glGetTexGen
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.
- 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 at the time
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 glTexGen is called between
a call to glBegin and the corresponding
call to glEnd.
SEE ALSO
glTexGen
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© 1995 Uwe Behrens. All rights reserved.