55 lines
883 B
ArmAsm
55 lines
883 B
ArmAsm
; special case
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;=========================================================
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; hgr copy from $A000/$8000 to current DRAW_PAGE
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;=========================================================
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; would be faster if we unroll it, but much bigger
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; old numbers
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; 14+ ((14*256)+20)*32 + 5 = 115347 = 8.6fps
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; theoretical unrolled, 30*6 bytes bigger (180 bytes?)
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; 2 + ((9*32)+5)*256 + 5 = 75015 = 13.3 fps
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hgr_copy:
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; copy from in A ($80/$A0)
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sta hgr_copy_smc+2 ; 4
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clc
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adc #$20
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sta hgr_copy_end_smc+1
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; lda #$A0 ; 2
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ldx #0 ; 2
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lda DRAW_PAGE
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clc
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adc #$20
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sta hgr_copy_smc+5 ; 4
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hgr_copy_column:
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hgr_copy_smc:
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lda $8000,X ; 4
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sta $2000,X ; 5
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dex ; 2
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bne hgr_copy_column ; 2nt/3t
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inc hgr_copy_smc+2 ; 6
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inc hgr_copy_smc+5 ; 6
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lda hgr_copy_smc+2 ; 4
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hgr_copy_end_smc:
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cmp #$C0 ; 2
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bne hgr_copy_column ; 2/3
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rts ; 6
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