GLGETEXGEN(3G)                                                GLGETEXGEN(3G)



NAME
       glGetTexGendv,, glGetTexGenfv,, glGetTexGeniv - return texture coordinate
       generation parameters


C SPECIFICATION
       void glGetTexGendv( GLenum coord,
                           GLenum pname,
                           GLdouble *params )
       void glGetTexGenfv( GLenum coord,
                           GLenum pname,
                           GLfloat *params )
       void glGetTexGeniv( GLenum coord,
                           GLenum pname,
                           GLint *params )


PARAMETERS
       coord   Specifies a texture coordinate.  Must be GLS, GLT,  GLR,  or
               GLQ.

       pname   Specifies  the  symbolic  name  of the value(s) to be returned.
               Must be either GLTEXTUREGENMODE or the name of  one  of  the
               texture   generation   plane   equations:   GLOBJECTPLANE  or
               GLEYEPLANE.

       params  Returns the requested data.

DESCRIPTION
       glGetTexGen returns in params selected parameters of a texture  coordi-
       nate  generation  function  that  was  specified using glTexGen.  coord
       names one of the (s, t, r, q) texture coordinates, using  the  symbolic
       constant GLS, GLT, GLR, or GLQ.

       pname specifies one of three symbolic names:

       GLTEXTUREGENMODE         params  returns  the  single-valued texture
                                   generation function, a  symbolic  constant.
                                   The initial value is GLEYELINEAR.

       GLOBJECTPLANE             params  returns  the  four  plane  equation
                                   coefficients that  specify  object  linear-
                                   coordinate   generation.   Integer  values,
                                   when requested, are  mapped  directly  from
                                   the internal floating-point representation.

       GLEYEPLANE                params  returns  the  four  plane  equation
                                   coefficients  that specify eye linear-coor-
                                   dinate generation.   Integer  values,  when
                                   requested,  are  mapped  directly  from the
                                   internal   floating-point   representation.
                                   The returned values are those maintained in
                                   eye coordinates.  They are not equal to the
                                   values specified using glTexGen, unless the
                                   modelview matrix was identity when glTexGen
                                   was called.

NOTES
       If  an error is generated, no change is made to the contents of params.

       When  the  GLARBmultitexture  extension  is  supported,   glGetTexGen
       returns  the  texture  coordinate  generation parameters for the active
       texture unit.

ERORS
       GLINVALIDENUM is generated if coord  or  pname  is  not  an  accepted
       value.

       GLINVALIDOPERATION  is  generated  if glGetTexGen is executed between
       the execution of glBegin and the corresponding execution of glEnd.

SEE ALSO
       glActiveTextureARB, glTexGen



                                                               GLGETEXGEN(3G)