XXX - Not complete yet!!!
Name

    SGIX_complex_polar

Name Strings

    GL_SGIX_complex_polar

Version

    $Date: 1996/06/12 03:45:06 $ $Revision: 1.2 $

Number

    ??

Dependencies

    SGIX_complex is required

Overview

    This extension generates the magnitude and phase of a complex input
    source.  Computing the spectrum (magnitude) and the phase of a
    fourier transform (a typical complex input source) is useful
    for signal and image processing applications.


Issues

    - this extension is somewhat of hack to work around the problem
      of generating only 1 component from an input that has 2 components:
      real and imaginary.  This extension is really computing 2 operations
      that, for generality, should be defined as atomic operations.
    
New Procedures and Functions

    None

New Tokens

    Accepted by the <cap> parameter of Enable, Disable, and IsEnabled, by the
    <pname> parameter of GetBooleanv, GetIntegerv, GetFloatv, and GetDoublev:

	COMPLEX_POLAR_EXT        0x????

Additions to Chapter 2 of the 1.0 Specification (OpenGL Operation)

    None

Additions to Chapter 3 of the 1.0 Specification (Rasterization)


****On RedTail we'll be implementing this through texture LUTs. However,
    the more natural fit would be to do it as a post blending operation.
    Thus, I'm unclear as to what chapter this description will fall in:

    The specification of generating the magnitude and phase of a fourier
    signal is added to the GL Specification in section X.X.X.  The resulting
    fragment will be:

	C_real' = SQRT((Cs_real * Cs_real) + (Cd_imaginary * Cd_imaginary))
	C_imaginary' = arctan(Cs_real / Cs_imaginary)

    where Cs_real and Cs_imaginary are the source fragment real and imaginary
    subcomponents and C_real' and C_imaginary' are the result fragment
    subcomponents.

    In all cases the above equation is evaluated separately for each
    color component.

Additions to Chapter 4 of the 1.0 Specification (Per-Fragment Operations
and the Frame Buffer)

    None

Additions to Chapter 5 of the GL Specification (Special Functions)

    None

Additions to Chapter 6 of the GL Specification (State and State Requests)

    None

Additions to the GLX Specification

    None

GLX Protocol

    None

Errors

    None

New State

    Get Value		Get Command	Type	Initial Value	Attribute
    ---------		-----------	----	-------------	---------
    COMPLEX_POLAR_EXT	IsEnabled	 B	False      	color-buffer

New Implementation Dependent State

    None