Added 'SDL_RENDERER_ACCELERATED' and 'SDL_RENDERER_PRESENTVSYNC' on SDL_CreateRenderer()

README_OS4.md

@@ -40,6 +40,13 @@ https://git.walkero.gr/walkero/lite-xl/issues
 ## Added
 - Added config.scroll_past_end that when its true lets the user scroll
   further than the end of the file. By default is set to false.
+- Added "SDL_RENDERER_ACCELERATED" and "SDL_RENDERER_PRESENTVSYNC" on 
+  SDL_CreateRenderer() since this reduces the CPU usage when the user
+  scrolls and seems to work pretty good on my systems (X5000, A1222 and 
+  microAmigaOne). This is exeprimental. If this brings problems on your
+  system, you can disable them using SDL ENV variable, like below:
+  setenv SDL_RENDER_VSYNC 0
+  setenv SDL_RENDER_DRIVER "software"
 
 ## [1.16.12.6] - 2022-01-04
 ### Fixed

src/renwindow.c

@@ -29,7 +29,7 @@ static void setup_renderer(RenWindow *ren, int w, int h) {
     SDL_DestroyTexture(ren->texture);
     SDL_DestroyRenderer(ren->renderer);
   }
-  ren->renderer = SDL_CreateRenderer(ren->window, -1, 0);
+  ren->renderer = SDL_CreateRenderer(ren->window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
   ren->texture = SDL_CreateTexture(ren->renderer, SDL_PIXELFORMAT_BGRA32, SDL_TEXTUREACCESS_STREAMING, w, h);
   ren->surface_scale = query_surface_scale(ren);
 }