path: root/Game/Code/Classes/ULyrics.pas

unit ULyrics;

interface

{$IFDEF FPC}
  {$MODE Delphi}
{$ENDIF}

{$I switches.inc}

uses
  gl,
  glext,
  UTexture,
  UThemes,
  UMusic;

type
  TLyricWord = record
    X:          Real;     // left corner
    Width:      Real;     // width
    Start:      Cardinal; // start of the word in quarters (beats)
    Length:     Cardinal; // length of the word in quarters
    Text:       String;   // text
    Freestyle:  Boolean;  // is freestyle?
  end;
  ALyricWord = array of TLyricWord;

  TLyricLine = class
    public
      Text:           String;       // text
      Tex:            glUInt;       // texture of the text
      Width:          Real;         // width
      Size:           Byte;         // fontsize
      Words:          ALyricWord;   // words in this line
      CurWord:        Integer;      // current active word idx (only valid if line is active)
      Start:          Cardinal;     // start of this line in quarters
      Length:         Cardinal;     // length in quarters
      HasFreestyle:   Boolean;      // one or more word are freestyle?
      CountFreestyle: Integer;      // how often there is a change from freestyle to non freestyle in this line
      Players:        Byte;         // players that should sing that line (bitset, Player1: 1, Player2: 2, Player3: 4)
      Done:           Boolean;      // is sentence already sung?
      LastLine:       Boolean;      // is this the last line ob the song?
  end;

  TLyricEngine = class
    private
      EoLastSentence: Real;          // end of the previous sentence (in beats)
      LastDrawBeat: Real;
      UpperLine:      TLyricLine;    // first line displayed (top)
      LowerLine:      TLyricLine;    // second lind displayed (bottom)
      QueueLine:      TLyricLine;    // third line (queue and will be displayed when next line is finished)

      IndicatorTex:   TTexture;       // texture for lyric indikator
      BallTex:        TTexture;       // texture of the ball for the lyric effect

      inQueue:        Boolean;        // is line in queue
      LCounter:       Word;           // line counter

      // duet mode - textures for player icons
      PlayerIconTex:  array[0..5] of  // player idx
                      array [0..1] of // enabled disabled
                      TTexture;


      //Some helper Procedures for Lyric Drawing
      procedure DrawLyrics (Beat: Real);
      procedure DrawLyricsLine(X, W, Y: Real; Size: Byte; Line: TLyricLine; Beat: Real);
      procedure DrawPlayerIcon(Player: Byte; Enabled: Boolean; X, Y, Size, Alpha: Real);
      procedure DrawBall(XBall, YBall, Alpha:Real);

    public
      // positions, line specific settings
      UpperLineX:     Real;       //X Start Pos of UpperLine
      UpperLineW:     Real;       //Width of UpperLine with Icon(s) and Text
      UpperLineY:     Real;       //Y Start Pos of UpperLine
      UpperLineSize:  Byte;       //Max Size of Lyrics Text in UpperLine

      LowerLineX:     Real;       //X Start Pos of LowerLine
      LowerLineW:     Real;       //Width of LowerLine with Icon(s) and Text
      LowerLineY:     Real;       //Y Start Pos of LowerLine
      LowerLineSize:  Byte;       //Max Size of Lyrics Text in LowerLine

      // display propertys
      LineColor_en:   TRGBA;      //Color of Words in an Enabled Line
      LineColor_dis:  TRGBA;      //Color of Words in a Disabled Line
      LineColor_act:  TRGBA;      //Color of teh active Word
      FontStyle:      Byte;       //Font for the Lyric Text
      FontReSize:     Boolean;    //ReSize Lyrics if they don't fit Screen
      
      { // currently not used
       FadeInEffect:   Byte;       //Effect for Line Fading in: 0: No Effect; 1: Fade Effect; 2: Move Upwards from Bottom to Pos
       FadeOutEffect:  Byte;       //Effect for Line Fading out: 0: No Effect; 1: Fade Effect; 2: Move Upwards
      }

      UseLinearFilter:Boolean;    //Should Linear Tex Filter be used

      // song specific settings
      BPM:            Real;
      Resolution:     Integer;

      // properties to easily read options of this class
      property LineinQueue: Boolean read inQueue;    // line in queue?
      property LineCounter: Word    read LCounter;   // lines that were progressed so far (after last clear)

      procedure AddLine(Line: PLine);              // adds a line to the queue, if there is space
      procedure Draw (Beat: Real);                 // draw the current (active at beat) lyrics

      // clears all cached song specific information
      procedure Clear(cBPM: Real = 0; cResolution: Integer = 0);

      function GetUpperLine(): TLyricLine;
      function GetLowerLine(): TLyricLine;

      constructor Create; overload;
      constructor Create(ULX,ULY,ULW,ULS,LLX,LLY,LLW,LLS: Real); overload;
      procedure   LoadTextures;
      destructor  Destroy; override;
  end;

implementation

uses SysUtils,
     USkins,
     TextGL,
     UGraphic,
     UDisplay,
     math,
     UIni;

//-----------
//Helper procs to use TRGB in Opengl ...maybe this should be somewhere else
//-----------
procedure glColorRGB(Color: TRGB);  overload;
begin
  glColor3f(Color.R, Color.G, Color.B);
end;

procedure glColorRGB(Color: TRGB; Alpha: Real);  overload;
begin
  glColor4f(Color.R, Color.G, Color.B, Alpha);
end;

procedure glColorRGB(Color: TRGBA); overload;
begin
  glColor4f(Color.R, Color.G, Color.B, Color.A);
end;

procedure glColorRGB(Color: TRGBA; Alpha: Real); overload;
begin
  glColor4f(Color.R, Color.G, Color.B, Min(Color.A, Alpha));
end;



//---------------
// Create - Constructor, just get Memory
//---------------
constructor TLyricEngine.Create;
begin
  inherited;

  BPM := 0;
  Resolution := 0;
  LCounter := 0;
  inQueue := False;

  UpperLine := TLyricLine.Create;
  LowerLine := TLyricLine.Create;
  QueueLine := TLyricLine.Create;

  UpperLine.Done := True;
  LowerLine.Done := True;
  QueueLine.Done := True;

  UseLinearFilter := True;
  LastDrawBeat:=0;
end;

constructor TLyricEngine.Create(ULX,ULY,ULW,ULS,LLX,LLY,LLW,LLS:Real);
begin
  Create;
  
  UpperLineX := ULX;
  UpperLineW := ULW;
  UpperLineY := ULY;
  UpperLineSize := Trunc(ULS);

  LowerLineX := LLX;
  LowerLineW := LLW;
  LowerLineY := LLY;
  LowerLineSize := Trunc(LLS);

  LoadTextures;
end;


//---------------
// Destroy - Frees Memory
//---------------
destructor TLyricEngine.Destroy;
begin
  UpperLine.Free;
  LowerLine.Free;
  QueueLine.Free;
  inherited;
end;

//---------------
// Clear - Clears all cached Song specific Information
//---------------
procedure TLyricEngine.Clear(cBPM: Real; cResolution: Integer);
begin
  BPM := cBPM;
  Resolution := cResolution;
  LCounter := 0;
  inQueue := False;

  UpperLine.Done := True;
  LowerLine.Done := True;
  QueueLine.Done := True;
  
  LastDrawBeat:=0;
end;


//---------------
// LoadTextures - Load Player Textures and Create Lyric Textures
//---------------
procedure TLyricEngine.LoadTextures;
var
  I: Integer;
  
  function CreateLineTex: glUint;
  var
    PTexData: Pointer;
  begin
    try
      // get memory
      GetMem(pTexData, 1024*64*4); 

      // generate and bind Texture
      glGenTextures(1, @Result);
      glBindTexture(GL_TEXTURE_2D, Result);

      // get texture memeory
      glTexImage2D(GL_TEXTURE_2D, 0, 4, 1024, 64, 0, GL_RGBA, GL_UNSIGNED_BYTE, pTexData);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

      if UseLinearFilter then
      begin
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
      end;

    finally  
      // free unused memory
      FreeMem(pTexData);
    end;
  end;
begin
  
  // lyric indicator (bar that indicates when the line start)
  IndicatorTex := Texture.LoadTexture(Skin.GetTextureFileName('LyricHelpBar'), TEXTURE_TYPE_TRANSPARENT, $FF00FF);

  // ball for current word hover in ball effect
  BallTex := Texture.LoadTexture(Skin.GetTextureFileName('Ball'), TEXTURE_TYPE_TRANSPARENT, 0);

  // duet mode: load player icon
  For I := 0 to 5 do
  begin
    PlayerIconTex[I][0] := Texture.LoadTexture(Skin.GetTextureFileName('LyricIcon_P' + InttoStr(I+1)), TEXTURE_TYPE_TRANSPARENT, 0);
    PlayerIconTex[I][1] := Texture.LoadTexture(Skin.GetTextureFileName('LyricIconD_P' + InttoStr(I+1)), TEXTURE_TYPE_TRANSPARENT, 0);
  end;
  
  // create line textures
  UpperLine.Tex := CreateLineTex;
  LowerLine.Tex := CreateLineTex;
  QueueLine.Tex := CreateLineTex;
end;


//---------------
// AddLine - Adds LyricLine to queue
//---------------
Procedure   TLyricEngine.AddLine(Line: PLine);
var
  LyricLine: TLyricLine;
  countNotes: Cardinal;
  Viewport: Array[0..3] of Integer;

  PosX: Real;
  I:  Integer;

  function CalcWidth(LyricLine: TLyricLine): Real;
  begin
    Result := glTextWidth(PChar(LyricLine.Text));

    Result := Result + (LyricLine.CountFreestyle * 10);

    // if the line ends with a freestyle not, then leave the place to finish to draw the text italic
    if (LyricLine.Words[High(LyricLine.Words)].Freestyle) then
      Result := Result + 12;
  end;

begin
  // only add lines, if there is space
  If not LineinQueue then
  begin
    // set pointer to line to write

    If (LineCounter = 0) then
      LyricLine := UpperLine
    else if (LineCounter = 1) then
      LyricLine := LowerLine
    else
    begin
      LyricLine := QueueLine;

      //now there is a queued line
      inQueue   := True;
    end;
  end
  else
  begin // rotate lines (round-robin-like)
    LyricLine  := UpperLine;
    UpperLine := LowerLine;
    LowerLine := QueueLine;
    QueueLine := LyricLine;
  end;

  // sentence has notes?
  If  Line = nil then
  begin
    // reset all values, if the new line is nil (lines after the last line)
    LyricLine.Start     := 0;
    LyricLine.Length    := 0;
    LyricLine.CurWord   := -1;
    LyricLine.LastLine  := False;
    LyricLine.Width     := 0;
    SetLength(LyricLine.Words, 0);
  end
  else if Length(Line.Note) > 0 then
  begin
    // copy values from SongLine to LyricLine
    CountNotes          := High(Line.Note);
    LyricLine.Start     := Line.Note[0].Start;
    LyricLine.Length    := Line.Note[CountNotes].Start + Line.Note[CountNotes].Length - LyricLine.Start;
    LyricLine.CurWord   := -1;
    LyricLine.LastLine  := Line.LastLine;

    // default values - set later
    LyricLine.HasFreestyle := False;
    LyricLine.CountFreestyle := 0;
    LyricLine.Text      := '';

    // duet mode: players of that line
    LyricLine.Players   := 127;

    //copy words
    SetLength(LyricLine.Words, CountNotes + 1);
    For I := 0 to CountNotes do
    begin
      LyricLine.Words[I].Start     := Line.Note[I].Start;
      LyricLine.Words[I].Length    := Line.Note[I].Length;
      LyricLine.Words[I].Text      := Line.Note[I].Text;
      LyricLine.Words[I].Freestyle := Line.Note[I].NoteType = ntFreestyle;

      LyricLine.HasFreestyle       := LyricLine.HasFreestyle OR LyricLine.Words[I].Freestyle;
      LyricLine.Text               := LyricLine.Text + LyricLine.Words[I].Text;

      if (I > 0) AND LyricLine.Words[I-1].Freestyle AND not LyricLine.Words[I].Freestyle then
        Inc(LyricLine.CountFreestyle);
    end;

    // set font params
    SetFontStyle(FontStyle);
    SetFontPos(0, 0);
    LyricLine.Size := UpperLineSize;
    SetFontSize(LyricLine.Size);
    SetFontItalic(False);
    glColor4f(1, 1, 1, 1);

    // change fontsize to fit the screen
    LyricLine.Width := CalcWidth(LyricLine);
    while (LyricLine.Width > UpperLineW) do
    begin
      Dec(LyricLine.Size);

      if (LyricLine.Size <=1) then
        Break;

      SetFontSize(LyricLine.Size);
      LyricLine.Width := CalcWidth(LyricLine);
    end;

    // create LyricTexture - prepare OpenGL
    glGetIntegerv(GL_VIEWPORT, @ViewPort);
    glClearColor(0.0,0.0,0.0,0.0);
    glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
    glViewPort(0,0,800,600);

    // set word positions and line size
    PosX := 0;
    for I := 0 to High(LyricLine.Words) do
    begin
      with LyricLine.Words[I] do
      begin
        SetFontItalic(Freestyle);

        X := PosX;

        //Draw Lyrics
        SetFontPos(PosX, 0);
        glPrint(PChar(Text));

        Width := glTextWidth(PChar(Text));
        if (I < High(LyricLine.Words)) AND Freestyle AND not LyricLine.Words[I+1].Freestyle then
          Width := Width + 10
        else
          if (I = High(LyricLine.Words)) AND Freestyle then
            Width := Width + 12;
        PosX := PosX + Width;
      end;
    end;
  end
  else
  begin
    // create LyricTexture - prepare OpenGL
    glGetIntegerv(GL_VIEWPORT, @ViewPort);
    glClearColor(0.0,0.0,0.0,0.0);
    glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);
    glViewPort(0,0,800,600);
  end;

  //for debugging, is this used anymore?
  //Display.ScreenShot;

  //Copy to Texture
  glEnable(GL_ALPHA);
  glBindTexture(GL_TEXTURE_2D, LyricLine.Tex);
  glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 0, 600-64, 1024, 64, 0);
  glDisable(GL_ALPHA);

  //Clear Buffer
  glClearColor(0,0,0,0);
  glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT);

  glViewPort(ViewPort[0], ViewPort[1], ViewPort[2], ViewPort[3]);

  //Increase the Counter
  Inc(LCounter);
end;


//---------------
// Draw - Procedure Draws Lyrics; Beat is curent Beat in Quarters
//        Draw just manage the Lyrics, drawing is done by a call of DrawLyrics
//---------------
procedure TLyricEngine.Draw (Beat: Real);
begin
  DrawLyrics(Beat);
  LastDrawBeat := Beat;
end;

//---------------
// DrawLyrics(private) - Helper for Draw; main Drawing procedure
//---------------
procedure TLyricEngine.DrawLyrics (Beat: Real);
begin
  DrawLyricsLine(UpperLineX, UpperLineW, UpperlineY, 15, Upperline, Beat);
  DrawLyricsLine(LowerLineX, LowerLineW, LowerlineY, 15, Lowerline, Beat);
end;

//---------------
// DrawPlayerIcon(private) - Helper for Draw; Draws a Playericon
//---------------
procedure TLyricEngine.DrawPlayerIcon(Player: Byte; Enabled: Boolean; X, Y, Size, Alpha: Real);
var IEnabled: Byte;
begin
  case Enabled of
    True: 	IEnabled := 0;
    False:  IEnabled := 1;
  end;

  try
    glEnable(GL_TEXTURE_2D);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glBindTexture(GL_TEXTURE_2D, PlayerIconTex[Player][IEnabled].TexNum);

    glColor4f(1,1,1,Alpha);
    glBegin(GL_QUADS);
      glTexCoord2f(0, 0); glVertex2f(X, Y);
      glTexCoord2f(0, 1); glVertex2f(X, Y + Size);
      glTexCoord2f(1, 1); glVertex2f(X + Size, Y + Size);
      glTexCoord2f(1, 0); glVertex2f(X + Size, Y);
    glEnd;

  finally
    glDisable(GL_BLEND);
    glDisable(GL_TEXTURE_2D);
  end;
end;

//---------------
// DrawBall(private) - Helper for Draw; Draws the Ball over the LyricLine if needed
//---------------
procedure TLyricEngine.DrawBall(XBall, YBall, Alpha: Real);
begin
  try
    glEnable(GL_TEXTURE_2D);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glBindTexture(GL_TEXTURE_2D, BallTex.TexNum);

    glColor4f(1,1,1, Alpha);
    glBegin(GL_QUADS);
      glTexCoord2f(0, 0); glVertex2f(XBall - 10, YBall);
      glTexCoord2f(0, 1); glVertex2f(XBall - 10, YBall + 20);
      glTexCoord2f(1, 1); glVertex2f(XBall + 10, YBall + 20);
      glTexCoord2f(1, 0); glVertex2f(XBall + 10, YBall);
    glEnd;

  finally
    glDisable(GL_BLEND);
    glDisable(GL_TEXTURE_2D);
  end;
end;

//---------------
// DrawLyricsLine(private) - Helper for Draw; Draws one LyricLine
//---------------
procedure TLyricEngine.DrawLyricsLine(X, W, Y: Real; Size: Byte; Line: TLyricLine; Beat: Real);
var
  CurWordStart, CurWordEnd: Real; // screen coordinates of current word and the rest of the sentence
  FreestyleDiff: Integer;         // difference between top and bottom coordiantes for freestyle lyrics
  Progress: Real;                 // progress of singing the current word
  LyricX: Real;                   // left
  LyricX2: Real;                  // right
  LyricY: Real;                   // top
  LyricsHeight: Real;             // height the lyrics are displayed
  Alpha: Real;                    // alphalevel to fade out at end

  {// duet mode
  IconSize: Real;                 // size of player icons
  IconAlpha: Real;                // alpha level of player icons
  }
begin
  // lines with a width lower than 0, have not to be draw
  if Line.Width <= 0 then
    exit;

  // this is actually a bit more than the real font size
  // it helps adjusting the "zoom-center"
  LyricsHeight:=30.5 * (Line.Size/10);
  
  {
  // duet mode
  IconSize := (2 * Size);
  IconAlpha := Frac(Beat/(Resolution*4));
  
  DrawPlayerIcon (0, True, X, Y + (42 - IconSize) / 2 , IconSize, IconAlpha);
  DrawPlayerIcon (1, True, X + IconSize + 1,  Y + (42 - IconSize) / 2, IconSize, IconAlpha);
  DrawPlayerIcon (2, True, X + (IconSize + 1)*2, Y + (42 - IconSize) / 2, IconSize, IconAlpha);
  }
  
  LyricX := X+W/2 - Line.Width/2;
  LyricX2 := LyricX + Line.Width;

  // maybe center smaller lines
  //LyricY := Y;
  LyricY := Y + ((Size / Line.Size - 1) * LyricsHeight) / 2;

  Alpha := 1;

  // word in the sentence is active?
  if (Line.Start < Beat) then
  begin
    // if this line just got active, then CurWord is still -1
    // this means, we should try to make the first word active
    // then we check if the current active word is still meant to be active
    // if not, we proceed to the next word
    if Line.CurWord = -1 then
      Line.CurWord:=0;

    if (Line.CurWord < High(Line.Words)) and (Beat >= (Line.Words[Line.CurWord + 1].Start)) then
      Line.CurWord:=Line.CurWord+1;

    FreestyleDiff := 0;

    // last word of this line finished, but this line did not hide
    if (Line.CurWord > High(Line.Words)) then
    begin
      CurWordStart := Line.Words[High(Line.Words)].X + Line.Words[High(Line.Words)].Width;
      CurWordEnd := CurWordStart;

      // fade out last line
      if Line.LastLine then
      begin
        Alpha := 1 - (Beat - (Line.Words[High(Line.Words)].Start + Line.Words[High(Line.Words)].Length)) / 15;
        if (Alpha < 0) then
          Alpha := 0;
      end;
    end
    else
    begin
      with Line.Words[Line.CurWord] do
      begin
        Progress := (Beat - Start) / Length;
        if Progress >= 1 then
          Progress := 1;

        if Progress <= 0 then
          Progress := 0;

        CurWordStart:=X;
        CurWordEnd:=X+Width;

        // Slide Effect
        // simply paint the active texture to the current position
        if Ini.LyricsEffect = 2 then
        begin
          CurWordStart := CurWordStart + Width * progress;
          CurWordEnd := CurWordStart;
        end;

        if (Line.CurWord < High(Line.Words)) and
           Freestyle and
           (not Line.Words[Line.CurWord + 1].Freestyle) then
        begin
          FreestyleDiff := 2;
        end
        else
          if Freestyle then
          begin
            FreestyleDiff := 12;
            CurWordStart := CurWordStart - 1;
            CurWordEnd := CurWordEnd - 2;
          end;
      end;
    end;

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE_2D, Line.Tex);

    // draw sentence up to current word
    if (Ini.LyricsEffect = 3) or (Ini.LyricsEffect = 4) then
      // ball lyric effect - only highlight current word and not that ones before in this line
      glColorRGB(LineColor_en, Alpha)
    else
      glColorRGB(LineColor_act, Alpha);

    glBegin(GL_QUADS);
      glTexCoord2f(0, 1); glVertex2f(LyricX, LyricY);
      glTexCoord2f(0, 1-LyricsHeight/64); glVertex2f(LyricX, LyricY + LyricsHeight);
      glTexCoord2f(CurWordStart/1024, 1-LyricsHeight/64); glVertex2f(LyricX+CurWordStart, LyricY + LyricsHeight);
      glTexCoord2f((CurWordStart+FreestyleDiff)/1024, 1); glVertex2f(LyricX+CurWordStart+FreestyleDiff, LyricY);
    glEnd;

    // draw rest of sentence
    glColorRGB(LineColor_en);
    glBegin(GL_QUADS);
      glTexCoord2f((CurWordEnd+FreestyleDiff)/1024, 1); glVertex2f(LyricX+CurWordEnd+FreestyleDiff, LyricY);
      glTexCoord2f(CurWordEnd/1024, 1-LyricsHeight/64); glVertex2f(LyricX+CurWordEnd, LyricY + LyricsHeight);
      glTexCoord2f(Line.Width/1024, 1-LyricsHeight/64); glVertex2f(LyricX2, LyricY + LyricsHeight);
      glTexCoord2f(Line.Width/1024, 1); glVertex2f(LyricX2, LyricY);
    glEnd;

    // draw active word:
    // type 0: simple lyric effect
    // type 3: ball lyric effect
    // type 4: shift lyric effect
    // only change the color of the current word
    if (Ini.LyricsEffect = 0) or (Ini.LyricsEffect = 3) or (Ini.LyricsEffect = 4) then
    begin
      { // maybe fade in?
      glColor4f(LineColor_en.r,LineColor_en.g,LineColor_en.b,1-progress);
      glBegin(GL_QUADS);
        glTexCoord2f(CurWordStart/1024, 1); glVertex2f(LyricX+CurWordStart, Y);
        glTexCoord2f(CurWordStart/1024, 0); glVertex2f(LyricX+CurWordStart, Y + 64);
        glTexCoord2f(CurWordEnd/1024, 0); glVertex2f(LyricX+CurWordEnd, Y + 64);
        glTexCoord2f(CurWordEnd/1024, 1); glVertex2f(LyricX+CurWordEnd, Y);
      glEnd;
      }
      
      if (Ini.LyricsEffect = 4) then
        LyricY := LyricY - 8 * (1-progress);
      
      glColor3f(LineColor_act.r,LineColor_act.g,LineColor_act.b);
      glBegin(GL_QUADS);
        glTexCoord2f((CurWordStart+FreestyleDiff)/1024, 1); glVertex2f(LyricX+CurWordStart+FreestyleDiff, LyricY);
        glTexCoord2f(CurWordStart/1024, 0); glVertex2f(LyricX+CurWordStart, LyricY + 64);
        glTexCoord2f(CurWordEnd/1024, 0); glVertex2f(LyricX+CurWordEnd, LyricY + 64);
        glTexCoord2f((CurWordEnd+FreestyleDiff)/1024, 1); glVertex2f(LyricX+CurWordEnd+FreestyleDiff, LyricY);
      glEnd;
      
      if (Ini.LyricsEffect = 4) then
        LyricY := LyricY + 8 * (1-progress);
    end
      
    // draw active word:
    // type 1: zoom lyric effect
    // change color and zoom current word
    else if Ini.LyricsEffect = 1 then
    begin
      glPushMatrix;
      glTranslatef(LyricX+CurWordStart+(CurWordEnd-CurWordStart)/2,LyricY+LyricsHeight/2,0);
      glScalef(1.0+(1-progress)/2,1.0+(1-progress)/2,1.0);
      glColor4f(LineColor_en.r,LineColor_en.g,LineColor_en.b,1-progress);
      glBegin(GL_QUADS);
        glTexCoord2f((CurWordStart+FreestyleDiff)/1024, 1); glVertex2f(-(CurWordEnd-CurWordStart)/2+FreestyleDiff, -LyricsHeight/2);
        glTexCoord2f(CurWordStart/1024, 1-LyricsHeight/64); glVertex2f(-(CurWordEnd-CurWordStart)/2, + LyricsHeight/2);
        glTexCoord2f(CurWordEnd/1024, 1-LyricsHeight/64); glVertex2f((CurWordEnd-CurWordStart)/2, + LyricsHeight/2);
        glTexCoord2f((CurWordEnd+FreestyleDiff)/1024, 1); glVertex2f((CurWordEnd-CurWordStart)/2+FreestyleDiff, -LyricsHeight/2);
      glEnd;
      glColor4f(LineColor_act.r,LineColor_act.g,LineColor_act.b,1);
      glBegin(GL_QUADS);
        glTexCoord2f((CurWordStart+FreestyleDiff)/1024, 1); glVertex2f(-(CurWordEnd-CurWordStart)/2+FreestyleDiff, -LyricsHeight/2);
        glTexCoord2f(CurWordStart/1024, 1-LyricsHeight/64); glVertex2f(-(CurWordEnd-CurWordStart)/2,  + LyricsHeight/2);
        glTexCoord2f(CurWordEnd/1024, 1-LyricsHeight/64); glVertex2f((CurWordEnd-CurWordStart)/2,  + LyricsHeight/2);
        glTexCoord2f((CurWordEnd+FreestyleDiff)/1024, 1); glVertex2f((CurWordEnd-CurWordStart)/2+FreestyleDiff, -LyricsHeight/2);
      glEnd;
      glPopMatrix;
    end;

    glDisable(GL_TEXTURE_2D);
    glDisable(GL_BLEND);
    
    if Ini.LyricsEffect = 3 then
      DrawBall(LyricX + CurWordStart + (CurWordEnd - CurWordStart) * progress, LyricY - 15 - 15*sin(progress * pi), Alpha);
  end
  else
  begin
    // draw complete inactive sentence if line hasn't started but is already shown
    glEnable(GL_TEXTURE_2D);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glBindTexture(GL_TEXTURE_2D, Line.Tex);

    glColorRGB(LineColor_dis);
    glBegin(GL_QUADS);
      glTexCoord2f(0, 1); glVertex2f(LyricX, LyricY);
      glTexCoord2f(0, 1-LyricsHeight/64); glVertex2f(LyricX, LyricY + LyricsHeight);
      glTexCoord2f(Line.Width/1024, 1-LyricsHeight/64); glVertex2f(LyricX2, LyricY + LyricsHeight);
      glTexCoord2f(Line.Width/1024, 1); glVertex2f(LyricX2, LyricY);
    glEnd;

    glDisable(GL_BLEND);
    glDisable(GL_TEXTURE_2D);
  end;
end;

function TLyricEngine.GetUpperLine(): TLyricLine;
begin
  Result := UpperLine;
end;

function TLyricEngine.GetLowerLine(): TLyricLine;
begin
  Result := LowerLine;
end;

end.