【glTexGen】

　　Rather than having to explicitly provide a texture coordinate for each vertex, we can use texture coordinate generation (texgen) functions to have OpenGL automatically compute texture coordinates.

　　This uses the function glTexGen, and the glEnable modes GL_TEXTURE_GEN_S & GL_TEXTURE_GEN_T.

planeCoefficients = [ 1, 0, 0, 0 ]glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR)glTexGenfv(GL_S, GL_OBJECT_PLANE, planeCoefficients)glEnable(GL_TEXTURE_GEN_S)glBegin(GL_QUADS)glVertex3f(-3.25, -1, 0)glVertex3f(-1.25, -1, 0)glVertex3f(-1.25, 1, 0)glVertex3f(-3.25, 1, 0)glEnd()

参考：http://resumbrae.com/ub/dms424_s05/10/print.html