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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 (C) 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				    06/10/2014				  GLGETTEXGEN(3G)
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