Redused number of instructions but to small a diffrence to messure with current test
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9694d8d55b
commit
ecc138f2bc
2 changed files with 13 additions and 18 deletions
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@ -48,18 +48,13 @@
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Add_16 >D, <D, #$ff, #$01, !
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Sub_16 >D, <D, dx, #$00
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start_paint:
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LDY #$00
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jsr pixel_draw ;;only used first pixel. after this relative position is abused
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;byte_to_paint = $FE ;Byte with one 1 that corasponds to a pixel.
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;btp_mem_pos =$494A; byte to paint memory position ;Position of byte on screen
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jmp increment_x_pos_end
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for_x:
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;; Lets increment btp_mem_pos with +8
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;; Read more in pixel_draw to understand this!
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increment_x_pos:
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INC X_pos;; legacy
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increment_pixel_x:
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CLC
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LDA byte_to_paint
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ROR byte_to_paint
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@ -67,14 +62,15 @@ increment_x_pos:
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ORA (>btp_mem_pos, X)
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STA (>btp_mem_pos, X)
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BCS move_8px_left
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jmp increment_x_pos_end
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jmp increment_pixel_x_end
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move_8px_left:
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;; add +8 to btp_mem_pos. Find more of why in pixel_draw
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Add_16 >btp_mem_pos, <btp_mem_pos, #$08, #$00
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;; reset byte_to_paint
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LDA #%10000000
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STA byte_to_paint
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increment_x_pos_end:
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increment_pixel_x_end:
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INC X_pos;; legacy
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LDX X_pos
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CPX X_end
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BEQ end
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@ -82,9 +78,8 @@ increment_x_pos_end:
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;;else case 1.
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Lag_16 >D, <D, #$00, #$02, case_2
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case_1:; C =1 so we can use !
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Sub_16 >D, <D, >V, <V ; D = D - V
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Sub_16 >D, <D, >V, <V, ! ; D = D - V
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increment_y_pos:
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INC Y_pos
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Add_16 >btp_mem_pos, <btp_mem_pos, #$01, #$00
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INY
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CPY #$08 ;
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@ -96,7 +91,7 @@ move_8px_down:
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Add_16 >btp_mem_pos, <btp_mem_pos,#$38 , #$01
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jmp for_x
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case_2: ;; C =0 because LAG_16 so we can use !
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Add_16 >D, <D, >dy_2, <dy_2 ;D = D + 2*dy
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Add_16 >D, <D, >dy_2, <dy_2, ! ;D = D + 2*dy
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JMP for_x
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end:
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RTS
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@ -15,7 +15,7 @@
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;;Store pixel in byte_to_paint
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LDA #%10000000
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INX
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@shift_btp:
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@shift_btp: ;; check out SMB instruction here! //Hugo
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DEX
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BEQ end__;X=0 end this
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CLC
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