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Integrated Functions (Continued)

4.4.3.3

Color Patterns

Color patterns are selected by setting the pattern mode to

11 b in the GP_RASTER_MODE register. Bits [63:0] are

used to hold a row of pattern data for an 8-BPP pattern,

with bits [7:0] corresponding to the leftmost pixel of the

row. Likewise, bits [127:0] are used for a 16-BPP color

pattern, with bits [15:0] corresponding to the leftmost pixel

of the row.

To support an 8x8 color pattern, software must load the

pattern data for each row.

4.4.4

Source Expansion

The graphics pipeline contains hardware support for color

expansion of source data (primarily used for text). Those

pixels corresponding to a clear bit (0) in the source data

are

rendered

using

the

color

specified

the

GP_SRC_COLOR_0 register (GX_BASE+810Ch), and

those pixels corresponding to a set bit (1) in the source

data are rendered using the color specified in the

GP_SRC_COLOR_1 register (GX_BASE+810Eh).

the

source

transparency

bit

set

the

GP_RASTER_MODE register, those pixels corresponding

to a clear bit (0) in the source data are not drawn.

4.4.5

Raster Operations

The GP_RASTER_MODE register specifies how the pat-

tern data, source data (color-expanded if necessary), and

destination data are combined to produce the output from

the graphics pipeline. The definition of the ROP valu

matches that of the Microsoft API. This allows Windows

display drivers to load the raster operation directly into

hardware. Table 4-22 illustrates this definition. Some com-

mon raster operations are described in Table 4-23.

Table 4-22. GP_RASTER_MODE Bit Patterns

Pattern

(bit)

Source

(bit)

Destination

(bit)

Output

(bit)

ROP[0]

ROP[1]

ROP[2]

ROP[3]

ROP[4]

ROP[5]

ROP[6]

ROP[7]

Table 4-23. Common Raster Operations

ROP

Description

F0h

Output = Pattern

CCh

Output = source

5Ah

Output = Pattern XOR destination

66h

Output = Source XOR destination

55h

Output = ~Destination

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