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第11章 常用3D开发技巧案例/Sample11_10/assets/frag.sh

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+precision mediump float;
+//接收从顶点着色器过来的参数
+varying vec4 diffuse;
+varying vec4 specular;
+varying float vEdge;
+void main()                         
+{
+   float averageDiffuse = (diffuse.x + diffuse.y + diffuse.z)/3.0;
+   if(averageDiffuse<0.5){
+      averageDiffuse=0.2;
+   } else {
+      averageDiffuse=0.8;
+   }
+   vec4 diffuseFinal = vec4(averageDiffuse, averageDiffuse, averageDiffuse, 1.0);
+   
+   float averageSpecular = (specular.x + specular.y + specular.z)/3.0;
+   if(averageSpecular<0.18){
+      averageSpecular=0.0;
+   } else {
+      averageSpecular=1.0;
+   }
+   vec4 specularFinal = vec4(averageSpecular, averageSpecular, averageSpecular, 1.0);
+   
+   float edgeFinal = 1.0;
+   if(vEdge<0.2){//如果为边缘像素，用黑色描边
+       edgeFinal = 0.0;
+   }
+   gl_FragColor = edgeFinal*(specularFinal+diffuseFinal);//给此片元颜色值
+}