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. The initial value is GL_EYE_LINEAR.
- 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.
- 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.
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