#import "GPUImageTwoPassTextureSamplingFilter.h"
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/** A Gaussian blur filter
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Interpolated optimization based on Daniel Rákos' work at http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/
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*/
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@interface GPUImageGaussianBlurFilter : GPUImageTwoPassTextureSamplingFilter
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{
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BOOL shouldResizeBlurRadiusWithImageSize;
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CGFloat _blurRadiusInPixels;
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}
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/** A multiplier for the spacing between texels, ranging from 0.0 on up, with a default of 1.0. Adjusting this may slightly increase the blur strength, but will introduce artifacts in the result.
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*/
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@property (readwrite, nonatomic) CGFloat texelSpacingMultiplier;
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/** A radius in pixels to use for the blur, with a default of 2.0. This adjusts the sigma variable in the Gaussian distribution function.
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*/
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@property (readwrite, nonatomic) CGFloat blurRadiusInPixels;
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/** Setting these properties will allow the blur radius to scale with the size of the image. These properties are mutually exclusive; setting either will set the other to 0.
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*/
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@property (readwrite, nonatomic) CGFloat blurRadiusAsFractionOfImageWidth;
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@property (readwrite, nonatomic) CGFloat blurRadiusAsFractionOfImageHeight;
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/// The number of times to sequentially blur the incoming image. The more passes, the slower the filter.
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@property(readwrite, nonatomic) NSUInteger blurPasses;
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+ (NSString *)vertexShaderForStandardBlurOfRadius:(NSUInteger)blurRadius sigma:(CGFloat)sigma;
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+ (NSString *)fragmentShaderForStandardBlurOfRadius:(NSUInteger)blurRadius sigma:(CGFloat)sigma;
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+ (NSString *)vertexShaderForOptimizedBlurOfRadius:(NSUInteger)blurRadius sigma:(CGFloat)sigma;
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+ (NSString *)fragmentShaderForOptimizedBlurOfRadius:(NSUInteger)blurRadius sigma:(CGFloat)sigma;
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- (void)switchToVertexShader:(NSString *)newVertexShader fragmentShader:(NSString *)newFragmentShader;
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@end
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