Support disabling optional effects if a given other effect is _enabled_.

[nageru] / nageru / scene.h

diff --git a/nageru/scene.h b/nageru/scene.h
index 77155479adeb2f25280a0b822b67de0f2044541f..8db75540559cfa29bf45611319e19380bb56fc1c 100644 (file)
--- a/nageru/scene.h
+++ b/nageru/scene.h
@@ -88,7 +88,21 @@ struct Block {
 
        std::vector<EffectBlueprint *> alternatives;  // Must all have the same amount of inputs. Pointers to make things easier for Lua.
        std::vector<Index> inputs;  // One for each input of alternatives[0] (ie., typically 0 or 1, occasionally 2).
-       std::vector<Index> disablers;  // If any of these are disabled (IdentityEffect chosen), so should this one.
+
+       // If any of these effects are disabled (IdentityEffect chosen)
+       // or enabled (not chosen) as determined by <condition>, so should this one.
+       struct Disabler {
+               Index block_idx;
+               enum {
+                       DISABLE_IF_OTHER_DISABLED,
+
+                       // This a promise from the user; ie., we don't disable automatically
+                       // (see comments in find_disabled_blocks()).
+                       DISABLE_IF_OTHER_ENABLED
+               } condition;
+               std::string declaration_point;  // For error messages.
+       };
+       std::vector<Disabler> disablers;
        int currently_chosen_alternative = 0;
        // What alternative to use if the block is disabled.
        // Points to an alternative with IDENTITY_EFFECT if it exists
@@ -125,6 +139,7 @@ int Block_enable(lua_State *L);
 int Block_enable_if(lua_State *L);
 int Block_disable(lua_State *L);
 int Block_always_disable_if_disabled(lua_State *L);
+int Block_promise_to_disable_if_enabled(lua_State *L);
 int Block_set_int(lua_State *L);
 int Block_set_float(lua_State *L);
 int Block_set_vec3(lua_State *L);