X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=nageru%2Fscene.h;h=8db75540559cfa29bf45611319e19380bb56fc1c;hb=5e9f3fe04e04a7c53a8e64106797e14e44fe9024;hp=7d83a27e13ed3af6842c3082f6172ff68d5be25e;hpb=5a8cccb37e6832197fac3afa0fa39cf83283d5af;p=nageru

diff --git a/nageru/scene.h b/nageru/scene.h
index 7d83a27..8db7554 100644
--- a/nageru/scene.h
+++ b/nageru/scene.h
@@ -13,6 +13,7 @@
 // (directly to screen, RGBA) or live (Y'CbCr output).
 
 #include <stddef.h>
+#include <bitset>
 #include <functional>
 #include <map>
 #include <memory>
@@ -77,13 +78,36 @@ struct Block {
 	size_t cardinality_base = 0;
 
 	// Find the chosen alternative for this block in a given instance.
-	size_t chosen_alternative(size_t chain_idx) const {
-		return (chain_idx / cardinality_base) % alternatives.size();
+	int chosen_alternative(size_t chain_idx) const {
+		if (chain_idx == size_t(-1)) {
+			return currently_chosen_alternative;
+		} else {
+			return (chain_idx / cardinality_base) % alternatives.size();
+		}
 	}
 
 	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).
+
+	// 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
+	// (to disable as much as possible), otherwise 0.
+	int canonical_alternative = 0;
 	bool is_input = false;
 
 	// For LIVE_INPUT* only. We can't just always populate signal_to_connect,
@@ -105,6 +129,8 @@ struct Block {
 	std::map<std::string, float> float_parameters;
 	std::map<std::string, std::array<float, 3>> vec3_parameters;
 	std::map<std::string, std::array<float, 4>> vec4_parameters;
+
+	std::string declaration_point;  // For error messages.
 };
 
 int Block_display(lua_State* L);
@@ -112,6 +138,8 @@ int Block_choose(lua_State* L);
 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);
@@ -133,7 +161,26 @@ private:
 	movit::ResourcePool *resource_pool;
 
 	movit::Effect *instantiate_effects(const Block *block, size_t chain_idx, Instantiation *instantiation);
-	size_t compute_chain_number_for_block(size_t block_idx) const;
+	size_t compute_chain_number_for_block(size_t block_idx, const std::bitset<256> &disabled) const;
+	static void find_inputs_for_block(lua_State *L, Scene *scene, Block *block);
+
+	// Find out which blocks (indexed by position in the “blocks” array),
+	// if any, are disabled in a given instantiation. A disabled block is
+	// one that will not be instantiated at all, because it is a secondary
+	// (ie., not the first) input of some multi-input effect that was replaced
+	// with IdentityEffect in the given instantiation.
+	//
+	// Set chain_idx to size_t(-1) to use whatever is in each block's
+	// currently_chosen_alternative.
+	std::bitset<256> find_disabled_blocks(size_t chain_idx) const;
+	void find_disabled_blocks(size_t chain_idx, size_t block_idx, bool currently_disabled, std::bitset<256> *disabled) const;
+
+	// If a block is disabled, it should always have canonical_alternative chosen,
+	// so that we don't instantiate a bunch of irrelevant duplicates that
+	// differ only in disabled blocks. You can check this property with
+	// is_noncanonical_chain() and then avoid instantiating the ones where
+	// it returns true.
+	bool is_noncanonical_chain(size_t chain_idx) const;
 
 public:
 	Scene(Theme *theme, float aspect_nom, float aspect_denom);