New name. Minor corrections. Includes PONG.

vdp.cpp

@@ -26,6 +26,7 @@ static SDL_Window* sdlWindow = NULL;
 static SDL_Renderer* sdlRenderer = NULL;
 static SDL_Texture* sdlTexture = NULL;
 static SDL_Rect src, dst;
+static bool fullscreen = false;
 static const Uint8* keys = nullptr;
 static Uint8 just_pressed = SDL_SCANCODE_UNKNOWN;
 
@@ -148,6 +149,11 @@ void vdp_flip() {
 	SDL_RenderPresent(sdlRenderer);
 }
 
+void vdp_switch_fullscreen() {
+	SDL_SetWindowFullscreen(sdlWindow, fullscreen ? 0 : SDL_WINDOW_FULLSCREEN_DESKTOP);
+	fullscreen = !fullscreen;
+}
+
 void vdp_data_out(const unsigned char& value) {
 	data_stack[data_stack_pos++] = value;
 }