先以opengl线框模式绘制两个（或者多个）相邻的不同颜色的三角形；然后再以其他颜色依照opengl填充模式绘制完全相同的三角形，将两次绘制结果进行混合(Blending)。-The first drawing in opengl wireframe mode two (or more) adjacent triangles of different colors identical triangles to other colors, and then drawing in opengl f