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11-18
Display Interface
Power 9100 User Interface Controller
11.2.10 Drawing engine registers
The drawing engine registers control pixel processing. They are used define
foreground and background colors, plane masking, pattern and pattern
origins, pixel drawing window limits, and raster operation parameters.
These registers can only be read or written while the drawing engine is idle
(when the Busy bit in the status register contains ‘0’.
The registers in this category are summarized in Table 11-10.
Register
Bit
7
6
5
4
3
2
1
0
Out of Range (oor)
x_oor
y_oor
x[3]
x[2]
x[1]
x[0]
y[3]
y[2]
y[1]
y[0]
X Clip
x less than min
x greater than max
x[3]
x[2]
x[1]
x[0]
x[3]
x[2]
x[1]
x[0]
Y Clip
y less than min
y greater than
y[3]
y[2]
y[1]
y[0]
y[3]
y[2]
y[1]
y[0]
X Edge Less Than
0
0
x[0]>x[2]
x[1]>x[3]
x[3]>x[0]
x[2]>x[3]
x[1]>x[2]
x[0]>x[1]
X Edge Greater Than
0
0
x[0]<x[2]
x[1]<x[3]
x[3]<x[0]
x[2]<x[3]
x[1]<x[2]
x[0]<x[1]
Y Edge Less Than
0
0
y[0]>y[2]
y[1]>y[3]
y[3]>y[0]
y[2]>y[3]
y[1]>y[2]
y[0]>y[1]
Y Edge Greater Than
0
0
y[0]<y[2]
y[1]<y[3]
y[3]<y[0]
y[2]<y[3]
y[1]<y[2]
y[0]<y[1]
Table 11-9 Vertex Checking Register (Significant Bits)
Address
Name
Function
38002200
Foreground Color
Contains an 8-bit value that specifies the foreground color
380020204
Background Color
Contains an 8-bit value that specifies the background color
38002208
Plane Mask
Contains an 8-bit mask in bits 7:0. Bit 0 corresponds to
plane 0. A plane is enabled when the associated bit is set.
3800220C
Draw Mode
Controls writing within a picked window and selects the
destination buffer for drawing operations.
38002210
Pattern Origin x
Contain the 4-bit x and y origins of a 16 x 16-bit pattern to
be used by the quad command to fill polygons on the dis-
play.
38002214
Pattern Origin y
38002218
Raster
Specifies the parameters for a raster operation
3800221C
Pixel8
Provides temporary storage for excess bits from a Pixel8
operation. The data is stored in the lower part of the register
38002220
Window Minimum
These supply the window limits that the pixel processor
hardware uses to determine whether a pixel is to be drawn
38002224
Window Maximum
Table 11-10 Drawing Engine Registers Summar
S3GX_TRMBook Page 18 Friday, September 19, 1997 11:39 am
Содержание SPARCbook 3 series
Страница 1: ...Series Technical Reference Manual 980327 02 3 S3GX_TRMBook Page i Friday September 19 1997 11 39 am...
Страница 8: ...viii S3GX_TRMBook Page viii Friday September 19 1997 11 39 am...
Страница 28: ...1 16 Architecture Overview Microcontroller Subsystem S3GX_TRMBook Page 16 Friday September 19 1997 11 39 am...
Страница 44: ...2 16 The SPARC CPU SBus Controller S3GX_TRMBook Page 16 Friday September 19 1997 11 39 am...
Страница 76: ...5 8 SCSI Controller DMA Support S3GX_TRMBook Page 8 Friday September 19 1997 11 39 am...
Страница 82: ...6 6 Ethernet Interface DMA Support for Network Operations S3GX_TRMBook Page 6 Friday September 19 1997 11 39 am...
Страница 96: ...7 14 PCMCIA Interface Microcontroller Registers S3GX_TRMBook Page 14 Friday September 19 1997 11 39 am...
Страница 146: ...9 28 MODEM Class 2 Fax Command Set S3GX_TRMBook Page 28 Friday September 19 1997 11 39 am...
Страница 180: ...11 30 Display Interface RAMDAC S3GX_TRMBook Page 30 Friday September 19 1997 11 39 am...
Страница 210: ...B 10 Connector Information Removable Hard Drive SCSI Connector S3GX_TRMBook Page 10 Friday September 19 1997 11 39 am...
Страница 216: ...Index vi S3GX_TRMBook Page vi Friday September 19 1997 11 39 am...