                 }
                 break;
@@ -638,11 +638,11 @@
             SDL_SetWindowTitle(window, title);
             dmFree(title);
 
-            needRedraw = true;
+            flagRedraw = true;
             prevIndex = currIndex;
         }
 
-        if (needRedraw)
+        if (flagRedraw)
         {
             // Calculate the render size
             SDL_Rect dstRect;
@@ -654,7 +654,7 @@
             SDL_RenderClear(renderer);
             SDL_RenderCopy(renderer, texture, NULL, &dstRect);
             SDL_RenderPresent(renderer);
-            needRedraw = false;
+            flagRedraw = false;
         }
         else
             SDL_Delay(50);
@@ -677,7 +677,7 @@
     if (surf != NULL)
         SDL_FreeSurface(surf);
 
-    if (initSDL)
+    if (flagInitSDL)
         SDL_Quit();
 
     dmImageFree(bimage);