From 5aaecae6e2ea2c2236375274439645e669081328 Mon Sep 17 00:00:00 2001
From: frosch <frosch@openttd.org>
Date: Tue, 8 Nov 2011 17:28:52 +0000
Subject: (svn r23153) -Change: [NewGRF v8] Use heightlevel units in variable
 20/A0.

---
 src/newgrf.cpp             | 16 ++++++++++++----
 src/newgrf.h               |  2 +-
 src/newgrf_spritegroup.cpp |  2 +-
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index e5fc2a1c1..b6461a6ce 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -5443,9 +5443,10 @@ void CheckForMissingSprites()
  *
  * @param param variable number (as for VarAction2, for Action7/9/D you have to subtract 0x80 first).
  * @param value returns the value of the variable.
+ * @param grffile NewGRF querying the variable
  * @return true iff the variable is known and the value is returned in 'value'.
  */
-bool GetGlobalVariable(byte param, uint32 *value)
+bool GetGlobalVariable(byte param, uint32 *value, const GRFFile *grffile)
 {
 	switch (param) {
 		case 0x00: // current date
@@ -5546,9 +5547,16 @@ bool GetGlobalVariable(byte param, uint32 *value)
 
 		/* case 0x1F: // locale dependent settings not implemented to avoid desync */
 
-		case 0x20: // snow line height
-			*value = _settings_game.game_creation.landscape == LT_ARCTIC ? GetSnowLine() * TILE_HEIGHT : 0xFF;
+		case 0x20: { // snow line height
+			byte snowline = GetSnowLine();
+			if (_settings_game.game_creation.landscape == LT_ARCTIC && snowline <= MAX_TILE_HEIGHT) {
+				*value = Clamp(snowline * (grffile->grf_version >= 8 ? 1 : TILE_HEIGHT), 0, 0xFE);
+			} else {
+				/* No snow */
+				*value = 0xFF;
+			}
 			return true;
+		}
 
 		case 0x21: // OpenTTD version
 			*value = _openttd_newgrf_version;
@@ -5574,7 +5582,7 @@ static uint32 GetParamVal(byte param, uint32 *cond_val)
 {
 	/* First handle variable common with VarAction2 */
 	uint32 value;
-	if (GetGlobalVariable(param - 0x80, &value)) return value;
+	if (GetGlobalVariable(param - 0x80, &value, _cur.grffile)) return value;
 
 	/* Non-common variable */
 	switch (param) {
diff --git a/src/newgrf.h b/src/newgrf.h
index 4ffd99aa8..bd6c673e8 100644
--- a/src/newgrf.h
+++ b/src/newgrf.h
@@ -174,7 +174,7 @@ void ResetPersistentNewGRFData();
 void CDECL grfmsg(int severity, const char *str, ...) WARN_FORMAT(2, 3);
 
 bool HasGrfMiscBit(GrfMiscBit bit);
-bool GetGlobalVariable(byte param, uint32 *value);
+bool GetGlobalVariable(byte param, uint32 *value, const GRFFile *grffile);
 
 StringID MapGRFStringID(uint32 grfid, StringID str);
 void ShowNewGRFError();
diff --git a/src/newgrf_spritegroup.cpp b/src/newgrf_spritegroup.cpp
index 2c89aa000..1ebf5bcf7 100644
--- a/src/newgrf_spritegroup.cpp
+++ b/src/newgrf_spritegroup.cpp
@@ -42,7 +42,7 @@ static inline uint32 GetVariable(const ResolverObject *object, byte variable, ui
 {
 	/* First handle variables common with Action7/9/D */
 	uint32 value;
-	if (GetGlobalVariable(variable, &value)) return value;
+	if (GetGlobalVariable(variable, &value, object->grffile)) return value;
 
 	/* Non-common variable */
 	switch (variable) {
-- 
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