glGetTexGen

GLGETTEXGEN(3G)						      GLGETTEXGEN(3G)



NAME
       glGetTexGendv,  glGetTexGenfv,  glGetTexGeniv - return texture coordi-
       nate 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 GL_S, GL_T, GL_R,  or
	       GL_Q.

       pname   Specifies  the  symbolic	 name of the value(s) to be returned.
	       Must be either GL_TEXTURE_GEN_MODE or the name of one  of  the
	       texture	 generation   plane   equations:  GL_OBJECT_PLANE  or
	       GL_EYE_PLANE.

       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 GL_S, GL_T, GL_R, or GL_Q.

       pname specifies one of three symbolic names:

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

       GL_OBJECT_PLANE		   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  representa-
				   tion.

       GL_EYE_PLANE		   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  GL_ARB_multitexture  extension  is  supported,  glGetTexGen
       returns	the  texture  coordinate generation parameters for the active
       texture unit.

ERRORS
       GL_INVALID_ENUM is generated if coord or	 pname	is  not	 an  accepted
       value.

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

SEE ALSO
       glActiveTextureARB(3G), glTexGen(3G)



							      GLGETTEXGEN(3G)