glGetTexGen(3G)glGetTexGen(3G)NAME
glGetTexGen, glGetTexGendv, glGetTexGendfv, glGetTexGeniv - return tex‐
ture coordinate generation parameters
SYNOPSIS
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
Specifies a texture coordinate. Must be GL_S, GL_T, GL_R, or GL_Q.
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. Returns the
requested data.
DESCRIPTIONglGetTexGen() returns in params selected parameters of a texture coor‐
dinate 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: params returns the single-
valued texture generation function, a symbolic constant. The initial
value is GL_EYE_LINEAR. params returns the four plane equation coeffi‐
cients that specify object linear-coordinate generation. Integer val‐
ues, when requested, are mapped directly from the internal floating-
point representation. params returns the four plane equation coeffi‐
cients 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 coordi‐
nates. 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 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 ALSOglActiveTextureARB(3), glTexGen(3)glGetTexGen(3G)