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examples/FilterShowcase/FilterShowcase/ShowcaseFilterViewController.h
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| #import "GPUImageFilter.h" | ||
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| @interface GPUImageSwirlFilter : GPUImageFilter | ||
| { | ||
| GLint radiusUniform, centerUniform, angleUniform; | ||
| } | ||
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| // The center about which to apply the distortion, with a default of (0.5, 0.5) | ||
| @property(readwrite, nonatomic) CGPoint center; | ||
| // The radius of the distortion, ranging from 0.0 to 1.0, with a default of 0.5 | ||
| @property(readwrite, nonatomic) CGFloat radius; | ||
| // The amount of distortion to apply, with a minimum of 0.0 and a default of 1.0 | ||
| @property(readwrite, nonatomic) CGFloat angle; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,98 @@ | ||
| #import "GPUImageSwirlFilter.h" | ||
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| // Adapted from the shader example here: http://www.geeks3d.com/20110428/shader-library-swirl-post-processing-filter-in-glsl/ | ||
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| NSString *const kGPUImageSwirlFragmentShaderString = SHADER_STRING | ||
| ( | ||
| varying highp vec2 textureCoordinate; | ||
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| uniform sampler2D inputImageTexture; | ||
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| uniform highp vec2 center; | ||
| uniform highp float radius; | ||
| uniform highp float angle; | ||
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| void main() | ||
| { | ||
| highp vec2 textureCoordinateToUse = textureCoordinate; | ||
| highp float dist = distance(center, textureCoordinate); | ||
| textureCoordinateToUse -= center; | ||
| if (dist < radius) | ||
| { | ||
| highp float percent = (radius - dist) / radius; | ||
| // highp float theta = percent * angle; | ||
| highp float theta = percent * percent * angle * 8.0; | ||
| highp float s = sin(theta); | ||
| highp float c = cos(theta); | ||
| textureCoordinateToUse = vec2(dot(textureCoordinateToUse, vec2(c, -s)), dot(textureCoordinateToUse, vec2(s, c))); | ||
| } | ||
| textureCoordinateToUse += center; | ||
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| gl_FragColor = texture2D(inputImageTexture, textureCoordinateToUse ); | ||
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| } | ||
| ); | ||
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| @implementation GPUImageSwirlFilter | ||
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| #pragma mark - | ||
| #pragma mark Initialization and teardown | ||
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| - (id)init; | ||
| { | ||
| if (!(self = [super initWithFragmentShaderFromString:kGPUImageSwirlFragmentShaderString])) | ||
| { | ||
| return nil; | ||
| } | ||
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| radiusUniform = [filterProgram uniformIndex:@"radius"]; | ||
| angleUniform = [filterProgram uniformIndex:@"angle"]; | ||
| centerUniform = [filterProgram uniformIndex:@"center"]; | ||
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| self.radius = 0.5; | ||
| self.angle = 1.0; | ||
| self.center = CGPointMake(0.5, 0.5); | ||
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| return self; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Accessors | ||
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| @synthesize center = _center; | ||
| @synthesize radius = _radius; | ||
| @synthesize angle = _angle; | ||
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| - (void)setRadius:(CGFloat)newValue; | ||
| { | ||
| _radius = newValue; | ||
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| [GPUImageOpenGLESContext useImageProcessingContext]; | ||
| [filterProgram use]; | ||
| glUniform1f(radiusUniform, _radius); | ||
| } | ||
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| - (void)setAngle:(CGFloat)newValue; | ||
| { | ||
| _angle = newValue; | ||
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| [GPUImageOpenGLESContext useImageProcessingContext]; | ||
| [filterProgram use]; | ||
| glUniform1f(angleUniform, _angle); | ||
| } | ||
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| - (void)setCenter:(CGPoint)newValue; | ||
| { | ||
| _center = newValue; | ||
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| [GPUImageOpenGLESContext useImageProcessingContext]; | ||
| [filterProgram use]; | ||
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| GLfloat centerPosition[2]; | ||
| centerPosition[0] = _center.x; | ||
| centerPosition[1] = _center.y; | ||
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| glUniform2fv(centerUniform, 1, centerPosition); | ||
| } | ||
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| @end |