mirror of
https://github.com/lscharen/iigs-game-engine.git
synced 2024-11-22 11:34:14 +00:00
Streamline restore BG0; experiment with more aggressive inlining
This commit is contained in:
Lucas Scharenbroich
parent
0f920acd03
commit
fa731f4b2d
@ -20,6 +20,7 @@ _RestoreBG0Opcodes
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:lines_left_x2 equ tmp2
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:draw_count_x2 equ tmp3
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:exit_offset equ tmp4
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:stk_save equ tmp5
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phb ; Save data bank
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@ -33,16 +34,17 @@ _RestoreBG0Opcodes
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lda LastPatchOffset ; If zero, there are no saved opcodes
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sta :exit_offset
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ldx :virt_line_x2
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tsc
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sta :stk_save
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:loop
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ldx :virt_line_x2
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ldal BTableLow,x ; Get the address of the first code field line
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tay
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sep #$20
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ldal BTableHigh,x
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ldal BTableHigh,x ; This intentionally leaks one byte on the stack
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pha
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plb ; This is the bank that will receive the updates
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rep #$20
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txa ; lda :virt_line_x2
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and #$001E
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@ -54,18 +56,15 @@ _RestoreBG0Opcodes
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; y is already set to :base_address
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tax ; :draw_count * 2
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clc
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adc :virt_line_x2
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sta :virt_line_x2
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tya
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clc
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adc :exit_offset ; Add some offsets to get the base address in the code field line
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jsr (RestoreOpcode,x)
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lda :virt_line_x2 ; advance to the virtual line after the segment we just
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clc ; filled in
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adc :draw_count_x2
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sta :virt_line_x2
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tax
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jmp (:tgt,x)
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:tgt RestoreOpcode
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lda :lines_left_x2 ; subtract the number of lines we just completed
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sec
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@ -73,9 +72,11 @@ _RestoreBG0Opcodes
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sta :lines_left_x2
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jne :loop
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stz LastPatchOffset ; Clear the value once completed
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:out
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lda :stk_save
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tcs
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plb
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rts
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@ -318,7 +319,7 @@ _ApplyBG0XPos
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; y is already set to :base_address
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tax ; :draw_count_x2
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clc ; advance to the virtual line after the segment we just
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adc :virt_line_x2 ; filled in
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adc :virt_line_x2 ; filled in
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sta :virt_line_x2
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lda :exit_address ; Save from this location
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@ -334,14 +335,12 @@ _ApplyBG0XPos
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sep #$20
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; ldx :draw_count_x2
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lda :entry_offset
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ldy :base_address
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jsr (SetCodeEntry,x) ; All registers are preserved
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; Now, patch in the opcode
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; ldx :draw_count_x2
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lda :opcode
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jsr (SetCodeEntryOpcode,x) ; All registers are preserved
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@ -350,12 +349,7 @@ _ApplyBG0XPos
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lda :odd_entry_offset
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beq :not_odd
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; NOTE: SetOddCodeEntry and SaveHighOperand can probably be combined to eliminate call/return overhead
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; ldx :draw_count_x2
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jsr (SetOddCodeEntry,x) ; All registers are preserved
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; ldx :draw_count_x2
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jmp (:SaveHighOperand,x) ; Only used once, so "inline" it
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:save_high_op_rtn
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@ -544,77 +538,78 @@ SaveOpcode
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; X = number of lines * 2, 0 to 32
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; Y = starting line * $1000
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; A = code field location * $1000
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RestoreOpcode
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da :bottom
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da :do01,:do02,:do03,:do04
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da :do05,:do06,:do07,:do08
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da :do09,:do10,:do11,:do12
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da :do13,:do14,:do15,:do16
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RestoreOpcode mac
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da bottom
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da do01,do02,do03,do04
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da do05,do06,do07,do08
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da do09,do10,do11,do12
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da do13,do14,do15,do16
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:do15 tax
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bra :x15
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:do14 tax
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bra :x14
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:do13 tax
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bra :x13
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:do12 tax
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bra :x12
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:do11 tax
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bra :x11
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:do10 tax
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bra :x10
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:do09 tax
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bra :x09
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:do08 tax
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bra :x08
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:do07 tax
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bra :x07
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:do06 tax
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bra :x06
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:do05 tax
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bra :x05
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:do04 tax
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bra :x04
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:do03 tax
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bra :x03
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:do02 tax
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bra :x02
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:do01 tax
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bra :x01
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:do16 tax
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:x16 lda OPCODE_SAVE+$F000,y
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do15 tax
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bra x15
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do14 tax
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bra x14
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do13 tax
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bra x13
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do12 tax
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bra x12
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do11 tax
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bra x11
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do10 tax
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bra x10
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do09 tax
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bra x09
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do08 tax
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bra x08
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do07 tax
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bra x07
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do06 tax
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bra x06
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do05 tax
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bra x05
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do04 tax
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bra x04
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do03 tax
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bra x03
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do02 tax
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bra x02
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do01 tax
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bra x01
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do16 tax
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x16 lda OPCODE_SAVE+$F000,y
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sta $F000,x
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:x15 lda OPCODE_SAVE+$E000,y
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x15 lda OPCODE_SAVE+$E000,y
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sta $E000,x
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:x14 lda OPCODE_SAVE+$D000,y
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x14 lda OPCODE_SAVE+$D000,y
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sta $D000,x
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:x13 lda OPCODE_SAVE+$C000,y
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x13 lda OPCODE_SAVE+$C000,y
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sta $C000,x
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:x12 lda OPCODE_SAVE+$B000,y
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x12 lda OPCODE_SAVE+$B000,y
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sta $B000,x
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:x11 lda OPCODE_SAVE+$A000,y
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x11 lda OPCODE_SAVE+$A000,y
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sta $A000,x
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:x10 lda OPCODE_SAVE+$9000,y
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x10 lda OPCODE_SAVE+$9000,y
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sta $9000,x
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:x09 lda OPCODE_SAVE+$8000,y
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x09 lda OPCODE_SAVE+$8000,y
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sta $8000,x
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:x08 lda OPCODE_SAVE+$7000,y
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x08 lda OPCODE_SAVE+$7000,y
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sta $7000,x
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:x07 lda OPCODE_SAVE+$6000,y
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x07 lda OPCODE_SAVE+$6000,y
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sta $6000,x
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:x06 lda OPCODE_SAVE+$5000,y
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x06 lda OPCODE_SAVE+$5000,y
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sta $5000,x
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:x05 lda OPCODE_SAVE+$4000,y
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x05 lda OPCODE_SAVE+$4000,y
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sta $4000,x
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:x04 lda OPCODE_SAVE+$3000,y
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x04 lda OPCODE_SAVE+$3000,y
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sta $3000,x
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:x03 lda OPCODE_SAVE+$2000,y
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x03 lda OPCODE_SAVE+$2000,y
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sta $2000,x
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:x02 lda OPCODE_SAVE+$1000,y
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x02 lda OPCODE_SAVE+$1000,y
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sta $1000,x
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:x01 lda: OPCODE_SAVE+$0000,y
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x01 lda: OPCODE_SAVE+$0000,y
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sta: $0000,x
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:bottom rts
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bottom
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<<<
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; SetCodeEntry
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;
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