#import "GPUImageVignetteFilter.h"
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#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
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NSString *const kGPUImageVignetteFragmentShaderString = SHADER_STRING
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(
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uniform sampler2D inputImageTexture;
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varying highp vec2 textureCoordinate;
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uniform lowp vec2 vignetteCenter;
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uniform lowp vec3 vignetteColor;
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uniform highp float vignetteStart;
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uniform highp float vignetteEnd;
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void main()
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{
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lowp vec4 sourceImageColor = texture2D(inputImageTexture, textureCoordinate);
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lowp float d = distance(textureCoordinate, vec2(vignetteCenter.x, vignetteCenter.y));
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lowp float percent = smoothstep(vignetteStart, vignetteEnd, d);
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gl_FragColor = vec4(mix(sourceImageColor.rgb, vignetteColor, percent), sourceImageColor.a);
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}
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);
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#else
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NSString *const kGPUImageVignetteFragmentShaderString = SHADER_STRING
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(
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uniform sampler2D inputImageTexture;
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varying vec2 textureCoordinate;
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uniform vec2 vignetteCenter;
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uniform vec3 vignetteColor;
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uniform float vignetteStart;
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uniform float vignetteEnd;
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void main()
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{
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vec4 sourceImageColor = texture2D(inputImageTexture, textureCoordinate);
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float d = distance(textureCoordinate, vec2(vignetteCenter.x, vignetteCenter.y));
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float percent = smoothstep(vignetteStart, vignetteEnd, d);
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gl_FragColor = vec4(mix(sourceImageColor.rgb, vignetteColor, percent), sourceImageColor.a);
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}
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);
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#endif
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@implementation GPUImageVignetteFilter
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@synthesize vignetteCenter = _vignetteCenter;
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@synthesize vignetteColor = _vignetteColor;
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@synthesize vignetteStart =_vignetteStart;
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@synthesize vignetteEnd = _vignetteEnd;
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#pragma mark -
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#pragma mark Initialization and teardown
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- (id)init;
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{
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if (!(self = [super initWithFragmentShaderFromString:kGPUImageVignetteFragmentShaderString]))
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{
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return nil;
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}
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vignetteCenterUniform = [filterProgram uniformIndex:@"vignetteCenter"];
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vignetteColorUniform = [filterProgram uniformIndex:@"vignetteColor"];
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vignetteStartUniform = [filterProgram uniformIndex:@"vignetteStart"];
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vignetteEndUniform = [filterProgram uniformIndex:@"vignetteEnd"];
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self.vignetteCenter = (CGPoint){ 0.5f, 0.5f };
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self.vignetteColor = (GPUVector3){ 0.0f, 0.0f, 0.0f };
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self.vignetteStart = 0.3;
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self.vignetteEnd = 0.75;
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return self;
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}
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#pragma mark -
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#pragma mark Accessors
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- (void)setVignetteCenter:(CGPoint)newValue
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{
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_vignetteCenter = newValue;
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[self setPoint:newValue forUniform:vignetteCenterUniform program:filterProgram];
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}
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- (void)setVignetteColor:(GPUVector3)newValue
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{
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_vignetteColor = newValue;
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[self setVec3:newValue forUniform:vignetteColorUniform program:filterProgram];
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}
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- (void)setVignetteStart:(CGFloat)newValue;
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{
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_vignetteStart = newValue;
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[self setFloat:_vignetteStart forUniform:vignetteStartUniform program:filterProgram];
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}
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- (void)setVignetteEnd:(CGFloat)newValue;
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{
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_vignetteEnd = newValue;
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[self setFloat:_vignetteEnd forUniform:vignetteEndUniform program:filterProgram];
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}
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@end
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