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Graphics Programming
TVP4020
Programmers Reference Manual
46
4
FogEnable
When set enables the fog calculations. This field is
qualified by the FogEnable bit in the Draw command.
5
TextureEnable
When set enables the texture calculations. This field
is qualified by the TextureEnable bit in the Draw
command.
6
SmoothShadingEnable
When set enables the color calculations.
7
DepthEnable
When set enables the depth calculations.
8
SpecularTextureEnable
When set enables the specular texture calculations.
9
DiffuseTextureEnable
When set enables the diffuse texture calculations.
10
SubPixelCorrectionEnabl
e
When set provides the subpixel correction in Y. This
is qualified by the SubPixelCorrectionEnable in the
Draw command.
11
DiamondExit
When set enables the application of the OpenGL
'Diamond-exit' rule to modify the start and end
coordinates of lines.
12
NoDraw
When set prevents a Render command from being
sent to the rendering devices. This field only affects
the Draw commands.
This field allows the host to alter the set-up
parameters before sending a Render command.
13
ClampEnable
When set causes the input values to be clamped to a
parameter specific range. Note that the texture
parameters are not affected by this field.
14,
15
TextureParameterMode
These field causes the texture parameters to be:
0:
Used as given
1:
Clamped to lie in the range -1.0 to 1.0
2:
Normalize to lie in the range -1.0 to 1.0
16
Reserved
17
BackFaceCull
When set enables backface culling of triangles.
Rejection is based on the sign of the area of the
triangle, wve or -ve is controlled by the draw
command.
18
ColorOrder
Specifies order of colors in V*PackedColor
messages.
Bit 31 Bit 0
0 = Alpha, Blue, Green, Red
1 = Alpha, Red, Green, Blue
Each color component is 8 bits.
Table 5.3
DeltaMode Register Bit Field Assignments.
Any unused bits in the DeltaMode register should be set to zero.
Note that any Repeat commands will use the DeltaMode values which
were in effect when the corresponding Draw command was issued.
5.2.5
Rasterizer Modes
The only Delta specific requirement for the rendering modes in the
Rasterizer Unit is that the BiasCoordinates bits in the RasterizerMode
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 ...