(svn r3556) Add accessors for handling tree tiles

See tree.h for details

1 files changed, 59 insertions, 0 deletions

diff --git a/tree.h b/tree.h
new file mode 100644
index 000000000..943fcacf1
--- /dev/null
+++ b/tree.h
@@ -0,0 +1,59 @@
+/* $Id$ */
+
+#ifndef TREE_H
+#define TREE_H
+
+#include "macros.h"
+
+typedef enum TreeType {
+	TR_INVALID      = -1,
+	TR_TEMPERATE    = 0,
+	TR_SUB_ARCTIC   = 12,
+	TR_RAINFOREST   = 20,
+	TR_CACTUS       = 27,
+	TR_SUB_TROPICAL = 28,
+	TR_TOYLAND      = 32
+} TreeType;
+
+enum {
+	TR_COUNT_TEMPERATE    = TR_SUB_ARCTIC   - TR_TEMPERATE,
+	TR_COUNT_SUB_ARCTIC   = TR_RAINFOREST   - TR_SUB_ARCTIC,
+	TR_COUNT_RAINFOREST   = TR_CACTUS       - TR_RAINFOREST,
+	TR_COUNT_SUB_TROPICAL = TR_SUB_TROPICAL - TR_CACTUS,
+	TR_COUNT_TOYLAND      = 9
+};
+
+/* ground type, m2 bits 4...5
+ * valid densities (bits 6...7) in comments after the enum */
+typedef enum TreeGround {
+	TR_GRASS       = 0, // 0
+	TR_ROUGH       = 1, // 0
+	TR_SNOW_DESERT = 2  // 0-3 for snow, 3 for desert
+} TreeGround;
+
+static inline TreeType GetTreeType(TileIndex t) { return _m[t].m3; }
+static inline void SetTreeType(TileIndex t, TreeType r) { _m[t].m3 = r; }
+
+static inline TreeGround GetTreeGround(TileIndex t) { return GB(_m[t].m2, 4, 2); }
+
+static inline uint GetTreeDensity(TileIndex t) { return GB(_m[t].m2, 6, 2); }
+
+static inline void SetTreeGroundDensity(TileIndex t, TreeGround g, uint d)
+{
+	SB(_m[t].m2, 4, 2, g);
+	SB(_m[t].m2, 6, 2, d);
+}
+
+static inline void AddTreeCount(TileIndex t, int c) { _m[t].m5 += c << 6; }
+static inline uint GetTreeCount(TileIndex t) { return GB(_m[t].m5, 6, 2); }
+static inline void SetTreeCount(TileIndex t, uint c) { SB(_m[t].m5, 6, 2, c); }
+
+static inline void AddTreeGrowth(TileIndex t, int a) { _m[t].m5 += a; }
+static inline uint GetTreeGrowth(TileIndex t) { return GB(_m[t].m5, 0, 3); }
+static inline void SetTreeGrowth(TileIndex t, uint g) { SB(_m[t].m5, 0, 3, g); }
+
+static inline void AddTreeCounter(TileIndex t, int a) { _m[t].m2 += a; }
+static inline uint GetTreeCounter(TileIndex t) { return GB(_m[t].m2, 0, 4); }
+static inline void SetTreeCounter(TileIndex t, uint c) { SB(_m[t].m2, 0, 4, c); }
+
+#endif