Biome API: Enable decorations placed on water

Add schematic decoration force placement flag

3 files changed, 18 insertions, 9 deletions

diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index e2589d226..5fa164e6b 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -792,11 +792,13 @@ Schematic attributes
 --------------------
 See section "Flag Specifier Format".
 
-Currently supported flags: `place_center_x`, `place_center_y`, `place_center_z`.
+Currently supported flags: `place_center_x`, `place_center_y`,
+			   `place_center_z`, `force_placement`.
 
 * `place_center_x`: Placement of this decoration is centered along the X axis.
 * `place_center_y`: Placement of this decoration is centered along the Y axis.
 * `place_center_z`: Placement of this decoration is centered along the Z axis.
+* `force_placement`: Schematic nodes other than "ignore" will replace existing nodes.
 
 
 HUD element types
@@ -3191,8 +3193,10 @@ Definition tables
         schematic = {
             size = {x=4, y=6, z=4},
             data = {
-                {name="cobble", param1=255, param2=0},
-                {name="dirt_with_grass", param1=255, param2=0},
+                {name="default:cobble", param1=255, param2=0},
+                {name="default:dirt_with_grass", param1=255, param2=0},
+                {name="ignore", param1=255, param2=0},
+                {name="air", param1=255, param2=0},
                  ...
             },
             yslice_prob = {
@@ -3203,7 +3207,7 @@ Definition tables
         },
     --  ^ See 'Schematic specifier' for details.
         replacements = {["oldname"] = "convert_to", ...},
-        flags = "place_center_x, place_center_z",
+        flags = "place_center_x, place_center_y, place_center_z, force_placement",
     --  ^ Flags for schematic decorations.  See 'Schematic attributes'.
         rotation = "90" -- rotate schematic 90 degrees on placement
     --  ^ Rotation can be "0", "90", "180", "270", or "random".
diff --git a/src/mg_decoration.cpp b/src/mg_decoration.cpp
index a67c3cd8c..ab9401e28 100644
--- a/src/mg_decoration.cpp
+++ b/src/mg_decoration.cpp
@@ -31,6 +31,7 @@ FlagDesc flagdesc_deco[] = {
 	{"place_center_x", DECO_PLACE_CENTER_X},
 	{"place_center_y", DECO_PLACE_CENTER_Y},
 	{"place_center_z", DECO_PLACE_CENTER_Z},
+	{"force_placement", DECO_FORCE_PLACEMENT},
 	{NULL,             0}
 };
 
@@ -140,6 +141,7 @@ size_t Decoration::placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax)
 			s16 y = mg->heightmap ?
 					mg->heightmap[mapindex] :
 					mg->findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
+			y = MYMAX(y, mg->water_level);
 
 			if (y < nmin.Y || y > nmax.Y ||
 				y < y_min  || y > y_max)
@@ -333,6 +335,8 @@ size_t DecoSchematic::generate(MMVManip *vm, PseudoRandom *pr, s16 max_y, v3s16
 	if (flags & DECO_PLACE_CENTER_Z)
 		p.Z -= (schematic->size.Z + 1) / 2;
 
+	bool force_placement = (flags & DECO_FORCE_PLACEMENT);
+
 	if (!vm->m_area.contains(p))
 		return 0;
 
@@ -344,7 +348,7 @@ size_t DecoSchematic::generate(MMVManip *vm, PseudoRandom *pr, s16 max_y, v3s16
 	Rotation rot = (rotation == ROTATE_RAND) ?
 		(Rotation)pr->range(ROTATE_0, ROTATE_270) : rotation;
 
-	schematic->blitToVManip(p, vm, rot, false, m_ndef);
+	schematic->blitToVManip(p, vm, rot, force_placement, m_ndef);
 
 	return 1;
 }
diff --git a/src/mg_decoration.h b/src/mg_decoration.h
index ab4a9377b..fd7739b92 100644
--- a/src/mg_decoration.h
+++ b/src/mg_decoration.h
@@ -35,10 +35,11 @@ enum DecorationType {
 	DECO_LSYSTEM
 };
 
-#define DECO_PLACE_CENTER_X 0x01
-#define DECO_PLACE_CENTER_Y 0x02
-#define DECO_PLACE_CENTER_Z 0x04
-#define DECO_USE_NOISE      0x08
+#define DECO_PLACE_CENTER_X  0x01
+#define DECO_PLACE_CENTER_Y  0x02
+#define DECO_PLACE_CENTER_Z  0x04
+#define DECO_USE_NOISE       0x08
+#define DECO_FORCE_PLACEMENT 0x10
 
 extern FlagDesc flagdesc_deco[];