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/*
Psychtoolbox3/Source/Common/SCREENLoadNormalizedGammaTable.c
AUTHORS:
Allen.Ingling@nyu.edu awi
mario.kleiner@tuebingen.mpg.de mk
PLATFORMS:
All.
HISTORY:
1/27/03 awi Created.
1/30/06 mk Improved online help text.
DESCRIPTION:
Interface to the operating systems hardware gamma-table functions.
TO DO:
*/
#include "Screen.h"
// If you change useString then also change the corresponding synopsis string in ScreenSynopsis.c
static char useString[] = "Screen('LoadNormalizedGammaTable', windowPtrOrScreenNumber, table [, loadOnNextFlip] [, physicalDisplay]);";
static char synopsisString[] =
"Load the gamma table of the specified screen or window 'windowPtrOrScreenNumber'.\n"
"You need to pass the new hardware gamma table 'table' as a 'nrows' rows by 3 columns matrix. Each row corresponds to "
"a single color index value in the framebuffer and contains the Red- green- and blue values "
"to use for output. Column 1 is the red value, column 2 is the green value and column 3 is "
"the blue value. Values have to be in range between 0.0 (for dark pixel) and 1.0 (for maximum intensity). "
"Example: table(127,1)=0.67 would mean that the red color value 127 should be displayed with 67% of "
"the maximum red-gun intensity, table(32, 3)=0.11 means that blue color value 32 should be displayed "
"with 11% of the maximum blue-gun intensity. The range of values 0-1 gets mapped to the hardware with "
"the accuracy attainable by the hardwares DAC's, typically between 8 and 10 bits.\n"
"The required number of rows 'nrows' is typically 256 for consumer graphics cards.\n"
"On OS-X you can also pass 512, 1024, 2048, ..., 65535 rows instead of 256 rows, although this only "
"makes sense for a few selected applications, e.g., setup for the Bits++ box. On Linux with some "
"pro-graphics cards, e.g., some NVidia QuadroFX cards, you can pass more than 256 rows, similar to OS/X.\n"
"If you provide the index of an onscreen window as 'ScreenNumber' and you set the (optional) "
"flag 'loadOnNextFlip' to 1, then update of the gamma table will not happen immediately, but only at "
"execution of the Screen('Flip', windowPtrOrScreenNumber) command. This allows to synchronize change of "
"both the visual stimulus and change of the gamma table with each other and to the vertical retrace. If "
"the flag is set to its default value of zero then update of the gamma table will happen at the next "
"vertical retrace (or immediately if the graphics driver doesn't support sync to vertical retrace). "
"A 'loadOnNextFlip' flag of 2 will load the provided table not into the hardware tables of your graphics "
"card, but into the hardware tables of special display devices, like e.g., the Bits++ box. It can also "
"be used to load clut's for color lookup table animation. Read the section about 'EnableCLUTMapping' "
"in the 'help PsychImaging' for info on how to enable and use color lookup table animation.\n"
"On MacOS-X, the optional 'physicalDisplay' flag can be set to 1, zero is the default. In this case, "
"the 'windowPtrOrScreenNumber' argument (which then must be a real screen number, not a window index) "
"selects among physically present display devices, instead of logical devices. "
"This is important if you want to assign different gamma-tables to multiple displays in a 'clone' or "
"'mirror mode' configuration, as there is only one logical display, but multiple physical displays, mirroring "
"each other. Please note that screen numbering is different for physical vs. logical displays. For a list of "
"physical display indices, call Screen('Screens', 1);\n"
"On GNU/Linux, the optional 'physicalDisplay' parameter selects the video output to which the gamma "
"table should be applied in multi-display mode. On Linux a screen can output to multiple video displays, "
"therefore this parameter allows to setup individual gamma tables for each display. The default setting "
"is -1, which means to apply the (same) gamma table to all outputs of the given screen.\n"
"On MacOS-X and Linux, this function takes arbitrary gamma-tables which makes it suitable for CLUT animation, "
"although you should rather avoid CLUT animation, or use the PsychImaging(...'EnableCLUTMapping'...) method "
"instead. CLUT animation nowadays is almost always the wrong approach. If you really need it, the PsychImaging "
"based method provides cross-platform compatibility and reliable timing.\n"
"On Microsoft Windows, only tables with monotonically increasing values are considered valid. Other tables "
"get rejected by the operating system -- there's nothing we can do about this incredibly wise decision "
"of the Microsoft system designers :( , so this is not suitable for CLUT animation, but only for linearizing "
"or calibrating display devices. "
"The function returns the old gamma table as optional return argument. ";
static char seeAlsoString[] = "ReadNormalizedGammaTable";
PsychError SCREENLoadNormalizedGammaTable(void)
{
int i, screenNumber, numEntries, inM, inN, inP, loadOnNextFlip, physicalDisplay, outputId;
float *outRedTable, *outGreenTable, *outBlueTable, *inRedTable, *inGreenTable, *inBlueTable;
double *inTable, *outTable;
PsychWindowRecordType *windowRecord;
//all subfunctions should have these two lines
PsychPushHelp(useString, synopsisString, seeAlsoString);
if(PsychIsGiveHelp()){PsychGiveHelp();return(PsychError_none);};
PsychErrorExit(PsychCapNumOutputArgs(1));
PsychErrorExit(PsychCapNumInputArgs(4));
// Get optional physicalDisplay argument - It defaults to zero on OS/X, -1 on Linux:
physicalDisplay = -1;
PsychCopyInIntegerArg(4, FALSE, &physicalDisplay);
// Read in the screen number:
// On OS/X we also accept screen indices for physical displays (as opposed to active dispays).
// This only makes a difference in mirror-mode, where there is only 1 active display, but that
// corresponds to two physical displays which can have different gamma setting requirements:
if ((PSYCH_SYSTEM == PSYCH_OSX) && (physicalDisplay > 0)) {
PsychCopyInIntegerArg(1, TRUE, &screenNumber);
if (screenNumber < 1) PsychErrorExitMsg(PsychError_user, "A 'screenNumber' that is smaller than one provided, although 'physicalDisplay' flag set. This is not allowed!");
// Invert screenNumber as a sign its a physical display, not an active display:
screenNumber = -1 * screenNumber;
}
else {
PsychCopyInScreenNumberArg(1, TRUE, &screenNumber);
}
if ((PSYCH_SYSTEM == PSYCH_LINUX) && (physicalDisplay > -1)) {
// Affect one specific display output for given screen:
outputId = physicalDisplay;
}
else {
// Other OS'es, and Linux with default setting: Affect all outputs
// for a screen.
outputId = -1;
}
// Load and sanity check the input matrix:
inM = -1; inN = -1; inP = -1;
if (!PsychAllocInDoubleMatArg(2, FALSE, &inM, &inN, &inP, &inTable)) {
// Special case: Allow passing in an empty gamma table argument. This
// triggers auto-load of identity LUT and setup of GPU for identity passthrough:
inM = 0; inN = 3; inP = 1;
}
// Sanity check dimensions:
if((inN != 3) || (inP != 1)) PsychErrorExitMsg(PsychError_user, "The gamma table must have 3 columns (Red, Green, Blue).");
// Identity passthrouh setup requested?
if (inM == 0) {
// Yes. Try to enable it, return its status code:
PsychAllocInWindowRecordArg(1, TRUE, &windowRecord);
i = PsychSetGPUIdentityPassthrough(windowRecord, screenNumber, TRUE);
PsychCopyOutDoubleArg(1, FALSE, (double) i);
// Done.
return(PsychError_none);
}
#if PSYCH_SYSTEM != PSYCH_WINDOWS
// OS-X and Linux allow tables with other than 256 slots:
// OS/X either passes them to hw if in native size, or performs
// software interpolation to convert it into native size. We allow any table size with 1 - x slots.
// A table size of 1 row will have a special meaning. It interprets the 1 row of the table as gamma formula
// min, max, gamma and lets the OS compute a corresponding gamma correction table.
// A table size of zero rows will trigger an internal upload of an identity table via byte transfer.
// On Linux we need to interpolate ourselves on non-matching table sizes.
#else
// Windows requires 256 slots:
if((inM != 256) && (inM != 0)) {
PsychErrorExitMsg(PsychError_user, "The gamma table must have 256 rows.");
}
#endif
// Copy in optional loadOnNextFlip - flag. It defaults to zero. If provided
// with a non-zero value, we will defer actual update of the gamma table to
// the next bufferswap as initiated via Screen('Flip').
loadOnNextFlip = 0;
PsychCopyInIntegerArg(3, FALSE, &loadOnNextFlip);
if (loadOnNextFlip>0) {
if ((PSYCH_SYSTEM == PSYCH_OSX) && (physicalDisplay > 0)) PsychErrorExitMsg(PsychError_user, "Non-zero 'loadOnNextFlip' flag not allowed if 'physicalDisplays' flag is non-zero!");
if ((PSYCH_SYSTEM == PSYCH_LINUX) && (physicalDisplay > -1)) PsychErrorExitMsg(PsychError_user, "Non-zero 'loadOnNextFlip' flag not allowed if 'physicalDisplays' setting is positive!");
// Allocate tables in associated windowRecord: We will update during next
// Flip operation for specified windowRecord.
PsychAllocInWindowRecordArg(1, TRUE, &windowRecord);
// Sanity checks:
if (!PsychIsOnscreenWindow(windowRecord)) PsychErrorExitMsg(PsychError_user, "Target window for gamma table upload is not an onscreen window!");
if (windowRecord->inRedTable && loadOnNextFlip!=2) PsychErrorExitMsg(PsychError_user, "This window has already a new gamma table assigned for upload on next Flip!");
if (windowRecord->inRedTable && windowRecord->inTableSize != inM) {
free(windowRecord->inRedTable); windowRecord->inRedTable = NULL;
free(windowRecord->inGreenTable); windowRecord->inGreenTable = NULL;
free(windowRecord->inBlueTable); windowRecord->inBlueTable = NULL;
}
if (windowRecord->inRedTable == NULL) {
// Allocate persistent memory:
inRedTable=malloc(sizeof(float) * inM);
inGreenTable=malloc(sizeof(float) * inM);
inBlueTable=malloc(sizeof(float) * inM);
// Assign the pointers to the windowRecord:
windowRecord->inRedTable = inRedTable;
windowRecord->inGreenTable = inGreenTable;
windowRecord->inBlueTable = inBlueTable;
windowRecord->inTableSize = inM;
}
else {
inRedTable = windowRecord->inRedTable;
inGreenTable = windowRecord->inGreenTable;
inBlueTable = windowRecord->inBlueTable;
}
windowRecord->loadGammaTableOnNextFlip = (loadOnNextFlip == 1) ? 1 : 0;
}
else {
// Allocate temporary tables: We will update immediately.
inRedTable=PsychMallocTemp(sizeof(float) * inM);
inGreenTable=PsychMallocTemp(sizeof(float) * inM);
inBlueTable=PsychMallocTemp(sizeof(float) * inM);
}
for(i=0;i<inM;i++){
inRedTable[i]=(float)inTable[PsychIndexElementFrom3DArray(inM, 3, 0, i, 0, 0)];
inGreenTable[i]=(float)inTable[PsychIndexElementFrom3DArray(inM, 3, 0, i, 1, 0)];
inBlueTable[i]=(float)inTable[PsychIndexElementFrom3DArray(inM, 3, 0, i, 2, 0)];
if(inRedTable[i]>1 || inRedTable[i]< 0 || inGreenTable[i] > 1 || inGreenTable[i] < 0 || inBlueTable[i] >1 || inBlueTable[i] < 0)
PsychErrorExitMsg(PsychError_user, "Gamma Table Values must be in interval 0 =< x =< 1");
}
if (loadOnNextFlip < 2) {
//first read the existing gamma table so we can return it.
PsychReadNormalizedGammaTable(screenNumber, outputId, &numEntries, &outRedTable, &outGreenTable, &outBlueTable);
PsychAllocOutDoubleMatArg(1, FALSE, numEntries, 3, 0, &outTable);
for(i=0;i<numEntries;i++){
outTable[PsychIndexElementFrom3DArray(numEntries, 3, 0, i, 0, 0)]=(double)outRedTable[i];
outTable[PsychIndexElementFrom3DArray(numEntries, 3, 0, i, 1, 0)]=(double)outGreenTable[i];
outTable[PsychIndexElementFrom3DArray(numEntries, 3, 0, i, 2, 0)]=(double)outBlueTable[i];
}
}
//Now set the new gamma table
if (loadOnNextFlip == 0) PsychLoadNormalizedGammaTable(screenNumber, outputId, inM, inRedTable, inGreenTable, inBlueTable);
return(PsychError_none);
}
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