Stacken/c64-livecoding
6
0
Fork 0
Code Issues 1 Pull requests Projects Releases Packages Wiki Activity Actions

Pushed performance improvement from line_down to line_up

Browse source
This commit is contained in:
hugova 2025-04-03 00:41:21 +02:00
parent adef2c0f56
commit 18c08d6b2b
1 changed files with 7 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
wip-hugo/routines/line/line_up.s
View file

@ -43,7 +43,11 @@ end_selfmod:
jsr pixel_draw jsr pixel_draw
Sub_16 >btp_mem_pos, <btp_mem_pos, #$01, #$00 ;; Y has always a offset of at least 1 Sub_16 >btp_mem_pos, <btp_mem_pos, #$01, #$00 ;; Y has always a offset of at least 1
LDY #$01 LDY #$01
LDX X_pos ;; X = X_end - X_pos
LDA X_end
SEC
SBC X_pos
TAX
for_x: for_x:
LDA byte_to_paint LDA byte_to_paint
ORA (>btp_mem_pos), Y ORA (>btp_mem_pos), Y
@ -56,8 +60,8 @@ move_8px_left:
LDA #%10000000 LDA #%10000000
STA byte_to_paint STA byte_to_paint
increment_pixel_x_end: increment_pixel_x_end:
INX DEX
CPX X_end ;CPX X_end
BEQ end BEQ end
Lag_16 >D, <D, #$00, #$02, case_2 Lag_16 >D, <D, #$00, #$02, case_2
case_1: case_1: