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(*
gba_fade.pas 18/06/2006 4.19.14
------------------------------------------------------------------------------
Part of this file is a raw porting of libgba library for gba (you can find it
at http://www.devkitpro.org).
As this is a direct port from c, I'm pretty sure that something could not work
as you expect. I am even more sure that this code could be written better, so
if you think that I have made some mistakes or you have some better
implemented functions, let me know [francky74 (at) gmail (dot) com]
Enjoy!
Conversion by Legolas (http://itaprogaming.free.fr) for freepascal compiler
(http://www.freepascal.org)
Copyright (C) 2006 Francesco Lombardi
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
------------------------------------------------------------------------------
*)
unit gba_fade;
{$i def.inc}
interface
uses
gba_types, gba_regs, gba_video, gba_core;
var
CurrentPalette: array [0..511] of word;
FadeTable: array [0..(512*3*2)-1] of smallint;
procedure GetCurrentPalette();
procedure SetPalette(Palette: pword);
procedure DoFade(FadeCount: dword);
procedure FadeToGrayScale(FrameCount: dword);
procedure FadeToPalette(const NewPalette: pword; FrameCount: dword);
procedure FadeToGray(gray: word; FrameCount: dword);
implementation
procedure GetCurrentPalette();
var
i: dword;
Src: ^word;
Dest: ^word;
begin
Src := BG_COLORS;
Dest := CurrentPalette;
for i := 0 to 511 do
Dest[i] := dword(Src[i]);
end;
procedure SetPalette(Palette: pword);
var
i: dword;
Src, Dest: ^word;
begin
Src := Palette;
Dest := BG_COLORS;
for i := 0 to 511 do
Dest[i] := dword(Src[i]);
end;
procedure DoFade(FadeCount: dword);
var
r, g, b: word;
i, count, color: dword;
src: ^smallint;
dest: ^word;
begin
for count := 0 to FadeCount - 1 do
begin
src := FadeTable;
dest := CurrentPalette;
i := 0;
while i < 512 do
begin
r := Src[(i*6)+1];
r := r + Src[(i*6)];
Src[(i*6)+1] := r;
g := Src[(i*6)+3];
g := g + Src[(i*6)+2];
Src[(i*6)+3] := g;
b := Src[(i*6)+5];
b := b + Src[(i*6)+4];
Src[(i*6)+5] := b;
color := (r shr 8) or ((g shr 8) shl 5) or ((b shr 8) shl 10);
Dest[i] := color;
inc(i);
end;
WaitForVBlank();
SetPalette(CurrentPalette);
end;
end;
procedure FadeToGray(gray: word; FrameCount: dword);
var
index, r, g, b, color: dword;
src: ^word;
table: ^smallint;
begin
GetCurrentPalette();
src := CurrentPalette;
for index :=0 to 511 do
begin
color := src[index];
r := (color and $1f) shl 8;
g := ((color shr 5) and $1f) shl 8;
b := ((color shr 10) and $1f) shl 8;
FadeTable[(index*6)] := ((gray shl 8)-r) div FrameCount;
FadeTable[(index*6)+1] := r;
FadeTable[(index*6)+2] := ((gray shl 8)-g) div FrameCount;
FadeTable[(index*6)+3] := g;
FadeTable[(index*6)+4] := ((gray shl 8)-b) div FrameCount;
FadeTable[(index*6)+5] := b;
end;
DoFade( FrameCount);
end;
procedure FadeToPalette(const NewPalette: pword; FrameCount: dword);
var
index: dword;
color: word;
r1, r2, g1, g2, b1, b2: smallint;
Src: ^word;
Dest: ^word;
Table: ^smallint;
begin
GetCurrentPalette();
Src := CurrentPalette;
Dest := NewPalette;
Table := FadeTable;
for index := 0 to 511 do
begin
color := Src[index];
r1 := (color and $1f) shl 8;
g1 := ((color shr 5) and $1f) shl 8;
b1 := ((color shr 10) and $1f) shl 8;
color := Dest[index];
r2 := (color and $1f) shl 8;
g2 := ((color shr 5) and $1f) shl 8;
b2 := ((color shr 10) and $1f) shl 8;
Table[(index*6)] := (r2 - r1) div FrameCount;
Table[(index*6)+1] := r1;
Table[(index*6)+2] := (g2 - g1) div FrameCount;
Table[(index*6)+3] := g1;
Table[(index*6)+4] := (b2 - b1) div FrameCount;
Table[(index*6)+5] := b1;
end;
DoFade(FrameCount);
end;
procedure FadeToGrayScale(FrameCount: dword);
var
index: dword;
gray: word;
r,g,b: smallint;
Src: ^word;
Dest: ^word;
Table: ^smallint;
GrayScalePalette: array [0..511] of word;
begin
GetCurrentPalette();
Src := CurrentPalette;
Table := FadeTable;
for index := 0 to 511 do
begin
r := (Src[index] and $1f);
g := ((Src[index] shr 5) and $1f);
b := ((Src[index] shr 10) and $1f);
Gray := (r shr 2) + (r shr 4) + (g shr 1) + (g shr 4) + (b shr 3);
GrayScalePalette[index] := RGB(gray, gray, gray);
end;
FadeToPalette(GrayScalePalette, FrameCount);
end;
end.
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