gfxinit.c
author tron
Mon, 15 Aug 2005 11:39:13 +0000
changeset 2342 c19fb4f2df30
parent 2340 0a9f3eeccb96
child 2353 076e9b569f64
permissions -rw-r--r--
(svn r2868) Change the way NewGRFs are loaded: The loading process i no longer bolted onto the normal graphics loading.
This has two major advantages:
- Removal of a maze of global variables and distinction of cases from the sprite loading routines, which weren't directly related to the loading process in the first place
- NewGRF actions no longer occupy sprite slots - for example when using DBSetXL this saves about 2000 slots! (you could regard this as a bug fix)
If i didn't make a major mistake this change should have no negative effect on NewGRF support, please test!
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/* $Id$ */
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#include "stdafx.h"
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#include "openttd.h"
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#include "debug.h"
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#include "functions.h"
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#include "gfx.h"
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#include "gfxinit.h"
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#include "spritecache.h"
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#include "table/sprites.h"
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#include "fileio.h"
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#include "newgrf.h"
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#include "md5.h"
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#include "variables.h"
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#include <ctype.h>
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typedef struct MD5File {
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	const char * const filename;     // filename
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	const md5_byte_t hash[16]; // md5 sum of the file
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} MD5File;
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typedef struct FileList {
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	const MD5File basic[5];     // grf files that always have to be loaded
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	const MD5File landscape[3]; // landscape specific grf files
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} FileList;
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#include "table/files.h"
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#include "table/landscape_sprite.h"
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static const SpriteID * const _landscape_spriteindexes[] = {
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	_landscape_spriteindexes_1,
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	_landscape_spriteindexes_2,
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	_landscape_spriteindexes_3,
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};
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static const SpriteID * const _slopes_spriteindexes[] = {
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	_slopes_spriteindexes_0,
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	_slopes_spriteindexes_1,
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	_slopes_spriteindexes_2,
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	_slopes_spriteindexes_3,
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};
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static uint LoadGrfFile(const char* filename, uint load_index, int file_index)
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{
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	uint load_index_org = load_index;
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	FioOpenFile(file_index, filename);
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	DEBUG(spritecache, 2) ("Reading grf-file ``%s''", filename);
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	while (LoadNextSprite(load_index, file_index)) {
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		load_index++;
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		if (load_index >= MAX_SPRITES) {
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			error("Too many sprites. Recompile with higher MAX_SPRITES value or remove some custom GRF files.");
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		}
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	}
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	DEBUG(spritecache, 2) ("Currently %i sprites are loaded", load_index);
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	return load_index - load_index_org;
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}
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static void LoadGrfIndexed(const char* filename, const SpriteID* index_tbl, int file_index)
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{
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	uint start;
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	FioOpenFile(file_index, filename);
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	DEBUG(spritecache, 2) ("Reading indexed grf-file ``%s''", filename);
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	for (; (start = *index_tbl++) != 0xffff;) {
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		uint end = *index_tbl++;
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		if (start == 0xfffe) { // skip sprites (amount in second var)
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			SkipSprites(end);
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		} else { // load sprites and use indexes from start to end
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			do {
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			#ifdef NDEBUG
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				LoadNextSprite(start, file_index);
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			#else
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				bool b = LoadNextSprite(start, file_index);
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				assert(b);
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			#endif
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			} while (++start <= end);
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		}
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	}
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}
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#define OPENTTD_SPRITES_COUNT 100
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static const SpriteID _openttd_grf_indexes[] = {
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	SPR_OPENTTD_BASE + 0, SPR_OPENTTD_BASE + 7, // icons etc
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	134, 134,  // euro symbol medium size
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	582, 582,  // euro symbol large size
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	358, 358,  // euro symbol tiny
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	SPR_OPENTTD_BASE+11, SPR_OPENTTD_BASE+57, // more icons
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	648, 648, // nordic char: æ
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	616, 616, // nordic char: Æ
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	666, 666, // nordic char: ø
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	634, 634, // nordic char: Ø
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	SPR_OPENTTD_BASE+62, SPR_OPENTTD_BASE + OPENTTD_SPRITES_COUNT, // more icons
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	0xffff,
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};
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/* Check that the supplied MD5 hash matches that stored for the supplied filename */
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static bool CheckMD5Digest(const MD5File file, md5_byte_t *digest, bool warn)
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{
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	uint i;
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	/* Loop through each byte of the file MD5 and the stored MD5... */
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	for (i = 0; i < 16; i++) if (file.hash[i] != digest[i]) break;
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		/* If all bytes of the MD5's match (i.e. the MD5's match)... */
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	if (i == 16) {
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		return true;
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	} else {
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		if (warn) fprintf(stderr, "MD5 of %s is ****INCORRECT**** - File Corrupt.\n", file.filename);
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		return false;
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	};
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}
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/* Calculate and check the MD5 hash of the supplied filename.
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 * returns true if the checksum is correct */
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static bool FileMD5(const MD5File file, bool warn)
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{
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	FILE *f;
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	char buf[MAX_PATH];
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	// open file
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	sprintf(buf, "%s%s", _path.data_dir, file.filename);
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	f = fopen(buf, "rb");
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#if !defined(WIN32)
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	if (f == NULL) {
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		char *s;
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	// make lower case and check again
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		for (s = buf + strlen(_path.data_dir) - 1; *s != '\0'; s++)
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			*s = tolower(*s);
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		f = fopen(buf, "rb");
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	}
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#endif
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	if (f != NULL) {
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		md5_state_t filemd5state;
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		md5_byte_t buffer[1024];
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		md5_byte_t digest[16];
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		size_t len;
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		md5_init(&filemd5state);
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		while ((len = fread(buffer, 1, sizeof(buffer), f)) != 0)
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			md5_append(&filemd5state, buffer, len);
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		if (ferror(f) && warn) fprintf(stderr, "Error Reading from %s \n", buf);
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		fclose(f);
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		md5_finish(&filemd5state, digest);
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	  return CheckMD5Digest(file, digest, warn);
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	} else { // file not found
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		return false;
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	}
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}
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/* Checks, if either the Windows files exist (TRG1R.GRF) or the DOS files (TRG1.GRF)
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 * by comparing the MD5 checksums of the files. _use_dos_palette is set accordingly.
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 * If neither are found, Windows palette is assumed.
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 *
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 * (Note: Also checks sample.cat for corruption) */
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void CheckExternalFiles(void)
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{
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	uint i;
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	// count of files from this version
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	uint dos = 0;
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	uint win = 0;
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	for (i = 0; i < 2; i++) if (FileMD5(files_dos.basic[i], true)) dos++;
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	for (i = 0; i < 3; i++) if (FileMD5(files_dos.landscape[i], true)) dos++;
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	for (i = 0; i < 2; i++) if (FileMD5(files_win.basic[i], true)) win++;
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	for (i = 0; i < 3; i++) if (FileMD5(files_win.landscape[i], true)) win++;
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	if (!FileMD5(sample_cat_win, false) && !FileMD5(sample_cat_dos, false))
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		fprintf(stderr, "Your sample.cat file is corrupted or missing!\n");
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	/*
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	 * forced DOS palette via command line -> leave it that way
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	 * all Windows files present -> Windows palette
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	 * all DOS files present -> DOS palette
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	 * no Windows files present and any DOS file present -> DOS palette
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	 * otherwise -> Windows palette
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	 */
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	if (_use_dos_palette) {
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		return;
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	} else if (win == 5) {
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		_use_dos_palette = false;
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	} else if (dos == 5 || (win == 0 && dos > 0)) {
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		_use_dos_palette = true;
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	} else {
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		_use_dos_palette = false;
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	}
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}
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static byte _sprite_page_to_load = 0xFF;
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static void LoadSpriteTables(void)
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{
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	uint load_index = 0;
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	uint i;
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	const FileList *files; // list of grf files to be loaded. Either Windows files or DOS files
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	files = _use_dos_palette? &files_dos : &files_win;
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	for (i = 0; files->basic[i].filename != NULL; i++) {
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		load_index += LoadGrfFile(files->basic[i].filename, load_index, i);
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	}
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	LoadGrfIndexed("openttd.grf", _openttd_grf_indexes, i++);
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	if (_sprite_page_to_load != 0) {
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		LoadGrfIndexed(
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			files->landscape[_sprite_page_to_load - 1].filename,
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			_landscape_spriteindexes[_sprite_page_to_load - 1],
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			i++
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		);
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	}
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	LoadGrfIndexed("trkfoundw.grf", _slopes_spriteindexes[_opt.landscape], i++);
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	load_index = SPR_AUTORAIL_BASE;
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	load_index += LoadGrfFile("autorail.grf", load_index, i++);
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	load_index = SPR_CANALS_BASE;
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	load_index += LoadGrfFile("canalsw.grf", load_index, i++);
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	load_index = SPR_OPENTTD_BASE + OPENTTD_SPRITES_COUNT + 1;
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	LoadNewGRF(load_index, i);
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}
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void GfxLoadSprites(void)
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{
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	// Need to reload the sprites only if the landscape changed
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	if (_sprite_page_to_load != _opt.landscape) {
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		_sprite_page_to_load = _opt.landscape;
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		// Sprite cache
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		DEBUG(spritecache, 1) ("Loading sprite set %d.", _sprite_page_to_load);
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		GfxInitSpriteMem();
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		LoadSpriteTables();
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		GfxInitPalettes();
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	}
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}