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GPUImageBlueValentineFilter.m

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+#import "GPUImageBlueValentineFilter.h"
+
+@implementation GPUImageBlueValentineFilter
+
+- (id)init;
+{
+ if (!(self = [super init]))
+ {
+ return nil;
+ }
+
+ // Blue Valentine
+ GPUImageSaturationFilter *saturFilter = [[GPUImageSaturationFilter alloc] init];
+ [saturFilter setSaturation:0.5];
+ [self addFilter:saturFilter];
+
+ GPUImageMonochromeFilter *monoFilter = [[GPUImageMonochromeFilter alloc] init];
+ [monoFilter setColor:(GPUVector4){1.0f, 1.0f, 2.0f, 1.0f}];
+ [monoFilter setIntensity:0.15];
+ [self addFilter:monoFilter];
+
+ GPUImagePixellateFilter *vigFilter = [[GPUImagePixellateFilter alloc] init];
+ vigFilter.fractionalWidthOfAPixel = 0.02;
+ [self addFilter:vigFilter];
+
+ GPUImageExposureFilter *expoFilter = [[GPUImageExposureFilter alloc] init];
+ [expoFilter setExposure:0.3];
+ [self addFilter:expoFilter];
+
+ [saturFilter addTarget:monoFilter];
+ [monoFilter addTarget:vigFilter];
+ [vigFilter addTarget:expoFilter];
+
+ [self setInitialFilters:[NSArray arrayWithObject:saturFilter]];
+ [self setTerminalFilter:expoFilter];
+
+ return self;
+}
+
+@end

GPUImageFilterTest.m

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+//
+// GPUImageFilterTest.m
+// moment
+//
+// Created by Nuno Gonçalves on 21/08/16.
+// Copyright © 2016 Motionblink. All rights reserved.
+//
+
+#import "GPUImageFilterTest.h"
+
+/*NSString *const kGPUImageTestFragmentShaderString = SHADER_STRING
+(
+ precision mediump float;
+ uniform sampler2D inputImageTexture;
+ varying vec2 textureCoordinate;
+ const float PI = 3.1415926535;
+ uniform float BarrelPower;
+ 
+ vec2 Distort(vec2 p)
+ {
+ float theta = atan(p.y, p.x);
+ float radius = length(p);
+ radius = pow(radius, BarrelPower);
+ p.x = radius * cos(theta);
+ p.y = radius * sin(theta);
+ return 0.5 * (p + 1.0);
+ }
+ 
+ void main()
+ {
+ vec2 uv;
+ float d = length(2.0 * textureCoordinate.xy - 1.0);
+ if (d < 1.0)
+ {
+ uv = Distort(2.0 * textureCoordinate.xy - 1.0);
+ }
+ else
+ {
+ uv = textureCoordinate.xy;
+ }
+ vec4 c = texture2D(inputImageTexture, uv);
+ gl_FragColor = c;
+ }
+ );*/
+
+
+NSString *const kGPUImageTestVertexShaderString = SHADER_STRING
+(
+ precision mediump float;
+ varying vec4 Vertex_UV;
+ varying vec2 textureCoordinate;
+ attribute vec4 gxl3d_ModelViewProjectionMatrix;
+ void main()
+{
+ //gl_Position = gxl3d_ModelViewProjectionMatrix;
+ //Vertex_UV = textureCoordinate;
+});
+
+NSString *const kGPUImageTestFragmentShaderString = SHADER_STRING
+(
+ precision mediump float;
+ uniform sampler2D inputImageTexture;
+ varying vec2 textureCoordinate;
+ varying vec4 Vertex_UV;
+ const float PI = 3.1415926535;
+
+ void main()
+{
+ float aperture = 178.0;
+ float apertureHalf = 0.5 * aperture * (PI / 180.0);
+ float maxFactor = sin(apertureHalf);
+
+ vec2 uv;
+ vec2 xy = 2.0 * textureCoordinate.xy - 1.0;
+ float d = length(xy);
+ if (d < (2.0-maxFactor))
+ {
+ d = length(xy * maxFactor);
+ float z = sqrt(1.0 - d * d);
+ float r = atan(d, z) / PI;
+ float phi = atan(xy.y, xy.x);
+
+ uv.x = r * cos(phi) + 0.5;
+ uv.y = r * sin(phi) + 0.5;
+ }
+ else
+ {
+ uv = textureCoordinate.xy;
+ }
+ vec4 c = texture2D(inputImageTexture, uv);
+ gl_FragColor = c;
+}
+);
+
+@implementation GPUImageFilterTest
+
+- (id)init;
+{
+ //http:https://pixelshaders.com/editor/
+ //http:https://www.geeks3d.com/20140213/glsl-shader-library-fish-eye-and-dome-and-barrel-distortion-post-processing-filters/
+ /* if (!(self = [super initWithFragmentShaderFromString:kGPUImageTestFragmentShaderString sources:@[ [[GPUImagePicture alloc] initWithImage:[UIImage imageNamed:@"lagoapatas.jpg"]]]]))
+ {
+ return nil;
+ }*/
+
+ if (!(self = [self initWithFragmentShaderFromString:kGPUImageTestFragmentShaderString]))
+ {
+ return nil;
+ }
+
+ return self;
+}
+
+
+@end