xcode配置openGL

git clone https://github.com/BradLarson/GPUImage

先git clone 下这个库：

可以看到拉下来的代码里有一些examples：选择Mac文件夹里的SimplePhotoFilter文件夹里的SimplePhotoFilter.xcodeproj

 打开工程之后，把 GPUImageMac.xcodeproj 文件拖到 Frameworks下面。

 再点击工程里的TARGETS -> Build Phases -> Dependencies -> 添加GPUImage

 添加 TARGETS -> Build Phases -> Link Binary With Libraies -> (点击+号) 添加GPUImage.framework 和 Cocoa.framework

 在SLSDocument.m文件中写主要步骤，自己再定义一个filter文件来重写想要实现的滤镜逻辑。

- (void)windowControllerDidLoadNib:(NSWindowController *)aController
{
    [super windowControllerDidLoadNib:aController];
    // Add any code here that needs to be executed once the windowController has loaded the document's window.
    
    NSLog(@"Did load nib");
    
//    [inputPicture addTarget:imageFilter];
//    [imageFilter addTarget:self.imageView];
    
//    [inputPicture addTarget:self.imageView];
//    [inputPicture processImage];
    
    NSImage *sourceImage = [[NSImage alloc] initWithContentsOfFile:@"/Users/bella/Desktop/单步数据/IMG_0154.JPG"];
    //获取数据源
    inputPicture = [[GPUImagePicture alloc] initWithImage:sourceImage];
    //创建黑白素描滤镜
    TempFilter *sobelFilter = [[TempFilter alloc] init];
//    GPUImageBrightnessFilter *sketchFilter = [[GPUImageBrightnessFilter alloc] init];
//    sketchFilter.brightness = 0.5;
    
    //设置要渲染的区域
    [sobelFilter setupFilterForSize:sourceImage.size];
    
    
    [inputPicture addTarget:sobelFilter];
    GPUImageFilter *lasterFilter = sobelFilter;
//    [imageFilter addTarget:sketchFilter];
    
    [lasterFilter addTarget:self.imageView];
    [lasterFilter useNextFrameForImageCapture];
    
    //开始渲染
    [inputPicture processImage];
    //获取渲染后的图片
    NSImage *resultImage = [lasterFilter imageFromCurrentFramebuffer];
    NSData *imageData = [resultImage TIFFRepresentation];
    NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:imageData];
    NSDictionary *imageProps = [NSDictionary dictionaryWithObject:[NSNumber numberWithFloat:1.0] forKey:NSImageCompressionFactor];
    imageData = [imageRep representationUsingType:NSJPEGFileType properties:imageProps];
    BOOL writeResult = [imageData writeToFile:@"/Users/bella/Desktop/单步数据/output.JPG" atomically:NO];
    NSLog(@"Write result %@", @(writeResult));
    NSLog(@"");
    
    return;
}