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Added a false color filter. Incorporated the shadows and highlights f…
…ilter into the showcase.
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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 GPUImageFalseColorFilter : GPUImageFilter | ||
| { | ||
| GLint firstColorUniform, secondColorUniform; | ||
| } | ||
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| // The first and second colors specify what colors replace the dark and light areas of the image, respectively. The defaults are (0.0, 0.0, 0.5) amd (1.0, 0.0, 0.0). | ||
| @property(readwrite, nonatomic) GPUVector4 firstColor; | ||
| @property(readwrite, nonatomic) GPUVector4 secondColor; | ||
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| - (void)setFirstColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent; | ||
| - (void)setSecondColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| #import "GPUImageFalseColorFilter.h" | ||
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| NSString *const kGPUFalseColorFragmentShaderString = SHADER_STRING | ||
| ( | ||
| precision lowp float; | ||
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| varying highp vec2 textureCoordinate; | ||
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| uniform sampler2D inputImageTexture; | ||
| uniform float intensity; | ||
| uniform vec3 firstColor; | ||
| uniform vec3 secondColor; | ||
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| const mediump vec3 luminanceWeighting = vec3(0.2125, 0.7154, 0.0721); | ||
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| void main() | ||
| { | ||
| lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate); | ||
| float luminance = dot(textureColor.rgb, luminanceWeighting); | ||
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| gl_FragColor = vec4( mix(firstColor.rgb, secondColor.rgb, luminance), textureColor.a); | ||
| } | ||
| ); | ||
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| @implementation GPUImageFalseColorFilter | ||
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| @synthesize secondColor = _secondColor; | ||
| @synthesize firstColor = _firstColor; | ||
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| - (id)init; | ||
| { | ||
| if (!(self = [super initWithFragmentShaderFromString:kGPUFalseColorFragmentShaderString])) | ||
| { | ||
| return nil; | ||
| } | ||
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| firstColorUniform = [filterProgram uniformIndex:@"firstColor"]; | ||
| secondColorUniform = [filterProgram uniformIndex:@"secondColor"]; | ||
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| self.firstColor = (GPUVector4){0.0f, 0.0f, 0.5f, 1.0f}; | ||
| self.secondColor = (GPUVector4){1.0f, 0.0f, 0.0f, 1.0f}; | ||
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| return self; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Accessors | ||
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| - (void)setFirstColor:(GPUVector4)newValue; | ||
| { | ||
| _firstColor = newValue; | ||
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| [self setFirstColorRed:_firstColor.one green:_firstColor.two blue:_firstColor.three]; | ||
| } | ||
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| - (void)setSecondColor:(GPUVector4)newValue; | ||
| { | ||
| _secondColor = newValue; | ||
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| [self setSecondColorRed:_secondColor.one green:_secondColor.two blue:_secondColor.three]; | ||
| } | ||
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| - (void)setFirstColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent; | ||
| { | ||
| GLfloat filterColor[3]; | ||
| filterColor[0] = redComponent; | ||
| filterColor[1] = greenComponent; | ||
| filterColor[2] = blueComponent; | ||
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| [GPUImageOpenGLESContext useImageProcessingContext]; | ||
| [filterProgram use]; | ||
| glUniform3fv(firstColorUniform, 1, filterColor); | ||
| } | ||
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| - (void)setSecondColorRed:(GLfloat)redComponent green:(GLfloat)greenComponent blue:(GLfloat)blueComponent; | ||
| { | ||
| GLfloat filterColor[3]; | ||
| filterColor[0] = redComponent; | ||
| filterColor[1] = greenComponent; | ||
| filterColor[2] = blueComponent; | ||
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| [GPUImageOpenGLESContext useImageProcessingContext]; | ||
| [filterProgram use]; | ||
| glUniform3fv(secondColorUniform, 1, filterColor); | ||
| } | ||
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| @end |
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