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readmap.m
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readmap.m
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% MAP=READMAP(FILENAME [, CONVERTINDICES]) Read BUILD map file.
%
% CONVERTINDICES specifies whether some fields which represent indices
% should be corrected for MATLAB's one-based indexing (that is, have a 1 added)
% If omitted, it defaults to true.
function [map,err]=readmap(filename, convertindices)
argout_havemap = (nargout>0);
argout_haveerr = (nargout>1);
if (nargin<2)
convertindices=true;
end
SIZEOF_SECT = 40;
SIZEOF_WALL = 32;
SIZEOF_SPRI = 44;
err = 0;
map = struct();
if (ischar(filename))
readfmt = '*uint8';
fid = fopen(filename);
if (fid<0)
err = 1;
if (~argout_haveerr)
error(sprintf('Couldn''t open file `%s''.', filename));
end
return
end
data = fread(fid, Inf, '*uint8').'; % data: row vector
fclose(fid);
elseif(strcmp(class(filename), 'uint8'))
data = filename(:).';
else
error('First argument must be either file name (char) of data (uint8).');
end
if (length(data) < 22)
err = 2;
if (~argout_haveerr)
error('File shorter than header length.');
end
return
end
map.mapversion = getint4(data(1:4));
map.posx = getint4(data(5:8));
map.posy = getint4(data(9:12));
map.posz = getint4(data(13:16));
map.ang = getint2(data(17:18));
map.cursectnum = getint2(data(19:20));
convfunc = struct('int8',@getint1, 'uint8',@(x)(x.'), ...
'int16',@getint2, 'uint16',@getuint2, ...
'int32',@getint4, 'uint32',@getuint4);
bytecnt = struct('int8',1, 'uint8',1, 'int16',2, 'uint16',2, 'int32',4, 'uint32',4);
% SECTORS
map.numsectors = getint2(data(21:22));
b = 22;
B = b;
numsectors = double(map.numsectors);
sec = struct( ...
'wallptr', zeros(1, 1, 'int16'), ...
'wallnum', zeros(1, 1, 'int16'), ...
'ceilingz', zeros(1, 1, 'int32'), ...
'floorz', zeros(1, 1, 'int32'), ...
'ceilingstat', zeros(1, 1, 'uint16'), ... % instead of int16
'floorstat', zeros(1, 1, 'uint16'), ... % instead of int16
'ceilingpicnum', zeros(1, 1, 'int16'), ...
'ceilingheinum', zeros(1, 1, 'int16'), ...
'ceilingshade', zeros(1, 1, 'int8' ), ...
'ceilingpal', zeros(1, 1, 'uint8'), ...
'ceilingxpanning', zeros(1, 1, 'uint8'), ...
'ceilingypanning', zeros(1, 1, 'uint8'), ...
'floorpicnum', zeros(1, 1, 'int16'), ...
'floorheinum', zeros(1, 1, 'int16'), ...
'floorshade', zeros(1, 1, 'int8'), ...
'floorpal', zeros(1, 1, 'uint8'), ...
'floorxpanning', zeros(1, 1, 'uint8'), ...
'floorypanning', zeros(1, 1, 'uint8'), ...
'visibility', zeros(1, 1, 'uint8'), ...
'filler', zeros(1, 1, 'uint8'), ...
'lotag', zeros(1, 1, 'int16'), ...
'hitag', zeros(1, 1, 'int16'), ...
'extra', zeros(1, 1, 'int16'));
fn = fieldnames(sec);
numfn = length(fn);
for j=1:numfn
daclass = class(sec(1).(fn{j}));
funct = convfunc.(daclass);
numbytes = bytecnt.(daclass);
% idx matrix: (numsectors, numbytes)
sec.(fn{j}) = funct(data(...
b + repmat(1:numbytes, numsectors, 1) + repmat(((0:numsectors-1).').*SIZEOF_SECT, 1, numbytes) ));
b = b+numbytes;
end
b = B + SIZEOF_SECT*numsectors;
B = b;
if convertindices
sec.wallptr = sec.wallptr+1;
end
map.sector = sec;
% WALLS
map.numwalls = getint2(data(b+1:b+2));
b = b+2;
numwalls = double(map.numwalls);
wal = struct( ...
'x', zeros(1, 1, 'int32'), ...
'y', zeros(1, 1, 'int32'), ...
'point2', zeros(1, 1, 'int16'), ...
'nextwall', zeros(1, 1, 'int16'), ...
'nextsector', zeros(1, 1, 'int16'), ...
'cstat', zeros(1, 1, 'uint16'), ... % instead of int16
'picnum', zeros(1, 1, 'int16'), ...
'overpicnum', zeros(1, 1, 'int16'), ...
'shade', zeros(1, 1, 'int8' ), ...
'pal', zeros(1, 1, 'uint8'), ...
'xrepeat', zeros(1, 1, 'uint8'), ...
'yrepeat', zeros(1, 1, 'uint8'), ...
'xpanning', zeros(1, 1, 'uint8'), ...
'ypanning', zeros(1, 1, 'uint8'), ...
'lotag', zeros(1, 1, 'int16'), ...
'hitag', zeros(1, 1, 'int16'), ...
'extra', zeros(1, 1, 'int16'));
fn = fieldnames(wal);
numfn = length(fn);
for j=1:numfn
daclass = class(wal(1).(fn{j}));
funct = convfunc.(daclass);
numbytes = bytecnt.(daclass);
% idx matrix: (numwalls, numbytes)
wal.(fn{j}) = funct(data(...
b + repmat(1:numbytes, numwalls, 1) + repmat(((0:numwalls-1).').*SIZEOF_WALL, 1, numbytes) ));
b = b+numbytes;
end
b = B + 2 + SIZEOF_WALL*numwalls;
B = b;
if convertindices
wal.point2 = wal.point2 + 1;
wal.nextwall = wal.nextwall + 1;
wal.nextsector = wal.nextsector + 1;
end
map.wall = wal;
% SPRITES
map.numsprites = getint2(data(b+1:b+2));
b = b+2;
numsprites = double(map.numsprites);
spr = struct( ...
'x', zeros(1, 1, 'int32'), ...
'y', zeros(1, 1, 'int32'), ...
'z', zeros(1, 1, 'int32'), ...
'cstat', zeros(1, 1, 'uint16'), ... % instead of int16
'picnum', zeros(1, 1, 'int16'), ...
'shade', zeros(1, 1, 'int8'), ...
'pal', zeros(1, 1, 'uint8'), ...
'clipdist', zeros(1, 1, 'uint8'), ...
'filler', zeros(1, 1, 'uint8'), ...
'xrepeat', zeros(1, 1, 'uint8'), ...
'yrepeat', zeros(1, 1, 'uint8'), ...
'xoffset', zeros(1, 1, 'int8' ), ...
'yoffset', zeros(1, 1, 'int8' ), ...
'sectnum', zeros(1, 1, 'int16'), ...
'statnum', zeros(1, 1, 'int16'), ...
'ang', zeros(1, 1, 'int16'), ...
'owner', zeros(1, 1, 'int16'), ...
'xvel', zeros(1, 1, 'int16'), ...
'yvel', zeros(1, 1, 'int16'), ...
'zvel', zeros(1, 1, 'int16'), ...
'lotag', zeros(1, 1, 'int16'), ...
'hitag', zeros(1, 1, 'int16'), ...
'extra', zeros(1, 1, 'int16'));
fn = fieldnames(spr);
numfn = length(fn);
for j=1:numfn
daclass = class(spr(1).(fn{j}));
funct = convfunc.(daclass);
numbytes = bytecnt.(daclass);
% idx matrix: (numsprites, numbytes)
spr.(fn{j}) = funct(data(...
b + repmat(1:numbytes, numsprites, 1) + repmat(((0:numsprites-1).').*SIZEOF_SPRI, 1, numbytes) ));
b = b+numbytes;
end
if convertindices
spr.sectnum = spr.sectnum + 1;
end
map.sprite = spr;
end % function readmap
% Byte array -> integer conversion
% The first byte is the least significant one (little endian).
function i=getuint4(bytes)
i = sum(bitshift(uint32(bytes), repmat([0 8 16 24], size(bytes,1), 1)), 2, 'native');
end
function i=getint4(bytes)
i = sum(bitshift(uint32(bytes), repmat([0 8 16 24], size(bytes,1), 1)), 2, 'native');
i = typecast(i, 'int32');
end
function i=getuint2(bytes)
i = sum(bitshift(uint16(bytes), repmat([0 8], size(bytes,1), 1)), 2, 'native');
end
function i=getint2(bytes)
i = sum(bitshift(uint16(bytes), repmat([0 8], size(bytes,1), 1)), 2, 'native');
i = typecast(i, 'int16');
end
function i=getint1(byte)
i = typecast(byte, 'int8').'; % col vec
end