static void setup_screen(void) { CGDirectDisplayID targetDisplay = kCGDirectMainDisplay; CGDisplayCapture(targetDisplay); /* crucial for being permitted to write on it */ screen.base = (uint32_t *) CGDisplayBaseAddress(targetDisplay); screen.stride = CGDisplayBytesPerRow(targetDisplay) / sizeof(uint32_t); screen.width = CGDisplayPixelsWide(targetDisplay); screen.height = CGDisplayPixelsHigh(targetDisplay); }
PsychError SCREENReadNormalizedGammaTable(void) { int i, screenNumber, numEntries, reallutsize, physicalDisplay, outputId; float *redTable, *greenTable, *blueTable; double *gammaTable; //all subfunctions should have these two lines PsychPushHelp(useString, synopsisString, seeAlsoString); if(PsychIsGiveHelp()){PsychGiveHelp();return(PsychError_none);}; PsychErrorExit(PsychCapNumOutputArgs(3)); PsychErrorExit(PsychCapNumInputArgs(2)); // Get optional physicalDisplay argument - It defaults to zero: physicalDisplay = -1; PsychCopyInIntegerArg(2, 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; } // Retrieve gamma table: PsychReadNormalizedGammaTable(screenNumber, outputId, &numEntries, &redTable, &greenTable, &blueTable); // Copy it out to runtime: PsychAllocOutDoubleMatArg(1, FALSE, numEntries, 3, 0, &gammaTable); for(i=0;i<numEntries;i++){ gammaTable[PsychIndexElementFrom3DArray(numEntries, 3, 0, i, 0, 0)]=(double)redTable[i]; gammaTable[PsychIndexElementFrom3DArray(numEntries, 3, 0, i, 1, 0)]=(double)greenTable[i]; gammaTable[PsychIndexElementFrom3DArray(numEntries, 3, 0, i, 2, 0)]=(double)blueTable[i]; } // Copy out optional DAC resolution value: PsychCopyOutDoubleArg(2, FALSE, (double) PsychGetDacBitsFromDisplay(screenNumber)); // We default to the assumption that the real size of the hardware LUT is identical to // the size of the returned LUT: reallutsize = numEntries; #if PSYCH_SYSTEM == PSYCH_OSX // On OS-X we query the real LUT size from the OS and return that value: CGDirectDisplayID displayID; CFMutableDictionaryRef properties; CFNumberRef cfGammaLength; SInt32 lutslotcount; io_service_t displayService; kern_return_t kr; CFMutableArrayRef framebufferTimings0 = 0; CFDataRef framebufferTimings1 = 0; IODetailedTimingInformationV2 *framebufferTiming = NULL; // Retrieve display handle for screen: PsychGetCGDisplayIDFromScreenNumber(&displayID, screenNumber); if (PsychPrefStateGet_Verbosity()>5) printf("PTB-DEBUG: Screen %i has framebuffer address %p.\n", screenNumber, CGDisplayBaseAddress(displayID)); // Retrieve low-level IOKit service port for this display: displayService = CGDisplayIOServicePort(displayID); // Obtain the properties from that service kr = IORegistryEntryCreateCFProperties(displayService, &properties, NULL, 0); if((kr == kIOReturnSuccess) && ((cfGammaLength = (CFNumberRef) CFDictionaryGetValue(properties, CFSTR(kIOFBGammaCountKey)))!=NULL)) { CFNumberGetValue(cfGammaLength, kCFNumberSInt32Type, &lutslotcount); CFRelease(properties); reallutsize = (int) lutslotcount; } else { // Failed! if (PsychPrefStateGet_Verbosity()>1) printf("PTB-WARNING: Failed to query real size of video LUT for screen %i! Will return safe default of %i slots.\n", screenNumber, reallutsize); } if (PsychPrefStateGet_Verbosity()>9) { CFDictionaryRef currentMode; CFNumberRef n; int modeId; currentMode = CGDisplayCurrentMode(displayID); n=CFDictionaryGetValue(currentMode, kCGDisplayMode); CFNumberGetValue(n, kCFNumberIntType, &modeId); printf("Current mode has id %i\n\n", modeId); kr = IORegistryEntryCreateCFProperties(displayService, &properties, NULL, 0); if((kr == kIOReturnSuccess) && ((framebufferTimings0 = (CFMutableArrayRef) CFDictionaryGetValue(properties, CFSTR(kIOFBDetailedTimingsKey) ) )!=NULL)) { for (i=0; i<CFArrayGetCount(framebufferTimings0); i++) { if ((framebufferTimings1 = CFArrayGetValueAtIndex(framebufferTimings0, i)) != NULL) { if ((framebufferTiming = (IODetailedTimingInformationV2*) CFDataGetBytePtr(framebufferTimings1)) != NULL) { printf("[%i] : VActive = %li, VBL = %li, VSYNC = %li, VSYNCWIDTH = %li , VBORDERBOT = %li, VTOTAL = %li \n", i, framebufferTiming->verticalActive, framebufferTiming->verticalBlanking, framebufferTiming->verticalSyncOffset, framebufferTiming->verticalSyncPulseWidth, framebufferTiming->verticalBorderBottom, framebufferTiming->verticalActive + framebufferTiming->verticalBlanking); } } } CFRelease(properties); } else { // Failed! if (PsychPrefStateGet_Verbosity()>1) printf("PTB-WARNING: Failed to query STUFF for screen %i --> %p!\n", screenNumber, properties); } } #endif // Copy out optional real LUT size (number of slots): PsychCopyOutDoubleArg(3, FALSE, (double) reallutsize); return(PsychError_none); }