/*

===== 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
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=====================

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

Version: 1.3

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*/

#import <UIKit/UIKit.h>
#import <OpenGLES/EAGL.h>
#import <OpenGLES/EAGLDrawable.h>
#import <OpenGLES/ES1/gl.h>
#import <OpenGLES/ES1/glext.h>

//CLASSES:

@class EAGLView;

//PROTOCOLS:

@protocol EAGLViewDelegate <NSObject>
- (void) didResizeEAGLSurfaceForView:(EAGLView*)view; //Called whenever the EAGL surface has been resized
@end

@protocol EAGLTouchDelegate <NSObject>
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event;
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event;
@end

//CLASS INTERFACE:

/** EAGLView Class
 * This class wraps the CAEAGLLayer from CoreAnimation into a convenient UIView subclass.
 * The view content is basically an EAGL surface you render your OpenGL scene into.
 * Note that setting the view non-opaque will only work if the EAGL surface has an alpha channel.
 */
@interface EAGLView : UIView
{
@private
	NSString*				_format;
	GLuint					_depthFormat;
	BOOL					_autoresize;
	EAGLContext				*_context;
	GLuint					_framebuffer;
	GLuint					_renderbuffer;
	GLuint					_depthBuffer;
	CGSize					_size;
	BOOL					_hasBeenCurrent;
	id<EAGLViewDelegate>	_delegate;
	id<EAGLTouchDelegate>   touchDelegate;
}
- (id) initWithFrame:(CGRect)frame; //These also set the current context
- (id) initWithFrame:(CGRect)frame pixelFormat:(NSString*)format;
- (id) initWithFrame:(CGRect)frame pixelFormat:(NSString*)format depthFormat:(GLuint)depth preserveBackbuffer:(BOOL)retained;

@property(readonly) GLuint framebuffer;
@property(readonly) NSString* pixelFormat;
@property(readonly) GLuint depthFormat;
@property(readonly) EAGLContext *context;

@property BOOL autoresizesSurface; //NO by default - Set to YES to have the EAGL surface automatically resized when the view bounds change, otherwise the EAGL surface contents is rendered scaled
@property(readonly, nonatomic) CGSize surfaceSize;

@property(assign) id<EAGLViewDelegate> delegate;
@property(assign) id<EAGLTouchDelegate> touchDelegate;

- (void) setAutoresizesEAGLSurface:(BOOL)autoresizesEAGLSurface;

- (void) setCurrentContext;
- (BOOL) isCurrentContext;
- (void) clearCurrentContext;

- (void) swapBuffers; //This also checks the current OpenGL error and logs an error if needed

- (CGPoint) convertPointFromViewToSurface:(CGPoint)point;
- (CGRect) convertRectFromViewToSurface:(CGRect)rect;
@end
