/usr/share/psychtoolbox-3/PsychHardware/BrightSideDisplay/BrightSideHDR.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
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% BrightSideHDR(cmd [, arg1][, arg2]) -- Psychtoolbox interface to
% BrightSide Technologies High Dynamic Range display device.
%
% This function is used to set up and interface with the High Dynamic Range
% display of BrightSide Technologies. It is a Matlab wrapper around lower
% level GLSL Psychtoolbox functions and the low-level BrightSideCore.dll
% MEX-File. You need to have Brightsides DLL's (and the display device)
% installed on your machine for this to work. Without the DLL's this will
% simply crash. See "help BSRuntimeLibs" for information about
% dependencies.
%
% cmd - The command that BrightSideHDR should execute. cmd can be any of
% the following:
%
% Open a window on the HDR display as with Screen('OpenWindow', ...),
% perform all HDR initialization:
%
% [win, winRect] = BrightSideHDR('OpenWindow', screenid, ...);
%
% This will execute Screen('OpenWindow') with all proper parameters,
% followed by BrightSide HDR init routines. It is a completely sufficient
% drop in replacement for Screen('OpenWindow'), accepting and returning
% exactly the same arguments that Screen() would do, adjusting all
% parameters to the constraints of the BrightSideHDR, if necessary.
%
% [win, winRect] = BrightSideHDR('DummyOpenWindow', screenid, ...);
% Same as OpenWindow, but just init a dummy mode that operates on standard
% displays without the Brightside-Libraries - useful for off-site testing.
%
%
% [win, winRect] = BrightSideHDR('RawOpenWindow', screenid, ...);
% Same as DummyOpenWindow, but just init a bare-minimum window on the HDR
% display suitable for playback of previously computed raw framebuffer
% images (see raw capture and replay support below). This will essentially
% open a fullscreen window on the HDR display, with proper window settings
% and identity gamma tables to make sure framebuffer content is passed
% unaltered 1-to-1 to the display. The imaging pipeline is disabled, this
% is a pure "fast replay" mode of content created in a previous session.
%
%
% In most applications you won't ever need to use any of the commands
% below, as PTB does all this stuff automatically behind the scenes...
% Ignore them unless you know what you're doing.
%
% BrightSideHDR('Initialize', win [, dummy]); -- Initialize the BrightSide libraries
% for HDR output into onscreen window 'win'. Onscreen window 'win' must have been
% opened before on a screen which corresponds to the attached High Dynamic Range
% display device. If you set 'dummy' to 1, then we are in emulation mode,
% i.e., we work without invocation of the mex file and without a real HDR
% display. This call will also attach all callback functions to the proper
% hooks for the given onscreen window 'win' inside the Screen() command.
%
% BrightSideHDR('Debuglevel', level); -- Set level of verbosity for
% debugging. The default is zero which means to be silent. A level of 1
% produces some debug output.
%
%
% SUPPORT FOR RAW HDR IMAGE CAPTURE AND REPLAY:
%
% [sourceWin, destWin] = BrightSideHDR('CreateSnapshotBufferPair');
% - Create a pair of offscreen windows useable for "offline" HDR->BrightSide
% conversion. Will create 'sourceWin' as a offscreen window with 32bpc
% float RGBA format, 'destWin' as a offscreenwindow with 8 bpc RGBA format.
% Both windows will have the size of the HDR displays framebuffer.
%
% You can draw into the 'sourceWin' just as you'd do to an onscreen window.
% Then you can call BrightSideHDR('ConvertImageToSnapshotBuffer', destWin,
% sourceWin); to convert the HDR image into a BrightSide formatted image in
% 'destWin'. You can use 'destWin' or its content in the
% BrightSideHDR('BlitRawFramebufferSnapshot') call for quick "replay" of
% HDR content.
%
%
% [rawImg] = BrightSideHDR('ConvertImageToSnapshotBuffer', destWin, sourceWin);
% - Convert HDR image in offscreen window 'sourceWin' into a HDR
% useable raw image in offscreen window 'destWin'. Optionally return a
% Matlab uint8 RGB image matrix with the raw data as 1st return argument
% rawImg.
%
% You could save 'rawImg' to disk and later load it and "replay" it on the
% HDR display via calls to BrightSideHDR('BlitRawFramebufferSnapshot',
% sourceWin);
%
%
% rawSnapshotMatrix = BrightSideHDR('GetRawFramebufferSnapshot');
% -Call immediately after Screen('Flip'). This will create a "screenshot" of the
% framebuffer for the currently displaying HDR image and return a Matlab
% matrix with proper raw framebuffer data, formatted for the HDR display.
% Can be used to Screen('MakeTexture') a texture that you can blit into the
% framebuffer via BrightSideHDR('BlitRawFramebufferSnapshot') without need
% for expensive conversion at runtime.
%
%
% BrightSideHDR('BlitRawFramebufferSnapshot', sourceWin); Blit the given
% RGB8 or RGBA8 texture or offscreen window into the framebuffer of HDR
% display, so it gets displayed at the next invocation of Screen('Flip').
% The 'sourceWin' must be a texture or offscreen window whose image content
% was previously created by one of the raw snapshotting functions above,
% ie., it must be already encoded in the special data format for BrightSide
% displays.
%
%
% Callbacks: Usually called automatically by Screen(), no need to use them
% in your script directly! Some of them may disappear in the future,
% getting subsumed by Screen()'s internal imaging pipeline.
%
% BrightSideHDR('BrightSideExecuteBlit', win); -- This will convert
% the HDR image content in the HDR backbuffer into the special data
% format needed by the HDR display hardware. This is called by PTB
% automatically, don't call it yourself!
%
% BrightSideHDR('Shutdown'); -- Shut down the HDR device and core library,
% switch PTB back to standard LDR output. This is called by PTB
% automatically, don't call it yourself!
% History:
% 10/30/2006 Initial prototype implementation. MK & Oguz Ahmet Akyuz (Dept. of
% Computer Science, University of Central Florida)
% 11/09/2006 Small fixes and improvements to make it really work. (MK + Oguz)
% 12/12/2006 Integrate initial hook-plugin support for PTB's imaging
% pipeline, so user code does not need to call these functions anymore.
% 12/13/2006 Built-in 'OpenWindow' for simplified setup...
% 06/24/2007 Rewritten to work with current PTB, which has a full
% implementation of the floating point imaging pipeline. (MK)
% 07/05/2007 Bugfixes to rewrite. Improvements. Now its really ready for
% use with the new imaging pipeline. (MK)
% 07/01/2009 Add functions for capturing and replaying HDR framebuffers. (MK)
global GL;
persistent windowPtr;
persistent winwidth;
persistent winheight;
persistent hdrtexid;
persistent fboid;
persistent online;
persistent dummymode;
persistent debuglevel;
persistent oldTextRenderer;
persistent calledfromPsychImaging;
persistent reassign;
% Cold start: Setup our variables to safe defaults.
if isempty(online)
online = 0;
dummymode = 0;
debuglevel = 0;
hdrtexid = 0;
reassign = 1;
calledfromPsychImaging = 0;
end
if nargin < 1 || isempty(cmd)
error('BrightSideHDR: Missing command specification.');
end
% Command dispatcher:
if strcmpi(cmd, 'Debuglevel')
if nargin < 1 || isempty(arg)
error('BrightSideHDR: "Debuglevel" called without specifiying a new level.');
end
debuglevel = arg;
if ~dummymode && online
% Set new debuglevel in core:
BrightSideCore(-1, debuglevel);
end
return;
end
if strcmpi(cmd, 'CalledFromPsychImaging')
% Mark us as being called from PsychImaging:
if nargin < 1 || isempty(arg)
error('BrightSideHDR: "CalledFromPsychImaging" called without specifiying a new level.');
end
calledfromPsychImaging = arg;
return;
end
if strcmpi(cmd, 'OpenWindow') || strcmpi(cmd, 'DummyOpenWindow') || strcmpi(cmd, 'RawOpenWindow') || strcmpi(cmd, 'Initialize')
% OpenGL mode of Psychtoolbox already initialized?
if isempty(GL)
% Nope. Do it now, but don't enable full 3D support, but only
% support for calling MOGL commands, not z-/stencilbuffers and
% context isolation:
InitializeMatlabOpenGL([], [], 1);
end
% Open onscreen window as well or just perform initialization?
if strcmpi(cmd, 'OpenWindow') || strcmpi(cmd, 'DummyOpenWindow') || strcmpi(cmd, 'RawOpenWindow')
% Execute the Screen('OpenWindow') command with proper flags, followed
% by our own Initialization. Return values of 'OpenWindow'.
% BrightSideHDR('OpenWindow', ...) is a drop-in replacement for
% Screen('OpenWindow', ...):
% Assign screen index:
if nargin < 2 || isempty(arg) || ~isa(arg, 'double')
error('BrightSideHDR: "OpenWindow" called without valid screen handle.');
end
screenid = arg;
% Assign optional clear color:
if nargin < 3
clearcolor = [];
else
clearcolor = dummy;
end
% windowRect is always full screen -- Anything else would make the
% HDR display fail.
winRect = [];
% pixelSize is also fixed:
pixelSize = 32;
% Same for double-buffering:
numbuffers = 2;
% stereomode we take, unless raw window requested:
if nargin >= 7 && ~strcmpi(cmd, 'RawOpenWindow')
stereomode = varargin{4};
else
stereomode = [];
end
% multiSample gets overriden for now... Would probably interfere
% with HDR display controller:
multiSample = 0;
% Imaging mode we take - and combine it with our own requirements:
if nargin >= 9
imagingmode = varargin{6};
else
imagingmode = 0;
end
% On a raw "playback only" window, we disable the imaging pipeline
% to avoid interference:
if ~strcmpi(cmd, 'RawOpenWindow')
% Non-Raw: Need pipeline...
% We need at least fast backing store and support for final output
% conversion:
imagingmode = mor(imagingmode, kPsychNeedFastBackingStore, kPsychNeedOutputConversion);
% We require 32 bit floating point framebuffers if user doesn't
% explicitely request the lower resolution, but higher speed 16 bit
% floating point framebuffers:
if bitand(imagingmode, kPsychNeed16BPCFloat) == 0
imagingmode = mor(imagingmode, kPsychNeed32BPCFloat);
end
else
% Raw window: Force pipeline off:
imagingmode = 0;
end
% Open the window, pass all parameters (partially modified or
% overriden), return Screen's return values:
if nargin > 9
[win, winRect] = Screen('OpenWindow', screenid, clearcolor, winRect, pixelSize, numbuffers, stereomode, multiSample, imagingmode, varargin{7:end});
else
[win, winRect] = Screen('OpenWindow', screenid, clearcolor, winRect, pixelSize, numbuffers, stereomode, multiSample, imagingmode);
end
% Ok, if we reach this point then we've got a proper onscreen
% window on the HDR. Let's reassign our arguments and continue with
% the init sequence:
arg = win;
% Operate in dummy mode or real mode?
if strcmpi(cmd, 'DummyOpenWindow') || strcmpi(cmd, 'RawOpenWindow')
dummy = 1;
else
dummy = 0;
end
% Ok, should be safe to continue with standard Brightside init...
end
% BrightSide init sequence:
% Child protection:
if online
error('BrightSideHDR: "Initialize" called on a HDR display already initialized.');
end
if nargin < 2 || isempty(arg) || ~isa(arg, 'double')
error('BrightSideHDR: "Initialize" called without valid HDR onscreen window handle.');
end
if strcmpi(cmd, 'Initialize') && (nargin < 3 || isempty(dummy))
dummymode = 0;
else
dummymode = dummy;
end
% Another bit of child protection:
AssertGLSL;
% Step 1: Make sure we got a window handle for a valid onscreen window:
if isempty(find(Screen('Windows')==arg, 1)) || Screen('WindowKind', arg)~=1
error('BrightSideHDR: "Initialize" called with something else than a valid onscreen window handle.');
end
% Valid handle, assign it and query its dimensions, aka the dimensions
% of our HDR framebuffer:
windowPtr = arg;
[winwidth, winheight] = Screen('WindowSize', windowPtr);
% Only setup the BrightSide drivers and libraries in non-dummy mode:
if ~dummymode
% Initiate loading, linking and initialization of the core:
% On Windows, we need to preload BrightSideCore into Matlab while the working
% directory is set to Psychtoolbox/PsychHardware/BrightSideDisplay/BSRuntimeLibs/outputlib/lib/
% , so the Windows dynamic linker can find our own local copies of the BrightSide DLL's.
% and link against it.
if IsWin
% Windows system: Change working dir to location to BrightSide
% DLL's:
olddir = pwd;
try
% This fails if libraries are not installed, so we
% try-catch it...
cd([PsychtoolboxRoot 'PsychHardware/BrightSideDisplay/BSRuntimeLibs/outputlib/lib']);
catch
fprintf('Could not cd() into the directory %s !\n', [PsychtoolboxRoot 'PsychHardware/BrightSideDisplay/BSRuntimeLibs/outputlib/lib']);
fprintf('This could be a problem with access permissions, but more likely, this directory simply does not exist.\n');
fprintf('After a new installation of Psychtoolbox, you must manually copy the BrightSide runtime libraries into that\n');
fprintf('folder, ie., replace the empty directory .../BSRuntimeLibs/ by the one contained in the zip file with the\n');
fprintf('proprietary Brightside runtime libraries.\n');
fprintf('As of June 2008, in MPI Tuebingen, this zip file can be found in \\\\uni.kyb.local\\home\\kleinerm\\projects\\OpenGLPsychtoolbox\\BrightSideHDRRuntime.zip\n');
fprintf('Check this, then retry...\n');
Screen('CloseAll');
error('BrightSideHDR: The directory with the Brightside runtime drivers is inaccessible or non-existent.');
end
% Preload (and thereby link) BrightSideCore into Matlab. The
% special command code -1 forces loading and sets the initial
% debuglevel:
BrightSideCore(-1, debuglevel);
% Now that it is (hopefully) properly loaded, we can revert the working
% directory to its previous setting:
cd(olddir);
end;
% Startup & Initialize the BrightSideHDR driver library. We pass the
% path to all configuration files and the name of the master
% configuration file to the startup routine.
BrightSideCore(0, [fileparts(which('BrightSideCore')) '/BSRuntimeLibs/Resources'], 'DR-37P-beta.xml');
% Add the BrightSideHDR blitter callback to the final output
% formatter blitchain: This will trigger data conversion at each
% invocation of Screen('Flip'):
Screen('HookFunction', windowPtr, 'AppendMFunction', 'FinalOutputFormattingBlit', 'Execute BrightSide blit operation', 'BrightSideHDR(''BrightSideExecuteBlit'')');
Screen('HookFunction', windowPtr, 'Enable', 'FinalOutputFormattingBlit');
% Load the gfx-hardware gamma-tables / CLUT's with identity, so
% they can't mess with BrightSide encoded image data:
LoadIdentityClut(windowPtr);
end
% Add a shutdown callback - Always called (even in dummy mode) to
% teardown the BrightSide-Lib (if active) and to reset our internal
% data structures:
Screen('HookFunction', windowPtr, 'AppendMFunction', 'CloseOnscreenWindowPreGLShutdown', 'Shutdown BrightSide core before window close.', 'BrightSideHDR(''Shutdown'')');
Screen('HookFunction', windowPtr, 'Enable', 'CloseOnscreenWindowPreGLShutdown');
if ~strcmpi(cmd, 'RawOpenWindow')
% Disable color clamping in the GL pipeline. It's not useful for our
% purpose, unless we are in dummymode. Also set color scaling to 1.0,
% i.e. do not scale color values at all - Doesn't make much sense with
% the BrightSide HDR display.
Screen('ColorRange', windowPtr, 1, 0);
% Eat up all OpenGL errors caused by this:
while glGetError; end;
else
% A raw window for pure playback of previously "recorded" buffers
% still needs a linearized video output to work properly:
% Load the gfx-hardware gamma-tables / CLUT's with identity, so
% they can't mess with BrightSide encoded image data:
LoadIdentityClut(windowPtr);
end
% Use old display list text renderer - The new one is not HDR ready: It
% has a restricted color value range 0.0-1.0 for text colors, which
% will create way too dark text, and its internal use of alpha-blending
% triggers software-fallback in the Geforce 7000 gfx... Thereby, use
% the old and trouble-free one:
oldTextRenderer = Screen('Preference', 'TextRenderer', 0);
% We are online:
online = 1;
% We must skip the following code if called from PsychImaging!
% Reason: PsychImaging will execute this call sequence internally, but
% after setup of its PsychColorCorrection - ie., in a different order.
% The first call to Screen('Flip') will determine which internal FBO is
% the correct source FBO for BrightSide libs, and PsychImaging may
% still change/add/swizzle the order of internal FBO's and imaging
% operations, so it would be too early for us to bind the final source
% FBO, iow. to do the first 'Flip'. If we 'flipped' here, the wrong FBO
% might be permanently bound, thereby preventing proper image
% processing sequence in PsychImaging code:
if ~calledfromPsychImaging
% Set the background clear color via old fullscreen 'FillRect' trick,
% followed by a flip:
Screen('FillRect', windowPtr, clearcolor);
Screen('Flip', win);
end
return;
end
if strcmpi(cmd, 'Shutdown')
% Shutdown command:
% Child protection:
if ~online
warning('BrightSideHDR: "Shutdown" command called, although display is already offline.'); %#ok<WNTAG>
return;
end
% Shutdown BrightSide core and display:
if ~dummymode
BrightSideCore(1);
end
% Restore selection of text renderer:
% TODO FIXME: Technically it is not allowed to call into Screen() from
% within this function as it is called by Screen()'s shutdown path and
% Screen is not reentrant! For some reason it still works. Are we lucky
% or what?!? Leave it for now...
Screen('Preference', 'TextRenderer', oldTextRenderer);
% Reset to preinit state:
hdrtexid = 0;
fboid = 0;
windowPtr = 0;
dummymode = 0;
reassign = 1;
% Shutdown complete, we're offline:
online = [];
return;
end
if strcmpi(cmd, 'BrightSideExecuteBlit')
% Initiate float FBO -> Backbuffer data conversion to convert a HDR
% float image into data format required by BrightSide HDR:
if ~online
error('BrightSideHDR: "BrightSideExecuteBlit" command called, although display is offline.');
end
% If we are still in the PsychImaging setup phase...
if calledfromPsychImaging
% Then turn this call into a no-op!
return;
end
% Disable shaders, if any active:
glUseProgram(0);
% 'hdrtexid' of source color texture already assigned?
if hdrtexid == 0
% No. But the texture currently bound to unit 0 is the proper one,
% so query its id. We know that the texture is bound to the
% rectangle texture target and that unit 0 is active, due to the
% semantics of PTB's imaging pipeline. This subroutine is called
% from the 'OutputFormattingBlit'-Hookchain of Screen('Flip'). Part
% of the hookchain execution sequence is setup of proper source
% textures and target FBOs, so we know the currently bound texture
% is the floating point source texture and the currently bound
% framebuffer is the target framebuffer (FBO or system
% framebuffer):
hdrtexid = double(glGetIntegerv(GL.TEXTURE_BINDING_RECTANGLE_EXT));
fboid = double(glGetIntegerv(GL.FRAMEBUFFER_BINDING_EXT));
if hdrtexid <= 0
error('Fatal error: Failed to query color buffer texture id in BrightSideHDR("BrightSideExecuteBlit")!');
end
if fboid < 0
error('Fatal error: Failed to query Framebuffer object id in BrightSideHDR("BrightSideExecuteBlit")!');
end
% Need to do first-time init of HDR libary with this 'hdrtexid':
needhdrinit = 1;
else
% No need to first-time init HDR library:
needhdrinit = 0;
end
% Execute actual conversion op:
DoExecuteHDRBlit(dummymode, winwidth, winheight, needhdrinit, hdrtexid, fboid);
% Ready:
return;
end
if strcmpi(cmd, 'CreateSnapshotBufferPair')
if ~online
error(sprintf('BrightSideHDR: "%s" command called, although display is offline.', cmd)); %#ok<SPERR>
end
% Create source offscreen window: Has 128 bpp or 32bpc float RGBA
% representation:
srcBuffer = Screen('OpenOffscreenWindow', windowPtr, 0, [], 128, 32);
% Yes. Create a target RGBA8 offscreen window of sufficient size:
dstBuffer = Screen('OpenOffscreenWindow', windowPtr, 0, [], 32, 32);
win = srcBuffer;
winRect = dstBuffer;
return;
end
% Convert a HDR floating point image (inside a texture or offscreen window)
% into an RGBA8 raw image buffer, suitable for directly driving the HDR display.
if strcmpi(cmd, 'ConvertImageToSnapshotBuffer') || strcmpi(cmd, 'GetSnapshotBuffer')
if ~online
error(sprintf('BrightSideHDR: "%s" command called, although display is offline.', cmd)); %#ok<SPERR>
end
% Shall we create a suitable target RGBA8 buffer ourselves?
if strcmpi(cmd, 'GetSnapshotBuffer')
% Yes. Create a RGBA8 offscreen window of sufficient size:
dstBuffer = Screen('OpenOffscreenWindow', windowPtr, 0, [], 32, 32);
if exist('arg', 'var') && ~isempty(arg)
srcBuffer = arg;
else
% No srcBuffer provided:
srcBuffer = [];
end
scmode = 1;
% First return argument will be destination offscreen window handle:
win = dstBuffer;
else
% No. Sanity check and then use the provided handle:
if ~exist('arg', 'var') || isempty(arg)
error(sprintf('BrightSideHDR:%s: Required destinationWindow handle missing!', cmd)); %#ok<SPERR>
end
% Assign dstBuffer handle:
dstBuffer = arg;
% Proper type of destination?
if Screen('WindowKind', dstBuffer) ~= -1
error(sprintf('BrightSideHDR:%s: Invalid destinationWindow handle passed. Not an offscreen window!', cmd)); %#ok<SPERR>
end
% Matching dimensions with display framebuffer?
[w, h] = Screen('WindowSize', dstBuffer);
if w~=winwidth || h~=winheight
error(sprintf('BrightSideHDR:%s: Size of destinationWindow %i x %i pixels doesn''t match size of display %i x %i pixels as required!', cmd, w, h, winwidth, winheight)); %#ok<SPERR>
end
% Check format of destination window: Must be a 8bpc, RGBA8, 32
% bpp:
bpp = Screen('PixelSize', dstBuffer);
if bpp ~= 32
error(sprintf('BrightSideHDR:%s: Pixelsize %i bpp of destinationWindow handle is not the required 32 bpp for a RGBA8 target!', cmd, bpp)); %#ok<SPERR>
end
% Ok, checks passed. Check optional source argument:
if exist('dummy', 'var') && ~isempty(dummy)
% Assign it:
srcBuffer = dummy;
else
% No srcBuffer provided:
srcBuffer = [];
end
scmode = 0;
end
% Extract srcTex texture handle for the RGBA floating point source
% texture for BrightSide conversion:
% srcBuffer provided?
if isempty(srcBuffer)
% No source window provided: We default the srcTex texture id
% to the texture of our regular PTB imaging pipeline
% framebuffer:
srcTex = hdrtexid;
% Make sure pending rendering operations are finished:
Screen('DrawingFinished', windowPtr, [], 1);
else
% Proper type of source?
if Screen('WindowKind', srcBuffer) ~= -1
error(sprintf('BrightSideHDR:%s: Invalid sourceWindow handle passed. Not an offscreen window or texture!', cmd)); %#ok<SPERR>
end
% Matching dimensions with display framebuffer?
[w, h] = Screen('WindowSize', srcBuffer);
if w~=winwidth || h~=winheight
error(sprintf('BrightSideHDR:%s: Size of sourceWindow %i x %i pixels doesn''t match size of display %i x %i pixels as required!', cmd, w, h, winwidth, winheight)); %#ok<SPERR>
end
% srcBuffer is eligible as source window for conversion.
% Extract its OpenGL texture id:
srcTex = Screen('GetOpenGLTexture', windowPtr, srcBuffer);
% Make sure pending rendering operations are finished:
Screen('DrawingFinished', srcBuffer, [], 1);
end
% Need to extract FBO id for dstBuffer of BrightSide conversion:
% The call to 'GetWindowInfo' will as a side effect bind the FBO for dstBuffer:
Screen('GetWindowInfo', dstBuffer);
% Query it:
dstFBOid = double(glGetIntegerv(GL.FRAMEBUFFER_BINDING_EXT));
% Disable shaders, if any active:
glUseProgram(0);
if ~dummymode
% Ok, we have a valid source texture id and destination FBO id. Call
% BrightSideCore to setup the library for conversion between these buffers:
DoExecuteHDRBlit(0, winwidth, winheight, reassign, srcTex, dstFBOid);
else
% In dummymode, DoExecuteHDRBlit() is a no-op, so we need to
% replace it by a plain 1->1 blit:
Screen('CopyWindow', srcBuffer, dstBuffer);
end
% Switch library back to standard source and destination assignment:
if ~dummymode
% MK BUG: reassign should be 1 and the commented out command should be
% used: We should switch back and forth in the assignment of source
% textures and target fbos for the BrightSide library for optimal
% behaviour. However the library doesn't like multiple successive
% switches at all -- The whole beast fails if we try to do it.
% Therefore we perform this assignment only 1 time --> Doesn't
% allow us to switch between offline and online use!
% It is unclear if we encounter a bug in the BrightSide library,
% some Psychtoolbox bug, some coding bug here or a NVidia driver
% bug. We do know however that the BrightSide libs are often
% leaking OpenGl state and are pretty bad and faulty in managing state, so it
% might be a BrightSide bug...
reassign = 0;
% BrightSideCore(3, hdrtexid, fboid);
end
% Ok, now we should have our final BrightSide ready RGB8 framebuffer
% image in dstBuffer. Should we also return a snapshot as Matlab RGB8
% matrix in uint8 format, suitable for later texture creation?
if (scmode && nargout > 1) || (~scmode && nargout > 0)
% Yes. Get "screenshot"
outImg = Screen('GetImage', dstBuffer, [], [], 0, 3);
% Assign to proper return argument:
if scmode
winRect = outImg;
else
win = outImg;
end
end
% Done.
return;
end
if strcmpi(cmd, 'GetRawFramebufferSnapshot')
if ~online
error(sprintf('BrightSideHDR: "%s" command called, although display is offline.', cmd)); %#ok<SPERR>
end
% Retrieve RGB8 uint8 snapshot image matrix of the system frontbuffer
% suitable for creating a raw RGB8 texture for driving the BrightSide
% display without imaging pipeline, kind'a raw playback:
win = Screen('GetImage', windowPtr, [], 'frontBuffer', 0, 3);
% Done.
return;
end
if strcmpi(cmd, 'BlitRawFramebufferSnapshot')
if ~online
error(sprintf('BrightSideHDR: "%s" command called, although display is offline.', cmd)); %#ok<SPERR>
end
if ~exist('arg', 'var') || isempty(arg)
error(sprintf('BrightSideHDR:%s: Mandatory srcWindow handle argument missing!', cmd)); %#ok<SPERR>
end
srcBuffer = arg;
% Proper type of source?
if Screen('WindowKind', srcBuffer) ~= -1
error(sprintf('BrightSideHDR:%s: Invalid sourceWindow handle passed. Not an offscreen window or texture!', cmd)); %#ok<SPERR>
end
% Matching dimensions with display framebuffer?
[w, h] = Screen('WindowSize', srcBuffer);
if w~=winwidth || h~=winheight
error(sprintf('BrightSideHDR:%s: Size of sourceWindow %i x %i pixels doesn''t match size of display %i x %i pixels as required!', cmd, w, h, winwidth, winheight)); %#ok<SPERR>
end
% Make sure that at least the final output formatter is off:
Screen('HookFunction', windowPtr, 'Disable', 'FinalOutputFormattingBlit');
% Perform blit: We use CopyWindow to get an identity blit, possibly
% accelerated via FBO blit extensions on modern hardware:
%Screen('CopyWindow', srcBuffer, windowPtr);
Screen('DrawTexture', windowPtr, srcBuffer, [], [], [], 0);
% We enforce finalization of preflip operations:
Screen('DrawingFinished', windowPtr, [], 1);
% Reenable output formatter if it was active before:
if Screen('HookFunction', windowPtr, 'Query', 'FinalOutputFormattingBlit', 0) ~= -1
Screen('HookFunction', windowPtr, 'Enable', 'FinalOutputFormattingBlit');
end
% Done.
return;
end
% Unknown command.
error('BrightSideHDR: Unknown subcommand specified! Type ''help BrightSideHDR'' for usage info.');
end
% Helper routine: Performs actual library calls to perform HDR -> RGBA8 conversion:
function DoExecuteHDRBlit(dummymode, winwidth, winheight, needhdrinit, mhdrtexid, mfboid)
global GL;
if ~dummymode
% Setup special projection matrices for the BrightSide core lib:
glMatrixMode(GL.PROJECTION);
glPushMatrix;
glLoadIdentity;
% The following gluOrhto2D command causes an OpenGL error, because
% it defines invalid settings, but for some reason we need exactly this
% transformation for the BrightSideHDR to work. Therefore we disable
% automatic error-checking in moglcore, then execute the command, then
% eat up the error-code and then reenable error checking:
% Disable automatic error checking:
moglcore('DEBUGLEVEL', 0);
% Perform the strange setup command:
gluOrtho2D(0, 0, winwidth, winheight);
% Eat up all OpenGL errors caused by this:
while glGetError; end;
% Reenable automatic error checking:
moglcore('DEBUGLEVEL', 1);
glMatrixMode (GL.MODELVIEW);
glPushMatrix;
glLoadIdentity;
% Call the BrightSide core library to do the conversion:
% It is crucial to backup & restore at least the GL_ENABLE_BIT
% state around the call to BrightSides core libraries. They seem to
% change enable-state and don't restore it properly. For that
% reason, we couldn't use unclamped colors when the fixed-function
% pipeline was active, i.e. no shaders bound.
glPushAttrib(GL.ALL_ATTRIB_BITS);
% Would be enough to push this, but better safe than sorry. You never
% know what your software vendor will screw in its next release ;)
% glPushAttrib(GL.ENABLE_BIT);
if needhdrinit == 1
% Setup of source texture and target FBO for HDR -> Framebuffer
% conversion. We do it here because we need the 'hdrtexid' of the
% source color texture, which is only reliably available at first
% invocation of this subroutine. Same for 'fboid' (although
% this will be zero in 99.99% of all PTB applications ;-) )
BrightSideCore(3, mhdrtexid, mfboid);
end
% Perform actual conversion-blit:
BrightSideCore(2);
% Restore saved state:
glPopAttrib;
% Restore normal matrices:
glMatrixMode(GL.PROJECTION);
glPopMatrix;
glMatrixMode (GL.MODELVIEW);
glPopMatrix;
end
return;
end
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