glGetLightfv function
The glGetLightfv and glGetLightiv functions return light source parameter values.
Syntax
void WINAPI glGetLightfv(
GLenum light,
GLenum pname,
GLfloat *params
);
Parameters
 light

A light source. The number of possible lights depends on the implementation, but at least eight lights are supported. They are identified by symbolic names of the form GL_LIGHT i where 0 ≤ i < GL_MAX_LIGHTS.
 pname

A light source parameter for light. The following symbolic names are accepted.
Value Meaning  GL_AMBIENT
The params parameter returns four integer or floatingpoint values representing the ambient intensity of the light source. Integer values, when requested, are linearly mapped from the internal floatingpoint 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.
 GL_DIFFUSE
The params parameter returns four integer or floatingpoint values representing the diffuse intensity of the light source. Integer values, when requested, are linearly mapped from the internal floatingpoint 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.
 GL_SPECULAR
The params parameter returns four integer or floatingpoint values representing the specular intensity of the light source. Integer values, when requested, are linearly mapped from the internal floatingpoint 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.
 GL_POSITION
The params parameter returns four integer or floatingpoint values representing the position of the light source. Integer values, when requested, are computed by rounding the internal floatingpoint 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 identified at the time glLight was called.
 GL_SPOT_DIRECTION
The params parameter returns three integer or floatingpoint values representing the direction of the light source. Integer values, when requested, are computed by rounding the internal floatingpoint 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 identified 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.
 GL_SPOT_EXPONENT
The params parameter returns a single integer or floatingpoint value representing the spot exponent of the light. An integer value, when requested, is computed by rounding the internal floatingpoint representation to the nearest integer.
 GL_SPOT_CUTOFF
The params parameter returns a single integer or floatingpoint value representing the spot cutoff angle of the light. An integer value, when requested, is computed by rounding the internal floatingpoint representation to the nearest integer.
 GL_CONSTANT_ATTENUATION
The params parameter returns a single integer or floatingpoint value representing the constant (not distancerelated) attenuation of the light. An integer value, when requested, is computed by rounding the internal floatingpoint representation to the nearest integer.
 GL_LINEAR_ATTENUATION
The params parameter returns a single integer or floatingpoint value representing the linear attenuation of the light. An integer value, when requested, is computed by rounding the internal floatingpoint representation to the nearest integer.
 GL_QUADRATIC_ATTENUATION
The params parameter returns a single integer or floatingpoint value representing the quadratic attenuation of the light. An integer value, when requested, is computed by rounding the internal floatingpoint representation to the nearest integer.
 params

Returns the requested data.
Return value
This function does not return a value.
Remarks
The glGetLight function returns in params the value or values of a light source parameter. The light parameter names the light and is a symbolic name of the form GL_LIGHTi for 0 ≤ i < GL_MAX_LIGHTS, where GL_MAX_LIGHTS is an implementationdependent constant that is greater than or equal to eight. The pname parameter specifies one of ten light source parameters, again by symbolic name.
It is always the case that GL_LIGHTi = GL_LIGHT0 + i.
If an error is generated, no change is made to the contents of params.
Requirements
Minimum supported client  Windows 2000 Professional [desktop apps only] 

Minimum supported server  Windows 2000 Server [desktop apps only] 
Header 

Library 

DLL 

See also