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% Get current clut for use as backup copy later on:
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oldClut = Screen('ReadNormalizedGammaTable', windowPtr);
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% Try to use PsychGPUControl() method to disable display dithering
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% globally on all connected GPUs and displays. As of March 2013, this
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% function is only supported on Linux and Windows with AMD/ATI GPU's,
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% and only when running the proprietary Catalyst display driver.
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% It will no-op silently on other system configurations.
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% We don't use the success status return code of the function, because
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% we don't know how trustworthy it is. Also this only affects dithering,
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% not gamma table identity setup, so the code-pathes below must run anyway
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% for proper setup, even if their dithering disable effect may be redundant.
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PsychGPUControl('SetDitheringEnabled', 0);
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% Ask Screen to use low-level setup code to configure the GPU for
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94
% untampered framebuffer pixel paththrough. This is only supported on a
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95
% subset of GPU's under certain conditions if the PsychtoolboxKernelDriver
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152
% Full blown LUT given:
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if ~isnumeric(lut) | size(lut,1) < 1 | size(lut,2) ~= 3 %#ok<OR2>
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if ~isnumeric(lut) || size(lut,1) < 1 || size(lut,2) ~= 3
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error('LoadIdentityClut: Loaded data from config file is not a valid LUT! Not a numeric matrix or less than 1 row, or not 3 columns!');
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% We derive type of hardware and thereby our strategy from the vendor name:
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gfxhwtype = winfo.GLVendor;
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if ~isempty(strfind(gfxhwtype, 'NVIDIA')) | ~isempty(strfind(gfxhwtype, 'nouveau'))
176
if ~isempty(strfind(gfxhwtype, 'NVIDIA')) || ~isempty(strfind(gfxhwtype, 'nouveau'))
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179
% We start with assumption that it is a "normal" one:
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188
% Is it a Geforce-8000 or later (G80 core or later) and is this OS/X?
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if ~isempty(strfind(winfo.GPUCoreId, 'G80')) & IsOSX %#ok<AND2>
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if ~isempty(strfind(winfo.GPUCoreId, 'G80')) && IsOSX
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190
% 10.5.x Leopard?
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if (osxversion(1) == 10) & (osxversion(2) == 5) & (osxversion(3) >=0) %#ok<AND2>
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if (osxversion(1) == 10) && (osxversion(2) == 5) && (osxversion(3) >=0)
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192
% Yes. One of the releases with an embarassing amount of bugs,
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193
% brought to you by Apple. Need to apply an especially ugly
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194
% clut to force these cards into an identity mapping:
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199
% 10.6.x Snow Leopard or later?
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if (osxversion(1) == 10) & (osxversion(2) >= 6) & (osxversion(3) >=0) %#ok<AND2>
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if (osxversion(1) == 10) && (osxversion(2) >= 6) && (osxversion(3) >=0)
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% Yes. One of the releases with an embarassing amount of bugs,
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202
% brought to you by Apple. Need to apply an especially ugly
191
203
% clut to force these cards into an identity mapping:
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223
fprintf('LoadIdentityClut: NVidia Quadro or later on Linux with binary Blob detected. Enabling special type-III LUT.\n');
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if ~isempty(strfind(gfxhwtype, 'ATI')) | ~isempty(strfind(gfxhwtype, 'AMD')) | ~isempty(strfind(gfxhwtype, 'Advanced Micro Devices')) | ...
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~isempty(strfind(winfo.GLRenderer, 'DRI R')) | ~isempty(strfind(winfo.GLRenderer, 'on ATI R')) %#ok<OR2>
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if ~isempty(strfind(gfxhwtype, 'ATI')) || ~isempty(strfind(gfxhwtype, 'AMD')) || ~isempty(strfind(gfxhwtype, 'Advanced Micro Devices')) || ...
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~isempty(strfind(winfo.GLRenderer, 'DRI R')) || ~isempty(strfind(winfo.GLRenderer, 'on ATI R'))
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% A good default at least on OS/X is type 1:
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if (IsWin | IsLinux) & ~isempty(strfind(winfo.GPUCoreId, 'R600')) %#ok<OR2,AND2>
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if (IsWin || IsLinux) && ~isempty(strfind(winfo.GPUCoreId, 'R600'))
222
234
% At least the Radeon HD 3470 under Windows Vista and Linux needs type 0
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% LUT's. Let's assume for the moment this is true for all R600
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236
% cores, ie., all Radeon HD series cards.
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237
fprintf('LoadIdentityClut: ATI Radeon HD-2000 or later detected. Enabling special type-0 LUT hacks for totally broken drivers.\n');
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elseif (IsLinux) & (~isempty(strfind(winfo.GLRenderer, 'DRI R')) | ~isempty(strfind(winfo.GLRenderer, 'on ATI R'))) %#ok<OR2,AND2>
239
elseif (IsLinux) && (~isempty(strfind(winfo.GLRenderer, 'DRI R')) || ~isempty(strfind(winfo.GLRenderer, 'on ATI R')))
228
240
% At least the Radeon R3xx/4xx/5xx under Linux with DRI2 Mesa needs type 0
229
241
% LUT's. Let's assume for the moment this is true for all R600
230
242
% cores, ie., all Radeon HD series cards.
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283
oldClut = Screen('LoadNormalizedGammaTable', windowPtr, ((1/256:1/256:1)' * ones(1, 3)), loadOnNextFlip);
274
if gfxhwtype == 2 & IsOSX %#ok<AND2>
286
if gfxhwtype == 2 && IsOSX
275
287
% This works on OS/X 10.5 with NVidia GeForce 8800. It is an ugly hack
276
288
% to compensate for the absolutely horrible, embarassing bugs in Apple's NVidia
277
289
% graphics drivers and their clut handling. Does this company still
285
297
oldClut = Screen('LoadNormalizedGammaTable', windowPtr, loadlut, loadOnNextFlip);
288
if gfxhwtype == 3 & IsOSX %#ok<AND2>
300
if gfxhwtype == 3 && IsOSX
289
301
% This works on OS/X 10.6.0 with NVidia Geforce-9200M according to CRS
290
302
% and with 10.6.0 with Geforce-8800 in the MacPro according to
291
303
% me. We assume this works on all G80 et al. GPU's:
300
312
oldClut = Screen('LoadNormalizedGammaTable', windowPtr, loadlut, loadOnNextFlip);
303
if gfxhwtype == 3 & IsWin %#ok<AND2>
315
if gfxhwtype == 3 && IsWin
304
316
% This is an experimental variant of the OS/X type 3 lut, but with 256
305
317
% slots. It is supposed for WindowsXP, assuming some NVidia GPU's,
306
318
% e.g., some QuadroFX 3700 GPU's have similar problems:
315
327
oldClut = Screen('LoadNormalizedGammaTable', windowPtr, loadlut, loadOnNextFlip);
318
if gfxhwtype == 3 & IsLinux %#ok<AND2>
330
if gfxhwtype == 3 && IsLinux
319
331
% NVidia QuadroFX cards with binary blob and lut's with more than
320
332
% 256 slots. Upload a standard linear lut with matching number of
added
removed
Psychtoolbox/PsychOneliners/LoadIdentityClut.m
