Refactor decoration-related code

Split up ModApiMapgen::l_register_decoration()
Define and make use of CONTAINS() and ARRLEN() macros

7 files changed, 152 insertions, 136 deletions

diff --git a/src/clouds.cpp b/src/clouds.cpp
index 1bf6dc9c1..10ac8f5b3 100644
--- a/src/clouds.cpp
+++ b/src/clouds.cpp
@@ -189,7 +189,7 @@ void Clouds::render()
 	}
 
 #define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
-#define CONTAINS(x, z, radius) \
+#define INAREA(x, z, radius) \
 	((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
 
 	for(s16 zi0=-cloud_radius_i; zi0<cloud_radius_i; zi0++)
@@ -247,7 +247,7 @@ void Clouds::render()
 				v[3].Pos.set( rx, ry,-rz);
 				break;
 			case 1: // back
-				if(CONTAINS(xi, zi-1, cloud_radius_i)){
+				if(INAREA(xi, zi-1, cloud_radius_i)){
 					u32 j = GETINDEX(xi, zi-1, cloud_radius_i);
 					if(grid[j])
 						continue;
@@ -262,7 +262,7 @@ void Clouds::render()
 				v[3].Pos.set(-rx,-ry,-rz);
 				break;
 			case 2: //right
-				if(CONTAINS(xi+1, zi, cloud_radius_i)){
+				if(INAREA(xi+1, zi, cloud_radius_i)){
 					u32 j = GETINDEX(xi+1, zi, cloud_radius_i);
 					if(grid[j])
 						continue;
@@ -277,7 +277,7 @@ void Clouds::render()
 				v[3].Pos.set( rx,-ry,-rz);
 				break;
 			case 3: // front
-				if(CONTAINS(xi, zi+1, cloud_radius_i)){
+				if(INAREA(xi, zi+1, cloud_radius_i)){
 					u32 j = GETINDEX(xi, zi+1, cloud_radius_i);
 					if(grid[j])
 						continue;
@@ -292,7 +292,7 @@ void Clouds::render()
 				v[3].Pos.set( rx,-ry, rz);
 				break;
 			case 4: // left
-				if(CONTAINS(xi-1, zi, cloud_radius_i)){
+				if(INAREA(xi-1, zi, cloud_radius_i)){
 					u32 j = GETINDEX(xi-1, zi, cloud_radius_i);
 					if(grid[j])
 						continue;
diff --git a/src/mapgen.cpp b/src/mapgen.cpp
index b7c929be7..11f76984d 100644
--- a/src/mapgen.cpp
+++ b/src/mapgen.cpp
@@ -149,9 +149,10 @@ void OreScatter::generate(ManualMapVoxelManipulator *vm, int seed,
 				continue;
 
 			u32 i = vm->m_area.index(x0 + x1, y0 + y1, z0 + z1);
-			for (size_t ii = 0; ii < c_wherein.size(); ii++)
-				if (vm->m_data[i].getContent() == c_wherein[ii])
-					vm->m_data[i] = n_ore;
+			if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
+				continue;
+
+			vm->m_data[i] = n_ore;
 		}
 	}
 }
@@ -187,13 +188,10 @@ void OreSheet::generate(ManualMapVoxelManipulator *vm, int seed,
 			u32 i = vm->m_area.index(x, y, z);
 			if (!vm->m_area.contains(i))
 				continue;
+			if (!CONTAINS(c_wherein, vm->m_data[i].getContent()))
+				continue;
 
-			for (size_t ii = 0; ii < c_wherein.size(); ii++) {
-				if (vm->m_data[i].getContent() == c_wherein[ii]) {
-					vm->m_data[i] = n_ore;
-					break;
-				}
-			}
+			vm->m_data[i] = n_ore;
 		}
 	}
 }
@@ -360,53 +358,56 @@ void Decoration::placeCutoffs(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
 
 ///////////////////////////////////////////////////////////////////////////////
 
-
-void DecoSimple::generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p) {
-	ManualMapVoxelManipulator *vm = mg->vm;
+bool DecoSimple::canPlaceDecoration(ManualMapVoxelManipulator *vm, v3s16 p) {
+	// Don't bother if there aren't any decorations to place
+	if (c_decos.size() == 0)
+		return false;
 
 	u32 vi = vm->m_area.index(p);
-	content_t c = vm->m_data[vi].getContent();
-	size_t idx;
-	for (idx = 0; idx != c_place_on.size(); idx++) {
-		if (c == c_place_on[idx])
-			break;
-	}
-	if ((idx != 0) && (idx == c_place_on.size()))
-		return;
 
-	if (nspawnby != -1) {
-		int nneighs = 0;
-		v3s16 dirs[8] = { // a Moore neighborhood
-			v3s16( 0, 0,  1),
-			v3s16( 0, 0, -1),
-			v3s16( 1, 0,  0),
-			v3s16(-1, 0,  0),
-			v3s16( 1, 0,  1),
-			v3s16(-1, 0,  1),
-			v3s16(-1, 0, -1),
-			v3s16( 1, 0, -1)
-		};
-
-		for (int i = 0; i != 8; i++) {
-			u32 index = vm->m_area.index(p + dirs[i]);
-			if (!vm->m_area.contains(index))
-				continue;
+	// Check if the decoration can be placed on this node
+	if (!CONTAINS(c_place_on, vm->m_data[vi].getContent()))
+		return false;
 
-			content_t c = vm->m_data[index].getContent();
-			for (size_t j = 0; j != c_spawnby.size(); j++) {
-				if (c == c_spawnby[j]) {
-					nneighs++;
-					break;
-				}
-			}
-		}
+	// Don't continue if there are no spawnby constraints
+	if (nspawnby == -1)
+		return true;
+
+	int nneighs = 0;
+	v3s16 dirs[8] = {
+		v3s16( 0, 0,  1),
+		v3s16( 0, 0, -1),
+		v3s16( 1, 0,  0),
+		v3s16(-1, 0,  0),
+		v3s16( 1, 0,  1),
+		v3s16(-1, 0,  1),
+		v3s16(-1, 0, -1),
+		v3s16( 1, 0, -1)
+	};
+
+	// Check a Moore neighborhood if there are enough spawnby nodes
+	for (size_t i = 0; i != ARRLEN(dirs); i++) {
+		u32 index = vm->m_area.index(p + dirs[i]);
+		if (!vm->m_area.contains(index))
+			continue;
 
-		if (nneighs < nspawnby)
-			return;
+		if (CONTAINS(c_spawnby, vm->m_data[index].getContent()))
+			nneighs++;
 	}
 
-	if (c_decos.size() == 0)
+	if (nneighs < nspawnby)
+		return false;
+
+	return true;
+}
+
+
+void DecoSimple::generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p) {
+	ManualMapVoxelManipulator *vm = mg->vm;
+
+	if (!canPlaceDecoration(vm, p))
 		return;
+
 	content_t c_place = c_decos[pr->range(0, c_decos.size() - 1)];
 
 	s16 height = (deco_height_max > 0) ?
@@ -415,6 +416,7 @@ void DecoSimple::generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p) {
 	height = MYMIN(height, max_y - p.Y);
 
 	v3s16 em = vm->m_area.getExtent();
+	u32 vi = vm->m_area.index(p);
 	for (int i = 0; i < height; i++) {
 		vm->m_area.add_y(em, vi, 1);
 
@@ -477,12 +479,7 @@ void DecoSchematic::generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p) {
 
 	u32 vi = vm->m_area.index(p);
 	content_t c = vm->m_data[vi].getContent();
-	size_t idx;
-	for (idx = 0; idx != c_place_on.size(); idx++) {
-		if (c == c_place_on[idx])
-			break;
-	}
-	if ((idx != 0) && (idx == c_place_on.size()))
+	if (!CONTAINS(c_place_on, c))
 		return;
 
 	Rotation rot = (rotation == ROTATE_RAND) ?
diff --git a/src/mapgen.h b/src/mapgen.h
index 01ab22730..b6efe8200 100644
--- a/src/mapgen.h
+++ b/src/mapgen.h
@@ -207,7 +207,7 @@ Ore *createOre(OreType type);
 
 
 enum DecorationType {
-	DECO_SIMPLE = 1,
+	DECO_SIMPLE,
 	DECO_SCHEMATIC,
 	DECO_LSYSTEM
 };
@@ -262,6 +262,7 @@ public:
 
 	~DecoSimple() {}
 
+	bool canPlaceDecoration(ManualMapVoxelManipulator *vm, v3s16 p);
 	virtual void generate(Mapgen *mg, PseudoRandom *pr, s16 max_y, v3s16 p);
 	virtual int getHeight();
 	virtual std::string getName();
diff --git a/src/nodedef.h b/src/nodedef.h
index 489aefffd..f41017f63 100644
--- a/src/nodedef.h
+++ b/src/nodedef.h
@@ -350,7 +350,7 @@ public:
 		before the pending request had been satisfied, cancelNodeList() must be
 		called.
 
-		@param nodename Name of node (or node group) to be resolved. 
+		@param nodename Name of node (or node group) to be resolved.
 		@param content_vec Pointer to content_t vector onto which the results
 			are added.
 
diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
index d0337cad6..75f5afa88 100644
--- a/src/script/lua_api/l_mapgen.cpp
+++ b/src/script/lua_api/l_mapgen.cpp
@@ -354,12 +354,7 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
 	NodeResolver *resolver = getServer(L)->getNodeDefManager()->getResolver();
 
 	enum DecorationType decotype = (DecorationType)getenumfield(L, index,
-				"deco_type", es_DecorationType, 0);
-	if (decotype == 0) {
-		errorstream << "register_decoration: unrecognized "
-			"decoration placement type";
-		return 0;
-	}
+				"deco_type", es_DecorationType, -1);
 
 	Decoration *deco = createDecoration(decotype);
 	if (!deco) {
@@ -398,90 +393,100 @@ int ModApiMapgen::l_register_decoration(lua_State *L)
 	}
 
 	//// Handle decoration type-specific parameters
+	bool success = false;
 	switch (decotype) {
-		case DECO_SIMPLE: {
-			DecoSimple *dsimple = (DecoSimple *)deco;
+		case DECO_SIMPLE:
+			success = regDecoSimple(L, resolver, (DecoSimple *)deco);
+			break;
+		case DECO_SCHEMATIC:
+			success = regDecoSchematic(L, resolver, (DecoSchematic *)deco);
+			break;
+		case DECO_LSYSTEM:
+			break;
+	}
 
-			dsimple->deco_height     = getintfield_default(L, index, "height", 1);
-			dsimple->deco_height_max = getintfield_default(L, index, "height_max", 0);
-			dsimple->nspawnby        = getintfield_default(L, index, "num_spawn_by", -1);
+	if (!success) {
+		delete deco;
+		return 0;
+	}
 
-			if (dsimple->deco_height <= 0) {
-				errorstream << "register_decoration: simple decoration height"
-					" must be greater than 0" << std::endl;
-				delete dsimple;
-				return 0;
-			}
+	emerge->decorations.push_back(deco);
 
-			std::vector<const char *> deco_names;
-			getstringlistfield(L, index, "decoration", deco_names);
-			if (deco_names.size() == 0) {
-				errorstream << "register_decoration: no decoration nodes "
-					"defined" << std::endl;
-				delete dsimple;
-				return 0;
-			}
+	verbosestream << "register_decoration: decoration '" << deco->getName()
+		<< "' registered" << std::endl;
 
-			std::vector<const char *> spawnby_names;
-			getstringlistfield(L, index, "spawn_by", spawnby_names);
-			if (dsimple->nspawnby != -1 && spawnby_names.size() == 0) {
-				errorstream << "register_decoration: no spawn_by nodes defined,"
-					" but num_spawn_by specified" << std::endl;
-				delete dsimple;
-				return 0;
-			}
+	return 0;
+}
 
-			for (size_t i = 0; i != deco_names.size(); i++)
-				resolver->addNodeList(deco_names[i], &dsimple->c_decos);
-			for (size_t i = 0; i != spawnby_names.size(); i++)
-				resolver->addNodeList(spawnby_names[i], &dsimple->c_spawnby);
+bool ModApiMapgen::regDecoSimple(lua_State *L,
+		NodeResolver *resolver, DecoSimple *deco)
+{
+	int index = 1;
 
-			break;
-		}
-		case DECO_SCHEMATIC: {
-			DecoSchematic *dschem = (DecoSchematic *)deco;
+	deco->deco_height     = getintfield_default(L, index, "height", 1);
+	deco->deco_height_max = getintfield_default(L, index, "height_max", 0);
+	deco->nspawnby        = getintfield_default(L, index, "num_spawn_by", -1);
 
-			dschem->flags = 0;
-			getflagsfield(L, index, "flags", flagdesc_deco_schematic,
-				&dschem->flags, NULL);
+	if (deco->deco_height <= 0) {
+		errorstream << "register_decoration: simple decoration height"
+			" must be greater than 0" << std::endl;
+		return false;
+	}
 
-			dschem->rotation = (Rotation)getenumfield(L, index,
-				"rotation", es_Rotation, ROTATE_0);
+	std::vector<const char *> deco_names;
+	getstringlistfield(L, index, "decoration", deco_names);
+	if (deco_names.size() == 0) {
+		errorstream << "register_decoration: no decoration nodes "
+			"defined" << std::endl;
+		return false;
+	}
 
-			std::map<std::string, std::string> replace_names;
-			lua_getfield(L, index, "replacements");
-			if (lua_istable(L, -1))
-				read_schematic_replacements(L, replace_names, lua_gettop(L));
-			lua_pop(L, 1);
+	std::vector<const char *> spawnby_names;
+	getstringlistfield(L, index, "spawn_by", spawnby_names);
+	if (deco->nspawnby != -1 && spawnby_names.size() == 0) {
+		errorstream << "register_decoration: no spawn_by nodes defined,"
+			" but num_spawn_by specified" << std::endl;
+		return false;
+	}
 
-			lua_getfield(L, index, "schematic");
-			if (!read_schematic(L, -1, dschem, getServer(L))) {
-				delete dschem;
-				return 0;
-			}
-			lua_pop(L, -1);
+	for (size_t i = 0; i != deco_names.size(); i++)
+		resolver->addNodeList(deco_names[i], &deco->c_decos);
+	for (size_t i = 0; i != spawnby_names.size(); i++)
+		resolver->addNodeList(spawnby_names[i], &deco->c_spawnby);
 
-			if (!dschem->filename.empty() &&
-				!dschem->loadSchematicFile(resolver, replace_names)) {
-				errorstream << "register_decoration: failed to load schematic"
-					" file '" << dschem->filename << "'" << std::endl;
-				delete dschem;
-				return 0;
-			}
+	return true;
+}
 
-			break;
-		}
-		case DECO_LSYSTEM: {
-			//DecoLSystem *decolsystem = (DecoLSystem *)deco;
-			break;
-		}
-	}
+bool ModApiMapgen::regDecoSchematic(lua_State *L,
+		NodeResolver *resolver, DecoSchematic *deco)
+{
+	int index = 1;
 
-	emerge->decorations.push_back(deco);
+	deco->flags = 0;
+	getflagsfield(L, index, "flags", flagdesc_deco_schematic, &deco->flags, NULL);
 
-	verbosestream << "register_decoration: decoration '" << deco->getName()
-		<< "' registered" << std::endl;
-	return 0;
+	deco->rotation = (Rotation)getenumfield(L, index, "rotation",
+		es_Rotation, ROTATE_0);
+
+	std::map<std::string, std::string> replace_names;
+	lua_getfield(L, index, "replacements");
+	if (lua_istable(L, -1))
+		read_schematic_replacements(L, replace_names, lua_gettop(L));
+	lua_pop(L, 1);
+
+	lua_getfield(L, index, "schematic");
+	if (!read_schematic(L, -1, deco, getServer(L)))
+		return false;
+	lua_pop(L, -1);
+
+	if (!deco->filename.empty() &&
+		!deco->loadSchematicFile(resolver, replace_names)) {
+		errorstream << "register_decoration: failed to load schematic"
+			" file '" << deco->filename << "'" << std::endl;
+		return false;
+	}
+
+	return true;
 }
 
 // register_ore({lots of stuff})
diff --git a/src/script/lua_api/l_mapgen.h b/src/script/lua_api/l_mapgen.h
index 8ffe32893..d14471a08 100644
--- a/src/script/lua_api/l_mapgen.h
+++ b/src/script/lua_api/l_mapgen.h
@@ -22,6 +22,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include "lua_api/l_base.h"
 
+class NodeResolver;
+class DecoSimple;
+class DecoSchematic;
+
 class ModApiMapgen : public ModApiBase {
 private:
 	// get_mapgen_object(objectname)
@@ -53,6 +57,11 @@ private:
 	// place_schematic(p, schematic, rotation, replacement)
 	static int l_place_schematic(lua_State *L);
 
+	static bool regDecoSimple(lua_State *L,
+			NodeResolver *resolver, DecoSimple *deco);
+	static bool regDecoSchematic(lua_State *L,
+			NodeResolver *resolver, DecoSchematic *deco);
+
 	static struct EnumString es_BiomeTerrainType[];
 	static struct EnumString es_DecorationType[];
 	static struct EnumString es_MapgenObject[];
diff --git a/src/util/numeric.h b/src/util/numeric.h
index 8e3a617ff..ee8fea8cf 100644
--- a/src/util/numeric.h
+++ b/src/util/numeric.h
@@ -25,6 +25,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "../irr_v3d.h"
 #include "../irr_aabb3d.h"
 #include <list>
+#include <algorithm>
 
 // Calculate the borders of a "d-radius" cube
 void getFacePositions(std::list<v3s16> &list, u16 d);
@@ -139,6 +140,9 @@ inline v3s16 arealim(v3s16 p, s16 d)
 	return p;
 }
 
+#define ARRLEN(x) (sizeof(x) / sizeof((x)[0]))
+#define CONTAINS(c, v) (std::find((c).begin(), (c).end(), (v)) != (c).end())
+
 // The naive swap performs better than the xor version
 #define SWAP(t, x, y) do { \
 	t temp = x;            \