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+/*
+ * cocos2d for iPhone: http://www.cocos2d-iphone.org
+ *
+ * Copyright (c) 2008-2010 Ricardo Quesada
+ * Copyright (c) 2011 Zynga Inc.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+
+#import <stdarg.h>
+
+#import "Platforms/CCGL.h"
+
+#import "CCLayer.h"
+#import "CCDirector.h"
+#import "ccMacros.h"
+#import "Support/CGPointExtension.h"
+
+#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
+#import "Platforms/iOS/CCTouchDispatcher.h"
+#import "Platforms/iOS/CCDirectorIOS.h"
+#elif defined(__MAC_OS_X_VERSION_MAX_ALLOWED)
+#import "Platforms/Mac/CCEventDispatcher.h"
+#endif
+
+#pragma mark -
+#pragma mark Layer
+
+@implementation CCLayer
+
+#pragma mark Layer - Init
+-(id) init
+{
+        if( (self=[super init]) ) {
+        
+                CGSize s = [[CCDirector sharedDirector] winSize];
+                anchorPoint_ = ccp(0.5f, 0.5f);
+                [self setContentSize:s];
+                self.isRelativeAnchorPoint = NO;
+
+                isTouchEnabled_ = NO;
+
+#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
+                isAccelerometerEnabled_ = NO;
+#elif defined(__MAC_OS_X_VERSION_MAX_ALLOWED)
+                isMouseEnabled_ = NO;
+                isKeyboardEnabled_ = NO;
+#endif
+        }
+        
+        return self;
+}
+
+#pragma mark Layer - Touch and Accelerometer related
+
+#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
+-(void) registerWithTouchDispatcher
+{
+        [[CCTouchDispatcher sharedDispatcher] addStandardDelegate:self priority:0];
+}
+
+-(BOOL) isAccelerometerEnabled
+{
+        return isAccelerometerEnabled_;
+}
+
+-(void) setIsAccelerometerEnabled:(BOOL)enabled
+{
+        if( enabled != isAccelerometerEnabled_ ) {
+                isAccelerometerEnabled_ = enabled;
+                if( isRunning_ ) {
+                        if( enabled )
+                                [[UIAccelerometer sharedAccelerometer] setDelegate:self];
+                        else
+                                [[UIAccelerometer sharedAccelerometer] setDelegate:nil];
+                }
+        }
+}
+
+-(BOOL) isTouchEnabled
+{
+        return isTouchEnabled_;
+}
+
+-(void) setIsTouchEnabled:(BOOL)enabled
+{
+        if( isTouchEnabled_ != enabled ) {
+                isTouchEnabled_ = enabled;
+                if( isRunning_ ) {
+                        if( enabled )
+                                [self registerWithTouchDispatcher];
+                        else
+                                [[CCTouchDispatcher sharedDispatcher] removeDelegate:self];
+                }
+        }
+}
+
+#elif defined(__MAC_OS_X_VERSION_MAX_ALLOWED)
+
+#pragma mark CCLayer - Mouse, Keyboard & Touch events
+
+-(NSInteger) mouseDelegatePriority
+{
+        return 0;
+}
+
+-(BOOL) isMouseEnabled
+{
+        return isMouseEnabled_;
+}
+
+-(void) setIsMouseEnabled:(BOOL)enabled
+{
+        if( isMouseEnabled_ != enabled ) {
+                isMouseEnabled_ = enabled;
+                
+                if( isRunning_ ) {
+                        if( enabled )
+                                [[CCEventDispatcher sharedDispatcher] addMouseDelegate:self priority:[self mouseDelegatePriority]];
+                        else
+                                [[CCEventDispatcher sharedDispatcher] removeMouseDelegate:self];
+                }
+        }
+}
+
+-(NSInteger) keyboardDelegatePriority
+{
+        return 0;
+}
+
+-(BOOL) isKeyboardEnabled
+{
+        return isKeyboardEnabled_;
+}
+
+-(void) setIsKeyboardEnabled:(BOOL)enabled
+{
+        if( isKeyboardEnabled_ != enabled ) {
+                isKeyboardEnabled_ = enabled;
+                
+                if( isRunning_ ) {
+                        if( enabled )
+                                [[CCEventDispatcher sharedDispatcher] addKeyboardDelegate:self priority:[self keyboardDelegatePriority] ];
+                        else
+                                [[CCEventDispatcher sharedDispatcher] removeKeyboardDelegate:self];
+                }
+        }
+}
+
+-(NSInteger) touchDelegatePriority
+{
+        return 0;
+}
+
+-(BOOL) isTouchEnabled
+{
+        return isTouchEnabled_;
+}
+
+-(void) setIsTouchEnabled:(BOOL)enabled
+{
+        if( isTouchEnabled_ != enabled ) {
+                isTouchEnabled_ = enabled;
+                if( isRunning_ ) {
+                        if( enabled )
+                                [[CCEventDispatcher sharedDispatcher] addTouchDelegate:self priority:[self touchDelegatePriority]];
+                        else
+                                [[CCEventDispatcher sharedDispatcher] removeTouchDelegate:self];
+                }
+        }
+}
+
+
+#endif // Mac
+
+
+#pragma mark Layer - Callbacks
+-(void) onEnter
+{
+#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
+        // register 'parent' nodes first
+        // since events are propagated in reverse order
+        if (isTouchEnabled_)
+                [self registerWithTouchDispatcher];
+
+#elif defined(__MAC_OS_X_VERSION_MAX_ALLOWED)
+        if( isMouseEnabled_ )
+                [[CCEventDispatcher sharedDispatcher] addMouseDelegate:self priority:[self mouseDelegatePriority]];
+        
+        if( isKeyboardEnabled_)
+                [[CCEventDispatcher sharedDispatcher] addKeyboardDelegate:self priority:[self keyboardDelegatePriority]];
+
+        if( isTouchEnabled_)
+                [[CCEventDispatcher sharedDispatcher] addTouchDelegate:self priority:[self touchDelegatePriority]];
+
+#endif
+        
+        // then iterate over all the children
+        [super onEnter];
+}
+
+// issue #624.
+// Can't register mouse, touches here because of #issue #1018, and #1021
+-(void) onEnterTransitionDidFinish
+{
+#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
+        if( isAccelerometerEnabled_ )
+                [[UIAccelerometer sharedAccelerometer] setDelegate:self];
+#endif
+        
+        [super onEnterTransitionDidFinish];
+}
+
+
+-(void) onExit
+{
+#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
+        if( isTouchEnabled_ )
+                [[CCTouchDispatcher sharedDispatcher] removeDelegate:self];
+        
+        if( isAccelerometerEnabled_ )
+                [[UIAccelerometer sharedAccelerometer] setDelegate:nil];
+
+#elif defined(__MAC_OS_X_VERSION_MAX_ALLOWED)
+        if( isMouseEnabled_ )
+                [[CCEventDispatcher sharedDispatcher] removeMouseDelegate:self];
+        
+        if( isKeyboardEnabled_ )
+                [[CCEventDispatcher sharedDispatcher] removeKeyboardDelegate:self];
+
+        if( isTouchEnabled_ )
+                [[CCEventDispatcher sharedDispatcher] removeTouchDelegate:self];
+
+#endif
+        
+        [super onExit];
+}
+
+#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
+-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event
+{
+        NSAssert(NO, @"Layer#ccTouchBegan override me");
+        return YES;
+}
+#endif
+@end
+
+#pragma mark -
+#pragma mark LayerColor
+
+@interface CCLayerColor (Private)
+-(void) updateColor;
+@end
+
+@implementation CCLayerColor
+
+// Opacity and RGB color protocol
+@synthesize opacity = opacity_, color = color_;
+@synthesize blendFunc = blendFunc_;
+
+
++ (id) layerWithColor:(ccColor4B)color width:(GLfloat)w  height:(GLfloat) h
+{
+        return [[[self alloc] initWithColor:color width:w height:h] autorelease];
+}
+
++ (id) layerWithColor:(ccColor4B)color
+{
+        return [[(CCLayerColor*)[self alloc] initWithColor:color] autorelease];
+}
+
+- (id) initWithColor:(ccColor4B)color width:(GLfloat)w  height:(GLfloat) h
+{
+        if( (self=[super init]) ) {
+                
+                // default blend function
+                blendFunc_ = (ccBlendFunc) { CC_BLEND_SRC, CC_BLEND_DST };
+
+                color_.r = color.r;
+                color_.g = color.g;
+                color_.b = color.b;
+                opacity_ = color.a;
+                
+                for (NSUInteger i = 0; i<sizeof(squareVertices_) / sizeof( squareVertices_[0]); i++ ) {
+                        squareVertices_[i].x = 0.0f;
+                        squareVertices_[i].y = 0.0f;
+                }
+                                
+                [self updateColor];
+                [self setContentSize:CGSizeMake(w, h) ];
+        }
+        return self;
+}
+
+- (id) initWithColor:(ccColor4B)color
+{
+        CGSize s = [[CCDirector sharedDirector] winSize];
+        return [self initWithColor:color width:s.width height:s.height];
+}
+
+// override contentSize
+-(void) setContentSize: (CGSize) size
+{
+        squareVertices_[1].x = size.width * CC_CONTENT_SCALE_FACTOR();
+        squareVertices_[2].y = size.height * CC_CONTENT_SCALE_FACTOR();
+        squareVertices_[3].x = size.width * CC_CONTENT_SCALE_FACTOR();
+        squareVertices_[3].y = size.height * CC_CONTENT_SCALE_FACTOR();
+        
+        [super setContentSize:size];
+}
+
+- (void) changeWidth: (GLfloat) w height:(GLfloat) h
+{
+        [self setContentSize:CGSizeMake(w, h)];
+}
+
+-(void) changeWidth: (GLfloat) w
+{
+        [self setContentSize:CGSizeMake(w, contentSize_.height)];
+}
+
+-(void) changeHeight: (GLfloat) h
+{
+        [self setContentSize:CGSizeMake(contentSize_.width, h)];
+}
+
+- (void) updateColor
+{
+        for( NSUInteger i = 0; i < 4; i++ )
+        {
+                squareColors_[i].r = color_.r;
+                squareColors_[i].g = color_.g;
+                squareColors_[i].b = color_.b;
+                squareColors_[i].a = opacity_;
+        }
+}
+
+- (void)draw
+{               
+        [super draw];
+
+        // Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
+        // Needed states: GL_VERTEX_ARRAY, GL_COLOR_ARRAY
+        // Unneeded states: GL_TEXTURE_2D, GL_TEXTURE_COORD_ARRAY
+        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+        glDisable(GL_TEXTURE_2D);
+
+        glVertexPointer(2, GL_FLOAT, 0, squareVertices_);
+        glColorPointer(4, GL_UNSIGNED_BYTE, 0, squareColors_);
+        
+        
+        BOOL newBlend = blendFunc_.src != CC_BLEND_SRC || blendFunc_.dst != CC_BLEND_DST;
+        if( newBlend )
+                glBlendFunc( blendFunc_.src, blendFunc_.dst );
+        
+        else if( opacity_ != 255 ) {
+                newBlend = YES;
+                glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+        }
+        
+        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+        
+        if( newBlend )
+                glBlendFunc(CC_BLEND_SRC, CC_BLEND_DST);
+        
+        // restore default GL state
+        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+        glEnable(GL_TEXTURE_2D);
+}
+
+#pragma mark Protocols
+// Color Protocol
+
+-(void) setColor:(ccColor3B)color
+{
+        color_ = color;
+        [self updateColor];
+}
+
+-(void) setOpacity: (GLubyte) o
+{
+        opacity_ = o;
+        [self updateColor];
+}
+@end
+
+// XXX Deprecated
+@implementation CCColorLayer
+@end
+
+
+#pragma mark -
+#pragma mark LayerGradient
+
+@implementation CCLayerGradient
+
+@synthesize startOpacity = startOpacity_;
+@synthesize endColor = endColor_, endOpacity = endOpacity_;
+@synthesize vector = vector_;
+
++ (id) layerWithColor: (ccColor4B) start fadingTo: (ccColor4B) end
+{
+    return [[[self alloc] initWithColor:start fadingTo:end] autorelease];
+}
+
++ (id) layerWithColor: (ccColor4B) start fadingTo: (ccColor4B) end alongVector: (CGPoint) v
+{
+    return [[[self alloc] initWithColor:start fadingTo:end alongVector:v] autorelease];
+}
+
+- (id) initWithColor: (ccColor4B) start fadingTo: (ccColor4B) end
+{
+    return [self initWithColor:start fadingTo:end alongVector:ccp(0, -1)];
+}
+
+- (id) initWithColor: (ccColor4B) start fadingTo: (ccColor4B) end alongVector: (CGPoint) v
+{
+        endColor_.r = end.r;
+        endColor_.g = end.g;
+        endColor_.b = end.b;
+        
+        endOpacity_             = end.a;
+        startOpacity_   = start.a;
+        vector_ = v;
+        
+        start.a = 255;
+        compressedInterpolation_ = YES;
+
+        return [super initWithColor:start];
+}
+
+- (void) updateColor
+{
+    [super updateColor];
+
+        float h = ccpLength(vector_);
+    if (h == 0)
+                return;
+
+        double c = sqrt(2);
+    CGPoint u = ccp(vector_.x / h, vector_.y / h);
+
+        // Compressed Interpolation mode
+        if( compressedInterpolation_ ) {
+                float h2 = 1 / ( fabsf(u.x) + fabsf(u.y) );
+                u = ccpMult(u, h2 * (float)c);
+        }
+        
+        float opacityf = (float)opacity_/255.0f;
+        
+    ccColor4B S = {
+                color_.r,
+                color_.g,
+                color_.b,
+                startOpacity_*opacityf
+        };
+
+    ccColor4B E = {
+                endColor_.r,
+                endColor_.g,
+                endColor_.b,
+                endOpacity_*opacityf
+        };
+
+
+    // (-1, -1)
+        squareColors_[0].r = E.r + (S.r - E.r) * ((c + u.x + u.y) / (2.0f * c));
+        squareColors_[0].g = E.g + (S.g - E.g) * ((c + u.x + u.y) / (2.0f * c));
+        squareColors_[0].b = E.b + (S.b - E.b) * ((c + u.x + u.y) / (2.0f * c));
+        squareColors_[0].a = E.a + (S.a - E.a) * ((c + u.x + u.y) / (2.0f * c));
+    // (1, -1)
+        squareColors_[1].r = E.r + (S.r - E.r) * ((c - u.x + u.y) / (2.0f * c));
+        squareColors_[1].g = E.g + (S.g - E.g) * ((c - u.x + u.y) / (2.0f * c));
+        squareColors_[1].b = E.b + (S.b - E.b) * ((c - u.x + u.y) / (2.0f * c));
+        squareColors_[1].a = E.a + (S.a - E.a) * ((c - u.x + u.y) / (2.0f * c));
+        // (-1, 1)
+        squareColors_[2].r = E.r + (S.r - E.r) * ((c + u.x - u.y) / (2.0f * c));
+        squareColors_[2].g = E.g + (S.g - E.g) * ((c + u.x - u.y) / (2.0f * c));
+        squareColors_[2].b = E.b + (S.b - E.b) * ((c + u.x - u.y) / (2.0f * c));
+        squareColors_[2].a = E.a + (S.a - E.a) * ((c + u.x - u.y) / (2.0f * c));
+        // (1, 1)
+        squareColors_[3].r = E.r + (S.r - E.r) * ((c - u.x - u.y) / (2.0f * c));
+        squareColors_[3].g = E.g + (S.g - E.g) * ((c - u.x - u.y) / (2.0f * c));
+        squareColors_[3].b = E.b + (S.b - E.b) * ((c - u.x - u.y) / (2.0f * c));
+        squareColors_[3].a = E.a + (S.a - E.a) * ((c - u.x - u.y) / (2.0f * c));
+}
+
+-(ccColor3B) startColor
+{
+        return color_;
+}
+
+-(void) setStartColor:(ccColor3B)colors
+{
+        [self setColor:colors];
+}
+
+-(void) setEndColor:(ccColor3B)colors
+{
+    endColor_ = colors;
+    [self updateColor];
+}
+
+-(void) setStartOpacity: (GLubyte) o
+{
+        startOpacity_ = o;
+    [self updateColor];
+}
+
+-(void) setEndOpacity: (GLubyte) o
+{
+    endOpacity_ = o;
+    [self updateColor];
+}
+
+-(void) setVector: (CGPoint) v
+{
+    vector_ = v;
+    [self updateColor];
+}
+
+-(BOOL) compressedInterpolation
+{
+        return compressedInterpolation_;
+}
+
+-(void) setCompressedInterpolation:(BOOL)compress
+{
+        compressedInterpolation_ = compress;
+        [self updateColor];
+}
+@end
+
+#pragma mark -
+#pragma mark MultiplexLayer
+
+@implementation CCLayerMultiplex
++(id) layerWithLayers: (CCLayer*) layer, ... 
+{
+        va_list args;
+        va_start(args,layer);
+        
+        id s = [[[self alloc] initWithLayers: layer vaList:args] autorelease];
+        
+        va_end(args);
+        return s;
+}
+
+-(id) initWithLayers: (CCLayer*) layer vaList:(va_list) params
+{
+        if( (self=[super init]) ) {
+        
+                layers_ = [[NSMutableArray arrayWithCapacity:5] retain];
+                
+                [layers_ addObject: layer];
+                
+                CCLayer *l = va_arg(params,CCLayer*);
+                while( l ) {
+                        [layers_ addObject: l];
+                        l = va_arg(params,CCLayer*);
+                }
+                
+                enabledLayer_ = 0;
+                [self addChild: [layers_ objectAtIndex: enabledLayer_]];
+        }
+        
+        return self;
+}
+
+-(void) dealloc
+{
+        [layers_ release];
+        [super dealloc];
+}
+
+-(void) switchTo: (unsigned int) n
+{
+        NSAssert( n < [layers_ count], @"Invalid index in MultiplexLayer switchTo message" );
+                
+        [self removeChild: [layers_ objectAtIndex:enabledLayer_] cleanup:YES];
+        
+        enabledLayer_ = n;
+        
+        [self addChild: [layers_ objectAtIndex:n]];             
+}
+
+-(void) switchToAndReleaseMe: (unsigned int) n
+{
+        NSAssert( n < [layers_ count], @"Invalid index in MultiplexLayer switchTo message" );
+        
+        [self removeChild: [layers_ objectAtIndex:enabledLayer_] cleanup:YES];
+        
+        [layers_ replaceObjectAtIndex:enabledLayer_ withObject:[NSNull null]];
+        
+        enabledLayer_ = n;
+        
+        [self addChild: [layers_ objectAtIndex:n]];             
+}
+@end
+
+// XXX Deprecated
+@implementation CCMultiplexLayer
+@end