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//

//  OpenGLContext.Mac.mm

//

//  Created by Jakob Wilm on 18/03/13.

//  Copyright (c) 2013 Jakob Wilm. All rights reserved.

//

#include "OpenGLContext.h"

#include <Cocoa/Cocoa.h>

#include <OpenGL/OpenGL.h>

struct OpenGLContext::OpenGLContextInfo{

    NSOpenGLContext *context;

    OpenGLContextInfo() : context(NULL){}

};

std::vector<ScreenInfo> OpenGLContext::GetScreenInfo(){

    std::vector<ScreenInfo> ret;

        NSArray *screens = [NSScreen screens];

        for (unsigned int i=0; i<[screens count]; i++) {

            NSRect frame = [[screens objectAtIndex:i] frame];

            ScreenInfo screenInfo;

            screenInfo.resX = frame.size.width;

            screenInfo.resY = frame.size.height;

            ret.push_back(screenInfo);

        }

    return ret;

}

OpenGLContext::OpenGLContext(unsigned int _screenNum){

    // Set instance var

    screenNum = _screenNum;

    std::vector<ScreenInfo> screens = GetScreenInfo();

    if(screenNum > screens.size())

        throw "Could not create OpenGLContext. Screen not available!";

    contextInfo = new OpenGLContextInfo();

    // Create a fullscreen OpenGL OpenGLContext on the specified screen

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    // Instatiate NSApplication and connect to window server

    [NSApplication sharedApplication];

    // Chose application with dock icon (OS X Mavericks)

    [NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];

    NSRect displayRect = [[[NSScreen screens] objectAtIndex:screenNum] frame];

    screenResX = displayRect.size.width;

    screenResY = displayRect.size.height;

    NSRect viewRect = NSMakeRect(0.0, 0.0, displayRect.size.width, displayRect.size.height);

    NSOpenGLPixelFormatAttribute attrs[] = {NSOpenGLPFADoubleBuffer,0};

    NSOpenGLPixelFormat* pixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attrs];

    NSOpenGLView *openGLView = [[NSOpenGLView alloc] initWithFrame:viewRect pixelFormat:pixelFormat];

    NSDictionary *fullScreenOptions = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:FALSE], @"NSFullScreenModeAllScreens", nil];

    [openGLView enterFullScreenMode:[[NSScreen screens] objectAtIndex:screenNum] withOptions:fullScreenOptions];

    contextInfo->context = [openGLView openGLContext];

    [contextInfo->context makeCurrentContext];

    // Set the swap interval to match vsync

    const GLint swapInterval = 1;

    [contextInfo->context setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];

    // Adjust gamma to one

    NSNumber *screenNumber = [[[[NSScreen screens] objectAtIndex:screenNum] deviceDescription] objectForKey:@"NSScreenNumber"];

    CGSetDisplayTransferByFormula([screenNumber intValue], 0, 1, 1, 0, 1, 1, 0, 1, 1);

//  // Disable cursor

//  [openGLView addCursorRect:viewRect cursor:[NSCursor crosshairCursor]];

    [pool drain];

}

void OpenGLContext::setGamma(float gamma){

    // Adjust gamma

    NSNumber *screenNumber = [[[[NSScreen screens] objectAtIndex:screenNum] deviceDescription] objectForKey:@"NSScreenNumber"];

    CGSetDisplayTransferByFormula([screenNumber intValue], 0, 1, gamma, 0, 1, gamma, 0, 1, gamma);

}

OpenGLContext::~OpenGLContext(){

    [[contextInfo->context view] exitFullScreenModeWithOptions:Nil];

    //[[_openGLContext view] dealloc];

}

void OpenGLContext::flush(){

    // Flush OpenGL commands

    [contextInfo->context flushBuffer];

    //glSwapAPPLE();

    //glFinishRenderAPPLE();

}

void OpenGLContext::makeContextCurrent(){

    [contextInfo->context makeCurrentContext];

}