StartPTB.m

function [ PTB ] = StartPTB( DataStruct )

%% Audio

% Perform basic initialization of the sound driver:
InitializePsychSound(1);

% Close the audio device:
PsychPortAudio('Close')

% Playback device initialization
PTB.Playback_pahandle = PsychPortAudio('Open', [],...
    DataStruct.Parameters.Audio.Playback_Mode,...
    DataStruct.Parameters.Audio.Playback_LowLatencyMode,...
    DataStruct.Parameters.Audio.Playback_freq,...
    DataStruct.Parameters.Audio.Playback_Channels);


%% Video


% Shortcut
Video = DataStruct.Parameters.Video;

% Use GStreamer : for videos
Screen('Preference', 'OverrideMultimediaEngine', 1);

% PTB opening screen will be empty = black screen
Screen('Preference', 'VisualDebugLevel', 1);

% Open PTB display window
switch DataStruct.WindowedMode
    case 'Off'
        WindowRect = [];
    case 'On'
        factor = 0.5;
        [ScreenWidth, ScreenHeight]=Screen('WindowSize', Video.ScreenMode);
        SmallWindow = ScaleRect( [0 0 ScreenWidth ScreenHeight] , factor , factor );
        WindowRect = CenterRectOnPoint( SmallWindow , ScreenWidth/2 , ScreenHeight/2 );
    otherwise
end

color_depth = []; % bit, only assigna specific value for backward compatibility
multisample = 4; % samples for anti-aliasing

try
    [PTB.wPtr,PTB.wRect] = Screen('OpenWindow',Video.ScreenMode,Video.ScreenBackgroundColor,WindowRect,color_depth,[],[],multisample);
catch err
    disp(err)
    Screen('Preference', 'SkipSyncTests', 1)
    [PTB.wPtr,PTB.wRect] = Screen('OpenWindow',Video.ScreenMode,Video.ScreenBackgroundColor,WindowRect,color_depth,[],[],multisample);
end

% Set max priority
PTB.oldLevel         = Priority();
PTB.maxPriorityLevel = MaxPriority( PTB.wPtr );
PTB.newLevel         = Priority( PTB.maxPriorityLevel );

% Refresh time of the monitor
PTB.slack = Screen('GetFlipInterval', PTB.wPtr)/2;
PTB.IFI   = Screen('GetFlipInterval', PTB.wPtr);
PTB.FPS   = Screen('FrameRate', PTB.wPtr);

% Set up alpha-blending for smooth (anti-aliased) lines and alpha-blending
% (transparent background textures)
% Screen('BlendFunction', PTB.wPtr, 'GL_SRC_ALPHA', 'GL_ONE_MINUS_SRC_ALPHA');

% Center
[ PTB.CenterH , PTB.CenterV ] = RectCenter( PTB.wRect );

% B&W colors
PTB.Black = BlackIndex( PTB.wPtr );
PTB.White = WhiteIndex( PTB.wPtr );

% Text
Screen('TextSize' , PTB.wPtr, DataStruct.Parameters.Text.Size);
Screen('TextFont' , PTB.wPtr, DataStruct.Parameters.Text.Font);
Screen('TextColor', PTB.wPtr, DataStruct.Parameters.Text.Color);


%% Warm up

PsychPortAudio('FillBuffer',PTB.Playback_pahandle,zeros(2,1e3));
PsychPortAudio('Start',PTB.Playback_pahandle,[],[],1);

GetSecs;
KbCheck;
Screen('Flip',PTB.wPtr);
WaitSecs(0.100);


%% Echo in command window

disp('---------------------');
disp(['--- ' mfilename ' done ---']);
disp('---------------------');
disp(' ');


end