Clear screen on game start

src/main.cpp

@@ -55,6 +55,14 @@ void PSXSplash::prepare() {
     // Initialize the Renderer singleton
     psxsplash::Renderer::Init(gpu());
 
+    // Clear screen
+    psyqo::Prim::FastFill ff(psyqo::Color{.r = 0, .g = 0, .b = 0});
+    ff.rect = psyqo::Rect{0, 0, 320, 240};
+    gpu().sendPrimitive(ff);
+    ff.rect = psyqo::Rect{0, 256, 320, 240};
+    gpu().sendPrimitive(ff);
+    gpu().pumpCallbacks();
+
     // Let the active file-loader backend do any early setup.
     // CDRom: CDRomDevice::prepare() must happen here.
     psxsplash::FileLoader::Get().prepare();