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第14章 片元着色器的妙用/Sample14_2/assets/frag.sh

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+precision mediump float;
+varying vec4 vAmbient;//接收从顶点着色器过来的环境光分量
+varying vec4 vDiffuse;//接收从顶点着色器过来的散射光分量
+varying vec4 vSpecular;//接收从顶点着色器过来的镜面反射光分量
+varying vec2 mcLongLat;//接收从顶点着色器过来的参数
+void main() {
+   vec3 color;
+   if(abs(mcLongLat.y)>75.0){
+   	  color = vec3(1.0,1.0,1.0);//两边是白色
+   }else{
+      int colorNum = int(mcLongLat.x/45.0);//颜色号
+      if(colorNum == 0){
+      	color = vec3(1.0,0.0,0.0);//0号颜色
+      }else if(colorNum == 1){
+      	color = vec3(0.0,1.0,0.0);//1号颜色
+      }else if(colorNum == 2){
+      	color = vec3(0.0,0.0,1.0);//2号颜色
+      }else if(colorNum == 3){
+      	color = vec3(1.0,1.0,0.0);//3号颜色
+      }else if(colorNum == 4){
+      	color = vec3(1.0,0.0,1.0);//4号颜色
+      }else if(colorNum == 5){
+      	color = vec3(0.0,1.0,1.0);//5号颜色
+      }else if(colorNum == 6){
+      	color = vec3(0.3,0.4,0.7);//6号颜色
+      }else if(colorNum == 7){
+      	color = vec3(0.3,0.7,0.2);//7号颜色   
+      }
+   }
+   vec4 finalColor = vec4(color,1.0);//将计算出的颜色给此片元
+   //给此片元颜色值
+   gl_FragColor=finalColor*vAmbient + finalColor*vDiffuse + finalColor*vSpecular;
+}