peter1138@6583: /* $Id$ */
peter1138@6583: 
peter1138@6583: #include "stdafx.h"
peter1138@6583: #include "openttd.h"
peter1138@6583: #include "variables.h"
peter1138@6583: #include "landscape.h"
peter1138@6583: #include "debug.h"
peter1138@6583: #include "newgrf.h"
peter1138@6583: #include "newgrf_callbacks.h"
peter1138@6583: #include "newgrf_spritegroup.h"
peter1138@6583: #include "newgrf_canal.h"
peter1138@6583: 
peter1138@6583: 
peter1138@6583: /** Table of canal 'feature' sprite groups */
peter1138@6583: const SpriteGroup *_canal_sg[CF_END];
peter1138@6583: 
peter1138@6583: 
peter1138@6583: /* Random bits and triggers are not supported for canals, so the following
peter1138@6583:  * three functions are stubs. */
peter1138@6583: static uint32 CanalGetRandomBits(const ResolverObject *object)
peter1138@6583: {
peter1138@6583: 	return 0;
peter1138@6583: }
peter1138@6583: 
peter1138@6583: 
peter1138@6583: static uint32 CanalGetTriggers(const ResolverObject *object)
peter1138@6583: {
peter1138@6583: 	return 0;
peter1138@6583: }
peter1138@6583: 
peter1138@6583: 
peter1138@6583: static void CanalSetTriggers(const ResolverObject *object, int triggers)
peter1138@6583: {
peter1138@6583: 	return;
peter1138@6583: }
peter1138@6583: 
peter1138@6583: 
peter1138@6583: static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
peter1138@6583: {
peter1138@6583: 	TileIndex tile = object->u.canal.tile;
peter1138@6583: 
peter1138@6583: 	switch (variable) {
peter1138@6583: 		case 0x80:
peter1138@6583: 			return TileHeight(tile);
peter1138@6583: 
peter1138@6583: 		case 0x81:
peter1138@6583: 			return ((_opt.landscape == LT_ARCTIC && GetTileZ(tile) > GetSnowLine()) ? 4 : 0) |
peter1138@6583: 			       (_opt.landscape == LT_TROPIC ? GetTropicZone(tile) : 0);
peter1138@6583: 	}
peter1138@6583: 
peter1138@6583: 	DEBUG(grf, 1, "Unhandled canal property 0x%02X", variable);
peter1138@6583: 
peter1138@6583: 	*available = false;
peter1138@6583: 	return 0;
peter1138@6583: }
peter1138@6583: 
peter1138@6583: 
peter1138@6583: static const SpriteGroup *CanalResolveReal(const ResolverObject *object, const SpriteGroup *group)
peter1138@6583: {
peter1138@6583: 	if (group->g.real.num_loaded == 0) return NULL;
peter1138@6583: 
peter1138@6583: 	return group->g.real.loaded[0];
peter1138@6583: }
peter1138@6583: 
peter1138@6583: 
peter1138@6583: static void NewCanalResolver(ResolverObject *res, TileIndex tile)
peter1138@6583: {
peter1138@6583: 	res->GetRandomBits = &CanalGetRandomBits;
peter1138@6583: 	res->GetTriggers   = &CanalGetTriggers;
peter1138@6583: 	res->SetTriggers   = &CanalSetTriggers;
peter1138@6583: 	res->GetVariable   = &CanalGetVariable;
peter1138@6583: 	res->ResolveReal   = &CanalResolveReal;
peter1138@6583: 
peter1138@6583: 	res->u.canal.tile = tile;
peter1138@6583: 
peter1138@6583: 	res->callback        = 0;
peter1138@6583: 	res->callback_param1 = 0;
peter1138@6583: 	res->callback_param2 = 0;
peter1138@6583: 	res->last_value      = 0;
peter1138@6583: 	res->trigger         = 0;
peter1138@6583: 	res->reseed          = 0;
peter1138@6583: }
peter1138@6583: 
peter1138@6583: 
peter1138@6583: SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
peter1138@6583: {
peter1138@6583: 	ResolverObject object;
peter1138@6583: 	const SpriteGroup *group;
peter1138@6583: 
peter1138@6583: 	NewCanalResolver(&object, tile);
peter1138@6583: 
peter1138@6583: 	group = Resolve(_canal_sg[feature], &object);
peter1138@6583: 	if (group == NULL || group->type != SGT_RESULT) return 0;
peter1138@6583: 
peter1138@6583: 	return group->g.result.sprite;
peter1138@6583: }