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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| #import "GPUImageFilter.h" | ||
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| /** Pixels with a luminance above the threshold will invert their color | ||
| */ | ||
| @interface GPUImageSolarizeFilter : GPUImageFilter | ||
| { | ||
| GLint thresholdUniform; | ||
| } | ||
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| /** Anything above this luminance will be inverted, and anything below normal. Ranges from 0.0 to 1.0, with 0.5 as the default | ||
| */ | ||
| @property(readwrite, nonatomic) CGFloat threshold; | ||
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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 +1,76 @@ | ||
| #import "GPUImageSolarizeFilter.h" | ||
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| #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE | ||
| NSString *const kGPUImageSolarizeFragmentShaderString = SHADER_STRING | ||
| ( | ||
| varying highp vec2 textureCoordinate; | ||
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| uniform sampler2D inputImageTexture; | ||
| uniform highp float threshold; | ||
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| const highp vec3 W = vec3(0.2125, 0.7154, 0.0721); | ||
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| void main() | ||
| { | ||
| highp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate); | ||
| highp float luminance = dot(textureColor.rgb, W); | ||
| highp float thresholdResult = step(luminance, threshold); | ||
| highp vec3 finalColor = abs(thresholdResult - textureColor.rgb); | ||
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| gl_FragColor = vec4(finalColor, textureColor.w); | ||
| } | ||
| ); | ||
| #else | ||
| NSString *const kGPUImageSolarizeFragmentShaderString = SHADER_STRING | ||
| ( | ||
| varying vec2 textureCoordinate; | ||
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| uniform sampler2D inputImageTexture; | ||
| uniform float threshold; | ||
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| const vec3 W = vec3(0.2125, 0.7154, 0.0721); | ||
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| void main() | ||
| { | ||
| vec4 textureColor = texture2D(inputImageTexture, textureCoordinate); | ||
| float luminance = dot(textureColor.rgb, W); | ||
| float thresholdResult = step(luminance, threshold); | ||
| vec3 finalColor = abs(thresholdResult - textureColor.rgb); | ||
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| gl_FragColor = vec4(vec3(finalColor), textureColor.w); | ||
| } | ||
| ); | ||
| #endif | ||
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| @implementation GPUImageSolarizeFilter; | ||
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| @synthesize threshold = _threshold; | ||
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| #pragma mark - | ||
| #pragma mark Initialization | ||
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| - (id)init; | ||
| { | ||
| if (!(self = [super initWithFragmentShaderFromString:kGPUImageSolarizeFragmentShaderString])) | ||
| { | ||
| return nil; | ||
| } | ||
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| thresholdUniform = [filterProgram uniformIndex:@"threshold"]; | ||
| self.threshold = 0.5; | ||
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| return self; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Accessors | ||
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| - (void)setThreshold:(CGFloat)newValue; | ||
| { | ||
| _threshold = newValue; | ||
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| [self setFloat:_threshold forUniform:thresholdUniform program:filterProgram]; | ||
| } | ||
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| @end |
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