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unroll loop for faster char-draw:s

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hugova 2025-05-15 17:24:40 +02:00
parent 98ef4eaef0
commit c1a79b32b7
2 changed files with 21 additions and 6 deletions
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23
wip-hugo/routines/text/char_draw.s
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@ -51,14 +51,29 @@ calculate_screen_position:
Add_16 screen_position, screen_position + 1, A, #$00 Add_16 screen_position, screen_position + 1, A, #$00
move_data: move_data:
;; One character is 8 byte, move these bytes to screen ;; One character is 8 byte, move these bytes to screen
LDY #$07 LDY #$07
@loop:
LDA (petski_position), Y LDA (petski_position), Y
STA (screen_position), Y STA (screen_position), Y
DEY DEY ;$06
BNE @loop LDA (petski_position), Y
STA (screen_position), Y
DEY ;$05
LDA (petski_position), Y
STA (screen_position), Y
DEY ;$04
LDA (petski_position), Y
STA (screen_position), Y
DEY ;$03
LDA (petski_position), Y
STA (screen_position), Y
DEY ;$02
LDA (petski_position), Y
STA (screen_position), Y
DEY ;$01
LDA (petski_position), Y
STA (screen_position), Y
DEY ;$00
LDA (petski_position), Y LDA (petski_position), Y
STA (screen_position), Y STA (screen_position), Y
RTS RTS

4
wip-hugo/source.s
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@ -9,10 +9,10 @@
;.include "dubbel_buffer/raster_irqs.s" ;.include "dubbel_buffer/raster_irqs.s"
.include "routines/line/line_test.s" .include "routines/line/line_test.s"
;.include "routines/text/char_draw_test.s" .include "routines/text/char_draw_test.s"
;.include "routines/pixel/pixel_test.s" ;.include "routines/pixel/pixel_test.s"
;.include "routines/memory/memcpy_test.s" ;.include "routines/memory/memcpy_test.s"
.include "routines/memory/memset_test.s" ;.include "routines/memory/memset_test.s"
;.include "routines/triangle/triangle_test.s" ;.include "routines/triangle/triangle_test.s"
exit: exit:
JMP exit JMP exit