glGetMaterialfv, glGetMaterialiv - return material
parameters

glGetMaterialfv
	glGetMaterialfv(face, pname) -> params
glGetMaterialiv
	glGetMaterialiv(face, pname) -> params

void glGetMaterialfv(	GLenum face,
                      GLenum pname,
                      GLfloat	*params	)
void glGetMaterialiv(	GLenum face,
                      GLenum pname,
                      GLint *params )

face	  Specifies which of the two materials is being
        queried.  GL_FRONT or	GL_BACK	are accepted,
        representing the front and back materials,
        respectively.

pname	  Specifies the	material parameter to return.
        GL_AMBIENT, GL_DIFFUSE, GL_SPECULAR, GL_EMISSION,
        GL_SHININESS,	and GL_COLOR_INDEXES are accepted.

params  Returns the requested	data.

glGetMaterial	returns	in params the value or values of
parameter pname of material face. Six	parameters are
defined:

GL_AMBIENT		params returns four integer or
                      floating-point values representing the
                      ambient	reflectance of the material.
                      Integer	values,	when requested,	are
                      linearly mapped	from the internal
                      floating-point representation such
                      that 1.0 maps to the most positive
                      representable integer value, and -1.0
                      maps to	the most negative
                      representable integer value.  If the
                      internal value is outside the range
                      [-1, 1], the corresponding integer
                      return value is	undefined. The initial
                      value is (0.2, 0.2, 0.2, 1.0)

GL_DIFFUSE		params returns four integer or
                      floating-point values representing the
                      diffuse	reflectance of the material.
                      Integer	values,	when requested,	are
                      linearly mapped	from the internal
                      floating-point representation such
                      that 1.0 maps to the most positive
                      representable integer value, and -1.0
                      maps to	the most negative
                      representable integer value.  If the
                      internal value is outside the range
                      [-1, 1], the corresponding integer
                      return value is	undefined. The initial
                      value is (0.8, 0.8, 0.8, 1.0).

GL_SPECULAR		params returns four integer or
                      floating-point values representing the
                      specular reflectance of	the material.
                      Integer	values,	when requested,	are
                      linearly mapped	from the internal
                      floating-point representation such
                      that 1.0 maps to the most positive
                      representable integer value, and -1.0
                      maps to	the most negative
                      representable integer value.  If the
                      internal value is outside the range
                      [-1, 1], the corresponding integer
                      return value is	undefined. The initial
                      value is (0, 0,	0, 1).

GL_EMISSION		params returns four integer or
                      floating-point values representing the
                      emitted	light intensity	of the
                      material.  Integer values, when
                      requested, are linearly	mapped from
                      the internal floating-point
                      representation such that 1.0 maps to
                      the most positive representable
                      integer	value, and -1.0	maps to	the
                      most negative representable integer
                      value.	If the internal	value is
                      outside	the range [-1, 1.0], the
                      corresponding integer return value is
                      undefined. The initial value is	(0, 0,
                      0, 1).

GL_SHININESS		params returns one integer or
                      floating-point value representing the
                      specular exponent of the material.
                      Integer	values,	when requested,	are
                      computed by rounding the internal
                      floating-point value to	the nearest
                      integer	value. The initial value is 0.

GL_COLOR_INDEXES	params returns three integer or
                      floating-point values representing the
                      ambient, diffuse, and specular indices
                      of the material.  These	indices	are
                      used only for color index lighting.
                      (All the other parameters are used
                      only for RGBA lighting.)  Integer
                      values,	when requested,	are computed
                      by rounding the	internal floating-
                      point values to	the nearest integer
                      values.

If an	error is generated, no change is made to the contents
of params.

GL_INVALID_ENUM is generated if face or pname	is not an
accepted value.

GL_INVALID_OPERATION is generated if glGetMaterial is
executed between the execution of glBegin and	the
corresponding	execution of glEnd.

glMaterial