HP b2600 OpenGL 1.1 Reference for HP-UX 11.x - Page 202

G glGetMaterial 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 202 Chapter 7