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framework/Source/GPUImageTwoInputCrossTextureSamplingFilter.h
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framework/Source/GPUImageTwoInputCrossTextureSamplingFilter.m
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,13 @@ | ||
| #import "GPUImageFilter.h" | ||
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| @interface GPUImageZoomBlurFilter : GPUImageFilter | ||
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| /** A multiplier for the blur size, ranging from 0.0 on up, with a default of 1.0 | ||
| */ | ||
| @property (readwrite, nonatomic) CGFloat blurSize; | ||
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| /** The normalized center of the blur. (0.5, 0.5) by default | ||
| */ | ||
| @property (readwrite, nonatomic) CGPoint blurCenter; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
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| #import "GPUImageZoomBlurFilter.h" | ||
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| NSString *const kGPUImageZoomBlurFragmentShaderString = SHADER_STRING | ||
| ( | ||
| varying highp vec2 textureCoordinate; | ||
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| uniform sampler2D inputImageTexture; | ||
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| uniform highp vec2 blurCenter; | ||
| uniform highp float blurSize; | ||
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| void main() | ||
| { | ||
| // TODO: Do a more intelligent scaling based on resolution here | ||
| highp vec2 samplingOffset = 1.0/100.0 * (blurCenter - textureCoordinate) * blurSize; | ||
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| lowp vec4 fragmentColor = texture2D(inputImageTexture, textureCoordinate) * 0.18; | ||
| fragmentColor += texture2D(inputImageTexture, textureCoordinate + samplingOffset) * 0.15; | ||
| fragmentColor += texture2D(inputImageTexture, textureCoordinate + (2.0 * samplingOffset)) * 0.12; | ||
| fragmentColor += texture2D(inputImageTexture, textureCoordinate + (3.0 * samplingOffset)) * 0.09; | ||
| fragmentColor += texture2D(inputImageTexture, textureCoordinate + (4.0 * samplingOffset)) * 0.05; | ||
| fragmentColor += texture2D(inputImageTexture, textureCoordinate - samplingOffset) * 0.15; | ||
| fragmentColor += texture2D(inputImageTexture, textureCoordinate - (2.0 * samplingOffset)) * 0.12; | ||
| fragmentColor += texture2D(inputImageTexture, textureCoordinate - (3.0 * samplingOffset)) * 0.09; | ||
| fragmentColor += texture2D(inputImageTexture, textureCoordinate - (4.0 * samplingOffset)) * 0.05; | ||
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| gl_FragColor = fragmentColor; | ||
| } | ||
| ); | ||
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| @interface GPUImageZoomBlurFilter() | ||
| { | ||
| GLint blurSizeUniform, blurCenterUniform; | ||
| } | ||
| @end | ||
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| @implementation GPUImageZoomBlurFilter | ||
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| @synthesize blurSize = _blurSize; | ||
| @synthesize blurCenter = _blurCenter; | ||
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| #pragma mark - | ||
| #pragma mark Initialization and teardown | ||
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| - (id)init; | ||
| { | ||
| if (!(self = [super initWithFragmentShaderFromString:kGPUImageZoomBlurFragmentShaderString])) | ||
| { | ||
| return nil; | ||
| } | ||
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| blurSizeUniform = [filterProgram uniformIndex:@"blurSize"]; | ||
| blurCenterUniform = [filterProgram uniformIndex:@"blurCenter"]; | ||
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| self.blurSize = 1.0; | ||
| self.blurCenter = CGPointMake(0.5, 0.5); | ||
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| return self; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Accessors | ||
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| - (void)setInputRotation:(GPUImageRotationMode)newInputRotation atIndex:(NSInteger)textureIndex; | ||
| { | ||
| [super setInputRotation:newInputRotation atIndex:textureIndex]; | ||
| [self setBlurCenter:self.blurCenter]; | ||
| } | ||
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| - (void)setBlurSize:(CGFloat)newValue; | ||
| { | ||
| _blurSize = newValue; | ||
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| [self setFloat:_blurSize forUniform:blurSizeUniform program:filterProgram]; | ||
| } | ||
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| - (void)setBlurCenter:(CGPoint)newValue; | ||
| { | ||
| _blurCenter = newValue; | ||
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| CGPoint rotatedPoint = [self rotatedPoint:_blurCenter forRotation:inputRotation]; | ||
| [self setPoint:rotatedPoint forUniform:blurCenterUniform program:filterProgram]; | ||
| } | ||
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| @end |