User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0

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• Z buffering is not supported (Z_en is overloaded to 0).

• State variables that have a context1 are: blend_en, dest_blend(3:0), src_blend(3:0), xoffset(11:0),

yoffset(11:0), all Dest Buffer format variable packet, all Map Info packet, Map Cache enable.

• Limit support on FVF packet format is supported: TX coordinate count =1,

Specular_Fog_Present=0, Diffuse_Alpha_Present= programmable, Z_Offset_Present=0, Position

Mask= programmable.

• Context 1 is intended to be used for StretchBLT.

In Context 1, Blending is not supported for Stretch-BLT. In this context, Blending is only supported for

Sub-Picture.