Apple-2-SW/prog8
1
0
Fork 0
mirror of https://github.com/irmen/prog8.git synced 2025-01-12 19:29:50 +00:00
Code Issues Projects Releases Wiki Activity

optimize text rendering in gfx2

Browse Source
This commit is contained in:
Irmen de Jong 2023-07-03 21:45:09 +02:00
parent f9200a2b75
commit ee3e3a3a40
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
compiler/res/prog8lib/cx16/gfx2.p8
View File

@ -1075,11 +1075,12 @@ skip:
cx16.r8 = y
while @(sctextptr) {
chardataptr = charset_addr + (@(sctextptr) as uword)*8
cx16.vaddr(charset_bank, chardataptr, 1, true) ; for reading the chardata from Vera data channel 1
repeat 8 {
; TODO rewrite this inner loop partly in assembly
; TODO rewrite this inner loop partly in assembly:
; requires expanding the charbits to 2-bits per pixel (based on color)
; also it's way more efficient to draw whole horizontal spans instead of per-character
cx16.r9L = cx16.vpeek(charset_bank, chardataptr) ; get the 8 horizontal character bits
cx16.r9L = cx16.VERA_DATA1 ; get the next 8 horizontal character bits
cx16.r7 = x
repeat 8 {
cx16.r9L <<= 1
@ -1087,7 +1088,6 @@ skip:
plot(cx16.r7, cx16.r8, cx16.r11L)
cx16.r7++
}
chardataptr++
cx16.r8++
}
x+=8