Stacken/c64-livecoding
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optimise away constant by adding it to lookup-table

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hugova 2025-05-12 02:24:55 +02:00
parent d34d25ce9f
commit 55e63ff627
2 changed files with 53 additions and 52 deletions
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101
wip-hugo/END.s
View file

@ -1,55 +1,56 @@
binary_factor:
.byte %00000001, %00000010, %00000100, %00001000, %00010000, %00100000, %01000000, %10000000
Bitmap = $4000
;;This is used by pixel_draw! look at it for more detail
big_y_offset:
.lobytes $0000
.hibytes $0000
.lobytes $0140
.hibytes $0140
.lobytes $0280
.hibytes $0280
.lobytes $03C0
.hibytes $03C0
.lobytes $0500
.hibytes $0500
.lobytes $0640
.hibytes $0640
.lobytes $0780
.hibytes $0780
.lobytes $08C0
.hibytes $08C0
.lobytes $0A00
.hibytes $0A00
.lobytes $0B40
.hibytes $0B40
.lobytes $0C80
.hibytes $0C80
.lobytes $0DC0
.hibytes $0DC0
.lobytes $0F00
.hibytes $0F00
.lobytes $1040
.hibytes $1040
.lobytes $1180
.hibytes $1180
.lobytes $12C0
.hibytes $12C0
.lobytes $1400
.hibytes $1400
.lobytes $1540
.hibytes $1540
.lobytes $1680
.hibytes $1680
.lobytes $17C0
.hibytes $17C0
.lobytes $1900
.hibytes $1900
.lobytes $1A40
.hibytes $1A40
.lobytes $1B80
.hibytes $1B80
.lobytes $1CC0
.hibytes $1CC0
.lobytes $1E00
.hibytes $1E00
.lobytes $0000 + Bitmap
.hibytes $0000 + Bitmap
.lobytes $0140 + Bitmap
.hibytes $0140 + Bitmap
.lobytes $0280 + Bitmap
.hibytes $0280 + Bitmap
.lobytes $03C0 + Bitmap
.hibytes $03C0 + Bitmap
.lobytes $0500 + Bitmap
.hibytes $0500 + Bitmap
.lobytes $0640 + Bitmap
.hibytes $0640 + Bitmap
.lobytes $0780 + Bitmap
.hibytes $0780 + Bitmap
.lobytes $08C0 + Bitmap
.hibytes $08C0 + Bitmap
.lobytes $0A00 + Bitmap
.hibytes $0A00 + Bitmap
.lobytes $0B40 + Bitmap
.hibytes $0B40 + Bitmap
.lobytes $0C80 + Bitmap
.hibytes $0C80 + Bitmap
.lobytes $0DC0 + Bitmap
.hibytes $0DC0 + Bitmap
.lobytes $0F00 + Bitmap
.hibytes $0F00 + Bitmap
.lobytes $1040 + Bitmap
.hibytes $1040 + Bitmap
.lobytes $1180 + Bitmap
.hibytes $1180 + Bitmap
.lobytes $12C0 + Bitmap
.hibytes $12C0 + Bitmap
.lobytes $1400 + Bitmap
.hibytes $1400 + Bitmap
.lobytes $1540 + Bitmap
.hibytes $1540 + Bitmap
.lobytes $1680 + Bitmap
.hibytes $1680 + Bitmap
.lobytes $17C0 + Bitmap
.hibytes $17C0 + Bitmap
.lobytes $1900 + Bitmap
.hibytes $1900 + Bitmap
.lobytes $1A40 + Bitmap
.hibytes $1A40 + Bitmap
.lobytes $1B80 + Bitmap
.hibytes $1B80 + Bitmap
.lobytes $1CC0 + Bitmap
.hibytes $1CC0 + Bitmap
.lobytes $1E00 + Bitmap
.hibytes $1E00 + Bitmap

4
wip-hugo/routines/pixel/pixel_draw.s
View file

@ -31,7 +31,7 @@ calc_byte_to_paint:
;; the chunks are orderd from the left to the right and then looping downwards.
;; Therefore we have that: btp_mem_pos = big_x_offset + smal_y_offset + big_y_offset + bitmap_offset
;; We use a lookup-table for big_y_offset (see END.s)
;; We use a lookup-table for big_y_offset + bitmap_offset (see END.s)
;; (Y_pos / 8 floor)*2
LDA Y_pos
LSR A
@ -57,7 +57,7 @@ calc_byte_to_paint:
AND Y_pos ;; offset to add
TAY
Add_16 btp_mem_pos, btp_mem_pos + 1, #<Bitmap, #>Bitmap, !
;Add_16 btp_mem_pos, btp_mem_pos + 1, #<Bitmap, #>Bitmap, !
;;Let draw some stuff
LDA byte_to_paint ;; note that both bytes are used!