(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2008 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * 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; version 2 of the License

 *

 * 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

 *)

{$INCLUDE "options.inc"}

unit uMisc;

interface

{$IFDEF GLES11}

{$ELSE}

{$ENDIF}

var

procedure movecursor(dx, dy: Integer);

procedure OutError(Msg: String; isFatalError: boolean);

procedure TryDo(Assert: boolean; Msg: string; isFatal: boolean);

procedure SDLTry(Assert: boolean; isFatal: boolean);

procedure AdjustColor(var Color: Longword);

procedure SetKB(n: Longword);

procedure SendKB;

procedure SetLittle(var r: hwFloat);

procedure SendStat(sit: TStatInfoType; s: shortstring);

function  Str2PChar(const s: shortstring): PChar;

function  Surface2Tex(surf: PSDL_Surface; enableClamp: boolean): PTexture;

procedure FreeTexture(tex: PTexture);

function  toPowerOf2(i: Longword): Longword;

function  DecodeBase64(s: shortstring): shortstring;

function  doSurfaceConversion(tmpsurf: PSDL_Surface): PSDL_Surface;

function  endian(independent: LongWord): LongWord;

{$IFNDEF IPHONEOS}

procedure MakeScreenshot(s: shortstring);

{$ENDIF}

implementation

{$IFDEF DEBUGFILE}

{$ENDIF}

procedure movecursor(dx, dy: Integer);

var x, y: LongInt;

begin

if (dx = 0) and (dy = 0) then exit;

SDL_GetMouseState(@x, @y);

Inc(x, dx);

Inc(y, dy);

SDL_WarpMouse(x, y);

end;

function hwSign(r: hwFloat): LongInt;

begin

// yes, we have negative zero for a reason

if r.isNegative then hwSign:= -1 else hwSign:= 1

end;

function Min(a, b: LongInt): LongInt;

begin

if a < b then Min:= a else Min:= b

end;

function Max(a, b: LongInt): LongInt;

begin

if a > b then Max:= a else Max:= b

end;

procedure OutError(Msg: String; isFatalError: boolean);

begin

{$IFDEF DEBUGFILE}AddFileLog(Msg);{$ENDIF}

WriteLnToConsole(Msg);

if isFatalError then

   begin

   SendIPC('E' + GetLastConsoleLine);

   SDL_Quit;

   halt(1)

   end

end;

procedure TryDo(Assert: boolean; Msg: string; isFatal: boolean);

begin

if not Assert then OutError(Msg, isFatal)

end;

procedure SDLTry(Assert: boolean; isFatal: boolean);

begin

if not Assert then OutError(SDL_GetError, isFatal)

end;

procedure AdjustColor(var Color: Longword);

begin

Color:= SDL_MapRGB(PixelFormat, (Color shr 16) and $FF, (Color shr 8) and $FF, Color and $FF)

end;

function IntToStr(n: LongInt): shortstring;

begin

str(n, IntToStr)

end;

function FloatToStr(n: hwFloat): shortstring;

begin

FloatToStr:= cstr(n) + '_' + inttostr(Lo(n.QWordValue))

end;

procedure SetTextureParameters(enableClamp: Boolean);

begin

if enableClamp and not cReducedQuality then

    begin

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)

    end;

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)

end;

function DxDy2Angle(const _dY, _dX: hwFloat): GLfloat;

var dY, dX: Extended;

begin

dY:= _dY.QWordValue / $100000000;

if _dY.isNegative then dY:= - dY;

dX:= _dX.QWordValue / $100000000;

if _dX.isNegative then dX:= - dX;

DxDy2Angle:= arctan2(dY, dX) * 180 / pi

end;

function DxDy2Angle32(const _dY, _dX: hwFloat): LongInt;

const _16divPI: Extended = 16/pi;

var dY, dX: Extended;

begin

dY:= _dY.QWordValue / $100000000;

if _dY.isNegative then dY:= - dY;

dX:= _dX.QWordValue / $100000000;

if _dX.isNegative then dX:= - dX;

DxDy2Angle32:= trunc(arctan2(dY, dX) * _16divPI) and $1f

end;

function DxDy2AttackAngle(const _dY, _dX: hwFloat): LongInt;

const MaxAngleDivPI: Extended = cMaxAngle/pi;

var dY, dX: Extended;

begin

dY:= _dY.QWordValue / $100000000;

if _dY.isNegative then dY:= - dY;

dX:= _dX.QWordValue / $100000000;

if _dX.isNegative then dX:= - dX;

DxDy2AttackAngle:= trunc(arctan2(dY, dX) * MaxAngleDivPI)

end;

procedure SetKB(n: Longword);

begin

KBnum:= n

end;

procedure SendKB;

var s: shortstring;

begin

if KBnum <> 0 then

   begin

   s:= 'K' + inttostr(KBnum);

   SendIPCRaw(@s, Length(s) + 1)

   end

end;

procedure SetLittle(var r: hwFloat);

begin

r:= SignAs(cLittle, r)

end;

procedure SendStat(sit: TStatInfoType; s: shortstring);

const stc: array [TStatInfoType] of char = 'rDkKH';

var buf: shortstring;

begin

buf:= 'i' + stc[sit] + s;

SendIPCRaw(@buf[0], length(buf) + 1)

end;

function Str2PChar(const s: shortstring): PChar;

const CharArray: array[byte] of Char = '';

begin

CharArray:= s;

CharArray[Length(s)]:= #0;

Str2PChar:= @CharArray

end;

function isPowerOf2(i: Longword): boolean;

begin

if i = 0 then exit(true);

while (i and 1) = 0 do i:= i shr 1;

isPowerOf2:= (i = 1)

end;

function toPowerOf2(i: Longword): Longword;

begin

toPowerOf2:= 1;

while (toPowerOf2 < i) do toPowerOf2:= toPowerOf2 shl 1

end;

procedure ResetVertexArrays(texture: PTexture);

begin

with texture^ do

	begin

	vb[0].X:= 0;

	vb[0].Y:= 0;

	vb[1].X:= w;

	vb[1].Y:= 0;

	vb[2].X:= w;

	vb[2].Y:= h;

	vb[3].X:= 0;

	vb[3].Y:= h;

	tb[0].X:= 0;

	tb[0].Y:= 0;

	tb[1].X:= rx;

	tb[1].Y:= 0;

	tb[2].X:= rx;

	tb[2].Y:= ry;

	tb[3].X:= 0;

	tb[3].Y:= ry

	end;

end;

function NewTexture(width, height: Longword; buf: Pointer): PTexture;

begin

new(NewTexture);

NewTexture^.w:= width;

NewTexture^.h:= height;

NewTexture^.rx:= 1.0;

NewTexture^.ry:= 1.0;

ResetVertexArrays(NewTexture);

glGenTextures(1, @NewTexture^.id);

glBindTexture(GL_TEXTURE_2D, NewTexture^.id);

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, buf);

SetTextureParameters(true);

end;

function Surface2Tex(surf: PSDL_Surface; enableClamp: boolean): PTexture;

var tw, th, x, y: Longword;

    tmpp: pointer;

    fromP4, toP4: PLongWordArray;

begin

new(Surface2Tex);

Surface2Tex^.w:= surf^.w;

Surface2Tex^.h:= surf^.h;

if (surf^.format^.BytesPerPixel <> 4) then

begin

	TryDo(false, 'Surface2Tex failed, expecting 32 bit surface', true);

	Surface2Tex^.id:= 0;

	exit

end;

glGenTextures(1, @Surface2Tex^.id);

glBindTexture(GL_TEXTURE_2D, Surface2Tex^.id);

if SDL_MustLock(surf) then

	SDLTry(SDL_LockSurface(surf) >= 0, true);

if (not SupportNPOTT) and (not (isPowerOf2(Surf^.w) and isPowerOf2(Surf^.h))) then

begin

	tw:= toPowerOf2(Surf^.w);

	th:= toPowerOf2(Surf^.h);

	Surface2Tex^.rx:= Surf^.w / tw;

	Surface2Tex^.ry:= Surf^.h / th;

	GetMem(tmpp, tw * th * surf^.format^.BytesPerPixel);

		fromP4:= Surf^.pixels;

		toP4:= tmpp;

		for y:= 0 to Pred(Surf^.h) do

		begin

			for x:= 0 to Pred(Surf^.w) do toP4^[x]:= fromP4^[x];

			for x:= Surf^.w to Pred(tw) do toP4^[x]:= 0;

			toP4:= @(toP4^[tw]);

			fromP4:= @(fromP4^[Surf^.pitch div 4]);

		end;

		for y:= Surf^.h to Pred(th) do

		begin

			for x:= 0 to Pred(tw) do toP4^[x]:= 0;

			toP4:= @(toP4^[tw]);

		end;

	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tw, th, 0, GL_RGBA, GL_UNSIGNED_BYTE, tmpp);

	FreeMem(tmpp, tw * th * surf^.format^.BytesPerPixel)

end

else

begin

	Surface2Tex^.rx:= 1.0;

	Surface2Tex^.ry:= 1.0;

	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, surf^.w, surf^.h, 0, GL_RGBA, GL_UNSIGNED_BYTE, surf^.pixels);

end;

ResetVertexArrays(Surface2Tex);

if SDL_MustLock(surf) then

	SDL_UnlockSurface(surf);

SetTextureParameters(enableClamp);

end;

procedure FreeTexture(tex: PTexture);

begin

if tex <> nil then

	begin

	glDeleteTextures(1, @tex^.id);

	dispose(tex)

	end

end;

function DecodeBase64(s: shortstring): shortstring;

const table = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

var i, t, c: Longword;

begin

c:= 0;

for i:= 1 to Length(s) do

	begin

	t:= Pos(s[i], table);

	if s[i] = '=' then inc(c);

	if t > 0 then byte(s[i]):= t - 1 else byte(s[i]):= 0

	end;

i:= 1;

t:= 1;

while i <= length(s) do

	begin

	DecodeBase64[t    ]:= char((byte(s[i    ]) shl 2) or (byte(s[i + 1]) shr 4));

	DecodeBase64[t + 1]:= char((byte(s[i + 1]) shl 4) or (byte(s[i + 2]) shr 2));

	DecodeBase64[t + 2]:= char((byte(s[i + 2]) shl 6) or (byte(s[i + 3])      ));

	inc(t, 3);

	inc(i, 4)

	end;

if c < 3 then t:= t - c;

byte(DecodeBase64[0]):= t - 1

end;

{$IFNDEF IPHONEOS}

procedure MakeScreenshot(s: shortstring);

const head: array[0..8] of Word = (0, 2, 0, 0, 0, 0, 0, 0, 24);

var p: Pointer;

	size: Longword;

	f: file;

begin

playSound(sndShutter, false, nil);

head[6]:= cScreenWidth;

head[7]:= cScreenHeight;