//========================================================================
// GLFW - An OpenGL library
// Platform:    Cocoa/NSOpenGL
// API Version: 3.0
// WWW:         http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2009-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would
//    be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
//    be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
//    distribution.
//
//========================================================================

#include "internal.h"


//========================================================================
// Check whether the display mode should be included in enumeration
//========================================================================

static BOOL modeIsGood(NSDictionary* mode)
{
    // This is a bit controversial, if you've got something other than an
    // LCD computer monitor as an output device you might not want these
    // checks.  You might also want to reject modes which are interlaced,
    // or TV out.  There is no one-size-fits-all policy that can work here.
    // This seems like a decent compromise, but certain applications may
    // wish to patch this...
    return [[mode objectForKey:(id)kCGDisplayBitsPerPixel] intValue] >= 15 &&
            [mode objectForKey:(id)kCGDisplayModeIsSafeForHardware] != nil &&
            [mode objectForKey:(id)kCGDisplayModeIsStretched] == nil;
}

//========================================================================
// Convert Core Graphics display mode to GLFW video mode
//========================================================================

static GLFWvidmode vidmodeFromCGDisplayMode(NSDictionary* mode)
{
    unsigned int width =
        [[mode objectForKey:(id)kCGDisplayWidth] unsignedIntValue];
    unsigned int height =
        [[mode objectForKey:(id)kCGDisplayHeight] unsignedIntValue];
    unsigned int bps =
        [[mode objectForKey:(id)kCGDisplayBitsPerSample] unsignedIntValue];

    GLFWvidmode result;
    result.width = width;
    result.height = height;
    result.redBits = bps;
    result.greenBits = bps;
    result.blueBits = bps;
    return result;
}


//////////////////////////////////////////////////////////////////////////
//////                       GLFW platform API                      //////
//////////////////////////////////////////////////////////////////////////

//========================================================================
// Get a list of available video modes
//========================================================================

int _glfwPlatformGetVideoModes(GLFWvidmode* list, int maxcount)
{
    NSArray* modes = (NSArray*) CGDisplayAvailableModes(CGMainDisplayID());
    unsigned int i, j = 0, n = [modes count];

    for (i = 0;  i < n && j < (unsigned)maxcount;  i++)
    {
        NSDictionary *mode = [modes objectAtIndex:i];
        if (modeIsGood(mode))
            list[j++] = vidmodeFromCGDisplayMode(mode);
    }

    return j;
}

//========================================================================
// Get the desktop video mode
//========================================================================

void _glfwPlatformGetDesktopMode(GLFWvidmode *mode)
{
    *mode = vidmodeFromCGDisplayMode(_glfwLibrary.NS.desktopMode);
}