Category for Sparrow to fix stretching and center stage on auto rotation.

SPStage+AutoRotationFix.h

//
//  SPStage+AutoRotationFix.h
//  Barebone
//
//  Created by Shilo White on 7/2/14.
//
//

#import <Sparrow/Sparrow.h>

@interface SPStage (AutoRotationFix)

@end

SPStage+AutoRotationFix.m

//
//  SPStage+AutoRotationFix.m
//  Barebone
//
//  Created by Shilo White on 7/2/14.
//
//

#import "SPStage+AutoRotationFix.h"

@implementation SPStage (AutoRotationFix)

- (void)render:(SPRenderSupport *)support
{
    [SPRenderSupport clearWithColor:self.color alpha:1.0f];
    
    CALayer *glLayer = [Sparrow currentController].view.layer;
    if (glLayer.animationKeys)
    {
        CGSize glLayerSize = glLayer.bounds.size;
        CGSize presentationLayerSize = ((CALayer *)glLayer.presentationLayer).bounds.size;
        CGFloat widthRatio = presentationLayerSize.width/glLayerSize.width;
        CGFloat heightRatio = presentationLayerSize.height/glLayerSize.height;
        
        CGFloat offsetLeft = -(self.width/2)*(widthRatio-1);
        CGFloat offsetTop = -(self.height/2)*(heightRatio-1);
        
        [support setupOrthographicProjectionWithLeft:offsetLeft right:(self.width*widthRatio)+offsetLeft top:offsetTop bottom:(self.height*heightRatio)+offsetTop];
    }
    else
        [support setupOrthographicProjectionWithLeft:0 right:self.width top:0 bottom:self.height];
    
    [super render:support];
}

@end