Add GRF feature: New Landscape

Custom graphics using actions 1/2/3.

Currently only for rock tiles

src/newgrf_newlandscape.h

@@ -0,0 +1,55 @@
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file newgrf_newlandscape.h NewGRF handling of new landscape. */
+
+#ifndef NEWGRF_NEWLANDSCAPE_H
+#define NEWGRF_NEWLANDSCAPE_H
+
+#include "newgrf_commons.h"
+#include "newgrf_spritegroup.h"
+
+extern std::vector<const GRFFile *> _new_landscape_rocks_grfs;
+
+enum NewLandscapeType : uint8 {
+	NEW_LANDSCAPE_ROCKS,
+};
+
+struct TileInfo;
+
+/** Resolver for the new landscape scope. */
+struct NewLandscapeScopeResolver : public ScopeResolver {
+	const TileInfo *ti;
+	NewLandscapeType landscape_type;
+
+	NewLandscapeScopeResolver(ResolverObject &ro, const TileInfo *ti, NewLandscapeType landscape_type)
+		: ScopeResolver(ro), ti(ti), landscape_type(landscape_type)
+	{
+	}
+
+	uint32 GetVariable(uint16 variable, uint32 parameter, GetVariableExtra *extra) const override;
+};
+
+struct NewLandscapeResolverObject : public ResolverObject {
+	NewLandscapeScopeResolver newlandscape_scope;
+
+	NewLandscapeResolverObject(const GRFFile *grffile, const TileInfo *ti, NewLandscapeType landscape_type, uint32 param1 = 0, uint32 param2 = 0);
+
+	ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0) override
+	{
+		switch (scope) {
+			case VSG_SCOPE_SELF: return &this->newlandscape_scope;
+			default:             return ResolverObject::GetScope(scope, relative);
+		}
+	}
+
+	const SpriteGroup *ResolveReal(const RealSpriteGroup *group) const override;
+
+	GrfSpecFeature GetFeature() const override;
+};
+
+#endif /* NEWGRF_NEWLANDSCAPE_H */