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/* $Id$ */

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#ifndef SPRITE_H

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#define SPRITE_H

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/* The following describes bunch of sprites to be drawn together in a single 3D

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 * bounding box. Used especially for various multi-sprite buildings (like

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 * depots or stations): */

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typedef struct DrawTileSeqStruct {

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	int8 delta_x; // 0x80 is sequence terminator

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	int8 delta_y;

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	int8 delta_z;

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	byte width,height;

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	byte unk; // 'depth', just z-size; TODO: rename

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	uint32 image;

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} DrawTileSeqStruct;

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typedef struct DrawTileSprites {

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	SpriteID ground_sprite;

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	const DrawTileSeqStruct* seq;

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} DrawTileSprites;

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/**

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 * This structure is the same for both Industries and Houses.

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 * Buildings here reference a general type of construction

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 */

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typedef struct DrawBuildingsTileStruct {

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	SpriteID ground;

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	SpriteID building;

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	byte subtile_x:4;

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	byte subtile_y:4;

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	byte width:4;

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	byte height:4;

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	byte dz;

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	byte draw_proc;  /* this allows to specify a special drawing procedure.*/

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} DrawBuildingsTileStruct;

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// Iterate through all DrawTileSeqStructs in DrawTileSprites.

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#define foreach_draw_tile_seq(idx, list) for (idx = list; ((byte) idx->delta_x) != 0x80; idx++)

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// XXX Temporary include while juggling about

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#include "newgrf_spritegroup.h"

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/* This takes value (probably of the variable specified in the group) and

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 * chooses corresponding SpriteGroup accordingly to the given

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 * DeterministicSpriteGroup. */

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SpriteGroup *EvalDeterministicSpriteGroup(const DeterministicSpriteGroup *dsg, int value);

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/* Get value of a common deterministic SpriteGroup variable. */

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int GetDeterministicSpriteValue(byte var);

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/* This takes randomized bitmask (probably associated with

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 * vehicle/station/whatever) and chooses corresponding SpriteGroup

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 * accordingly to the given RandomizedSpriteGroup. */

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SpriteGroup *EvalRandomizedSpriteGroup(const RandomizedSpriteGroup *rsg, byte random_bits);

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/* Triggers given RandomizedSpriteGroup with given bitmask and returns and-mask

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 * of random bits to be reseeded, or zero if there were no triggers matched

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 * (then they are |ed to @waiting_triggers instead). */

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byte RandomizedSpriteGroupTriggeredBits(const RandomizedSpriteGroup *rsg, byte triggers, byte *waiting_triggers);

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#endif /* SPRITE_H */