fglGetTexGen(3G) OpenGL Reference fglGetTexGen(3G)NAME
fglGetTexGendv, fglGetTexGenfv, fglGetTexGeniv - return texture
coordinate generation parameters
FORTRAN SPECIFICATION
SUBROUTINE fglGetTexGendv( INTEGER*4 coord,
INTEGER*4 pname,
CHARACTER*8 params )
SUBROUTINE fglGetTexGenfv( INTEGER*4 coord,
INTEGER*4 pname,
CHARACTER*8 params )
SUBROUTINE fglGetTexGeniv( INTEGER*4 coord,
INTEGER*4 pname,
CHARACTER*8 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
fglGetTexGen returns in params selected parameters of a texture
coordinate generation function that was specified using fglTexGen. 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_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
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fglGetTexGen(3G) OpenGL Reference fglGetTexGen(3G)
values specified using fglTexGen, unless the
modelview matrix was identity when fglTexGen
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 fglGetTexGen is executed between the
execution of fglBegin and the corresponding execution of fglEnd.
SEE ALSO
fglTexGen
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