(*
 * 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 uStore;
interface
uses sysutils, uConsts, uTeams, SDLh,
{$IFDEF GLES11}
	gles11,
{$ELSE}
	GL, GLext,
{$ENDIF}
uFloat;

procedure StoreInit;
procedure StoreLoad;
procedure StoreRelease;
procedure DrawSpriteFromRect(Sprite: TSprite; r: TSDL_Rect; X, Y, Height, Position: LongInt);
procedure DrawSprite (Sprite: TSprite; X, Y, Frame: LongInt);
procedure DrawSprite2(Sprite: TSprite; X, Y, FrameX, FrameY: LongInt);
procedure DrawSpriteClipped(Sprite: TSprite; X, Y, TopY, RightX, BottomY, LeftX: LongInt);
procedure DrawSurfSprite(X, Y, Height, Frame: LongInt; Source: PTexture);
procedure DrawTexture(X, Y: LongInt; Texture: PTexture);
procedure DrawTextureF(Texture: PTexture; Scale: GLfloat; X, Y, Frame, Dir, Frames: LongInt);
procedure DrawRotatedTextureF(Texture: PTexture; Scale, OffsetX, OffsetY: GLfloat; X, Y, Frame, Dir, Frames: LongInt; Angle: real);
procedure DrawRotated(Sprite: TSprite; X, Y, Dir: LongInt; Angle: real);
procedure DrawRotatedF(Sprite: TSprite; X, Y, Frame, Dir: LongInt; Angle: real);
procedure DrawRotatedTex(Tex: PTexture; hw, hh, X, Y, Dir: LongInt; Angle: real);
procedure DrawCentered(X, Top: LongInt; Source: PTexture);
procedure DrawFromRect(X, Y: LongInt; r: PSDL_Rect; SourceTexture: PTexture);
procedure DrawHedgehog(X, Y: LongInt; Dir: LongInt; Pos, Step: LongWord; Angle: real);
procedure DrawFillRect(r: TSDL_Rect);
function  RenderStringTex(s: string; Color: Longword; font: THWFont): PTexture;
function  RenderSpeechBubbleTex(s: string; SpeechType: Longword; font: THWFont): PTexture;
procedure flipSurface(Surface: PSDL_Surface; Vertical: Boolean);
//procedure rotateSurface(Surface: PSDL_Surface);
procedure copyRotatedSurface(src, dest: PSDL_Surface); // this is necessary since width/height are read only in SDL
procedure copyToXY(src, dest: PSDL_Surface; destX, destY: Integer);
procedure RenderHealth(var Hedgehog: THedgehog);
procedure AddProgress;
procedure FinishProgress;
function  LoadImage(const filename: string; imageFlags: Integer): PSDL_Surface;
procedure SetupOpenGL;
procedure SetScale(f: GLfloat);


var PixelFormat: PSDL_PixelFormat = nil;
 SDLPrimSurface: PSDL_Surface = nil;
   PauseTexture,
   SyncTexture,
   ConfirmTexture: PTexture;
   cScaleFactor: GLfloat = 2.0;
   SupportNPOTT: Boolean = false;

implementation
uses uMisc, uConsole, uLand, uLocale, uWorld;

type TGPUVendor = (gvUnknown, gvNVIDIA, gvATI, gvIntel);

var
    HHTexture: PTexture;
	MaxTextureSize: Integer;
	cGPUVendor: TGPUVendor;

procedure StoreInit;
begin
	cGPUVendor:= gvUnknown;
end;

procedure DrawRoundRect(rect: PSDL_Rect; BorderColor, FillColor: Longword; Surface: PSDL_Surface; Clear: boolean);
var r: TSDL_Rect;
begin
r:= rect^;
if Clear then SDL_FillRect(Surface, @r, 0);

BorderColor:= SDL_MapRGB(Surface^.format, BorderColor shr 16, BorderColor shr 8, BorderColor and $FF);
FillColor:= SDL_MapRGB(Surface^.format, FillColor shr 16, FillColor shr 8, FillColor and $FF);

r.y:= rect^.y + 1;
r.h:= rect^.h - 2;
SDL_FillRect(Surface, @r, BorderColor);
r.x:= rect^.x + 1;
r.w:= rect^.w - 2;
r.y:= rect^.y;
r.h:= rect^.h;
SDL_FillRect(Surface, @r, BorderColor);
r.x:= rect^.x + 2;
r.y:= rect^.y + 1;
r.w:= rect^.w - 4;
r.h:= rect^.h - 2;
SDL_FillRect(Surface, @r, FillColor);
r.x:= rect^.x + 1;
r.y:= rect^.y + 2;
r.w:= rect^.w - 2;
r.h:= rect^.h - 4;
SDL_FillRect(Surface, @r, FillColor)
end;

function WriteInRoundRect(Surface: PSDL_Surface; X, Y: LongInt; Color: LongWord; Font: THWFont; s: string): TSDL_Rect;
var w, h: LongInt;
    tmpsurf: PSDL_Surface;
    clr: TSDL_Color;
    Result: TSDL_Rect;
begin
TTF_SizeUTF8(Fontz[Font].Handle, Str2PChar(s), w, h);
Result.x:= X;
Result.y:= Y;
Result.w:= w + FontBorder * 2 + 4;
Result.h:= h + FontBorder * 2;
DrawRoundRect(@Result, cWhiteColor, cNearBlackColor, Surface, true);
clr.r:= Color shr 16;
clr.g:= (Color shr 8) and $FF;
clr.b:= Color and $FF;
tmpsurf:= TTF_RenderUTF8_Blended(Fontz[Font].Handle, Str2PChar(s), clr.value);
tmpsurf:= doSurfaceConversion(tmpsurf);
Result.x:= X + FontBorder + 2;
Result.y:= Y + FontBorder;
SDLTry(tmpsurf <> nil, true);
SDL_UpperBlit(tmpsurf, nil, Surface, @Result);
SDL_FreeSurface(tmpsurf);
Result.x:= X;
Result.y:= Y;
Result.w:= w + FontBorder * 2 + 4;
Result.h:= h + FontBorder * 2;
WriteInRoundRect:= Result
end;

procedure StoreLoad;
var s: string;

	procedure WriteNames(Font: THWFont);
	var t: LongInt;
		i: LongInt;
		r, rr: TSDL_Rect;
		drY: LongInt;
		texsurf: PSDL_Surface;
	begin
	r.x:= 0;
	r.y:= 0;
	drY:= - 4;
	for t:= 0 to Pred(TeamsCount) do
		with TeamsArray[t]^ do
		begin
		NameTagTex:= RenderStringTex(TeamName, Clan^.Color, Font);

		r.w:= cTeamHealthWidth + 5;
		r.h:= NameTagTex^.h;

		texsurf:= SDL_CreateRGBSurface(SDL_SWSURFACE, r.w, r.h, 32, RMask, GMask, BMask, AMask);
		TryDo(texsurf <> nil, errmsgCreateSurface, true);
		TryDo(SDL_SetColorKey(texsurf, SDL_SRCCOLORKEY, 0) = 0, errmsgTransparentSet, true);

		DrawRoundRect(@r, cWhiteColor, cNearBlackColor, texsurf, true);
		rr:= r;
		inc(rr.x, 2); dec(rr.w, 4); inc(rr.y, 2); dec(rr.h, 4);
		DrawRoundRect(@rr, Clan^.Color, Clan^.Color, texsurf, false);
		HealthTex:= Surface2Tex(texsurf, false);
		SDL_FreeSurface(texsurf);

		dec(drY, r.h + 2);
		DrawHealthY:= drY;
		for i:= 0 to 7 do
			with Hedgehogs[i] do
				if Gear <> nil then
					begin
					NameTagTex:= RenderStringTex(Name, Clan^.Color, fnt16);
					if Hat <> 'NoHat' then
						begin
						texsurf:= LoadImage(Pathz[ptHats] + '/' + Hat, ifNone);
						if texsurf <> nil then
							begin
							HatTex:= Surface2Tex(texsurf, true);
							SDL_FreeSurface(texsurf)
							end
						end
					end;
		end;
	end;

	procedure MakeCrossHairs;
	var t: LongInt;
		tmpsurf, texsurf: PSDL_Surface;
		Color, i: Longword;
	begin
	s:= Pathz[ptGraphics] + '/' + cCHFileName;
	tmpsurf:= LoadImage(s, ifAlpha or ifCritical);

	for t:= 0 to Pred(TeamsCount) do
		with TeamsArray[t]^ do
		begin
		texsurf:= SDL_CreateRGBSurface(SDL_SWSURFACE, tmpsurf^.w, tmpsurf^.h, 32, RMask, GMask, BMask, AMask);
		TryDo(texsurf <> nil, errmsgCreateSurface, true);

		Color:= Clan^.Color;
		Color:= SDL_MapRGB(texsurf^.format, Color shr 16, Color shr 8, Color and $FF);
		SDL_FillRect(texsurf, nil, Color);

		SDL_UpperBlit(tmpsurf, nil, texsurf, nil);

		TryDo(tmpsurf^.format^.BytesPerPixel = 4, 'Ooops', true);

		if SDL_MustLock(texsurf) then
			SDLTry(SDL_LockSurface(texsurf) >= 0, true);

		// make black pixel be alpha-transparent
		for i:= 0 to texsurf^.w * texsurf^.h - 1 do
			if PLongwordArray(texsurf^.pixels)^[i] = AMask then PLongwordArray(texsurf^.pixels)^[i]:= 0;

		if SDL_MustLock(texsurf) then
			SDL_UnlockSurface(texsurf);

		CrosshairTex:= Surface2Tex(texsurf, false);
		SDL_FreeSurface(texsurf)
		end;

	SDL_FreeSurface(tmpsurf)
	end;

	procedure InitHealth;
	var i, t: LongInt;
	begin
	for t:= 0 to Pred(TeamsCount) do
		if TeamsArray[t] <> nil then
			with TeamsArray[t]^ do
				begin
				for i:= 0 to cMaxHHIndex do
					if Hedgehogs[i].Gear <> nil then
						RenderHealth(Hedgehogs[i]);
				end
	end;

	procedure LoadGraves;
	var t: LongInt;
		texsurf: PSDL_Surface;
	begin
	for t:= 0 to Pred(TeamsCount) do
	if TeamsArray[t] <> nil then
		with TeamsArray[t]^ do
			begin
			if GraveName = '' then GraveName:= 'Simple';
			texsurf:= LoadImage(Pathz[ptGraves] + '/' + GraveName, ifCritical or ifTransparent);
			GraveTex:= Surface2Tex(texsurf, false);
			SDL_FreeSurface(texsurf)
			end
	end;

var ii: TSprite;
    fi: THWFont;
    ai: TAmmoType;
    tmpsurf: PSDL_Surface;
    i: LongInt;
{$IFDEF IPHONEOS}
tmpP: PLongWordArray;
tmpA, tmpR, tmpG, tmpB: LongWord;
{$ENDIF}
begin

for fi:= Low(THWFont) to High(THWFont) do
	with Fontz[fi] do
		begin
		s:= Pathz[ptFonts] + '/' + Name;
		WriteToConsole(msgLoading + s + '... ');
		Handle:= TTF_OpenFont(Str2PChar(s), Height);
		SDLTry(Handle <> nil, true);
		TTF_SetFontStyle(Handle, style);
		WriteLnToConsole(msgOK)
		end;

WriteNames(fnt16);
MakeCrossHairs;
LoadGraves;

AddProgress;
for ii:= Low(TSprite) to High(TSprite) do
	with SpritesData[ii] do
        // FIXME - add a sprite attribute
        if (not cReducedQuality) or (not (ii in [sprSky, sprSkyL, sprSkyR, sprHorizont, sprHorizontL, sprHorizontR, sprFlake])) then // FIXME: hack
		begin
			if AltPath = ptNone then
				if ii in [sprHorizontL, sprHorizontR, sprSkyL, sprSkyR] then // FIXME: hack
					tmpsurf:= LoadImage(Pathz[Path] + '/' + FileName, ifAlpha or ifTransparent or ifLowRes)
				else
					tmpsurf:= LoadImage(Pathz[Path] + '/' + FileName, ifAlpha or ifTransparent or ifCritical or ifLowRes)
			else begin
				tmpsurf:= LoadImage(Pathz[Path] + '/' + FileName, ifAlpha or ifTransparent);
				if tmpsurf = nil then
					tmpsurf:= LoadImage(Pathz[AltPath] + '/' + FileName, ifAlpha or ifCritical or ifTransparent);
				end;

			if tmpsurf <> nil then
				begin
{$IFDEF IPHONEOS}   
{* http://bugzilla.libsdl.org/show_bug.cgi?id=868 but patched library doesn't work on ipod, so implementing workaround here *}
				if (ifAlpha or ifTransparent) > 0 then
				begin
					tmpP := tmpsurf^.pixels;
					for i:= 0 to (tmpsurf^.pitch shr 2) * tmpsurf^.h - 1 do 
					begin
{$IFDEF ENDIAN_LITTLE}
						tmpA:= tmpP^[i] shr 24 and $FF;
						tmpR:= tmpP^[i] shr 16 and $FF;
						tmpG:= tmpP^[i] shr 8 and $FF;
						tmpB:= tmpP^[i] and $FF;
{$ELSE}
						tmpA:= tmpP^[i] and $FF;
						tmpR:= tmpP^[i] shr 8 and $FF;
						tmpG:= tmpP^[i] shr 16 and $FF;
						tmpB:= tmpP^[i] shr 24 and $FF;
{$ENDIF}
						if tmpA <> 0 then
						begin
							tmpR:= round(tmpR * 255 / tmpA);
							tmpG:= round(tmpG * 255 / tmpA);
							tmpB:= round(tmpB * 255 / tmpA);
						end;

						if tmpR > 255 then tmpR:= 255;
						if tmpG > 255 then tmpG:= 255;
						if tmpB > 255 then tmpB:= 255;

{$IFDEF ENDIAN_LITTLE}
						tmpP^[i]:= (tmpA shl 24) or (tmpR shl 16) or (tmpG shl 8) or tmpB;
{$ELSE}
						tmpP^[i]:= (tmpA) or (tmpR shl 8) or (tmpG shl 16) or (tmpB shl 24);
{$ENDIF}
					end;
				end;
{$ENDIF}
				
				if imageWidth = 0 then imageWidth:= tmpsurf^.w;
				if imageHeight = 0 then imageHeight:= tmpsurf^.h;
				if Width = 0 then Width:= tmpsurf^.w;
				if Height = 0 then Height:= tmpsurf^.h;
				if (ii in [sprSky, sprSkyL, sprSkyR, sprHorizont, sprHorizontL, sprHorizontR]) then
					Texture:= Surface2Tex(tmpsurf, true)
				else
					begin
					Texture:= Surface2Tex(tmpsurf, false);
					if (ii = sprWater) and not cReducedQuality then // HACK: We should include some sprite attribute to define the texture wrap directions
						begin
					(*	REMOVE ME WHEN BUG ABOVE IS FIXED
						tmpP := tmpsurf^.pixels; 
						for i:= 0 to (tmpsurf^.pitch shr 2) * tmpsurf^.h - 1 do
						begin
							tmpA:= tmpP^[i] shr 24 and $FF;
							tmpR:= tmpP^[i] shr 16 and $FF;
							tmpG:= tmpP^[i] shr 8 and $FF;
							tmpB:= tmpP^[i] and $FF;
						
							writeln(stdout, inttostr(tmpA) + ' | ' + inttostr(tmpR) + ' | ' + inttostr(tmpG)+ ' | ' + inttostr(tmpB));
						end;
					*)
						glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
						end;
					end;
				if saveSurf then Surface:= tmpsurf else SDL_FreeSurface(tmpsurf)
				end
			else
				Surface:= nil
		end;

AddProgress;

tmpsurf:= LoadImage(Pathz[ptGraphics] + '/' + cHHFileName, ifAlpha or ifCritical or ifTransparent);
HHTexture:= Surface2Tex(tmpsurf, false);
SDL_FreeSurface(tmpsurf);

InitHealth;

PauseTexture:= RenderStringTex(trmsg[sidPaused], cYellowColor, fntBig);
ConfirmTexture:= RenderStringTex(trmsg[sidConfirm], cYellowColor, fntBig);
SyncTexture:= RenderStringTex(trmsg[sidSync], cYellowColor, fntBig);

AddProgress;

for ai:= Low(TAmmoType) to High(TAmmoType) do
	with Ammoz[ai] do
		begin
		tmpsurf:= TTF_RenderUTF8_Blended(Fontz[fnt16].Handle, Str2PChar(trAmmo[NameId]), cWhiteColor);
		tmpsurf:= doSurfaceConversion(tmpsurf);
		NameTex:= Surface2Tex(tmpsurf, false);
		SDL_FreeSurface(tmpsurf)
		end;

for i:= Low(CountTexz) to High(CountTexz) do
	begin
	tmpsurf:= TTF_RenderUTF8_Blended(Fontz[fnt16].Handle, Str2PChar(IntToStr(i) + 'x'), cWhiteColor);
	tmpsurf:= doSurfaceConversion(tmpsurf);	
	CountTexz[i]:= Surface2Tex(tmpsurf, false);
	SDL_FreeSurface(tmpsurf)
	end;

{$IFDEF DUMP}
//not working anymore, where are LandSurface and StoreSurface defined?
//SDL_SaveBMP_RW(LandSurface, SDL_RWFromFile('LandSurface.bmp', 'wb'), 1);
//SDL_SaveBMP_RW(StoreSurface, SDL_RWFromFile('StoreSurface.bmp', 'wb'), 1);
{$ENDIF}
AddProgress;
end;

procedure DrawFromRect(X, Y: LongInt; r: PSDL_Rect; SourceTexture: PTexture);
var rr: TSDL_Rect;
    _l, _r, _t, _b: real;
    VertexBuffer, TextureBuffer: array [0..3] of TVertex2f;
begin
if (SourceTexture^.h = 0) or (SourceTexture^.w = 0) then exit;
rr.x:= X;
rr.y:= Y;
rr.w:= r^.w;
rr.h:= r^.h;

_l:= r^.x / SourceTexture^.w * SourceTexture^.rx;
_r:= (r^.x + r^.w) / SourceTexture^.w * SourceTexture^.rx;
_t:= r^.y / SourceTexture^.h * SourceTexture^.ry;
_b:= (r^.y + r^.h) / SourceTexture^.h * SourceTexture^.ry;

glBindTexture(GL_TEXTURE_2D, SourceTexture^.id);

VertexBuffer[0].X:= X;
VertexBuffer[0].Y:= Y;
VertexBuffer[1].X:= rr.w + X;
VertexBuffer[1].Y:= Y;
VertexBuffer[2].X:= rr.w + X;
VertexBuffer[2].Y:= rr.h + Y;
VertexBuffer[3].X:= X;
VertexBuffer[3].Y:= rr.h + Y;

TextureBuffer[0].X:= _l;
TextureBuffer[0].Y:= _t;
TextureBuffer[1].X:= _r;
TextureBuffer[1].Y:= _t;
TextureBuffer[2].X:= _r;
TextureBuffer[2].Y:= _b;
TextureBuffer[3].X:= _l;
TextureBuffer[3].Y:= _b;

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

glVertexPointer(2, GL_FLOAT, 0, @VertexBuffer[0]);
glTexCoordPointer(2, GL_FLOAT, 0, @TextureBuffer[0]);
glDrawArrays(GL_TRIANGLE_FAN, 0, Length(VertexBuffer));

glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY)
end;

procedure DrawTexture(X, Y: LongInt; Texture: PTexture);
begin
glPushMatrix;
glTranslatef(X, Y, 0);

glBindTexture(GL_TEXTURE_2D, Texture^.id);

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

glVertexPointer(2, GL_FLOAT, 0, @Texture^.vb);
glTexCoordPointer(2, GL_FLOAT, 0, @Texture^.tb);
glDrawArrays(GL_TRIANGLE_FAN, 0, Length(Texture^.vb));

glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);

glPopMatrix
end;

procedure DrawTextureF(Texture: PTexture; Scale: GLfloat; X, Y, Frame, Dir, Frames: LongInt);
var ft, fb: GLfloat;
	hw: LongInt;
    VertexBuffer, TextureBuffer: array [0..3] of TVertex2f;
begin
glPushMatrix;
glTranslatef(X, Y, 0);
glScalef(Scale, Scale, 1.0);

if Dir < 0 then
	hw:= - 16
else
	hw:= 16;

ft:= Frame / Frames * Texture^.ry;
fb:= (Frame + 1) / Frames * Texture^.ry;

glBindTexture(GL_TEXTURE_2D, Texture^.id);

VertexBuffer[0].X:= -hw;
VertexBuffer[0].Y:= -16;
VertexBuffer[1].X:= hw;
VertexBuffer[1].Y:= -16;
VertexBuffer[2].X:= hw;
VertexBuffer[2].Y:= 16;
VertexBuffer[3].X:= -hw;
VertexBuffer[3].Y:= 16;

TextureBuffer[0].X:= 0;
TextureBuffer[0].Y:= ft;
TextureBuffer[1].X:= Texture^.rx;
TextureBuffer[1].Y:= ft;
TextureBuffer[2].X:= Texture^.rx;
TextureBuffer[2].Y:= fb;
TextureBuffer[3].X:= 0;
TextureBuffer[3].Y:= fb;

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

glVertexPointer(2, GL_FLOAT, 0, @VertexBuffer[0]);
glTexCoordPointer(2, GL_FLOAT, 0, @TextureBuffer[0]);
glDrawArrays(GL_TRIANGLE_FAN, 0, Length(VertexBuffer));

glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);


glPopMatrix
end;

procedure DrawRotatedTextureF(Texture: PTexture; Scale, OffsetX, OffsetY: GLfloat; X, Y, Frame, Dir, Frames: LongInt; Angle: real);
var ft, fb: GLfloat;
	hw: LongInt;
    VertexBuffer, TextureBuffer: array [0..3] of TVertex2f;
begin
glPushMatrix;
glTranslatef(X, Y, 0);

if Dir < 0 then
   glRotatef(Angle, 0, 0, -1)
else
   glRotatef(Angle, 0, 0,  1);

glTranslatef(Dir*OffsetX, OffsetY, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

if Dir < 0 then
	hw:= - 16
else
	hw:= 16;

ft:= Frame / Frames * Texture^.ry;
fb:= (Frame + 1) / Frames * Texture^.ry;

glBindTexture(GL_TEXTURE_2D, Texture^.id);

VertexBuffer[0].X:= -hw;
VertexBuffer[0].Y:= -16;
VertexBuffer[1].X:= hw;
VertexBuffer[1].Y:= -16;
VertexBuffer[2].X:= hw;
VertexBuffer[2].Y:= 16;
VertexBuffer[3].X:= -hw;
VertexBuffer[3].Y:= 16;

TextureBuffer[0].X:= 0;
TextureBuffer[0].Y:= ft;
TextureBuffer[1].X:= Texture^.rx;
TextureBuffer[1].Y:= ft;
TextureBuffer[2].X:= Texture^.rx;
TextureBuffer[2].Y:= fb;
TextureBuffer[3].X:= 0;
TextureBuffer[3].Y:= fb;

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

glVertexPointer(2, GL_FLOAT, 0, @VertexBuffer[0]);
glTexCoordPointer(2, GL_FLOAT, 0, @TextureBuffer[0]);
glDrawArrays(GL_TRIANGLE_FAN, 0, Length(VertexBuffer));

glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);


glPopMatrix
end;

procedure DrawRotated(Sprite: TSprite; X, Y, Dir: LongInt; Angle: real);
begin
DrawRotatedTex(SpritesData[Sprite].Texture,
		SpritesData[Sprite].Width,
		SpritesData[Sprite].Height,
		X, Y, Dir, Angle)
end;

procedure DrawRotatedF(Sprite: TSprite; X, Y, Frame, Dir: LongInt; Angle: real);
begin
glPushMatrix;
glTranslatef(X, Y, 0);

if Dir < 0 then
   glRotatef(Angle, 0, 0, -1)
else
   glRotatef(Angle, 0, 0,  1);
if Dir < 0 then glScalef(-1.0, 1.0, 1.0);

DrawSprite(Sprite, -SpritesData[Sprite].Width div 2, -SpritesData[Sprite].Height div 2, Frame);

glPopMatrix
end;

procedure DrawRotatedTex(Tex: PTexture; hw, hh, X, Y, Dir: LongInt; Angle: real);
var VertexBuffer: array [0..3] of TVertex2f;
begin
glPushMatrix;
glTranslatef(X, Y, 0);

if Dir < 0 then
   begin
   hw:= - hw;
   glRotatef(Angle, 0, 0, -1);
   end else
   glRotatef(Angle, 0, 0,  1);


glBindTexture(GL_TEXTURE_2D, Tex^.id);

VertexBuffer[0].X:= -hw;
VertexBuffer[0].Y:= -hh;
VertexBuffer[1].X:= hw;
VertexBuffer[1].Y:= -hh;
VertexBuffer[2].X:= hw;
VertexBuffer[2].Y:= hh;
VertexBuffer[3].X:= -hw;
VertexBuffer[3].Y:= hh;

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

glVertexPointer(2, GL_FLOAT, 0, @VertexBuffer[0]);
glTexCoordPointer(2, GL_FLOAT, 0, @Tex^.tb);
glDrawArrays(GL_TRIANGLE_FAN, 0, Length(VertexBuffer));

glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);

glPopMatrix
end;

procedure DrawSpriteFromRect(Sprite: TSprite; r: TSDL_Rect; X, Y, Height, Position: LongInt);
begin
r.y:= r.y + Height * Position;
r.h:= Height;
DrawFromRect(X, Y, @r, SpritesData[Sprite].Texture)
end;

procedure DrawSprite (Sprite: TSprite; X, Y, Frame: LongInt);
var row, col, numFramesFirstCol: LongInt;
begin
numFramesFirstCol:= SpritesData[Sprite].imageHeight div SpritesData[Sprite].Height;
row:= Frame mod numFramesFirstCol;
col:= Frame div numFramesFirstCol;
DrawSprite2 (Sprite, X, Y, col, row);
end;

procedure DrawSpriteClipped(Sprite: TSprite; X, Y, TopY, RightX, BottomY, LeftX: LongInt);
var r: TSDL_Rect;
begin
r.x:= 0;
r.y:= 0;
r.w:= SpritesData[Sprite].Width;
r.h:= SpritesData[Sprite].Height;

if (X < LeftX) then
    r.x:= LeftX - X;
if (Y < TopY) then
    r.y:= TopY - Y;

if (Y + SpritesData[Sprite].Height > BottomY) then
    r.h:= BottomY - Y + 1;
if (X + SpritesData[Sprite].Width > RightX) then
    r.w:= RightX - X + 1;

dec(r.h, r.y);
dec(r.w, r.x);

DrawFromRect(X + r.x, Y + r.y, @r, SpritesData[Sprite].Texture)
end;

procedure DrawSprite2(Sprite: TSprite; X, Y, FrameX, FrameY: LongInt);
var r: TSDL_Rect;
begin
r.x:= FrameX * SpritesData[Sprite].Width;
r.w:= SpritesData[Sprite].Width;
r.y:= FrameY * SpritesData[Sprite].Height;
r.h:= SpritesData[Sprite].Height;
DrawFromRect(X, Y, @r, SpritesData[Sprite].Texture)
end;

procedure DrawSurfSprite(X, Y, Height, Frame: LongInt; Source: PTexture);
var r: TSDL_Rect;
begin
r.x:= 0;
r.w:= Source^.w;
r.y:= Frame * Height;
r.h:= Height;
DrawFromRect(X, Y, @r, Source)
end;

procedure DrawCentered(X, Top: LongInt; Source: PTexture);
begin
DrawTexture(X - Source^.w shr 1, Top, Source)
end;

procedure DrawHedgehog(X, Y: LongInt; Dir: LongInt; Pos, Step: LongWord; Angle: real);
const VertexBuffer: array [0..3] of TVertex2f = (
		(x: -16; y: -16),
		(x:  16; y: -16),
		(x:  16; y:  16),
		(x: -16; y:  16));
var l, r, t, b: real;
    TextureBuffer: array [0..3] of TVertex2f;
begin

t:= Pos * 32 / HHTexture^.h;
b:= (Pos + 1) * 32 / HHTexture^.h;

if Dir = -1 then
   begin
   l:= (Step + 1) * 32 / HHTexture^.w;
   r:= Step * 32 / HHTexture^.w
   end else
   begin
   l:= Step * 32 / HHTexture^.w;
   r:= (Step + 1) * 32 / HHTexture^.w
   end;


glPushMatrix();
glTranslatef(X, Y, 0);
glRotatef(Angle, 0, 0, 1);

glBindTexture(GL_TEXTURE_2D, HHTexture^.id);

TextureBuffer[0].X:= l;
TextureBuffer[0].Y:= t;
TextureBuffer[1].X:= r;
TextureBuffer[1].Y:= t;
TextureBuffer[2].X:= r;
TextureBuffer[2].Y:= b;
TextureBuffer[3].X:= l;
TextureBuffer[3].Y:= b;

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

glVertexPointer(2, GL_FLOAT, 0, @VertexBuffer[0]);
glTexCoordPointer(2, GL_FLOAT, 0, @TextureBuffer[0]);
glDrawArrays(GL_TRIANGLE_FAN, 0, Length(VertexBuffer));

glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);


glColor4f(1,1,1,1);

glPopMatrix
end;

procedure DrawFillRect(r: TSDL_Rect);
var VertexBuffer: array [0..3] of TVertex2f;
begin
glDisable(GL_TEXTURE_2D);

glColor4ub(0, 0, 0, 127);

VertexBuffer[0].X:= r.x;
VertexBuffer[0].Y:= r.y;
VertexBuffer[1].X:= r.x + r.w;
VertexBuffer[1].Y:= r.y;
VertexBuffer[2].X:= r.x + r.w;
VertexBuffer[2].Y:= r.y + r.h;
VertexBuffer[3].X:= r.x;
VertexBuffer[3].Y:= r.y + r.h;

glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, @VertexBuffer[0]);
glDrawArrays(GL_TRIANGLE_FAN, 0, Length(VertexBuffer));
glDisableClientState(GL_VERTEX_ARRAY);

glColor4f(1, 1, 1, 1);
glEnable(GL_TEXTURE_2D)
end;

procedure StoreRelease;
var ii: TSprite;
begin
for ii:= Low(TSprite) to High(TSprite) do
    begin
    FreeTexture(SpritesData[ii].Texture);
    if SpritesData[ii].Surface <> nil then SDL_FreeSurface(SpritesData[ii].Surface)
    end;

FreeTexture(HHTexture)
end;

function  RenderStringTex(s: string; Color: Longword; font: THWFont): PTexture;
var w, h: LongInt;
    Result: PSDL_Surface;
begin
if length(s) = 0 then s:= ' ';
TTF_SizeUTF8(Fontz[font].Handle, Str2PChar(s), w, h);

Result:= SDL_CreateRGBSurface(SDL_SWSURFACE, w + FontBorder * 2 + 4, h + FontBorder * 2,
         32, RMask, GMask, BMask, AMask);

TryDo(Result <> nil, 'RenderString: fail to create surface', true);

WriteInRoundRect(Result, 0, 0, Color, font, s);

TryDo(SDL_SetColorKey(Result, SDL_SRCCOLORKEY, 0) = 0, errmsgTransparentSet, true);

RenderStringTex:= Surface2Tex(Result, false);

SDL_FreeSurface(Result)
end;

function RenderSpeechBubbleTex(s: string; SpeechType: Longword; font: THWFont): PTexture;
var textWidth, textHeight, x, y, w, h, i, j, pos, prevpos, line, numLines, edgeWidth, edgeHeight, cornerWidth, cornerHeight: LongInt;
    Result, tmpsurf, rotatedEdge: PSDL_Surface;
    rect: TSDL_Rect;
    chars: TSysCharSet = [#9,' ','.',';',':','?','!',','];
    substr: shortstring;
    edge, corner, tail: TSPrite;
begin

case SpeechType of
    1: begin;
       edge:= sprSpeechEdge;
       corner:= sprSpeechCorner;
       tail:= sprSpeechTail;
       end;
    2: begin;
       edge:= sprThoughtEdge;
       corner:= sprThoughtCorner;
       tail:= sprThoughtTail;
       end;
    3: begin;
       edge:= sprShoutEdge;
       corner:= sprShoutCorner;
       tail:= sprShoutTail;
       end;
    end;
edgeHeight:= SpritesData[edge].Height;
edgeWidth:= SpritesData[edge].Width;
cornerWidth:= SpritesData[corner].Width;
cornerHeight:= SpritesData[corner].Height;
// This one screws up WrapText
//s:= 'This is the song that never ends.  ''cause it goes on and on my friends. Some people, started singing it not knowing what it was. And they''ll just go on singing it forever just because... This is the song that never ends...';
// This one does not
//s:= 'This is the song that never ends.  cause it goes on and on my friends. Some people, started singing it not knowing what it was. And they will go on singing it forever just because... This is the song that never ends... ';

numLines:= 0;

if length(s) = 0 then s:= '...';
TTF_SizeUTF8(Fontz[font].Handle, Str2PChar(s), w, h);
if w<8 then w:= 8;
j:= 0;
if (length(s) > 20) then
    begin
    w:= 0;
    i:= round(Sqrt(length(s)) * 2);
    s:= WrapText(s, #1, chars, i);
    pos:= 1; prevpos:= 0; line:= 0;
// Find the longest line for the purposes of centring the text.  Font dependant.
    while pos <= length(s) do
        begin
        if (s[pos] = #1) or (pos = length(s)) then
            begin
            inc(numlines);
            if s[pos] <> #1 then inc(pos);
            while s[prevpos+1] = ' ' do inc(prevpos);
            substr:= copy(s, prevpos+1, pos-prevpos-1);
            i:= 0; j:= 0;
            TTF_SizeUTF8(Fontz[font].Handle, Str2PChar(substr), i, j);
            if i > w then w:= i;
            prevpos:= pos;
            end;
        inc(pos);
        end;
    end
else numLines := 1;

textWidth:=((w-(cornerWidth-edgeWidth)*2) div edgeWidth)*edgeWidth+edgeWidth;
textHeight:=(((numlines * h + 2)-((cornerHeight-edgeWidth)*2)) div edgeWidth)*edgeWidth;

textHeight:=max(textHeight,edgeWidth);
//textWidth:=max(textWidth,SpritesData[tail].Width);
rect.x:= 0;
rect.y:= 0;
rect.w:= textWidth + (cornerWidth * 2);
rect.h:= textHeight + cornerHeight*2 - edgeHeight + SpritesData[tail].Height;
//s:= inttostr(w) + ' ' + inttostr(numlines) + ' ' + inttostr(rect.x) + ' '+inttostr(rect.y) + ' ' + inttostr(rect.w) + ' ' + inttostr(rect.h);

Result:= SDL_CreateRGBSurface(SDL_SWSURFACE, rect.w, rect.h, 32, RMask, GMask, BMask, AMask);

TryDo(Result <> nil, 'RenderString: fail to create surface', true);

//////////////////////////////// CORNERS ///////////////////////////////
copyToXY(SpritesData[corner].Surface, Result, 0, 0); /////////////////// NW

flipSurface(SpritesData[corner].Surface, true); // store all 4 versions in memory to avoid repeated flips?
x:= 0;
y:= textHeight + cornerHeight -1;
copyToXY(SpritesData[corner].Surface, Result, x, y); /////////////////// SW

flipSurface(SpritesData[corner].Surface, false);
x:= rect.w-cornerWidth-1;
y:= textHeight + cornerHeight -1;
copyToXY(SpritesData[corner].Surface, Result, x, y); /////////////////// SE

flipSurface(SpritesData[corner].Surface, true);
x:= rect.w-cornerWidth-1;
y:= 0;
copyToXY(SpritesData[corner].Surface, Result, x, y); /////////////////// NE
flipSurface(SpritesData[corner].Surface, false); // restore original position
//////////////////////////////// END CORNERS ///////////////////////////////

//////////////////////////////// EDGES //////////////////////////////////////
x:= cornerWidth;
y:= 0;
while x < rect.w-cornerWidth-1 do
    begin
    copyToXY(SpritesData[edge].Surface, Result, x, y); ///////////////// top edge
    inc(x,edgeWidth);
    end;
flipSurface(SpritesData[edge].Surface, true);
x:= cornerWidth;
y:= textHeight + cornerHeight*2 - edgeHeight-1;
while x < rect.w-cornerWidth-1 do
    begin
    copyToXY(SpritesData[edge].Surface, Result, x, y); ///////////////// bottom edge
    inc(x,edgeWidth);
    end;
flipSurface(SpritesData[edge].Surface, true); // restore original position

rotatedEdge:= SDL_CreateRGBSurface(SDL_SWSURFACE, edgeHeight, edgeWidth, 32, RMask, GMask, BMask, AMask);
x:= rect.w - edgeHeight - 1;
y:= cornerHeight;
//// initially was going to rotate in place, but the SDL spec claims width/height are read only
copyRotatedSurface(SpritesData[edge].Surface,rotatedEdge);
while y < textHeight + cornerHeight do
    begin
    copyToXY(rotatedEdge, Result, x, y);
    inc(y,edgeWidth);
    end;
flipSurface(rotatedEdge, false); // restore original position
x:= 0;
y:= cornerHeight;
while y < textHeight + cornerHeight do
    begin
    copyToXY(rotatedEdge, Result, x, y);
    inc(y,edgeWidth);
    end;
//////////////////////////////// END EDGES //////////////////////////////////////

x:= cornerWidth;
y:= textHeight + cornerHeight * 2 - edgeHeight - 1;
copyToXY(SpritesData[tail].Surface, Result, x, y);

rect.x:= edgeHeight;
rect.y:= edgeHeight;
rect.w:= rect.w - edgeHeight * 2;
rect.h:= textHeight + cornerHeight * 2 - edgeHeight * 2;
i:= rect.w;
j:= rect.h;
SDL_FillRect(Result, @rect, cWhiteColor);

pos:= 1; prevpos:= 0; line:= 0;
while pos <= length(s) do
    begin
    if (s[pos] = #1) or (pos = length(s)) then
        begin
        if s[pos] <> #1 then inc(pos);
        while s[prevpos+1] = ' 'do inc(prevpos);
        substr:= copy(s, prevpos+1, pos-prevpos-1);
        if Length(substr) <> 0 then
           begin
           tmpsurf:= TTF_RenderUTF8_Blended(Fontz[Font].Handle, Str2PChar(substr), 
{$IFDEF ENDIAN_LITTLE}
		cNearBlackColor
{$ELSE}
		$100000FF
{$ENDIF}
		); // do not remove me
	   tmpsurf:= doSurfaceConversion(tmpsurf);
           rect.x:= edgeHeight + 1 + ((i - w) div 2);
           // trying to more evenly position the text, vertically
           rect.y:= edgeHeight + ((j-(numLines*h)) div 2) + line * h;
           SDLTry(tmpsurf <> nil, true);
           SDL_UpperBlit(tmpsurf, nil, Result, @rect);
           SDL_FreeSurface(tmpsurf);
           inc(line);
           prevpos:= pos;
           end;
        end;
    inc(pos);
    end;

//TryDo(SDL_SetColorKey(Result, SDL_SRCCOLORKEY, 0) = 0, errmsgTransparentSet, true);
RenderSpeechBubbleTex:= Surface2Tex(Result, true);

SDL_FreeSurface(rotatedEdge);
SDL_FreeSurface(Result)
end;

procedure RenderHealth(var Hedgehog: THedgehog);
var s: shortstring;
begin
str(Hedgehog.Gear^.Health, s);
if Hedgehog.HealthTagTex <> nil then FreeTexture(Hedgehog.HealthTagTex);
Hedgehog.HealthTagTex:= RenderStringTex(s, Hedgehog.Team^.Clan^.Color, fnt16)
end;

function  LoadImage(const filename: string; imageFlags: Integer): PSDL_Surface;
var tmpsurf: PSDL_Surface;
    s: shortstring;
begin
WriteToConsole(msgLoading + filename + '... ');

s:= filename + '.png';
tmpsurf:= IMG_Load(Str2PChar(s));

if ((imageFlags and ifLowRes) <> 0) then
	begin
		s:= filename + '-lowres.png';
		if (tmpsurf <> nil) then
		begin
			if ((tmpsurf^.w > MaxTextureSize) or (tmpsurf^.h > MaxTextureSize)) then
			begin
				SDL_FreeSurface(tmpsurf);
				WriteLnToConsole('Image too big, trying to load lowres version: ' + s);
				tmpsurf:= IMG_Load(Str2PChar(s))
			end;
		end
		else
		begin
			WriteLnToConsole('Image not found, trying to load lowres version: ' + s);
			tmpsurf:= IMG_Load(Str2PChar(s))
		end;
	end;

if tmpsurf = nil then
	begin
	OutError(msgFailed, (imageFlags and ifCritical) <> 0);
	exit(nil)
	end;

if ((imageFlags and ifIgnoreCaps) = 0) and ((tmpsurf^.w > MaxTextureSize) or (tmpsurf^.h > MaxTextureSize)) then
	begin
		SDL_FreeSurface(tmpsurf);
		OutError(msgFailedSize, (imageFlags and ifCritical) <> 0);
		//dummy surface to replace non-critical textures that failed to load due to their size
		exit(SDL_CreateRGBSurface(SDL_SWSURFACE, 32, 32, 32, RMask, GMask, BMask, AMask));
	end;

tmpsurf:= doSurfaceConversion(tmpsurf);

if (imageFlags and ifTransparent) <> 0 then TryDo(SDL_SetColorKey(tmpsurf, SDL_SRCCOLORKEY, 0) = 0, errmsgTransparentSet, true);
//if (imageFlags and ifAlpha) <> 0 then Result:= SDL_DisplayFormatAlpha(tmpsurf) else Result:= SDL_DisplayFormat(tmpsurf);
WriteLnToConsole('(' + inttostr(tmpsurf^.w) + ',' + inttostr(tmpsurf^.h) + ') ');
WriteLnToConsole(msgOK);

LoadImage:= tmpsurf //Result
end;

function glLoadExtension(extension : string) : boolean;
begin
{$IFDEF IPHONEOS}
	glLoadExtension:= false;
{$ELSE}
	glLoadExtension:= glext_LoadExtension(extension);
{$ENDIF}
{$IFDEF DEBUGFILE}
	if not glLoadExtension then
		AddFileLog('OpenGL - "' + extension + '" failed to load')
	else
		AddFileLog('OpenGL - "' + extension + '" loaded');
{$ENDIF}
end;

procedure SetupOpenGL;
var vendor: shortstring;
begin
glGetIntegerv(GL_MAX_TEXTURE_SIZE, @MaxTextureSize);

{$IFDEF DEBUGFILE}
AddFileLog('OpenGL - Renderer: ' + string(pchar(glGetString(GL_RENDERER))));
AddFileLog('OpenGL - Vendor: ' + string(pchar(glGetString(GL_VENDOR))));
AddFileLog('OpenGL - Version: ' + string(pchar(glGetString(GL_VERSION))));
AddFileLog('OpenGL - GL_MAX_TEXTURE_SIZE: ' + inttostr(MaxTextureSize));
{$ENDIF}

if MaxTextureSize = 0 then
	begin
	MaxTextureSize:= 1024;
{$IFDEF DEBUGFILE}
	AddFileLog('OpenGL Warning - driver didn''t provide any valid max texture size; assuming 1024');
{$ENDIF}
	end;

vendor:= LowerCase(string(pchar(glGetString(GL_VENDOR))));
if StrPos(Str2PChar(vendor), Str2PChar('nvidia')) <> nil then
	cGPUVendor:= gvNVIDIA
else if StrPos(Str2PChar(vendor), Str2PChar('intel')) <> nil then
	cGPUVendor:= gvATI
else if StrPos(Str2PChar(vendor), Str2PChar('ati')) <> nil then
	cGPUVendor:= gvIntel;

	
{$IFNDEF IPHONEOS}
// since ATI seems to be unable to provide proper texture filtering/quality,
// do not even try to load the extension on ATI cards

{$IFDEF DARWIN}
if true then
{$ELSE}
if cGPUVendor <> gvATI then
{$ENDIF}
	SupportNPOTT:= glLoadExtension('GL_ARB_texture_non_power_of_two')
{$IFDEF DEBUGFILE}
else
	AddFileLog('OpenGL: Skipped extension GL_ARB_texture_non_power_of_two due to ATI card')
{$ENDIF}
; // do not touch this line! :)
{$ENDIF}

// set view port to whole window
glViewport(0, 0, cScreenWidth, cScreenHeight);

glMatrixMode(GL_MODELVIEW);
// prepare default translation/scaling
glLoadIdentity;
glScalef(2.0 / cScreenWidth, -2.0 / cScreenHeight, 1.0);
glTranslatef(0, -cScreenHeight / 2, 0);

// enable alpha blending
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
end;

procedure SetScale(f: GLfloat);
begin
// leave immediately if scale factor did not change
if f = cScaleFactor then exit;

if f = 2.0 then // default scaling
	glPopMatrix // "return" to default scaling
else // other scaling
	begin
	glPushMatrix; // save default scaling
	glLoadIdentity;
	glScalef(f / cScreenWidth, -f / cScreenHeight, 1.0);
	glTranslatef(0, -cScreenHeight / 2, 0);
	end;

cScaleFactor:= f;
end;

////////////////////////////////////////////////////////////////////////////////
var ProgrTex: PTexture = nil;
    Step: integer = 0;
	squaresize : LongInt;
	numsquares : integer;

procedure AddProgress;
var r: TSDL_Rect;
    texsurf: PSDL_Surface;
begin
if Step = 0 then
   begin
   WriteToConsole(msgLoading + 'progress sprite: ');
   texsurf:= LoadImage(Pathz[ptGraphics] + '/Progress', ifCritical or ifTransparent);
   ProgrTex:= Surface2Tex(texsurf, false);
   SDL_FreeSurface(texsurf);
   squaresize:= ProgrTex^.w shr 1;
   numsquares:= ProgrTex^.h div squaresize;
   end;

TryDo(ProgrTex <> nil, 'ProgrTex = nil!', true);

glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
if Step < numsquares then r.x:= 0
else r.x:= squaresize;
r.y:= (Step mod numsquares) * squaresize;
r.w:= squaresize;
r.h:= squaresize;
DrawFromRect( -squaresize div 2, (cScreenHeight - squaresize) shr 1, @r, ProgrTex);
glDisable(GL_TEXTURE_2D);
SDL_GL_SwapBuffers();
inc(Step);
end;


procedure FinishProgress;
begin
WriteLnToConsole('Freeing progress surface... ');
FreeTexture(ProgrTex);
ProgrTex:= nil
end;

procedure flipSurface(Surface: PSDL_Surface; Vertical: Boolean);
var y, x, i, j: LongInt;
    tmpPixel: Longword;
    pixels: PLongWordArray;
begin
TryDo(Surface^.format^.BytesPerPixel = 4, 'flipSurface failed, expecting 32 bit surface', true);
pixels:= Surface^.pixels;
if Vertical then
   for y := 0 to (Surface^.h div 2) - 1 do
       for x := 0 to Surface^.w - 1 do
           begin
           i:= y * Surface^.w + x;
           j:= (Surface^.h - y - 1) * Surface^.w + x;
           tmpPixel:= pixels^[i];
           pixels^[i]:= pixels^[j];
           pixels^[j]:= tmpPixel;
           end
else
   for x := 0 to (Surface^.w div 2) - 1 do
       for y := 0 to Surface^.h -1 do
           begin
           i:= y*Surface^.w + x;
           j:= y*Surface^.w + (Surface^.w - x - 1);
           tmpPixel:= pixels^[i];
           pixels^[i]:= pixels^[j];
           pixels^[j]:= tmpPixel;
           end;
end;

procedure copyToXY(src, dest: PSDL_Surface; destX, destY: Integer);
var srcX, srcY, i, j, maxDest: LongInt;
    srcPixels, destPixels: PLongWordArray;
begin
maxDest:= (dest^.pitch div 4) * dest^.h;
srcPixels:= src^.pixels;
destPixels:= dest^.pixels;

for srcX:= 0 to src^.w - 1 do
   for srcY:= 0 to src^.h - 1 do
      begin
      i:= (destY + srcY) * (dest^.pitch div 4) + destX + srcX;
      j:= srcY * (src^.pitch div 4) + srcX;
      // basic skip of transparent pixels - cleverness would be to do true alpha
      if (i < maxDest) and (AMask and srcPixels^[j] <> 0) then destPixels^[i]:= srcPixels^[j];
      end;
end;

procedure copyRotatedSurface(src, dest: PSDL_Surface); // this is necessary since width/height are read only in SDL, apparently
var y, x, i, j: LongInt;
    srcPixels, destPixels: PLongWordArray;
begin
TryDo(src^.format^.BytesPerPixel = 4, 'rotateSurface failed, expecting 32 bit surface', true);
TryDo(dest^.format^.BytesPerPixel = 4, 'rotateSurface failed, expecting 32 bit surface', true);

srcPixels:= src^.pixels;
destPixels:= dest^.pixels;

j:= 0;
for x := 0 to src^.w - 1 do
    for y := 0 to src^.h - 1 do
        begin
        i:= (src^.h - 1 - y) * (src^.pitch div 4) + x;
        destPixels^[j]:= srcPixels^[i];
        inc(j)
        end;
end;

end.