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+/*
+
+===== IMPORTANT =====
+
+This is sample code demonstrating API, technology or techniques in development.
+Although this sample code has been reviewed for technical accuracy, it is not
+final. Apple is supplying this information to help you plan for the adoption of
+the technologies and programming interfaces described herein. This information
+is subject to change, and software implemented based on this sample code should
+be tested with final operating system software and final documentation. Newer
+versions of this sample code may be provided with future seeds of the API or
+technology. For information about updates to this and other developer
+documentation, view the New & Updated sidebars in subsequent documentation
+seeds.
+
+=====================
+
+File: EAGLView.m
+Abstract: Convenience class that wraps the CAEAGLLayer from CoreAnimation into a
+UIView subclass.
+
+Version: 1.3
+
+Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Inc.
+("Apple") in consideration of your agreement to the following terms, and your
+use, installation, modification or redistribution of this Apple software
+constitutes acceptance of these terms.  If you do not agree with these terms,
+please do not use, install, modify or redistribute this Apple software.
+
+In consideration of your agreement to abide by the following terms, and subject
+to these terms, Apple grants you a personal, non-exclusive license, under
+Apple's copyrights in this original Apple software (the "Apple Software"), to
+use, reproduce, modify and redistribute the Apple Software, with or without
+modifications, in source and/or binary forms; provided that if you redistribute
+the Apple Software in its entirety and without modifications, you must retain
+this notice and the following text and disclaimers in all such redistributions
+of the Apple Software.
+Neither the name, trademarks, service marks or logos of Apple Inc. may be used
+to endorse or promote products derived from the Apple Software without specific
+prior written permission from Apple.  Except as expressly stated in this notice,
+no other rights or licenses, express or implied, are granted by Apple herein,
+including but not limited to any patent rights that may be infringed by your
+derivative works or by other works in which the Apple Software may be
+incorporated.
+
+The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO
+WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
+WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
+COMBINATION WITH YOUR PRODUCTS.
+
+IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR
+DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF
+CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF
+APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Copyright (C) 2008 Apple Inc. All Rights Reserved.
+
+*/
+
+// Only compile this code on iOS. These files should NOT be included on your Mac project.
+// But in case they are included, it won't be compiled.
+#import <Availability.h>
+#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
+
+#import <QuartzCore/QuartzCore.h>
+
+#import "EAGLView.h"
+#import "ES1Renderer.h"
+#import "../../CCDirector.h"
+#import "../../ccMacros.h"
+#import "../../CCConfiguration.h"
+#import "../../Support/OpenGL_Internal.h"
+
+
+//CLASS IMPLEMENTATIONS:
+
+@interface EAGLView (Private)
+- (BOOL) setupSurfaceWithSharegroup:(EAGLSharegroup*)sharegroup;
+- (unsigned int) convertPixelFormat:(NSString*) pixelFormat;
+@end
+
+@implementation EAGLView
+
+@synthesize surfaceSize=size_;
+@synthesize pixelFormat=pixelformat_, depthFormat=depthFormat_;
+@synthesize touchDelegate=touchDelegate_;
+@synthesize context=context_;
+@synthesize multiSampling=multiSampling_;
+
++ (Class) layerClass
+{
+        return [CAEAGLLayer class];
+}
+
++ (id) viewWithFrame:(CGRect)frame
+{
+        return [[[self alloc] initWithFrame:frame] autorelease];
+}
+
++ (id) viewWithFrame:(CGRect)frame pixelFormat:(NSString*)format
+{
+        return [[[self alloc] initWithFrame:frame pixelFormat:format] autorelease];
+}
+
++ (id) viewWithFrame:(CGRect)frame pixelFormat:(NSString*)format depthFormat:(GLuint)depth
+{
+        return [[[self alloc] initWithFrame:frame pixelFormat:format depthFormat:depth preserveBackbuffer:NO sharegroup:nil multiSampling:NO numberOfSamples:0] autorelease];
+}
+
++ (id) viewWithFrame:(CGRect)frame pixelFormat:(NSString*)format depthFormat:(GLuint)depth preserveBackbuffer:(BOOL)retained sharegroup:(EAGLSharegroup*)sharegroup multiSampling:(BOOL)multisampling numberOfSamples:(unsigned int)samples
+{
+        return [[[self alloc] initWithFrame:frame pixelFormat:format depthFormat:depth preserveBackbuffer:retained sharegroup:sharegroup multiSampling:multisampling numberOfSamples:samples] autorelease];
+}
+
+- (id) initWithFrame:(CGRect)frame
+{
+        return [self initWithFrame:frame pixelFormat:kEAGLColorFormatRGB565 depthFormat:0 preserveBackbuffer:NO sharegroup:nil multiSampling:NO numberOfSamples:0];
+}
+
+- (id) initWithFrame:(CGRect)frame pixelFormat:(NSString*)format 
+{
+        return [self initWithFrame:frame pixelFormat:format depthFormat:0 preserveBackbuffer:NO sharegroup:nil multiSampling:NO numberOfSamples:0];
+}
+
+- (id) initWithFrame:(CGRect)frame pixelFormat:(NSString*)format depthFormat:(GLuint)depth preserveBackbuffer:(BOOL)retained sharegroup:(EAGLSharegroup*)sharegroup multiSampling:(BOOL)sampling numberOfSamples:(unsigned int)nSamples
+{
+        if((self = [super initWithFrame:frame]))
+        {
+                pixelformat_ = format;
+                depthFormat_ = depth;
+                multiSampling_ = sampling;
+                requestedSamples_ = nSamples;
+                preserveBackbuffer_ = retained;
+                
+                if( ! [self setupSurfaceWithSharegroup:sharegroup] ) {
+                        [self release];
+                        return nil;
+                }
+        }
+
+        return self;
+}
+
+-(id) initWithCoder:(NSCoder *)aDecoder
+{
+        if( (self = [super initWithCoder:aDecoder]) ) {
+                
+                CAEAGLLayer*                    eaglLayer = (CAEAGLLayer*)[self layer];
+                
+                pixelformat_ = kEAGLColorFormatRGB565;
+                depthFormat_ = 0; // GL_DEPTH_COMPONENT24_OES;
+                multiSampling_= NO;
+                requestedSamples_ = 0;
+                size_ = [eaglLayer bounds].size;
+
+                if( ! [self setupSurfaceWithSharegroup:nil] ) {
+                        [self release];
+                        return nil;
+                }
+    }
+        
+    return self;
+}
+
+-(BOOL) setupSurfaceWithSharegroup:(EAGLSharegroup*)sharegroup
+{
+        CAEAGLLayer *eaglLayer = (CAEAGLLayer *)self.layer;
+        
+        eaglLayer.opaque = YES;
+        eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
+                                                                        [NSNumber numberWithBool:preserveBackbuffer_], kEAGLDrawablePropertyRetainedBacking,
+                                                                        pixelformat_, kEAGLDrawablePropertyColorFormat, nil];
+        
+        
+        renderer_ = [[ES1Renderer alloc] initWithDepthFormat:depthFormat_
+                                                                                 withPixelFormat:[self convertPixelFormat:pixelformat_]
+                                                                                  withSharegroup:sharegroup
+                                                                           withMultiSampling:multiSampling_
+                                                                         withNumberOfSamples:requestedSamples_];
+        if (!renderer_)
+                return NO;
+        
+        context_ = [renderer_ context];
+        [context_ renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:eaglLayer];
+
+        discardFramebufferSupported_ = [[CCConfiguration sharedConfiguration] supportsDiscardFramebuffer];
+        
+        return YES;
+}
+
+- (void) dealloc
+{
+        CCLOGINFO(@"cocos2d: deallocing %@", self);
+
+
+        [renderer_ release];
+        [super dealloc];
+}
+
+- (void) layoutSubviews
+{
+        size_ = [renderer_ backingSize];
+
+        [renderer_ resizeFromLayer:(CAEAGLLayer*)self.layer];
+
+        // Issue #914 #924
+        CCDirector *director = [CCDirector sharedDirector];
+        [director reshapeProjection:size_];
+        
+        // Avoid flicker. Issue #350
+        [director performSelectorOnMainThread:@selector(drawScene) withObject:nil waitUntilDone:YES];
+}       
+
+- (void) swapBuffers
+{
+        // IMPORTANT:
+        // - preconditions
+        //      -> context_ MUST be the OpenGL context
+        //      -> renderbuffer_ must be the the RENDER BUFFER
+
+#ifdef __IPHONE_4_0
+        
+        if (multiSampling_)
+        {
+                /* Resolve from msaaFramebuffer to resolveFramebuffer */
+                //glDisable(GL_SCISSOR_TEST);     
+                glBindFramebufferOES(GL_READ_FRAMEBUFFER_APPLE, [renderer_ msaaFrameBuffer]);
+                glBindFramebufferOES(GL_DRAW_FRAMEBUFFER_APPLE, [renderer_ defaultFrameBuffer]);
+                glResolveMultisampleFramebufferAPPLE();
+        }
+        
+        if( discardFramebufferSupported_)
+        {       
+                if (multiSampling_)
+                {
+                        if (depthFormat_)
+                        {
+                                GLenum attachments[] = {GL_COLOR_ATTACHMENT0_OES, GL_DEPTH_ATTACHMENT_OES};
+                                glDiscardFramebufferEXT(GL_READ_FRAMEBUFFER_APPLE, 2, attachments);
+                        }
+                        else
+                        {
+                                GLenum attachments[] = {GL_COLOR_ATTACHMENT0_OES};
+                                glDiscardFramebufferEXT(GL_READ_FRAMEBUFFER_APPLE, 1, attachments);
+                        }
+                        
+                        glBindRenderbufferOES(GL_RENDERBUFFER_OES, [renderer_ colorRenderBuffer]);
+        
+                }       
+                
+                // not MSAA
+                else if (depthFormat_ ) {
+                        GLenum attachments[] = { GL_DEPTH_ATTACHMENT_OES};
+                        glDiscardFramebufferEXT(GL_FRAMEBUFFER_OES, 1, attachments);
+                }
+        }
+        
+#endif // __IPHONE_4_0
+        
+        if(![context_ presentRenderbuffer:GL_RENDERBUFFER_OES])
+                CCLOG(@"cocos2d: Failed to swap renderbuffer in %s\n", __FUNCTION__);
+
+#if COCOS2D_DEBUG
+        CHECK_GL_ERROR();
+#endif
+        
+        // We can safely re-bind the framebuffer here, since this will be the
+        // 1st instruction of the new main loop
+        if( multiSampling_ )
+                glBindFramebufferOES(GL_FRAMEBUFFER_OES, [renderer_ msaaFrameBuffer]);
+}
+
+- (unsigned int) convertPixelFormat:(NSString*) pixelFormat
+{
+        // define the pixel format
+        GLenum pFormat;
+        
+        
+        if([pixelFormat isEqualToString:@"EAGLColorFormat565"]) 
+                pFormat = GL_RGB565_OES;
+        else 
+                pFormat = GL_RGBA8_OES;
+        
+        return pFormat;
+}
+
+#pragma mark EAGLView - Point conversion
+
+- (CGPoint) convertPointFromViewToSurface:(CGPoint)point
+{
+        CGRect bounds = [self bounds];
+        
+        return CGPointMake((point.x - bounds.origin.x) / bounds.size.width * size_.width, (point.y - bounds.origin.y) / bounds.size.height * size_.height);
+}
+
+- (CGRect) convertRectFromViewToSurface:(CGRect)rect
+{
+        CGRect bounds = [self bounds];
+        
+        return CGRectMake((rect.origin.x - bounds.origin.x) / bounds.size.width * size_.width, (rect.origin.y - bounds.origin.y) / bounds.size.height * size_.height, rect.size.width / bounds.size.width * size_.width, rect.size.height / bounds.size.height * size_.height);
+}
+
+// Pass the touches to the superview
+#pragma mark EAGLView - Touch Delegate
+
+- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
+{
+        if(touchDelegate_)
+        {
+                [touchDelegate_ touchesBegan:touches withEvent:event];
+        }
+}
+
+- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
+{
+        if(touchDelegate_)
+        {
+                [touchDelegate_ touchesMoved:touches withEvent:event];
+        }
+}
+
+- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
+{
+        if(touchDelegate_)
+        {
+                [touchDelegate_ touchesEnded:touches withEvent:event];
+        }
+}
+- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
+{
+        if(touchDelegate_)
+        {
+                [touchDelegate_ touchesCancelled:touches withEvent:event];
+        }
+}
+
+@end
+
+#endif // __IPHONE_OS_VERSION_MAX_ALLOWED
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