opengles图像处理之浮雕效果

来源：互联网发布：rgb和hsl转换算法实现编辑：程序博客网时间：2024/04/28 03:58

实现原理见 http://blog.csdn.NET/hb707934728/article/details/53100334

实现浮雕效果的卷积内核

20200030-6

核心代码片元shader实现

precision mediump float;//给出默认的浮点精度varying vec2 vTextureCoord;//从顶点着色器传递过来的纹理坐标uniform sampler2D sTexture;//纹理内容数据void main() {           //给出卷积内核中各个元素对应像素相对于待处理像素的纹理坐标偏移量vec2 offset0=vec2(-1.0,-1.0); vec2 offset1=vec2(0.0,-1.0); vec2 offset2=vec2(1.0,-1.0);vec2 offset3=vec2(-1.0,0.0); vec2 offset4=vec2(0.0,0.0); vec2 offset5=vec2(1.0,0.0);vec2 offset6=vec2(-1.0,1.0); vec2 offset7=vec2(0.0,1.0); vec2 offset8=vec2(1.0,1.0); const float scaleFactor = 1.0;//给出最终求和时的加权因子(为调整亮度)//卷积内核中各个位置的值float kernelValue0 = 2.0; float kernelValue1 = 0.0; float kernelValue2 = 2.0;float kernelValue3 = 0.0; float kernelValue4 = 0.0; float kernelValue5 = 0.0;float kernelValue6 = 3.0; float kernelValue7 = 0.0; float kernelValue8 = -6.0;vec4 sum;//最终的颜色和//获取卷积内核中各个元素对应像素的颜色值vec4 cTemp0,cTemp1,cTemp2,cTemp3,cTemp4,cTemp5,cTemp6,cTemp7,cTemp8;cTemp0=texture2D(sTexture, vTextureCoord.st + offset0.xy/512.0);cTemp1=texture2D(sTexture, vTextureCoord.st + offset1.xy/512.0);cTemp2=texture2D(sTexture, vTextureCoord.st + offset2.xy/512.0);cTemp3=texture2D(sTexture, vTextureCoord.st + offset3.xy/512.0);cTemp4=texture2D(sTexture, vTextureCoord.st + offset4.xy/512.0);cTemp5=texture2D(sTexture, vTextureCoord.st + offset5.xy/512.0);cTemp6=texture2D(sTexture, vTextureCoord.st + offset6.xy/512.0);cTemp7=texture2D(sTexture, vTextureCoord.st + offset7.xy/512.0);cTemp8=texture2D(sTexture, vTextureCoord.st + offset8.xy/512.0);//颜色求和sum =kernelValue0*cTemp0+kernelValue1*cTemp1+kernelValue2*cTemp2+ kernelValue3*cTemp3+kernelValue4*cTemp4+kernelValue5*cTemp5+     kernelValue6*cTemp6+kernelValue7*cTemp7+kernelValue8*cTemp8; //灰度化float hd=(sum.r+sum.g+sum.b)/3.0;  gl_FragColor = vec4(hd) * scaleFactor; //进行亮度加权后将最终颜色传递给管线}

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