PATH ADC Home > Documentation > Hardware > Device Managers and Drivers > PCI Card Services > Designing PCI Cards and Drivers for Power Macintosh Computers

  

---

Gamma Table Errors

Graphics drivers should return an error code if the following fields of GammaTbl do not contain these values:

gVersion == 0

This is currently the only defined version of the gamma table structure.

gType == 0

This indicates that the gamma table is not dependent on the frame buffer hardware. Few existing gamma tables are frame buffer- specific. This field formerly contained a NuBus construct, drHWId, which is no longer applicable.

gChanCnt == 1 || gChanCnt == 3

Only one or three channels of correction data are supported.