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- bbbbaaaacccckkkkbbbbuuuu((((3333GGGG)))) bbbbaaaacccckkkkbbbbuuuu((((3333GGGG))))
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- NNNNAAAAMMMMEEEE
- bbbbaaaacccckkkkbbbbuuuu,,,, ffffrrrroooonnnnttttbbbb - enable and disable drawing to the back or front buffer
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- FFFFOOOORRRRTTTTRRRRAAAANNNN 77777777 SSSSPPPPEEEECCCCIIIIFFFFIIIICCCCAAAATTTTIIIIOOOONNNN
- ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee bbbbaaaacccckkkkbbbbuuuu((((bbbb))))
- llllooooggggiiiiccccaaaallll bbbb
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- ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee ffffrrrroooonnnnttttbbbb((((bbbb))))
- llllooooggggiiiiccccaaaallll bbbb
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- PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRRSSSS
- _b is either .TRUE. or .FALSE..
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- ....TTTTRRRRUUUUEEEE.... enables updating in the back/front bitplane buffer.
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- ....FFFFAAAALLLLSSSSEEEE.... disables updating in the back/front bitplane buffer.
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- The GL supports four separate framebuffers: pop-up, overlay, underlay,
- and normal. Three of these framebuffers, overlay, underlay, and normal,
- can be configured in double buffer mode. When so configured, a
- framebuffer includes two color bitplane buffers: one visible bitplane
- buffer, called the front buffer, and one non-visible bitplane buffer,
- called the back buffer. The commands sssswwwwaaaappppbbbbuuuu and mmmmsssswwwwaaaappppbbbb interchange the
- front and back buffer assignments.
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- By default, when a framebuffer is configured in double buffer mode,
- drawing is enabled in the back buffer, and disabled in the front buffer.
- ffffrrrroooonnnnttttbbbb and bbbbaaaacccckkkkbbbbuuuu enable and disable drawing into the front and back
- buffers, allowing the default to be overriden. It is acceptable to
- enable neither front nor back, either front or back, or both front and
- back simultaneously. Note, for example, that z-buffer drawing continues
- to update the z-buffer with depth values when neither the front buffer
- nor the back buffer is enabled for drawing.
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- ffffrrrroooonnnnttttbbbb and bbbbaaaacccckkkkbbbbuuuu state is maintained separately for each of the overlay,
- underlay, and normal framebuffers. Calls to these routines affect the
- framebuffer that is currently active, based on the current drawmode.
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- bbbbaaaacccckkkkbbbbuuuu is ignored when the currently active framebuffer is in single
- buffer mode. ffffrrrroooonnnnttttbbbb is also ignored when the currently active
- framebuffer is in single buffer mode, unless zzzzddddrrrraaaawwww is enabled for that
- framebuffer (see zzzzddddrrrraaaawwww).
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- After each call to ggggccccoooonnnnffffiiii, bbbbaaaacccckkkkbbbbuuuu is enabled and ffffrrrroooonnnnttttbbbb is disabled.
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- drawmo, double, getbuf, gconfi, single, swapbu, zdraw, rightb, leftbu
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- PPPPaaaaggggeeee 1111
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- bbbbaaaacccckkkkbbbbuuuu((((3333GGGG)))) bbbbaaaacccckkkkbbbbuuuu((((3333GGGG))))
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- NOTE
- IRIS-4D G, GT, and GTX models, the Personal Iris, Indigo Entry, Indy, XL,
- XS, XS24, XZ, Elan and Extreme systems do not support double buffer
- operation in the overlay and underlay framebuffers. IRIS-4D
- RealityEngine model does not support double buffer operation in the
- underlay framebuffer.
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- At most four color buffers, such as front-left, front-right, back-left,
- back-right, and zdraw, can be rendered into simultaneously on the IRIS-4D
- RealityEngine model.
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- PPPPaaaaggggeeee 2222
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