GLGETTEXGEN(3G) 														   GLGETTEXGEN(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 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 coordinate 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 representation.

       GL_EYE_PLANE		   params  returns  the  four  plane equation coefficients that specify eye linear-coordinate generation.  Integer
				   values, when requested, are mapped directly from the internal floating-point representation.  The returned val-
				   ues 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  tex-
       ture 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)