Hook up the Smart 2D texture filtering option for retroarch

libretro/libretro.cpp

@@ -842,6 +842,15 @@ static void check_variables(CoreParameter &coreParam)
          g_Config.iTexFiltering = 4;
    }
 
+   var.key = "ppsspp_smart_2d_texture_filtering";
+   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
+   {
+      if (!strcmp(var.value, "disabled"))
+         g_Config.bSmart2DTexFiltering = false;
+      else
+         g_Config.bSmart2DTexFiltering = true;
+   }
+
    var.key = "ppsspp_texture_replacement";
    if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
    {

libretro/libretro_core_options.h

@@ -584,6 +584,16 @@ struct retro_core_option_v2_definition option_defs_us[] = {
       },
       "Auto"
    },
+   {
+      "ppsspp_smart_2d_texture_filtering",
+      "Smart 2D Texture Filtering",
+      NULL,
+      "Gets rid of some visual artifacts caused by unnecessary texture filtering in some 2D games, by switching to nearest filtering.",
+      NULL,
+      "video",
+      BOOL_OPTIONS,
+      "disabled"
+   },
    {
       "ppsspp_texture_replacement",
       "Texture Replacement",