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https://github.com/a2-4am/4cade.git
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shave some bytes
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4am
parent
e8c4291e4f
commit
aad03349e5
@ -67,11 +67,15 @@
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; 1F |FFFFFFF|FFFFFFF|FFFFFFF|FFFFFFF|FFFFFFF
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;
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!ifndef USES_CLEAR {
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USES_CLEAR = 1
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}
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src = $00 ; [word][must be at $00] used by drawing routines
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dst = $02 ; [word] used by drawing routines
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box = $04 ; [byte] counter in main loop
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rowcount = $05 ; [byte] used by drawing routines
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any = $0D ; [byte][must be at $0D] counter in main loop
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rowcount = $04 ; [byte] used by drawing routines
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box = $0E ; [byte] counter in main loop
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any = $0F ; [byte][must be at $0F] counter in main loop
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BoxStages = $10 ; [$30 bytes] current stage for each box
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hgrhi = $40 ; [$C0 bytes] HGR base addresses
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hgrlo = $300 ; [$C0 bytes] HGR base addresses
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@ -190,10 +194,11 @@ k_right_mask = 17
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; X=0 here
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+BUILD_HGR_LOOKUP_TABLES_X_IS_ALREADY_0 hgrlo, hgrhi
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; any (zero page $0D) was initialized by the BoxStages copy loop
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; any was initialized by the BoxStages copy loop
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MainLoop ldx #48
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BoxLoop stx box
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ldy BoxStages-1, x ; for each box, get its current stage
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inc BoxStages-1, x ; increment every box's stage every time through the loop
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lda StagesHi, y
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beq NextBox ; if stage's drawing routine is 0, nothing to do
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sta j+2
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@ -204,109 +209,14 @@ BoxLoop stx box
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clc
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j jsr $FD00 ; [SMC] call drawing routine for this stage
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ldx box
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NextBox inc BoxStages-1, x ; increment every box's stage every time through the loop,
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; even if we didn't call a drawing routine
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dex
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NextBox dex
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bne BoxLoop
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lda any
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beq + ; if we didn't draw anything in any box, we're done
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stx any ; X=0 here
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bit $C000
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bpl MainLoop
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+ rts
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GenerateStages
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; copy codegen data to zero page
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; X=0 here
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- lda CODEGEN_COPY_START, x
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sta $00, x
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inx
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bne -
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; generate drawing routines for copy01, then copy00
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jsr GenerateStage1And0
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; A=0 here
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sta <FIRST_ROW
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; generate drawing routines for copy0F..copy02, then clear0F..clear02
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lda #<MIDDLE_STAGE
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--- eor #(<OUTER_STAGE XOR <MIDDLE_STAGE)
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sta <codegen_token_src
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ldx #6
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-- stx <codegen_maskindex
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lda <EdgeLeftMasks, x
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sta <EDGE_LEFT_MASK
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lda <EdgeRightMasks, x
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sta <EDGE_RIGHT_MASK
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lda <LeftMasks, x
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sta <LEFT_MASK
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lda <RightMasks, x
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sta <RIGHT_MASK
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jsr BuildDrawingRoutine
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dec <ROW_COUNT
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dec <ROW_COUNT
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inc <FIRST_ROW
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dec <codegen_stage
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bmi GenerateStage1And0
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lda <codegen_stage
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eor #13
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bne +
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; reset counts and switch from copy to clear
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sta <FIRST_ROW
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lda #$1F
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sta <ROW_COUNT
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lda #$A9
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sta <COPY
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lda #$24
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sta <BIT_FOR_CLEAR
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+ lda <codegen_token_src
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ldx <codegen_maskindex
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dex
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bmi ---
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bpl -- ; always branches
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; generate drawing routines for clear01, then clear00, then exit
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GenerateStage1And0
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lda #%10111110
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sta <LEFT_MASK
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lda #<STAGE1
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jsr BuildDrawingRoutineFrom
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inc <FIRST_ROW
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lda #<STAGE0
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+HIDE_NEXT_2_BYTES
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; execution falls through here
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BuildDrawingRoutine
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lda <codegen_token_src
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; execution falls through here
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BuildDrawingRoutineFrom
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sta <codegen_token_src
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ldy #0
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sty <codegen_token_x
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@tokenLoop
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jsr codegen_get_next_token
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pha
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tax
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lda <codegen_piece_lengths, x
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sta @length
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lda <codegen_pieces, x
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sta @src
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ldx #0
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@pieceLoop
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@src=*+1
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lda $FD, x ; SMC
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jsr codegen_store_byte
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iny
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inx
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@length=*+1
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cpx #$FD ; SMC
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bcc @pieceLoop
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pla
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bne @tokenLoop
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dec <codegen_dst
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; execution falls through here
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+
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CODEGEN_COPY_START
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!pseudopc 0 {
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RTS0 ; 1 byte
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@ -497,19 +407,106 @@ codegen_stage
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!byte 27
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codegen_maskindex
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!byte 0
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codegen_get_next_token
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BuildDrawingRoutineFrom
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sta <codegen_token_src
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BuildDrawingRoutine
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ldy #0
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sty <codegen_token_x
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BuildTokenLoop
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codegen_token_x=*+1
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ldx #$00
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codegen_token_src=*+1
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lda <OUTER_STAGE, x
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inc <codegen_token_x
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rts
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codegen_store_byte
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pha
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tax
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lda <codegen_piece_lengths, x
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sta <piece_length
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lda <codegen_pieces, x
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sta <piece_src
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ldx #0
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BuildPieceLoop
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piece_src=*+1
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lda $FD, x ; SMC
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!byte $99,$00 ; STA $4400, Y
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; note: this 0 byte is later copied to zero page $0D (any) and used in MainLoop
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codegen_dst
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!byte copy01
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iny
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inx
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piece_length=*+1
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cpx #$FD ; SMC
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bcc BuildPieceLoop
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pla
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bne BuildTokenLoop
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dec <codegen_dst
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inc <FIRST_ROW
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rts
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}
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GenerateStages
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; copy codegen data to zero page
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; X=0 here
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- lda CODEGEN_COPY_START, x
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sta $00, x
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inx
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bne -
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; generate drawing routines for copy01, then copy00
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jsr GenerateStage1And0
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; A=0 here
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sta <FIRST_ROW
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; generate drawing routines for copy0F..copy02, then clear0F..clear02
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lda #<MIDDLE_STAGE
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--- eor #(<OUTER_STAGE XOR <MIDDLE_STAGE)
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sta <codegen_token_src
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ldx #6
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-- stx <codegen_maskindex
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lda <EdgeLeftMasks, x
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sta <EDGE_LEFT_MASK
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lda <EdgeRightMasks, x
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sta <EDGE_RIGHT_MASK
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lda <LeftMasks, x
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sta <LEFT_MASK
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lda <RightMasks, x
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sta <RIGHT_MASK
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jsr BuildDrawingRoutine
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dec <ROW_COUNT
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dec <ROW_COUNT
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dec <codegen_stage
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bmi GenerateStage1And0
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lda <codegen_stage
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eor #13
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bne +
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!if USES_CLEAR {
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; reset counts and switch from copy to clear
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sta <FIRST_ROW
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lda #$1F
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sta <ROW_COUNT
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lda #$A9
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sta <COPY
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lda #$24
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sta <BIT_FOR_CLEAR
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} else {
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rts
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}
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+ lda <codegen_token_src
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ldx <codegen_maskindex
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dex
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bmi ---
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bpl -- ; always branches
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; generate drawing routines for clear01, then clear00, then exit
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GenerateStage1And0
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lda #%10111110
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sta <LEFT_MASK
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lda #<STAGE1
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jsr BuildDrawingRoutineFrom
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lda #<STAGE0
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jmp BuildDrawingRoutineFrom
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; note: the high byte of the final JMP is later copied
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; to zero page $0F and used in MainLoop, so don't put any
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; more code before BoxInitialStages
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BoxInitialStages
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