Duplicat el fitxers de shaders per a resolucions verticals de 256 i 240

source/screen.cpp

@@ -200,7 +200,8 @@ void Screen::setVideoMode(ScreenVideoMode videoMode)
     if (options.video.shaders)
     {
 #ifndef NO_SHADERS
-        std::ifstream f(Asset::get()->get("crtpi.glsl").c_str());
+        const std::string glsl_file = param.game.game_area.rect.h == 256 ? "crtpi_256.glsl" : "crtpi_240.glsl";
+        std::ifstream f(Asset::get()->get(glsl_file).c_str());
         std::string source((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
 
         shader::init(window_, shader_canvas_, source.c_str());