From 9f9cad1ac9faa674fc6bafdf3df41c5ea3fa3c15 Mon Sep 17 00:00:00 2001
From: frosch <frosch@openttd.org>
Date: Tue, 21 Aug 2012 19:53:08 +0000
Subject: (svn r24492) -Add: [NoGo] Useful behaviour for
 GSEngine::IsValidEngine and GSEngine::IsBuildable when outside GSCompanyMode
 scope.

---
 src/engine.cpp | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

(limited to 'src/engine.cpp')

diff --git a/src/engine.cpp b/src/engine.cpp
index 1500b9d89..541c025dd 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -146,12 +146,12 @@ Engine::~Engine()
 }
 
 /**
- * Checks whether the engine spec is properly initialised.
+ * Checks whether the engine is a valid (non-articulated part of an) engine.
  * @return true if enabled
  */
 bool Engine::IsEnabled() const
 {
-	return this->info.string_id != STR_NEWGRF_INVALID_ENGINE;
+	return this->info.string_id != STR_NEWGRF_INVALID_ENGINE && HasBit(this->info.climates, _settings_game.game_creation.landscape);
 }
 
 /**
@@ -998,8 +998,14 @@ bool IsEngineBuildable(EngineID engine, VehicleType type, CompanyID company)
 	/* check if it's an engine of specified type */
 	if (e->type != type) return false;
 
-	/* check if it's available */
-	if (company != OWNER_DEITY && !HasBit(e->company_avail, company)) return false;
+	/* check if it's available ... */
+	if (company == OWNER_DEITY) {
+		/* ... for any company (preview does not count) */
+		if (!(e->flags & ENGINE_AVAILABLE) || e->company_avail == 0) return false;
+	} else {
+		/* ... for this company */
+		if (!HasBit(e->company_avail, company)) return false;
+	}
 
 	if (!e->IsEnabled()) return false;
 
-- 
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