glGetTexGen, glGetTexGendv, glGetTexGendfv, glGetTexGeniv
- return texture coordinate generation parameters
void glGetTexGendv(
GLenum coord,
GLenum pname,
GLdouble *params ); void glGetTexGenfv(
GLenum coord,
GLenum pname,
GLfloat *params ); void glGetTexGeniv(
GLenum coord,
GLenum pname,
GLint *params );
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.
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: params
returns the single-valued texture generation function, a
symbolic constant. The initial value is GL_EYE_LINEAR.
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. 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.
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.
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().
glActiveTextureARB(3), glTexGen(3)
glGetTexGen(3G)
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