Graphics Register Reference
TVP4020
Programmers Reference Manual
174
Name:
Continue - New Dominant Edge
Unit:
Rasterizer
Region: 0
Offset:
0x0000.8048
Tag:
0x0009
Reset Value:
Undefined
Write
0
8
16
24
31
Reserved
12 bit unsigned integer
This command causes rasterization to continue with a new dominant edge. The dominant
edge DDA is reloaded with the new parameters. The subordinate edge is carried on from
the previous trapezoid. This allows any convex polygon to be broken down into a collection
of trapezoids and continuity maintained across boundaries.
Since this command only affects the Rasterizer DDA (and not of any other units), it is not
suitable for 3D operations.
The data field holds the number of scanlines to fill. Note this count does not get loaded
into the Count register.
Name:
Continue - New Line Segment
Unit:
Rasterizer
Region: 0
Offset:
0x0000.8040
Tag:
0x0008
Reset Value:
Undefined
Write
0
8
16
24
31
Reserved
12 bit unsigned integer
This command causes rasterization to continue for the next segment in a polyline. The XY
position is carried on from the previous line, however the fraction bits in the DDAs can be
kept, set to zero, one half, or nearly one half, under control of the RasterizerMode register.
The data field holds the number of pixels in a line. Note this count does not get loaded into
the Count register.
The use of ContinueNewLine is not recommended for OpenGL because the DDA units will
start with a slight error as compared with the value they would have been loaded with for
the second and subsequent segments.
ContinueNewDom
ContinueNewLine
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 ...