HP Workstation zx2000 HP OpenGL Implementation Guide for HP-UX 11.X (IPF versi - Page 23

rendering details, default visuals, EXP and EXP2 fogging, vertices outside of a begin/end pair

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Page 23 highlights

overview of OpenGL rendering details This section provides the details for several of HP's rendering capabilities. These rendering capabilities range from the way HP implements its default visuals to the way HP deals with the decomposition of concave quadrilaterals. default visuals Instead of placing the default visual in the deepest image buffer, HP puts the default visual in the overlay planes. EXP and EXP2 fogging The Virtual Memory Driver's implementation of fog applies fog per fragment. Hardware devices implement EXP and EXP2 fog per fragment and linear fog per vertex. vertices outside of a begin/end pair HP's implementation of this specification is indeterminate as defined by the OpenGL standard. index mode dithering If dithering is enabled in indexed visuals, 2D functions such as glDrawPixels() and glBitmap() will not be dithered. OpenGL implementation guide 1-19

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OpenGL implementation guide
1–19
overview of OpenGL
rendering details
This section provides the details for several of HP’s rendering capabilities. These rendering
capabilities range from the way HP implements its default visuals to the way HP deals with the
decomposition of concave quadrilaterals.
default visuals
Instead of placing the default visual in the deepest image buffer, HP puts the default visual in the
overlay planes.
EXP and EXP2 fogging
The Virtual Memory Driver’s implementation of fog applies fog per fragment. Hardware devices
implement EXP and EXP2 fog per fragment and linear fog per vertex.
vertices outside of a begin/end pair
HP’s implementation of this specification is indeterminate as defined by the OpenGL standard.
index mode dithering
If dithering is enabled in indexed visuals, 2D functions such as
glDrawPixels()
and
glBitmap()
will not be dithered.