HP c3700 - Workstation, Reference Manual, Page: 197 / 486

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glGetLight
Chapter 7
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params returns four integer or floating-point values representing the diffuse intensity of
the light source. 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 for GL_LIGHT0 is (1, 1, 1, 1); for other lights, the initial
value is (0, 0, 0, 0).
GL_SPECULAR
params returns four integer or floating-point values representing the specular intensity
of the light source. 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 for GL_LIGHT0 is (1, 1, 1, 1); for other lights, the
initial value is (0, 0, 0, 0).
GL_POSITION
params returns four integer or floating-point values representing the position of the
light source. Integer values, when requested, are computed by rounding the internal
floating-point values to the nearest integer value. The returned values are those
maintained in eye coordinates. They will not be equal to the values specified using
glLight, unless the modelview matrix was identity at the time glLight was called. The
initial value is (0, 0, 1, 0).
GL_SPOT_DIRECTION
params returns three integer or floating-point values representing the direction of the
light source. Integer values, when requested, are computed by rounding the internal
floating-point values to the nearest integer value. The returned values are those
maintained in eye coordinates. They will not be equal to the values specified using
glLight, unless the modelview matrix was identity at the time glLight was called.
Although spot direction is normalized before being used in the lighting equation, the
returned values are the transformed versions of the specified values prior to
normalization. The initial value is (0, 0, - 1).
GL_SPOT_EXPONENT
params returns a single integer or floating-point value representing the spot exponent of
the light. An integer value, when requested, is computed by rounding the internal
floating-point representation to the nearest integer. The initial value is 0.
GL_SPOT_CUTOFF
params returns a single integer or floating-point value representing the spot cutoff angle
of the light. An integer value, when requested, is computed by rounding the internal
floating-point representation to the nearest integer. The initial value is 180.
GL_CONSTANT_ATTENUATION
params returns a single integer or floating-point value representing the constant (not
distance-related) attenuation of the light. An integer value, when requested, is computed
by rounding the internal floating-point representation to the nearest integer. The initial
value is 1.
GL_LINEAR_ATTENUATION