/*

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

Version: 1.3

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*/

/*
 Modified for cocos2d project
 */

// 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 "../../ccMacros.h"
#ifdef __CC_PLATFORM_IOS

#import <QuartzCore/QuartzCore.h>

#import "CCGLView.h"
#import "CCES2Renderer.h"
#import "../../CCDirector.h"
#import "../../ccMacros.h"
#import "../../CCConfiguration.h"
#import "../../Support/OpenGL_Internal.h"


//CLASS IMPLEMENTATIONS:

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

@implementation CCGLView

@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;
		}

		CHECK_GL_ERROR_DEBUG();
	}

	return self;
}

-(id) initWithCoder:(NSCoder *)aDecoder
{
	if( (self = [super initWithCoder:aDecoder]) ) {

		CAEAGLLayer* eaglLayer = (CAEAGLLayer*)[self layer];

		_pixelformat = kEAGLColorFormatRGB565;
		_depthFormat = 0; // GL_DEPTH_COMPONENT24;
		_multiSampling= NO;
		_requestedSamples = 0;
		_size = [eaglLayer bounds].size;

		if( ! [self setupSurfaceWithSharegroup:nil] ) {
			[self release];
			return nil;
		}

		CHECK_GL_ERROR_DEBUG();
    }

    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];

	// ES2 renderer only
	_renderer = [[CCES2Renderer alloc] initWithDepthFormat:_depthFormat
										 withPixelFormat:[self convertPixelFormat:_pixelformat]
										  withSharegroup:sharegroup
									   withMultiSampling:_multiSampling
									 withNumberOfSamples:_requestedSamples];

	NSAssert( _renderer, @"OpenGL ES 2.0 is required");

	if (!_renderer)
		return NO;

	_context = [_renderer context];

	_discardFramebufferSupported = [[CCConfiguration sharedConfiguration] supportsDiscardFramebuffer];

	CHECK_GL_ERROR_DEBUG();

	return YES;
}

- (void) dealloc
{
	CCLOGINFO(@"cocos2d: deallocing %@", self);

	[_renderer release];
	[super dealloc];
}

- (void) layoutSubviews
{
	[_renderer resizeFromLayer:(CAEAGLLayer*)self.layer];

	_size = [_renderer backingSize];

	// Issue #914 #924
	CCDirector *director = [CCDirector sharedDirector];
	[director reshapeProjection:_size];

	// Avoid flicker. Issue #350
	// Only draw if there is something to draw, otherwise it actually creates a flicker of the current glClearColor
//	if(director.runningScene){
//		NSThread *thread = [director runningThread];
//		[director performSelector:@selector(drawScene) onThread:thread withObject:nil waitUntilDone:YES];
//	}
}

- (void) swapBuffers
{
	// IMPORTANT:
	// - preconditions
	//	-> _context MUST be the OpenGL context
	//	-> renderbuffer_ must be the the RENDER BUFFER

	if (_multiSampling)
	{
		/* Resolve from msaaFramebuffer to resolveFramebuffer */
		//glDisable(GL_SCISSOR_TEST);
		glBindFramebuffer(GL_READ_FRAMEBUFFER_APPLE, [_renderer msaaFrameBuffer]);
		glBindFramebuffer(GL_DRAW_FRAMEBUFFER_APPLE, [_renderer defaultFrameBuffer]);
		glResolveMultisampleFramebufferAPPLE();
	}

	if( _discardFramebufferSupported)
	{
		if (_multiSampling)
		{
			if (_depthFormat)
			{
				GLenum attachments[] = {GL_COLOR_ATTACHMENT0, GL_DEPTH_ATTACHMENT};
				glDiscardFramebufferEXT(GL_READ_FRAMEBUFFER_APPLE, 2, attachments);
			}
			else
			{
				GLenum attachments[] = {GL_COLOR_ATTACHMENT0};
				glDiscardFramebufferEXT(GL_READ_FRAMEBUFFER_APPLE, 1, attachments);
			}

			glBindRenderbuffer(GL_RENDERBUFFER, [_renderer colorRenderBuffer]);

		}

		// not MSAA
		else if (_depthFormat ) {
			GLenum attachments[] = { GL_DEPTH_ATTACHMENT};
			glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, attachments);
		}
	}

	if(![_context presentRenderbuffer:GL_RENDERBUFFER])
		CCLOG(@"cocos2d: Failed to swap renderbuffer in %s\n", __FUNCTION__);

	// We can safely re-bind the framebuffer here, since this will be the
	// 1st instruction of the new main loop
	if( _multiSampling )
		glBindFramebuffer(GL_FRAMEBUFFER, [_renderer msaaFrameBuffer]);

	CHECK_GL_ERROR_DEBUG();
}

-(void) lockOpenGLContext
{
	// unused on iOS
}

-(void) unlockOpenGLContext
{
	// unused on iOS
}

- (unsigned int) convertPixelFormat:(NSString*) pixelFormat
{
	// define the pixel format
	GLenum pFormat;


	if([pixelFormat isEqualToString:@"EAGLColorFormat565"])
		pFormat = GL_RGB565;
	else
		pFormat = GL_RGBA8_OES;

	return pFormat;
}

#pragma mark CCGLView - 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 CCGLView - 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 // __CC_PLATFORM_IOS
