TVP4020
Programmers Reference Manual
Graphics Programming
81
16 bits integer
11 bits fraction
remaining bits
0
U
L
not used
sign bit
Figure 5.16
Depth Derivative Format
This data format is compatible with GLINT 300SX and GLINT 500TX
graphics processors. In many instances, the fractional part can be left
containing zero, avoiding the need to continually update ZStartL, dZdxL
and dZdyDomL.
The Depth unit must be enabled to update the depth buffer. If it is
disabled then the depth buffer will only be updated if ForceLBUpdate is
set in the Window register. If no updates of the localbuffer are required,
setting DisableLBUpdate in the Window register may improve
performance.
5.6.3
Registers
Stencil test is controlled by the StencilMode register:
0
8
16
24
31
Unit enable
Reserved
func
dppass
Update Method
Stencil source
dpfail
sfail
src
Unsigned compare function
Figure 5.17
StencilMode Register
The StencilData register holds the other data associated with the test.
0
8
16
24
31
Reference Stencil
Reserved
Reserved
Reserved
Compare Mask
Write Mask
Figure 5.18
StencilData Register
The stencil writemask is used to control which stencil planes are updated
as a result of the test. The Stencil register holds an externally sourced
stencil value. It is a 32bit register of which only the least significant bit is
used. The unused bits should be set to zero.
Содержание TVP4020 PERMEDIA 2
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