/*

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                expressly stated in this notice, no other rights or licenses, express or implied,

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                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

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*/

class DirectDisplay

{

    CGDisplayCount num_displays;

    CGDirectDisplayID* display_ids;

    long get_value(CFDictionaryRef values, CFStringRef key)

    {

        CFNumberRef number_value = (CFNumberRef) CFDictionaryGetValue(values, key);

        if (!number_value)

            return -1;

        long int_value;

        if (!CFNumberGetValue(number_value, kCFNumberLongType, &int_value))

            return -1;

        return int_value;

    }

    void DumpDisplayModeValues(CFDictionaryRef values)

    {

        printf("   ----- Display Mode Info for %d -----\n", get_value(values, kCGDisplayMode));

        printf("   Bounds = %d x %d\n", get_value(values, kCGDisplayWidth), get_value(values, kCGDisplayHeight));

        printf("   bpp = %d, hz = %d\n", get_value(values, kCGDisplayBitsPerPixel), get_value(values,  kCGDisplayRefreshRate));

    }

public:

    DirectDisplay()

    {

        num_displays = 0;

        display_ids = 0;

    }

    int Init()

    {

         if (CGGetActiveDisplayList(0, NULL, &num_displays) != CGDisplayNoErr || num_displays == 0)

            return 0;

        display_ids = new CGDirectDisplayID[num_displays];

        if (CGGetActiveDisplayList(num_displays, display_ids, &num_displays) != CGDisplayNoErr)

            return false;

        return num_displays;

    }

    CGRect GetDisplayBounds(CGDisplayCount display_num)

    {

        if (display_num >= num_displays)

            return CGRectMake(0,0,0,0);

        return CGDisplayBounds(display_ids[display_num]);

    }

    u_int32_t GetOpenGLDisplayID(CGDisplayCount display_num)

    {

        if (display_num >= num_displays)

            return 0;

        return CGDisplayIDToOpenGLDisplayMask(display_ids[display_num]);

    }

    void DumpCurrentDisplayMode(CGDisplayCount display_num)

    {

        if (display_num >= num_displays)

            return;

        CFDictionaryRef display_mode_values = CGDisplayCurrentMode(display_ids[display_num]);

        DumpDisplayModeValues(display_mode_values);

    }

    void DumpDisplayModes(CGDisplayCount display_num)

    {

        if (display_num >= num_displays)

            return;

        CFArrayRef display_modes = CGDisplayAvailableModes(display_ids[display_num]);

        CFIndex num_modes = CFArrayGetCount(display_modes);

        printf("+ %d Display Modes for Display %d (OpenGL mask = %x)\n", num_modes, display_num, CGDisplayIDToOpenGLDisplayMask(display_ids[display_num]));

        for (int i = 0; i < num_modes; i++)

            DumpDisplayModeValues((CFDictionaryRef) CFArrayGetValueAtIndex(display_modes, i));

    }

    bool SetDisplayMode(CGDisplayCount display_num, const CGSize& size, size_t bpp, CGRefreshRate hz)

    {

        if (display_num >= num_displays)

            return false;

        CFDictionaryRef display_mode_values = CGDisplayBestModeForParametersAndRefreshRate(display_ids[display_num], bpp, (size_t) size.width, (size_t) size.height, hz, NULL);

        int display_hz = get_value(display_mode_values,  kCGDisplayRefreshRate);        

        printf("Setting Display Mode to %.0f x %.0f @%dhz\n", size.width, size.height, display_hz);

        CGDisplayErr err = CGDisplaySwitchToMode(display_ids[display_num], display_mode_values);

        return err == CGDisplayNoErr;

    }

    bool Capture(CGDisplayCount display_num)

    {

        if (display_num >= num_displays || CGDisplayIsCaptured(display_ids[display_num]))

            return false;

        return CGDisplayCapture(display_ids[display_num]) == CGDisplayNoErr;

    }

    bool Release(CGDisplayCount display_num = 0)

    {

        if (display_num >= num_displays || !CGDisplayIsCaptured(display_ids[display_num]))

            return false;

        return CGDisplayRelease(display_ids[display_num]) == CGDisplayNoErr;

    }

};