IOS – OpenGL ES 圖像浮雕3d效果 GPUImageEmbossFilter

目錄一.簡介二.效果演示三.源碼下載四.猜你喜歡零基礎 OpenGL (ES) 學習路線推薦 : OpenGL (ES) 學習目錄 >> OpenGL ES 基礎零基礎 OpenGL (ES) 學習路線推薦 : OpenGL (ES) 學習目錄 >> OpenGL ES 轉場零基礎 O ...

一.簡介
二.效果演示
三.源碼下載
四.猜你喜歡

零基礎 OpenGL (ES) 學習路線推薦 : OpenGL (ES) 學習目錄 >> OpenGL ES 基礎

零基礎 OpenGL (ES) 學習路線推薦 : OpenGL (ES) 學習目錄 >> OpenGL ES 轉場

零基礎 OpenGL (ES) 學習路線推薦 : OpenGL (ES) 學習目錄 >> OpenGL ES 特效

零基礎 OpenGL (ES) 學習路線推薦 : OpenGL (ES) 學習目錄 >> OpenGL ES 函數

零基礎 OpenGL (ES) 學習路線推薦 : OpenGL (ES) 學習目錄 >> OpenGL ES GPUImage 使用

零基礎 OpenGL (ES) 學習路線推薦 : OpenGL (ES) 學習目錄 >> OpenGL ES GLSL 編程

一.簡介

GPUImage 共 125 個濾鏡, 分為四類

1、Color adjustments : 31 filters , 顏色處理相關
2、Image processing : 40 filters , 圖像處理相關.
3、Blending modes : 29 filters , 混合模式相關.
4、Visual effects : 25 filters , 視覺效果相關.

GPUImageEmbossFilter 屬於 GPUImage 圖像視覺效果相關，用來處理圖像浮雕 3d 效果。shader 源碼如下：

/******************************************************************************************/
//@Author:猿說編程
//@Blog(個人博客地址): www.codersrc.com
//@File:IOS – OpenGL ES 圖像浮雕3d效果 GPUImageEmbossFilter
//@Time:2022/06/10 06:30
//@Motto:不積跬步無以至千里，不積小流無以成江海，程式人生的精彩需要堅持不懈地積累！
/******************************************************************************************/

#if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE
NSString *const kGPUImage3x3ConvolutionFragmentShaderString = SHADER_STRING
(
 precision highp float;

 uniform sampler2D inputImageTexture;

 uniform mediump mat3 convolutionMatrix;

 varying vec2 textureCoordinate;
 varying vec2 leftTextureCoordinate;
 varying vec2 rightTextureCoordinate;

 varying vec2 topTextureCoordinate;
 varying vec2 topLeftTextureCoordinate;
 varying vec2 topRightTextureCoordinate;

 varying vec2 bottomTextureCoordinate;
 varying vec2 bottomLeftTextureCoordinate;
 varying vec2 bottomRightTextureCoordinate;

 void main()
 {
     mediump vec3 bottomColor = texture2D(inputImageTexture, bottomTextureCoordinate).rgb;
     mediump vec3 bottomLeftColor = texture2D(inputImageTexture, bottomLeftTextureCoordinate).rgb;
     mediump vec3 bottomRightColor = texture2D(inputImageTexture, bottomRightTextureCoordinate).rgb;
     mediump vec4 centerColor = texture2D(inputImageTexture, textureCoordinate);
     mediump vec3 leftColor = texture2D(inputImageTexture, leftTextureCoordinate).rgb;
     mediump vec3 rightColor = texture2D(inputImageTexture, rightTextureCoordinate).rgb;
     mediump vec3 topColor = texture2D(inputImageTexture, topTextureCoordinate).rgb;
     mediump vec3 topRightColor = texture2D(inputImageTexture, topRightTextureCoordinate).rgb;
     mediump vec3 topLeftColor = texture2D(inputImageTexture, topLeftTextureCoordinate).rgb;

     mediump vec3 resultColor = topLeftColor * convolutionMatrix[0][0] + topColor * convolutionMatrix[0][1] + topRightColor * convolutionMatrix[0][2];
     resultColor += leftColor * convolutionMatrix[1][0] + centerColor.rgb * convolutionMatrix[1][1] + rightColor * convolutionMatrix[1][2];
     resultColor += bottomLeftColor * convolutionMatrix[2][0] + bottomColor * convolutionMatrix[2][1] + bottomRightColor * convolutionMatrix[2][2];

     gl_FragColor = vec4(resultColor, centerColor.a);
 }
);
#else
NSString *const kGPUImage3x3ConvolutionFragmentShaderString = SHADER_STRING
(
 uniform sampler2D inputImageTexture;

 uniform mat3 convolutionMatrix;

 varying vec2 textureCoordinate;
 varying vec2 leftTextureCoordinate;
 varying vec2 rightTextureCoordinate;

 varying vec2 topTextureCoordinate;
 varying vec2 topLeftTextureCoordinate;
 varying vec2 topRightTextureCoordinate;

 varying vec2 bottomTextureCoordinate;
 varying vec2 bottomLeftTextureCoordinate;
 varying vec2 bottomRightTextureCoordinate;

 void main()
 {
     vec3 bottomColor = texture2D(inputImageTexture, bottomTextureCoordinate).rgb;
     vec3 bottomLeftColor = texture2D(inputImageTexture, bottomLeftTextureCoordinate).rgb;
     vec3 bottomRightColor = texture2D(inputImageTexture, bottomRightTextureCoordinate).rgb;
     vec4 centerColor = texture2D(inputImageTexture, textureCoordinate);
     vec3 leftColor = texture2D(inputImageTexture, leftTextureCoordinate).rgb;
     vec3 rightColor = texture2D(inputImageTexture, rightTextureCoordinate).rgb;
     vec3 topColor = texture2D(inputImageTexture, topTextureCoordinate).rgb;
     vec3 topRightColor = texture2D(inputImageTexture, topRightTextureCoordinate).rgb;
     vec3 topLeftColor = texture2D(inputImageTexture, topLeftTextureCoordinate).rgb;

     vec3 resultColor = topLeftColor * convolutionMatrix[0][0] + topColor * convolutionMatrix[0][1] + topRightColor * convolutionMatrix[0][2];
     resultColor += leftColor * convolutionMatrix[1][0] + centerColor.rgb * convolutionMatrix[1][1] + rightColor * convolutionMatrix[1][2];
     resultColor += bottomLeftColor * convolutionMatrix[2][0] + bottomColor * convolutionMatrix[2][1] + bottomRightColor * convolutionMatrix[2][2];

     gl_FragColor = vec4(resultColor, centerColor.a);
 }
);
#endif