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<STRONG>NAME</STRONG>
<STRONG>glGetTexGendv,</STRONG> <STRONG>glGetTexGenfv,</STRONG> <STRONG>glGetTexGeniv</STRONG> - return texture
coordinate generation parameters
<STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>
void <STRONG>glGetTexGendv</STRONG>( GLenum <EM>coord</EM>,
GLenum <EM>pname</EM>,
GLdouble *<EM>params</EM> )
void <STRONG>glGetTexGenfv</STRONG>( GLenum <EM>coord</EM>,
GLenum <EM>pname</EM>,
GLfloat *<EM>params</EM> )
void <STRONG>glGetTexGeniv</STRONG>( GLenum <EM>coord</EM>,
GLenum <EM>pname</EM>,
GLint *<EM>params</EM> )
<STRONG>PARAMETERS</STRONG>
<EM>coord</EM> Specifies a texture coordinate. Must be <STRONG>GL_S</STRONG>, <STRONG>GL_T</STRONG>,
<STRONG>GL_R</STRONG>, or <STRONG>GL_Q</STRONG>.
<EM>pname</EM> Specifies the symbolic name of the value(s) to be
returned. Must be either <STRONG>GL_TEXTURE_GEN_MODE</STRONG> or the
name of one of the texture generation plane
equations: <STRONG>GL_OBJECT_PLANE</STRONG> or <STRONG>GL_EYE_PLANE</STRONG>.
<EM>params</EM> Returns the requested data.
<STRONG>DESCRIPTION</STRONG>
<STRONG>glGetTexGen</STRONG> returns in <EM>params</EM> selected parameters of a
texture coordinate generation function that was specified
using <STRONG>glTexGen</STRONG>. <EM>coord</EM> names one of the (<EM>s</EM>, <EM>t</EM>, <EM>r</EM>, <EM>q</EM>) texture
coordinates, using the symbolic constant <STRONG>GL_S</STRONG>, <STRONG>GL_T</STRONG>, <STRONG>GL_R</STRONG>,
or <STRONG>GL_Q</STRONG>.
<EM>pname</EM> specifies one of three symbolic names:
<STRONG>GL_TEXTURE_GEN_MODE</STRONG> <EM>params</EM> returns the single-valued
texture generation function, a
symbolic constant. The initial
value is <STRONG>GL_EYE_LINEAR</STRONG>.
<STRONG>GL_OBJECT_PLANE</STRONG> <EM>params</EM> 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.
<STRONG>GL_EYE_PLANE</STRONG> <EM>params</EM> 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 <STRONG>glTexGen</STRONG>, unless
the modelview matrix was
identity when <STRONG>glTexGen</STRONG> was
called.
<STRONG>NOTES</STRONG>
If an error is generated, no change is made to the contents
of <EM>params</EM>.
<STRONG>ERRORS</STRONG>
<STRONG>GL_INVALID_ENUM</STRONG> is generated if <EM>coord</EM> or <EM>pname</EM> is not an
accepted value.
<STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glGetTexGen</STRONG> is executed
between the execution of <STRONG>glBegin</STRONG> and the corresponding
execution of <STRONG>glEnd</STRONG>.
<STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>
<STRONG>glTexGen</STRONG>
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