HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 165

Chapter 7 G glGet glGet glGetBooleanv, glGetDoublev, glGetFloatv, glGetIntegerv: return the value or values of a selected parameter. C Specification void glGetBooleanv( GLenum pname, GLboolean *params) void glGetDoublev( GLenum pname, GLdouble *params) void glGetFloatv( GLenum pname, GLfloat *params) void glGetIntegerv( GLenum pname, GLint *params) Parameters pname params Specifies the parameter value to be returned. The symbolic constants in the list below are accepted. Returns the value or values of the specified parameter. Description These four commands return values for simple state variables in GL. pname is a symbolic constant indicating the state variable to be returned, and params is a pointer to an array of the indicated type in which to place the returned data. Type conversion is performed if params has a different type than the state variable value being requested. If glGetBooleanv is called, a floating-point (or integer) value is converted to GL_FALSE if and only if it is 0.0 (or 0). Otherwise, it is converted to GL_TRUE. If glGetIntegerv is called, boolean values are returned as GL_TRUE or GL_FALSE, and most floating-point values are rounded to the nearest integer value. Floating-point colors and normals, however, are returned with a linear mapping that maps 1.0 to the most positive representable integer value, and - 1.0 to the most negative representable integer value. If glGetFloatv or glGetDoublev is called, boolean values are returned as GL_TRUE or GL_FALSE, and integer values are converted to floating-point values. The following symbolic constants are accepted by pname: GL_ACCUM_ALPHA_BITS params returns one value, the number of alpha bitplanes in the accumulation buffer. GL_ACCUM_BLUE_BITS params returns one value, the number of blue bitplanes in the accumulation buffer. 165