raze/source/core/textures/buildtiles.cpp

/*
** buildtexture.cpp
** Handling Build textures
**
**---------------------------------------------------------------------------
** Copyright 2019 Christoph Oelckers
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
**    derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
**
*/

#include "files.h"
#include "zstring.h"
#include "buildtiles.h"
#include "image.h"

#include "palette.h"
#include "m_crc32.h"
#include "build.h"
#include "gamecontrol.h"
#include "gamefuncs.h"
#include "palettecontainer.h"
#include "texturemanager.h"
#include "c_dispatch.h"
#include "sc_man.h"
#include "gamestruct.h"
#include "hw_voxels.h"
#include "models/modeldata.h"

#include "hw_renderstate.h"

enum
{
	MAXARTFILES_BASE = 200,
	MAXARTFILES_TOTAL = 220
};


BuildTiles TileFiles;

int tileSetHightileReplacement(int picnum, int palnum, const char* filename, float alphacut, float xscale, float yscale, float specpower, float specfactor, bool indexed = false);

//==========================================================================
//
// 
//
//==========================================================================

picanm_t tileConvertAnimFormat(int32_t const picanimraw, int* lo, int* to)
{
	// Unpack a 4 byte packed anim descriptor into something more accessible
	picanm_t anm;
	anm.num = picanimraw & 63;
	*lo = (int8_t)((picanimraw >> 8) & 255);
	*to = (int8_t)((picanimraw >> 16) & 255);
	anm.sf = ((picanimraw >> 24) & 15) | (picanimraw & 192);
	anm.extra = (picanimraw >> 28) & 15;
	return anm;
}


//==========================================================================
//
// Base class for Build tile textures
// This needs a few subclasses for different use cases.
//
//==========================================================================

int FTileTexture::CopyPixels(FBitmap* bmp, int conversion)
{
	TArray<uint8_t> buffer;
	auto ppix = GetRawData();
	if (ppix)
	{
		bmp->CopyPixelData(0, 0, ppix, Width, Height, Height, 1, 0, GPalette.BaseColors);
	}
	return 0;
}

TArray<uint8_t> FTileTexture::CreatePalettedPixels(int conversion)
{
	TArray<uint8_t> buffer(Width * Height, true);
	auto p = GetRawData();
	if (p) memcpy(buffer.Data(), p, buffer.Size());
	else memset(buffer.Data(), 0, buffer.Size());
	return buffer;
}

//==========================================================================
//
// raw pixel cache. This is for accessing pixel data in the game code,
// not for rendering.
//
//==========================================================================

struct RawCacheNode
{
	TArray<uint8_t> data;
	uint64_t lastUseTime;

	RawCacheNode() = default;
	RawCacheNode(RawCacheNode& other) = default;
	RawCacheNode& operator=(RawCacheNode& other) = default;

	RawCacheNode(RawCacheNode&& other) noexcept
	{
		data = std::move(other.data);
		lastUseTime = other.lastUseTime;
	}

	RawCacheNode& operator=(RawCacheNode&& other) noexcept
	{
		data = std::move(other.data);
		lastUseTime = other.lastUseTime;
		return *this;
	}
};

//==========================================================================
//
// 
//
//==========================================================================
static TMap<int, RawCacheNode> CacheNodes;

const uint8_t* GetRawPixels(FTextureID texid)
{
	if (!texid.isValid()) return nullptr;
	auto gtex = TexMan.GetGameTexture(texid);
	auto tex = dynamic_cast<FImageTexture*>(gtex->GetTexture());

	if (!tex || !tex->GetImage()) return nullptr;
	auto img = tex->GetImage();
	auto timg = dynamic_cast<FTileTexture*>(img);
	if (!timg || !timg->GetRawData())
	{
		auto cache = CacheNodes.CheckKey(texid.GetIndex());
		if (cache)
		{
			cache->lastUseTime = I_nsTime();
			return cache->data.Data();
		}
		RawCacheNode newnode;
		newnode.data = img->GetPalettedPixels(0);
		newnode.lastUseTime = I_nsTime();
		auto retval =newnode.data.Data();
		CacheNodes.Insert(texid.GetIndex(), std::move(newnode));
		return retval;
	}
	else
	{
		return timg->GetRawData();
	}
}

//==========================================================================
//
//To use this the texture must have been made writable during texture init.
//
//==========================================================================

uint8_t* GetWritablePixels(FTextureID texid)
{
	if (!texid.isValid()) return nullptr;
	auto gtex = TexMan.GetGameTexture(texid);
	auto tex = dynamic_cast<FImageTexture*>(gtex->GetTexture());

	if (!tex || !tex->GetImage()) return nullptr;
	auto timg = dynamic_cast<FWritableTile*>(tex->GetImage());
	if (!timg) return nullptr;
	gtex->CleanHardwareData();	// we can safely assume that this only gets called when the texture is about to be changed.
	return timg->GetRawData();
}

//==========================================================================
//
// 
//
//==========================================================================

static FGameTexture* GetTileTexture(const char* name, const TArray<uint8_t>& backingstore, uint32_t offset, int width, int height)
{
	auto tex = new FArtTile(backingstore, offset, width, height);
	auto p = &backingstore[offset];
	auto siz = width * height;
	for (int i = 0; i < siz; i++, p++)
	{
		// move transparent color to index 0 to get in line with the rest of the texture management.
		if (*p == 0) *p = 255;
		else if (*p == 255) *p = 0;
	}

	if (tex)
	{
		return MakeGameTexture(new FImageTexture(tex), name, ETextureType::Any);
	}
	return nullptr;
}


void BuildTiles::Init()
{
	Placeholder = TexMan.GameByIndex(0);
	tiledata.Resize(MAXTILES);
	memset(tiledata.Data(), 0, sizeof(tiledata[0]) * MAXTILES);
	for (auto& tile : tiledata)
	{
		tile.texture = Placeholder;
		tile.alphaThreshold = 0.5;
	}

}
//==========================================================================
//
// 
//
//==========================================================================

void BuildTiles::AddTile(int tilenum, FGameTexture* tex)
{
	if (!tex->GetID().isValid())
		TexMan.AddGameTexture(tex);
	tiledata[tilenum].texture = tex;
}

//===========================================================================
//
// AddTiles
//
// Adds all the tiles in an artfile to the texture manager.
//
//===========================================================================

void BuildTiles::AddTiles (int firsttile, TArray<uint8_t>& RawData, const char *mapname)
{

	const uint8_t *tiles = RawData.Data();
//	int numtiles = LittleLong(((uint32_t *)tiles)[1]);	// This value is not reliable
	int tilestart = LittleLong(((int *)tiles)[2]);
	int tileend = LittleLong(((int *)tiles)[3]);
	const uint16_t *tilesizx = &((const uint16_t *)tiles)[8];
	const uint16_t *tilesizy = &tilesizx[tileend - tilestart + 1];
	const uint32_t *picanm = (const uint32_t *)&tilesizy[tileend - tilestart + 1];
	const uint8_t *tiledata = (const uint8_t *)&picanm[tileend - tilestart + 1];

	if (firsttile != -1)
	{
		tileend = tileend - tilestart + firsttile;
		tilestart = firsttile;
	}

	for (int i = tilestart; i <= tileend; ++i)
	{
		int pic = i - tilestart;
		int width = LittleShort(tilesizx[pic]);
		int height = LittleShort(tilesizy[pic]);
		uint32_t anm = LittleLong(picanm[pic]);
		int size = width*height;

		if (width <= 0 || height <= 0) continue;

		FString texname;
		if (mapname) texname.Format("maptile_%s_%05d", mapname, i);
		else texname.Format("#%05d", i);
		auto tex = GetTileTexture(texname, RawData, uint32_t(tiledata - tiles), width, height);
		AddTile(i, tex);
		int leftoffset, topoffset;
		this->tiledata[i].picanm = tileConvertAnimFormat(anm, &leftoffset, &topoffset);
		tex->SetOffsets(leftoffset, topoffset);

		tiledata += size;
	}
}

//===========================================================================
//
// CountTiles
//
// Returns the number of tiles provided by an artfile
//
//===========================================================================

int CountTiles (const char *fn, const uint8_t *RawData)
{
	int version = LittleLong(*(uint32_t *)RawData);
	if (version != 1)
	{
		Printf("%s: Invalid art file version.  Must be 1, got %d\n", fn, version);
		return 0;
	}

	int tilestart = LittleLong(((uint32_t *)RawData)[2]);
	int tileend = LittleLong(((uint32_t *)RawData)[3]);

	if ((unsigned)tilestart >= MAXUSERTILES || (unsigned)tileend >= MAXUSERTILES)
	{
		Printf("%s: Invalid tilestart or tileend\n", fn);
		return 0;
	}
	if (tileend < tilestart)
	{
		Printf("%s: tileend < tilestart\n", fn);
		return 0;
	}

	return tileend >= tilestart ? tileend - tilestart + 1 : 0;
}

//===========================================================================
//
// MakeCanvas
//
// Turns texture into a canvas (i.e. camera texture)
//
//===========================================================================

void BuildTiles::MakeCanvas(int tilenum, int width, int height)
{
	auto canvas = ValidateCustomTile(tilenum, ReplacementType::Canvas);
	canvas->SetSize(width*4, height*4);
	canvas->SetDisplaySize((float)width, (float)height);
	canvas->GetTexture()->SetSize(width * 4, height * 4);
	static_cast<FCanvasTexture*>(canvas->GetTexture())->aspectRatio = (float)width / height;
}

//===========================================================================
//
// LoadArtFile
//
// Returns the number of tiles found.
//
// let's load everything into memory on startup.
//
//===========================================================================

int BuildTiles::LoadArtFile(const char *fn, const char *mapname, int firsttile)
{
	unsigned old = FindFile(fn);
	if (old >= ArtFiles.Size())	// Do not process if already loaded.
	{
		FileReader fr = fileSystem.OpenFileReader(fn);
		if (fr.isOpen())
		{
			auto artdata = fr.Read();
			const uint8_t *artptr = artdata.Data();
			if (artdata.Size() > 16)
			{
				if (memcmp(artptr, "BUILDART", 8) == 0)
				{
					artdata.Delete(0, 8);
				}
				// Only load the data if the header is present
				if (CountTiles(fn, artptr) > 0)
				{
					auto file = new BuildArtFile;
					ArtFiles.Push(file);
					file->filename = fn;
					file->RawData = std::move(artdata);
					AddTiles(firsttile, file->RawData, mapname);
				}
			}
		}
		else
		{
			//Printf("%s: file not found\n", fn);
			return -1;
		}
	}
	return 0;
}

//==========================================================================
//
// 
//
//==========================================================================

void BuildTiles::LoadArtSet(const char* filename)
{
	for (int index = 0; index < MAXARTFILES_BASE; index++)
	{
		FStringf fn(filename, index);
		LoadArtFile(fn, nullptr);
	}
	for (auto& addart : addedArt)
	{
		LoadArtFile(addart, nullptr);
	}
}

//===========================================================================
//
//
//
//===========================================================================

void BuildTiles::SetAliases()
{
	TMap<FName, int>::Iterator it(nametoindex);
	TMap<FName, int>::Pair* pair;
	while (it.NextPair(pair))
		TexMan.AddAlias(pair->Key.GetChars(), tileGetTexture(pair->Value));
}

//==========================================================================
//
// Checks if a custom tile has alredy been added to the list.
// For each tile index there may only be one replacement and its
// type may never change!
//
// All these uses will need some review further down the line so that the texture manager's content is immutable.
//
//==========================================================================

FGameTexture* BuildTiles::ValidateCustomTile(int tilenum, ReplacementType type)
{
	if (locked) I_FatalError("Modifying tiles after startup is not allowed.");
	if (tilenum < 0 || tilenum >= MAXTILES) return nullptr;
	auto &td = tiledata[tilenum];
	auto tile = td.texture;
	auto reptype = td.replacement;
	if (reptype == type) return tile;		// already created
	if (reptype > ReplacementType::Art) return nullptr;		// different custom type - cannot replace again.
	FTexture* replacement = nullptr;
	td.replacement = type;
	if (type == ReplacementType::Writable)
	{
		// Creates an empty writable tile.
		// Current use cases are:
		// Blood's 'lens' effect (apparently MP only) - combination of a camera texture with a distortion map - should be made a shader effect to be applied to the camera texture.
		replacement = new FImageTexture(new FWritableTile);
	}
	else if (type == ReplacementType::Restorable)
	{
		// This is for modifying an existing tile.
		// It only gets used for a few specific effects:
		// A) the fire in Blood.
		// B) the pin display in Redneck Rampage's bowling lanes.
		// C) Exhumed's menu plus one special effect tile.
		if (tile->GetTexelWidth() == 0 || tile->GetTexelHeight() == 0) return nullptr;	// The base must have a size for this to work.
		replacement = new FImageTexture(new FRestorableTile(tile->GetTexture()->GetImage()));
	}
	else if (type == ReplacementType::Canvas)
	{
		replacement = new FCanvasTexture(1, 1);
	}
	else return nullptr;
	auto rep = MakeGameTexture(replacement, tile->GetName(), ETextureType::Override);
	AddTile(tilenum, rep);
	return rep;
}

//==========================================================================
//
// Creates a tile for displaying custom content
//
//==========================================================================

uint8_t* BuildTiles::tileCreate(int tilenum, int width, int height)
{
	if (width <= 0 || height <= 0) return nullptr;
	auto tex = ValidateCustomTile(tilenum, ReplacementType::Writable);
	if (tex == nullptr) return nullptr;
	auto wtex = static_cast<FWritableTile*>(tex->GetTexture()->GetImage());
	if (!wtex->ResizeImage(width, height)) return nullptr;
	tex->SetSize(width, height);
	return wtex->GetRawData();
}

//==========================================================================
//
// Makes a tile writable - only used for a handful of special cases
// (todo: Investigate how to get rid of this)
//
//==========================================================================

uint8_t* BuildTiles::tileMakeWritable(int num)
{
	auto tex = ValidateCustomTile(num, ReplacementType::Restorable);
	auto wtex = static_cast<FWritableTile*>(tex->GetTexture()->GetImage());
	return wtex ? wtex->GetRawData() : nullptr;
}

//==========================================================================
//
// Returns checksum for a given tile
//
//==========================================================================

int32_t tileGetCRC32(int tileNum)
{
	if ((unsigned)tileNum >= (unsigned)MAXTILES) return 0;
	auto tile = dynamic_cast<FArtTile*>(TileFiles.tiledata[tileNum].texture->GetTexture()->GetImage());	// only consider original ART tiles.
	if (!tile) return 0;
	auto pixels = tile->GetRawData();
	if (!pixels) return 0;

	auto size = tile->GetWidth() * tile->GetHeight();
	if (size == 0) return 0;

	// Temporarily revert the data to its original form with 255 being transparent. Otherwise the CRC won't match.
	auto p = pixels;
	for (int i = 0; i < size; i++, p++)
	{
		// move transparent color to index 0 to get in line with the rest of the texture management.
		if (*p == 0) *p = 255;
		else if (*p == 255) *p = 0;
	}

	auto crc = crc32(0, (const Bytef*)pixels, size);

	// ... and back again.
	p = pixels;
	for (int i = 0; i < size; i++, p++)
	{
		// move transparent color to index 0 to get in line with the rest of the texture management.
		if (*p == 0) *p = 255;
		else if (*p == 255) *p = 0;
	}
	return crc;
}

CCMD(tilecrc)
{
	if (argv.argc() > 1)
	{
		int tile = atoi(argv[1]);
		Printf("%d\n", tileGetCRC32(tile));
	}
}

//==========================================================================
//
// Import a tile from an external image.
// This has been signifcantly altered so it may not cover everything yet.
//
//==========================================================================

int tileImportFromTexture(const char* fn, int tilenum, int alphacut, int istexture)
{
	FTextureID texid = TexMan.CheckForTexture(fn, ETextureType::Any, FTextureManager::TEXMAN_ForceLookup);
	if (!texid.isValid()) return -1;
	auto tex = TexMan.GetGameTexture(texid);

	int32_t xsiz = tex->GetTexelWidth(), ysiz = tex->GetTexelHeight();

	if (xsiz <= 0 || ysiz <= 0)
		return -2;

	// create a new game texture here - we want to give it a different name!
	tex = MakeGameTexture(tex->GetTexture(), FStringf("#%05d", tilenum), ETextureType::Override);
	TileFiles.AddTile(tilenum, tex);
	if (istexture)
		tileSetHightileReplacement(tilenum, 0, fn, (float)(255 - alphacut) * (1.f / 255.f), 1.0f, 1.0f, 1.0, 1.0);
	return 0;

}

//==========================================================================
//
// Copies a tile into another and optionally translates its palette.
//
//==========================================================================

void tileCopy(int tile, int source, int pal, int xoffset, int yoffset, int flags)
{
	picanm_t* picanm = nullptr;
	picanm_t* sourceanm = nullptr;
	int srcxo, srcyo;
	FGameTexture* tex;

	if (pal == -1 && tile == source)
	{
		// Only modify the picanm info.
		tex = tileGetTexture(tile);
		if (!tex) return;
		picanm = &TileFiles.tiledata[tile].picanm;
		sourceanm = picanm;
		srcxo = tex->GetTexelLeftOffset(0);
		srcyo = tex->GetTexelTopOffset(0);
	}
	else
	{
		if (source == -1) source = tile;
		tex = tileGetTexture(source);
		if (!tex) return;
		sourceanm = &TileFiles.tiledata[source].picanm;
		srcxo = tex->GetTexelLeftOffset(0);
		srcyo = tex->GetTexelTopOffset(0);

		TArray<uint8_t> buffer = tex->GetTexture()->Get8BitPixels(false);

		if (pal != -1)
		{
			auto remap = lookups.getTable(pal);
			for (auto& pixel : buffer)
			{
				pixel = remap[pixel];
			}
		}
		tex = MakeGameTexture(new FImageTexture(new FLooseTile(buffer, tex->GetTexelWidth(), tex->GetTexelHeight())), FStringf("#%05d", tile), ETextureType::Any);
		picanm = &TileFiles.tiledata[tile].picanm;
		TileFiles.AddTile(tile, tex);
	}

	if (xoffset != -1024) srcxo = clamp(xoffset, -128, 127);
	if (yoffset != -1024) srcyo = clamp(yoffset, -128, 127);
	tex->SetOffsets(srcxo, srcyo);
	picanm->sf = (picanm->sf & ~PICANM_MISC_MASK) | (sourceanm->sf & PICANM_MISC_MASK) | flags;
}

//==========================================================================
//
//
//
//==========================================================================
FImageSource* CreateEmptyTexture();

void tileDelete(int tile)
{
	if (TileFiles.locked) 
		I_FatalError("Modifying tiles after startup is not allowed.");

	// explicitly deleted textures must be unique null textures
	auto nulltex = MakeGameTexture(new FImageTexture(CreateEmptyTexture()), FStringf("#%05d", tile), ETextureType::Null);
	TileFiles.AddTile(tile, nulltex);
	TileFiles.tiledata[tile].replacement = ReplacementType::Art; // whatever this was, now it isn't anymore.
	tiletovox[tile] = -1; // clear the link but don't clear the voxel. It may be in use for another tile.
	modelManager.UndefineTile(tile);
}

//==========================================================================
//
//
//
//==========================================================================

void tileSetDummy(int tile, int width, int height)
{
	if (width == 0 || height == 0)
	{
		tileDelete(tile);
	}
	else if (width > 0 && height > 0)
	{
		FStringf texname("#%05d", tile);
		auto dtile = MakeGameTexture(new FImageTexture(new FDummyTile(width, height)), texname, ETextureType::Any);
		TileFiles.AddTile(tile, dtile);
	}
}

//==========================================================================
//
//
//
//==========================================================================

void BuildTiles::CloseAll()
{
	ArtFiles.DeleteAndClear();
}

//==========================================================================
//
//  Retrieve animation offset
//
//==========================================================================

int tileAnimateOfs(int tilenum, int randomize)
{
	int framecount = picanm[tilenum].num;
	if (framecount > 0)
	{
		int frametime = !isBlood() ? I_GetBuildTime() : PlayClock;
	
		if (isBlood() && randomize)
		{
			frametime += Bcrc32(&randomize, 2, 0);
		}
	
		int curframe = (frametime & 0x7fffffff) >> (picanm[tilenum].speed());
		
		switch (picanm[tilenum].type())
		{
		case PICANM_ANIMTYPE_FWD:
			return curframe % (framecount + 1);
		case PICANM_ANIMTYPE_BACK:
			return -(curframe % (framecount + 1));
		case PICANM_ANIMTYPE_OSC:
			curframe = curframe % (framecount << 1);
			if (curframe >= framecount) return (framecount << 1) - curframe;
			else return curframe;
		}
	}
	return 0;
}

//===========================================================================
// 
//	Picks a texture for rendering for a given tilenum/palette combination
//
//===========================================================================

void tileUpdateAnimations()
{
	for (int i = 0; i < MAXTILES; i++)
	{
		if (TileFiles.tiledata[i].picanm.type())
		{
			int j = i + tileAnimateOfs(i);

			auto id1 = TileFiles.tiledata[i].texture->GetID();
			auto id2 = TileFiles.tiledata[j].texture->GetID();
			TexMan.SetTranslation(id1, id2);
		}
	}
}

//===========================================================================
// 
//	validates the texture for rendering to a given tilenum
//
//===========================================================================

FCanvasTexture* tileGetCanvas(int tilenum)
{
	auto tex = tileGetTexture(tilenum);
	if (!tex || !tex->isHardwareCanvas()) return nullptr;
	auto canvas = static_cast<FCanvasTexture*>(tex->GetTexture());
	if (!canvas) return nullptr;
	int xsiz = tex->GetTexelWidth(), ysiz = tex->GetTexelHeight();
	if (xsiz <= 0 || ysiz <= 0)
		return nullptr;
	return canvas;
}

PicAnm picanm;


// wrappers that allow partial migration to a textureID-based setup.
const FTextureID walltype::walltexture() const
{
	return tileGetTextureID(wallpicnum);
}
const FTextureID walltype::overtexture() const
{
	return tileGetTextureID(overpicnum);
}

const FTextureID sectortype::ceilingtexture() const
{
	return tileGetTextureID(ceilingpicnum);
}

const FTextureID sectortype::floortexture() const
{
	return tileGetTextureID(floorpicnum);
}

const FTextureID spritetypebase::spritetexture() const
{
	return tileGetTextureID(picnum);
}

void sectortype::setfloortexture(FTextureID tex)
{
	auto p = TileFiles.textotile.CheckKey(tex.GetIndex());
	if (p) floorpicnum = *p; 
}

void sectortype::setceilingtexture(FTextureID tex)
{
	auto p = TileFiles.textotile.CheckKey(tex.GetIndex());
	if (p) ceilingpicnum = *p;
}

void walltype::setwalltexture(FTextureID tex)
{
	auto p = TileFiles.textotile.CheckKey(tex.GetIndex());
	if (p) wallpicnum = *p; 
}

void walltype::setovertexture(FTextureID tex)
{
	auto p = TileFiles.textotile.CheckKey(tex.GetIndex());
	if (p) overpicnum = *p;
	else overpicnum = -1;	// unlike the others this one can be invalid.
}

TileOffs* GetHiresOffset(FTextureID tex)
{
	// fixme: This must return nullptr if the tile has no replacement. 
	auto p = TileFiles.textotile.CheckKey(tex.GetIndex());
	if (p && TileFiles.tiledata[*p].hiofs.xsize != 0) return &TileFiles.tiledata[*p].hiofs;
	else return nullptr;
}