GLGETTEXGEN(3G) UNIX Programmer's Manual GLGETTEXGEN(3G)
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 equa-
tions: GL_OBJECT_PLANE or GL_EYE_PLANE.
params Returns the requested data.
DESCRIPTION
glGetTexGen returns in params selected parameters of a tex-
ture coordinate generation function that was specified using
glTexGen. coord names one of the (s, t, r, q) texture coor-
dinates, 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
MirBSD #10-current Printed 2021-12-07 1
GLGETTEXGEN(3G) UNIX Programmer's Manual GLGETTEXGEN(3G)
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.
When the GL_ARB_multitexture extension is supported,
glGetTexGen returns the texture coordinate generation param-
eters 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 exe-
cution of glEnd.
SEE ALSO
glActiveTextureARB(3G), glTexGen(3G)
MirBSD #10-current Printed 2021-12-07 2