TVP4020
Programmers Reference Manual
Graphics Programming
105
// If software writemasks are to be used then they are
// set appropriately, and the framebuffer set-up to do
// extra read operation
// Disable the Color DDA unit, we do not want to
// associate a color with this fragment.
colorDDAMode.UnitEnable = PERMEDIA_FALSE
ColorDDAMode(colorDDAMode)
// Define the region we wish to copy from.
StartXDom (200<<16)
StartXSub (300<<16)
dXSub (0)
dXDom (0)
StartY (0)
dY (1<<16)
Count (100)
render.PrimitiveType = PERMEDIA_TRAPEZOID
Render (render)
// Start the rasterization
5.11
Color DDA Unit
The Color DDA unit is used to associate a color with a fragment
produced by the Rasterizer. This unit should be enabled for rendering
operations and disabled for pixel rectangle operations (i.e. copies,
uploads and downloads).
5.11.1
RGBA and Color-Index(CI) Modes
Two color modes are supported by P
ERMEDIA
, true color RGBA and
color index (CI).
P
ERMEDIA
's internal color representation is RGBA with 8 bits per
component:
0
8
16
24
31
Blue
Alpha
Green
Red
Figure 5.37
Color Representation
This format is the same for all the different framebuffer configurations
supported. If the number of bits in the framebuffer for a color component
is less than 8 then the color value is left shifted into the most significant
bits of that components field. The unused least significant bits should be
set to zero.
Содержание TVP4020 PERMEDIA 2
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