Textures: introduce world-align overrides (#12540)

Many games do not care about world align textures, however texture packs should have the capabilities to change that if they have suitable textures. This commmit now introduces a node property override for world-align in particular to force a certain scale on the selected override tiles.

doc/texture_packs.txt

@@ -204,10 +204,13 @@ Here are targets you can choose from:
 | special6      | The sixth entry in the special_tiles list         |
 | inventory     | The inventory texture                             |
 | wield         | The texture used when held by the player          |
+| align_world=N | Overrides the "world align" behaviour of tiles ¹  |
 
 Nodes support all targets, but other items only support 'inventory'
 and 'wield'.
 
+¹ : `N` is an integer [0,255]. Sets align_style = "world" and scale = N on the tile, refer to lua_api.txt for details.
+
 ### Using the special targets
 
 The special* targets only apply to specific drawtypes:

src/nodedef.cpp

@@ -1445,44 +1445,52 @@ void NodeDefManager::applyTextureOverrides(const std::vector<TextureOverride> &o
 
 		ContentFeatures &nodedef = m_content_features[id];
 
+		auto apply = [&] (TileDef &tile) {
+			tile.name = texture_override.texture;
+			if (texture_override.world_scale > 0) {
+				tile.align_style = ALIGN_STYLE_WORLD;
+				tile.scale = texture_override.world_scale;
+			}
+		};
+
 		// Override tiles
 		if (texture_override.hasTarget(OverrideTarget::TOP))
-			nodedef.tiledef[0].name = texture_override.texture;
+			apply(nodedef.tiledef[0]);
 
 		if (texture_override.hasTarget(OverrideTarget::BOTTOM))
-			nodedef.tiledef[1].name = texture_override.texture;
+			apply(nodedef.tiledef[1]);
 
 		if (texture_override.hasTarget(OverrideTarget::RIGHT))
-			nodedef.tiledef[2].name = texture_override.texture;
+			apply(nodedef.tiledef[2]);
 
 		if (texture_override.hasTarget(OverrideTarget::LEFT))
-			nodedef.tiledef[3].name = texture_override.texture;
+			apply(nodedef.tiledef[3]);
 
 		if (texture_override.hasTarget(OverrideTarget::BACK))
-			nodedef.tiledef[4].name = texture_override.texture;
+			apply(nodedef.tiledef[4]);
 
 		if (texture_override.hasTarget(OverrideTarget::FRONT))
-			nodedef.tiledef[5].name = texture_override.texture;
+			apply(nodedef.tiledef[5]);
 
 
 		// Override special tiles, if applicable
 		if (texture_override.hasTarget(OverrideTarget::SPECIAL_1))
-			nodedef.tiledef_special[0].name = texture_override.texture;
+			apply(nodedef.tiledef_special[0]);
 
 		if (texture_override.hasTarget(OverrideTarget::SPECIAL_2))
-			nodedef.tiledef_special[1].name = texture_override.texture;
+			apply(nodedef.tiledef_special[1]);
 
 		if (texture_override.hasTarget(OverrideTarget::SPECIAL_3))
-			nodedef.tiledef_special[2].name = texture_override.texture;
+			apply(nodedef.tiledef_special[2]);
 
 		if (texture_override.hasTarget(OverrideTarget::SPECIAL_4))
-			nodedef.tiledef_special[3].name = texture_override.texture;
+			apply(nodedef.tiledef_special[3]);
 
 		if (texture_override.hasTarget(OverrideTarget::SPECIAL_5))
-			nodedef.tiledef_special[4].name = texture_override.texture;
+			apply(nodedef.tiledef_special[4]);
 
 		if (texture_override.hasTarget(OverrideTarget::SPECIAL_6))
-			nodedef.tiledef_special[5].name = texture_override.texture;
+			apply(nodedef.tiledef_special[5]);
 	}
 }
 

src/texture_override.cpp

@@ -26,6 +26,26 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #define override_cast static_cast<override_t>
 
+static const std::map<std::string, OverrideTarget> override_LUT = {
+	{ "top", OverrideTarget::TOP },
+	{ "bottom", OverrideTarget::BOTTOM },
+	{ "left", OverrideTarget::LEFT },
+	{ "right", OverrideTarget::RIGHT },
+	{ "front", OverrideTarget::FRONT },
+	{ "back", OverrideTarget::BACK },
+	{ "inventory", OverrideTarget::INVENTORY },
+	{ "wield", OverrideTarget::WIELD },
+	{ "special1", OverrideTarget::SPECIAL_1 },
+	{ "special2", OverrideTarget::SPECIAL_2 },
+	{ "special3", OverrideTarget::SPECIAL_3 },
+	{ "special4", OverrideTarget::SPECIAL_4 },
+	{ "special5", OverrideTarget::SPECIAL_5 },
+	{ "special6", OverrideTarget::SPECIAL_6 },
+	{ "sides", OverrideTarget::SIDES },
+	{ "all", OverrideTarget::ALL_FACES },
+	{ "*", OverrideTarget::ALL_FACES }
+};
+
 TextureOverrideSource::TextureOverrideSource(std::string filepath)
 {
 	std::ifstream infile(filepath.c_str());
@@ -41,8 +61,9 @@ TextureOverrideSource::TextureOverrideSource(std::string filepath)
 		if (line.empty() || line[0] == '#')
 			continue;
 
+		// Format: mod_name:item_name target1[,...] texture_name.png
 		std::vector<std::string> splitted = str_split(line, ' ');
-		if (splitted.size() != 3) {
+		if (splitted.size() < 3) {
 			warningstream << filepath << ":" << line_index
 					<< " Syntax error in texture override \"" << line
 					<< "\": Expected 3 arguments, got " << splitted.size()
@@ -57,45 +78,31 @@ TextureOverrideSource::TextureOverrideSource(std::string filepath)
 		// Parse the target mask
 		std::vector<std::string> targets = str_split(splitted[1], ',');
 		for (const std::string &target : targets) {
-			if (target == "top")
+			std::vector<std::string> kvpair = str_split(target, '=');
-				texture_override.target |= override_cast(OverrideTarget::TOP);
+			if (kvpair.size() == 2) {
-			else if (target == "bottom")
+				// Key-value pairs
-				texture_override.target |= override_cast(OverrideTarget::BOTTOM);
+				if (kvpair[0] == "align_world") {
-			else if (target == "left")
+					// Global textures
-				texture_override.target |= override_cast(OverrideTarget::LEFT);
+					texture_override.world_scale = stoi(kvpair[1], 0, U8_MAX);
-			else if (target == "right")
+					continue;
-				texture_override.target |= override_cast(OverrideTarget::RIGHT);
+				}
-			else if (target == "front")
+			}
-				texture_override.target |= override_cast(OverrideTarget::FRONT);
+			if (kvpair.size() == 1) {
-			else if (target == "back")
+				// Regular override flags
-				texture_override.target |= override_cast(OverrideTarget::BACK);
+				auto pair = override_LUT.find(target);
-			else if (target == "inventory")
+
-				texture_override.target |= override_cast(OverrideTarget::INVENTORY);
+				if (pair != override_LUT.end()) {
-			else if (target == "wield")
+					texture_override.target |= override_cast(pair->second);
-				texture_override.target |= override_cast(OverrideTarget::WIELD);
+					continue;
-			else if (target == "special1")
+				}
-				texture_override.target |= override_cast(OverrideTarget::SPECIAL_1);
+			}
-			else if (target == "special2")
+
-				texture_override.target |= override_cast(OverrideTarget::SPECIAL_2);
-			else if (target == "special3")
-				texture_override.target |= override_cast(OverrideTarget::SPECIAL_3);
-			else if (target == "special4")
-				texture_override.target |= override_cast(OverrideTarget::SPECIAL_4);
-			else if (target == "special5")
-				texture_override.target |= override_cast(OverrideTarget::SPECIAL_5);
-			else if (target == "special6")
-				texture_override.target |= override_cast(OverrideTarget::SPECIAL_6);
-			else if (target == "sides")
-				texture_override.target |= override_cast(OverrideTarget::SIDES);
-			else if (target == "all" || target == "*")
-				texture_override.target |= override_cast(OverrideTarget::ALL_FACES);
-			else {
 			// Report invalid target
 			warningstream << filepath << ":" << line_index
 					<< " Syntax error in texture override \"" << line
 					<< "\": Unknown target \"" << target << "\""
 					<< std::endl;
-			}
+			
 		}
 
 		// If there are no valid targets, skip adding this override

src/texture_override.h

@@ -57,7 +57,8 @@ struct TextureOverride
 {
 	std::string id;
 	std::string texture;
-	override_t target;
+	override_t target = 0;
+	u8 world_scale = 0;
 
 	// Helper function for checking if an OverrideTarget is found in
 	// a TextureOverride without casting