Graphics Register Reference
TVP4020
Programmers Reference Manual
194
Name:
Delta X Dominant
Unit:
Rasterizer
Region: 0
Offset:
0x0000.8008
Tag:
0x0001
Reset Value:
Undefined
Read/write
0
8
16
24
31
Not used
Sign
15 bit fraction
11 bit integer
Not used
Value added when moving from one scanline to the next for the dominant edge in
trapezoid filling. The value is in 2's complement 12.15 fixed point format.
Also holds the change in X when plotting lines. For Y major lines this will be some fraction
(dx/dy), otherwise it is normally ± 1.0, depending on the required scanning direction.
Name:
Delta X Subordinate
Unit:
Rasterizer
Region: 0
Offset:
0x0000.8018
Tag:
0x0003
Reset Value:
Undefined
Read/write
0
8
16
24
31
Not used
Sign
15 bit fraction
11 bit integer
Not used
Value added when moving from one scanline to the next for the subordinate edge in
trapezoid filling. The value is in 2's complement 12.15 fixed point format.
dXDom
dXSub
Summary of Contents for TVP4020 PERMEDIA 2
Page 1: ...Texas Instruments TVP4020 PERMEDIA 2 Programmer s Reference Manual Issue 4 ...
Page 284: ...TVP4020 Programmers Reference Manual A Gouraud Shaded Triangle 275 ...
Page 292: ...TVP4020 Programmers Reference Manual Register Tables 283 ...
Page 314: ...TVP4020 Programmers Reference Manual Index 305 ...
Page 315: ...Index TVP4020 Programmers Reference Manual 306 Index ...
Page 323: ...Index TVP4020 Programmers Reference Manual 314 ...