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GLGETTEXGEN(3G)			 OpenGL Manual		       GLGETTEXGEN(3G)

NAME
       glGetTexGen - 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 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.

       For OpenGL versions 1.3 and greater, or when the 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
       glActiveTexture(), glTexGen()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		       GLGETTEXGEN(3G)

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