aboutsummaryrefslogtreecommitdiffstats
path: root/songmanagement/src/screens/UScreenOptionsRecord.pas
blob: 7af598e54355ccba6ad1c98027066f93376bd3b0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
{* UltraStar Deluxe - Karaoke Game
 *
 * UltraStar Deluxe is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *}

unit UScreenOptionsRecord;

interface

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

{$I switches.inc}

uses
  UThemes,
  UMusic,
  URecord,
  UMenu;

type
  TDrawState = record
    ChannelIndex: integer;
    R, G, B: real;    // mapped player color (normal)
    RD, GD, BD: real; // mapped player color (dark)
  end;

  TPeakInfo = record
    Volume: single;
    Time: cardinal;
  end;

  TScreenOptionsRecord = class(TMenu)
    private
      // max. count of input-channels determined for all devices
      MaxChannelCount: integer;

      // current input device
      CurrentDeviceIndex: integer;
      PreviewDeviceIndex: integer;

      // string arrays for select-slide options
      InputSourceNames: array of UTF8String;
      InputDeviceNames: array of UTF8String;

      // dynamic generated themes for channel select-sliders
      SelectSlideChannelTheme: array of TThemeSelectSlide;

      // indices for widget-updates
      SelectInputSourceID:   integer;
      SelectSlideChannelID: array of integer;

      // interaction IDs
      ExitButtonIID: integer;

      // dummy data for non-available channels
      ChannelToPlayerMapDummy: integer;

      // preview channel-buffers
      PreviewChannel: array of TCaptureBuffer;
      ChannelPeak: array of TPeakInfo;

      // Device source volume
      SourceVolume: single;
      NextVolumePollTime: cardinal;

      procedure StartPreview;
      procedure StopPreview;
      procedure UpdateInputDevice;
      function ValidateSettings: boolean;
      procedure ChangeVolume(VolumeChange: single);
      procedure DrawVolume(x, y, Width, Height: single);
      procedure DrawVUMeter(const State: TDrawState; x, y, Width, Height: single);
      procedure DrawPitch(const State: TDrawState; x, y, Width, Height: single);
    public
      constructor Create; override;
      function    Draw: boolean; override;
      function    ParseInput(PressedKey: cardinal; CharCode: UCS4Char; PressedDown: boolean): boolean; override;
      procedure   OnShow; override;
      procedure   OnHide; override;
  end;

const
  PeakDecay = 0.2; // strength of peak-decay (reduction after one sec)

const
  BarHeight  = 11; // height of each bar (volume/vu-meter/pitch)
  BarUpperSpacing = 1;  // spacing between a bar-area and the previous widget
  BarLowerSpacing = 3;  // spacing between a bar-area and the next widget
  SourceBarsTotalHeight = BarHeight + BarUpperSpacing + BarLowerSpacing;
  ChannelBarsTotalHeight = 2*BarHeight + BarUpperSpacing + BarLowerSpacing;

implementation

uses
  SysUtils,
  Math,
  SDL,
  gl,
  TextGL,
  UGraphic,
  UDraw,
  ULanguage,
  UMain,
  UMenuSelectSlide,
  UMenuText,
  UFiles,
  UDisplay,
  UIni,
  UUnicodeUtils,
  ULog;

function TScreenOptionsRecord.ParseInput(PressedKey: cardinal; CharCode: UCS4Char; PressedDown: boolean): boolean;
begin
  Result := true;
  if (PressedDown) then
  begin // Key Down
    // check normal keys
    case UCS4UpperCase(CharCode) of
      Ord('Q'):
        begin
          Result := false;
          Exit;
        end;
      Ord('+'):
        begin
          // FIXME: add a nice volume-slider instead
          // or at least provide visualization and acceleration if the user holds the key pressed.
          ChangeVolume(0.02);
        end;
      Ord('-'):
        begin
          // FIXME: add a nice volume-slider instead
          // or at least provide visualization and acceleration if the user holds the key pressed.
          ChangeVolume(-0.02);
        end;
      Ord('T'):
        begin
          if ((SDL_GetModState() and KMOD_SHIFT) <> 0) then
            Ini.ThresholdIndex := (Ini.ThresholdIndex + Length(IThresholdVals) - 1) mod Length(IThresholdVals)
          else
            Ini.ThresholdIndex := (Ini.ThresholdIndex + 1) mod Length(IThresholdVals);
        end;
    end;

    // check special keys
    case PressedKey of
      SDLK_ESCAPE,
      SDLK_BACKSPACE:
        begin
          // TODO: Show Save/Abort screen
          if (ValidateSettings()) then
          begin
            Ini.Save;
            AudioPlayback.PlaySound(SoundLib.Back);
            FadeTo(@ScreenOptions);
          end;
        end;
      SDLK_RETURN:
        begin
          if (SelInteraction = ExitButtonIID) then
          begin
            if (ValidateSettings()) then
            begin
              Ini.Save;
              AudioPlayback.PlaySound(SoundLib.Back);
              FadeTo(@ScreenOptions);
            end;
          end;
        end;
      SDLK_DOWN:
        InteractNext;
      SDLK_UP :
        InteractPrev;
      SDLK_RIGHT:
        begin
          if (SelInteraction >= 0) and (SelInteraction < ExitButtonIID) then
          begin
            AudioPlayback.PlaySound(SoundLib.Option);
            InteractInc;
          end;
          UpdateInputDevice;
        end;
      SDLK_LEFT:
        begin
          if (SelInteraction >= 0) and (SelInteraction < ExitButtonIID) then
          begin
            AudioPlayback.PlaySound(SoundLib.Option);
            InteractDec;
          end;
          UpdateInputDevice;
        end;
    end;
  end;
end;

function TScreenOptionsRecord.ValidateSettings: boolean;
var
  BadPlayer: integer;
begin
  BadPlayer := AudioInputProcessor.ValidateSettings();
  if (BadPlayer <> 0) then
  begin
    ScreenPopupError.ShowPopup(
        Format(Language.Translate('ERROR_PLAYER_DEVICE_ASSIGNMENT'),
        [BadPlayer]));
    Result := false;
  end
  else
  begin
    Result := true;
  end;
end;

constructor TScreenOptionsRecord.Create;
var
  DeviceIndex:  integer;
  SourceIndex:  integer;
  ChannelIndex: integer;
  InputDevice: TAudioInputDevice;
  InputDeviceCfg: PInputDeviceConfig;
  ChannelTheme: ^TThemeSelectSlide;
  //ButtonTheme: TThemeButton;
  WidgetYPos: integer;
begin
  inherited Create;

  LoadFromTheme(Theme.OptionsRecord);

  // set CurrentDeviceIndex to a valid device
  if (Length(AudioInputProcessor.DeviceList) > 0) then
    CurrentDeviceIndex := 0
  else
    CurrentDeviceIndex := -1;

  PreviewDeviceIndex := -1;

  WidgetYPos := 0;

  // init sliders if at least one device was detected
  if (Length(AudioInputProcessor.DeviceList) > 0) then
  begin
    InputDevice := AudioInputProcessor.DeviceList[CurrentDeviceIndex];
    InputDeviceCfg := @Ini.InputDeviceConfig[InputDevice.CfgIndex];

    // init device-selection slider
    SetLength(InputDeviceNames, Length(AudioInputProcessor.DeviceList));
    for DeviceIndex := 0 to High(AudioInputProcessor.DeviceList) do
    begin
      InputDeviceNames[DeviceIndex] := AudioInputProcessor.DeviceList[DeviceIndex].Name;
    end;
    // add device-selection slider (InteractionID: 0)
    Theme.OptionsRecord.SelectSlideCard.showArrows := true;
    Theme.OptionsRecord.SelectSlideCard.oneItemOnly := true;
    AddSelectSlide(Theme.OptionsRecord.SelectSlideCard, CurrentDeviceIndex, InputDeviceNames);

    // init source-selection slider
    SetLength(InputSourceNames, Length(InputDevice.Source));
    for SourceIndex := 0 to High(InputDevice.Source) do
    begin
      InputSourceNames[SourceIndex] := InputDevice.Source[SourceIndex].Name;
    end;

    Theme.OptionsRecord.SelectSlideInput.showArrows := true;
    Theme.OptionsRecord.SelectSlideInput.oneItemOnly := true;
    // add source-selection slider (InteractionID: 1)
    SelectInputSourceID := AddSelectSlide(Theme.OptionsRecord.SelectSlideInput,
        InputDeviceCfg.Input, InputSourceNames);

    // add space for source volume bar
    WidgetYPos := Theme.OptionsRecord.SelectSlideInput.Y +
                  Theme.OptionsRecord.SelectSlideInput.H +
                  SourceBarsTotalHeight;

    // find max. channel count of all devices
    MaxChannelCount := 0;
    for DeviceIndex := 0 to High(AudioInputProcessor.DeviceList) do
    begin
      if (AudioInputProcessor.DeviceList[DeviceIndex].AudioFormat.Channels > MaxChannelCount) then
        MaxChannelCount := AudioInputProcessor.DeviceList[DeviceIndex].AudioFormat.Channels;
    end;

    // init channel-to-player mapping sliders
    SetLength(SelectSlideChannelID, MaxChannelCount);
    SetLength(SelectSlideChannelTheme, MaxChannelCount);

    for ChannelIndex := 0 to MaxChannelCount-1 do
    begin
      // copy reference slide
      SelectSlideChannelTheme[ChannelIndex] :=
        Theme.OptionsRecord.SelectSlideChannel;
      // set current channel-theme
      ChannelTheme := @SelectSlideChannelTheme[ChannelIndex];
      // adjust vertical position
      ChannelTheme.Y := WidgetYPos;
      // calc size of next slide (add space for bars)
      WidgetYPos := WidgetYPos + ChannelTheme.H + ChannelBarsTotalHeight;
      // append channel index to name
      ChannelTheme.Text := ChannelTheme.Text + IntToStr(ChannelIndex+1);

      // show/hide widgets depending on whether the channel exists
      if (ChannelIndex < Length(InputDeviceCfg.ChannelToPlayerMap)) then
      begin
        // current device has this channel

        // add slider
        SelectSlideChannelID[ChannelIndex] := AddSelectSlide(ChannelTheme^,
          InputDeviceCfg.ChannelToPlayerMap[ChannelIndex], IChannelPlayerTranslated);
      end
      else
      begin
        // current device does not have that many channels

        // add slider but hide it and assign a dummy variable to it
        SelectSlideChannelID[ChannelIndex] := AddSelectSlide(ChannelTheme^,
          ChannelToPlayerMapDummy, IChannelPlayerTranslated);
        SelectsS[SelectSlideChannelID[ChannelIndex]].Visible := false;
      end;
    end;
  end;

  // add Exit-button
  AddButton(Theme.OptionsRecord.ButtonExit);
  if (Length(Button[0].Text) = 0) then
    AddButtonText(20, 5, Theme.Options.Description[7]);
  // store InteractionID
  if (Length(AudioInputProcessor.DeviceList) > 0) then
    ExitButtonIID := MaxChannelCount + 2
  else
    ExitButtonIID := 0;

  // set focus
  Interaction := 0;
end;

procedure TScreenOptionsRecord.UpdateInputDevice;
var
  SourceIndex: integer;
  InputDevice: TAudioInputDevice;
  InputDeviceCfg: PInputDeviceConfig;
  ChannelIndex: integer;
begin
  //Log.LogStatus('Update input-device', 'TScreenOptionsRecord.UpdateCard') ;

  StopPreview();

  // set CurrentDeviceIndex to a valid device
  if (CurrentDeviceIndex > High(AudioInputProcessor.DeviceList)) then
    CurrentDeviceIndex := 0;

  // update sliders if at least one device was detected
  if (Length(AudioInputProcessor.DeviceList) > 0) then
  begin
    InputDevice := AudioInputProcessor.DeviceList[CurrentDeviceIndex];
    InputDeviceCfg := @Ini.InputDeviceConfig[InputDevice.CfgIndex];

    // update source-selection slider
    SetLength(InputSourceNames, Length(InputDevice.Source));
    for SourceIndex := 0 to High(InputDevice.Source) do
    begin
      InputSourceNames[SourceIndex] := InputDevice.Source[SourceIndex].Name;
    end;
    UpdateSelectSlideOptions(Theme.OptionsRecord.SelectSlideInput, SelectInputSourceID,
        InputSourceNames, InputDeviceCfg.Input);

    // update channel-to-player mapping sliders
    for ChannelIndex := 0 to MaxChannelCount-1 do
    begin
      // show/hide widgets depending on whether the channel exists
      if (ChannelIndex < Length(InputDeviceCfg.ChannelToPlayerMap)) then
      begin
        // current device has this channel

        // show slider
        UpdateSelectSlideOptions(SelectSlideChannelTheme[ChannelIndex],
          SelectSlideChannelID[ChannelIndex], IChannelPlayerTranslated,
          InputDeviceCfg.ChannelToPlayerMap[ChannelIndex]);
        SelectsS[SelectSlideChannelID[ChannelIndex]].Visible := true;
      end
      else
      begin
        // current device does not have that many channels

        // hide slider and assign a dummy variable to it
        UpdateSelectSlideOptions(SelectSlideChannelTheme[ChannelIndex],
          SelectSlideChannelID[ChannelIndex], IChannelPlayerTranslated,
          ChannelToPlayerMapDummy);
        SelectsS[SelectSlideChannelID[ChannelIndex]].Visible := false;
      end;
    end;
  end;

  StartPreview();
end;

procedure TScreenOptionsRecord.ChangeVolume(VolumeChange: single);
var
  InputDevice: TAudioInputDevice;
  Volume: single;
begin
  // validate CurrentDeviceIndex
  if ((CurrentDeviceIndex < 0) or
      (CurrentDeviceIndex > High(AudioInputProcessor.DeviceList))) then
  begin
    Exit;
  end;

  InputDevice := AudioInputProcessor.DeviceList[CurrentDeviceIndex];
  if not assigned(InputDevice) then
    Exit;

  // set new volume
  Volume := InputDevice.GetVolume() + VolumeChange;
  InputDevice.SetVolume(Volume);
  //DebugWriteln('Volume: ' + floattostr(InputDevice.GetVolume));

  // volume must be polled again 
  NextVolumePollTime := 0;
end;

procedure TScreenOptionsRecord.OnShow;
var
  ChannelIndex: integer;
begin
  inherited;

  // BgMusic distracts too much, pause it
  SoundLib.PauseBgMusic;

  Interaction := 0;

  // create preview sound-buffers
  SetLength(PreviewChannel, MaxChannelCount);
  for ChannelIndex := 0 to High(PreviewChannel) do
    PreviewChannel[ChannelIndex] := TCaptureBuffer.Create();

  SetLength(ChannelPeak, MaxChannelCount);

  UpdateInputDevice();
end;

procedure TScreenOptionsRecord.OnHide;
var
  ChannelIndex: integer;
begin
  StopPreview();

  // free preview buffers
  for ChannelIndex := 0 to High(PreviewChannel) do
    PreviewChannel[ChannelIndex].Free;
  SetLength(PreviewChannel, 0);
  SetLength(ChannelPeak, 0);
end;

procedure TScreenOptionsRecord.StartPreview;
var
  ChannelIndex: integer;
  Device: TAudioInputDevice;
begin
  if ((CurrentDeviceIndex >= 0) and
      (CurrentDeviceIndex <= High(AudioInputProcessor.DeviceList))) then
  begin
    Device := AudioInputProcessor.DeviceList[CurrentDeviceIndex];
    // set preview channel as active capture channel
    for ChannelIndex := 0 to High(Device.CaptureChannel) do
    begin
      PreviewChannel[ChannelIndex].Clear();
      Device.LinkCaptureBuffer(ChannelIndex, PreviewChannel[ChannelIndex]);
      FillChar(ChannelPeak[ChannelIndex], SizeOf(TPeakInfo), 0);
    end;
    Device.Start();
    PreviewDeviceIndex := CurrentDeviceIndex;

    // volume must be polled again
    NextVolumePollTime := 0;
  end;
end;

procedure TScreenOptionsRecord.StopPreview;
var
  ChannelIndex: integer;
  Device: TAudioInputDevice;
begin
  if ((PreviewDeviceIndex >= 0) and
      (PreviewDeviceIndex <= High(AudioInputProcessor.DeviceList))) then
  begin
    Device := AudioInputProcessor.DeviceList[PreviewDeviceIndex];
    Device.Stop;
    for ChannelIndex := 0 to High(Device.CaptureChannel) do
      Device.LinkCaptureBuffer(ChannelIndex, nil);
  end;
  PreviewDeviceIndex := -1;
end;

procedure TScreenOptionsRecord.DrawVolume(x, y, Width, Height: single);
var
  x1, y1, x2, y2: single;
  VolBarInnerWidth: integer;
  Volume: single;
const
  VolBarInnerHSpacing = 2;
  VolBarInnerVSpacing = 1;
begin
  // coordinates for black rect
  x1 := x;
  y1 := y;
  x2 := x1 + Width;
  y2 := y1 + Height;

  // init blend mode
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glEnable(GL_BLEND);

  // draw black background-rect
  glColor4f(0, 0, 0, 0.8);
  glBegin(GL_QUADS);
    glVertex2f(x1, y1);
    glVertex2f(x2, y1);
    glVertex2f(x2, y2);
    glVertex2f(x1, y2);
  glEnd();

  VolBarInnerWidth := Trunc(Width - 2*VolBarInnerHSpacing);

  // TODO: if no volume is available, show some info (a blue bar maybe)
  if (SourceVolume >= 0) then
    Volume := SourceVolume
  else
    Volume := 0;

  // coordinates for first half of the volume bar
  x1 := x + VolBarInnerHSpacing;
  x2 := x1 + VolBarInnerWidth * Volume;
  y1 := y1 + VolBarInnerVSpacing;
  y2 := y2 - VolBarInnerVSpacing;

  // draw volume-bar
  glBegin(GL_QUADS);
    // draw volume bar
    glColor3f(0.4, 0.3, 0.3);
    glVertex2f(x1, y1);
    glVertex2f(x1, y2);
    glColor3f(1, 0.1, 0.1);
    glVertex2f(x2, y2);
    glVertex2f(x2, y1);
  glEnd();

  { not needed anymore
  // coordinates for separator
  x1 := x + VolBarInnerHSpacing;
  x2 := x1 + VolBarInnerWidth;

  // draw separator
  glBegin(GL_LINE_STRIP);
    glColor4f(0.1, 0.1, 0.1, 0.2);
    glVertex2f(x1,        y2);
    glColor4f(0.4, 0.4, 0.4, 0.2);
    glVertex2f((x1+x2)/2, y2);
    glColor4f(0.1, 0.1, 0.1, 0.2);
    glVertex2f(x2,        y2);
  glEnd();
  }

  glDisable(GL_BLEND);
end;

procedure TScreenOptionsRecord.DrawVUMeter(const State: TDrawState; x, y, Width, Height: single);
var
  x1, y1, x2, y2: single;
  Volume, PeakVolume: single;
  Delta: single;
  VolBarInnerWidth: integer;
const
  VolBarInnerHSpacing = 2;
  VolBarInnerVSpacing = 1;
begin
  // coordinates for black rect
  x1 := x;
  y1 := y;
  x2 := x1 + Width;
  y2 := y1 + Height;

  // init blend mode
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glEnable(GL_BLEND);

  // draw black background-rect
  glColor4f(0, 0, 0, 0.8);
  glBegin(GL_QUADS);
    glVertex2f(x1, y1);
    glVertex2f(x2, y1);
    glVertex2f(x2, y2);
    glVertex2f(x1, y2);
  glEnd();

  VolBarInnerWidth := Trunc(Width - 2*VolBarInnerHSpacing);

  // vertical positions
  y1 := y1 + VolBarInnerVSpacing;
  y2 := y2 - VolBarInnerVSpacing;

  // coordinates for bevel
  x1 := x + VolBarInnerHSpacing;
  x2 := x1 + VolBarInnerWidth;

  glBegin(GL_QUADS);
    Volume := PreviewChannel[State.ChannelIndex].MaxSampleVolume();

    // coordinates for volume bar
    x1 := x + VolBarInnerHSpacing;
    x2 := x1 + VolBarInnerWidth * Volume;

    // draw volume bar
    glColor3f(State.RD, State.GD, State.BD);
    glVertex2f(x1, y1);
    glVertex2f(x1, y2);
    glColor3f(State.R, State.G, State.B);
    glVertex2f(x2, y2);
    glVertex2f(x2, y1);

    Delta := (SDL_GetTicks() - ChannelPeak[State.ChannelIndex].Time)/1000;
    PeakVolume := ChannelPeak[State.ChannelIndex].Volume - Delta*Delta*PeakDecay;

    // determine new peak-volume
    if (Volume > PeakVolume) then
    begin
      PeakVolume := Volume;
      ChannelPeak[State.ChannelIndex].Volume := Volume;
      ChannelPeak[State.ChannelIndex].Time := SDL_GetTicks();
    end;

    x1 := x + VolBarInnerHSpacing + VolBarInnerWidth * PeakVolume;
    x2 := x1 + 2;

    // draw peak
    glColor3f(0.8, 0.8, 0.8);
    glVertex2f(x1, y1);
    glVertex2f(x1, y2);
    glVertex2f(x2, y2);
    glVertex2f(x2, y1);

    // draw threshold
    x1 := x + VolBarInnerHSpacing;
    x2 := x1 + VolBarInnerWidth * IThresholdVals[Ini.ThresholdIndex];

    glColor4f(0.3, 0.3, 0.3, 0.6);
    glVertex2f(x1, y1);
    glVertex2f(x1, y2);
    glVertex2f(x2, y2);
    glVertex2f(x2, y1);
  glEnd();

  glDisable(GL_BLEND);
end;

procedure TScreenOptionsRecord.DrawPitch(const State: TDrawState; x, y, Width, Height: single);
var
  x1, y1, x2, y2: single;
  i: integer;
  ToneBoxWidth: real;
  ToneString: string;
  ToneStringWidth, ToneStringHeight: real;
  ToneStringMaxWidth: real;
  ToneStringCenterXOffset: real;
const
  PitchBarInnerHSpacing = 2;
  PitchBarInnerVSpacing = 1;
begin
  // calc tone pitch
  PreviewChannel[State.ChannelIndex].AnalyzeBuffer();

  // coordinates for black rect
  x1 := x;
  y1 := y;
  x2 := x + Width;
  y2 := y + Height;

  // init blend mode
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glEnable(GL_BLEND);

  // draw black background-rect
  glColor4f(0, 0, 0, 0.8);
  glBegin(GL_QUADS);
    glVertex2f(x1, y1);
    glVertex2f(x2, y1);
    glVertex2f(x2, y2);
    glVertex2f(x1, y2);
  glEnd();

  // coordinates for tone boxes
  ToneBoxWidth := Width / NumHalftones;
  y1 := y1 + PitchBarInnerVSpacing;
  y2 := y2 - PitchBarInnerVSpacing;

  glBegin(GL_QUADS);
    // draw tone boxes
    for i := 0 to NumHalftones-1 do
    begin
      x1 := x + i * ToneBoxWidth + PitchBarInnerHSpacing;
      x2 := x1 + ToneBoxWidth - 2*PitchBarInnerHSpacing;

      if ((PreviewChannel[State.ChannelIndex].ToneValid) and
          (PreviewChannel[State.ChannelIndex].ToneAbs = i)) then
      begin
        // highlight current tone-pitch
        glColor3f(1, i / (NumHalftones-1), 0)
      end
      else
      begin
        // grey other tone-pitches
        glColor3f(0.3, i / (NumHalftones-1) * 0.3, 0);
      end;

      glVertex2f(x1, y1);
      glVertex2f(x2, y1);
      glVertex2f(x2, y2);
      glVertex2f(x1, y2);
    end;
  glEnd();

  glDisable(GL_BLEND);

  ///
  // draw the name of the tone
  ///////

  ToneString := PreviewChannel[State.ChannelIndex].ToneString;
  ToneStringHeight := ChannelBarsTotalHeight;

  // initialize font
  // TODO: what about reflection, italic etc.?
  SetFontSize(ToneStringHeight);

  // center
  // Note: for centering let us assume that G#4 has the max. horizontal extent
  ToneStringWidth := glTextWidth(ToneString);
  ToneStringMaxWidth := glTextWidth('G#4');
  ToneStringCenterXOffset := (ToneStringMaxWidth-ToneStringWidth) / 2;

  // draw
  SetFontPos(x-ToneStringWidth-ToneStringCenterXOffset, y-ToneStringHeight/2);
  glColor3f(0, 0, 0);
  glPrint(ToneString);
end;

function TScreenOptionsRecord.Draw: boolean;
var
  Device: TAudioInputDevice;
  DeviceCfg: PInputDeviceConfig;
  SelectSlide: TSelectSlide;
  BarXOffset, BarYOffset, BarWidth: real;
  ChannelIndex: integer;
  State: TDrawState;
begin
  DrawBG;
  DrawFG;

  if ((PreviewDeviceIndex >= 0) and
      (PreviewDeviceIndex <= High(AudioInputProcessor.DeviceList))) then
  begin
    Device := AudioInputProcessor.DeviceList[PreviewDeviceIndex];
    DeviceCfg := @Ini.InputDeviceConfig[Device.CfgIndex];

    // update source volume
    if (SDL_GetTicks() >= NextVolumePollTime) then
    begin
      NextVolumePollTime := SDL_GetTicks() + 500; // next poll in 500ms
      SourceVolume := Device.GetVolume();
    end;

    // get source select slide
    SelectSlide := SelectsS[SelectInputSourceID];
    BarXOffset := SelectSlide.TextureSBG.X;
    BarYOffset := SelectSlide.TextureSBG.Y + SelectSlide.TextureSBG.H + BarUpperSpacing;
    BarWidth   := SelectSlide.TextureSBG.W;
    DrawVolume(SelectSlide.TextureSBG.X, BarYOffset, BarWidth, BarHeight);

    for ChannelIndex := 0 to High(Device.CaptureChannel) do
    begin
      // load player color mapped to current input channel
      if (DeviceCfg.ChannelToPlayerMap[ChannelIndex] <> CHANNEL_OFF) then
      begin
        // set mapped channel to corresponding player-color
        LoadColor(State.R, State.G, State.B, 'P'+ IntToStr(DeviceCfg.ChannelToPlayerMap[ChannelIndex]) + 'Dark');
      end
      else
      begin
        // set non-mapped channel to white
        State.R := 1; State.G := 1; State.B := 1;
      end;

      // dark player colors
      State.RD := 0.2 * State.R;
      State.GD := 0.2 * State.G;
      State.BD := 0.2 * State.B;

      // channel select slide
      SelectSlide := SelectsS[SelectSlideChannelID[ChannelIndex]];

      BarXOffset := SelectSlide.TextureSBG.X;
      BarYOffset := SelectSlide.TextureSBG.Y + SelectSlide.TextureSBG.H + BarUpperSpacing;
      BarWidth   := SelectSlide.TextureSBG.W;

      State.ChannelIndex := ChannelIndex;

      DrawVUMeter(State, BarXOffset, BarYOffset, BarWidth, BarHeight);
      DrawPitch(State, BarXOffset, BarYOffset+BarHeight, BarWidth, BarHeight);
    end;
  end;

  Result := true;
end;

end.