/*

 File: EAGLView.m

 Abstract: The EAGLView class is a UIView subclass that renders OpenGL scene.

 If the current hardware supports OpenGL ES 2.0, it draws using OpenGL ES 2.0;

 otherwise it draws using OpenGL ES 1.1.

 Version: 1.0

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 Copyright (C) 2009 Apple Inc. All Rights Reserved.

*/

#import "EAGLView.h"

#import "ES1Renderer.h"

#import "ES2Renderer.h"

@implementation EAGLView

@synthesize animating;

@dynamic animationFrameInterval;

// You must implement this method

+ (Class) layerClass

{

    return [CAEAGLLayer class];

}

//The GL view is stored in the nib file. When it's unarchived it's sent -initWithCoder:

- (id) initWithCoder:(NSCoder*)coder

{    

    if ((self = [super initWithCoder:coder]))

    {

        // Get the layer

        CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;

        eaglLayer.opaque = TRUE;

        eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:

                                        [NSNumber numberWithBool:FALSE], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil];

        renderer = [[ES2Renderer alloc] init];

        if (!renderer)

        {

            renderer = [[ES1Renderer alloc] init];

            if (!renderer)

            {

                [self release];

                return nil;

            }

        }

        animating = FALSE;

        displayLinkSupported = FALSE;

        animationFrameInterval = 1;

        displayLink = nil;

        animationTimer = nil;

        // A system version of 3.1 or greater is required to use CADisplayLink. The NSTimer

        // class is used as fallback when it isn't available.

        NSString *reqSysVer = @"3.1";

        NSString *currSysVer = [[UIDevice currentDevice] systemVersion];

        if ([currSysVer compare:reqSysVer options:NSNumericSearch] != NSOrderedAscending)

            displayLinkSupported = TRUE;

    }

    return self;

}

- (void) drawView:(id)sender

{

    [renderer render];

}

- (void) layoutSubviews

{

    [renderer resizeFromLayer:(CAEAGLLayer*)self.layer];

    [self drawView:nil];

}

- (NSInteger) animationFrameInterval

{

    return animationFrameInterval;

}

- (void) setAnimationFrameInterval:(NSInteger)frameInterval

{

    // Frame interval defines how many display frames must pass between each time the

    // display link fires. The display link will only fire 30 times a second when the

    // frame internal is two on a display that refreshes 60 times a second. The default

    // frame interval setting of one will fire 60 times a second when the display refreshes

    // at 60 times a second. A frame interval setting of less than one results in undefined

    // behavior.

    if (frameInterval >= 1)

    {

        animationFrameInterval = frameInterval;

        if (animating)

        {

            [self stopAnimation];

            [self startAnimation];

        }

    }

}

- (void) startAnimation

{

    if (!animating)

    {

        if (displayLinkSupported)

        {

            // CADisplayLink is API new to iPhone SDK 3.1. Compiling against earlier versions will result in a warning, but can be dismissed

            // if the system version runtime check for CADisplayLink exists in -initWithCoder:. The runtime check ensures this code will

            // not be called in system versions earlier than 3.1.

            displayLink = [NSClassFromString(@"CADisplayLink") displayLinkWithTarget:self selector:@selector(drawView:)];

            [displayLink setFrameInterval:animationFrameInterval];

            [displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

        }

        else

            animationTimer = [NSTimer scheduledTimerWithTimeInterval:(NSTimeInterval)((1.0 / 60.0) * animationFrameInterval) target:self selector:@selector(drawView:) userInfo:nil repeats:TRUE];

        animating = TRUE;

    }

}

- (void)stopAnimation

{

    if (animating)

    {

        if (displayLinkSupported)

        {

            [displayLink invalidate];

            displayLink = nil;

        }

        else

        {

            [animationTimer invalidate];

            animationTimer = nil;

        }

        animating = FALSE;

    }

}

- (void) dealloc

{

    [renderer release];

    [super dealloc];

}

@end