Add new landscape variable for ground density and snow presence

docs/newgrf-newlandscape-nml.html

@@ -81,6 +81,8 @@
 		<tr><td>tile_height</td><td>0..255</td><td>Height of the lowest corner of the tile</td></tr>
 		<tr><td>tile_hash</td><td>0..4294967295</td><td>Hash value derived from the coordinates of the tile, suitable for pseudo-randomising graphics</td></tr>
 		<tr><td>landscape_type</td><td>NEW_LANDSCAPE_TYPE_XXX</td><td>Landscape type<br />XXX = ROCKS</td></tr>
+		<tr><td>snow_present</td><td>0 or 1</td><td>Snow is present on this tile, at any density.</br>This requires <font face="monospace">new_landscape</font>, version 2.</td></tr>
+		<tr><td>ground_density</td><td>0..3</td><td>Ground density (if snow_present is 1, this is the snow density).</br>This requires <font face="monospace">new_landscape</font>, version 2.</td></tr>
 	</table>
 	<br />
 	Variables that require one or more parameters:

docs/newgrf-newlandscape.html

@@ -84,6 +84,7 @@
 		<tr><td><a href="#newlandscape_tile_height">42</a></td><td><a href="#newlandscape_tile_height">newlandscape_tile_height</a></td><td>Tile Height</td></tr>
 		<tr><td><a href="#newlandscape_tile_hash">43</a></td><td><a href="#newlandscape_tile_hash">newlandscape_tile_hash</a></td><td>Tile Hash</td></tr>
 		<tr><td><a href="#newlandscape_landscape_type">44</a></td><td><a href="#newlandscape_landscape_type">newlandscape_landscape_type</a></td><td>Landscape Type</td></tr>
+		<tr><td><a href="#newlandscape_ground_info">45</a></td><td><a href="#newlandscape_ground_info">newlandscape_ground_info</a></td><td>Ground info</td></tr>
 		<tr><td><a href="#newlandscape_land_info_nearby_tiles">60</a></td><td><a href="#newlandscape_land_info_nearby_tiles">newlandscape_land_info_nearby_tiles</a></td><td>Land info of nearby tiles</td></tr>
 	</table>
 
@@ -110,6 +111,18 @@
 	<h4 id="newlandscape_landscape_type">Landscape type (44, or mappable variable: newlandscape_landscape_type)</h4>
 	<p>The landscape type, this currently only has the value 0: rocky tiles.</p>
 
+	<h4 id="newlandscape_ground_info">Ground info (45, or mappable variable: newlandscape_ground_info)</h4>
+	<p>Miscellaneous ground info
+	<table>
+	<tr><th>Bits</th><th>Values</th><th>Meaning</th></tr>
+	<tr><td>0 - 3</td><td>0..3</td><td>Ground density (if snow is present, this is the snow density)</td></tr>
+	<tr><td>4</td><td>0 or 1</td><td>Snow is present on this tile, at any density</td></tr>
+	</table>
+	<br />
+	The remaining bits are reserved for future use and should be masked.<br />
+	This requires <font face="monospace">new_landscape</font>, version 2.</p>
+	</p>
+
 	<h4 id="roadstop_land_info_nearby_tiles">Land info of nearby tile (60, or mappable variable: newlandscape_land_info_nearby_tiles)</h4>
 	<p>This has the same value as <a href="https://newgrf-specs.tt-wiki.net/wiki/VariationalAction2/Industry_Tiles#Land_info_of_nearby_tiles_.2860.29">industry tile (feature 9) variable 60</a>.</p>
 

src/newgrf_extension.cpp

@@ -157,6 +157,7 @@ extern const GRFVariableMapDefinition _grf_action2_remappable_variables[] = {
 	GRFVariableMapDefinition(GSF_NEWLANDSCAPE, 0x42, "newlandscape_tile_height"),
 	GRFVariableMapDefinition(GSF_NEWLANDSCAPE, 0x43, "newlandscape_tile_hash"),
 	GRFVariableMapDefinition(GSF_NEWLANDSCAPE, 0x44, "newlandscape_landscape_type"),
+	GRFVariableMapDefinition(GSF_NEWLANDSCAPE, 0x45, "newlandscape_ground_info"),
 	GRFVariableMapDefinition(GSF_NEWLANDSCAPE, 0x60, "newlandscape_land_info_nearby_tiles"),
 	GRFVariableMapDefinition(),
 };

src/newgrf_newlandscape.cpp

@@ -49,6 +49,9 @@ std::vector<const GRFFile *> _new_landscape_rocks_grfs;
 		case 0x44:
 			return this->landscape_type;
 
+		case 0x45:
+			return GetClearDensity(this->ti->tile) | (IsSnowTile(this->ti->tile) ? 0x10 : 0);
+
 		case 0x60: {
 			TileIndex tile = this->ti->tile;
 			if (parameter != 0) tile = GetNearbyTile(parameter, tile); // only perform if it is required

src/table/newgrf_debug_data.h

@@ -1762,6 +1762,7 @@ static const NIVariable _niv_newlandscape[] = {
 	NIV(0x42, "tile height"),
 	NIV(0x43, "tile hash"),
 	NIV(0x44, "landscape type"),
+	NIV(0x45, "ground info"),
 	NIV(0x60, "land info of nearby tiles"),
 	NIV_END(),
 };