From 3fad901873c8dca71c6a75b2a3de94ad4c34bde3 Mon Sep 17 00:00:00 2001
From: Bjorn Einar Bjarntes <bjartnes@gmail.com>
Date: Sun, 19 Dec 2021 15:57:51 +0100
Subject: [PATCH] asking some questions

---
 src/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.c b/src/main.c
index ab33da4..f6d071a 100644
--- a/src/main.c
+++ b/src/main.c
@@ -36,12 +36,12 @@ BYTE isPositionWhite() {
 
 // https://archive.org/details/The_Graphics_Book_for_the_Commodore_65/page/n129/
 void setPositionWhite() {
-    // TODO this 8 times something divided must be just masking
     ad = 0x2000+ ((y >> 3) << 6) +((y >> 3) << 7)  +((y >> 3) << 7)  +  (y & 7)+(x&(0xfff8));
     *(short*)(ad) = *(short*)(ad) | 1 << ((7-(x & 7)));
 }
 
 void setPositionBlack() {
+    // TODO is it faster to somehow reuse y >> 3 than do it many times, and maybe add the same result twice...  
     ad = 0x2000+((y >> 3) << 6) +((y >> 3) << 7)  +((y >> 3) << 7) + (y & 7)+ (x&(0xfff8));
     *(short*)(ad) = (*(short*)(ad)) & ~(1 << ((7-(x & 7))));
 }