1

/* $Id$ */

     2

     3

#include "stdafx.h"

     4

#include "openttd.h"

     5

#include "variables.h"

     6

#include "landscape.h"

     7

#include "debug.h"

     8

#include "newgrf.h"

     9

#include "newgrf_callbacks.h"

    10

#include "newgrf_commons.h"

    11

#include "newgrf_spritegroup.h"

    12

#include "newgrf_canal.h"

    13

    14

    15

/** Table of canal 'feature' sprite groups */

    16

const SpriteGroup *_canal_sg[CF_END];

    17

    18

    19

/* Random bits and triggers are not supported for canals, so the following

    20

 * three functions are stubs. */

    21

static uint32 CanalGetRandomBits(const ResolverObject *object)

    22

{

    23

	return 0;

    24

}

    25

    26

    27

static uint32 CanalGetTriggers(const ResolverObject *object)

    28

{

    29

	return 0;

    30

}

    31

    32

    33

static void CanalSetTriggers(const ResolverObject *object, int triggers)

    34

{

    35

	return;

    36

}

    37

    38

    39

static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)

    40

{

    41

	TileIndex tile = object->u.canal.tile;

    42

    43

	switch (variable) {

    44

		case 0x80:

    45

			return GetTileZ(tile) / TILE_HEIGHT;

    46

    47

		case 0x81:

    48

			return GetTerrainType(tile);

    49

	}

    50

    51

	DEBUG(grf, 1, "Unhandled canal property 0x%02X", variable);

    52

    53

	*available = false;

    54

	return 0;

    55

}

    56

    57

    58

static const SpriteGroup *CanalResolveReal(const ResolverObject *object, const SpriteGroup *group)

    59

{

    60

	if (group->g.real.num_loaded == 0) return NULL;

    61

    62

	return group->g.real.loaded[0];

    63

}

    64

    65

    66

static void NewCanalResolver(ResolverObject *res, TileIndex tile)

    67

{

    68

	res->GetRandomBits = &CanalGetRandomBits;

    69

	res->GetTriggers   = &CanalGetTriggers;

    70

	res->SetTriggers   = &CanalSetTriggers;

    71

	res->GetVariable   = &CanalGetVariable;

    72

	res->ResolveReal   = &CanalResolveReal;

    73

    74

	res->u.canal.tile = tile;

    75

    76

	res->callback        = CBID_NO_CALLBACK;

    77

	res->callback_param1 = 0;

    78

	res->callback_param2 = 0;

    79

	res->last_value      = 0;

    80

	res->trigger         = 0;

    81

	res->reseed          = 0;

    82

}

    83

    84

    85

SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)

    86

{

    87

	ResolverObject object;

    88

	const SpriteGroup *group;

    89

    90

	NewCanalResolver(&object, tile);

    91

    92

	group = Resolve(_canal_sg[feature], &object);

    93

	if (group == NULL || group->type != SGT_RESULT) return 0;

    94

    95

	return group->g.result.sprite;

    96

}