G
glGetMaterial
Chapter 7
202
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.
Notes
If an error is generated, no change is made to the contents of params.
Errors
• 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.
See Also
glMaterial
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