/*

     File: GLView.mm

 Abstract: The OpenGL view. It delegates to the renderer class for drawing.

  Version: 1.1

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 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

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 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 */

#import "GLView.h"

#define kSpacebarKeyCode 49

static CVReturn Heartbeat (     CVDisplayLinkRef displayLink,

                           const CVTimeStamp *inNow,

                           const CVTimeStamp *inOutputTime,

                           CVOptionFlags flagsIn,

                           CVOptionFlags *flagsOut,

                           void *displayLinkContext)

{

    CallbackContext* ctx = (CallbackContext*) displayLinkContext;

    // this method is called on a background thread via the display link

    // make sure we have the right context

    CGLSetCurrentContext((CGLContextObj) [ctx->ctx CGLContextObj]);

    // and lock it to avoid thread conflicts

    CGLLockContext((CGLContextObj) [ctx->ctx CGLContextObj]);

    [ctx->renderer draw];

    CGLFlushDrawable((CGLContextObj) [ctx->ctx CGLContextObj]);

    CGLUnlockContext((CGLContextObj) [ctx->ctx CGLContextObj]);

    return kCVReturnSuccess;

}

@implementation GLView

- (id)initWithFrame:(NSRect)frame {

    NSOpenGLPixelFormatAttribute attrs[] = {

        NSOpenGLPFADoubleBuffer,

        NSOpenGLPFADepthSize, 24,

        NSOpenGLPFAStencilSize, 8,

        NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core, //Core Profile

        0

    };

    cbCtx = (CallbackContext*) malloc(sizeof(CallbackContext));

    NSOpenGLPixelFormat *format = [[[NSOpenGLPixelFormat alloc] initWithAttributes:attrs] autorelease];

    self = [super initWithFrame:frame pixelFormat: format];

    if (self)

    {

        pf = format;

        cbCtx->ctx = [self openGLContext];

        [cbCtx->ctx makeCurrentContext];

        // create the renderer object

        cbCtx->renderer = [[OpenGLRenderer alloc] init];

        NSRect bounds = [self bounds];

        NSRect pixels = [self convertRectToBacking:bounds];

        [cbCtx->renderer reshapeToWidth:pixels.size.width height:pixels.size.height];

    }

    return self;

}

- (void)prepareOpenGL

{

    [super prepareOpenGL];

    if(![cbCtx->renderer setupGL])

    {

        NSLog(@"Could not set up GL context");

        assert(0);

    }

    CVDisplayLinkCreateWithActiveCGDisplays(&displayLink);

    CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(displayLink, (CGLContextObj) [cbCtx->ctx CGLContextObj], (CGLPixelFormatObj) [pf CGLPixelFormatObj]);

    CVDisplayLinkSetOutputCallback(displayLink, &Heartbeat, cbCtx);

    CVDisplayLinkStart(displayLink);

    [[self window] setAcceptsMouseMovedEvents:YES];

}

- (BOOL)acceptsFirstResponder

{

    return YES;

}

- (BOOL)becomeFirstResponder

{

    return YES;

}

- (void)dealloc

{

    CVDisplayLinkStop(displayLink);

    CVDisplayLinkRelease(displayLink);

    [pf release];

    [cbCtx->ctx release];

    [cbCtx->renderer release];

    free(cbCtx);

    [super dealloc];

}

- (void)keyDown:(NSEvent *)theEvent

{

    switch ([theEvent keyCode]) {

        case kSpacebarKeyCode:

            [cbCtx->renderer toggleAnimation];

            break;

        default:

            break;

    }

}

- (void)mouseMoved:(NSEvent *)theEvent

{

    NSPoint p = [self convertPoint:[theEvent locationInWindow] fromView:nil];

    // eat the first event so the mouse doesn't go crazy

    if(lastPoint.x + lastPoint.y <= 0.01)

    {

        lastPoint = p;

    }

    // if lastPoint is inside the view

    if ((lastPoint.x >= 0 && lastPoint.x < self.bounds.size.width) && (lastPoint.y >= 0 & lastPoint.y < self.bounds.size.height)) {

        float dx = lastPoint.x - p.x;

        float dy = lastPoint.y - p.y;

        [cbCtx->renderer applyCameraMovementWdx:dx dy:dy];

    }

    lastPoint = p;

}

@end