Stacken/c64-livecoding
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fix small issues with linedraw

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hugova 2025-07-17 14:45:51 +02:00
parent 1ad8071f75
commit 8fe1c85a40
5 changed files with 18 additions and 16 deletions
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2
wip-hugo/routines/line/line.s
View file

@ -10,7 +10,7 @@
STA dx
BCC dx_no_underflow;; X_end >= X_pos
EOR #$ff ; Fix bit underflow
dx_no_underflow:
dx_no_underflow:
SEC
LDA Y_pos
SBC Y_end

7
wip-hugo/routines/line/line_down_inv.s
View file

@ -57,8 +57,9 @@ end_selfmod:
JSR pixel_calc ;;only used first pixel. after this relative position is abused
STA byte_to_paint
INY
Sub_16 btp_mem_pos, btp_mem_pos + 1, #$01, #$00
Sub_16 btp_mem_pos, btp_mem_pos + 1, #$00, #$00, !
LDX dy
CLC
for_y:
LDA byte_to_paint
ORA (btp_mem_pos), Y
@ -68,7 +69,7 @@ increment_y_pos:
BNE increment_y_pos_end
move_8px_down:
LDY #$08
Sub_16 btp_mem_pos, btp_mem_pos + 1, #$40 ,#$01
Sub_16 btp_mem_pos, btp_mem_pos + 1, #$3f ,#$01, !
increment_y_pos_end:
DEX
;CPX Y_end
@ -80,8 +81,8 @@ increment_pixel_x:
ASL byte_to_paint
BCC for_y
move_8px_left:
ROL byte_to_paint
Sub_16 btp_mem_pos, btp_mem_pos + 1, #$08, #$00
ROL byte_to_paint
JMP for_y
case_2:
Add_16 D, D + 1, #>dx_2, #<dx_2, ! ;D = D + 2*dx

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

@ -53,7 +53,7 @@ selfmod:
end_selfmod:
JSR pixel_calc ;;only used first pixel. after this relative position is abused
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, #$00, #$00, !
;LDY #$01
INY
LDX dx

5
wip-hugo/routines/line/line_up_inv.s
View file

@ -53,8 +53,8 @@ end_selfmod:
JSR pixel_calc ;;only used first pixel. after this relative position is abused
STA byte_to_paint
INY
Sub_16 btp_mem_pos, btp_mem_pos + 1, #$01, #$00 ;; Y has always a offset of at least 1
;LDY #$00
Sub_16 btp_mem_pos, btp_mem_pos + 1, #$00, #$00,!
CLC
LDX dy
for_y:
LDA byte_to_paint
@ -65,6 +65,7 @@ decrement_y_pos:
BNE decrement_y_pos_end
move_8px_up:
LDY #$08
; C=0
Sub_16 btp_mem_pos, btp_mem_pos + 1,#$3F , #$01, !
decrement_y_pos_end:
DEX

18
wip-hugo/source.s
View file

@ -8,17 +8,17 @@
.include "STARTUP.s"
;.include "dubbel_buffer/raster_irqs.s"
;.include "routines/arithmatic/mult_test.s"
;.include "routines/arithmatic/div_test.s"
;.include "routines/circle/circle_test.s"
;.include "routines/circle/circle_test_size.s"
;.include "routines/circle/circle_test_position.s"
.include "routines/arithmatic/mult_test.s"
.include "routines/arithmatic/div_test.s"
.include "routines/circle/circle_test.s"
.include "routines/circle/circle_test_size.s"
.include "routines/circle/circle_test_position.s"
.include "routines/line/line_test.s"
.include "routines/line/line_test_extensive.s"
;.include "routines/text/char_draw_test.s"
;.include "routines/pixel/pixel_test.s"
;.include "routines/memory/memcpy_test.s"
;.include "routines/memory/memset_test.s"
.include "routines/text/char_draw_test.s"
.include "routines/pixel/pixel_test.s"
.include "routines/memory/memcpy_test.s"
.include "routines/memory/memset_test.s"
;.include "routines/triangle/triangle_test.s"
exit: