at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 927

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Figure 44-10. Convex Polygon Fill
6249D–ATARM–20-Dec-07
Convex Polygon
ces. Color is selected by programming 2DGC_CSR and pattern is selected by programming
2DGC_LPR. The following registers need to be programmed to perform a polygon fill:
FD bitfield in 2DGC_FCR signals completion of the polygon fill operation.
Hardware polygon fill can render convex polygons. A convex polygon is rendered when a
straight line connecting any two points inside the polygon does not intersect any polygon edge.
Figure 44-10
registers (2DGC_VXRs and 2DGC_VYRs registers) in this order.
• 2DGC_VXRs: Vertex x of all vertices, limited to 16.
• 2DGC_VYRs: Vertex y of all vertices, limited to 16.
• 2DGC_FCR: Set CNTL bitfield to define the number of vertices.
• 2DGC_CSR: Set CLR[3:0] to select a color.
• 2DGC_LOR: Set LOC bitfield to select logic operation MOV.
• 2DGC_GOC: Set GOC and OP bitfields to appropriate values:
• 2DGC_LPR: Set
• LPT bitfield to select a pattern for the line. 0xFFFF is for solid.
(0,0)
(0,8)
Y
– Set GOC to select polygon fill.
– Set OP[0] to select 1D.
– Set OP[1] to select no update X & Y.
– Set OP[2] to select absolute.
– Set OP[3] to select no transformation.
shows a polygon of four vertices (4,2), (6,4), (4,6) and (2,4) to be loaded to vertex
(2,4)
DISPLAY
(4,2)
(4,6)
X
AT91SAM9263 Preliminary
(6,4)
(8,0)
(8,8)
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