/*

File: FrameReader.h

Abstract: Interface for the FrameReader class which allows you to grab frames

from an OpenGL context. The FrameReader is initialized with an OpenGL context 

to read from and the dimensions of the frames to grab. The class contains 

code for asynchronous texture fetching to grab the frames from the OpenGL 

context. Asynchronous texture fetching improves performance significantly. 

Frame grabbing is performed by calling -readScreenAsyncOnSeparateThread

for asynchronous capture.

Version: 1.0

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*/

#import <Cocoa/Cocoa.h>

#import <Quartz/Quartz.h>

#import "Queue.h"

#import "QueueController.h"

@interface FrameReader : NSObject

{

@private

    NSOpenGLContext*            mGlContext;

    unsigned                mWidth, mHeight;

    unsigned long           mTextureName;

    CVPixelBufferPoolRef        mBufferPool;

    CVPixelBufferRef            mPixelBuffer;

    unsigned char*          mBaseAddress;

    unsigned                mBufferRowBytes;

    NSTimeInterval          mStartTime;

    NSTimeInterval          mRecordTime;

    QueueController *           mQueueController;

}

- (id)initWithOpenGLContext:(NSOpenGLContext*)context pixelsWide:(unsigned)width pixelsHigh:(unsigned)height queueController:(QueueController *)controller;

- (BOOL)readScreenAsyncBegin;

- (CVPixelBufferRef)readScreenAsyncFinish;

- (void)readScreenAsyncOnSeparateThread;

- (NSTimeInterval)bufferReadTime;

- (void)setBufferReadTime:(NSTimeInterval)aStartTime;

- (QueueController *)queueController;

@end