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/* $Id$ */

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#include "stdafx.h"

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#include "openttd.h"

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#include "bridge_map.h"

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#include "heightmap.h"

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#include "clear_map.h"

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#include "date.h"

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#include "functions.h"

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#include "map.h"

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#include "player.h"

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#include "spritecache.h"

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#include "table/sprites.h"

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#include "tile.h"

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#include <stdarg.h>

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#include "viewport.h"

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#include "command.h"

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#include "landscape.h"

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#include "vehicle.h"

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#include "variables.h"

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#include "void_map.h"

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#include "water_map.h"

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#include "tgp.h"

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#include "genworld.h"

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extern const TileTypeProcs

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	_tile_type_clear_procs,

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	_tile_type_rail_procs,

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	_tile_type_road_procs,

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	_tile_type_town_procs,

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	_tile_type_trees_procs,

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	_tile_type_station_procs,

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	_tile_type_water_procs,

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	_tile_type_dummy_procs,

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	_tile_type_industry_procs,

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	_tile_type_tunnelbridge_procs,

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	_tile_type_unmovable_procs;

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const TileTypeProcs * const _tile_type_procs[16] = {

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	&_tile_type_clear_procs,

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	&_tile_type_rail_procs,

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	&_tile_type_road_procs,

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	&_tile_type_town_procs,

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	&_tile_type_trees_procs,

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	&_tile_type_station_procs,

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	&_tile_type_water_procs,

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	&_tile_type_dummy_procs,

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	&_tile_type_industry_procs,

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	&_tile_type_tunnelbridge_procs,

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	&_tile_type_unmovable_procs,

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};

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/* landscape slope => sprite */

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const byte _tileh_to_sprite[32] = {

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	0, 1, 2, 3, 4, 5, 6,  7, 8, 9, 10, 11, 12, 13, 14, 0,

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	0, 0, 0, 0, 0, 0, 0, 16, 0, 0,  0, 17,  0, 15, 18, 0,

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};

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    59

SnowLine *_snow_line = NULL;

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/**

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 * Applys a foundation to a slope.

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 *

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 * @pre      Foundation and slope must be valid combined.

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 * @param f  The #Foundation.

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 * @param s  The #Slope to modify.

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 * @return   Increment to the tile Z coordinate.

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 */

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uint ApplyFoundationToSlope(Foundation f, Slope *s)

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{

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    72

	if (!IsFoundation(f)) return 0;

    73

    74

	if (IsLeveledFoundation(f)) {

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		*s = SLOPE_FLAT;

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		return TILE_HEIGHT;

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	}

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    89

	uint dz = IsSteepSlope(*s) ? TILE_HEIGHT : 0;

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	Corner highest_corner = GetHighestSlopeCorner(*s);

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	switch (f) {

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		case FOUNDATION_INCLINED_X:

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			*s = (((highest_corner == CORNER_W) || (highest_corner == CORNER_S)) ? SLOPE_SW : SLOPE_NE);

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			break;

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		case FOUNDATION_INCLINED_Y:

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			*s = (((highest_corner == CORNER_S) || (highest_corner == CORNER_E)) ? SLOPE_SE : SLOPE_NW);

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			break;

   100

   101

		case FOUNDATION_STEEP_LOWER:

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			*s = SlopeWithOneCornerRaised(highest_corner);

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			break;

   104

   107

			break;

   108

   109

		default: NOT_REACHED();

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	}

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	return dz;

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}

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   114

   115

uint GetPartialZ(int x, int y, Slope corners)

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{

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	if (IsHalftileSlope(corners)) {

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		switch (GetHalftileSlopeCorner(corners)) {

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			case CORNER_W:

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				if (x - y >= 0) return GetSlopeMaxZ(corners);

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				break;

   122

   123

			case CORNER_S:

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				if (x - (y ^ 0xF) >= 0) return GetSlopeMaxZ(corners);

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				break;

   126

   127

			case CORNER_E:

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				if (y - x >= 0) return GetSlopeMaxZ(corners);

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				break;

   130

   131

			case CORNER_N:

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				if ((y ^ 0xF) - x >= 0) return GetSlopeMaxZ(corners);

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				break;

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   135

			default: NOT_REACHED();

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		}

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	}

   138

   139

	int z = 0;

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	switch (corners & ~SLOPE_HALFTILE_MASK) {

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	case SLOPE_W:

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		if (x - y >= 0)

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			z = (x - y) >> 1;

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		break;

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	case SLOPE_S:

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		y ^= 0xF;

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		if ( (x - y) >= 0)

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			z = (x - y) >> 1;

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		break;

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	case SLOPE_SW:

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		z = (x >> 1) + 1;

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		break;

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	case SLOPE_E:

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		if (y - x >= 0)

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			z = (y - x) >> 1;

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		break;

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	case SLOPE_EW:

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	case SLOPE_NS:

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	case SLOPE_ELEVATED:

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		z = 4;

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		break;

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	case SLOPE_SE:

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		z = (y >> 1) + 1;

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		break;

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	case SLOPE_WSE:

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		z = 8;

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		y ^= 0xF;

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		if (x - y < 0)

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			z += (x - y) >> 1;

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		break;

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	case SLOPE_N:

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		y ^= 0xF;

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		if (y - x >= 0)

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			z = (y - x) >> 1;

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		break;

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	case SLOPE_NW:

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		z = (y ^ 0xF) >> 1;

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		break;

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	case SLOPE_NWS:

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		z = 8;

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		if (x - y < 0)

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			z += (x - y) >> 1;

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		break;

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	case SLOPE_NE:

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		z = (x ^ 0xF) >> 1;

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		break;

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	case SLOPE_ENW:

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		z = 8;

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		y ^= 0xF;

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		if (y - x < 0)

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			z += (y - x) >> 1;

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		break;

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	case SLOPE_SEN:

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		z = 8;

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		if (y - x < 0)

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			z += (y - x) >> 1;

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		break;

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	case SLOPE_STEEP_S:

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		z = 1 + ((x + y) >> 1);

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		break;

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	case SLOPE_STEEP_W:

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		z = 1 + ((x + (y ^ 0xF)) >> 1);

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		break;

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	case SLOPE_STEEP_N:

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		z = 1 + (((x ^ 0xF) + (y ^ 0xF)) >> 1);

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		break;

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	case SLOPE_STEEP_E:

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		z = 1 + (((x ^ 0xF) + y) >> 1);

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		break;

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		default: break;

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	}

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	return z;

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}

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uint GetSlopeZ(int x, int y)

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{

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	TileIndex tile = TileVirtXY(x, y);

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	return _tile_type_procs[GetTileType(tile)]->get_slope_z_proc(tile, x, y);

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}

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/**

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 * Determine the Z height of the corners of a specific tile edge

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 *

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 * @note If a tile has a non-continuous halftile foundation, a corner can have different heights wrt. it's edges.

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 *

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 * @pre z1 and z2 must be initialized (typ. with TileZ). The corner heights just get added.

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 *

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 * @param tileh The slope of the tile.

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 * @param edge The edge of interest.

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 * @param z1 Gets incremented by the height of the first corner of the edge. (near corner wrt. the camera)

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 * @param z2 Gets incremented by the height of the second corner of the edge. (far corner wrt. the camera)

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 */

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void GetSlopeZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2)

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{

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	static const Slope corners[4][4] = {

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		/*    corner     |          steep slope

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		 *  z1      z2   |       z1             z2        */

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		{SLOPE_E, SLOPE_N, SLOPE_STEEP_E, SLOPE_STEEP_N}, // DIAGDIR_NE, z1 = E, z2 = N

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		{SLOPE_S, SLOPE_E, SLOPE_STEEP_S, SLOPE_STEEP_E}, // DIAGDIR_SE, z1 = S, z2 = E

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		{SLOPE_S, SLOPE_W, SLOPE_STEEP_S, SLOPE_STEEP_W}, // DIAGDIR_SW, z1 = S, z2 = W

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		{SLOPE_W, SLOPE_N, SLOPE_STEEP_W, SLOPE_STEEP_N}, // DIAGDIR_NW, z1 = W, z2 = N

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	};

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	int halftile_test = (IsHalftileSlope(tileh) ? SlopeWithOneCornerRaised(GetHalftileSlopeCorner(tileh)) : 0);

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	if (halftile_test == corners[edge][0]) *z2 += TILE_HEIGHT; // The slope is non-continuous in z2. z2 is on the upper side.

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	if (halftile_test == corners[edge][1]) *z1 += TILE_HEIGHT; // The slope is non-continuous in z1. z1 is on the upper side.

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	if ((tileh & corners[edge][0]) != 0) *z1 += TILE_HEIGHT; // z1 is raised

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	if ((tileh & corners[edge][1]) != 0) *z2 += TILE_HEIGHT; // z2 is raised

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	if ((tileh & ~SLOPE_HALFTILE_MASK) == corners[edge][2]) *z1 += TILE_HEIGHT; // z1 is highest corner of a steep slope

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	if ((tileh & ~SLOPE_HALFTILE_MASK) == corners[edge][3]) *z2 += TILE_HEIGHT; // z2 is highest corner of a steep slope

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}

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static Slope GetFoundationSlope(TileIndex tile, uint* z)

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{

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	Slope tileh = GetTileSlope(tile, z);

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	Foundation f = _tile_type_procs[GetTileType(tile)]->get_foundation_proc(tile, tileh);

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	*z += ApplyFoundationToSlope(f, &tileh);

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	return tileh;

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}

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static bool HasFoundationNW(TileIndex tile, Slope slope_here, uint z_here)

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{

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	uint z;

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	int z_W_here = z_here;

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	int z_N_here = z_here;

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	GetSlopeZOnEdge(slope_here, DIAGDIR_NW, &z_W_here, &z_N_here);

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	Slope slope = GetFoundationSlope(TILE_ADDXY(tile, 0, -1), &z);

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	int z_W = z;

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	int z_N = z;

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	GetSlopeZOnEdge(slope, DIAGDIR_SE, &z_W, &z_N);

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	return (z_N_here > z_N) || (z_W_here > z_W);

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}

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static bool HasFoundationNE(TileIndex tile, Slope slope_here, uint z_here)

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{

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	uint z;

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	int z_E_here = z_here;

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	int z_N_here = z_here;

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	GetSlopeZOnEdge(slope_here, DIAGDIR_NE, &z_E_here, &z_N_here);

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	Slope slope = GetFoundationSlope(TILE_ADDXY(tile, -1, 0), &z);

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	int z_E = z;

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	int z_N = z;

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	GetSlopeZOnEdge(slope, DIAGDIR_SW, &z_E, &z_N);

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	return (z_N_here > z_N) || (z_E_here > z_E);

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}

   333

   334

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void DrawFoundation(TileInfo *ti, Foundation f)

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{

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	if (!IsFoundation(f)) return;

   338

   342

	uint sprite_block = 0;

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	uint z;

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	Slope slope = GetFoundationSlope(ti->tile, &z);

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	/* Select the needed block of foundations sprites

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	 * Block 0: Walls at NW and NE edge

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	 * Block 1: Wall  at        NE edge

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	 * Block 2: Wall  at NW        edge

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	 * Block 3: No walls at NW or NE edge

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	 */

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	if (!HasFoundationNW(ti->tile, slope, z)) sprite_block += 1;

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	if (!HasFoundationNE(ti->tile, slope, z)) sprite_block += 2;

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   355

	/* Use the original slope sprites if NW and NE borders should be visible */

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	SpriteID leveled_base = (sprite_block == 0 ? (int)SPR_FOUNDATION_BASE : (SPR_SLOPES_VIRTUAL_BASE + sprite_block * SPR_TRKFOUND_BLOCK_SIZE));

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	SpriteID inclined_base = SPR_SLOPES_VIRTUAL_BASE + SPR_SLOPES_INCLINED_OFFSET + sprite_block * SPR_TRKFOUND_BLOCK_SIZE;

   359

   360

	if (IsSteepSlope(ti->tileh)) {

   367

   368

		Corner highest_corner = GetHighestSlopeCorner(ti->tileh);

   369

		ti->z += ApplyFoundationToSlope(f, &ti->tileh);

   370

   371

		if (IsInclinedFoundation(f)) {

   372

			/* inclined foundation */

   373

			byte inclined = highest_corner * 2 + (f == FOUNDATION_INCLINED_Y ? 1 : 0);

   374

   375

			AddSortableSpriteToDraw(inclined_base + inclined, PAL_NONE, ti->x, ti->y, 16, 16, 1, ti->z);

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			OffsetGroundSprite(31, 9);

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			/* one corner raised */

   379

			OffsetGroundSprite(31, 1);

   387

		}

   388

	} else {

   389

		if (IsLeveledFoundation(f)) {

   390

			/* leveled foundation */

   391

			AddSortableSpriteToDraw(leveled_base + ti->tileh, PAL_NONE, ti->x, ti->y, 16, 16, 7, ti->z);

   392

			OffsetGroundSprite(31, 1);

   413

		} else {

   414

			/* inclined foundation */

   415

			byte inclined = GetHighestSlopeCorner(ti->tileh) * 2 + (f == FOUNDATION_INCLINED_Y ? 1 : 0);

   416

   417

			AddSortableSpriteToDraw(inclined_base + inclined, PAL_NONE, ti->x, ti->y, 16, 16, 1, ti->z);

   418

			OffsetGroundSprite(31, 9);

   419

		}

   420

		ti->z += ApplyFoundationToSlope(f, &ti->tileh);

   421

	}

   422

}

   423

   424

void DoClearSquare(TileIndex tile)

   425

{

   426

	MakeClear(tile, CLEAR_GRASS, _generating_world ? 3 : 0);

   427

	MarkTileDirtyByTile(tile);

   428

}

   429

   430

uint32 GetTileTrackStatus(TileIndex tile, TransportType mode, uint sub_mode)

   431

{

   432

	return _tile_type_procs[GetTileType(tile)]->get_tile_track_status_proc(tile, mode, sub_mode);

   433

}

   434

   435

void ChangeTileOwner(TileIndex tile, PlayerID old_player, PlayerID new_player)

   436

{

   437

	_tile_type_procs[GetTileType(tile)]->change_tile_owner_proc(tile, old_player, new_player);

   438

}

   439

   440

void GetAcceptedCargo(TileIndex tile, AcceptedCargo ac)

   441

{

   442

	memset(ac, 0, sizeof(AcceptedCargo));

   443

	_tile_type_procs[GetTileType(tile)]->get_accepted_cargo_proc(tile, ac);

   444

}

   445

   446

void AnimateTile(TileIndex tile)

   447

{

   448

	_tile_type_procs[GetTileType(tile)]->animate_tile_proc(tile);

   449

}

   450

   451

void ClickTile(TileIndex tile)

   452

{

   453

	_tile_type_procs[GetTileType(tile)]->click_tile_proc(tile);

   454

}

   455

   456

void GetTileDesc(TileIndex tile, TileDesc *td)

   457

{

   458

	_tile_type_procs[GetTileType(tile)]->get_tile_desc_proc(tile, td);

   459

}

   460

   461

/**

   462

 * Has a snow line table already been loaded.

   463

 * @return true if the table has been loaded already.

   464

 */

   465

bool IsSnowLineSet(void)

   466

{

   467

	return _snow_line != NULL;

   468

}

   469

   470

/**

   471

 * Set a variable snow line, as loaded from a newgrf file.

   472

 * @param table the 12 * 32 byte table containing the snowline for each day

   473

 */

   474

void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS])

   475

{

   476

	_snow_line = CallocT<SnowLine>(1);

   477

	memcpy(_snow_line->table, table, sizeof(_snow_line->table));

   478

   479

	for (uint i = 0; i < SNOW_LINE_MONTHS; i++) {

   480

		for (uint j = 0; j < SNOW_LINE_DAYS; j++) {

   481

			_snow_line->highest_value = max(_snow_line->highest_value, table[i][j]);

   482

		}

   483

	}

   484

}

   485

   486

/**

   487

 * Get the current snow line, either variable or static.

   488

 * @return the snow line height.

   489

 */

   490

byte GetSnowLine(void)

   491

{

   492

	if (_snow_line == NULL) return _opt.snow_line;

   493