PlayMovieDriftGrating.m

% this script do not need the prepared movie text.
% Niki 2016/4/1

clear
clc

NumStim = 10;
StimDuration = 2;% seconds
ITI = 1;

TriggerWidth = 60; % pixel size of Trigger Stingal (a white square on the bottom right corner on the screen)
TriggerDuration = 1; % seconds

trial_onset = cumsum(rand(NumStim,1)+ITI+StimDuration)-StimDuration+TriggerDuration;
try
    
    % Screen('Preference', 'SkipSyncTests', 1);
    % This script calls Psychtoolbox commands available only in OpenGL-based
    % versions of the Psychtoolbox. (So far, the OS X Psychtoolbox is the
    % only OpenGL-base Psychtoolbox.)  The Psychtoolbox command AssertPsychOpenGL will issue
    % an error message if someone tries to execute this script on a computer without
    % an OpenGL Psychtoolbox
    AssertOpenGL;
    
    % Get the list of screens and choose the one with the highest screen number.
    % Screen 0 is, by definition, the display with the menu bar. Often when
    % two monitors are connected the one without the menu bar is used as
    % the stimulus display.  Chosing the display with the highest dislay number is
    % a best guess about where you want the stimulus displayed.
    screens=Screen('Screens');
    screenNumber=max(screens);
    
    % Find the color values which correspond to white and black: Usually
    % black is always 0 and white 255, but this rule is not true if one of
    % the high precision framebuffer modes is enabled via the
    % PsychImaging() commmand, so we query the true values via the
    % functions WhiteIndex and BlackIndex:
    white=WhiteIndex(screenNumber);
    black=BlackIndex(screenNumber);
    
    % Round gray to integral number, to avoid roundoff artifacts with some
    % graphics cards:
    gray=round((white+black)/2);
    
    % This makes sure that on floating point framebuffers we still get a
    % well defined gray. It isn't strictly neccessary in this demo:
    if gray == white
        gray=white / 2;
    end
    
    % Open a double buffered fullscreen window and select a gray background
    % color:
    [w, screenRect]=Screen('OpenWindow',screenNumber, black);
        
    frameRate=Screen('FrameRate',screenNumber);
    % If MacOSX does not know the frame rate the 'FrameRate' will return 0.
    % That usually means we run on a flat panel with 60 Hz fixed refresh
    % rate:
    if frameRate == 0
        frameRate=60;
    end
    
    load DriftGrating tex
    texframes = size(tex,3);
    texture = nan(1,texframes);
    for i=1:texframes
        texture(i) = Screen('MakeTexture', w, tex(:,:,i));
    end
        
    
    TriggerFrames = TriggerDuration * frameRate;
    % right bottom:
    %TriggerRect = [screenRect([3,4])-TriggerWidth, screenRect([3,4])]';
    % right top:
    TriggerRect = [screenRect(3)-TriggerWidth, screenRect([2,3]), TriggerWidth]';
        
    totalframes = StimDuration*frameRate;
    frame_onset = nan(totalframes,1);
    
    
    clear Duration repetition BarWidth MoveDirection screenRect frameRate tex
    
    % waitframes = 1 means: Redraw every monitor refresh. If your GPU is
    % not fast enough to do this, you can increment this to only redraw
    % every n'th refresh. All animation paramters will adapt to still
    % provide the proper grating. However, if you have a fine grating
    % drifting at a high speed, the refresh rate must exceed that
    % "effective" grating speed to avoid aliasing artifacts in time, i.e.,
    % to make sure to satisfy the constraints of the sampling theorem
    % (See Wikipedia: "Nyquist?Shannon sampling theorem" for a starter, if
    % you don't know what this means):
    waitframes = 1;
    % Query duration of one monitor refresh interval:
    ifi=Screen('GetFlipInterval', w);
    % Translate frames into seconds for screen update interval:
    waitduration = (waitframes - 0.5) * ifi;
    
    HideCursor
    ListenChar(2) % suppress input from keybroad to appear in the command window or script

    while 1
        WaitSecs(0.2);
        [~, ~, keyCode] = KbCheck();
        if any(strcmp(KbName(keyCode), {'ESCAPE','Escape','ESC','esc'}))
            ListenChar(1)
            sca;
            return;
        elseif any(strcmp(KbName(keyCode), {'space','s'}))
            break
        end
    end
        
    % Draw the 1st frame:
    % draw background, comment if use black as background:
    %Screen('Fillrect', w, gray);
    
    
    
    Screen('Fillrect', w, white, TriggerRect);
    % Perform initial Flip to sync us to the VBL and for getting an initial
    % VBL-Timestamp as timing baseline for our redraw loop:
    vbl=Screen('Flip', w);
    vbl=Screen('Flip', w, vbl+TriggerDuration);
    
    % Animation loop:
    for i=1:totalframes
        % Draw image:
        Screen('DrawTexture', w, texture(mod(i-1,texframes)+1))
        if i<=TriggerFrames
            Screen('Fillrect', w, white, TriggerRect);
        end
        
        % Screen('DrawText', w, [num2str(i_rep), num2str(frameRate)],10 );
        
        % Flip 'waitframes' monitor refresh intervals after last redraw.
        % Providing this 'when' timestamp allows for optimal timing
        % precision in stimulus onset, a stable animation framerate and at
        % the same time allows the built-in "skipped frames" detector to
        % work optimally and report skipped frames due to hardware
        % overload:
        [vbl, frame_onset(i)]= Screen('Flip', w, vbl + waitduration);
        %[~, onset(i)]= Screen('Flip', w);
    end
    
    Priority(0);
    
    % Close all textures. This is not strictly needed, as
    % Screen('CloseAll') would do it anyway. However, it avoids warnings by
    % Psychtoolbox about unclosed textures. The warnings trigger if more
    % than 10 textures are open at invocation of Screen('CloseAll') and we
    % have 12 textues here:
    Screen('Close');
    
    % Close window:
    Screen('CloseAll');
    ListenChar(1);
    ShowCursor;
    difonset = diff(frame_onset(:));
    plot(difonset);
    title(['total duration: ' num2str(range(frame_onset(:)))])
    
catch
    Screen('CloseAll');
    Priority(0);
    ListenChar(1);
    ShowCursor;
    psychrethrow(psychlasterror);
end %try..catch..