/*

===== IMPORTANT =====

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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
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versions of this sample code may be provided with future seeds of the API or
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=====================

File: EAGLView.m
Abstract: Convenience class that wraps the CAEAGLLayer from CoreAnimation into a
UIView subclass.

Version: 1.3

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*/

#import <QuartzCore/QuartzCore.h>

#import "EAGLView.h"
#import "ES1Renderer.h"
#import "CCDirector.h"
#import "NSSet.h"
#import "CCTouch.h"

//CLASS IMPLEMENTATIONS:

#define MAX_TOUCHES     11

static EAGLView *view;
static cocos2d::CCTouch *s_pTouches[MAX_TOUCHES];

@interface EAGLView (Private)
- (BOOL) setupSurfaceWithSharegroup:(EAGLSharegroup*)sharegroup;
- (unsigned int) convertPixelFormat:(NSString*) pixelFormat;
@end

@implementation EAGLView

@synthesize surfaceSize=size_;
@synthesize pixelFormat=pixelformat_, depthFormat=depthFormat_;
@synthesize context=context_;
@synthesize touchesIntergerDict;
@synthesize indexBitsUsed;
@synthesize multiSampling=multiSampling_;

+ (Class) layerClass
{
	return [CAEAGLLayer class];
}

+ (id) viewWithFrame:(CGRect)frame
{
	return [[[[self alloc] init] initWithFrame:frame] autorelease];
}

+ (id) viewWithFrame:(CGRect)frame pixelFormat:(NSString*)format
{
	return [[[[self alloc] init] initWithFrame:frame pixelFormat:format] autorelease];
}

+ (id) viewWithFrame:(CGRect)frame pixelFormat:(NSString*)format depthFormat:(GLuint)depth
{
	return [[[[self alloc] init] 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] init] initWithFrame:frame pixelFormat:format depthFormat:depth preserveBackbuffer:retained sharegroup:sharegroup multiSampling:multisampling numberOfSamples:samples] autorelease];
}

+ (id) sharedEGLView
{
	return view;
}

- (id) init
{
    touchesIntergerDict = CFDictionaryCreateMutable(kCFAllocatorDefault, 4, NULL, NULL);
    indexBitsUsed = 0x00000000;
    return self;
}

- (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;
		}
	}

	view = self;
	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;
		}
    }
	
	view = self;
    return self;
}

-(int) getWidth
{
	CGSize bound = [self bounds].size;
	return bound.width;
}

-(int) getHeight
{
	CGSize bound = [self bounds].size;
	return bound.height;
}

-(int) getUnUsedIndex
{
    int i;
    int temp = indexBitsUsed;
    
    for (i = 0; i < MAX_TOUCHES; i++) {
        if (! (temp & 0x00000001)) {
            indexBitsUsed |= (1 <<  i);
            return i;
        }
        
        temp >>= 1;
    }
    
    // all bits are used
    return -1;
}

-(void) removeUsedIndexBit:(int) index
{
   if (index < 0 || index >= MAX_TOUCHES) {
       return;
   }
    
    unsigned int temp = 1 << index;
    temp = ~temp;
    indexBitsUsed &= temp;
}

-(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
{
    CFRelease(touchesIntergerDict);
	[renderer_ release];
	[super dealloc];
}

- (void) layoutSubviews
{
    [renderer_ resizeFromLayer:(CAEAGLLayer*)self.layer];
	size_ = [renderer_ backingSize];

	// Issue #914 #924
// 	CCDirector *director = [CCDirector sharedDirector];
// 	[director reshapeProjection:size_];
    cocos2d::CGSize size;
    size.width = size_.width;
    size.height = size_.height;
    cocos2d::CCDirector::sharedDirector()->reshapeProjection(size);

	// Avoid flicker. Issue #350
	//[director performSelectorOnMainThread:@selector(drawScene) withObject:nil waitUntilDone:YES];
	cocos2d::CCDirector::sharedDirector()->drawScene();
}

- (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];
        
        CGPoint ret;
        ret.x = (point.x - bounds.origin.x) / bounds.size.width * size_.width;
        ret.y =  (point.y - bounds.origin.y) / bounds.size.height * size_.height;
    
        return ret;
}

- (CGRect) convertRectFromViewToSurface:(CGRect)rect
{
	CGRect bounds = [self bounds];
    
        CGRect ret;
        ret.origin.x = (rect.origin.x - bounds.origin.x) / bounds.size.width * size_.width;
        ret.origin.y = (rect.origin.y - bounds.origin.y) / bounds.size.height * size_.height;
        ret.size.width = rect.size.width / bounds.size.width * size_.width;
        ret.size.height = rect.size.height / bounds.size.height * size_.height;
    
        return ret;
}

// Pass the touches to the superview
#pragma mark EAGLView - Touch Delegate

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
	cocos2d::NSSet set;
        cocos2d::CCTouch *pTouch;
    
	for (UITouch *touch in touches) {
                NSNumber *index = (NSNumber*)CFDictionaryGetValue(touchesIntergerDict, touch);
                int unUsedIndex = 0;
        
                // it is a new touch
                if (! index) {
                    unUsedIndex = [self getUnUsedIndex];
                    
                    // The touches is more than MAX_TOUCHES ?
                    if (unUsedIndex == -1) {
                        return;
                    }
                    
                    pTouch = s_pTouches[unUsedIndex] = new cocos2d::CCTouch();
                }

		float x = [touch locationInView: [touch view]].x;
		float y = [touch locationInView: [touch view]].y;
		pTouch->SetTouchInfo(0, x, y);
        
                CFDictionaryAddValue(touchesIntergerDict, touch, [NSNumber numberWithInt:unUsedIndex]);
		
		set.addObject(pTouch);
	}
	
	cocos2d::CCDirector::sharedDirector()->getOpenGLView()->touchesBegan(&set);
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
	cocos2d::NSSet set;
	for (UITouch *touch in touches) {
		NSNumber *index = (NSNumber*)CFDictionaryGetValue(touchesIntergerDict, touch);
                if (! index) {
                    // if the index doesn't exist, it is an error
                    return;
                }
                
                cocos2d::CCTouch *pTouch = s_pTouches[[index intValue]];
                if (! pTouch) {
                    // if the pTouch is null, it is an error
                    return;
                }
        
		float x = [touch locationInView: [touch view]].x;
		float y = [touch locationInView: [touch view]].y;
		pTouch->SetTouchInfo(0, x, y);
		
		set.addObject(pTouch);
	}
	
	cocos2d::CCDirector::sharedDirector()->getOpenGLView()->touchesMoved(&set);
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
	cocos2d::NSSet set;
	for (UITouch *touch in touches) {
            NSNumber *index = (NSNumber*)CFDictionaryGetValue(touchesIntergerDict, touch);
            if (! index) {
                // if the index doesn't exist, it is an error
                return;
            }
        
                cocos2d::CCTouch *pTouch = s_pTouches[[index intValue]];
                if (! pTouch) {
                    // if the pTouch is null, it is an error
                    return;
                }
        
		float x = [touch locationInView: [touch view]].x;
		float y = [touch locationInView: [touch view]].y;
		pTouch->SetTouchInfo(0, x, y);
		
		set.addObject(pTouch);
                CFDictionaryRemoveValue(touchesIntergerDict, touch);
                pTouch->release();
                s_pTouches[[index intValue]] = NULL;
                [self removeUsedIndexBit:[index intValue]];
	}
	
	cocos2d::CCDirector::sharedDirector()->getOpenGLView()->touchesEnded(&set);
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
	cocos2d::NSSet set;
	for (UITouch *touch in touches) {
            NSNumber *index = (NSNumber*)CFDictionaryGetValue(touchesIntergerDict, touch);
            if (! index) {
                // if the index doesn't exist, it is an error
                return;
            }
        
                cocos2d::CCTouch *pTouch = s_pTouches[[index intValue]];
                if (! pTouch) {
                    // if the pTouch is null, it is an error
                    return;
                }
        
		float x = [touch locationInView: [touch view]].x;
		float y = [touch locationInView: [touch view]].y;
		pTouch->SetTouchInfo(0, x, y);
		
		set.addObject(pTouch);
                CFDictionaryRemoveValue(touchesIntergerDict, touch);
                pTouch->release();
                s_pTouches[[index intValue]] = NULL;
                [self removeUsedIndexBit:[index intValue]];
	}
	
	cocos2d::CCDirector::sharedDirector()->getOpenGLView()->touchesCancelled(&set);
}

@end