#import "GPUImageFilter.h"
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typedef enum { kGPUImageHistogramRed, kGPUImageHistogramGreen, kGPUImageHistogramBlue, kGPUImageHistogramRGB, kGPUImageHistogramLuminance} GPUImageHistogramType;
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@interface GPUImageHistogramFilter : GPUImageFilter
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{
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GPUImageHistogramType histogramType;
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GLubyte *vertexSamplingCoordinates;
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GLProgram *secondFilterProgram, *thirdFilterProgram;
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GLint secondFilterPositionAttribute, thirdFilterPositionAttribute;
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}
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// Rather than sampling every pixel, this dictates what fraction of the image is sampled. By default, this is 16 with a minimum of 1.
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@property(readwrite, nonatomic) NSUInteger downsamplingFactor;
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// Initialization and teardown
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- (id)initWithHistogramType:(GPUImageHistogramType)newHistogramType;
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- (void)initializeSecondaryAttributes;
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@end
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