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5564 serge 1 
XXX this could be converted/formatted for Sphinx someday.
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XXX do not use tabs in this file.
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            position                     ]
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            primary/secondary colors     ]
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            generics (normals,           ]
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               texcoords, fog)           ] User vertices / arrays
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            point size                   ]
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            edge flag                    ]
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            primitive ID                 } System-generated values
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            vertex ID                    }
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              | | |
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              V V V
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      +-------------------+
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      |  Vertex shader    |
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      +-------------------+
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              | | |
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              V V V
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            position
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            clip distance
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            generics
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            front/back & primary/secondary colors
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            point size
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            edge flag
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            primitive ID
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              | | |
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              V V V
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      +------------------------+
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      |     Geometry shader    |
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      | (consume vertex ID)    |
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      | (may change prim type) |
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      +------------------------+
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              | | |
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              V V V
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            [...]
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            fb layer
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              | | |
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              V V V
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      +--------------------------+
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      |         Clipper          |
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      | (consume clip distances) |
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      +--------------------------+
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              | | |
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              V V V
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      +-------------------+
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      |  Polygon Culling  |
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      +-------------------+
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              | | |
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              V V V
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      +-----------------------+
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      |    Choose front or    |
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      |    back face color    |
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      | (consume other color) |
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      +-----------------------+
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              | | |
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              V V V
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            [...]
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            primary/secondary colors only
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              | | |
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              V V V
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      +-------------------+
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      |   Polygon Offset  |
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      +-------------------+
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              | | |
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              V V V
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      +----------------------+
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      | Unfilled polygons    |
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      | (consume edge flags) |
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      | (change prim type)   |
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      +----------------------+
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              | | |
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              V V V
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            position
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            generics
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            primary/secondary colors
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            point size
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            primitive ID
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            fb layer
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              | | |
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              V V V
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  +---------------------------------+
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  | Optional Draw module helpers    |
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  | * Polygon Stipple               |
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  | * Line Stipple                  |
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  | * Line AA/smooth (as tris)      |
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  | * Wide lines (as tris)          |
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  | * Wide points/sprites (as tris) |
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  | * Point AA/smooth (as tris)     |
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  | (NOTE: these stages may emit    |
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  |  new/extra generic attributes   |
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  |  such as texcoords)             |
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  +---------------------------------+
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              | | |
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              V V V
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            position                     ]
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            generics (+ new/extra ones)  ]
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            primary/secondary colors     ] Software rast vertices
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            point size                   ]
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            primitive ID                 ]
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            fb layer                     ]
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              | | |
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              V V V
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      +---------------------+
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      | Triangle/Line/Point |
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      |    Rasterization    |
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      +---------------------+
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              | | |
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              V V V
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            generic attribs
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            primary/secondary colors
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            primitive ID
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            fragment win coord pos   } System-generated values
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            front/back face flag     }
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              | | |
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              V V V
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      +-------------------+
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      |  Fragment shader  |
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      +-------------------+
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              | | |
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              V V V
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            zero or more colors
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            zero or one Z value
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NOTE: The instance ID is not shown.  It can be imagined to be a global variable
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accessible to all shader stages.