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第21章 火力篮球/BasketBall_Shot/assets/frag_yingzi.sh

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+precision mediump float;
+uniform int uisShadowFrag;//是否绘制阴影
+uniform int uisLanbanFrag;//是否绘制球在篮板上的阴影
+uniform sampler2D usTextureBall;//桌球纹理内容数据
+varying vec2 vTextureCoord; //接收从顶点着色器过来的参数
+varying vec4 vambient;
+varying vec4 vdiffuse;
+varying vec4 vspecular;
+varying vec4 vfragLosition;
+void main()                         
+{    
+   //将计算出的颜色给此片元
+   vec4 finalColor;
+   if(uisShadowFrag==1)
+   {//绘制阴影，纹理从桌面纹理采样
+    finalColor=vec4(0.3,0.3,0.3,0.2);
+   	if(uisLanbanFrag==1)
+   	{
+      if(vfragLosition.x<-9.6||vfragLosition.x>9.6||vfragLosition.y<4.24||vfragLosition.y>10.5)
+      {
+        finalColor=vec4(0.3,0.3,0.3,0.0);
+      }
+    }
+     
+     gl_FragColor = finalColor;//给此片元颜色值
+   }
+   else
+   {//绘制球本身，纹理从球纹理采样
+     finalColor=texture2D(usTextureBall, vTextureCoord);
+     gl_FragColor = finalColor*vambient+finalColor*vspecular+finalColor*vdiffuse;//给此片元颜色值
+   }
+}