add RageTextureID::TEX_PERMANENT

stepmania/src/RageTextureID.h

@@ -53,7 +53,7 @@ struct RageTextureID
 	 * Note that this property is not considered for ordering/equality.  Loading
 	 * a texture with a different loading policy will reuse the same texture with
 	 * a different policy. */
-	enum TexPolicy { TEX_CACHED, TEX_VOLATILE, TEX_DEFAULT } Policy;
+	enum TexPolicy { TEX_PERMANENT, TEX_CACHED, TEX_VOLATILE, TEX_DEFAULT } Policy;
 
 	void Init();
 

stepmania/src/RageTextureManager.cpp

@@ -21,8 +21,11 @@
  *			 player could actually view all banners long enough to transition to them
  *			 all in the course of one song select screen.
  *
- * Policy priority is in the order CACHED, VOLATILE, DEFAULT.  Textures that are
+ * Permanent: Never delete the texture.
- * loaded DEFAULT can be changed to VOLATILE and CACHED; VOLATILE textures can only
+ * 			This is only used for BannerCache=2 mode.
+ *
+ * Policy priority is in the order PERMANENT, CACHED, VOLATILE, DEFAULT.  Textures that
+ * are loaded DEFAULT can be changed to VOLATILE and CACHED; VOLATILE textures can only
  * be changed to CACHED.  CACHED flags are normally set explicitly on a per-texture
  * basis.  VOLATILE flags are set for all banners, but banners which are explicitly
  * set to CACHED should stay CACHED.  Finally, all textures, when they're finally used,
@@ -153,6 +156,13 @@ void RageTextureManager::VolatileTexture( RageTextureID ID )
 	UnloadTexture( pTexture );
 }
 
+void RageTextureManager::PermanentTexture( RageTextureID ID )
+{
+	RageTexture* pTexture = LoadTextureInternal( ID );
+	pTexture->GetPolicy() = min( pTexture->GetPolicy(), RageTextureID::TEX_PERMANENT );
+	UnloadTexture( pTexture );
+}
+
 void RageTextureManager::UnloadTexture( RageTexture *t )
 {
 	t->m_iRefCount--;
@@ -161,6 +171,8 @@ void RageTextureManager::UnloadTexture( RageTexture *t )
 	if( t->m_iRefCount )
 		return; /* Can't unload textures that are still referenced. */
 
+	if( t->GetPolicy() == RageTextureID::TEX_PERMANENT )
+		return; /* Never unload TEX_PERMANENT textures. */
 	bool bDeleteThis = false;
 
 	/* Always unload movies, so we don't waste time decoding.
@@ -219,6 +231,8 @@ void RageTextureManager::GarbageCollect( GCType type )
 
 		if( t->m_iRefCount )
 			continue; /* Can't unload textures that are still referenced. */
+		if( t->GetPolicy() == RageTextureID::TEX_PERMANENT )
+			return; /* Never unload TEX_PERMANENT textures. */
 
 		bool bDeleteThis = false;
 		if( type==screen_changed )

stepmania/src/RageTextureManager.h

@@ -57,6 +57,7 @@ public:
 	void RegisterTexture( RageTextureID ID, RageTexture *p );
 	void CacheTexture( RageTextureID ID );
 	void VolatileTexture( RageTextureID ID );
+	void PermanentTexture( RageTextureID ID );
 	void UnloadTexture( RageTexture *t );
 	void ReloadAll();