PPU pattern tables: Difference between revisions
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(Origin of "left" and "right" nicknames) |
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Backgrounds and sprites are drawn with tiles. | |||
The pattern table, at $0000-$1FFF in PPU address space, defines the shapes of these tiles. | |||
Each tile in the pattern table is 16 bytes, made of two planes. | |||
The first plane controls bit 0 of the color; the second plane controls bit 1. Any pixel whose color is 0 is background/transparent (represented by '.' in the following diagram): | |||
Bit Planes Pixel Pattern | Bit Planes Pixel Pattern | ||
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$0xxE=$42 01000010 | $0xxE=$42 01000010 | ||
$0xxF=$87 10000111 | $0xxF=$87 10000111 | ||
The pattern table is divided into two 256-tile sections: $0000-$0FFF, nicknamed "left", and $1000-$1FFF, nicknamed "right". | |||
(The nicknames come from how emulators with a debugger display the pattern table, as 128x128 pixel square and laid them out side by side.) | |||
Revision as of 13:09, 28 March 2010
Backgrounds and sprites are drawn with tiles. The pattern table, at $0000-$1FFF in PPU address space, defines the shapes of these tiles. Each tile in the pattern table is 16 bytes, made of two planes. The first plane controls bit 0 of the color; the second plane controls bit 1. Any pixel whose color is 0 is background/transparent (represented by '.' in the following diagram):
Bit Planes Pixel Pattern
$0xx0=$41 01000001
$0xx1=$C2 11000010
$0xx2=$44 01000100
$0xx3=$48 01001000
$0xx4=$10 00010000
$0xx5=$20 00100000 .1.....3
$0xx6=$40 01000000 11....3.
$0xx7=$80 10000000 ===== .1...3..
.1..3...
$0xx8=$01 00000001 ===== ...3.22.
$0xx9=$02 00000010 ..3....2
$0xxA=$04 00000100 .3....2.
$0xxB=$08 00001000 3....222
$0xxC=$16 00010110
$0xxD=$21 00100001
$0xxE=$42 01000010
$0xxF=$87 10000111
The pattern table is divided into two 256-tile sections: $0000-$0FFF, nicknamed "left", and $1000-$1FFF, nicknamed "right". (The nicknames come from how emulators with a debugger display the pattern table, as 128x128 pixel square and laid them out side by side.)
