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- zzzzssssoooouuuurrrrcccc((((3333GGGG)))) zzzzssssoooouuuurrrrcccc((((3333GGGG))))
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- NNNNAAAAMMMMEEEE
- zzzzssssoooouuuurrrrcccc - selects the source for z-buffering comparisons
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- FFFFOOOORRRRTTTTRRRRAAAANNNN 77777777 SSSSPPPPEEEECCCCIIIIFFFFIIIICCCCAAAATTTTIIIIOOOONNNN
- ssssuuuubbbbrrrroooouuuuttttiiiinnnneeee zzzzssssoooouuuurrrrcccc((((ssssrrrrcccc))))
- iiiinnnntttteeeeggggeeeerrrr****4444 ssssrrrrcccc
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- PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRRSSSS
- _s_r_c expects one of two possible values:
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- ZZZZSSSSRRRRCCCCDDDDEEEE, z-buffering is done by depth comparison (default).
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- ZZZZSSSSRRRRCCCCCCCCOOOO, z-buffering is done by color comparison.
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- By default z-buffer comparisons are done on depth data. However, in
- certain cases, it can be useful to z-buffer by comparing color values,
- especially the color index values generated by the linesmooth and
- pntsmooth hardware. When the ssssrrrrcccc parameter is ZSRCDE, the z-buffer
- operation is normal. When the ssssrrrrcccc parameter is ZSRCCO, however, source
- and destination color values are compared to determine which pixels the
- system draws. In this mode, the zbuffer is not updated when a pixel is
- written.
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- A separate zzzzssssoooouuuurrrrcccc mode is retained by each of the framebuffers: normal,
- popup, overlay, and underlay. The current draw mode determines which z
- source mode is used, and which is modified by zzzzssssoooouuuurrrrcccc.
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- drawmo, gversi, linesm, pntsmo, zbuffe, zfunct
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- NNNNOOOOTTTTEEEESSSS
- This subroutine does not function on IRIS-4D B or G models.
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- Currently z-buffer operation is supported only in the normal framebuffer.
- To insure compatibility with future releases of the GL, make calls to
- zzzzssssoooouuuurrrrcccc only while draw mode is NNNNOOOORRRRMMMMAAAALLLL.
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- Use zzzzssssoooouuuurrrrcccc((((ZZZZSSSSRRRRCCCCCCCCOOOO)))) for correct anti-aliasing support in color index mode
- on Iris Indy and Iris Indigo.
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- BBBBUUUUGGGGSSSS
- IRIS-4D GT and GTX models support zzzzssssoooouuuurrrrcccc((((ZZZZSSSSRRRRCCCCCCCCOOOO)))) only for non-subpixel
- positioned lines drawn after a lllliiiinnnneeeessssmmmm((((SSSSMMMMLLLLOOOONNNN)))) call.
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- On early serial numbers of the Personal Iris, ZSRCDE is the only
- supported setting for this routine. For compatibility, they accept the
- call zzzzssssoooouuuurrrrcccc((((ZZZZSSSSCCCCCCCCCCCCOOOO)))), but it has the same effect as calling
- zzzzffffuuuunnnncccctttt((((ZZZZFFFFAAAALLLLWWWWAAAA)))), which turns off z value comparison. This allows the
- unrestricted drawing of color values into the front and back buffers and
- depth values into the z-buffer. Use ggggvvvveeeerrrrssssiiii to determine which type of
- Personal Iris you have.
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- PPPPaaaaggggeeee 1111
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- zzzzssssoooouuuurrrrcccc((((3333GGGG)))) zzzzssssoooouuuurrrrcccc((((3333GGGG))))
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- IRIS-4D VGX models support zzzzssssoooouuuurrrrcccc((((ZZZZSSSSRRRRCCCCCCCCOOOO)))) only in color map mode.
- Stencil operation is undefined in this case.
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- PPPPaaaaggggeeee 2222
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