OpenGL ES 3.0 点，线，三角形绘制形式总结

    public static final String vertex3 =
            "#version 300 es \n" +
            "uniform mat4 uMVPMatrix;\n"  
            + "layout(location = 0) in vec3 aPosition;\n"  
            + "layout(location = 1) in vec2 aTexCoor;\n"  
            + "out vec2 vTextureCoord;\n"   
            + "void main() { \n"  
            + "gl_Position  = uMVPMatrix * vec4(aPosition,1);\n" 
            + "gl_PointSize = 20.0;\n"
            + "vTextureCoord = aTexCoor;\n"   
            + "}\n"  

   public static final String fragment4 = "#version 300 es \n" + 
               "precision mediump float;\n"  
          + "in vec2 vTextureCoord;\n"  
          + "out vec4 v_color;\n"
          + "void main() { \n"  
          + "vec2 coord =  vTextureCoord;\n"  
          + "v_color = vec4(1.0,1.0,1.0,0.0); \n"  
          + "}\n"  
          ;