X-Git-Url: http://4ch.mooo.com/gitweb/?p=16.git;a=blobdiff_plain;f=design.txt;h=6d265f0bab07ba1449abbb53143ddab050da88e6;hp=a7ff175facf2d5e489f701e4ac95e9076906444b;hb=b5ededfe58e26c2b8e012c7aeac95986b07bf81e;hpb=2177bf4b67192600b351abd549a43053162e3321

diff --git a/design.txt b/design.txt
index a7ff175f..6d265f0b 100755
--- a/design.txt
+++ b/design.txt
@@ -57,3 +57,30 @@ be used to turn off stack checking, so no stack checking routines get called.
 00:20:21   joncampbell123 | yes.                                                                           │
 00:20:29   sparky4_derpy4 | scroll16 needs a bunch of work                                                 │
 00:20:29   joncampbell123 | the less you declare on the stack, the less stack the function needs.
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+[15:03]	joncampbell123m	Think of it this way
+[15:03]	joncampbell123m	If something moves or changes frame
+[15:04]	joncampbell123m	then a rectangular region around the sprite needs to be redrawn
+[15:05]	joncampbell123m	So you collect update regions together
+[15:06]	joncampbell123m	based on performance vs overlap
+[15:06]	joncampbell123m	combine the rectangles together and redraw the screen they cover
+[15:07]	joncampbell123m	the simplest way is to compute a rectangle that covers them all
+[15:07]	joncampbell123m	then redraw that.
+[15:08]	joncampbell123m	Then optimize the code from there how you handle it
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+screen set up 2 rendering screens lock together
+1 scrolls the other one follow
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+pointers from 2nd screen follows the 1st
+size and dimentions and stuff are the same but addresses are different
+data is different 
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+https://www.quora.com/How-such-smooth-scrolling-was-achieved-in-games-like-Super-Mario-and-Commander-Keen