OpenGL ES 3.0 点，线，三角形绘制形式总结

OpenGL ES 3.0

顶点

    -1,  1, 0,
-0.5f,  0, 0,
     0, -1, 0,
    -1,  0, 0,
 0.5f,   0, 0,
     1, -1,  0

顶点设置成了大小20

    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"
          ;  

GLES30.glDrawArrays 绘制形状

GL_POINTS  画点

GL_LINES    画线，2点连线

GL_LINE_LOOP  让线循环闭合

GL_LINE_STRIP 绘制线并不闭合

GL_TRIANGLES 绘制三角形，三个点绘制一个

GL_TRIANGLE_STRIP  每个顶点和其它2个顶点连接形成三角形

GL_TRIANGLE_FAN  绘制三角形扇，可以绘制圆之类的形状