glGetMaterialfv, glGetMaterialiv - return material parameters
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. 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. 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. 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], the corresponding integer return value is undefined. 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. 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. (The other parameters are all 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 called between a call to glBegin and the corresponding call to glEnd.
glMaterial
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Last Edited: Mon, May 22, 1995