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 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.
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
glTexGen