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fix line draw bug, that snaps the end to exry 8th pixel

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hugova 2025-07-17 13:47:12 +02:00
parent 2caf71d8fe
commit 54fa061342
5 changed files with 5 additions and 6 deletions
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1
wip-hugo/routines/line/line_down.s
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@ -77,7 +77,6 @@ end_selfmod:
STA byte_to_paint STA byte_to_paint
;; X = X_end - X_pos ;; X = X_end - X_pos
LDX dx LDX dx
LDY #$00
for_x: for_x:
;; Paints A to address in |btp_mem_pos* + Y| ;; Paints A to address in |btp_mem_pos* + Y|
;; Y is pixel position in the chunk. Therefor it may be that Y = 0, 1, 2, 3, 4, ,5 ,6 ,7. ;; Y is pixel position in the chunk. Therefor it may be that Y = 0, 1, 2, 3, 4, ,5 ,6 ,7.

1
wip-hugo/routines/line/line_down_inv.s
View file

@ -51,7 +51,6 @@ selfmod:
end_selfmod: end_selfmod:
JSR pixel_calc ;;only used first pixel. after this relative position is abused JSR pixel_calc ;;only used first pixel. after this relative position is abused
STA byte_to_paint STA byte_to_paint
LDY #$00
LDX dy LDX dy
for_y: for_y:
LDA byte_to_paint LDA byte_to_paint

4
wip-hugo/routines/line/line_test_extensive.s
View file

@ -68,11 +68,11 @@ clear_screen_:
long_line_test_b: long_line_test_b:
LDA #$00 LDA #$00
STA X_pos_ STA X_pos_
LDA #$60 LDA #$00
STA Y_pos_ STA Y_pos_
LDA #$ff LDA #$ff
STA X_end STA X_end
LDA #$0 LDA #$60
STA Y_end STA Y_end
@loop: @loop:
LDA Y_pos_ LDA Y_pos_

3
wip-hugo/routines/line/line_up.s
View file

@ -54,7 +54,8 @@ end_selfmod:
JSR pixel_calc ;;only used first pixel. after this relative position is abused JSR pixel_calc ;;only used first pixel. after this relative position is abused
STA byte_to_paint STA byte_to_paint
Sub_16 btp_mem_pos, btp_mem_pos + 1, #$01, #$00 ;; Y has always a offset of at least 1 Sub_16 btp_mem_pos, btp_mem_pos + 1, #$01, #$00 ;; Y has always a offset of at least 1
LDY #$01 ;LDY #$01
INY
LDX dx LDX dx
for_x: for_x:
LDA byte_to_paint LDA byte_to_paint

2
wip-hugo/routines/line/line_up_inv.s
View file

@ -52,7 +52,7 @@ selfmod:
end_selfmod: end_selfmod:
JSR pixel_calc ;;only used first pixel. after this relative position is abused JSR pixel_calc ;;only used first pixel. after this relative position is abused
STA byte_to_paint STA byte_to_paint
LDY #$00 ;LDY #$00
LDX dy LDX dy
for_y: for_y:
LDA byte_to_paint LDA byte_to_paint