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function ImagingPipelineExternalConsumerTest(cmd, varargin)
% ImagingPipelineExternalConsumerTest - Test code for imaging pipe output redirection.
%
% To proof-of-concept test the imaging pipelines mechanisms to redirect
% final rendered output to an external consumer or video sink, instead of
% displaying in the onscreen window.
%
% This test not really useful for end users, just for internal
% development and debugging. Does not work on all platforms or
% runtimes.
%
% History:
% Mar-2017 mk Written.
global GL;
global w;
global stereomode;
global oldglleft;
global oldglright;
global curtex;
global leftTextures;
global rightTextures;
if nargin > 0
if cmd == 0
ProducerConsumer(varargin{:});
return;
end
if cmd == 1
ReleaseProducer;
return;
end
if cmd == 2
PassiveConsumer;
return;
end
end
PsychDefaultSetup(2);
close all;
%InitializeMatlabOpenGL;
Screen('Preference', 'ConserveVRAM', 524288);
Screen('Preference', 'SkipSyncTests', 2);
Screen('Preference', 'Verbosity', 5);
injectexternal = 1;
multisample = 0;
stereomode = 12;
doGamma = 0;
doPost = 0;
imagingmode = kPsychNeedFinalizedFBOSinks + kPsychSinkIsMSAACapable;
if injectexternal
imagingmode = imagingmode + kPsychUseExternalSinkTextures;
end
PsychImaging('PrepareConfiguration');
PsychImaging('AddTask', 'General', 'UseVirtualFramebuffer');
%PsychImaging('AddTask', 'General', 'UseDisplayRotation', 90);
%PsychImaging('AddTask', 'General', 'UsePanelFitter', [200 200], 'Centered');
% Sample image processing step:
if doGamma
if stereomode == 0
PsychImaging('AddTask', 'FinalFormatting', 'DisplayColorCorrection', 'SimpleGamma');
else
PsychImaging('AddTask', 'LeftView', 'DisplayColorCorrection', 'SimpleGamma');
PsychImaging('AddTask', 'RightView', 'DisplayColorCorrection', 'SimpleGamma');
end
end
% Sample post processing step:
if doPost
PsychImaging('AddTask', 'General', 'EnablePseudoGrayOutput');
end
[w, wrect] = PsychImaging('Openwindow', 0, 0.5, [0 0 300 300], [], [], stereomode, multisample, imagingmode);
% Sample setup code for external consumer creating/providing the
% backing textures as a triple-buffered texture swapchain:
if injectexternal
% Attach 1st buffer as initial render buffer:
curtex = 0;
[oldglleft, oldglright, target, format, multisample, width, height] = Screen('Hookfunction', w, 'GetDisplayBufferTextures');
% Create triple-buffer textures as swapchain:
leftTextures = glGenTextures(3);
for i=1:3
glBindTexture(target, leftTextures(i));
if target ~= GL.TEXTURE_2D_MULTISAMPLE
glTexParameteri(target, GL.TEXTURE_MIN_FILTER, GL.NEAREST);
glTexParameteri(target, GL.TEXTURE_MAG_FILTER, GL.NEAREST);
glTexImage2D(target, 0, format, width, height, 0, GL.RGBA, GL.UNSIGNED_BYTE, 0);
else
glTexImage2DMultisample(target, multisample, format, width, height, 1);
end
end
glBindTexture(target, 0);
if stereomode > 0
rightTextures = glGenTextures(3);
for i=1:3
glBindTexture(target, rightTextures(i));
if target ~= GL.TEXTURE_2D_MULTISAMPLE
glTexParameteri(target, GL.TEXTURE_MIN_FILTER, GL.NEAREST);
glTexParameteri(target, GL.TEXTURE_MAG_FILTER, GL.NEAREST);
glTexImage2D(target, 0, format, width, height, 0, GL.RGBA, GL.UNSIGNED_BYTE, 0);
else
glTexImage2DMultisample(target, multisample, format, width, height, 1);
end
end
glBindTexture(target, 0);
Screen('Hookfunction', w, 'SetDisplayBufferTextures', '', double(leftTextures(curtex + 1)), double(rightTextures(curtex + 1)), target, format, multisample, width, height);
else
Screen('Hookfunction', w, 'SetDisplayBufferTextures', '', double(leftTextures(curtex + 1)), [], target, format, multisample, width, height);
end
if 1
Screen('Hookfunction', w, 'AppendMFunction', 'PreSwapbuffersOperations', 'Snapshotter', 'ImagingPipelineExternalConsumerTest(0, IMAGINGPIPE_FLIPTWHEN, IMAGINGPIPE_FLIPDONTCLEAR, IMAGINGPIPE_FLIPVBLSYNCLEVEL);');
else
Screen('Hookfunction', w, 'AppendMFunction', 'LeftFinalizerBlitChain', 'Snapshotter', 'ImagingPipelineExternalConsumerTest(0, IMAGINGPIPE_FLIPTWHEN, IMAGINGPIPE_FLIPDONTCLEAR, IMAGINGPIPE_FLIPVBLSYNCLEVEL);');
Screen('Hookfunction', w, 'Enable', 'LeftFinalizerBlitChain');
end
Screen('Hookfunction', w, 'PrependMFunction', 'CloseOnscreenWindowPreGLShutdown', 'ProducerConsumerTearDown', 'ImagingPipelineExternalConsumerTest(1)');
Screen('Hookfunction', w, 'Enable', 'CloseOnscreenWindowPreGLShutdown');
else
Screen('Hookfunction', w, 'AppendMFunction', 'PreSwapbuffersOperations', 'Snapshotter', 'ImagingPipelineExternalConsumerTest(2)');
end
Screen('Hookfunction', w, 'Enable', 'PreSwapbuffersOperations');
if doGamma && stereomode > 0
PsychColorCorrection('SetEncodingGamma', w, 1/2.8, 'LeftView');
PsychColorCorrection('SetEncodingGamma', w, 1/0.5, 'RightView');
end
winfo = Screen('GetWindowInfo', w)
Screen('SelectStereoDrawBuffer', w, 0);
Screen('FillOval', w, [1 0 0]);
DrawFormattedText(w, 'Left', 'center', 'center', [1 1 0]);
dl = Screen('GetImage', w, [], 'drawBuffer');
if stereomode > 0
Screen('SelectStereoDrawBuffer', w, 1);
Screen('FillOval', w, [0 1 0]);
DrawFormattedText(w, 'Right', 'center', 'center', [1 1 0]);
dr = Screen('GetImage', w, [], 'drawBuffer');
end
Screen('Flip', w, [], 0);
KbStrokeWait;
while ~KbCheck
Screen('SelectStereoDrawBuffer', w, 0);
Screen('FillOval', w, [1 0 0]);
DrawFormattedText(w, sprintf('%0.3f', GetSecs), 'center', 'center', [1 1 0]);
if stereomode > 0
Screen('SelectStereoDrawBuffer', w, 1);
Screen('FillOval', w, [0 1 0]);
DrawFormattedText(w, sprintf('%0.3f', GetSecs), 'center', 'center', [1 1 0]);
end
Screen('Flip', w, GetSecs + 0.001, [], round(mod(GetSecs, 2)));
end
if stereomode > 0
bl = Screen('GetImage', w, [0 0 300 300], 'backLeftBuffer');
br = Screen('GetImage', w, [0 0 300 300], 'backRightBuffer');
else
bl = Screen('GetImage', w, [0 0 300 300], 'backBuffer');
end
sca;
figure;
imshow(dl);
title('Left drawBuffer drawBufferFBO[0]');
if stereomode > 0
figure;
imshow(dr);
title('Right drawBuffer drawBufferFBO[1]');
end
figure;
imshow(bl);
title('Back left buffer - finalizedFBO[0]');
if stereomode > 0
figure;
imshow(br);
title('Back right buffer - finalizedFBO[1]');
end
end
function PassiveConsumer
global GL;
global w;
[glleft, glright, target, format, multisample, width, height] = Screen('Hookfunction', w, 'GetDisplayBufferTextures')
glEnable(GL.TEXTURE_2D);
glBindTexture(GL.TEXTURE_2D, glleft);
% pixels = glGetTexImage(GL.TEXTURE_2D, 0, GL.RGBA, GL.UNSIGNED_BYTE);
% fbo = glGetIntegerv(GL.DRAW_FRAMEBUFFER_BINDING)
glBegin(GL.QUADS);
glColor4f(1,1,1,1);
glTexCoord2f(0,1);
glVertex2i(0,0);
glTexCoord2f(1,1);
glVertex2i(width,0);
glTexCoord2f(1,0);
glVertex2i(width,height);
glTexCoord2f(0,0);
glVertex2i(0,height);
glEnd();
glBindTexture(GL.TEXTURE_2D, 0);
glDisable(GL.TEXTURE_2D);
% imshow(squeeze(pixels(2, :, :))');
end
function ProducerConsumer(when, dontclear, synclevel)
global GL;
global w;
global stereomode;
global curtex;
global leftTextures;
global rightTextures;
if nargin >= 3
fprintf('synclevel %i : dontclear=%i : tWhen = %f secs.\n', synclevel, dontclear, when);
end
% Advance to next buffer in swapchain:
curtex = mod(curtex + 1, length(leftTextures));
% Dequeue old texture with brand-new rendered content, enqueue next idle buffer in chain:
fbo1 = glGetIntegerv(GL.DRAW_FRAMEBUFFER_BINDING)
if stereomode > 0
[glleft, glright, target, format, multisample, width, height] = Screen('Hookfunction', w, 'SetDisplayBufferTextures', [], double(leftTextures(curtex + 1)), double(rightTextures(curtex + 1)))
else
[glleft, glright, target, format, multisample, width, height] = Screen('Hookfunction', w, 'SetDisplayBufferTextures', [], double(leftTextures(curtex + 1)))
end
if target == GL.TEXTURE_2D_MULTISAMPLE
% Can not handle MSAA textures with fixed function pipeline.
return;
end
glEnable(GL.TEXTURE_2D);
glBindTexture(GL.TEXTURE_2D, glleft);
% pixels = glGetTexImage(GL.TEXTURE_2D, 0, GL.RGBA, GL.UNSIGNED_BYTE);
fbo2 = glGetIntegerv(GL.DRAW_FRAMEBUFFER_BINDING)
glBindFramebuffer(GL.DRAW_FRAMEBUFFER, 0);
glBegin(GL.QUADS);
glColor4f(1,1,1,1);
glTexCoord2f(0,1);
glVertex2i(0,0);
glTexCoord2f(1,1);
glVertex2i(width,0);
glTexCoord2f(1,0);
glVertex2i(width,height);
glTexCoord2f(0,0);
glVertex2i(0,height);
glEnd();
if stereomode > 0
glBindTexture(GL.TEXTURE_2D, glright);
glBegin(GL.QUADS);
glColor4f(1,1,1,1);
glTexCoord2f(0,1);
glVertex2i(width/2,height/2);
glTexCoord2f(1,1);
glVertex2i(width,height/2);
glTexCoord2f(1,0);
glVertex2i(width,height);
glTexCoord2f(0,0);
glVertex2i(width/2,height);
glEnd();
end
glBindTexture(GL.TEXTURE_2D, 0);
glDisable(GL.TEXTURE_2D);
% imshow(squeeze(pixels(2, :, :))');
end
function ReleaseProducer
global GL;
global w;
global stereomode;
global oldglleft;
global oldglright;
global leftTextures;
global rightTextures;
% Reattach old backing textures, so it can get properly destroyed during pipeline shutdown:
Screen('Hookfunction', w, 'SetDisplayBufferTextures', '', oldglleft, oldglright);
% Delete our swapchain textures:
glDeleteTextures(length(leftTextures), leftTextures);
if stereomode > 0
glDeleteTextures(length(leftTextures), leftTextures);
end
end
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