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r_colorsubsampling.pas
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r_colorsubsampling.pas
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//------------------------------------------------------------------------------
//
// FPCDoom - Port of Doom to Free Pascal Compiler
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 2004-2007 by Jim Valavanis
// Copyright (C) 2017-2022 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.
//
//------------------------------------------------------------------------------
// E-Mail: jimmyvalavanis@yahoo.gr
// Site : https://sourceforge.net/projects/fpcdoom/
//------------------------------------------------------------------------------
{$I FPCDoom.inc}
unit r_colorsubsampling;
interface
uses
d_fpc;
var
colorsubsamplingmode: integer = 0;
//==============================================================================
// R_SubsamplingBuffer8
//
// Subsampling buffer - 8 bit
//
//==============================================================================
procedure R_SubsamplingBuffer8(const y: PInteger);
//==============================================================================
// R_SubsamplingBuffer32
//
// Subsampling buffer - 32 bit
//
//==============================================================================
procedure R_SubsamplingBuffer32(const y: PInteger);
//==============================================================================
//
// R_SubsamplingBuffer
//
//==============================================================================
procedure R_SubsamplingBuffer;
implementation
uses
r_draw,
r_main,
r_trans8,
r_render;
//==============================================================================
// R_SubsamplingBuffer8
//
// Subsampling buffer - 8 bit
//
//==============================================================================
procedure R_SubsamplingBuffer8(const y: PInteger);
var
i: integer;
pb: PByteArray;
pquant: PByteArray;
begin
pb := @((ylookup8[y^]^)[columnofs[0]]);
pquant := @subsampling8tables[colorsubsamplingmode];
for i := 0 to viewwidth - 1 do
pb[i] := pquant[pb[i]];
end;
//==============================================================================
//
// R_SubSample1
//
//==============================================================================
function R_SubSample1(const c: LongWord): LongWord;
var
r, g, b: LongWord;
begin
r := (c shr 16) and $ff;
g := (c shr 8) and $ff;
b := c and $ff;
r := (r shr 4) shl 4 + 8;
g := (g shr 4) shl 4 + 8;
b := (b shr 4) shl 4 + 8;
result := b + g shl 8 + r shl 16;
end;
//==============================================================================
//
// R_SubSample2
//
//==============================================================================
function R_SubSample2(const c: LongWord): LongWord;
var
r, g, b: LongWord;
begin
r := (c shr 16) and $ff;
g := (c shr 8) and $ff;
b := c and $ff;
r := (r shr 5) shl 5 + 16;
g := (g shr 5) shl 5 + 16;
b := (b shr 5) shl 5 + 16;
result := b + g shl 8 + r shl 16;
end;
//==============================================================================
//
// R_SubSample3
//
//==============================================================================
function R_SubSample3(const c: LongWord): LongWord;
var
r, g, b: LongWord;
begin
r := (c shr 16) and $ff;
g := (c shr 8) and $ff;
b := c and $ff;
r := (r shr 6) shl 6 + 32;
g := (g shr 6) shl 6 + 32;
b := (b shr 6) shl 6 + 32;
result := b + g shl 8 + r shl 16;
end;
//==============================================================================
//
// R_SubSample4
//
//==============================================================================
function R_SubSample4(const c: LongWord): LongWord;
var
r, g, b: LongWord;
begin
r := (c shr 16) and $ff;
g := (c shr 8) and $ff;
b := c and $ff;
r := (r div 85) * 85 + 42;
g := (g div 85) * 85 + 42;
b := (b div 85) * 85 + 42;
result := b + g shl 8 + r shl 16;
end;
type
subsamplecoloritemfunc_t = function (const c: LongWord): LongWord;
var
subsamplecoloritemfunc: subsamplecoloritemfunc_t;
//==============================================================================
// R_SubsamplingBuffer32
//
// Subsampling buffer - 32 bit
//
//==============================================================================
procedure R_SubsamplingBuffer32(const y: PInteger);
var
i: integer;
pl: PLongWordArray;
begin
pl := @((ylookup32[y^]^)[columnofs[0]]);
for i := 0 to viewwidth - 1 do
pl[i] := subsamplecoloritemfunc(pl[i]);
end;
//==============================================================================
//
// R_SubsamplingBuffer
//
//==============================================================================
procedure R_SubsamplingBuffer;
var
y: integer;
begin
colorsubsamplingmode := colorsubsamplingmode mod 5;
if colorsubsamplingmode = 0 then
exit;
// Determine function to use
case colorsubsamplingmode of
1: subsamplecoloritemfunc := @R_SubSample1;
2: subsamplecoloritemfunc := @R_SubSample2;
3: subsamplecoloritemfunc := @R_SubSample3;
4: subsamplecoloritemfunc := @R_SubSample4;
end;
for y := 0 to viewheight - 1 do
R_AddRenderTask(subsamplecolorfunc, RF_COLORSUBSAMPLING, @y);
end;
end.