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Integrated Functions (Continued)

4.4.3.3

Color Patterns

Setting the pattern mode to 11b (GX_BASE+8200h[9:8] =

11b), in the GP_RASTER_MODE register selects the color

patterns. 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

renderedusing

thecolor

specifiedinthe

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 to the

frame buffer. The definition of the ROP value matches that

of the Microsoft API (application programming interface).

This allows Windows display drivers to load the raster oper-

ation directly into hardware. Table 4-21 illustrates this defi-

nition. Some common raster operations are described in

Table 4-22.

Table 4-21. 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 4-22. 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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