纹理转PixelBuffer 调试用

最新推荐文章于 2022-10-10 10:50:35 发布

原创最新推荐文章于 2022-10-10 10:50:35 发布 · 3.5k 阅读

CC 4.0 BY-SA版权

本文介绍了一个Objective-C方法，用于根据指定尺寸创建兼容OpenGL ES的CVPixelBuffer，并利用CIContext将CIImage渲染到该缓冲区中。此方法首先定义了必要的属性和配置选项，然后创建缓冲区，最后使用当前的EAGLContext进行渲染。

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-(CVPixelBufferRef)createPixelBufferWithSize:(CGSize)size {
    const void *keys[] = {
        kCVPixelBufferOpenGLESCompatibilityKey,
        kCVPixelBufferIOSurfacePropertiesKey,
    };
    const void *values[] = {
        (__bridge const void *)([NSNumber numberWithBool:YES]),
        (__bridge const void *)([NSDictionary dictionary])
    };
    
    OSType bufferPixelFormat = kCVPixelFormatType_32BGRA;
    
    CFDictionaryRef optionsDictionary = CFDictionaryCreate(NULL, keys, values, 2, NULL, NULL);
    
    CVPixelBufferRef pixelBuffer = NULL;
    CVPixelBufferCreate(kCFAllocatorDefault,
                        size.width,
                        size.height,
                        bufferPixelFormat,
                        optionsDictionary,
                        &pixelBuffer);
    
    CFRelease(optionsDictionary);
    
    return pixelBuffer;
}

    CVPixelBufferRef pixelBuffer1 = [self createPixelBufferWithSize: CGSizeMake(540, 960)];

    static CIContext *_ciContext;
    CIImage *outputImage = [CIImage imageWithTexture:textureId size:CGSizeMake(540, 960) flipped:YES colorSpace:NULL];
    if( outputImage != nil) {
        if( _ciContext == nil) {
            _ciContext = [CIContext contextWithEAGLContext: [EAGLContext currentContext]  options:@{kCIContextWorkingColorSpace : [NSNull null]} ];
        }
       
        [_ciContext render: outputImage toCVPixelBuffer: pixelBuffer1  bounds:[outputImage extent] colorSpace:NULL];
    }