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r_plane.pas
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r_plane.pas
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//------------------------------------------------------------------------------
//
// DoomXS - A basic Windows source port of Doom
// based on original Linux Doom as published by "id Software"
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 2021-2022 by Jim Valavanis
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
//------------------------------------------------------------------------------
// Site: https://sourceforge.net/projects/doomxs/
//------------------------------------------------------------------------------
unit r_plane;
interface
uses
m_fixed,
doomdef,
r_data,
r_defs;
procedure R_ClearPlanes;
procedure R_MapPlane(y: integer; x1: integer; x2: integer);
procedure R_MakeSpans(x: integer; t1: integer; b1: integer; t2: integer; b2: integer);
procedure R_DrawPlanes;
function R_FindPlane(height: fixed_t; picnum: integer; lightlevel: integer): Pvisplane_t;
function R_CheckPlane(pl: Pvisplane_t; start: integer; stop: integer): Pvisplane_t;
var
//
// Clip values are the solid pixel bounding the range.
// floorclip starts out SCREENHEIGHT
// ceilingclip starts out -1
//
floorclip: packed array[0..SCREENWIDTH - 1] of smallint;
ceilingclip: packed array[0..SCREENWIDTH - 1] of smallint;
var
floorplane: Pvisplane_t;
ceilingplane: Pvisplane_t;
const
MAXOPENINGS = SCREENWIDTH * SCREENHEIGHT; //https://www.doomworld.com/vb/source-ports/85967-reasonable-static-limit-for-maxopenings/
var
openings: packed array[0..MAXOPENINGS - 1] of smallint;
lastopening: integer;
yslope: array[0..SCREENHEIGHT - 1] of fixed_t;
distscale: array[0..SCREENWIDTH - 1] of fixed_t;
implementation
uses
d_delphi,
tables,
i_system,
r_sky,
r_draw,
r_main,
r_things,
z_memory,
w_wad;
// Here comes the obnoxious "visplane".
const
MAXVISPLANES = 256; // JVAL was = 128
var
visplanes: array[0..MAXVISPLANES - 1] of visplane_t;
lastvisplane: integer;
// spanstart holds the start of a plane span
// initialized to 0 at start
spanstart: array[0..SCREENHEIGHT - 1] of integer;
// texture mapping
planezlight: Plighttable_tPArray;
planeheight: fixed_t;
basexscale: fixed_t;
baseyscale: fixed_t;
//
// R_MapPlane
//
// Uses global vars:
// planeheight
// ds_source
// basexscale
// baseyscale
// viewx
// viewy
//
// BASIC PRIMITIVE
//
procedure R_MapPlane(y: integer; x1: integer; x2: integer);
var
angle: angle_t;
distance: fixed_t;
len: fixed_t;
index: LongWord;
slope: Double;
begin
slope := (planeheight / abs(centery - y)) * planerelativeaspect;
distance := FixedMul(planeheight, yslope[y]);
ds_xstep := Round(viewsin * slope / FRACUNIT);
ds_ystep := Round(viewcos * slope / FRACUNIT);
len := FixedMul(distance, distscale[x1]);
angle := (viewangle + xtoviewangle[x1]) shr ANGLETOFINESHIFT;
ds_xfrac := viewx + FixedMul(finecosine[angle], len);
ds_yfrac := -viewy - FixedMul(finesine[angle], len);
if fixedcolormap <> nil then
ds_colormap := fixedcolormap
else
begin
index := _SHR(distance, LIGHTZSHIFT);
if index >= MAXLIGHTZ then
index := MAXLIGHTZ - 1;
ds_colormap := planezlight[index];
end;
ds_y := y;
ds_x1 := x1;
ds_x2 := x2;
// high or low detail
spanfunc;
end;
// R_ClearPlanes
// At begining of frame.
procedure R_ClearPlanes;
var
i: integer;
angle: angle_t;
begin
// opening / clipping determination
for i := 0 to viewwidth - 1 do
begin
floorclip[i] := viewheight;
ceilingclip[i] := -1;
end;
lastvisplane := 0;
lastopening := 0;
// left to right mapping
angle := (viewangle - ANG90) shr ANGLETOFINESHIFT;
// scale will be unit scale at SCREENWIDTH/2 distance
basexscale := FixedDiv(finecosine[angle], centerxfrac);
baseyscale := -FixedDiv(finesine[angle], centerxfrac);
end;
// R_NewVisPlane
function R_NewVisPlane: integer;
begin
if lastvisplane = MAXVISPLANES then
I_Error('R_NewVisPlane(): no more visplanes');
if lastvisplane > maxvisplane then
begin
visplanes[lastvisplane].top :=
Z_Malloc((SCREENWIDTH + 2) * SizeOf(visindex_t), PU_LEVEL, nil);
visplanes[lastvisplane].bottom :=
Z_Malloc((SCREENWIDTH + 2) * SizeOf(visindex_t), PU_LEVEL, nil);
maxvisplane := lastvisplane;
end;
inc(lastvisplane);
Result := lastvisplane;
end;
// R_FindPlane
function R_FindPlane(height: fixed_t; picnum: integer; lightlevel: integer): Pvisplane_t;
var
check: integer;
i: integer;
begin
if picnum = skyflatnum then
begin
height := 0; // all skys map together
lightlevel := 0;
end;
check := 0;
while check < lastvisplane do
begin
if (height = visplanes[check].height) and
(picnum = visplanes[check].picnum) and
(lightlevel = visplanes[check].lightlevel) then
Break;
inc(check);
end;
if check < lastvisplane then
begin
Result := @visplanes[check];
Exit;
end;
if lastvisplane = MAXVISPLANES then
I_Error('R_FindPlane(): no more visplanes');
lastvisplane := R_NewVisPlane;
Result := @visplanes[check];
Result.height := height;
Result.picnum := picnum;
Result.lightlevel := lightlevel;
Result.minx := SCREENWIDTH;
Result.maxx := -1;
for i := 0 to SCREENWIDTH - 1 do
Result.top[i] := VISEND;
end;
// R_CheckPlane
function R_CheckPlane(pl: Pvisplane_t; start: integer; stop: integer): Pvisplane_t;
var
intrl: integer;
intrh: integer;
unionl: integer;
unionh: integer;
x: integer;
i: integer;
begin
if start < pl.minx then
begin
intrl := pl.minx;
unionl := start;
end
else
begin
unionl := pl.minx;
intrl := start;
end;
if stop > pl.maxx then
begin
intrh := pl.maxx;
unionh := stop;
end
else
begin
unionh := pl.maxx;
intrh := stop;
end;
x := intrl;
while x <= intrh do
begin
if pl.top[x] <> VISEND then
Break
else
inc(x);
end;
if x > intrh then
begin
pl.minx := unionl;
pl.maxx := unionh;
// use the same one
Result := pl;
Exit;
end;
// make a new visplane
if lastvisplane = MAXVISPLANES then
I_Error('R_CheckPlane(): no more visplanes');
Result := @visplanes[lastvisplane];
Result.height := pl.height;
Result.picnum := pl.picnum;
Result.lightlevel := pl.lightlevel;
lastvisplane := R_NewVisPlane;
Result.minx := start;
Result.maxx := stop;
for i := 0 to SCREENWIDTH - 1 do
Result.top[i] := VISEND;
end;
// R_MakeSpans
procedure R_MakeSpans(x: integer; t1: integer; b1: integer; t2: integer; b2: integer);
begin
while (t1 < t2) and (t1 <= b1) do
begin
if (t1 >= 0) and (t1 < viewheight) then
R_MapPlane(t1, spanstart[t1], x - 1);
inc(t1);
end;
while (b1 > b2) and (b1 >= t1) do
begin
if (b1 >= 0) and (b1 < viewheight) then
R_MapPlane(b1, spanstart[b1], x - 1);
dec(b1);
end;
while (t2 < t1) and (t2 <= b2) do
begin
if (t2 >= 0) and (t2 < viewheight) then
spanstart[t2] := x;
inc(t2);
end;
while (b2 > b1) and (b2 >= t2) do
begin
if (b2 >= 0) and (b2 < viewheight) then
spanstart[b2] := x;
dec(b2);
end;
end;
// R_DrawPlanes
// At the end of each frame.
procedure R_DrawPlanes;
var
pl: Pvisplane_t;
i: integer;
light: integer;
x: integer;
stop: integer;
angle: integer;
begin
for i := 0 to lastvisplane - 1 do
begin
pl := @visplanes[i];
if pl.minx > pl.maxx then
Continue;
// sky flat
if pl.picnum = skyflatnum then
begin
dc_iscale := pspriteiscale;
// Sky is allways drawn full bright,
// i.e. colormaps[0] is used.
// Because of this hack, sky is not affected
// by INVUL inverse mapping.
dc_colormap := colormaps;
dc_texturemid := skytexturemid;
for x := pl.minx to pl.maxx do
begin
dc_yl := pl.top[x];
dc_yh := pl.bottom[x];
if dc_yl <= dc_yh then
begin
angle := _SHR(viewangle + xtoviewangle[x], ANGLETOSKYSHIFT);
dc_x := x;
dc_source := R_GetColumn(skytexture, angle);
// JVAL: call skycolfunc(), not colfunc()
skycolfunc;
end;
end;
Continue;
end;
// regular flat
ds_source := W_CacheLumpNum(firstflat + flattranslation[pl.picnum], PU_STATIC);
planeheight := abs(pl.height - viewz);
light := _SHR(pl.lightlevel, LIGHTSEGSHIFT) + extralight;
if light >= LIGHTLEVELS then
light := LIGHTLEVELS - 1
else if light < 0 then
light := 0;
planezlight := @zlight[light];
pl.top[pl.maxx + 1] := VISEND;
pl.top[pl.minx - 1] := VISEND;
stop := pl.maxx + 1;
for x := pl.minx to stop do
R_MakeSpans(x, pl.top[x - 1], pl.bottom[x - 1], pl.top[x], pl.bottom[x]);
Z_ChangeTag(ds_source, PU_CACHE);
end;
end;
end.