IOS – OpenGL ES 图像水晶球效果 GPUImageGlassSphereFilter

IOS – OpenGL ES 图像水晶球效果 GPUImageGlassSphereFilter

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES 基础

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES 转场

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES 特效

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES 函数

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES GPUImage 使用

零基础 OpenGL (ES) 学习路线推荐 : OpenGL (ES) 学习目录 >> OpenGL ES GLSL 编程


一.简介

GPUImage 共 125 个滤镜, 分为四类

1、Color adjustments : 31 filters , 颜色处理相关
2、Image processing : 40 filters , 图像处理相关.
3、Blending modes : 29 filters , 混合模式相关.
4、Visual effects : 25 filters , 视觉效果相关.

GPUImageGlassSphereFilter 属于 GPUImage 图像视觉效果相关,用来处理图像水晶球效果。shader 源码如下:

/******************************************************************************************/
//@Author:猿说编程
//@Blog(个人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES 图像水晶球效果 GPUImageGlassSphereFilter
//@Time:2022/06/03 06:30
//@Motto:不积跬步无以至千里,不积小流无以成江海,程序人生的精彩需要坚持不懈地积累!
/******************************************************************************************/

#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImageGlassSphereFragmentShaderString = SHADER_STRING
(
 varying highp vec2 textureCoordinate;
 
 uniform sampler2D inputImageTexture;
 
 uniform highp vec2 center;
 uniform highp float radius;
 uniform highp float aspectRatio;
 uniform highp float refractiveIndex;
// uniform vec3 lightPosition;
 const highp vec3 lightPosition = vec3(-0.5, 0.5, 1.0);
 const highp vec3 ambientLightPosition = vec3(0.0, 0.0, 1.0);
 
 void main()
 {
     highp vec2 textureCoordinateToUse = vec2(textureCoordinate.x, (textureCoordinate.y * aspectRatio + 0.5 - 0.5 * aspectRatio));
     highp float distanceFromCenter = distance(center, textureCoordinateToUse);
     lowp float checkForPresenceWithinSphere = step(distanceFromCenter, radius);
     
     distanceFromCenter = distanceFromCenter / radius;
     
     highp float normalizedDepth = radius * sqrt(1.0 - distanceFromCenter * distanceFromCenter);
     highp vec3 sphereNormal = normalize(vec3(textureCoordinateToUse - center, normalizedDepth));
     
     highp vec3 refractedVector = 2.0 * refract(vec3(0.0, 0.0, -1.0), sphereNormal, refractiveIndex);
     refractedVector.xy = -refractedVector.xy;
     
     highp vec3 finalSphereColor = texture2D(inputImageTexture, (refractedVector.xy + 1.0) * 0.5).rgb;
     
     // Grazing angle lighting
     highp float lightingIntensity = 2.5 * (1.0 - pow(clamp(dot(ambientLightPosition, sphereNormal), 0.0, 1.0), 0.25));
     finalSphereColor += lightingIntensity;
     
     // Specular lighting
     lightingIntensity  = clamp(dot(normalize(lightPosition), sphereNormal), 0.0, 1.0);
     lightingIntensity  = pow(lightingIntensity, 15.0);
     finalSphereColor += vec3(0.8, 0.8, 0.8) * lightingIntensity;
     
     gl_FragColor = vec4(finalSphereColor, 1.0) * checkForPresenceWithinSphere;
 }
);
#else
NSString *const kGPUImageGlassSphereFragmentShaderString = SHADER_STRING
(
 varying vec2 textureCoordinate;
 
 uniform sampler2D inputImageTexture;
 
 uniform vec2 center;
 uniform float radius;
 uniform float aspectRatio;
 uniform float refractiveIndex;
 // uniform vec3 lightPosition;
 const vec3 lightPosition = vec3(-0.5, 0.5, 1.0);
 const vec3 ambientLightPosition = vec3(0.0, 0.0, 1.0);
 
 void main()
 {
     vec2 textureCoordinateToUse = vec2(textureCoordinate.x, (textureCoordinate.y * aspectRatio + 0.5 - 0.5 * aspectRatio));
     float distanceFromCenter = distance(center, textureCoordinateToUse);
     float checkForPresenceWithinSphere = step(distanceFromCenter, radius);
     
     distanceFromCenter = distanceFromCenter / radius;
     
     float normalizedDepth = radius * sqrt(1.0 - distanceFromCenter * distanceFromCenter);
     vec3 sphereNormal = normalize(vec3(textureCoordinateToUse - center, normalizedDepth));
     
     vec3 refractedVector = 2.0 * refract(vec3(0.0, 0.0, -1.0), sphereNormal, refractiveIndex);
     refractedVector.xy = -refractedVector.xy;
     
     vec3 finalSphereColor = texture2D(inputImageTexture, (refractedVector.xy + 1.0) * 0.5).rgb;
     
     // Grazing angle lighting
     float lightingIntensity = 2.5 * (1.0 - pow(clamp(dot(ambientLightPosition, sphereNormal), 0.0, 1.0), 0.25));
     finalSphereColor += lightingIntensity;
     
     // Specular lighting
     lightingIntensity  = clamp(dot(normalize(lightPosition), sphereNormal), 0.0, 1.0);
     lightingIntensity  = pow(lightingIntensity, 15.0);
     finalSphereColor += vec3(0.8, 0.8, 0.8) * lightingIntensity;
     
     gl_FragColor = vec4(finalSphereColor, 1.0) * checkForPresenceWithinSphere;
 }
);
#endif

二.效果演示

使用 GPUImageGlassSphereFilter 完成图像哈哈镜效果,原图:

使用 GPUImageGlassSphereFilter 完成图像哈哈镜效果


三.源码下载

OpenGL ES Demo 下载地址 : IOS – OpenGL ES 图像水晶球效果 GPUImageGlassSphereFilter


四.猜你喜欢

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  3. IOS – OpenGL ES 调节图像对比度 GPUImageContrastFilter
  4. IOS – OPenGL ES 调节图像饱和度 GPUImageSaturationFilter
  5. IOS – OPenGL ES 调节图像伽马线 GPUImageGammaFilter
  6. IOS – OpenGL ES 调节图像反色 GPUImageColorInvertFilter
  7. IOS – OpenGL ES 调节图像褐色 GPUImageSepiaFilter
  8. IOS – OpenGL ES 调节图像灰色 GPUImageGrayscaleFilter
  9. IOS – OpenGL ES 调节图像RGB通道 GPUImageRGBFilter
  10. IOS – OpenGL ES 调节图像不透明度 GPUImageOpacityFilter
  11. IOS – OpenGL ES 调节图像阴影 GPUImageHighlightShadowFilter
  12. IOS – OpenGL ES 调节图像色彩替换 GPUImageFalseColorFilter
  13. GPUImage – 色彩直方图 GPUImageHistogramFilter
  14. GPUImage – 色彩直方图 GPUImageHistogramGenerator
  15. GPUImage – 像素平均色值 GPUImageAverageColor
  16. GPUImage – 亮度平均 GPUImageLuminosity
  17. IOS – OpenGL ES 调节图像色度 GPUImageHueFilter
  18. IOS – OpenGL ES 指定颜色抠图 GPUImageChromaKeyFilter
  19. IOS – OpenGL ES 调节图像白平衡/色温 GPUImageWhiteBalanceFilter
  20. IOS – OpenGL ES 设置图像 lookup 滤镜 GPUImageLookupFilter
  21. IOS – OpenGL ES 设置图像滤镜 GPUImageAmatorkaFilter
  22. IOS – OpenGL ES 设置图像滤镜 GPUImageSoftEleganceFilter
  23. IOS – OpenGL ES 设置图像锐化 GPUImageSharpenFilter
  24. IOS – OpenGL ES 绘制十字 GPUImageCrosshairGenerator
  25. IOS – OpenGL ES 绘制线条 GPUImageLineGenerator
  26. IOS – OpenGL ES 设置图像黑白燥点 GPUImageLocalBinaryPatternFilter
  27. IOS – OpenGL ES 设置图像卡通效果(黑色粗线描边) GPUImageToonFilter
  28. IOS – OpenGL ES 桑原滤波/水粉画模糊效果 GPUImageKuwaharaFilter
  29. IOS – OpenGL ES 黑白马赛克效果 GPUImageMosaicFilter
  30. IOS – OpenGL ES 像素化马赛克效果 GPUImagePixellateFilter
  31. IOS – OpenGL ES 同心圆像素化马赛克效果 GPUImagePolarPixel
  32. IOS – OpenGL ES 黑白网状效果 GPUImageCrosshatchFilter
  33. IOS – OpenGL ES 色彩丢失/模糊效果 GPUImageColorPackingFilter
  34. IOS – OpenGL ES 图像晕影 GPUImageVignetteFilter
  35. IOS – OpenGL ES 图像漩涡 GPUImageSwirlFilter
  36. IOS – OpenGL ES 图像鱼眼扩散效果 GPUImageBulgeDistortionFilter
  37. IOS – OpenGL ES 图像鱼眼移动效果 GPUImageBulgeDistortionFilter
  38. IOS – OpenGL ES 图像凹面镜移动效果 GPUImagePinchDistortionFilter
  39. IOS – OpenGL ES 图像凹面镜放大效果 GPUImagePinchDistortionFilter
  40. IOS – OpenGL ES 图像哈哈镜效果 GPUImageStretchDistortionFilter
  41. IOS – OpenGL ES 图像水晶球效果 GPUImageGlassSphereFilter

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