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Tweak for markdown formatting

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Andy McFadden 2015-08-21 14:25:09 -07:00
parent 7dec278244
commit 5a0dcf327e
1 changed files with 4 additions and 4 deletions
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@ -353,8 +353,8 @@ screen holes.
At the extreme end of space over speed is the Applesoft ROM routine -- HGR At the extreme end of space over speed is the Applesoft ROM routine -- HGR
or "CALL 62454" -- which only needs about 30 bytes for its main loop, but or "CALL 62454" -- which only needs about 30 bytes for its main loop, but
takes (8192*33)+(12*64)+17 = 271121 cycles for black or white, or takes (8192 * 33)+(12 * 64)+17 = 271121 cycles for black or white, or
(8192*40)+(12*64)+17 = 328465 cycles for green/purple/blue/orange -- (8192 * 40)+(12 * 64)+17 = 328465 cycles for green/purple/blue/orange --
7-8x slower than our preferred implementation. 7-8x slower than our preferred implementation.
The screen clear is wired to a specific hi-res page, so the SetPage The screen clear is wired to a specific hi-res page, so the SetPage
@ -598,7 +598,7 @@ and then created a list of line segments using the vertex indices:
HPLOT #0 TO #3 HPLOT #0 TO #3
HPLOT #1 TO #2 HPLOT #1 TO #2
This requires (4*2) + (6*2) = 20 bytes, for a small savings. The real This requires (4 * 2) + (6 * 2) = 20 bytes, for a small savings. The real
value in the approach is that it separates the description of the shape value in the approach is that it separates the description of the shape
from the placement of the points. For example, if you want to change from the placement of the points. For example, if you want to change
vertex #0 to (CX-7,CY-12), you don't have to make changes two three vertex #0 to (CX-7,CY-12), you don't have to make changes two three
@ -961,7 +961,7 @@ got overwritten by the JMP.)
With this change we're working at 5 cycles per byte, plus the loop With this change we're working at 5 cycles per byte, plus the loop
overhead. A full-screen FillRect will be about as fast as a Clear. overhead. A full-screen FillRect will be about as fast as a Clear.
There are a couple of down sides. First, you need 192*3=576 bytes to There are a couple of down sides. First, you need 192 * 3=576 bytes to
hold this pile of store instructions. If you're drawing a lot of filled hold this pile of store instructions. If you're drawing a lot of filled
rectangles, though, the 2x speed improvement would make the size penalty rectangles, though, the 2x speed improvement would make the size penalty
worthwhile. The other problem arises if you use double-buffered animation, worthwhile. The other problem arises if you use double-buffered animation,