#import "GPUImageRGBDilationFilter.h"
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#import "GPUImageDilationFilter.h"
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#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
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NSString *const kGPUImageRGBDilationRadiusOneFragmentShaderString = SHADER_STRING
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(
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precision highp float;
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varying vec2 centerTextureCoordinate;
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varying vec2 oneStepPositiveTextureCoordinate;
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varying vec2 oneStepNegativeTextureCoordinate;
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uniform sampler2D inputImageTexture;
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void main()
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{
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lowp vec4 centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate);
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lowp vec4 oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate);
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lowp vec4 oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate);
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lowp vec4 maxValue = max(centerIntensity, oneStepPositiveIntensity);
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gl_FragColor = max(maxValue, oneStepNegativeIntensity);
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}
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);
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NSString *const kGPUImageRGBDilationRadiusTwoFragmentShaderString = SHADER_STRING
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(
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precision highp float;
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varying vec2 centerTextureCoordinate;
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varying vec2 oneStepPositiveTextureCoordinate;
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varying vec2 oneStepNegativeTextureCoordinate;
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varying vec2 twoStepsPositiveTextureCoordinate;
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varying vec2 twoStepsNegativeTextureCoordinate;
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uniform sampler2D inputImageTexture;
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void main()
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{
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lowp vec4 centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate);
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lowp vec4 oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate);
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lowp vec4 oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate);
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lowp vec4 twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate);
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lowp vec4 twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate);
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lowp vec4 maxValue = max(centerIntensity, oneStepPositiveIntensity);
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maxValue = max(maxValue, oneStepNegativeIntensity);
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maxValue = max(maxValue, twoStepsPositiveIntensity);
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maxValue = max(maxValue, twoStepsNegativeIntensity);
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gl_FragColor = max(maxValue, twoStepsNegativeIntensity);
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}
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);
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NSString *const kGPUImageRGBDilationRadiusThreeFragmentShaderString = SHADER_STRING
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(
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precision highp float;
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varying vec2 centerTextureCoordinate;
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varying vec2 oneStepPositiveTextureCoordinate;
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varying vec2 oneStepNegativeTextureCoordinate;
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varying vec2 twoStepsPositiveTextureCoordinate;
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varying vec2 twoStepsNegativeTextureCoordinate;
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varying vec2 threeStepsPositiveTextureCoordinate;
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varying vec2 threeStepsNegativeTextureCoordinate;
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uniform sampler2D inputImageTexture;
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void main()
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{
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lowp vec4 centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate);
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lowp vec4 oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate);
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lowp vec4 oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate);
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lowp vec4 twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate);
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lowp vec4 twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate);
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lowp vec4 threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate);
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lowp vec4 threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate);
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lowp vec4 maxValue = max(centerIntensity, oneStepPositiveIntensity);
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maxValue = max(maxValue, oneStepNegativeIntensity);
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maxValue = max(maxValue, twoStepsPositiveIntensity);
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maxValue = max(maxValue, twoStepsNegativeIntensity);
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maxValue = max(maxValue, threeStepsPositiveIntensity);
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gl_FragColor = max(maxValue, threeStepsNegativeIntensity);
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}
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);
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NSString *const kGPUImageRGBDilationRadiusFourFragmentShaderString = SHADER_STRING
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(
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precision highp float;
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varying vec2 centerTextureCoordinate;
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varying vec2 oneStepPositiveTextureCoordinate;
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varying vec2 oneStepNegativeTextureCoordinate;
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varying vec2 twoStepsPositiveTextureCoordinate;
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varying vec2 twoStepsNegativeTextureCoordinate;
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varying vec2 threeStepsPositiveTextureCoordinate;
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varying vec2 threeStepsNegativeTextureCoordinate;
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varying vec2 fourStepsPositiveTextureCoordinate;
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varying vec2 fourStepsNegativeTextureCoordinate;
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uniform sampler2D inputImageTexture;
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void main()
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{
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lowp vec4 centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate);
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lowp vec4 oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate);
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lowp vec4 oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate);
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lowp vec4 twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate);
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lowp vec4 twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate);
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lowp vec4 threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate);
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lowp vec4 threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate);
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lowp vec4 fourStepsPositiveIntensity = texture2D(inputImageTexture, fourStepsPositiveTextureCoordinate);
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lowp vec4 fourStepsNegativeIntensity = texture2D(inputImageTexture, fourStepsNegativeTextureCoordinate);
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lowp vec4 maxValue = max(centerIntensity, oneStepPositiveIntensity);
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maxValue = max(maxValue, oneStepNegativeIntensity);
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maxValue = max(maxValue, twoStepsPositiveIntensity);
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maxValue = max(maxValue, twoStepsNegativeIntensity);
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maxValue = max(maxValue, threeStepsPositiveIntensity);
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maxValue = max(maxValue, threeStepsNegativeIntensity);
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maxValue = max(maxValue, fourStepsPositiveIntensity);
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gl_FragColor = max(maxValue, fourStepsNegativeIntensity);
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}
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);
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#else
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NSString *const kGPUImageRGBDilationRadiusOneFragmentShaderString = SHADER_STRING
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(
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varying vec2 centerTextureCoordinate;
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varying vec2 oneStepPositiveTextureCoordinate;
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varying vec2 oneStepNegativeTextureCoordinate;
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uniform sampler2D inputImageTexture;
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void main()
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{
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vec4 centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate);
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vec4 oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate);
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vec4 oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate);
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vec4 maxValue = max(centerIntensity, oneStepPositiveIntensity);
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gl_FragColor = max(maxValue, oneStepNegativeIntensity);
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}
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);
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NSString *const kGPUImageRGBDilationRadiusTwoFragmentShaderString = SHADER_STRING
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(
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varying vec2 centerTextureCoordinate;
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varying vec2 oneStepPositiveTextureCoordinate;
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varying vec2 oneStepNegativeTextureCoordinate;
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varying vec2 twoStepsPositiveTextureCoordinate;
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varying vec2 twoStepsNegativeTextureCoordinate;
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uniform sampler2D inputImageTexture;
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void main()
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{
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vec4 centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate);
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vec4 oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate);
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vec4 oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate);
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vec4 twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate);
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vec4 twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate);
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vec4 maxValue = max(centerIntensity, oneStepPositiveIntensity);
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maxValue = max(maxValue, oneStepNegativeIntensity);
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maxValue = max(maxValue, twoStepsPositiveIntensity);
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maxValue = max(maxValue, twoStepsNegativeIntensity);
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gl_FragColor = max(maxValue, twoStepsNegativeIntensity);
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}
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);
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NSString *const kGPUImageRGBDilationRadiusThreeFragmentShaderString = SHADER_STRING
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(
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varying vec2 centerTextureCoordinate;
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varying vec2 oneStepPositiveTextureCoordinate;
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varying vec2 oneStepNegativeTextureCoordinate;
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varying vec2 twoStepsPositiveTextureCoordinate;
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varying vec2 twoStepsNegativeTextureCoordinate;
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varying vec2 threeStepsPositiveTextureCoordinate;
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varying vec2 threeStepsNegativeTextureCoordinate;
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uniform sampler2D inputImageTexture;
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void main()
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{
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vec4 centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate);
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vec4 oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate);
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vec4 oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate);
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vec4 twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate);
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vec4 twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate);
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vec4 threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate);
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vec4 threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate);
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vec4 maxValue = max(centerIntensity, oneStepPositiveIntensity);
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maxValue = max(maxValue, oneStepNegativeIntensity);
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maxValue = max(maxValue, twoStepsPositiveIntensity);
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maxValue = max(maxValue, twoStepsNegativeIntensity);
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maxValue = max(maxValue, threeStepsPositiveIntensity);
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gl_FragColor = max(maxValue, threeStepsNegativeIntensity);
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}
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);
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NSString *const kGPUImageRGBDilationRadiusFourFragmentShaderString = SHADER_STRING
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(
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varying vec2 centerTextureCoordinate;
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varying vec2 oneStepPositiveTextureCoordinate;
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varying vec2 oneStepNegativeTextureCoordinate;
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varying vec2 twoStepsPositiveTextureCoordinate;
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varying vec2 twoStepsNegativeTextureCoordinate;
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varying vec2 threeStepsPositiveTextureCoordinate;
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varying vec2 threeStepsNegativeTextureCoordinate;
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varying vec2 fourStepsPositiveTextureCoordinate;
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varying vec2 fourStepsNegativeTextureCoordinate;
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uniform sampler2D inputImageTexture;
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void main()
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{
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vec4 centerIntensity = texture2D(inputImageTexture, centerTextureCoordinate);
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vec4 oneStepPositiveIntensity = texture2D(inputImageTexture, oneStepPositiveTextureCoordinate);
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vec4 oneStepNegativeIntensity = texture2D(inputImageTexture, oneStepNegativeTextureCoordinate);
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vec4 twoStepsPositiveIntensity = texture2D(inputImageTexture, twoStepsPositiveTextureCoordinate);
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vec4 twoStepsNegativeIntensity = texture2D(inputImageTexture, twoStepsNegativeTextureCoordinate);
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vec4 threeStepsPositiveIntensity = texture2D(inputImageTexture, threeStepsPositiveTextureCoordinate);
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vec4 threeStepsNegativeIntensity = texture2D(inputImageTexture, threeStepsNegativeTextureCoordinate);
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vec4 fourStepsPositiveIntensity = texture2D(inputImageTexture, fourStepsPositiveTextureCoordinate);
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vec4 fourStepsNegativeIntensity = texture2D(inputImageTexture, fourStepsNegativeTextureCoordinate);
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vec4 maxValue = max(centerIntensity, oneStepPositiveIntensity);
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maxValue = max(maxValue, oneStepNegativeIntensity);
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maxValue = max(maxValue, twoStepsPositiveIntensity);
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maxValue = max(maxValue, twoStepsNegativeIntensity);
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maxValue = max(maxValue, threeStepsPositiveIntensity);
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maxValue = max(maxValue, threeStepsNegativeIntensity);
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maxValue = max(maxValue, fourStepsPositiveIntensity);
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gl_FragColor = max(maxValue, fourStepsNegativeIntensity);
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}
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);
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#endif
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@implementation GPUImageRGBDilationFilter
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#pragma mark -
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#pragma mark Initialization and teardown
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- (id)initWithRadius:(NSUInteger)dilationRadius;
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{
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NSString *fragmentShaderForThisRadius = nil;
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NSString *vertexShaderForThisRadius = nil;
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switch (dilationRadius)
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{
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case 0:
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case 1:
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{
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vertexShaderForThisRadius = kGPUImageDilationRadiusOneVertexShaderString;
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fragmentShaderForThisRadius = kGPUImageRGBDilationRadiusOneFragmentShaderString;
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}; break;
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case 2:
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{
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vertexShaderForThisRadius = kGPUImageDilationRadiusTwoVertexShaderString;
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fragmentShaderForThisRadius = kGPUImageRGBDilationRadiusTwoFragmentShaderString;
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}; break;
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case 3:
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{
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vertexShaderForThisRadius = kGPUImageDilationRadiusThreeVertexShaderString;
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fragmentShaderForThisRadius = kGPUImageRGBDilationRadiusThreeFragmentShaderString;
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}; break;
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case 4:
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{
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vertexShaderForThisRadius = kGPUImageDilationRadiusFourVertexShaderString;
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fragmentShaderForThisRadius = kGPUImageRGBDilationRadiusFourFragmentShaderString;
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}; break;
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default:
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{
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vertexShaderForThisRadius = kGPUImageDilationRadiusFourVertexShaderString;
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fragmentShaderForThisRadius = kGPUImageRGBDilationRadiusFourFragmentShaderString;
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}; break;
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}
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if (!(self = [super initWithFirstStageVertexShaderFromString:vertexShaderForThisRadius firstStageFragmentShaderFromString:fragmentShaderForThisRadius secondStageVertexShaderFromString:vertexShaderForThisRadius secondStageFragmentShaderFromString:fragmentShaderForThisRadius]))
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{
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return nil;
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}
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return self;
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}
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- (id)init;
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{
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if (!(self = [self initWithRadius:1]))
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{
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return nil;
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}
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return self;
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}
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@end
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